A clustered grouting corrugated pipe assembly pier connected to a prefabricated cap and a construction method thereof

Abstract

The present invention provides a cluster grouting corrugated pipe assembly pier connected to a prefabricated cap and a construction method. The assembled bridge pier includes a foundation, a pier column segment and a top cap segment. The foundation is connected by a foundation prefabricated segment through a foundation connection seam. The top surface of the foundation prefabricated segment and the prefabricated pier column segment is pre-embedded with connecting steel bars. The bottom surface of the corresponding prefabricated pier column segment and the prefabricated top cap segment is pre-embedded with a cluster connection corrugated pipe. The pre-embedded connecting steel bars are inserted into the cluster connection corrugated pipe and then high-strength grouting material is poured. The top cap connection section and the top cap segment are connected through a top cap splicing seam, and then the connecting steel plates are welded to each other. The steel strand is passed through the pre-embedded corrugated pipe embedded in each segment, and a U-shaped arrangement is adopted. The steel strand is tensioned on the top of the top cap, and then the foundation connection seam is constructed and concrete is poured to complete the assembly. The cluster arrangement of the connecting steel bars of the assembled bridge pier has a large construction tolerance, low construction accuracy requirements, low assembly difficulty, high grouting efficiency, fast assembly between top cap segments, convenient prestressing installation, and low cost.

Description

Technical Field

[0001] The invention belongs to the field of bridge structure construction, and in particular relates to a clustered grouting corrugated pipe assembly pier connected to a prefabricated cap and a construction method. Background Art

[0002] The construction of prefabricated assembled bridge piers is a very important part of promoting the industrial development of bridge engineering. It has the advantages of small construction interference, fast construction speed, good engineering quality, and low labor costs. In recent years, it has been applied in many projects in the fields of domestic municipal engineering and highway engineering. The frame pier consists of pier columns and top caps. The prefabricated pier columns and foundations, prefabricated top caps and prefabricated pier columns are assembled. It is often used to cross road interchanges and other construction sites. The joint connection form often adopts sleeve grouting connection or corrugated pipe connection.

[0003] Sleeve grouting or corrugated pipe connection requires reserving steel bar joints in the prefabricated segment, and then connecting the steel bars one by one. The steel bars of sleeve grouting connection must be inserted into the sleeve for a certain length to ensure the safety of the joint connection. Improving the safety of the joint requires increasing the sleeve length. At present, the cost of grouting sleeves is very high, and further increasing the cost will significantly increase the cost; sleeve grouting or corrugated pipe connection requires high construction accuracy, and the allowable deviation of the length and position of the steel bar joints is small; during construction, the steel bar joints need to be inserted into the sleeve or corrugated pipe one by one, especially there are many steel bar joints between the top cap and the pier column, and the construction alignment is difficult; after the steel bar connection is completed, grouting operations need to be carried out one by one, and there are many processes; the cost of grouting sleeves is very high, which is not conducive to the application and promotion of engineering scale. At the same time, when the frame pier uses multiple small segments, there are multiple splicing seams, and the connection and installation between multiple small segments directly affect the assembly efficiency and quality of the overall structure; when the frame pier needs prestressed connection, it is often difficult to install steel strands or thick steel bars.

[0004] In view of the shortcomings of the existing connection method, it is an urgent problem to develop a clustered grouting corrugated pipe assembly pier connected to a prefabricated cap and a construction method. Summary of the invention

[0005] In view of this, the present invention aims to propose a clustered grouting corrugated pipe assembly pier connected to a prefabricated cap and a construction method, which has a large construction tolerance, low construction accuracy requirements and a fast construction speed.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A cluster grouting corrugated pipe assembly pier connected to a prefabricated cap comprises a foundation, a pier column segment and a top cap, wherein the top cap comprises a top cap connecting segment and two top cap segments, a top cap connecting key is provided on the end surface of the top cap segment, a pre-embedded steel plate 1 is pre-embedded on the outside of the top cap connecting key, top cap connecting grooves are provided on both side end surfaces of the top cap connecting segment, the top cap connecting grooves match the top cap connecting keys, pre-embedded steel plates 2 are pre-embedded on both sides of the top cap connecting segment, the top cap connecting segment is connected to the top cap segment through a top cap splicing seam, and then the pre-embedded steel plates 1 and 2 are welded to each other; the foundation is formed by connecting two foundation prefabricated segments through a foundation connecting seam. The prefabricated foundation segment is pre-embedded with connecting steel bars or bundled connecting corrugated pipes, the pier segment is pre-embedded with connecting steel bars at one end and the other end, the top cap segment is pre-embedded with bundled connecting corrugated pipes or connecting steel bars, and the bundled connecting corrugated pipes correspond to the connecting steel bars one by one; the pre-embedded connecting steel bars are inserted into the bundled connecting corrugated pipes, and then high-strength grouting material is poured, the steel strands are passed through the pre-embedded corrugated pipes embedded in the top cap segment, the pier segment and the prefabricated foundation segment, the steel strands are tensioned at the top of the top cap segment, the foundation connecting seam is constructed, and concrete is poured into the two prefabricated foundation segments to complete the assembly of the bridge piers.

[0008] Furthermore, the foundation prefabricated segment is a hollow square box prefabricated in a factory, one side of the box is open, and the openings of the two foundation prefabricated segment boxes are arranged opposite to each other. Embedded steel bars are arranged on the end faces of the openings of the foundation prefabricated segment boxes, and the embedded steel bars extend out of the end faces by a certain length. The embedded steel bars are connected to each other through foundation connecting steel bars, and the foundation connecting seams are cast between the openings of the foundation prefabricated segment boxes to achieve connection between the embedded steel bars. A pile foundation reserved hole is provided on the bottom plate of the foundation prefabricated segment, and the size is larger than that of the pile foundation and the pile foundation steel bars. During construction, the pile foundation and the pile foundation steel bars are inserted into the pile foundation reserved hole, and then poured with concrete to anchor the pile foundation steel bars to achieve connection between the foundation and the pile foundation.

[0009] Furthermore, the connecting steel bars are embedded in the foundation and pier segments and extend a certain length from the top surface of the foundation and pier segments. They are composed of three or more ordinary steel bars, arranged in a circular or rectangular pattern, and arranged in a steel bar bundle. The number of connecting steel bars is reduced without reducing the number of steel bars, which is convenient for connecting and grouting steel bars between segments. Stirrups are tied to ordinary steel bars to increase the integrity of the connecting steel bars, and the connecting steel bars extending from the top surface have a certain rigidity to ensure that the connecting steel bars are vertical.

[0010] Furthermore, the bundled connecting corrugated pipe is embedded in the bottom surface of the pier column segment and the top cap segment, corresponding to the connecting steel bars one by one, and is circular or rectangular in shape, 3-5 cm larger than one side of the connecting steel bar, and about 2 cm longer than the connecting steel bar, so as to facilitate the insertion of the connecting steel bar, and is provided with a grouting hole. The bundled connecting corrugated pipe is embedded in the inner side of the pier column steel bar, arranged along the circumference of the pier column segment, and connected to the pier column steel bar.

[0011] Furthermore, spiral reinforcement is arranged around the cluster connection corrugated pipe, and the spiral reinforcement is arranged in a spiral form. When the connecting steel bar is pulled, it can play a role in constraining the high-strength grouting material in the cluster connection corrugated pipe, thereby increasing the anchoring safety. Connected steel bars are arranged around the spiral reinforcement of the cluster connection corrugated pipe, and the connected steel bars are connected to the spiral reinforcement and extend into the pier column segment and the top cap segment for a certain length, thereby playing a role in anchoring and dispersing the force.

[0012] Furthermore, the connecting steel bars are embedded in the top cap segment and the pier segment, extending out of the bottom surface of the top cap segment and the pier segment by a certain length; the clustered connecting corrugated pipe is embedded in the pier segment and the top surface of the foundation, corresponding one-to-one with the connecting steel bars; the connecting steel bars are inserted into the clustered connecting corrugated pipe for connection; the connected steel bars on the clustered connecting corrugated pipe extend upward, so that the connecting steel bars embedded above the segment are inserted therein, and the two are overlapped by a certain length to form a connection between the two, thereby further increasing the connection strength.

[0013] Furthermore, the top cap connecting key adopts a convex structure, the embedded steel plate 1 adopts an annular steel plate, the outer contour of which is flush with the end face of the top cap segment, and is anchored to the top cap segment by anchor bar 1, the top cap connecting groove adopts a concave structure, the embedded steel plate 2 adopts an annular steel plate, which is arranged around the end face of the top cap connecting section, and is anchored to the top cap connecting section by anchor bar 2, the two ends of the embedded steel plate extend out of the top cap connecting section by a certain length, and the embedded steel plate 2 and the embedded steel plate 1 are connected by a fillet weld, thereby realizing the connection between the top cap connecting section and the top cap segment.

[0014] Furthermore, the embedded corrugated pipe is embedded in the corresponding positions of the top cap segment, the pier segment and the prefabricated foundation segment, and is arranged in a U-shape. After the assembly between the segments is completed, the steel strand is inserted into the embedded corrugated pipe from top to bottom, and then the steel strand is arranged in a U-shape and inserted into the corresponding pre-embedded corrugated pipe from bottom to top. The steel strand anchor end is set above the top cap segment, the steel strand is tensioned, and concrete is poured after the foundation is constructed.

[0015] Furthermore, the foundation and the pier column segment, the adjacent pier column segments, and the pier column segment and the top cap segment are all connected by joints, and the joints are made of high-strength mortar or ultra-high performance concrete. The top cap joints connect the top cap segment and the top cap connecting segment, and use epoxy resin glue.

[0016] Furthermore, the high-strength grouting material is poured into the bundled connection corrugated pipe. After the connecting steel bars are inserted into the bundled connection corrugated pipe, the high-strength grouting material is poured through the grouting holes. The pouring is completed when the slurry flows out. The high-strength grouting material adopts grouting material or ultra-high performance concrete to anchor and grip the bundled steel bars, thereby forming a steel bar bundle grouting connection.

[0017] A construction method for assembling piers using the above-mentioned clustered grouting corrugated pipes connected to the prefabricated cap comprises the following steps:

[0018] Step 1: The foundation prefabricated segments, pier segments, and top cap segments are prefabricated in the factory and are ready for installation;

[0019] Step 2: construct the prefabricated foundation segments and connect the embedded steel bars through the foundation connecting steel bars;

[0020] Step 3: Hoist the pier column segment, construct the splicing seam, and insert the embedded connecting steel bar into the bundled connecting corrugated pipe; hoist the top cap segment on one side, construct the splicing seam, and insert the embedded connecting steel bar into the bundled connecting corrugated pipe;

[0021] Step 4: Hoist the top cap connection section, connect it with the top cap segment through the top cap joint, and then weld the second embedded steel plate with the first embedded steel plate; hoist the top cap segment on the other side, construct the joint, insert the embedded connecting steel bar into the bundled connecting corrugated pipe, and assemble it with the top cap connection section in the same way;

[0022] Step 5: Pour high-strength grouting material into the bundled connection corrugated pipe to achieve connection between steel bars;

[0023] Step 6: Pass the steel strand through the pre-buried corrugated pipe embedded in the top cap segment, pier segment and prefabricated foundation segment, and then pass it back to the top of the top cap segment in a U-shaped arrangement. Tension the steel strand at the top of the top cap segment, construct the foundation connection joint, and then pour concrete to complete the assembly of the piers.

[0024] Compared with the prior art, the clustered grouting corrugated pipe assembly pier connected to the prefabricated cap and the construction method described in the present invention have the following advantages:

[0025] 1. By adopting the clustered arrangement of connecting steel bars, a larger gap is reserved between the clustered connecting corrugated pipe and the connecting steel bars, which results in a large construction tolerance and low construction precision requirements. The number of clustered connecting steel bars is small, which facilitates construction alignment and insertion into the reserved corrugated pipe, and reduces the difficulty of assembly construction.

[0026] 2. The connecting steel bar joint inserted into the bundled connecting corrugated pipe has a long length, and the steel bar connection and anchoring safety is high; the bundled steel bar reduces the number of pre-buried bundled connecting corrugated pipes without reducing the steel bar content, and the grouting efficiency is high and the construction speed is fast.

[0027] 3. The top cap segments can be assembled quickly, which is suitable for piers and top caps to be assembled with multiple small segments. A single segment has a small weight and size, which is easy to transport and hoist.

[0028] 4. When the segments are connected by prestressing, prestressed steel strands are used, which has high connection efficiency. By reserving tensioning space in the foundation, the problem of inconvenience in threading the prestressed tendons in the U-shaped arrangement is solved.

[0029] 5. The cost of joint connection is low, which reduces the cost of prefabricated assembled bridge piers and is conducive to promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 It is a front view of the present invention;

[0032] Figure 2 is a top view of the present invention;

[0033] Figure 3 It is a basic schematic diagram of the present invention, wherein 3-a is a front view, and 3-b is a sectional view II in 3-a;

[0034] Figure 4 It is a schematic diagram of the pier column segment in the present invention;

[0035] Figure 5 It is a schematic diagram of the top hat in the present invention;

[0036] Figure 6 6-a is a schematic diagram of a top hat segment in the present invention, wherein 6-a is a front view, and 6-b is a III-III cross-sectional view in 6-a;

[0037] Figure 7 7-a is a schematic diagram of the top cap connection section of the present invention, wherein 7-a is a front view, and 7-b is a II-II cross-sectional view in 7-a;

[0038] Figure 8 It is a schematic diagram of a prestressed connection of a clustered grouting corrugated pipe assembly pier connected to a prefabricated cap according to the present invention;

[0039] Fig. 9 It is a schematic side view of a prestressed connection of a clustered grouting corrugated pipe assembly pier connected to a prefabricated cap according to the present invention;

[0040] Fig.10 10-a is the front view of the precast foundation segment, and 10-b is the side view of the precast foundation segment;

[0041] Fig.11It is a schematic diagram of a second embodiment of a clustered grouting corrugated pipe assembled pier connected to a prefabricated cap according to the present invention.

[0042] Description of reference numerals:

[0043] 1 Foundation 101 Prefabricated foundation segment 102 Embedded steel bars 103 Foundation connecting steel bars

[0044] 104 foundation joint 105 post-cast concrete 106 pile foundation reserved hole

[0045] 107 pile foundation 108 pile foundation reinforcement

[0046] 2 joints 3 pier segments

[0047] 4 top hat segment 401 top hat connection key 402 embedded steel plate 1 403 anchor bar 1

[0048] 5Top hat connection section 501Top hat connection groove 502Embedded steel plate 2 503Anchor bar 2

[0049] 6 Cluster connection bellows 601 spiral reinforcement 602 connected steel bars

[0050] 7 Connecting steel bar 701 stirrup

[0051] 8 high-strength grouting material 9 top cap joint 10 grouting hole 11 pier column steel bar

[0052] 12 Pre-buried corrugated pipe 13 Steel strand 14 Steel strand anchor end DETAILED DESCRIPTION

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0055] 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 by specific circumstances.

[0056] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0057] like Figure 1-5 As shown, a cluster grouting corrugated pipe assembly pier connected to a prefabricated foundation comprises a foundation 1, a plurality of pier column segments 3 and a top cap, wherein the top cap comprises a top cap connecting section 5 and two top cap segments 4, a top cap connecting key 401 is arranged on the end surface of the top cap segment 4, an embedded steel plate 1 402 is embedded on the outside of the top cap connecting key 401, top cap connecting grooves 501 are arranged on both side end surfaces of the top cap connecting section 5, the top cap connecting grooves 501 match the top cap connecting keys 401, embedded steel plates 2 502 are embedded on both sides of the top cap connecting section 5, the top cap connecting section 5 is connected to the top cap segment 4 by a top cap joint seam 9, and then the embedded steel plates 1 402 and the embedded steel plates 2 502 are welded to each other; the foundation 1 consists of two The foundation prefabricated segments 101 are connected by foundation connecting seams 104. Connecting steel bars 7 are embedded in the top surfaces of the foundation prefabricated segments 101 and the pier segment 3. Clustered connecting corrugated pipes 6 are embedded in the bottom surfaces of the pier segment 3 and the top cap segment 4. The clustered connecting corrugated pipes 6 correspond to the connecting steel bars 7 one by one. The embedded connecting steel bars 7 are inserted into the clustered connecting corrugated pipes 6, and then high-strength grouting material 8 is poured. The steel strands 13 are passed through the embedded corrugated pipes 12 embedded in the top cap segment 4, the pier segment 3, and the foundation prefabricated segments 101. The steel strands 13 are tensioned at the top of the top cap segment 4, and then the foundation connecting seams 104 are constructed. Concrete 105 is poured into the two foundation prefabricated segments 101 to complete the assembly of the bridge piers.

[0058] The foundation 1 and the pier column segment 3, the adjacent pier column segments 3, and the pier column segment 3 and the top cap segment 4 are all connected by joints 2, and the joints 2 are made of high-strength mortar or ultra-high performance concrete.

[0059] like Fig.10As shown, the foundation prefabricated segment 101 is a hollow square box prefabricated in a factory, one side of the box is open, and the box openings of the two foundation prefabricated segments 101 are arranged opposite to each other. The end face of the box opening of the foundation prefabricated segment 101 is provided with embedded steel bars 102, and the embedded steel bars 102 extend out of the end face by a certain length. The embedded steel bars 102 are connected to each other through foundation connecting steel bars 103, and the foundation connecting seams 104 are cast between the box openings of the foundation prefabricated segment 101 to achieve the connection between the embedded steel bars 102. A pile foundation reserved hole 106 is provided on the bottom plate of the foundation prefabricated segment 101, and the size is larger than the pile foundation 107 and the pile foundation steel bar 108. During construction, the pile foundation 107 and the pile foundation steel bar 108 are inserted into the pile foundation reserved hole 106, and then poured with concrete 105 to anchor the pile foundation steel bar 108 to achieve the connection between the foundation 1 and the pile foundation 107.

[0060] When assembling bridge piers, it is necessary to set prestressing force. When pre-buried steel strands are used for prestressing force, it is difficult to insert the steel strands into the pre-buried channels in the segments because of their low stiffness and difficulty in ensuring verticality. When thick steel bars are used, the strength of the thick steel bars is relatively low and multiple ones need to be set, which brings inconvenience to the construction. By using a hollow box to provide working space for the steel strands, the steel strands 13 are U-shaped and bundled in the cavity of the prefabricated foundation segment 101, the problem of the inconvenience of U-shaped arrangement of the steel strands 13 is solved. After the steel strands 13 are tensioned, concrete 105 is poured into the two prefabricated foundation segments 101.

[0061] The connecting steel bar 7 is embedded in the foundation 1 and the pier column segment 3, and extends a certain length from the top surface of the foundation 1 and the pier column segment 3. It is composed of three or more ordinary steel bars, arranged in a circular or rectangular shape, and arranged in a steel bar bundle. The number of connecting steel bars 7 is reduced without reducing the number of steel bars, which is convenient for the connection and grouting of steel bars between segments. The stirrups 701 are tied to the ordinary steel bars to increase the integrity of the connecting steel bars, and the connecting steel bars extending from the top surface have a certain rigidity to ensure that the connecting steel bars are vertical.

[0062] The clustered connecting corrugated pipe 6 is pre-buried in the bottom surface of the pier column segment 3 and the top cap segment 4, corresponding to the connecting steel bar 7 one by one, and is circular or rectangular in shape, 3-5 cm larger than one side of the connecting steel bar 7, and about 2 cm longer than the connecting steel bar 7, so as to facilitate the insertion of the connecting steel bar 7, and is provided with a grouting hole 10. The clustered connecting corrugated pipe 6 is pre-buried in the inner side of the pier column steel bar 11, arranged along the circumference of the pier column segment 3, and connected to the pier column steel bar 11.

[0063] A spiral rib 601 is provided around the clustered connection bellows 6. The spiral rib 601 is arranged in a spiral form. When the connecting steel bar 7 is pulled, it can play a role in constraining the high-strength grouting material 8 in the clustered connection bellows 6, thereby increasing the anchoring safety. A connected steel bar 602 is provided around the spiral rib 601 of the clustered connection bellows 6. The connected steel bar 602 is connected to the spiral rib 601 and extends into the pier column segment 3 and the top cap segment 4 for a certain length, thereby playing a role in anchoring and dispersing the force.

[0064] like Figure 6-7 As shown, the top cap connection key 401 adopts a convex structure, the embedded steel plate 1 402 adopts an annular steel plate, the outer contour is flush with the end face of the top cap segment 4, and is anchored to the top cap segment 4 through the anchor bar 1 403, the top cap connection groove 501 adopts a concave structure, the embedded steel plate 2 502 adopts an annular steel plate, arranged around the end face of the top cap connection segment 5, and is anchored to the top cap connection segment 5 through the anchor bar 2 503, the end of the embedded steel plate 2 502 extends out of the top cap connection segment 5 by a certain length, and the embedded steel plate 2 502 is connected to the embedded steel plate 1 402 by a fillet weld, so as to realize the connection between the top cap connection segment 5 and the top cap segment 4. The top cap joint seam 9 connects the top cap segment 4 and the top cap connection segment 5, and epoxy resin glue is used.

[0065] like Figure 8-9 As shown, the embedded corrugated pipe 12 is embedded in the corresponding positions of the top cap segment 4, the pier segment 3, and the foundation prefabricated segment 101, and is arranged in a U shape. After the assembly between the segments is completed, the steel strand 13 is inserted into the embedded corrugated pipe 12 from top to bottom, and then the steel strand 13 is arranged in a U shape and inserted into the corresponding embedded corrugated pipe 12 from bottom to top. A steel strand anchoring end 14 is set above the top cap segment 4, the steel strand 13 is tensioned, and concrete 105 is poured after the foundation is constructed.

[0066] The high-strength grouting material 8 is poured into the bundled connection corrugated pipe 6. After the connecting steel bar 7 is inserted into the bundled connection corrugated pipe 6, the high-strength grouting material 8 is poured through the grouting hole 10. The pouring is completed when it flows out of the slurry. The high-strength grouting material 8 uses grouting material or ultra-high performance concrete to anchor and grip the bundled steel bars to form a steel bar bundle grouting connection. When the connecting steel bar 7 is stressed, the tension of the connecting steel bar 7 is transmitted to the high-strength grouting material 8 through the gripping force. The bundled connection corrugated pipe 6 constrains the deformation of the high-strength grouting material 8. The high-strength grouting material 8 transmits the tension to the bundled connection corrugated pipe 6 through the friction force and the restraining force of the spiral rib 601. The bundled connection corrugated pipe 6 transmits part of the tension to the outer concrete through the corrugated ribs on the corrugated pipe, and transmits part of the tension to the connected steel bar 602 through the spiral rib 601, thereby realizing a reliable connection between the connecting steel bar 7 and the connected steel bar 602.

[0067] like Fig.11As shown, another embodiment of a clustered grouting corrugated pipe assembled pier connected to a prefabricated foundation is as follows: the connecting steel bars 7 are embedded in the top cap segment 4 and the pier column segment 3, extending out of the bottom surface of the top cap segment 4 and the pier column segment 3 by a certain length; the clustered connecting corrugated pipe 6 is embedded in the top surface of the pier column segment 3 and the foundation 1, corresponding one-to-one with the connecting steel bars 7, and the connecting steel bars 7 are inserted into the clustered connecting corrugated pipe 6 for connection; the connected steel bars 602 on the clustered connecting corrugated pipe 6 extend upward, so that the connecting steel bars 7 embedded above the segment are inserted therein, and the two are overlapped by a certain length to form a connection between the two, thereby further increasing the connection strength.

[0068] A construction method for assembling piers using the above-mentioned clustered grouting corrugated pipes connected to the prefabricated cap comprises the following steps:

[0069] Step 1: The foundation prefabricated segment 101, the pier segment 3, and the top cap segment 4 are prefabricated in the factory and are ready for installation;

[0070] Step 2: construct the foundation prefabricated segment 101 and connect the embedded steel bars 102 through the foundation connecting steel bars 103;

[0071] Step 3: hoist the pier column segment 3, construct the splicing seam 2, and insert the embedded connecting steel bar 7 into the bundled connecting corrugated pipe 6; hoist the top cap segment 4 on one side, construct the splicing seam 2, and insert the embedded connecting steel bar 7 into the bundled connecting corrugated pipe 6;

[0072] Step 4: hoist the top hat connecting section 5, connect it with the top hat segment 4 through the top hat splicing seam 9, and then weld the embedded steel plate 2 502 and the embedded steel plate 1 402; hoist the top hat segment 5 on the other side, construct the splicing seam 2, insert the embedded connecting steel bar 7 into the bundled connecting corrugated pipe 6, and assemble it with the top hat connecting section 5 in the same way;

[0073] Step 5: Pour high-strength grouting material 8 into the bundled connecting corrugated pipe 6 to achieve connection between the steel bars;

[0074] Step six: Pass the steel strand 13 through the pre-buried corrugated pipe 12 embedded in the top cap segment 4, the pier segment 3, and the prefabricated foundation segment 101, and then pass it back to the top of the top cap segment 4 in a U-shaped arrangement, tension the steel strand at the top of the top cap segment 4, construct the foundation connection joint 104, and then pour concrete 105 to complete the assembly of the bridge piers.

[0075] In the cluster grouting corrugated pipe assembly pier connected to the prefabricated foundation in this technical solution, the prefabricated pier column and the prefabricated foundation, the prefabricated top cap and the prefabricated pier column are connected by steel bar cluster grouting, the connecting steel bar is arranged in a cluster, and a large gap is reserved between the cluster connection corrugated pipe and the connecting steel bar, so the construction tolerance is large and the construction precision requirement is low. The number of cluster connection steel bars is small, which is convenient for construction alignment and insertion into the reserved corrugated pipe, and the assembly construction is easy; the length of the connecting steel bar joint inserted into the cluster connection corrugated pipe is long, and the steel bar connection and anchoring safety is high; the cluster steel bar reduces the number of pre-buried cluster connection corrugated pipes without reducing the steel bar content, and the grouting efficiency is high and the construction speed is fast; at the same time, the top cap segments are assembled quickly and the prestressing installation is convenient.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cluster grouting corrugated pipe assembly pier connected to a prefabricated cap, characterized in that: It comprises a foundation, a pier column segment and a top cap, wherein the top cap comprises a top cap connecting segment and two top cap segments, a top cap connecting key is arranged on the end surface of the top cap segment, a pre-embedded steel plate 1 is pre-embedded on the outside of the top cap connecting key, top cap connecting grooves are arranged on the end surfaces on both sides of the top cap connecting segment, the top cap connecting grooves and the top cap connecting keys match each other, pre-embedded steel plates 2 are pre-embedded on both sides of the top cap connecting segment, the top cap connecting segment is connected to the top cap segment through a top cap splicing seam, and then the pre-embedded steel plates 1 and 2 are welded to each other; the foundation is formed by two foundation prefabricated segments connected through a foundation connecting seam, and the foundation prefabricated segments are connected through a foundation connecting seam. The segment is pre-embedded with connecting steel bars or bundled connecting corrugated pipes, one end of the pier column segment is pre-embedded with connecting steel bars, and the other end is pre-embedded with a bundled connecting corrugated pipe, and the top cap segment is pre-embedded with a bundled connecting corrugated pipe or connecting steel bars, and the bundled connecting corrugated pipe corresponds to the connecting steel bars one by one; the pre-embedded connecting steel bars are inserted into the bundled connecting corrugated pipe, and then high-strength grouting material is poured, and the steel strands are passed through the pre-embedded corrugated pipes pre-embedded in the top cap segment, the pier column segment, and the prefabricated foundation segment, and the steel strands are tensioned at the top of the top cap segment, and then the foundation connection seam is constructed, and concrete is poured into the two prefabricated foundation segments to complete the assembly of the bridge piers; The prefabricated foundation segment is a hollow square box with an opening on one side. The openings of the two prefabricated foundation segment boxes are arranged opposite to each other. Embedded steel bars are arranged on the end faces of the openings of the prefabricated foundation segment boxes. The embedded steel bars extend out of the end faces. The embedded steel bars are connected to each other through foundation connecting steel bars. The foundation connecting seams are cast between the openings of the prefabricated foundation segment boxes to achieve connection between the embedded steel bars. A pile foundation reserved hole is arranged on the bottom plate of the prefabricated foundation segment. The pile foundation and the pile foundation steel bars are inserted into the pile foundation reserved hole to achieve connection between the foundation and the pile foundation. The connecting steel bars are embedded in the top cap segment and the pier segment, extending out of the bottom surfaces of the top cap segment and the pier segment; the clustered connecting corrugated pipes are embedded in the pier segment and the top surface of the foundation, corresponding one to one with the connecting steel bars; the connecting steel bars are inserted into the clustered connecting corrugated pipes for connection; the connected steel bars on the clustered connecting corrugated pipes extend upward, so that the connecting steel bars embedded above the clustered connecting corrugated pipes are inserted therein, and the two are overlapped with each other.

2. The cluster grouting corrugated pipe assembly pier connected to a prefabricated cap according to claim 1, characterized in that: The connecting steel bars are embedded in the foundation and pier segments and extend out of the top surfaces of the foundation and pier segments. The connecting steel bars are composed of three or more ordinary steel bars, which are arranged in a circular or rectangular shape and arranged in steel bar bundles, and the stirrups are tied to the ordinary steel bars.

3. The clustered grouting corrugated pipe assembly pier connected to a prefabricated cap according to claim 2, characterized in that: The clustered connecting corrugated pipe is embedded in the bottom surface of the pier column segment and the top cap segment, corresponding to the connecting steel bars one by one, and is circular or rectangular in shape, 3 cm larger than one side of the connecting steel bars, and 2 cm longer than the connecting steel bars, with grouting holes provided thereon; the clustered connecting corrugated pipe is embedded in the inner side of the pier column steel bars, arranged along the circumference of the pier column segment, and connected to the pier column steel bars.

4. A cluster grouting corrugated pipe assembly pier connected to a prefabricated cap according to claim 1 or 3, characterized in that: Spiral ribs are arranged around the bundled connected corrugated pipes, and the spiral ribs are arranged in a spiral manner. Connected steel bars are arranged around the spiral ribs of the bundled connected corrugated pipes, and the connected steel bars are connected to the spiral ribs.

5. The clustered grouting corrugated pipe assembly pier connected to a prefabricated cap according to claim 1, characterized in that: The top cap connecting key adopts a convex structure, the embedded steel plate 1 adopts an annular steel plate, the outer contour of which is flush with the end face of the top cap segment, and is anchored to the top cap segment by anchor bar 1. The top cap connecting groove adopts a concave structure, the embedded steel plate 2 adopts an annular steel plate, which is arranged around the end face of the top cap connecting section, and is anchored to the top cap connecting section by anchor bar 2. The two ends of the embedded steel plates extend out of the top cap connecting section, and the embedded steel plate 2 and the embedded steel plate 1 are connected by a fillet weld to realize the connection between the top cap connecting section and the top cap segment.

6. The clustered grouting corrugated pipe assembly pier connected to a prefabricated cap according to claim 1, characterized in that: The embedded corrugated pipe is embedded in the corresponding positions of the top cap segment, the pier segment and the prefabricated foundation segment, and is arranged in a U shape. After the assembly between the segments is completed, the steel strand is inserted into the embedded corrugated pipe from top to bottom, and then the steel strand is arranged in a U shape and inserted into the corresponding embedded corrugated pipe from bottom to top. The steel strand anchor end is set above the top cap segment, the steel strand is tensioned, the foundation connection joint is constructed, and then concrete is poured.

7. The clustered grouting corrugated pipe assembly pier connected to a prefabricated cap according to claim 1, characterized in that: The foundation and the pier column segments, the adjacent pier column segments, and the pier column segments and the top cap segments are all connected by joints, and the joints are made of high-strength mortar or ultra-high performance concrete; the top cap joints connect the top cap segments and the top cap connecting segments using epoxy resin glue.

8. A construction method for assembling piers using the clustered grouting corrugated pipes connected to the prefabricated cap as described in any one of claims 1 to 7, characterized in that: The steps include: Step 1: The foundation prefabricated segments, pier segments, and top cap segments are prefabricated in the factory and are ready for installation; Step 2: construct the prefabricated foundation segments and connect the embedded steel bars through the foundation connecting steel bars; Step 3: Hoist the pier column segment, construct the splicing seam, and insert the embedded connecting steel bar into the bundled connecting corrugated pipe; hoist the top cap segment on one side, construct the splicing seam, and insert the embedded connecting steel bar into the bundled connecting corrugated pipe; Step 4: Hoist the top cap connection section, connect it with the top cap segment through the top cap joint, and then weld the second embedded steel plate with the first embedded steel plate; hoist the top cap segment on the other side, construct the joint, insert the embedded connecting steel bar into the bundled connecting corrugated pipe, and assemble it with the top cap connection section in the same way; Step 5: Pour high-strength grouting material into the bundled connection corrugated pipe to achieve connection between steel bars; Step 6: Pass the steel strand through the pre-buried corrugated pipe embedded in the top cap segment, pier segment and prefabricated foundation segment, and then pass it back to the top of the top cap segment in a U-shaped arrangement. Tension the steel strand at the top of the top cap segment, construct the foundation connection joint, and then pour concrete to complete the assembly of the piers.

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