A cluster grouting sleeve assembly pier connected to a prefabricated cap and a construction method thereof

Abstract

The present invention provides a cluster grouting sleeve assembly pier connected to a prefabricated cap and a construction method. The 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 sleeve. The pre-embedded connecting steel bars are inserted into the cluster connection sleeve, and then high-strength grouting material is poured; the top cap connection segment is connected with the top cap segment through a top cap splicing seam, and then the connecting bolt is connected with the connection sleeve; the steel strand is passed through the pre-embedded corrugated pipe pre-embedded on the top cap segment, the pier column segment and the foundation prefabricated segment, and the steel strand is tensioned on the top of the top cap and in the foundation, and then the foundation connection seam is constructed and concrete is poured to complete the assembly. The steel strand bundle arrangement of the assembled bridge pier connection has a large construction tolerance, low construction accuracy requirements, low assembly difficulty, high grouting efficiency, fast assembly between top cap segments, and convenient prestressing installation.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge structure construction, and in particular relates to a clustered grouting sleeve 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 sleeve 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 cluster grouting sleeve 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 sleeve 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 arranged on the end surface of the top cap segment, an embedded steel plate 1 is embedded on the outside of the top cap connecting key, an embedded sleeve is arranged on the embedded steel plate 1, top cap connecting grooves are arranged on both side end surfaces of the top cap connecting segment, the top cap connecting grooves match the top cap connecting key, embedded steel plates 2 are embedded on both sides of the top cap connecting segment, the outer contour of the embedded steel plates 2 is flush with the embedded steel plates 1, a connecting bolt hole is arranged on the embedded steel plates 2, and the connecting bolts pass through the connecting bolt holes and are connected to the embedded sleeves on the top cap segments, so as to realize the connection between the top cap connecting segment and the top cap segments. The foundation is formed by two prefabricated foundation segments connected by a foundation connecting seam, wherein connecting steel bars or cluster connecting sleeves are embedded in the prefabricated foundation segments, connecting steel bars are embedded at one end of the pier segment and a cluster connecting sleeve is embedded at the other end, and cluster connecting sleeves or connecting steel bars are embedded in the top cap segment, wherein the cluster connecting sleeves correspond to the connecting steel bars one by one; the embedded connecting steel bars are inserted into the cluster connecting sleeves, and then high-strength grouting material is poured, and the steel strands are passed through the embedded corrugated pipes embedded in the top cap segment, the pier segment and the prefabricated foundation segment, and the steel strands are tensioned at the top of the top cap segment and in the foundation, and then 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 pre-buried 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 shape, 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.

[0010] Furthermore, the cluster connection sleeve 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 cluster connection sleeve 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] Further, the cluster connection sleeve is a steel plate structure, welded by seamless steel pipe or ordinary steel plate, and its shape is round or square. Bolts are arranged on the cluster connection sleeve, and the bolts include external bolts and internal bolts. The external bolts are welded on the outer wall of the sleeve and dispersedly arranged along the height and horizontal direction of the cluster connection sleeve. The connection between the sleeve wall and the outer concrete is achieved through the external bolts to ensure the coordinated force between the sleeve wall and the outer concrete; the internal bolts are fixed on the inner wall of the sleeve, dispersedly arranged along the height and horizontal direction of the cluster connection sleeve, staggered with the external bolts, and extended into the sleeve wall for a certain length. A cover plate is welded on the top of the cluster connection sleeve to prevent the outer concrete from entering the sleeve. Connected steel bars are welded on the outer side of the sleeve wall. The connected steel bars are staggered in the gaps between the external bolts and the internal bolts. The connecting steel bars are arranged inside the sleeve wall and in the gaps between the internal bolts for easy insertion.

[0012] Furthermore, the embedded corrugated pipe is embedded in the corresponding positions of the top cap segment, the pier segment and the prefabricated foundation segment. After the assembly between the segments is completed, the steel strand is inserted into the embedded corrugated pipe from top to bottom, and the steel strand anchor end is set above the top cap segment and in the prefabricated foundation segment. The steel strand is tensioned and concrete is poured after the foundation is constructed.

[0013] Furthermore, sleeve stiffening ribs are arranged on the cluster connection sleeve, bolt holes are arranged on the sleeve stiffening ribs, and anchor steel bars are inserted into the bolt holes. When the cluster connection sleeve is subjected to tension, the tension is transmitted to the anchor steel bars through the sleeve stiffening ribs, and then the force is transmitted through the anchor steel bars, thereby realizing the force of the cluster connection sleeve.

[0014] 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 through anchor 1, the top cap connecting groove adopts a concave structure, and the embedded steel plate 2 adopts an annular steel plate, which is anchored to the top cap connecting section through anchor 2.

[0015] 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 cluster connection sleeves 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 cluster connection sleeves for connection; the connected steel bars on the cluster connection sleeves 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.

[0016] 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.

[0017] A construction method for assembling piers using the above-mentioned cluster grouting sleeves 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 sleeve; hoist the top cap segment on one side, construct the splicing seam, and insert the embedded connecting steel bar into the bundled connecting sleeve;

[0021] Step 4: Hoist the top hat connection section, connect it with the top hat segment through the top hat joint, and then connect the connection bolts with the embedded sleeve; hoist the top hat segment on the other side, construct the joint, insert the embedded connection steel bar into the bundled connection sleeve, and assemble it with the top hat connection section in the same way;

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

[0023] Step 6: Pass the steel strands through the pre-buried corrugated pipes embedded in the top cap segment, pier segment and prefabricated foundation segment, tension the steel strands at the top of the top cap segment and in the foundation, construct the foundation joints, and then pour concrete to complete the assembly of the piers.

[0024] Compared with the prior art, the clustered grouting sleeve 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 sleeve 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 sleeve, making assembly construction less difficult.

[0026] 2. The connecting steel bar joint inserted into the bundled connecting sleeve 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 sleeves 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 and meets the prestressing construction requirements by reserving tensioning space in the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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:

[0030] Figure 1 It is a front view of the present invention;

[0031] Figure 2 is a top view of the present invention;

[0032] 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;

[0033] Figure 4 It is a schematic diagram of the pier column segment in the present invention;

[0034] Figure 5 It is a schematic diagram of the top hat in the present invention;

[0035] 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;

[0036] 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;

[0037] Figure 8 It is a schematic diagram of a prestressed connection of a cluster grouting sleeve assembled pier connected to a prefabricated cap according to the present invention;

[0038] Fig. 9 It is a schematic side view of a prestressed connection of a clustered grouting sleeve assembled pier connected to a prefabricated cap according to the present invention;

[0039] Fig.1010-a is the front view of the precast foundation segment, and 10-b is the side view of the precast foundation segment;

[0040] Fig.11 11 -a is a schematic diagram of the connecting sleeve in the present invention, wherein 11 -a is a front view (after the connecting steel bar is inserted), 11 -b is a front view (without the connecting steel bar inserted), 11 -c is a top view (after the connecting steel bar is inserted), and 11 -d is a top view (without the connecting steel bar inserted);

[0041] Fig.12 12 - a is a schematic diagram of a second embodiment of a connecting sleeve in the present invention, wherein 12 - a is a front view, 12 - b is a side view, and 12 - c is a top view;

[0042] Fig.13 It is a schematic diagram of a second embodiment of a clustered grouting sleeve assembled pier connected to a prefabricated cap according to the present invention.

[0043] Description of reference numerals:

[0044] 1 Foundation 101 Prefabricated foundation segment 102 Embedded steel bars 103 Foundation connecting steel bars

[0045] 104 foundation joint 105 post-cast concrete 106 pile foundation reserved hole 107 pile foundation 108 pile foundation steel bar

[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] 404 embedded sleeve

[0049] 5 top hat connection section 501 top hat connection groove 502 embedded steel plate 2

[0050] 503 anchor bar 2 504 connecting bolt 505 connecting bolt hole

[0051] 6 Cluster connection sleeve 601 Stud 602 Connected steel bar 603 Cover plate

[0052] 604 sleeve stiffening rib 605 bolt hole 606 anchor steel bar

[0053] 7 Connecting steel bars 701 stirrups

[0054] 8 high-strength grouting material 9 top cap joint 10 grouting hole 11 pier column steel bar

[0055] 12 Pre-buried corrugated pipe 13 Steel strand 14 Steel strand anchor end DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] 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.

[0059] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0060] like Figure 1-5As shown, a cluster grouting sleeve assembled pier connected to a prefabricated cap comprises a foundation 1, a plurality of pier column segments 3 and a top cap, wherein the top cap comprises a top cap connecting segment 5 and two top cap segments 4, a top cap connecting key 401 is arranged on the end face of the top cap segment 4, an embedded steel plate 1 402 is embedded on the outer side of the top cap connecting key 401, an embedded sleeve 404 is arranged on the embedded steel plate 1 402, top cap connecting grooves 501 are arranged on both side end faces of the top cap connecting segment 5, the top cap connecting grooves 501 match with the top cap connecting key 401, embedded steel plates 2 502 are embedded on both sides of the top cap connecting segment 5, the outer contour of the embedded steel plates 2 502 is flush with the embedded steel plates 1 402, a connecting bolt hole 505 is arranged on the embedded steel plates 2 502, and the connecting bolts 504 pass through the connecting bolt holes 505 to connect to the top cap segment 4. The embedded sleeve 404 realizes the connection between the top cap connecting section 5 and the top cap segment 4; the foundation 1 is formed by two foundation prefabricated segments 101 connected by a foundation connecting seam 104, and connecting steel bars 7 are embedded in the top surfaces of the foundation prefabricated segment 101 and the pier segment 3, and cluster connecting sleeves 6 are embedded in the bottom surfaces of the pier segment 3 and the top cap segment 4, and the cluster connecting sleeves 6 correspond to the connecting steel bars 7 one by one; the embedded connecting steel bars 7 are inserted into the cluster connecting sleeves 6, and then the high-strength grouting material 8 is poured, and the steel strand 13 is passed through the embedded corrugated pipe 12 embedded in the top cap segment 4, the pier segment 3, and the foundation prefabricated segment 101, and the steel strand 13 is tensioned at the top of the top cap segment 4 and in the foundation 1, and then the foundation connecting seam 104 is constructed, and the concrete 105 is poured into the two foundation prefabricated segments 101 to complete the assembly of the bridge piers.

[0061] 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. When prestressing is required for assembling bridge piers, when prestressing is performed by embedded steel strands, it is difficult to insert the steel strands into the embedded 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 small and multiple ones need to be set, which brings inconvenience to the construction. By using a hollow box to provide tensioning space for the steel strands, the steel strands 13 are tensioned and anchored in the cavity of the prefabricated foundation segment 101. After the tensioning of the steel strands 13 is completed, concrete 105 is poured.

[0062] The connecting steel bar 7 is embedded in the foundation 1 and the pier segment 3, and extends a certain length from the top surface of the foundation 1 and the pier 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 construction of the steel bars between the segments. The stirrups 701 are tied to the ordinary steel bars to increase the integrity of the connecting steel bars. The bundled connecting sleeve 6 is embedded in the bottom surface of the pier segment 3 and the top cap segment 4, corresponding to the connecting steel bars 7 one by one. It 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. It is convenient for the connecting steel bar 7 to be inserted, and a grouting hole 10 is provided on it. The bundled connecting sleeve 6 is embedded in the inner side of the pier steel bar 11, arranged along the circumference of the pier segment 3, and connected to the pier steel bar 11.

[0063] like Fig.11As shown, the cluster connection sleeve 6 is a steel plate structure, which is welded by seamless steel pipes or ordinary steel plates, and its shape is round or square. Bolts 601 are set on the cluster connection sleeve 6, and the bolts 601 include external bolts and internal bolts. The external bolts are welded on the outer wall of the sleeve and dispersedly arranged along the height and plane direction of the cluster connection sleeve 6. The connection between the sleeve wall and the outer concrete is achieved through the external bolts to ensure the coordinated force between the sleeve wall and the outer concrete; the internal bolts are fixed on the inner wall of the sleeve, dispersedly arranged along the height and plane direction of the cluster connection sleeve 6, staggered with the external bolts, and extend into the sleeve wall for a certain length. A cover plate 603 is welded on the top of the cluster connection sleeve 6 to prevent the outer concrete from entering the sleeve. Connected steel bars 602 are welded on the outside of the sleeve wall and are arranged alternately in the gaps between external studs and internal studs. The connecting steel bars 7 are arranged inside the sleeve wall and in the gaps between internal studs for easy insertion.

[0064] The high-strength grouting material 8 is poured into the sleeve wall. After the connecting steel bar 7 is inserted into the sleeve wall, 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, forming 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 sleeve wall constrains the deformation of the high-strength grouting material 8. The high-strength grouting material 8 transmits the tension to the sleeve wall through the friction between the sleeve wall and the shear resistance provided by the built-in studs. The sleeve wall transmits part of the tension to the outer concrete through the external studs, and transmits part of the tension to the connected steel bar 602 through the weld, thereby realizing a reliable connection between the connecting steel bar 7 and the connected steel bar 602. 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.

[0065] like Figure 6-7As shown, a top hat connecting key 401 is arranged on the end face of the top hat segment 4, and adopts a convex structure. An embedded steel plate 402 is embedded outside the top hat connecting key 401, and adopts an annular steel plate, and the outer contour is flush with the end face of the top hat segment 4, and is anchored on the top hat segment 4 through an anchor bar 403. An embedded sleeve 404 is arranged on the embedded steel plate 402, and top hat connecting grooves 501 are arranged on the end faces of both sides of the top hat connecting segment 5, and adopt a concave structure, which matches the top hat connecting key 401. The top cap connection section 5 is pre-embedded with a second embedded steel plate 502 on both sides. The second embedded steel plate 502 is an annular steel plate. The outer contour of the second embedded steel plate 502 is flush with the first embedded steel plate 402. It is anchored on the top cap connection section 5 through the second anchor bar 503. A connecting bolt hole 505 is set on the second embedded steel plate 502. The connecting bolt 504 passes through the connecting bolt hole 505 and is connected to the embedded sleeve 404 on the top cap segment 4 to achieve the connection between the top cap connection section 5 and the top cap segment 4. The top cap joint seam 9 connects the top cap segment 4 and the top cap connection section 5, and epoxy resin glue is used.

[0066] 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 prefabricated foundation segment 101. 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 the steel strand anchoring end 14 is set above the top cap segment 4 and in the prefabricated foundation segment 101, the steel strand 13 is tensioned, and concrete 105 is poured after the foundation is constructed.

[0067] like Fig.12 As shown, sleeve stiffening ribs 604 are provided on the cluster connection sleeve 6, bolt holes 605 are provided on the sleeve stiffening ribs 604, and anchoring steel bars 606 are inserted into the bolt holes 605. When the cluster connection sleeve 6 is subjected to tension, the tension is transmitted to the anchoring steel bars 606 through the sleeve stiffening ribs 604, and then the force is transmitted through the anchoring steel bars 606, thereby realizing the force of the cluster connection sleeve.

[0068] like Fig.13 As shown, another embodiment of a clustered grouting sleeve assembled pier connected to a prefabricated cap is as follows: the connecting steel bar 7 is 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 sleeve 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 bar 7, and the connecting steel bar 7 is inserted into the clustered connecting sleeve 6 for connection; the connected steel bar 602 on the clustered connecting sleeve 6 extends upward, so that the connecting steel bar 7 embedded above the segment is inserted therein, and the two are overlapped by a certain length to form a connection between the two, thereby further increasing the connection strength.

[0069] A construction method for assembling piers using the above-mentioned cluster grouting sleeves connected to the prefabricated cap comprises the following steps:

[0070] 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;

[0071] Step 2: construct the foundation prefabricated segment 101 and connect the embedded steel bars 102 through the foundation connecting steel bars 103;

[0072] Step 3: hoist the pier column segment 3, construct the splicing seam 2, and insert the embedded connecting steel bar 7 into the cluster connecting sleeve 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 cluster connecting sleeve 6;

[0073] 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 connect the connecting bolt 504 with the embedded sleeve 404; 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 sleeve 6, and assemble it with the top hat connecting section 5 in the same way;

[0074] Step 5: pouring high-strength grouting material 8 into the cluster connection sleeve 6 to achieve connection between the steel bars;

[0075] Step 6: 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, tension the steel strand on the top of the top cap segment 4 and in the foundation 1, then construct the foundation joint 104, and then pour concrete 105 to complete the assembly of the bridge piers.

[0076] In the cluster grouting sleeve assembly pier connected to the prefabricated pedestal 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 bars are arranged in clusters, and a large gap is reserved between the cluster connection sleeve and the connecting steel bars, 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 sleeve, and the assembly construction is easy; the length of the connecting steel bar joint inserted into the cluster connection sleeve is long, and the steel bar connection and anchoring safety is high; the cluster steel bar reduces the number of pre-buried cluster connection sleeves 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.

[0077] 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 sleeve assembly pier connected to a prefabricated cap, characterized in that: It includes a foundation, a pier column segment and a top cap, wherein the top cap includes 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, an embedded steel plate 1 is embedded on the outside of the top cap connecting key, an embedded sleeve is arranged on the embedded steel plate 1, top cap connecting grooves are arranged on the end surfaces on both sides of the top cap connecting segment, the top cap connecting grooves match the top cap connecting key, embedded steel plates 2 are embedded on both sides of the top cap connecting segment, the outer contour of the embedded steel plate 2 is flush with the embedded steel plate 1, a connecting bolt hole is arranged on the embedded steel plate 2, and the connecting bolt passes through the connecting bolt hole and is connected to the embedded sleeve on the top cap segment to realize the connection between the top cap connecting segment and the top cap segment; the foundation is composed of The two prefabricated foundation segments are connected by a foundation connection seam, in which a connection steel bar or a cluster connection sleeve is pre-embedded, in which a connection steel bar is pre-embedded at one end of the pier segment and a cluster connection sleeve is pre-embedded at the other end, in which a cluster connection sleeve or a connection steel bar is pre-embedded in the top cap segment, and the cluster connection sleeve corresponds to the connection steel bar one by one; the pre-embedded connection steel bar is inserted into the cluster connection sleeve, and then high-strength grouting material is poured, and the steel strand is passed through the pre-embedded corrugated pipe pre-embedded in the top cap segment, the pier segment, and the prefabricated foundation segment, and the steel strand is tensioned at the top of the top cap segment and in the foundation, 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 top cap connecting key is convex, the embedded steel plate 1 is an annular steel plate, the outer contour 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 is concave, the embedded steel plate 2 is an annular steel plate, and is anchored to the top cap connecting section by anchor bar 2.

2. The cluster grouting sleeve assembly pier connected to the 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 cluster grouting sleeve assembly pier connected to the prefabricated cap according to claim 2, characterized in that: The cluster connection sleeve 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 bars, and 2 cm longer than the connecting steel bars, with grouting holes provided thereon; the cluster connection sleeve 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. The cluster grouting sleeve assembly pier connected to the prefabricated cap according to claim 3, characterized in that: The cluster connection sleeve is circular or square in shape, and bolts are arranged on the cluster connection sleeve, and the bolts include external bolts and internal bolts. There are multiple external bolts, which are welded on the outer wall of the sleeve and dispersedly arranged along the height and horizontal direction of the cluster connection sleeve; there are multiple internal bolts, which are fixed on the inner wall of the sleeve, dispersedly arranged along the height and horizontal direction of the cluster connection sleeve, staggered with the external bolts, and extended into the interior of the sleeve wall; a cover plate is welded on the top of the cluster connection sleeve; connected steel bars are welded on the outer side of the sleeve wall, and the connected steel bars are staggered in the gaps between the external bolts and the internal bolts, and the connecting steel bars are arranged inside the sleeve wall and in the gaps between the internal bolts.

5. The cluster grouting sleeve 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. After the assembly between the segments is completed, the steel strand is inserted into the embedded corrugated pipe from top to bottom, and the steel strand anchor end is arranged above the top cap segment and in the prefabricated foundation segment. The steel strand is tensioned, the foundation connection joint is constructed, and then concrete is poured.

6. The cluster grouting sleeve assembly pier connected to the prefabricated cap according to claim 4, characterized in that: A sleeve stiffening rib is arranged on the cluster connection sleeve, a bolt hole is arranged on the sleeve stiffening rib, and the anchoring steel bar is inserted into the bolt hole.

7. The cluster grouting sleeve assembly pier connected to a prefabricated cap according to claim 1, characterized in that: 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 cluster connection sleeves 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 cluster connection sleeves for connection; the connected steel bars on the cluster connection sleeves extend upward, so that the connecting steel bars embedded above the cluster connection sleeves are inserted therein, and the two are overlapped with each other.

8. A construction method for assembling piers using a cluster grouting sleeve connected to a prefabricated cap according to 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 sleeve; hoist the top cap segment on one side, construct the splicing seam, and insert the embedded connecting steel bar into the bundled connecting sleeve; Step 4: Hoist the top hat connection section, connect it with the top hat segment through the top hat joint, and then connect the connection bolts with the embedded sleeve; hoist the top hat segment on the other side, construct the joint, insert the embedded connection steel bar into the bundled connection sleeve, and assemble it with the top hat connection section in the same way; Step 5: Pour high-strength grouting material into the cluster connection sleeve to achieve connection between the steel bars; Step 6: Pass the steel strands through the pre-buried corrugated pipes embedded in the top cap segment, pier segment and prefabricated foundation segment, tension the steel strands at the top of the top cap segment and in the foundation, construct the foundation joints, and then pour concrete to complete the assembly of the piers.

Images