Prefabricated assembled pier structure

Abstract

The utility model relates to a prefabricated assembled pier structure which comprises a prefabricated cover beam and a prefabricated pier column, and the prefabricated pier column is formed by splicing at least two prefabricated pier column sections. A shear key and a shear groove which are matched with each other are arranged on the splicing end face of every two vertically adjacent prefabricated pier column sections, a pier column reinforcement cage is arranged in each prefabricated pier column section, and each pier column reinforcement cage is provided with a plurality of pier column main reinforcements which are arranged in the vertical direction. The upper end of the pier column main steel bar extends out of the upper end of the prefabricated pier column section, the lower end of the pier column main steel bar is sleeved with a grouting sleeve, and the upper end of the pier column main steel bar of the lower prefabricated pier column section is inserted into the grouting sleeve at the lower end of the upper prefabricated pier column section. According to the prefabricated assembled bridge pier structure, on-site operation and construction are greatly facilitated, the cost of construction measures is reduced, the overall performance between the bridge pier sections is greatly enhanced, the anti-seismic performance of the structure is greatly improved, and the equivalent cast-in-place component design is truly achieved.

Description

Technical Field

[0001] The utility model relates to the field of bridge construction, in particular to a prefabricated assembled bridge pier structure. Background Art

[0002] At present, with the full promotion of prefabrication and assembly technology in bridge structures, more and more new projects have begun to implement the concept of full prefabrication and assembly. In this process, the production, transportation and hoisting of large-size and large-tonnage prefabricated components have become a major technical bottleneck in improving the prefabrication and assembly rate of projects. The upper structure has been relatively mature due to the development of segmental beam technology, but the lower structure, especially for some super-high columns, how to lighten and segment has become a hot spot and difficulty in current research.

[0003] The key to the prefabrication of columns lies in the connection between the segments. The reliability of the connection determines the safety and durability of the structure. At present, the following connection methods are mainly used in the assembly of prefabricated columns at home and abroad: grouting sleeve, prestressed and mechanical sleeve connection. The connection between the column segments, the cap beam and the column, and the column and the abutment is an important node in the prefabricated assembly of bridge piers, and this part is often a weak link in seismic performance.

[0004] Chinese patent CN103374881A (a segmental prefabricated assembly structure system and construction method), the system uses small key teeth between segments, the segments are prestressed with embedded fixed ends before construction, the steel strands must be installed in place at the full pier height, and the cables must be hung for a long time. Only after all the columns are in place can they be uniformly grouted and tensioned. This process is very inconvenient for construction, and the prestressed form used is very wasteful. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a prefabricated assembled pier structure, which is easy to construct, reduces the cost of construction measures, greatly enhances the overall performance between pier segments, and greatly improves the seismic performance of the structure.

[0006] The utility model is implemented by the following scheme: a prefabricated assembled bridge pier structure, including a prefabricated cap beam and a prefabricated pier column, the prefabricated pier column is formed by splicing at least two prefabricated pier column segments; matching shear keys and shear grooves are provided at the splicing end faces of the upper and lower adjacent prefabricated pier column segments, each prefabricated pier column segment is provided with a pier column steel bar cage, the pier column steel bar cage has a plurality of pier column main steel bars arranged vertically, the upper ends of the pier column main steel bars extend from the upper ends of the prefabricated pier column segments, and the lower ends are sleeved with grouting sleeves, and the upper ends of the pier column main steel bars of the lower prefabricated pier column segments are inserted into the grouting sleeves at the lower ends of the upper prefabricated pier column segments.

[0007] Furthermore, prestressed steel strands are connected between the upper and lower adjacent prefabricated pier column segments, a tensioning anchor end is provided at the upper end of the upper prefabricated pier column segment, and a fixed anchor end is provided inside the lower prefabricated pier column segment.

[0008] Furthermore, matching shear keys and shear grooves are also provided at the splicing end faces of the prefabricated cap beam and the upper prefabricated pier column segment, the prefabricated cap beam and the upper prefabricated pier column segment are also connected with prestressed steel strands, the upper end of the prefabricated cap beam is provided with a tensioning anchor end, and the upper part of the upper prefabricated pier column segment is provided with a fixed anchor end; the prefabricated cap beam is vertically provided with cap beam main steel bars, the lower end of the cap beam main steel bars is sleeved with a grouting sleeve, and the upper end of the pier column main steel bars of the upper prefabricated pier column segment is inserted into the grouting sleeve at the lower end of the prefabricated cap beam.

[0009] Furthermore, the prefabricated cap beam adopts a vase-type cap beam structure, and a pier shockproof stopper is provided at the upper end of the prefabricated cap beam, and a pier shockproof stopper is provided in the middle of the tensioning anchor end at the upper end of the prefabricated cap beam.

[0010] Furthermore, a pedestal is provided under the prefabricated pier column, and a pile foundation is provided under the pedestal; a pedestal main steel bar is vertically provided inside the pedestal, and the upper end of the pedestal main steel bar extends from the upper end surface of the pedestal and is inserted into the grouting sleeve at the lower end of the lower prefabricated pier column segment.

[0011] Furthermore, an adjusting pad is provided on the upper end surface of the pedestal, and a joint mortar cushion layer is filled at the joint between the lower prefabricated pier column segment and the pedestal, and the outer peripheral side of the joint is sealed with epoxy mortar.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the prefabricated assembled pier structure of the utility model greatly facilitates on-site operation, is easy to construct, reduces the cost of construction measures, greatly enhances the overall performance between pier segments, greatly improves the seismic performance of the structure, and truly realizes the equivalent of cast-in-place component design.

[0013] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through specific embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the bridge pier structure according to an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the main reinforcement connection of the pier in the embodiment of the utility model;

[0016] Figure 3 This is a schematic diagram of the connection of prestressed steel strands in a bridge pier according to an embodiment of the utility model;

[0017] Figure 4 It is a schematic diagram of the shear key and shear groove structure of the bridge pier in the embodiment of the utility model;

[0018] Figure 5 This is a schematic diagram of the grouting sleeve connection of the bridge pier in the embodiment of the utility model;

[0019] Figure 6 This is a schematic diagram of step 2 of the construction method of the utility model embodiment;

[0020] Figure 7 This is a schematic diagram of step 3 of the construction method of the utility model embodiment;

[0021] Figure 8 This is a schematic diagram of step 4 of the construction method of the utility model embodiment;

[0022] Fig. 9 This is a schematic diagram of step 5 of the construction method of the utility model embodiment;

[0023] Fig.10 This is a schematic diagram of step 6 of the construction method of the utility model embodiment;

[0024] Fig.11 This is a schematic diagram of step 7 of the construction method of the utility model embodiment;

[0025] Fig.12 This is a schematic diagram of step 8 of the construction method of the utility model embodiment;

[0026] Fig.13 This is a schematic diagram of step 9 of the construction method of the utility model embodiment;

[0027] Explanation of numbers in the figure: 1-precast cap beam, 2-precast pier, 3-precast pier segment, 4-shear key, 5-shear groove, 6-pier main reinforcement, 7-grouting sleeve, 8-prestressed steel strand, 9-tensioning anchor end, 10-fixed anchor end, 11-cap beam main reinforcement, 12-pier seismic stopper, 13-cap, 14-pile foundation, 15-cap main reinforcement, 16-adjustment pad, 17-joint mortar cushion, 18-epoxy mortar sealing, 19-bearing pedestal, 20-sealing ring, 21-grouting pipe, 22-grouting pipe, 23-plug. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] like Figures 1 to 5 As shown, a prefabricated assembled bridge pier structure comprises a prefabricated cap beam 1 and a prefabricated pier column 2. The prefabricated pier column 2 is formed by splicing at least two prefabricated pier column segments 3. The prefabricated pier column can be divided into two sections (i.e., an upper prefabricated pier column segment and a lower prefabricated pier column segment) according to its height, or it can be divided into more than three sections (i.e., an upper prefabricated pier column segment, at least one middle prefabricated pier column segment and a lower prefabricated pier column segment, and the middle prefabricated pier column segment can also be one or more sections. More than two sections); The joint end faces of the two adjacent upper and lower prefabricated pier column segments are provided with matching shear keys 4 and shear grooves 5, and each prefabricated pier column segment is provided with a pier column steel cage inside, and the pier column steel cage has a plurality of pier column main steel bars 6 arranged vertically, the upper ends of the pier column main steel bars extend from the upper ends of the prefabricated pier column segments, and the lower ends are sleeved with grouting sleeves 7, and the upper ends of the pier column main steel bars of the lower prefabricated pier column segment are inserted into the grouting sleeves at the lower ends of the upper prefabricated pier column segments.

[0031] In this embodiment, a prestressed steel strand 8 is connected between two adjacent upper and lower prefabricated pier column segments, a tension anchoring end 9 is provided at the upper end of the upper prefabricated pier column segment, and a fixed anchoring end 10 is provided inside the lower prefabricated pier column segment.

[0032] In this embodiment, the splicing end faces of the prefabricated cap beam 1 and the upper prefabricated pier column segment are also provided with matching shear keys 4 and shear grooves 5, the prefabricated cap beam and the upper prefabricated pier column segment are also connected with prestressed steel strands 8, the upper end of the prefabricated cap beam is provided with a tensioning anchor end 9, and the upper part of the upper prefabricated pier column segment is provided with a fixed anchor end 10; the prefabricated cap beam is vertically provided with a cap beam main steel bar 11, the lower end of the cap beam main steel bar is sleeved with a grouting sleeve, and the upper end of the pier column main steel bar of the upper prefabricated pier column segment is inserted into the grouting sleeve at the lower end of the prefabricated cap beam.

[0033] Prestressed steel strand installation process: embedded parts installation, component hoisting, steel strand threading, anchor installation and tensioning, grouting and anchor sealing:

[0034] 1) Installation of embedded parts: adopt the prefabricated segment assembly method, the anchor assembly is embedded in the pier in the factory, and the grouting pipe is led out. The embedded pipe should be firmly fixed to the steel bars in the pier or cap beam; the tensioning end anchor plate and spiral reinforcement on the cap beam are cast together with the seismic stopper of the pier at the top of the cap beam. The stopper is implemented in two phases, the second phase is implemented after the vertical prestressing tensioning grouting is completed.

[0035] 2) Threading the steel strands: The prefabricated components are transported to the construction site for assembly. After assembly, the steel strands are inserted into the holes and the fixed ends are self-locking.

[0036] 3) Tensioning: tensioning and anchoring are carried out on the upper prefabricated pier segment or the top of the prefabricated cap beam.

[0037] 4) Grouting and anchor sealing: Grouting is done from bottom to top, and anchor sealing is done after grouting is completed. The compressive strength of the grouting material shall not be less than 40MPa. Vacuum grouting is used, and the relevant construction process shall meet

[0038] In this embodiment, the prefabricated cap beam 1 adopts a vase-type cap beam structure, the upper end of the prefabricated cap beam is provided with a pier anti-vibration block 12, and the tension anchoring end of the upper end of the prefabricated cap beam is provided in the middle of the pier anti-vibration block 12. Vase-type piers are widely used in bridge engineering due to their beautiful appearance and reasonable force.

[0039] In this embodiment, a plurality of support stones 19 are further provided at the upper end of the prefabricated cap beam 1 .

[0040] In this embodiment, a cap 13 is provided under the prefabricated pier column, and a pile foundation 14 is provided under the cap; a cap main steel bar 15 is vertically provided inside the cap, and the upper end of the cap main steel bar extends from the upper end surface of the cap and is inserted into the grouting sleeve at the lower end of the lower prefabricated pier column segment.

[0041] In this embodiment, a 2 cm thick adjusting pad 16 with a plane size of 30*30 cm is provided on the upper end surface of the pedestal. The adjusting pad is made of stainless steel plate. The joint between the lower prefabricated pier segment and the pedestal is filled with a joint mortar cushion layer 17, and the outer peripheral side of the joint is sealed with epoxy mortar 18.

[0042] In this embodiment, the shear key 4 and the shear groove 5 are both prism-shaped, the top and bottom surfaces of the shear key 4 are both square, the side length of the top surface is 50 cm, the side length of the bottom surface is 70 cm, the height of the shear key 4 is 10 cm, and the internal dimensions of the shear groove correspond to the shear key 4.

[0043] The utility model is based on the principles of matching construction, strengthening the connection between components and segments, and adopts the following structure: 1. The upper curved section of the pier is divided into a vase-shaped cap beam, and the lower pier column is divided into standard prefabricated pier column segments, and the length of the prefabricated pier column segment does not exceed 13m; 2. The segments are connected in three layers: (1) The upper and lower components are connected by large shear teeth, the upper component uses a concave key, and the lower component uses a convex key, which is convenient for construction. The large shear tooth connection can play a convex tenon role, which is beneficial to strengthen the joint effect of the upper and lower components and improve the seismic performance; (2) The main steel bars are connected by grouting sleeves; (3) The upper and lower components are connected by self-locking vertical prestressed steel strands, and the segmented vertical prestressed steel strands are used to replace the traditional precision-rolled threaded steel and integral steel strands. While effectively increasing the compressive stress between the segments, it also greatly facilitates construction and reduces the cost of construction measures. This connection method is safe and reliable, has good seismic performance, and is convenient for construction. That is, a fixed anchor end and a corresponding prestressed pipe space are reserved in the lower component, and a tensioning anchor end and a corresponding prestressed pipe space are reserved in the upper component. After the components are installed in place, self-locking prestressed steel strands are placed. The fixed anchor end is provided with a grouting hole that runs through the side of the pier column, and finally tensioning grouting is performed. This process is simple, safe and reliable.

[0044] like Figures 6 to 13As shown, the construction method of the prefabricated assembled bridge pier structure of the utility model comprises the following steps: 1. The prefabricated cap beam and the prefabricated pier column segments are all prefabricated in the factory; 2. The pile foundation and the pedestal are constructed, and the pedestal main steel bars are pre-embedded; 3. The pedestal and the lower prefabricated pier column splicing surface are matched and constructed, the splicing surface is cleaned and measured, and the pad is adjusted for leveling; 4. The lower prefabricated pier column segment is hoisted into place, and the temporary adjustment equipment is installed to adjust the verticality of the lower prefabricated pier column segment, and the joint between the lower prefabricated pier column segment and the pedestal is adjusted. Pour high-strength mortar to form a joint mortar cushion layer; 5. Grout the grouting sleeve in the lower prefabricated pier column segment, and use epoxy mortar to seal the outer peripheral side of the joint between the abutment and the lower prefabricated pier column segment. Remove the temporary adjustment equipment, and backfill the foundation pit after the strength of the joint mortar cushion layer and the grouting sleeve meets the requirements, and proceed to the next stage of construction; 6. Pre-assemble the upper prefabricated pier column segment, clean the contact surface and apply epoxy adhesive. The thickness of the epoxy adhesive is 2.5mm and the flatness is 1mm. The upper prefabricated pier column segment is hoisted After the verticality is adjusted, install temporary adjustment equipment to adjust the verticality of the prefabricated pier segment; 7. After the verticality is adjusted, tension the prestressed steel strands. After the prestressing is tensioned, the compressive stress of the joint surface should be guaranteed to be ≥0.3MPa, and the pipeline where the prestressed steel strands are located should be grouting and anchoring. The grouting sleeve can be grouting after the epoxy adhesive is cured for 1 day. After the grouting strength of the sleeve meets the requirements, the next stage of construction can be carried out; 8. Set up temporary brackets for prefabricated cap beams for pre-assembly of prefabricated cap beams, clean the contact surface and apply Epoxy adhesive, epoxy adhesive thickness 2.5mm, flatness 1mm; prefabricated cap beam is hoisted into place, temporary adjustment equipment is installed, and the verticality of the prefabricated cap beam is adjusted; 9. After the verticality is adjusted, the prestressed steel strands are tensioned. After the temporary prestressing is tensioned, the compressive stress of the splicing surface should be guaranteed to be ≥0.3MPa, and the pipeline where the prestressed steel strands are located should be grouting and anchoring; the grouting sleeve can be grouted only after the epoxy adhesive is cured for 1 day, and the temporary support should be removed after the grouting strength of the sleeve meets the requirements.

[0045] In the specific construction process, if the prefabricated pier column is divided into more than three prefabricated pier column segments, the middle prefabricated pier column segment can be installed first by adopting the method in step 6, and then the upper prefabricated pier column segment can be installed after the installation of the middle prefabricated pier column segment is completed.

[0046] The utility model greatly enhances the overall performance between the pier segments, greatly improves the seismic performance of the structure, and truly realizes the equivalent of cast-in-place component design. The connection between the segments adopts a three-layer connection system: (1) the upper and lower components are connected by large shear teeth; (2) the main steel bars are connected by grouting sleeves; (3) the upper and lower components are connected by vertical prestressed steel strands. This connection system greatly facilitates on-site operation, construction, and reduces the cost of construction measures. Self-locking prestressed connections are used between the pier segments and between the pier segments and the vase-shaped cap beams. The corresponding prestress is arranged according to the matching construction needs, which not only meets the structural force but also facilitates construction.

[0047] Unless otherwise stated, any technical solution disclosed in the above utility model, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many feasible numerical values. Since there are too many numerical values ​​to be exhaustive, the utility model discloses only some numerical values ​​to illustrate the technical solution of the utility model, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the utility model.

[0048] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0049] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0050] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0051] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A prefabricated assembled bridge pier structure, characterized in that: It comprises a prefabricated cap beam and a prefabricated pier column, wherein the prefabricated pier column is formed by splicing at least two prefabricated pier column segments; matching shear keys and shear grooves are arranged at the splicing end faces of the two upper and lower adjacent prefabricated pier column segments, and a pier column steel bar cage is arranged inside each prefabricated pier column segment, wherein the pier column steel bar cage has a plurality of pier column main steel bars arranged vertically, wherein the upper ends of the pier column main steel bars extend out from the upper ends of the prefabricated pier column segments, and the lower ends are sleeved with grouting sleeves, and the upper ends of the pier column main steel bars of the lower prefabricated pier column segments are inserted into the grouting sleeves at the lower ends of the upper prefabricated pier column segments.

2. The prefabricated assembled bridge pier structure according to claim 1 is characterized in that: Prestressed steel strands are also connected between the upper and lower adjacent prefabricated pier column segments. A tension anchor end is provided at the upper end of the upper prefabricated pier column segment, and a fixed anchor end is provided inside the lower prefabricated pier column segment.

3. The prefabricated assembled bridge pier structure according to claim 1 is characterized in that: Matching shear keys and shear grooves are also provided at the splicing end faces of the prefabricated cap beam and the upper prefabricated pier column segment. The prefabricated cap beam and the upper prefabricated pier column segment are also connected with prestressed steel strands. A tensioning anchor end is provided at the upper end of the prefabricated cap beam, and a fixed anchor end is provided inside the upper prefabricated pier column segment. The prefabricated cap beam is vertically provided with cap beam main steel bars, and a grouting sleeve is sleeved at the lower end of the cap beam main steel bars. The upper end of the pier column main steel bars of the upper prefabricated pier column segment is inserted into the grouting sleeve at the lower end of the prefabricated cap beam.

4. The prefabricated assembled bridge pier structure according to claim 3 is characterized in that: The prefabricated cap beam adopts a vase-type cap beam structure, and a bridge pier shockproof stopper is arranged at the upper end of the prefabricated cap beam, and the tension anchoring end at the upper end of the prefabricated cap beam is arranged in the middle of the bridge pier shockproof stopper.

5. The prefabricated assembled bridge pier structure according to claim 1 is characterized in that: A pedestal is provided under the prefabricated pier column, and a pile foundation is provided under the pedestal; main pedestal reinforcement is vertically provided inside the pedestal, and the upper end of the main pedestal reinforcement extends from the upper end surface of the pedestal and is inserted into the grouting sleeve at the lower end of the lower prefabricated pier column segment.

6. The prefabricated assembled bridge pier structure according to claim 5 is characterized in that: The upper end surface of the pedestal is provided with an adjusting pad, the joint between the lower prefabricated pier column segment and the pedestal is filled with a joint mortar cushion layer, and the outer peripheral side of the joint is sealed with epoxy mortar.

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