A connection device for a circular section prefabricated bridge pier and a pile foundation and an installation method thereof

Abstract

The present invention discloses a connection device for a circular section prefabricated bridge pier and a pile foundation, including a main reinforcement of the bridge pier, a main reinforcement of the pile foundation, a flange connector and a steel sleeve; the flange connector includes a steel pipe and a flange plate fixedly connected at both ends, and the flange connector is also provided with a stiffening rib and a shear nail, and the flange plate is provided with an inner reinforcement hole for the main reinforcement of the bridge pier to pass through and an outer reinforcement hole for the main reinforcement of the pile foundation to pass through, so as to connect the prefabricated bridge pier and the pile foundation together; the present invention also discloses an installation method for a connection device for a circular section prefabricated bridge pier and a pile foundation, and the installation is completed by prefabricating the flange connector and the prefabricated bridge pier as a whole, exposing the main reinforcement of the pile foundation at the slope head of the pile foundation, and installing the flange connector and the prefabricated bridge pier as a whole on the main reinforcement of the pile foundation. Through the above device and installation method, the problem of connecting reinforcement bars that are not on the same straight line is solved for the first time, and the device has strong practicality, clear stress state, simple structure, convenient installation, simple processing and manufacturing, and can be widely promoted and applied.

Description

Technical Field

[0001] The invention relates to the technical field of precast concrete assembly, and in particular to a connecting device for a circular-section precast bridge pier and a pile foundation and an installation method thereof. Background Art

[0002] Compared with traditional cast-in-place concrete piers, segmental prefabricated piers have the following advantages: ① The factory prefabrication of pier segments can improve the quality of piers, shorten the assembly construction time on site, and reduce traffic interference at the bridge site for bridges located in transportation hubs; ② The construction of some piers usually requires construction workers to be in dangerous areas such as high altitude, sea, highways or near power lines, while the construction of segmental prefabricated piers can greatly reduce the time construction workers spend in these dangerous areas, thereby improving the safety of the construction site; ③ Segmental prefabricated piers can reduce the impact of cross-sea, wetland and other environmentally sensitive areas on pier construction.

[0003] At present, the actual application projects include Donghai Bridge, Hangzhou Bay Cross-sea Bridge, Shanghai Yangtze River Bridge, Shanghai S6 Highway and Shanghai Jiamin Viaduct, Changsha Xiangfu Road Reconstruction Project, etc. The prefabricated structures of these bridges are connected by grouting sleeve connection, grouting metal bellows connection, socket connection, post-tensioned prestressed tendon connection, grouting mouth connection, wet joint connection and other technologies. At present, the bridges promoted and applied are mainly cross-sea, cross-river and municipal bridges, and the lower structures are all pile group foundations.

[0004] However, the substructures of mountain bridges and highway bridges are mostly based on circular cross-section pile-column bridge piers. The current connection technology is not suitable for direct application to such structures, and the connection of prefabricated structures is still blank. Therefore, the present invention ingeniously utilizes the diameter difference between the pile foundation and the bridge pier to invent a new type of connection device. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to develop a connection device for a circular cross-section prefabricated bridge pier and a pile foundation and an installation method thereof, to provide a device with simple structure, reliable installation and force bearing, convenient processing and manufacturing, and low cost, so as to solve the problem that the current connection technology of prefabricated structures is not suitable for direct application to structures dominated by circular cross-section pile-column piers, and the connection of prefabricated structures is still blank.

[0006] A connection device for a circular section prefabricated bridge pier and a pile foundation, used for the assembly design and construction of pile-column bridge piers, comprising:

[0007] The main reinforcement of the pier has one end buried in the prefabricated pier and the other end exposed from the connection end of the prefabricated pier and extending outwards;

[0008] The main reinforcement of the pile foundation has one end buried in the pile foundation and the other end exposed from the connecting end of the pile foundation and extending outwards;

[0009] A flange connector, comprising a steel pipe and a flange fixedly connected to both ends of the steel pipe, wherein the two flanges are arranged in parallel, and the flanges are provided with a plurality of inner reinforcement holes and a plurality of outer reinforcement holes, wherein the inner reinforcement holes are located on the inner side of the steel pipe, the inner reinforcement holes on the two flanges correspond to each other and are coaxial, the main reinforcement of the pier corresponds to the inner reinforcement holes one by one and is connected to the flange connector through the inner reinforcement holes; the outer reinforcement holes are located on the outer side of the steel pipe, the outer reinforcement holes on the two flanges correspond to each other and are coaxial, the main reinforcement of the pile foundation corresponds to the outer reinforcement holes one by one and is connected to the flange connector through the outer reinforcement holes, thereby connecting the prefabricated pier and the pile foundation together; and

[0010] The steel sleeve is sleeved on the ends of the pier main reinforcement and the pile foundation main reinforcement after the pier main reinforcement and the pile foundation main reinforcement pass through the flange connector to prevent the pier main reinforcement and the pile foundation main reinforcement from being pulled apart from the flange connector.

[0011] Furthermore, it also includes a washer, which is arranged between the steel sleeve and the flange. The washer can diffuse large stress distribution.

[0012] Furthermore, the flange connector also includes stiffening ribs, which are arranged between the inner and outer sides of the steel pipe and the flange, and are located on both sides of the inner steel bar hole and the outer steel bar hole. The arrangement of the stiffening ribs further improves the structural strength of the flange connector.

[0013] Furthermore, the flange connector also includes shear nails, which are fixedly arranged on the outer side of the circumference of the steel pipe, thereby improving the structural strength of the connection between the flange connector and the concrete covering the flange connector, and further improving the connection strength between the prefabricated bridge pier and the pile foundation cast on site.

[0014] A method for installing a connection device between a circular section prefabricated bridge pier and a pile foundation, using the connection device between the circular section prefabricated bridge pier and the pile foundation, comprises the following steps:

[0015] The flange connector and the prefabricated bridge pier are prefabricated together in the factory. The main reinforcement of the bridge pier is passed through the inner reinforcement holes on the two flange plates and through the inner side of the steel pipe. One flange of the flange connector is tightly attached to the connecting end face of the prefabricated bridge pier. Then the steel sleeve is sleeved on the end of the main reinforcement of the pier and fixed. The flange connector and the prefabricated bridge pier are integrated through the steel sleeve.

[0016] Transport prefabricated bridge piers to the installation site;

[0017] Before installation, the pile foundation is sloped first so that the main reinforcement of the pile foundation is exposed to the connection end surface;

[0018] Use lifting tools to suspend the prefabricated bridge piers and flange connectors;

[0019] Place the flange downwards and align the outer reinforcement holes on the flange with the main reinforcement of the pile foundation;

[0020] During the lowering process, the flange far from the prefabricated pier is passed through first, and then the flange close to the prefabricated pier is passed through; after passing through, a construction joint is reserved between the flange close to the pile foundation and the connecting end face of the pile foundation; then the steel sleeve is sleeved on the end of the main reinforcement of the pile foundation and fixed, and the main reinforcement of the pile foundation and the flange connector are fixed by the steel sleeve;

[0021] Temporary transverse fixing devices are provided around the prefabricated piers;

[0022] Install the main reinforcement stirrups of the pile foundation outside the flange connector;

[0023] Pouring construction joint concrete and outer cladding concrete;

[0024] The entire flange is buried in concrete to prevent corrosion and rust in the future;

[0025] After the concrete solidifies, remove the temporary horizontal fixings and remove the lifting tools;

[0026] The installation of the entire bridge pier is completed through the above steps.

[0027] By adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. In the connection device of the circular cross-section prefabricated bridge pier and pile foundation of the present invention, the main reinforcement of the bridge pier passes through the inner side of the steel pipe, and the main reinforcement of the pile foundation passes through the outer side of the steel pipe, which cleverly solves the problem that the diameter of the pile foundation is larger than the diameter of the bridge pier and the main reinforcements of the two are not on the same line. The structure is simple, the processing and manufacturing are simple, and the practicability is strong.

[0029] 2. When the structure is under stress, the pressure is borne by the concrete and the tension is borne by the steel bars; the tension of the main reinforcement of the pier is transmitted to the lower flange through the steel sleeve, and then transmitted to the lower stiffening rib, and then transmitted to the bottom of the steel pipe through shear force; the tension of the main reinforcement of the pile foundation is transmitted to the upper flange through the steel sleeve, and then transmitted to the upper stiffening rib, and then transmitted to the upper part of the steel pipe through shear force, which is balanced with the force on the lower part of the steel pipe, and the stress state is clear.

[0030] 3. The installation method of the connection device between the circular section prefabricated bridge pier and the pile foundation of the present invention is convenient and simple, and can be widely promoted and applied to the connection between the circular section pile foundation and the circular section prefabricated bridge pier. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0032] Figure 1 It is a schematic diagram of the connection between the circular cross-section pile foundation and the circular cross-section prefabricated bridge pier of the present invention;

[0033] Figure 2 It is a structural diagram of the flange connection of the present invention.

[0034] Figure 3 for Figure 2 AA section view in;

[0035] Figure 4 for Figure 2 BB section view in.

[0036] Reference numerals:

[0037] 1- Main reinforcement of bridge pier;

[0038] 2- Main reinforcement of pile foundation;

[0039] 3-flange connector, 31-steel pipe, 32-flange, 32a-inner steel bar hole, 32b-outer steel bar hole, 33-stiffening rib, 34-shear nail;

[0040] 4-Rebar sleeve;

[0041] 5-washer;

[0042] 100-Prefabricated bridge piers;

[0043] 200-pile foundation;

[0044] 300-construction joint concrete;

[0045] 400-External cladding concrete. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0047] Please also read Figure 1 and Figure 2 The present invention provides a connection device between a circular cross-section prefabricated pier and a pile foundation, comprising a pier main reinforcement 1, a pile foundation main reinforcement 2, a flange connector 3 and a steel sleeve 4.

[0048] One end of the main reinforcement 1 of the pier is buried in the prefabricated pier 100, and the other end is exposed from the connection end surface of the prefabricated pier 100 and extends outward. In this embodiment, the prefabricated pier 100 is cylindrical.

[0049] One end of the pile foundation main reinforcement 2 is buried in the pile foundation 200, and the other end is exposed from the connection end surface of the pile foundation 200 and extends outward. In this embodiment, the pile foundation 200 is cylindrical.

[0050] The flange connector 3 includes a steel pipe 31 and flanges 32 fixedly connected to both ends of the steel pipe 31. The two flanges 32 are arranged in parallel. A plurality of inner steel bar holes 32a and a plurality of outer steel bar holes 32b are provided on the flanges 32. The inner steel bar holes 32a are located on the inner side of the steel pipe 31. The inner steel bar holes 32a on the two flanges 32 correspond to each other and are coaxial. The main reinforcement 1 of the pier corresponds to the inner steel bar holes 32a one by one and is connected to the flange connector 3 through the inner steel bar holes 32a. The outer steel bar holes 32b are located on the outer side of the steel pipe 31. The outer steel bar holes 32b on the two flanges 32 correspond to each other and are coaxial. The main reinforcement 2 of the pile foundation corresponds to the outer steel bar holes 32b one by one and is connected to the flange connector 3 through the outer steel bar holes 32b, so that the prefabricated pier 100 is connected to the pile foundation 200. Specifically, the flange connector 3 may also be provided with stiffening ribs 33, which are provided between the inner and outer sides of the steel pipe 31 and the flange 32, and the stiffening ribs 33 are located on both sides of the inner steel bar hole 32a and the outer steel bar hole 32b. The provision of the stiffening ribs 33 further improves the structural strength of the flange connector 3. Of course, as a further optimization, the flange connector 3 may also be provided with shear nails 34, which are fixedly provided on the outer side of the circumference of the steel pipe 31. The provision of the shear nails 34 improves the structural strength of the connection between the flange connector 3 and the concrete covering the flange connector 3, thereby improving the connection strength between the prefabricated bridge pier 100 and the pile foundation 200 cast on site.

[0051] The steel sleeve 4 is sleeved on the ends of the pier main reinforcement 1 and the pile foundation main reinforcement 2 after the pier main reinforcement 1 and the pile foundation main reinforcement 2 pass through the flange connector 3 to prevent the pier main reinforcement 1 and the pile foundation main reinforcement 2 from being pulled apart from the flange connector 3.

[0052] As a further optimization solution, a gasket 5 is also included, and the gasket 5 is arranged between the steel sleeve 4 and the flange 32. The gasket 5 can diffuse the large stress distribution.

[0053] The present invention also provides an installation method for a connection device between a circular cross-section prefabricated bridge pier and a pile foundation. To implement the installation method, the above-mentioned bridge pier main reinforcement 1, pile foundation main reinforcement 2, flange connector 3, steel sleeve 4, gasket 5, prefabricated bridge pier 100 and pile foundation 200 are used. Specifically, the installation method includes the following steps:

[0054] The flange connector 3 and the prefabricated pier 100 are prefabricated together in the factory. The main reinforcement 1 of the pier is passed through the inner reinforcement holes 32a on the two flange plates 32 and through the inner side of the steel pipe 31. One flange of the flange connector 3 is tightly attached to the connecting end face of the prefabricated pier. Then, the steel sleeve 4 is sleeved on the end of the main reinforcement 1 of the pier and fixed. The flange connector 3 and the prefabricated pier 100 are formed into a whole through the steel sleeve 4.

[0055] Specifically, the flange connector 3 and the prefabricated pier 100 are first prefabricated in the factory. Note that when the pier 100 is prefabricated, the main reinforcement 1 of the pier is passed through the inner reinforcement holes 32a on the two flanges 32 of the flange connector 3. At this time, the main reinforcement 1 of the pier passes through the inner side of the steel pipe 31 of the flange connector 3. After the prefabricated pier 100 is prefabricated, a flange 32 of the flange connector 3 is tightly attached to the connecting end surface of the prefabricated pier 100. Then, the flange connector 3 is anchored to the prefabricated pier 100 by using a steel sleeve 4 at the end of the main reinforcement 1 of the pier, and the flange connector 3 and the prefabricated pier 100 are prefabricated into a whole.

[0056] The prefabricated bridge pier 100 is transported to the installation site.

[0057] Specifically, the prefabricated bridge pier 100 and the installed flange connector 3 are transported to the installation site as a whole, and attention is paid to protecting the installed flange connector 3.

[0058] Before installation, the pile foundation 200 is first sloped so that the main reinforcement 2 of the pile foundation is exposed at the connection end surface.

[0059] Specifically, before installation, the connection end of the pile foundation 200 needs to be sloped, and a sufficient length of the pile foundation main reinforcement 2 needs to be reserved at one connection end of the pile foundation 200.

[0060] The prefabricated bridge pier 100 and the flange connector 3 are suspended using a hoisting tool;

[0061] Specifically, the prefabricated bridge pier 100 and the flange connector 3 are hoisted as a whole and transported to the top of the pile foundation 200 by using an on-site crane.

[0062] The flange 32 is facing downward, and the outer reinforcement holes 32 b on the flange 32 are aligned with the main reinforcement 2 of the pile foundation.

[0063] Specifically, the pile foundation main reinforcement 2 is located outside the steel pipe 31 of the flange connector 3 .

[0064] During the lowering process, the flange 32 far away from the prefabricated pier 100 is passed through first, and then the flange 32 close to the prefabricated pier 100 is passed through. After passing through, a construction joint is reserved between the flange 32 of the flange connector 3 close to the pile foundation 200 and the connecting end face of the pile foundation 200; then the steel sleeve 4 is sleeved on the end of the pile foundation main reinforcement 2 and fixed, and the pile foundation main reinforcement 2 and the flange connector 3 are fixed by the steel sleeve 4.

[0065] Specifically, a steel sleeve 4 is used at the end of the main reinforcement 2 of the pile foundation to anchor the flange connector 3 on the pile foundation 200, and a construction joint is reserved between the connecting end faces of the flange plate 32 and the pile foundation 200 so that concrete can be filled between the connecting end faces of the flange plate 32 and the pile foundation 200 to improve the connection strength.

[0066] Temporary transverse fixing devices are arranged laterally on the prefabricated bridge pier 100 .

[0067] Specifically, there is no concrete support between the pile foundation 200 and the prefabricated bridge pier 100, and a temporary transverse fixing device is provided to fix the suspended prefabricated bridge pier 100 to prevent it from moving in the radial direction.

[0068] Install the stirrups of the pile foundation main reinforcement 2 outside the flange connector 3;

[0069] Specifically, since there is no concrete support between the pile foundation 200 and the prefabricated bridge pier 100 , outer stirrups are provided to prevent the main reinforcement of the pile foundation from bending and deforming at the flange connector 3 .

[0070] Pour 300mm of construction joint concrete and 400mm of outer covering concrete.

[0071] Formwork is provided around the flange connector 3, and the construction joint between the flange 32 and the pile foundation 200 is filled with concrete. Then, the main reinforcement 1 of the pier, the main reinforcement 2 of the pile foundation, the flange connector 3 and the steel sleeve 4 are all wrapped with concrete and poured together.

[0072] The entire flange connector 3 is buried in concrete to prevent later corrosion and rust.

[0073] After the concrete solidifies, remove the temporary horizontal fixing device and remove the lifting tools.

[0074] The installation of the entire bridge pier is completed through the above steps.

[0075] The stress conditions of the connection device between the circular section prefabricated pier and the pile foundation after installation are as follows:

[0076] The tension of the pier main reinforcement 1 and the pile foundation main reinforcement 2 is transmitted to the gasket 5 and the flange 32 through the steel sleeve 4;

[0077] Then, it is transferred to the stiffening rib 33 through the flange 32;

[0078] Finally, the internal force of the stiffening rib 33 is transmitted to the steel pipe 31, and the tension of the pile foundation main reinforcement 2 and the pier main reinforcement 1 is balanced with each other.

[0079] The above-mentioned connecting device between the circular section prefabricated bridge pier and the pile foundation solves the problem of connecting steel bars that are not on the same straight line for the first time, so that the main connecting bars between the pile foundation 200 and the prefabricated bridge pier 100 overlap and staggered at the connection, which greatly improves the structural strength and rigidity of the connection. It has strong practicality, clear stress state, simple structure, convenient installation, and simple processing and manufacturing. It can be widely promoted and applied to the connection between the circular section pile foundation 200 and the circular section prefabricated bridge pier 100.

[0080] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A connection device for a circular section prefabricated bridge pier and a pile foundation, used for the assembly design and construction of pile-column bridge piers, characterized in that: include: The main reinforcement of the pier has one end buried in the prefabricated pier and the other end exposed from the connection end of the prefabricated pier and extending outwards; The main reinforcement of the pile foundation has one end buried in the pile foundation and the other end exposed from the connecting end of the pile foundation and extending outwards; A flange connector, comprising a steel pipe and a flange fixedly connected to both ends of the steel pipe, wherein the two flanges are arranged in parallel, and the flanges are provided with a plurality of inner steel bar holes and a plurality of outer steel bar holes, wherein the inner steel bar holes are located on the inner side of the steel pipe, the inner steel bar holes on the two flanges correspond to each other and are coaxial, the main reinforcement of the pier corresponds to the inner steel bar holes one by one and are connected to the flange connector through the inner steel bar holes; the outer steel bar holes are located on the outer side of the steel pipe, the outer steel bar holes on the two flanges correspond to each other and are coaxial, the main reinforcement of the pile foundation corresponds to the outer steel bar holes one by one and are connected to the flange connector through the outer steel bar holes, thereby connecting the prefabricated pier and the pile foundation together; the flange connector also includes stiffening ribs, wherein the stiffening ribs are arranged between the inner and outer sides of the steel pipe and the flanges, and the stiffening ribs are located on both sides of the inner steel bar holes and the outer steel bar holes; and A steel sleeve, after the main reinforcement of the pier and the main reinforcement of the pile foundation pass through the flange connector, the steel sleeve is sleeved on the ends of the main reinforcement of the pier and the main reinforcement of the pile foundation to prevent the main reinforcement of the pier and the main reinforcement of the pile foundation from being pulled apart from the flange connector; It also includes a gasket, which is arranged between the steel sleeve and the flange.

2. The connection device between a circular section prefabricated bridge pier and a pile foundation according to claim 1, characterized in that: The flange connector also includes shear nails, which are fixed on the outer side of the circumference of the steel pipe.

3. A method for installing a connection device between a circular cross-section prefabricated bridge pier and a pile foundation, using the connection device between a circular cross-section prefabricated bridge pier and a pile foundation as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: The flange connector and the prefabricated bridge pier are prefabricated together in the factory. The main reinforcement of the bridge pier is passed through the inner reinforcement holes on the two flange plates and through the inner side of the steel pipe. One flange of the flange connector is tightly attached to the connecting end face of the prefabricated bridge pier. Then the steel sleeve is sleeved on the end of the main reinforcement of the pier and fixed. The flange connector and the prefabricated bridge pier are integrated through the steel sleeve. Transport prefabricated bridge piers to the installation site; Before installation, the pile foundation is sloped first so that the main reinforcement of the pile foundation is exposed to the connection end surface; Use lifting tools to suspend the prefabricated bridge piers and flange connectors; Place the flange downwards and align the outer reinforcement holes on the flange with the main reinforcement of the pile foundation; During the lowering process, the flange far from the precast pier is passed through first, and then the flange close to the precast pier is passed through; After the crossing, a construction joint is reserved between the flange plate of the flange connector close to the pile foundation and the connecting end face of the pile foundation; then the steel sleeve is sleeved on the end of the main reinforcement of the pile foundation and fixed, and the main reinforcement of the pile foundation and the flange connector are fixed by the steel sleeve; Temporary transverse fixing devices are provided around the prefabricated piers; Install the main reinforcement stirrups of the pile foundation outside the flange connector; Pouring construction joint concrete and outer cladding concrete; The entire flange connection is buried in concrete to prevent corrosion and rust in the future; After the concrete solidifies, remove the temporary horizontal fixings and remove the lifting tools; The installation of the entire bridge pier is completed through the above steps.

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