Composite pile column type pier structure with built-in steel pipe

Abstract

The utility model discloses a composite pile column type pier structure adopting a built-in steel pipe, which relates to the technical field of bridge construction and comprises a pile foundation and a pile foundation reinforcing steel bar, and the top end of the pile foundation reinforcing steel bar is connected with a first-section prefabricated reinforcement cage through a reinforcing steel bar joint; the first-section prefabricated reinforcement cage is formed by pouring concrete and the UHPC shell; the bottom end of the UHPC shell is prefabricated to be conical, and the bottom end of the UHPC shell is wrapped with a conical steel plate. The straining beam is mounted at the top end of the pile foundation, and a straining beam built-in steel pipe and a straining beam reserved steel bar are pre-buried in the straining beam; a column body built-in steel pipe is pre-buried in the center of the pier column, and the tie beam built-in steel pipe extends into the bottom of the column body built-in steel pipe; a grouting sleeve is mounted at the bottom of the pier column; and the tie beam reserved steel bar extends into the grouting sleeve. The UHPC is used at the part of the bridge pier, which is mainly scoured and corroded by seawater, so that the damage of seawater to the bridge pier can be reduced, and the durability of the bridge pier is improved; and meanwhile, connection between the pile foundation and the bridge pier is enhanced by adopting grouting sleeve connection and steel pipe nesting connection, so that the safety of the bridge is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a composite pile-column bridge pier structure with built-in steel pipes. Background Art

[0002] With the acceleration of urbanization and the growth of transportation demand, the construction of large-scale projects such as cross-river and cross-sea bridges has become an important part of infrastructure construction in various countries. In these projects, pile-column bridge piers, as a common structural form, bear an important supporting function of the bridge. However, pile-column bridge piers are susceptible to factors such as seawater scouring, immersion and atmospheric corrosion, and their bottom structures are often easily damaged, which threatens the safety and service life of the bridge.

[0003] To solve this problem, prefabricated pier structures came into being. Their characteristics of rapid installation and controlled quality have been widely used in large-scale bridge construction. Prefabricated piers greatly shorten the construction period and improve engineering efficiency by prefabricating components in the factory and then assembling them on site. This structural form is not only suitable for general bridge construction, but also widely used in special projects such as cross-river and cross-sea bridges, providing strong support for the smooth progress of the project. However, although prefabricated piers have many advantages in engineering construction, there are still challenges for the parts of the piers that are susceptible to scouring. Especially at the connection between the pile foundation and the pier column, due to the particularity of the structure, stiffness mutations are prone to occur, which leads to the destruction of the piers.

[0004] Therefore, a protective measure is urgently needed to improve the anti-scouring ability of the bottom structure of the pier and extend the service life of the bridge. Utility Model Content

[0005] The utility model aims to provide a composite pile-column bridge pier structure using an internal steel pipe to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following solution: The utility model provides a composite pile-column bridge pier structure using an internal steel pipe, comprising:

[0007] A pile foundation comprises pile foundation steel bars, the top of which is connected to a first section of a prefabricated steel cage through a steel bar joint; the first section of the prefabricated steel cage is formed by pouring concrete and a UHPC shell; the bottom end of the UHPC shell is prefabricated into a cone, and the bottom end of the UHPC shell is covered with a cone-shaped steel plate; the UHPC shell is located at the riverbed;

[0008] A tie beam, which is installed at the top of the pile foundation; it is cast after being supported by the tie beam steel bars; the tie beam internal steel pipe and the tie beam reserved steel bars are embedded in the tie beam;

[0009] A pier column, wherein a column body built-in steel pipe is pre-buried in the center of the pier column, the bottom end of the column body built-in steel pipe is arranged outside the tie beam built-in steel pipe, and the tie beam built-in steel pipe extends into the bottom of the column body built-in steel pipe; a grouting sleeve is installed at the bottom of the pier column; the reserved steel bars of the tie beam extend into the grouting sleeve.

[0010] The pile foundation reinforcement, the first section of prefabricated reinforcement cage, the UHPC shell and the conical steel plate are prefabricated into the pile foundation through the concrete.

[0011] The steel bar joints on the pile foundation steel bars and the first section of the prefabricated steel cage are staggered and the connection length is not less than 500 mm.

[0012] A PVC pipe is fixedly installed on the top of the pile foundation, and the PVC pipe is used to chisel out the pile head after the concrete of the pile foundation is poured.

[0013] The tie beam reserved steel bars are centered on the tie beam built-in steel pipe, and at least two are symmetrically arranged in the circumferential direction; the tie beam built-in steel pipe and the tie beam reserved steel bars are both placed on the top of the pile foundation, and the tie beam reserved steel bars are welded to the steel cage on the top of the pile foundation; the top end of the tie beam built-in steel pipe extends out of the tie beam top plane.

[0014] The utility model discloses the following technical effects: the utility model uses UHPC at the part of the bridge pier that is mainly affected by seawater scouring and corrosion, which can reduce the damage of seawater to the bridge pier and improve the durability of the bridge pier; in order to avoid the difference in stiffness between the pile foundation and the bridge pier due to the partial use of UHPC, a steel pipe is used at this connection to improve the stiffness of the column section, and reduce the excessive difference in stiffness at the pile-column connection caused by the use of UHPC at the part of the pile foundation top that is prone to scouring, and at the same time, a grouting sleeve connection and a steel pipe nested connection are used to strengthen the connection between the pile foundation and the bridge pier, thereby ensuring the safety of the bridge.

[0015] In addition, by combining UHPC with reinforced concrete structures, the bearing capacity of the pile foundation can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a schematic diagram of the connection between UHPC and the lower pile foundation steel cage;

[0018] Figure 2 This is a schematic diagram of the UHPC shell positioning and installation;

[0019] Figure 3 It is a three-dimensional schematic diagram of the splicing of tie beams and piers;

[0020] Figure 4 This is a schematic diagram of the removal of the pile head;

[0021] Figure 5 A three-dimensional schematic diagram of the removal of the pile head;

[0022] Figure 6 This is a schematic diagram of the pile foundation after the pile head is chiseled off;

[0023] Figure 7 This is a three-dimensional schematic diagram after the pile head is chiseled off;

[0024] Figure 8 This is a schematic diagram of the connection between pile foundation and tie beam;

[0025] Fig. 9 It is a three-dimensional schematic diagram of the connection between pile foundation and tie beam;

[0026] Fig.10 This is a schematic diagram of pier column splicing;

[0027] Fig.11 It is a three-dimensional schematic diagram of pier column splicing;

[0028] Fig.12 for Fig.10 Middle Ⅰ-Ⅰ section profile;

[0029] Fig.13 for Fig.10 Middle II-II cross-section;

[0030] Among them, 1. UHPC shell; 2. Concrete; 3. Pile foundation steel bars; 4. First section prefabricated steel cage; 5. Conical steel plate; 6. Steel bar joints; 7. Steel pipes built into tie beams; 8. Steel pipes built into column bodies; 9. Tie beams; 10. Tie beam steel bars; 11. Grouting sleeves; 12. PVC pipes; 13. Piers; 14. Pile foundations; 15. Reserved steel bars for tie beams; 16. Steel pipe piles; 17. Steel casings; 18. Steel clamps. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] like Figure 1-Figure 13 As shown, the utility model provides a composite pile-column bridge pier structure using an internal steel pipe, including a pile foundation 14, including pile foundation steel bars 3, the top of the pile foundation steel bars 3 is connected to the first section prefabricated steel cage 4 through a steel bar joint 6; the first section prefabricated steel cage 4 is formed by pouring concrete 2 and a UHPC shell 1; the bottom end of the UHPC shell 1 is prefabricated into a cone, and the bottom end of the UHPC shell 1 is covered with a cone steel plate 5;

[0034] The tie beam 9 is installed at the top of the pile foundation 14; it is cast after being molded by the tie beam reinforcement 10; the tie beam built-in steel pipe 7 and the tie beam reserved reinforcement 15 are embedded in the tie beam 9;

[0035] The pier column 13 has a column body built-in steel pipe 8 embedded in the center thereof, the bottom end of the column body built-in steel pipe 8 is arranged outside the tie beam built-in steel pipe 7, and the tie beam built-in steel pipe 7 extends into the bottom of the column body built-in steel pipe 8; a grouting sleeve 11 is installed at the bottom of the pier column 13; and the tie beam reserved steel bars 15 extend into the grouting sleeve 11.

[0036] The pile foundation reinforcement 3, the first section of the prefabricated reinforcement cage 4, the UHPC shell 1 and the conical steel plate 5 are prefabricated into a pile foundation 14 by concrete.

[0037] The reinforcement joints 6 on the pile foundation reinforcement 3 and the first section prefabricated reinforcement cage 4 are staggered and the connection length is not less than 500 mm.

[0038] A PVC pipe 12 is fixedly installed on the top of the pile foundation 14. The PVC pipe 12 is used to chisel out the pile head after the concrete pouring of the pile foundation 14 is completed.

[0039] At least two tie beam reserved steel bars 15 are arranged symmetrically in the circumferential direction with the tie beam built-in steel pipe 7 as the center; the tie beam built-in steel pipe 7 and the tie beam reserved steel bars 15 are both placed on the top of the pile foundation 14, and the tie beam reserved steel bars 15 are welded to the steel cage on the top of the pile foundation 14; the top end of the tie beam built-in steel pipe 7 extends out of the top plane of the tie beam 9.

[0040] In one embodiment of the utility model, a construction method of a composite pile-column bridge pier structure using an internal steel pipe comprises the following steps:

[0041] Prefabrication of UHPC shell and piers; UHPC shell and the first section of pile foundation steel cage are prefabricated together as a whole; the steel pipes and grouting sleeves built into the column are prefabricated together with the concrete layer of the pier;

[0042] The steel pipe piles and steel casing are driven into the site, and the pile foundation is drilled to the designed pile bottom elevation. After the drilling is completed, the pile foundation steel cage is slowly lowered;

[0043] Install the steel box cofferdam, seal the bottom and pump out water, and lower and install the prefabricated UHPC shell;

[0044] The steel bar joints reserved at the bottom of the UHPC shell are connected to the pile foundation steel bars. Before pouring the pile foundation concrete, a PVC pipe is installed on the top of the pile as an extension formwork;

[0045] After the initial setting of the concrete, chisel out the concrete at the pile head, support the formwork and install the tie beam reinforcement, and at the same time, embed the tie beam internal steel pipe, set the tie beam reserved reinforcement and weld it with the reinforcement at the top of the lower pile, and connect it with the grouting sleeve at the bottom of the upper column. After the installation is completed, pour the tie beam concrete;

[0046] After the tie beam construction is completed, the prefabricated pier columns are lowered and installed, the tie beams are connected with grouting sleeves, the built-in steel pipes of the column body and the pre-buried steel pipes of the tie beams are positioned and nested, and the pier column concrete is poured to complete the construction.

[0047] The UHPC shell 1 is restrained by installing a steel clamp 18 , and is supported on a steel casing 17 by the steel clamp 18 to bear the weight of the UHPC shell 1 .

[0048] In one embodiment of the present invention, the steel bar joints 6 are the weak links when the steel bars are subjected to stress, and should be arranged in a staggered manner and the connection length should not be less than 500 mm.

[0049] In one embodiment of the present invention, the height of the steel pipe 9 built into the column is the same as that of the bridge pier.

[0050] In one embodiment of the utility model, the top of the tie beam built-in steel pipe 7 is higher than the top of the tie beam 9, and the diameter of the tie beam built-in steel pipe 7 is smaller than the column body built-in steel pipe 8.

[0051] In one embodiment of the present invention, Figure 5 As shown, 2 to 8 reserved steel bars 15 for the tie beam may be provided, and the number of the grouting sleeves 11 is consistent with the number of reserved steel bars 15 for the tie beam.

[0052] In one embodiment of the utility model, when the conical steel plate 5 is used for pouring pile foundation concrete, the concrete containing impurities at the bottom can smoothly pass through the bottom of the UHPC shell 1, making it convenient to chisel out the concrete at the pile head later.

[0053] In one embodiment of the utility model, the steel clamp 18 is formed by connecting the left and right half clamps together. The left and right half clamps are both semicircular rings, and the two ends of the semicircular rings are bent outward to form a mounting ear each. The left and right half clamps are connected by bolts.

[0054] In one embodiment of the utility model, the UHPC shell 1 is used as a protective layer for the easily eroded parts of the bridge pier, which effectively reduces the damage to the bridge pier caused by seawater erosion, immersion and atmospheric corrosion, and significantly prolongs the service life of the bridge pier.

[0055] Furthermore, the column section stiffness without UHPC is improved by embedding the column built-in steel pipe 8, and the pile column is effectively combined by embedding the column built-in steel pipe 8 with the tie beam reserved steel pipe 7, thereby avoiding damage to the connection between the pile foundation and the bridge pier caused by a sudden change in stiffness.

[0056] In one embodiment of the utility model, during the construction process, the UHPC shell 1 and the pier column concrete layer are all prefabricated sections, and the rest are cast-in-place sections; the pier column concrete layer is connected to the reserved steel bars 15 of the tie beam through the grouting sleeve 11, and the built-in steel pipe 8 of the column body is connected to the built-in steel pipe 7 of the tie beam, thereby achieving the effect of effective connection between the pile and the column; wherein, the construction of the pile-column connection adopts the cofferdam construction of the steel casing 17, the UHPC shell 1 is prefabricated in the factory, and when the UHPC shell 1 is installed, the steel hoop 18 is used to constrain the UHPC shell and is placed in the steel casing 18, thereby supporting the weight of the prefabricated UHPC shell 1.

[0057] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A composite pile-column bridge pier structure using an internal steel pipe, characterized in that: include: A pile foundation (14) comprises pile foundation steel bars (3), the top of the pile foundation steel bars (3) being connected to a first section prefabricated steel cage (4) via a steel bar joint (6); the first section prefabricated steel cage (4) being formed by pouring concrete (2) and a UHPC shell (1); the bottom end of the UHPC shell (1) being prefabricated into a cone, and the bottom end of the UHPC shell (1) being covered with a cone-shaped steel plate (5); the UHPC shell (1) being located at a riverbed; A tie beam (9), the tie beam (9) being installed at the top of the pile foundation (14); being cast after being supported by a formwork of tie beam steel bars (10); and having a tie beam built-in steel pipe (7) and a tie beam reserved steel bar (15) pre-buried in the tie beam (9); A pier column (13), wherein a column shaft built-in steel pipe (8) is pre-buried in the center of the pier column (13), the bottom end of the column shaft built-in steel pipe (8) is arranged outside the tie beam built-in steel pipe (7), and the tie beam built-in steel pipe (7) extends into the bottom of the column shaft built-in steel pipe (8); a grouting sleeve (11) is installed at the bottom of the pier column (13); and the reserved steel bars (15) of the tie beam extend into the grouting sleeve (11).

2. The composite pile-column bridge pier structure with built-in steel pipe according to claim 1, characterized in that: The pile foundation steel bars (3), the first section of prefabricated steel cage (4), the UHPC shell (1) and the conical steel plate (5) are prefabricated into the pile foundation (14) through the concrete.

3. The composite pile-column bridge pier structure with built-in steel pipe according to claim 1, characterized in that: The pile foundation steel bars (3) and the steel bar joints (6) on the first section prefabricated steel bar cage (4) are staggered and have a connection length of not less than 500 mm.

4. The composite pile-column bridge pier structure with built-in steel pipe according to claim 1, characterized in that: A PVC pipe (12) is fixedly installed on the top of the pile foundation (14), and the PVC pipe (12) is used to chisel away the pile head after the concrete pouring of the pile foundation (14) is completed.

5. The composite pile-column bridge pier structure with built-in steel pipe according to claim 1, characterized in that: The tie beam reserved steel bars (15) are centered on the tie beam internal steel pipe (7), and at least two of them are symmetrically arranged in the circumferential direction; the tie beam internal steel pipe (7) and the tie beam reserved steel bars (15) are both placed on the top of the pile foundation (14), and the tie beam reserved steel bars (15) are both welded to the steel cage on the top of the pile foundation (14); the top end of the tie beam internal steel pipe (7) extends out of the top plane of the tie beam (9).

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