Anti-scouring combined pier

Abstract

The utility model provides an anti-scouring combined bridge pier. The anti-scouring combined bridge pier comprises a lower-layer foundation, a UHPC formwork, tension bands and a bridge pier inner core. The UHPC formwork and the pier inner core are both located on the lower-layer foundation, the pier inner core is formed in an inner cavity of the UHPC formwork in a pouring mode, and a plurality of tension bands are arranged on the outer surface of the UHPC formwork at intervals in the vertical direction in a hooping mode. According to the combined pier, the hoop rings are hooped on the outer surface of the UHPC formwork shell at intervals, the hoop effect is formed through the high tensile property of the hoop rings, the pressure formed by the wet weight of concrete of the inner core of the pier can be resisted, the UHPC formwork shell does not crack in the pouring construction process of the inner core of the pier, and the durability and anti-scouring performance of the pier are guaranteed; meanwhile, due to the existence of the tension bands, the effects of reducing the thickness of the UHPC formwork and saving the material consumption of the UHPC formwork can be achieved, and the manufacturing cost of the pier is well reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bridges, in particular to an anti-scouring combined bridge pier. Background Art

[0002] Ultra-high performance concrete (UHPC) has very superior mechanical properties. Compared with ordinary concrete and high-performance concrete, UHPC has extremely small porosity and dense microstructure due to its extremely low water-cement ratio and reasonable particle grading. It has outstanding advantages in frost resistance, carbonation resistance, chloride ion permeability resistance, sulfate erosion resistance, chemical solution erosion resistance and wear resistance, and has strong durability.

[0003] For bridge piers that need to resist the scouring of water flow, the ultra-strong durability and impermeability of UHPC materials can be utilized, but the pier structure is usually large in size, and the cost of applying UHPC materials to the entire section is high. Therefore, a pier structure with an inner core of ordinary concrete and an outer side of UHPC material came into being. The piers of this structural form use UHPC materials to prefabricate a mold shell, and then pour ordinary concrete inside the mold shell to obtain a pier that combines UHPC materials and ordinary concrete, which effectively reduces the manufacturing cost of the piers. However, in order to resist the pressure formed by the wet weight of the inner core concrete and to ensure that the UHPC mold shell does not crack, the UHPC mold shell is generally set to a thicker thickness in the prior art to resist cracking, but this undoubtedly increases the manufacturing cost of the piers.

[0004] In summary, there is an urgent need for an anti-scour composite pier to solve the problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide an anti-scouring composite bridge pier, aiming to solve the problem that the existing bridge piers combined with UHPC materials and ordinary concrete need to set the UHPC formwork thicker to reduce the risk of cracking, thereby increasing the manufacturing cost of the bridge pier. The specific technical solution is as follows:

[0006] A scour-resistant composite pier comprises a lower foundation, a UHPC formwork, a hoop and a pier core; the UHPC formwork and the pier core are both located on the lower foundation, the pier core is cast in the inner cavity of the UHPC formwork, and a plurality of hoops are arranged on the outer surface of the UHPC formwork along vertical intervals.

[0007] Preferably, in the above technical solution, the pier core is cast in sections by a plurality of UHPC formworks, wherein: a plurality of hoops are arranged on the UHPC formworks on which the pier core is being cast.

[0008] Preferably in the above technical solution, two adjacent UHPC formwork shells are butt-jointed via a male connector and a female connector.

[0009] Preferably in the above technical solution, the upper surface of the lower foundation is provided with a groove, and the lowermost UHPC formwork is inserted into the groove.

[0010] Preferably in the above technical solution, a formwork steel frame is provided in the UHPC formwork, and a pier steel frame is provided in the pier core.

[0011] Preferably in the above technical solution, a corrugated template is provided on the inner side of the UHPC formwork, and bolts are provided on the inner and outer sides of the corrugated template, wherein the bolts located on the inner side extend into the inner core of the pier, and the bolts located on the outer side extend into the UHPC formwork.

[0012] Preferably, in the above technical solutions, the lower foundation includes a pile foundation and a cap, a plurality of the pile foundations are located below the cap, and the UHPC formwork and the pier core are arranged on the cap.

[0013] Preferably in the above technical solution, both ends of the hoop are provided with connecting assemblies, and the two groups of connecting assemblies are connected by a bolt assembly.

[0014] Preferably in the above technical solution, the connecting assembly includes a horizontal plate, a vertical plate and a reinforcing plate, the horizontal plate and the vertical plate form an L-shaped structure, the reinforcing plate is arranged between the horizontal plate and the vertical plate, and the vertical plate is provided with a mounting hole allowing bolts to pass through.

[0015] Preferably in the above technical solution, the width of the hoop is 10-20 cm, and the distance between two adjacent hoops is 0.5 m-1.0 m.

[0016] The application of the technical solution of the utility model has the following beneficial effects:

[0017] In the combined pier of the utility model, hoops are arranged at intervals on the outer surface of the UHPC formwork, and a hoop effect is formed by the high tensile strength of the hoops, which can resist the pressure formed by the wet weight of the concrete in the pier core, so that the UHPC formwork will not crack during the pouring construction of the pier core, thereby ensuring the durability and anti-scouring performance of the pier; at the same time, due to the presence of the hoops, the thickness of the UHPC formwork can be reduced, the amount of UHPC formwork material can be saved, and the manufacturing cost of the pier can be greatly reduced.

[0018] The corrugated formwork can be used as a template for prefabricated UHPC formwork, and the corrugated formwork and the UHPC formwork can be used together as a template for pouring concrete in the inner core of the pier, which can achieve rapid construction and save the cost of pouring the formwork. At the same time, studs are set on both sides of the corrugated formwork, and the studs on both sides can increase the bonding effect between the UHPC formwork and the inner core of the pier to ensure the stability of the connection.

[0019] The hoop is quickly connected through a connecting assembly. After the current casting section of the inner core of the pier is completed, the hoop can be moved to the upper casting section. The hoop can be reused, saving materials and reducing the cost of the pier.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 It is a structural schematic diagram of the utility model anti-scour composite bridge pier;

[0023] Figure 2 yes Figure 1 Sectional view at AA in the middle;

[0024] Figure 3 yes Figure 2 Sectional view at C in the middle;

[0025] Figure 4 yes Figure 1 Sectional view at the middle BB;

[0026] Figure 5 is a schematic diagram of the connection of the hoop end;

[0027] Among them, 1. pile foundation, 2. pedestal, 3. UHPC formwork, 4. hoop, 4.1, connection assembly, 5. support pad stone, 6. casting segment line, 7. pier core, 8. corrugated formwork, 9. first bolt, 10. second bolt. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0030] Example:

[0031] See also Figure 1-Figure 5 The present embodiment provides an anti-scour composite pier, specifically a construction structure of an anti-scour composite pier, including a lower foundation, a UHPC formwork 3, a hoop 4 and a pier core 7; the UHPC formwork 3 and the pier core 7 are both located on the lower foundation, the pier core 7 is located in the inner cavity of the UHPC formwork 3, and a plurality of hoops 4 are provided on the outer surface of the UHPC formwork 3 along vertical intervals.

[0032] Specifically, the pier core 7 is cast in the inner cavity of the UHPC formwork 3, and the UHPC formwork 3 serves as a template for casting the pier core 7; after casting, the pier core 7 and the UHPC formwork 3 form a pier with an integrated structure, and the upper end of the pier is provided with a support pad stone 5 and a support to support the beam structure of the bridge; the hoop 4 is arranged on the outer surface of the UHPC formwork to form a hoop effect, which can resist the pressure formed by the wet weight of the pier core concrete, so that the UHPC formwork will not crack during the casting construction of the pier core, thereby ensuring the durability and anti-scouring performance of the pier; at the same time, due to the presence of the hoop, the thickness of the UHPC formwork can be reduced and the amount of UHPC formwork material can be saved.

[0033] Furthermore, when the height of the pier is too long, the pier core 7 generally needs to be cast in sections (segmented casting is a prior art, and the segmented casting technology is not described in detail in this embodiment. The boundary between the upper and lower layers of casting sections is the casting section line 6). Therefore, in this embodiment, it is preferred that the number of the UHPC formwork 3 is consistent with the number of casting sections of the pier core 7; wherein: a plurality of hoops 4 are hooped on the UHPC formwork 3 where the pier core 7 is being cast. That is, the hoop 4 can be only set on the UHPC formwork 3 where the pier core is being cast. After the pier core is cast in the current UHPC formwork (that is, after the concrete casting reaches the corresponding strength), the hoop 4 can be moved up to the outer surface of the upper layer of the UHPC formwork for hooping. Of course, in some embodiments, it is also possible to directly add a new hoop 4 to the newly added UHPC formwork, rather than moving the hoop on the previous UHPC formwork to the current UHPC formwork.

[0034] Preferably, in this embodiment, the length of a single casting section of the pier core 7 is 3.0 m to 4.0 m.

[0035] See also Figure 4, two adjacent UHPC formworks 3 are butt-jointed by a male head and a female head, and the upper and lower layers of the UHPC formworks 3 are quickly butt-jointed by the male head and the female head. Specifically, the male head and the female head can be a combination of a boss and a groove, wherein the boss is a male head and the groove is a female head, so as to achieve quick butt-jointing. Preferably, the butt-jointing widths of the male head and the female head are equal, and in this embodiment, the butt-jointing width is set to half the thickness of the UHPC formwork 3.

[0036] Please continue to see Figure 4 The upper surface of the lower foundation is provided with a groove, and the bottom UHPC formwork 3 is inserted into the groove to ensure the continuity of the bridge pier at the interface with the lower foundation, so as to enhance the strength of the bridge pier at the interface. Preferably, the depth of the groove on the upper surface of the lower foundation in this embodiment is greater than or equal to 5 cm.

[0037] Preferably, a formwork steel frame is provided in the UHPC formwork 3, and a pier steel frame is provided in the pier core 7. Specifically, the formwork steel frame is a force-bearing structure in the UHPC formwork, and the structural form of the formwork steel frame can be set by those skilled in the art according to actual conditions. Generally, the formwork steel frame includes longitudinal and transverse steel meshes, and the UHPC formwork is specifically cast using ultra-high performance concrete. Similarly, the pier steel frame is also a force-bearing structure in the pier core 7, and the structural form of the pier steel frame can be set by those skilled in the art according to actual conditions. Generally, the pier steel frame includes vertical main bars, outer stirrups and tie bars.

[0038] See also Figure 2-Figure 3 The inner side of the UHPC formwork 3 is provided with a corrugated template 8, and the inner and outer sides of the corrugated template 8 are provided with studs, wherein the studs located on the inner side extend into the pier core 7, and the studs located on the outer side extend into the UHPC formwork 3. Figure 3 As shown, the outer side of the corrugated template 8 is a first bolt 9, and the inner side thereof is a second bolt 10; the first bolt and the second bolt can increase the bonding effect between the UHPC formwork and the inner core of the pier, thereby increasing the stability of the connection; wherein the corrugated template 8 can be used as a casting template for the UHPC formwork.

[0039] Preferably, in this embodiment, the thickness of the UHPC formwork is 0.08-0.12 m, and the outer side of the UHPC formwork is smooth so as to hoop the hoop; the thickness of the corrugated template is 6 mm-10 mm, the wave height is 3.0 cm, the horizontal spacing of the protruding waves is 0.3 m, and a 1.5×3 cm chamfer is set at the same time to facilitate the production of the corrugated template; preferably, the material of the corrugated template is steel.

[0040] See also Figure 5Both ends of the hoop 4 are provided with connecting components 4.1, and the two groups of connecting components 4.1 are connected by bolt assemblies.

[0041] Specifically, the connection assembly 4.1 includes a horizontal plate, a vertical plate and a reinforcing plate, wherein the horizontal plate and the vertical plate form an L-shaped structure, the reinforcing plate is arranged between the horizontal plate and the vertical plate, and the vertical plate is provided with a mounting hole for allowing bolts to pass through. The ends of the horizontal plate and the hoop are fixedly connected (such as welding), and after the two sets of connection assemblies are fixed by a bolt assembly, the hoop tightly embraces the UHPC formwork to form a hoop effect.

[0042] Preferably, the width of the hoop 4 is 10-20 cm, and the distance between two adjacent hoops 4 is 0.5 m-1.0 m. Further preferably, the hoop is made of steel, and the hoop effect is formed by utilizing the high tensile strength of the metal.

[0043] See also Figure 1 and Figure 2 The lower foundation includes a pile foundation 1 and a cap 2, a plurality of the pile foundations 1 are located below the cap 2, the UHPC formwork 3 and the pier core 7 are arranged on the cap 2, a groove is provided on the upper surface of the cap, and the lowest UHPC formwork 3 is inserted into the groove.

[0044] Preferably, the cross-sectional shape of the pier is any one of circular, square, elliptical and curved.

[0045] The construction method of the scour-resistant composite bridge pier in this embodiment is as follows:

[0046] (1) Construction of pile foundations and caps, and pre-embedding of lap steel bars for the pier reinforcement skeleton;

[0047] (2) The corrugated formwork is made in the factory, and studs are welded on both sides of the corrugated formwork to prefabricate the UHPC formwork, which is then transported to the construction site after curing;

[0048] (3) Tighten the hoops on site, hoist the bottom layer of UHPC formwork, and tie the pier reinforcement skeleton;

[0049] (4) Pour the concrete in the core of the pier and cure it until the strength meets the specification requirements;

[0050] (5) Repeat the process of tightening the hoop, hoisting the UHPC formwork, tying the pier steel skeleton, pouring the concrete of the pier core and curing;

[0051] (6) When the bridge pier is constructed to the designed height, the bearing pedestal stone is constructed and the bearing is installed to complete the bridge pier construction.

[0052] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A scour-resistant composite bridge pier, characterized in that: The invention comprises a lower foundation, a UHPC formwork (3), a hoop (4) and a pier core (7); the UHPC formwork (3) and the pier core (7) are both located on the lower foundation, the pier core (7) is cast in the inner cavity of the UHPC formwork (3), and a plurality of hoops (4) are arranged on the outer surface of the UHPC formwork (3) along vertical intervals.

2. The scour-resistant composite bridge pier according to claim 1, characterized in that: The pier core (7) is cast in sections through a plurality of UHPC formworks (3), wherein a plurality of hoops (4) are arranged on the UHPC formworks (3) on which the pier core (7) is being cast.

3. The scour-resistant composite bridge pier according to claim 2, characterized in that: Two adjacent UHPC shells (3) are butt-jointed via a male connector and a female connector.

4. The scour-resistant composite bridge pier according to claim 3, characterized in that: The upper surface of the lower foundation is provided with a groove, and the lowermost UHPC formwork (3) is inserted into the groove.

5. The scour-resistant composite bridge pier according to claim 1, characterized in that: A formwork steel frame is provided in the UHPC formwork (3), and a pier steel frame is provided in the pier inner core (7).

6. The scour-resistant composite bridge pier according to claim 1, characterized in that: A corrugated template (8) is provided on the inner side of the UHPC formwork (3), and bolts are provided on the inner and outer sides of the corrugated template (8), wherein the bolts located on the inner side extend into the pier core (7), and the bolts located on the outer side extend into the UHPC formwork (3).

7. The scour-resistant composite bridge pier according to claim 1, characterized in that: The lower foundation comprises a pile foundation (1) and a capping platform (2), a plurality of the pile foundations (1) are located below the capping platform (2), and the UHPC formwork (3) and the pier core (7) are arranged on the capping platform (2).

8. The scour-resistant composite bridge pier according to any one of claims 1 to 7, characterized in that: Both ends of the hoop (4) are provided with connection assemblies (4.1), and two groups of the connection assemblies (4.1) are connected via a bolt assembly.

9. The scour-resistant composite bridge pier according to claim 8, characterized in that: The connection assembly (4.1) comprises a horizontal plate, a vertical plate and a reinforcing plate, wherein the horizontal plate and the vertical plate form an L-shaped structure, the reinforcing plate is arranged between the horizontal plate and the vertical plate, and the vertical plate is provided with a mounting hole allowing bolts to pass through.

10. The scour-resistant composite bridge pier according to any one of claims 1 to 7, characterized in that: The width of the hoop (4) is 10 to 20 cm, and the distance between two adjacent hoops (4) is 0.5 m to 1.0 m.

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