High-pier bridge foundation structure

Abstract

The utility model discloses a high bridge pier bridge foundation structure, which relates to the field of bridge foundation structure construction and comprises a bridge pier bottom plate, pile foundation structures are respectively constructed and poured on the periphery of the bottom end of the bridge pier bottom plate, and top end reinforcing steel bars of the pile foundation structures and a reinforcing steel bar framework of the bridge pier bottom plate are connected together and are integrally poured through concrete. A middle expanding head structure is poured in the middle of the pile foundation structure through concrete, and a bottom end friction head structure is poured at the bottom end of the pile foundation structure through concrete. And a pile foundation bearing platform is poured and constructed at the top end of the pier bottom plate. Compared with an original vertical pile foundation, the foundation structure has the advantages that the construction time and the construction concrete amount can be saved, and enough bearing capacity is guaranteed to bear the load of the upper part (high bridge pier).

Description

Technical Field

[0001] This utility model relates to the field of bridge foundation structure construction, specifically to the foundation structure of high-pier bridges. Background Technology

[0002] In modern transportation infrastructure construction, high-pier bridges, as an important engineering form spanning deep valleys, rivers, or complex terrain, have foundation construction techniques that directly affect their stability, durability, and safety. As bridge designs become increasingly taller and more complex, the foundation construction of high piers (typically referring to piers exceeding 30 meters in height) faces numerous challenges.

[0003] High bridge pier foundations are often built in soft soil, karst areas, or high seismic intensity zones. Insufficient soil bearing capacity can easily lead to uneven settlement, while horizontal loads (such as wind and earthquakes) significantly increase the requirements for pier stiffness. For example, in soft soil areas, traditional spread foundations may cause pier tilting due to soil compression, necessitating the use of pile foundations or caisson foundations to distribute the load. In karst areas, advanced drilling and grouting reinforcement are required to prevent cavitation and collapse. Pile foundations are a common choice for high bridge piers, with bored piles penetrating soft soil layers to reach stable strata. However, due to the large loads borne by the upper part of high bridge piers, if "vertical piles" are still used, the drilling depth of the pile driver will increase accordingly; furthermore, the later construction of pile foundations involves a large volume and a corresponding increase in concrete, all of which increase construction costs. Utility Model Content

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] The bridge foundation structure of the high pier includes a pier base slab, and pile foundation structures are constructed and poured around the bottom of the pier base slab. The top steel bars of the pile foundation structures are connected to the steel reinforcement skeleton of the pier base slab and are integrally cast with concrete.

[0006] The middle part of the pile foundation structure is provided with a central enlarged head structure by concrete pouring, and the bottom end of the pile foundation structure is provided with a bottom friction head structure by concrete pouring.

[0007] The top of the bridge pier base slab is constructed with a pile foundation cap.

[0008] Preferably, the steel reinforcement cage of the pile foundation cap is tied together with the steel reinforcement of the pier bottom slab, and the concrete of the pile foundation cap and the pier bottom slab is poured together as a single unit.

[0009] Preferably, the pile foundation cap is constructed in a trapezoidal shape.

[0010] Several drainage pipes are pre-embedded and connected in the pile foundation cap.

[0011] Preferably, the top of the pile foundation cap is provided with a cap connecting platform that connects to the high bridge pier;

[0012] The steel reinforcement cage in the pile cap connecting platform is tied together with the steel reinforcement cage of the pile foundation pile cap.

[0013] Preferably, a number of joint connecting steel bars are pre-embedded at the top of the pier connecting platform, and the joint connecting steel bars are used to tie and connect with the bottom steel reinforcement skeleton of the high bridge pier.

[0014] The beneficial effects of this utility model are: the purpose of this utility model is to provide a high pier bridge foundation structure. Compared with the original "vertical pile foundation", this foundation structure can save construction time and the amount of concrete used, and ensure sufficient bearing capacity to withstand the load of the upper (high pier). Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the connection structure of the high pier bridge foundation structure of this utility model;

[0016] In the diagram, 1-pier base plate, 2-pile foundation structure, 3-pile foundation cap, 4-cap connecting platform, 21-middle enlarged head structure, 22-bottom friction head structure, 41-joint connecting steel bar. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] Example 1

[0019] like Figure 1 As shown, this is a high-pier bridge foundation structure. Compared to the original "vertical pile foundation," this foundation structure saves construction time and the amount of concrete required. The foundation structure includes a pier base slab 1, with pile foundation structures 2 cast around its bottom perimeter. The top reinforcement of the pile foundation structures 2 is connected to the reinforcement cage of the pier base slab 1 and integrally cast with concrete. The top of the pile foundation structure 2 is broken off, and the reserved reinforcement is tied to the reinforcement cage of the pier base slab 1. The pier base slab 1 and the top reinforcement of the pile foundation structure 2 are then cast together with concrete (integral casting) to ensure overall load-bearing capacity.

[0020] Meanwhile, the middle part of the pile foundation structure 2 is poured with the intermediate enlarged head structure 21, and the bottom end of the pile foundation structure 2 is poured with the bottom end friction head structure 22. When drilling the pile foundation of the high pier, each pile foundation is drilled to a certain depth (half of the depth of the pile foundation in the embodiment), the position is enlarged by the reamer, and then the drilling is continued to the bottom end, and the bottom end of the drilling is reamed by the reamer; then the reinforcement cage framework of the pile foundation structure 2 (pile foundation) is placed, and the concrete is poured into it, and after pouring and forming, it is roughly the pile foundation structure 2 of the embodiment (with the intermediate enlarged head structure 21 in the middle and the bottom end friction head structure 22 at the bottom end). In this way, at the same pile foundation depth, the pile foundation structure 2 of the application has the intermediate enlarged head structure 21 and the bottom end friction head structure 22, which increases the contact area with the pile hole (after pouring the concrete, the friction between the pile foundation structure and the soil is increased), so that the pile foundation structure 2 has greater bearing capacity at the same depth to bear the external load such as the load of the upper high pier and the climbing formwork for constructing the high pier, thereby saving construction time and ensuring construction safety.

[0021] In addition, the top end of the pier bottom plate 1 is poured with the pile foundation cap 3. The reinforcement cage of the pile foundation cap 3 is bound and connected with the reinforcement of the pier bottom plate 1, and the concrete of the pile foundation cap 3 and the pier bottom plate 1 is integrally poured and constructed. The pile foundation cap 3 is poured and constructed in a trapezoidal structure. The pile foundation cap 3 is designed as a "trapezoidal structure" (generally arranged as a "rectangle"), which can reduce the amount of concrete.

[0022] Embodiment 2

[0023] Based on embodiment 1, the pile foundation cap 3 is pre-buried with a plurality of drainage pipes. Due to the construction of the high pier foundation, which belongs to mass concrete, considering the later maintenance and quality, a plurality of drainage pipes are pre-set in the pile foundation cap 3; when the pile foundation cap 3 is constructed and maintained, water is passed through the drainage pipes and the outer wall is covered and maintained, so as to achieve the maintenance effect of "internal drainage and external preservation", reduce the cracking of the concrete, and ensure the quality of the pile foundation cap 3 (the entire foundation structure).

[0024] Further, the top end of the pile foundation cap 3 is constructed with the cap connecting pedestal 4 connected with the high pier; the reinforcement cage in the cap connecting pedestal 4 is bound and connected with the reinforcement cage of the pile foundation cap 3; and the reinforcement cage in the cap connecting pedestal 4 and the reinforcement cage of the pile foundation cap 3 are integrally poured with concrete, that is, the cap connecting pedestal 4 and the pile foundation cap 3 are integrally poured and connected to ensure the integrity.

[0025] Further, the top end of the bearing platform connecting pedestal 4 is embedded with a plurality of joint connecting steel bars 41, which are used to be tied and connected with the bottom end steel reinforcement framework of the high bridge pier; the plurality of joint connecting steel bars 41 are used to be connected with the bottom end steel reinforcement framework of the high bridge pier to be constructed above, and the bottom end position of the high bridge pier to be constructed above is integrally poured with the bearing platform connecting pedestal 4 through concrete, so as to ensure the connection integrity between them and the bearing capacity.

[0026] The designed pile foundation bearing platform 3 is in a trapezoidal structure, and the bearing platform connecting pedestal 4 is relatively smaller than the pile foundation bearing platform 3. Through such design and construction, the volume of the whole foundation structure is reduced relative to the original "vertical pile foundation structure", the amount of concrete used is also reduced, and thus the cost is also correspondingly reduced.

Claims

1. A high-pier bridge foundation structure comprising a pier base plate, characterized by, The bottom end of the pier bottom plate is respectively constructed and poured with a pile foundation structure, the top end steel bars of the pile foundation structure are connected together with the steel framework of the pier bottom plate and are integrally poured with concrete; The middle part of the pile foundation structure is poured with an intermediate enlarged head structure through concrete, and the bottom end of the pile foundation structure is poured with a bottom end friction head structure through concrete; The top end of the pier bottom plate is constructed and poured with a pile foundation pile cap.

2. The high pier bridge foundation structure according to claim 1, wherein The steel framework of the pile foundation pile cap is connected together with the steel bars of the pier bottom plate and the pile foundation pile cap and the pier bottom plate are integrally poured with concrete.

3. The high pier bridge foundation structure according to claim 2, wherein The pile foundation pile cap is constructed and poured in a trapezoidal structure; The pile foundation pile cap is pre-buried with a plurality of drainage pipes in communication.

4. The high pier bridge foundation structure according to claim 3, wherein The top end of the pile foundation pile cap is constructed with a pile cap connecting pedestal connected with the high pier; The steel framework in the pile cap connecting pedestal is connected together with the steel framework of the pile foundation pile cap by binding.

5. The high pier bridge foundation structure according to claim 4, wherein The top end of the pile cap connecting pedestal is pre-buried with a plurality of joint connecting steel bars, which are used for being connected together with the bottom end steel framework of the high pier by binding.

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