Jacking reinforcing structure after bridge pile foundation subsidence

Abstract

The utility model relates to the field of jacking of bridge engineering pile foundations, in particular to a jacking reinforcing structure after sinking of a bridge pile foundation. The problems that after a bridge pile foundation sinks, a main beam is jacked and reset, and the bearing capacity of the pile foundation is insufficient are solved. According to the jacking reinforcing structure, a temporary jacking foundation is combined with temporary jacking equipment, a reinforcing bearing platform is divided into two stages of pouring, the first-stage bearing platform is connected with an original bridge bearing platform to serve as a jacking stress component, the second-stage bearing platform is poured to be connected with a newly-built pile foundation after jacking resetting, and the purposes of jacking and reinforcing the pile foundation are achieved. According to the jacking reinforcing structure after bridge pile foundation subsidence, the bearing platform is subjected to two-stage pouring, first-stage concrete is combined permanently and temporarily, jacking supporting equipment is made of profile steel components and can be recycled, and the jacking reinforcing structure has the beneficial effects of being clear in stress, low in manufacturing cost and high in construction efficiency; the bearing platform concrete is poured in two stages, and the purposes of jacking and resetting of the bridge superstructure and improvement of the bearing capacity of the bridge pile foundation are achieved.

Description

Technical Field

[0001] The utility model relates to the field of jacking of bridge engineering pile foundations, and specifically relates to a jacking and reinforcement structure for bridge pile foundations after settlement. Background Technique

[0002] As an important transportation infrastructure, bridges undertake important tasks of transportation and connection. With the development of the economy and the increase in traffic volume, the usage frequency and load of bridges are also continuously growing. During the long-term use of bridges, due to the influence of various factors such as natural factors, traffic loads, material aging, and construction quality, bridge pile foundations may suffer from diseases such as settlement, cracks, and corrosion. These diseases will reduce the bearing capacity of the bridges, affect the stability and safety of the bridges, and may even lead to bridge collapse accidents, causing huge economic losses and social impacts.

[0003] Pile foundation settlement is a relatively common bridge disease. It refers to the vertical or horizontal displacement of bridge pile foundations under the action of loads due to reasons such as compression, liquefaction, and loss of foundation soil layers, which in turn causes problems such as deformation and cracking of the bridge structure. Pile foundation settlement not only affects the normal use of bridges but also poses a threat to the safety of bridges. Therefore, the research and treatment of bridge pile foundation settlement problems have important practical significance.

[0004] However, in traditional pile foundation reinforcement designs, mainly the pile foundations are reinforced, and the bridge deck is paved and leveled. Paving and leveling the bridge deck increases the secondary dead load and the dead load ratio, which is not conducive to the stress of the main girder. For continuous beams, the vertical displacement of the pile foundation generates additional bending moments on the main girder, affecting the structural stress. Content of the Utility Model

[0005] The utility model provides a jacking and reinforcement structure for bridge pile foundations after settlement, effectively solving the problems of jacking and resetting of the main girder and insufficient bearing capacity of the pile foundations. The jacking and reinforcement structure of this application uses a temporary jacking foundation combined with temporary jacking equipment. The reinforced cap is poured in two phases. The first-phase cap is connected to the original bridge cap and serves as a jacking stress member. After jacking and resetting, the second-phase cap is poured and connected to the newly built pile foundation to achieve the purpose of pile foundation jacking and reinforcement.

[0006] The technical solution of the utility model is specifically as follows:

[0007] A jacking and reinforcement structure for bridge pile foundations after settlement, the jacking and reinforcement structure is based on the jacking and reinforcement of the original bridge, and the jacking and reinforcement structure includes:

[0008] Newly built pile foundations, which are poured on the surrounding foundation of the original bridge;

[0009] Jacking temporary foundations, which are poured and formed on the riverbed;

[0010] A concrete-filled steel tubular column, the concrete-filled steel tubular column is installed on a jacking temporary foundation, and a jack is installed on each concrete-filled steel tubular column;

[0011] A newly built bearing platform, the newly built bearing platform is cast on the original bearing platform of the original bridge;

[0012] Wherein, the newly built bearing platform is supported by newly built pile foundations;

[0013] Wherein, the newly built bearing platform is temporarily supported by a combination of concrete-filled steel tubular columns and jacks.

[0014] Furthermore, the newly built bearing platform includes the first-stage concrete of the bearing platform and the second-stage concrete of the bearing platform;

[0015] Wherein, the first-stage concrete of the bearing platform is cast and formed on the original bearing platform of the original bridge;

[0016] Wherein, the second-stage concrete of the bearing platform is cast and formed on the first-stage concrete of the bearing platform.

[0017] Furthermore, steps should be set at the transverse edges of the first-stage concrete of the bearing platform, and the second-stage concrete of the bearing platform is cast along the steps.

[0018] Furthermore, the combination of the concrete-filled steel tubular columns and the jacks supports the first-stage concrete of the bearing platform.

[0019] Furthermore, the newly built pile foundations support the second-stage concrete of the bearing platform.

[0020] Furthermore, the jacking temporary foundation is arranged in a double row on both sides of the original bridge piles of the original bridge.

[0021] Furthermore, column connection members are arranged between two adjacent concrete-filled steel tubular columns;

[0022] The column connection members are divided into longitudinal connection members and transverse connection members;

[0023] Wherein, the concrete-filled steel tubular columns located on the same jacking temporary foundation are connected by transverse connection members;

[0024] The concrete-filled steel tubular columns 5 between the two jacking temporary foundations 4 on both sides of the original bridge piles 1-3 are connected by longitudinal connection members.

[0025] The beneficial effects of the present utility model are as follows: First, the temporary support can be recycled, saving project costs;

[0026] Second, the bearing platform is cast in two stages, serving both as a permanent load-bearing structure and as a jacking structure;

[0027] Third, after the jacking is completed, the bridge can be restored to the designed alignment to achieve the purpose of resetting.

[0028] Fourth, after the jacking is completed, the newly built pile foundation and the original bridge pile foundation act together to achieve the purpose of improving the bearing capacity of the pile foundation.

[0029] In summary, the jacking and reinforcement structure of the present application realizes the reset of the bridge and the improvement of the bearing capacity of the pile foundation, with high construction efficiency and less capital investment, making the structure have good mechanical properties and certain economic benefits. Description of the Drawings

[0030] Figure 1 It is a schematic elevation view of the jacking and reinforcement structure and the original bridge;

[0031] Figure 2 It is a schematic cross-sectional view of the jacking and reinforcement structure and the original bridge;

[0032] Figure 3 It is a schematic plan view of the jacking and reinforcement structure;

[0033] As shown in the figure: the original bridge 1, the original bridge pier column 1-1, the original bridge cap 1-2, the original bridge pile foundation 1-3, the newly built pile foundation 2, the newly built cap 3, the first-stage concrete of the cap 3-1, the step 3-1-1, the second-stage concrete of the cap 3-2, the jacking temporary foundation 4, the concrete-filled steel tube column 5, the column connection member 6, the longitudinal connection member 6-1, the transverse connection member 6-2, the jack 7, the riverbed 8. Detailed Embodiments

[0034] The technical solutions of the present invention will be further described below in conjunction with the drawings and through specific embodiments:

[0035] Embodiment 1

[0036] Referring to the attached Figures 1 to 3 , the present invention provides a jacking and reinforcement structure for a bridge pile foundation after settlement, aiming to provide a jacking and reinforcement structure for resetting the main girder and improving the bearing capacity of the pile foundation after the settlement of the in-service bridge pile foundation. The jacking and reinforcement structure includes: the newly built pile foundation 2, the newly built cap 3, the jacking temporary foundation 4, the concrete-filled steel tube column 5 and the jack 7.

[0037] The connection method of the newly built pile foundation 2 is the key to the reinforcement project. The newly built pile foundation 2 uses deep mixing or grouting technology to mix with the soil around the original bridge pile foundation 1-3 to form a composite pile foundation, enhancing the overall bearing capacity of the soil. The newly built pile foundation 2 is used to permanently lift the bridge pile foundation.

[0038] As Figure 1 and 3 shown, the jacking temporary foundation 4 is directly poured on the riverbed 8. During the pouring process, it is necessary to ensure the stability of the foundation of the jacking temporary foundation 4. The jacking temporary foundation 4 is poured in two rows on both sides of the original bridge pile foundation 1-3.

[0039] The concrete-filled steel tube column 5 is installed on the jacking temporary foundation 4. To ensure the stability of the support of the concrete-filled steel tube column 5, the concrete-filled steel tube columns 5 located on the same jacking temporary foundation 4 are connected by the transverse connecting member 6-2 of the column connecting member 6, and the concrete-filled steel tube columns 5 on the two jacking temporary foundations 4 on both sides of the original bridge pile foundation 1-3 are connected by the longitudinal connecting member 6-1 of the column connecting member 6.

[0040] The first-stage cap concrete 3-1 is poured on the original bridge cap 1-2 of the original bridge 1. After the first-stage cap concrete 3-1 reaches the design strength, the jack 7 is installed between the first-stage cap concrete 3-1 and the concrete-filled steel tube column 5. Through the synchronous support of the jack 7, the sunken main girder is jacked up and reset.

[0041] As Figure 2 shown, steps 3-1-1 should be set at the transverse edges of the first-stage cap concrete 3-1. After the jacking and resetting are completed, the second-stage cap concrete 3-2 is poured to connect with the new pile foundation 2 and the first-stage cap concrete 3-1.

[0042] The top elevation of the new pile foundation 2 should be determined in combination with the vertical jacking distance to ensure that the bottom elevation of the second-stage cap concrete 3-2 is the same as the top elevation of the new pile foundation 2 after jacking. During jacking, the original bridge pile foundation 1-3 can be partially demolished within the riverbed range, and the structural dimensions can be restored after jacking.

[0043] After the second-stage cap concrete 3-2 reaches the design strength, the temporary foundation 4, the concrete-filled steel tube column 5, the column connecting member 6, and the jack 7 are demolished. The concrete-filled steel tube column 5, the column connecting member 6, and the jack 7 can be reused to reduce the project investment.

[0044] The specific construction method is as follows:

[0045] According to the riverbed line and the distance between the caps, the heights of the concrete-filled steel tube column 5 and the jacking temporary foundation 4 are determined, and the steel tube column 5 and the column connecting member 6 are processed in the factory. During construction, the new pile foundation 2 and the jacking temporary foundation 4 are constructed first. After the jacking temporary foundation 4 reaches the design strength, the concrete-filled steel tube column 5 and the column connecting member 6 are installed. When installing the formwork for the first-stage cap concrete 3-1, attention should be paid to avoiding the installation and jacking positions of the jack 7. After jacking, the second-stage cap concrete 3-2 is poured to connect with the new pile foundation 2 and the first-stage cap concrete 3-1 to achieve the jacking and resetting of the bridge and the reinforcement of the pile foundation.

[0046] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model.

[0047] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A jacking and strengthening structure after the settlement of a bridge pile foundation. The jacking and strengthening structure is based on the jacking and strengthening of the original bridge, and is characterized in that, The jacking and strengthening structure includes: New pile foundations, which are cast in the surrounding foundation of the original bridge; Jacking temporary foundations, which are cast and formed on the riverbed; Concrete-filled steel tubular columns, which are installed on the jacking temporary foundations, and jacks are installed on each concrete-filled steel tubular column; New bearing platforms, which are cast on the original bearing platforms of the original bridge; Among them, the new bearing platform is supported by the new pile foundations; Among them, the new bearing platform is temporarily supported by the combination of concrete-filled steel tubular columns and jacks.

2. The jacking reinforcement structure after the bridge pile foundation sinks according to claim 1, characterized in that: The new bearing platform includes the first-stage concrete of the bearing platform and the second-stage concrete of the bearing platform; Among them, the first-stage concrete of the bearing platform is cast and formed on the original bearing platform of the original bridge; Among them, the second-stage concrete of the bearing platform is cast and formed on the first-stage concrete of the bearing platform.

3. The jacking and strengthening structure after the settlement of a bridge pile foundation according to claim 2, characterized in that, Steps should be set at the transverse edges of the first-stage concrete of the bearing platform, and the second-stage concrete of the bearing platform is cast along the steps.

4. The jacking reinforcement structure after the bridge pile foundation sinks according to claim 2, characterized in that: The combination of the concrete-filled steel tubular columns and jacks supports the first-stage concrete of the bearing platform.

5. The jacking and strengthening structure after the settlement of a bridge pile foundation according to claim 2, characterized in that, The new pile foundations support the second-stage concrete of the bearing platform.

6. A jacking and reinforcement structure for a bridge pile foundation after settlement, according to any one of claims 1-5, characterized in that The jacking temporary foundations are arranged in a double row on both sides of the original bridge piles of the original bridge.

7. The jacking reinforcement structure after the bridge pile foundation sinks according to claim 4, characterized in that: Column connection members are arranged between adjacent pairs of the concrete-filled steel tubular columns; The column connection members are divided into longitudinal connection members and transverse connection members; Among them, the concrete-filled steel tubular columns located on the same jacking temporary foundation are connected by transverse connection members; The concrete-filled steel tubular columns located on two jacking temporary foundations on both sides of the original bridge piles are connected by longitudinal connection members.

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