Bridge pile foundation underpinning structure

Abstract

The utility model discloses a bridge pile foundation underpinning structure which comprises a bridge, the lower end of the bridge is connected with a pier, the pier is downwards connected with a cross beam, an underpinning beam hole is formed in the middle of the cross beam, a supporting groove is formed in the lower surface of the cross beam, the underpinning beam hole is communicated with the supporting groove, and the lower end of the cross beam is connected with a supporting device. The supporting device is downwards connected with a pile cap, the lower surface of the pile cap is connected with an underpinned pile, the underpinned pile penetrates through the middle of the underpinned pile, and an underpinning jacking jack is arranged between the underpinned pile and the cross beam. By means of the structure, the cross beam and the underpinned pile are jacked open and separated through the underpinning jacking jack, then a new underpinned pile is formed through land drilling and pouring through the underpinning beam hole, and finally the supporting groove is poured to fix the whole structure.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation underpinning construction, in particular to a bridge pile foundation underpinning structure. Background Art

[0002] In cities, bridges and subway lines are often everywhere, so it is inevitable for subways to pass under existing bridges in almost every city, which brings up the issue of bridge pile foundation underpinning. The solutions for pile foundation underpinning are generally pile foundation underpinning and pile foundation protection: Pile foundation underpinning is an active underpinning method. This type of protection is suitable for situations where the pile foundation conflicts with the designed bridge line. Before the construction of the interval bridge passes, the force system of the original pile is converted to the newly built pile foundation, and the original pile foundation is truncated.

[0003] At present, the adaptability of the pile foundation underpinning structure to the uneven settlement of the new and old piles is quite limited. The settlement and deformation of the old piles should be considered to be basically stable in the absence of new influencing factors, while the new underpinning beams and underpinning piles will inevitably produce settlement and deformation after being loaded. Therefore, how to control the settlement and deformation of the underpinning structure is a core issue of pile foundation underpinning. The problem of the bearing capacity and deformation of the underpinning structure is mainly during the construction of the pile foundation underpinning and the use of the structure after the underpinning is completed. The underpinning structure must be sufficiently stable and safe, and the deformation of the underpinned piles and the underpinning structure must be within a safe range. At the same time, the settlement and deformation of the overall upper structure must be within a safe range.

[0004] In addition to the above-mentioned settlement and deformation problems, pile foundation underpinning also has a great impact on the soil of buildings such as bridges passing under it. At present, there are power bridges and various bridges passing through the pile foundation underpinning pile area. Before the replaced piles are cut, the replaced piles have friction on the outside of the bridge passing under them, and the soil pressure of the soil near the pedestal on the bridge passing under them meets the anti-floating design requirements of the original structure. After the replaced piles are cut, the crossbeam is larger and the underpinning piles are far away from the bridge passing under them. The soil pressure of the new pedestal on the soil near the bridge passing under them and the risk of the underpinning piles on the bridge passing under them. Utility Model Content

[0005] The purpose of the utility model is to provide a bridge pile foundation underpinning structure, in which underpinning beams and underpinning piles are arranged to bear the upper load to meet the requirements for shield passage. The ground beam underpinning system no longer needs to modify the bridge structure above the ground during construction, and at the same time solves the problem of stability and safety of the underpinning structure and deformation control within a safe range.

[0006] To achieve the above-mentioned purpose, a bridge pile foundation underpinning structure is provided, including: a bridge, wherein the lower end of the bridge is fixedly connected to the pier, so that the foundation can be deeper into the ground, the pier is fixedly connected downwardly to the crossbeam, so that the foundation can be more stable, a replacement beam hole is arranged in the middle of the crossbeam, so that the underpinning pile can fix the entire bridge, a support groove is arranged on the lower surface of the crossbeam, which is beneficial to maintaining the balance of the entire bridge, the replacement beam hole is connected to the support groove, so that the overall stability of the bridge is stronger, the lower end of the crossbeam is connected to the supporting device, and the supporting device is downwardly connected to the pile cap. The support of the supporting device facilitates the underpinning lifting jack to perform the lifting work, the lower surface of the pile cap is connected to the replaced pile, and the replacement pile passes through the middle, and a replacement lifting jack is arranged between the supporting device and the crossbeam, which is beneficial to the replacement pile and the underpinning pile.

[0007] According to the bridge pile foundation replacement structure, the piers are fixed vertically upward to connect the bridge, and the piers are fixed vertically downward to connect the crossbeams. The I-shape can better maintain the balance of the bridge. The bridge and the crossbeam are parallel to each other, and both the bridge and the crossbeam are parallel to the horizontal plane.

[0008] According to the bridge pile foundation underpinning structure, the underpinning beam hole vertically penetrates the middle of the crossbeam, which is beneficial to the stability of the crossbeam. The underpinning beam hole is provided with a notch along the lower surface of the crossbeam, and the notch connects the supporting groove and the underpinning beam hole. The supporting groove is fixedly connected to the underpinning beam hole through the notch, which can better support the wide crossbeam.

[0009] According to the described bridge pile foundation underpinning structure, a supporting device is provided on the lower surface of the crossbeam, which not only improves the stability of the crossbeam but also makes the underpinning pile more fixed. The upper surface of the supporting device is fixedly connected to the lower surface of the crossbeam, which facilitates the use of a underpinning lifting jack for lifting work. The lower surface of the supporting device is fixedly connected to the upper surface of the pile cap, so that the pile cap has a larger force-bearing area and is subjected to smaller pressure.

[0010] According to the described bridge pile foundation underpinning structure, the underpinning pile passes through the underpinning beam hole and is fixedly connected to the middle of the underpinning beam hole, which facilitates the underpinning pile to drill holes underground to make the foundation. The underpinning pile is fixedly connected to the side of the support groove through the groove on the lower surface of the beam, which can prevent the beam from tilting and causing the bridge to tilt.

[0011] According to the bridge pile foundation underpinning structure, the underpinning lifting jack is composed of a jack base and a jack lifting frame, which can better perform the functions of temporary support and temporary adjustment and lifting of the bridge. The jack lifting frame is connected to the jack base by an air pressure sliding connection with the jack base through an air cylinder inside the jack base, which can reduce the friction between the jack lifting frame and the jack base and extend the service life of the underpinning lifting jack.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention.

[0013] The purpose of the utility model is to provide a bridge pile foundation underpinning structure, the main innovations are:

[0014] 1. The utility model uses the first underpinning structure "underpinned pile" as a temporary underpinning structure to ensure the normal operation of the utility model using the original bridge during the tunnel construction process.

[0015] 2. The utility model utilizes the second underpinning structure of the final underpinning structure, so that the underpinning pile foundation and the permanent underpinning beam are cast into an integral connection. Within the reasonable range of the construction design, the bearing capacity of the pile foundation of the original bridge is transmitted to the bridge through the permanent underpinning beam, and then transmitted to the supporting groove of the beam through the pier, thereby avoiding the settlement of the original pile foundation after underpinning and ensuring the applicability and safety of the engineering construction structure.

[0016] 3. The utility model greatly saves the cost of replacing piles and avoids the uncertain risks caused by the transfer of the bridge load bearing point during the pile replacement process. The construction cost is low and the existing bridge can be guaranteed to be safe and smooth during the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0018] Figure 1 This is a front view of a bridge pile foundation underpinning structure of the utility model;

[0019] Figure 2 This is a bottom view of a bridge pile foundation underpinning structure of the utility model;

[0020] Figure 3 It is a top view of a bridge pile foundation underpinning structure of the utility model;

[0021] Figure 4 The utility model is a cross-sectional view of a beam of a bridge pile foundation underpinning structure.

[0022] Figure 5 The utility model discloses a structural diagram of a supporting lifting jack for a bridge pile foundation supporting structure.

[0023] In the figure: 1. Bridge; 2. Pier; 3. Crossbeam; 4. Support device; 5. Pile cap; 6. Underpinning beam hole; 7. Support groove; 8. Underpinning lifting jack; 9. Jack lifting frame; 10. Jack base; 11. Underpinned pile; 12. Underpinning pile. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1-5 The embodiment of the utility model provides a technical solution: a bridge pile foundation underpinning structure, which includes: a bridge 1, the lower end of the bridge 1 is fixedly connected to the pier 2, so that the foundation can be deeper into the ground, the pier 2 is fixedly connected downwardly to the cross beam 3, so that the foundation can be more stable, a replacement beam hole 6 is arranged in the middle of the cross beam 3, which is convenient for the underpinning pile 12 to fix the entire bridge 1, and a support groove 7 is arranged on the lower surface of the cross beam 3, which is conducive to maintaining the balance of the entire bridge 1, the underpinning beam hole 6 is connected with the support groove 7, so that the overall stability of the bridge 1 is stronger, the lower end of the cross beam 3 is connected to the supporting device 4, and the supporting device 4 is downwardly connected to the pile cap 5. The support of the supporting device 4 facilitates the underpinning lifting jack 8 to perform the lifting work, the lower surface of the pile cap 5 is connected to the replaced pile 11, and the replacement pile 12 passes through the middle, and a replacement lifting jack 8 is arranged between the supporting device 4 and the cross beam 3, which is conducive to the replacement of the replaced pile 11 and the underpinning pile 12.

[0026] The bridge pier 2 is fixed vertically upward to connect the bridge 1, and the bridge pier 2 is fixed vertically downward to connect the cross beam 3. The I-shape can better maintain the balance of the bridge 1. The bridge 1 and the cross beam 3 are parallel to each other, and both the bridge 1 and the cross beam 3 are parallel to the horizontal plane.

[0027] The supporting beam hole 6 vertically passes through the middle of the beam 3, which is beneficial to the stability of the beam 3. A slot is opened along the lower surface of the beam 3, and the slot connects the supporting groove 7 and the supporting beam hole 6. The supporting groove 7 is fixedly connected to the supporting beam hole 6 through the slot, which can better support the wide beam 3.

[0028] A supporting device 4 is provided on the lower surface of the beam 3, which not only improves the stability of the beam 3 but also makes the underpinning pile 12 more fixed. The upper surface of the supporting device 4 is fixedly connected to the lower surface of the beam 3, which facilitates the use of the underpinning jack 8 for jacking work. The lower surface of the supporting device 4 is fixedly connected to the upper surface of the pile cap 5, and the pile cap 5 has a larger force-bearing area and is subjected to smaller pressure.

[0029] The underpinning pile 12 passes through the underpinning beam hole 6 and is fixedly connected to the middle of the underpinning beam hole 6, which facilitates the underpinning pile 12 to drill a hole underground to make a foundation. The underpinning pile 12 is fixedly connected to the side of the support groove 7 through the groove on the lower surface of the beam 3, which can prevent the beam 3 from tilting and causing the bridge 1 to tilt.

[0030] The replacement lifting jack 8 is composed of a jack base 10 and a jack lifting frame 9, which can better perform the functions of temporary support and temporary adjustment of the lifting and lowering of the bridge 1. The jack lifting frame 9 is pneumatically slidably connected to the jack base 10 through the pneumatic cylinder inside the jack base 10, which can reduce the friction between the jack lifting frame 9 and the jack base 10 and extend the service life of the replacement lifting jack 8.

[0031] Working principle: During underpinning, a hole is drilled underground through the underpinning beam hole 6. After the drilling is completed, concrete is poured into the hole through the underpinning beam hole 6, and the concrete fills the support groove 7. After the concrete is completely solidified, the underpinning pile 11, the pile cap 5, and the supporting device 4 can be separated from the beam 3 through the underpinning lifting jack 8. Finally, the underpinning pile 11, the pile cap 5 and the supporting device 4 are dismantled or blasted. During the whole process, there is no need to dismantle the bridge 1, the pier 2, and the beam 3, and there will be no impact or damage to the bridge 1, the pier 2, and the beam 3.

[0032] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A bridge pile foundation underpinning structure, comprising: A bridge (1), characterized in that the lower end of the bridge (1) is fixedly connected to a pier (2), the pier (2) is fixedly connected downwardly to a crossbeam (3), a replacement beam hole (6) is provided in the middle of the crossbeam (3), a support groove (7) is provided on the lower surface of the crossbeam (3), the replacement beam hole (6) is communicated with the support groove (7), the lower end of the crossbeam (3) is connected to a support device (4), the support device (4) is connected downwardly to a pile cap (5), the lower surface of the pile cap (5) is connected to a replaced pile (11), a replacement pile (12) passes through the middle of the crossbeam (3), and a replacement lifting jack (8) is provided between the support device (4) and the crossbeam (3).

2. A bridge pile foundation underpinning structure as claimed in claim 1, characterized in that: The bridge pier (2) is vertically fixedly connected to the bridge (1) upwards, and the bridge pier (2) is vertically fixedly connected to the crossbeam (3) downwards, and the bridge (1) and the crossbeam (3) are parallel to each other.

3. A bridge pile foundation underpinning structure as claimed in claim 1, characterized in that: The underpinning beam hole (6) vertically penetrates the middle of the cross beam (3), a notch is provided on the underpinning beam hole (6) along the lower surface of the cross beam (3), and the supporting groove (7) and the underpinning beam hole (6) connect the notch.

4. A bridge pile foundation underpinning structure as claimed in claim 2, characterized in that: A support device (4) is provided on the lower surface of the cross beam (3), the upper surface of the support device (4) is fixedly connected to the lower surface of the cross beam (3), and the lower surface of the support device (4) is fixedly connected to the upper surface of the pile cap (5).

5. The bridge pile foundation underpinning structure according to claim 1, characterized in that: The underpinning pile (12) passes through the underpinning beam hole (6) and is fixedly connected to the middle of the underpinning beam hole (6); the underpinning pile (12) is fixedly connected to the side of the supporting groove (7) through the notch on the lower surface of the crossbeam (3).

6. The bridge pile foundation underpinning structure according to claim 1, characterized in that: The underpinning lifting jack (8) is composed of a jack base (10) and a jack lifting frame (9), and the jack lifting frame (9) is pneumatically slidably connected to the jack base (10) via a pneumatic cylinder inside the jack base (10).

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