A reinforcing structure for a group pile foundation

Abstract

The utility model belongs to bridge pile foundation platform reinforcing technical field provides a reinforcing structure of group pile foundation, including original pile foundation and original platform still includes: reinforcement cage, reinforcement cage is equipped in the outside of original pile foundation, the outside of reinforcement cage is equipped with glass fiber sleeve, and the lateral wall bottom of glass fiber sleeve is equipped with the hole of grouting pressure, horizontal reinforcement net, horizontal reinforcement net fixedly connected in the reinforcing area of original platform bottom, the bottom of horizontal reinforcement net is provided with CFRP grid, and the bottom of original platform is fixedly equipped with platform sealing template, glass fiber sleeve penetrates platform sealing template, and platform sealing template is sealedly connected with the top of glass fiber sleeve, and the lateral wall of platform sealing template is equipped with the hole of grouting pressure. The utility model can provide rigid annular support for original pile foundation, effectively restrain core concrete transverse expansion, can also solve the problem of bearing capacity degradation caused by slurry leakage in traditional reinforcement.

Description

Technical Field

[0001] This utility model belongs to the field of bridge pile foundation reinforcement technology, and particularly relates to a reinforcement structure for a group pile foundation. Background Technology

[0002] In the reinforcement and renovation of existing bridge pile foundations, the traditional fiberglass sleeve reinforcement technology uses a fiberglass sleeve slightly larger than the cross-sectional size of the pile as a template. Grout is filled between the template and the old pile, and the fiberglass sleeve and grout together form a pile protection system. Although widely used in the repair of damaged pile foundations, it has low passive restraint efficiency, insufficient elongation, and cannot effectively suppress the lateral expansion deformation of concrete. Moreover, the bond strength between the grout and the corroded pile surface is low, the load transfer efficiency is poor, and interlayer delamination is prone to occur, resulting in insufficient recovery of the pile foundation's shear bearing capacity. Utility Model Content

[0003] The purpose of this invention is to provide a reinforcement structure for pile foundations to solve the above-mentioned problems.

[0004] To achieve the above objectives, this utility model provides the following solution: a reinforcement structure for a pile group foundation, comprising the original pile foundation and the original pile cap, and further comprising:

[0005] A reinforcing cage is fitted around the outside of the original pile foundation. A fiberglass sleeve is fitted around the outside of the reinforcing cage, and grouting holes are provided at the bottom of the side wall of the fiberglass sleeve.

[0006] A horizontal steel reinforcement mesh is fixedly connected to the reinforcement area at the bottom of the original foundation. A CFRP mesh is provided at the bottom of the horizontal steel reinforcement mesh. A foundation sealing template is fixedly fitted at the bottom of the original foundation. A fiberglass sleeve penetrates the foundation sealing template and is sealed to the top of the fiberglass sleeve. Grout outlet holes are provided on the side wall of the foundation sealing template.

[0007] Preferably, a number of U-shaped reinforcing bars are fixedly implanted from top to bottom on the outer wall of the original pile foundation, and the bent ends of the U-shaped reinforcing bars abut against the inner wall of the fiberglass sleeve.

[0008] Preferably, the reinforcing cage includes several vertically arranged L-shaped main bars, which are evenly distributed circumferentially on the outside of the original pile foundation. Several annular stiffening hoops are fixedly connected between the L-shaped main bars from top to bottom, and spiral hoops are spirally wound between the L-shaped main bars from top to bottom.

[0009] Preferably, the top of the L-shaped main reinforcement bar is horizontal and located above the horizontal steel reinforcement mesh.

[0010] Preferably, geotextile is laid between the top of the fiberglass sleeve and the bottom of the foundation sealing template for sealing connection.

[0011] Preferably, geotextile is fixedly fitted on the outer wall of the fiberglass sleeve, and several sealing strips are fixedly fitted on the outer side of the geotextile. Geotextile is laid between the bottom and top of the fiberglass sleeve and the foundation sealing template.

[0012] Preferably, a plurality of straight reinforcing bars are implanted at the bottom of the original foundation, and the horizontal reinforcing mesh is fixedly connected to the bottom of the plurality of straight reinforcing bars.

[0013] Preferably, the CFRP mesh adopts a diamond-shaped mesh structure.

[0014] Compared with existing technologies, this utility model has the following advantages and technical effects: The main function of the reinforcing cage is to provide rigid circumferential support and suppress the lateral expansion of the core concrete; the main function of the grouting holes and grout outlet holes is to facilitate pressure grouting, allowing the grouting filler to fill all gaps between the fiberglass sleeve, the foundation sealing template, and the original pile foundation and foundation, ensuring that the grouting filler completely covers the uncorroded surface of the original pile foundation, improving the bonding strength and long-term sealing performance of the new and old materials, and solving the problem of bearing capacity degradation caused by grout leakage in traditional reinforcement; the main function of the CFRP mesh is to enhance the corrosion resistance of the horizontal reinforcing mesh. Overall, the fiberglass sleeve, CFRP mesh, etc. of this utility model are prefabricated, making the construction process simple, fast, and low-cost. By sealing the connection between the foundation sealing template and the fiberglass sleeve, it can ensure that the grouting filler completely covers the uncorroded surface of the original pile foundation and foundation, improving the bonding strength and long-term sealing performance of the new and old materials, and solving the problem of bearing capacity degradation caused by grout leakage in traditional reinforcement. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the reinforcement structure of this utility model;

[0017] Figure 2 This is a schematic diagram showing the connection between the original pile foundation, the reinforcing cage, and the horizontal reinforcing mesh of this utility model;

[0018] Figure 3 This is a schematic diagram of the steel reinforcement cage of this utility model;

[0019] Figure 4This is a schematic diagram of the CFRP mesh of this utility model;

[0020] Among them, 1. original pile foundation; 2. original pile cap; 3. original pier; 4. original pile foundation stirrups; 5. U-shaped embedded steel bars; 6. steel cage; 7. fiberglass sleeve; 8. straight embedded steel bars; 9. horizontal steel mesh; 10. CFRP mesh; 11. pile cap sealing template; 12. sealing strip; 13. geotextile; 14. grouting hole; 15. grout outlet hole; 16. grouting filler; 17. L-shaped main reinforcement; 18. ring stiffening stirrups; 19. spiral stirrups; 20. original pile foundation main reinforcement. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1:

[0024] Reference Figures 1-4 This utility model provides a reinforcement structure for a pile group foundation, including the original pile foundation 1 and the original pile cap 2, and also includes:

[0025] A reinforcing cage 6 is fitted on the outside of the original pile foundation 1. A fiberglass sleeve 7 is fitted on the outside of the reinforcing cage 6. A grouting hole 14 is opened at the bottom of the side wall of the fiberglass sleeve 7.

[0026] A horizontal steel mesh 9 is fixedly connected to the reinforcement area at the bottom of the original foundation 2. A CFRP mesh 10 is provided at the bottom of the horizontal steel mesh 9. A foundation sealing template 11 is fixedly fitted at the bottom of the original foundation 2. A fiberglass sleeve 7 passes through the foundation sealing template 11 and is sealed to the top of the foundation sealing template 11. A grout outlet hole 15 is provided on the side wall of the foundation sealing template 11.

[0027] The main function of the reinforcing cage 6 is to provide rigid circumferential support and suppress the lateral expansion of the core concrete. The main function of the grouting holes 14 and grout outlet holes 15 is to facilitate pressure grouting, allowing the grout filler 16 to fill all gaps between the fiberglass sleeve 7, the foundation sealing template 11, and the original pile foundation 1 and original foundation 2, ensuring that the grout filler 16 completely covers the uncorroded surface of the original pile foundation, improving the bonding strength and long-term sealing performance of the new and old materials, and solving the problem of bearing capacity degradation caused by grout leakage in traditional reinforcement. The main function of the CFRP mesh 10 is to enhance the corrosion resistance of the horizontal reinforcing mesh 9. Overall, the fiberglass sleeve, CFRP mesh, etc. of this utility model are prefabricated, making the construction process simple, fast, and low-cost. By sealing the connection between the foundation sealing template and the fiberglass sleeve, it can ensure that the grout filler completely covers the uncorroded surface of the original pile foundation and original foundation, improving the bonding strength and long-term sealing performance of the new and old materials, and solving the problem of bearing capacity degradation caused by grout leakage in traditional reinforcement.

[0028] like Figure 1 As shown, the original pier 3 is installed on top of the original pier cap 2. The original pile foundation 1 contains the original pile foundation main reinforcement 20 and the original pile foundation stirrups 4.

[0029] To further optimize the scheme, several U-shaped reinforcing bars 5 are fixedly implanted from top to bottom on the outer wall of the original pile foundation 1, and the bent ends of the several U-shaped reinforcing bars 5 abut against the inner wall of the fiberglass sleeve 7.

[0030] like Figure 1 and Figure 2 As shown, by making the bent end of the U-shaped embedded steel bar 5 abut against the inner wall of the fiberglass sleeve 7, it can be ensured that the fiberglass sleeve 7 maintains its assembled position and does not shift during construction.

[0031] Further optimization of the scheme: the steel cage 6 includes several vertically arranged L-shaped main bars 17, the several L-shaped main bars 17 are evenly distributed circumferentially on the outside of the original pile foundation 1, the several L-shaped main bars 17 are fixedly connected from top to bottom with several annular stiffening hoops 18, and the several L-shaped main bars 17 are spirally connected from top to bottom with spiral hoops 19.

[0032] like Figure 3 As shown, several annular stiffening stirrups 18 and spiral stirrups 19 are fixedly connected to several L-shaped main bars 17 by welding. The annular stiffening stirrups 18 and spiral stirrups 19 are orthogonally welded to form a spatial node weld. The node between the annular stiffening stirrups 18 and the spiral stirrups 19 can disperse stress and suppress the lateral expansion of concrete.

[0033] In this embodiment, the L-shaped main rib 17 is made of galvanized stainless steel, further optimizing the design.

[0034] Further optimization of the design resulted in the top of the L-shaped main reinforcement 17 being horizontal and located above the horizontal steel mesh 9.

[0035] like Figure 1 As shown, the top of the L-shaped main reinforcement 17 is bent horizontally and passes through and is positioned close to the horizontal steel mesh 9. After grouting, the bent portion of the L-shaped main reinforcement 17 is embedded in the reinforcement zone of the original pile cap 2, which can effectively enhance the tensile strength of the connection area between the reinforced pile foundation and the pile cap, and improve the overall service life.

[0036] To further optimize the solution, geotextile 13 is laid between the top of the fiberglass sleeve 7 and the bottom of the foundation sealing template 11, and the geotextile 13 is used for sealing connection.

[0037] In a further optimized design, geotextile 13 is fixedly fitted on the outer wall of the fiberglass sleeve 7, and several sealing strips 12 are fixedly fitted on the outer side of the geotextile 13. Geotextile 13 is laid between the bottom and top of the fiberglass sleeve 7 and the foundation sealing template 11.

[0038] like Figure 2 As shown, the fiberglass sleeve 7 is covered with geotextile 13, which completely covers the exterior facade. The outer wall is pressed together by the annular sealing strip 12. The geotextile 13 and the sealing strip 12 form a double sealing connection, forming a composite sealing layer. Combined with the grouting holes 14 on the side wall, it can achieve leak-free pressure grouting from bottom to top.

[0039] Further optimization of the scheme: several straight reinforcing bars 8 are implanted into the bottom of the original foundation 2, and the horizontal steel mesh 9 is fixedly connected to the bottom of the several straight reinforcing bars 8.

[0040] like Figure 2 As shown, the straight-inserted steel bar 8 and the horizontal steel mesh 9 are connected by welding.

[0041] Further optimization of the scheme resulted in CFRP mesh 10 adopting a diamond-shaped mesh structure.

[0042] like Figure 4 As shown, the CFRP mesh 10 can enhance the corrosion resistance of the bottom reinforcement bars (i.e., the bent parts of the horizontal steel mesh 9 and the L-shaped main reinforcement 17) in the reinforcement zone of the original foundation 2.

[0043] The reinforcement dynamic process in this embodiment is as follows:

[0044] After cleaning the surfaces of the original pile foundation 1 and the original pile cap 2, U-shaped reinforcing bars 5 are inserted into the original pile foundation 1, and reinforcing cages 6 are tied tightly to the outer wall of the original pile foundation 1; straight reinforcing bars 8 are inserted into the original pile cap 2, and horizontal reinforcing mesh 9 is fixed to the straight reinforcing bars 8 by spot welding; CFRP mesh 10 is tied to the horizontal reinforcing mesh 9 and below the L-shaped main reinforcing bars 17 extending into the original pile cap 2; fiberglass sleeves 7 are positioned and installed using U-shaped reinforcing bars 5; pile cap sealing template 11 is installed; geotextile 13 is used to seal the connection between the top of the fiberglass sleeve 7 and the bottom of the pile cap sealing template 11, geotextile 13 is used to seal the outer wall and bottom of the fiberglass sleeve 7, and sealing strip 12 is used to seal the outer wall of the fiberglass sleeve 7; pressure grouting is carried out through the grouting holes 14 at the bottom of the side wall of the fiberglass sleeve 7, and the grout filler 16 fills the gap from bottom to top, and the leading edge of the grout pushes the air out from the grout outlet holes 15 at the top of the side wall of the pile cap sealing template 11. The geotextile 13 at the bottom of the fiberglass sleeve 7 expands and fills the micropores under the seepage pressure, and the sealing strip 12 deforms under pressure to strengthen the seal and reduce the construction leakage rate.

[0045] Example 2:

[0046] The difference between this embodiment and Embodiment 1 lies only in that the reinforcing cage 6 includes several vertically arranged L-shaped main bars 17, which are evenly distributed circumferentially on the outside of the original pile foundation 1. Several annular stiffening hoops 18 are fixedly connected between the L-shaped main bars 17 from top to bottom, and a steel mesh is welded to the outside of the L-shaped main bars 17. Specifically, the steel mesh is formed by intersecting and welding longitudinal and transverse steel bars into a planar grid, which is layered and fitted onto the outside of the L-shaped main bars 17 and fixed to the annular stiffening hoops 18 by annular clips.

[0047] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A reinforcement structure for a pile group foundation, comprising the original pile foundation (1) and the original pile cap (2), characterized in that, Also includes: A reinforcing cage (6) is fitted on the outside of the original pile foundation (1). A fiberglass sleeve (7) is fitted on the outside of the reinforcing cage (6). A grouting hole (14) is opened at the bottom of the side wall of the fiberglass sleeve (7). A horizontal steel mesh (9) is fixedly connected to the reinforcement area at the bottom of the original foundation (2). A CFRP mesh (10) is provided at the bottom of the horizontal steel mesh (9). A foundation sealing template (11) is fixedly fitted at the bottom of the original foundation (2). A fiberglass sleeve (7) penetrates the foundation sealing template (11) and the foundation sealing template (11) is sealed to the top of the fiberglass sleeve (7). A grout outlet hole (15) is opened on the side wall of the foundation sealing template (11).

2. The reinforcement structure for a pile foundation according to claim 1, characterized in that: Several U-shaped reinforcing bars (5) are fixedly implanted from top to bottom on the outer wall of the original pile foundation (1), and the bent ends of the several U-shaped reinforcing bars (5) abut against the inner wall of the fiberglass sleeve (7).

3. The reinforcement structure for a pile group foundation according to claim 1, characterized in that: The steel cage (6) includes several vertically arranged L-shaped main bars (17), which are evenly distributed circumferentially on the outside of the original pile foundation (1). Several ring-shaped stiffening hoops (18) are fixedly connected between the L-shaped main bars (17) from top to bottom, and spiral hoops (19) are spirally connected between the L-shaped main bars (17) from top to bottom.

4. The reinforcement structure for a pile group foundation according to claim 3, characterized in that: The top of the L-shaped main bar (17) is horizontal and located above the horizontal steel mesh (9).

5. The reinforcement structure for a pile group foundation according to claim 1, characterized in that: A geotextile (13) is laid between the top of the fiberglass sleeve (7) and the bottom of the foundation sealing template (11) for sealing connection.

6. The reinforcement structure for a pile group foundation according to claim 1, characterized in that: The outer wall of the fiberglass sleeve (7) is fixedly fitted with geotextile (13), and a number of sealing strips (12) are fixedly fitted on the outer side of the geotextile (13). Geotextile (13) is laid between the bottom and top of the fiberglass sleeve (7) and the foundation sealing template (11).

7. The reinforcement structure for a pile group foundation according to claim 1, characterized in that: Several straight reinforcing bars (8) are implanted at the bottom of the original foundation (2), and the horizontal reinforcing mesh (9) is fixedly connected to the bottom of the several straight reinforcing bars (8).

8. The reinforcement structure for a pile group foundation according to claim 1, characterized in that: The CFRP mesh (10) adopts a diamond mesh structure.

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