Bridge foundation composite reinforcing structure
By adding an enlarged foundation and anchor structure to the bridge foundation, the problem of reduced bearing capacity of the bridge foundation due to hollowing out and softening of the soil layer is solved, and the bearing capacity of the bridge foundation is increased and the service life is extended.
Patent Information
- Application Number
- CN202421048547.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The existing bridge foundation has caused the bottom hollowing out and the soil layer softening due to water flow erosion, natural corrosion, etc., resulting in a decrease in bearing capacity and cannot meet the requirements of continuing operations.
The bridge foundation composite reinforcement structure is adopted, including enlarging the foundation, connecting steel bars, inner rows of anchors and outer rows of anchors. The load sharing area is increased by expanding the foundation, and the bearing capacity of the soil layer at the bottom of the foundation is increased through anchor grouting.
It effectively improves the bearing capacity of the bridge foundation, extends the service life of the bridge structure, and solves the problem of reduced bearing capacity.
Smart Images
Figure CN222349785U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridge reinforcement, in particular to a composite reinforcement structure of a bridge foundation. Background Art
[0002] China currently has more than one million bridges, a large number of which were built in the 1980s and 1990s and have been in use for 30 to 40 years. All of them have problems with defects to varying degrees. The cost of demolition and reconstruction is high, and operating them with defects poses a great safety hazard, so they must be reinforced.
[0003] The foundations of many bridge structures have been hollowed out, the soil has softened, and the pine wood piles or concrete piles have been damaged due to water erosion, natural corrosion and other reasons. The combination of these factors has reduced the bearing capacity of the original bridge foundation and cannot meet the requirements for continued operation, so improvements are needed. Utility Model Content
[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a composite reinforcement structure for a bridge foundation to solve the problems in the prior art.
[0005] The utility model is implemented as follows: a composite reinforcement structure for a bridge foundation comprises: an original bridge foundation, an expanded foundation, connecting steel bars, an inner row of anchor rods and an outer row of anchor rods, wherein the expanded foundation is poured and laid along the edges of the original bridge foundation, the two ends of the connecting steel bars are respectively buried in the original bridge foundation and the expanded foundation, the inner row of anchor rods are laid along the four sides of the original bridge foundation, and the outer row of anchor rods are laid along the four sides of the original bridge foundation and are located on the outside of the inner row of anchor rods.
[0006] Optionally, the interval between two adjacent connecting steel bars is 50 to 100 cm.
[0007] Optionally, the width of the expanded foundation is 1 to 2 m.
[0008] Optionally, the spacing distance between the inner row of anchor rods and the four edges of the original foundation of the bridge is 50 to 100 cm.
[0009] Optionally, the spacing distance between the inner row of anchor rods and the outer row of anchor rods is 1.5m to 3.0m.
[0010] Optionally, inner grouting holes are provided on the inner row of anchor rods.
[0011] Optionally, external grouting holes are provided on the outer row of anchor rods.
[0012] Optionally, the angle between the inner row of anchor rods and the vertical plane is 45° to 75°.
[0013] Optionally, the angle between the outer row of anchor rods and the vertical plane is 45° to 75°.
[0014] Optionally, the inner row of anchor rods and the outer row of anchor rods are arranged in a plum blossom shape.
[0015] The utility model provides a composite reinforcement structure for a bridge foundation, which can not only distribute the upper load pressure by increasing the foundation area, but also improve the bearing capacity of the soil layer at the bottom of the foundation by performing anchor grouting at the bottom of the foundation, thereby forming a foundation reinforcement composite structure, which can effectively improve the bearing capacity of the bridge foundation and extend the service life of the bridge structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A schematic top view of a composite reinforcement structure for a bridge foundation according to an embodiment of the utility model;
[0017] Figure 2 It is a side view schematic diagram of a composite reinforcement structure for a bridge foundation according to an embodiment of the utility model. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0019] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.
[0020] See also Figure 1-2 The present application provides a composite reinforcement structure for a bridge foundation, comprising: an original bridge foundation 1, an expanded foundation 2, connecting steel bars 3, inner row anchor rods 4 and outer row anchor rods 5, wherein the expanded foundation 2 is cast and laid along the edges of the original bridge foundation 1, both ends of the connecting steel bars 3 are respectively buried in the original bridge foundation 1 and the expanded foundation 2, the inner row anchor rods 4 are laid along the four sides of the original bridge foundation 1, and the outer row anchor rods 5 are laid along the four sides of the original bridge foundation 1 and are located on the outside of the inner row anchor rods 4.
[0021] In the embodiment of the present application, the expanded foundation 2 is poured and laid around the original foundation 1 of the bridge, and the two are connected by connecting steel bars 3. The inner row anchor rods 4 and the outer row anchor rods 5 are used to reinforce the structure around the original foundation 1 of the bridge.
[0022] Exemplarily, the spacing between two adjacent connecting steel bars 3 is 15 to 50 cm.
[0023] In the embodiment of the present application, when the interval between two adjacent connecting steel bars 3 is 15 to 50 cm, it can be ensured that the connection between the original foundation 1 and the expanded foundation 2 of the bridge meets the requirements.
[0024] Exemplarily, the width of the expanded foundation 2 is 1 to 2 m.
[0025] In the embodiment of the present application, when the width of the foundation 2 is expanded to 1 to 2 m, the reinforcement effect on the original foundation 1 of the bridge can be enhanced.
[0026] Exemplarily, the distance between the inner row of anchor rods 4 and the edges of the original foundation 1 of the bridge is 50 to 100 cm.
[0027] In the embodiment of the present application, when the spacing distance between the inner row of anchor rods 4 and the four edges of the original foundation 1 of the bridge is 50 to 100 cm, the reinforcement effect on the original foundation 1 of the bridge can be enhanced.
[0028] Exemplarily, the spacing distance between the inner row anchor rods 4 and the outer row anchor rods 5 is 1.5 m to 3.0 m.
[0029] In the embodiment of the present application, when the spacing distance between the inner row of anchor rods 4 and the outer row of anchor rods 5 is 1.5 m to 3.0 m, the reinforcement effect on the original foundation 1 of the bridge can be enhanced.
[0030] Exemplarily, inner grouting holes 41 are provided on the inner row of anchor rods 4 .
[0031] In the embodiment of the present application, the inner grouting holes 41 are used to inject concrete into the inner row of anchor rods 4 .
[0032] Exemplarily, the outer row of anchor rods 5 are provided with outer grouting holes 51 .
[0033] In the embodiment of the present application, the outer grouting holes 51 are used to inject concrete into the outer row of anchor rods 5 .
[0034] Exemplarily, the angle between the inner row of anchor rods 4 and the vertical plane is 45° to 75°.
[0035] In the embodiment of the present application, when the angle between the inner row of anchor rods 4 and the vertical plane is 45° to 75°, it can ensure that concrete is injected into the inner row of anchor rods 4 smoothly.
[0036] Exemplarily, the angle between the outer row of anchor rods 5 and the vertical plane is 45° to 75°.
[0037] In the embodiment of the present application, when the angle between the outer row anchor rods 5 and the vertical plane is 45° to 75°, it can ensure that concrete is injected into the outer row anchor rods 5 smoothly.
[0038] Exemplarily, the inner row of anchor rods and the outer row of anchor rods are arranged in a plum blossom shape.
[0039] The construction steps of a bridge foundation composite reinforcement structure provided in this application are as follows:
[0040] Step 1: Preparation:
[0041] (1) Clean up the garbage around the original bridge foundation 1 and level the surrounding area.
[0042] (2) An inner row of anchor rods 4 are manufactured according to the designed length, and a pair of inner grouting holes 41 with a diameter of 6 mm are opened on the inner row of anchor rods 4 every 20 to 30 cm; an outer row of anchor rods 5 are manufactured, and a pair of outer grouting holes 51 with a diameter of 6 mm are opened on the outer row of anchor rods 5 every 20 to 30 cm.
[0043] Step 2: Drive the anchor:
[0044] (1) The drilling positions are marked out according to the design drawings. The distance between the inner row anchor rods 4 and the edge of the original bridge foundation 1 is 0.5 to 1.0 m, the lateral spacing between adjacent inner row anchor rods 4 is 1.0 to 2.0 m, and the angle a between the inner row anchor rods 4 and the vertical plane is 45° to 75°; the spacing between the outer row anchor rods 5 and the inner row anchor rods 4 is 1 to 2 m, and the angle b between the outer row anchor rods 5 and the vertical plane is 45° to 75°; the inner row anchor rods 4 and the outer row anchor rods 5 are arranged in a plum blossom shape.
[0045] (2) Use a drilling machine to drill holes with a diameter of 10 cm around the original foundation 1 of the bridge. The drilling depth is about 10 cm greater than the length of the anchor rod. Drive in inner row anchor rods 4 and outer row anchor rods 5. The anchor rods are all galvanized steel pipes with a diameter of 52 mm and a wall thickness of not less than 3 mm.
[0046] (3) After driving the inner row anchor rods 4 and the outer row anchor rods 5, the hole opening is closed and the grouting pipe and the exhaust pipe are pre-buried.
[0047] Step 3: Anchor Grouting:
[0048] (1) The concrete mortar at the hole has completed final setting 12 hours after the hole of the anchor bolt is sealed;
[0049] (2) Inject 1:1 cement mortar and add about 5% expansion agent into the anchor rods, and the mortar enters the soil layer below and around the original foundation 1 of the bridge from the inner grouting holes 41 on the inner row anchor rods 4 and the outer grouting holes 51 on the outer row anchor rods 5;
[0050] (3) Continue grouting until the slurry is discharged from the exhaust hole, close the exhaust pipe, and pressurize to 0.5 MPa again before stopping grouting. The grouting of the anchor rod is completed, and the remaining anchor rods can be grouted in this way.
[0051] Step 4: Expand the foundation pour:
[0052] (1) Construction of foundation expansion 2 can only begin 24 hours after anchor grouting is completed;
[0053] (2) Drill holes every 15 to 50 cm around the original foundation 1 of the bridge and implant steel bars with a diameter of 16 mm as connecting bars 3 between the new and old foundations. The implantation depth shall not be less than 15 d (embedded steel bars), and the exposed length shall not be less than 15 d (embedded steel bars). When the casting thickness is greater than 50 cm, double-layer connecting bars 3 shall be provided.
[0054] (3) Pour concrete to expand the foundation 2. The grade of concrete for the expanded foundation 2 shall not be lower than that of the original foundation 1 of the bridge and shall not be lower than C30.
[0055] Step 5: Complete reinforcement:
[0056] The concrete enlarged foundation 2 reaches the age, and the cement slurry used for anchor grouting has reached the age in advance. At this point, the composite reinforced foundation of the bridge is formed.
[0057] The utility model provides a composite reinforcement structure for a bridge foundation, which can not only distribute the upper load pressure by increasing the foundation area, but also improve the bearing capacity of the soil layer at the bottom of the foundation by performing anchor grouting at the bottom of the foundation, thereby forming a foundation reinforcement composite structure, which can effectively improve the bearing capacity of the bridge foundation and extend the service life of the bridge structure.
[0058] The above description is only a preferred embodiment of the present invention, and its structure is not limited to the shapes listed above. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A composite reinforcement structure for a bridge foundation, characterized in that: include: The original foundation of the bridge, the expanded foundation, connecting steel bars, inner row anchor rods and outer row anchor rods, wherein the expanded foundation is poured and laid along the edges of the original foundation of the bridge, the two ends of the connecting steel bars are respectively buried in the original foundation of the bridge and the expanded foundation, the inner row anchor rods are laid along the original foundation of the bridge, and the outer row anchor rods are laid along the original foundation of the bridge and are located on the outside of the inner row anchor rods.
2. The bridge foundation composite reinforcement structure according to claim 1, characterized in that: The spacing between two adjacent connecting steel bars is 15 to 50 cm.
3. The bridge foundation composite reinforcement structure according to claim 1, characterized in that: The width of the expanded foundation is 1 to 2 m.
4. The bridge foundation composite reinforcement structure according to claim 1, characterized in that: The distance between the inner row of anchor rods and the edges of the original foundation of the bridge is 50 to 100 cm.
5. The bridge foundation composite reinforcement structure according to claim 1, characterized in that: The spacing distance between the inner row of anchor rods and the outer row of anchor rods is 1.5m to 3.0m.
6. The bridge foundation composite reinforcement structure according to claim 1, characterized in that: The inner row of anchor rods is provided with inner grouting holes.
7. The bridge foundation composite reinforcement structure according to claim 1, characterized in that: The outer row of anchor rods is provided with outer grouting holes.
8. The bridge foundation composite reinforcement structure according to claim 1, characterized in that: The angle between the inner row of anchor rods and the vertical plane is 45° to 75°.
9. The bridge foundation composite reinforcement structure according to claim 1, characterized in that: The included angle between the outer row of anchor rods and the vertical plane is 45° to 75°.