A concealed anchoring system for bridge and construction method thereof

Abstract

The present invention is applicable to the field of bridge engineering technology, and provides a concealed anchoring system for bridges and a construction method thereof. The anchoring system comprises a main cable channel and a composite anchoring body, wherein the composite anchoring body is located on the side of the mountain away from the bridge; the main cable channel is arranged inside the mountain, and the main cable extends into the composite anchoring body through the main cable channel. The anchoring system of the present invention is located inside the mountain as a whole, and can use the deadweight of the mountain to provide anchoring force. The force is reliable and the cost is more economical than that of conventional gravity anchoring systems. When conditions permit, it can be used as a better alternative for the anchoring system of suspension bridges.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a concealed bridge anchoring system and a construction method thereof. Background Art

[0002] A suspension bridge, also known as a suspension bridge, refers to a bridge that uses cables (or steel chains) suspended by towers and anchored on both sides (or both ends of the bridge) as the main load-bearing components of the superstructure.

[0003] Suspension bridge is a type of bridge structure commonly used to cross wide valleys, and it has a beautiful shape. The anchoring system is an important component of the suspension bridge's force, and the commonly used anchoring types are gravity anchors and tunnel anchors.

[0004] However, the existing anchoring system is expensive, so it is necessary to develop a cost-effective suspension bridge anchoring solution. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a concealed anchoring system for a bridge and a construction method thereof, aiming to solve the problem of high cost of the existing anchoring system.

[0006] The present invention is implemented as follows: a concealed anchoring system for a bridge includes a main cable channel and a composite anchor body, wherein the composite anchor body is located on the side of the mountain away from the bridge; the main cable channel is arranged in the mountain, and the main cable extends into the composite anchor body through the main cable channel.

[0007] Furthermore, the composite anchor body includes an anchor steel ingot, a reinforced concrete anchor pad, a pile foundation and a grouting reinforcement body which are arranged inside the mountain and in sequence from the side of the mountain away from the bridge to the side close to the bridge; a hole is opened in the middle of the anchor steel ingot, and the main cable is fixed with an anchor and a clamp after passing through the hole; the anchor steel ingot is wrapped with anchor concrete.

[0008] Furthermore, the anchoring steel ingot is cylindrical.

[0009] Furthermore, the main cable channel is inclined to the horizontal direction, and an end thereof close to the bridge is higher than an end thereof far from the bridge.

[0010] Furthermore, the main cable channel is constructed in a trenchless manner using jacking pipe or horizontal directional drilling, the inner diameter of the main cable channel is 0.5 to 1.0 m larger than the outer diameter of the main cable, and micro-expansive concrete is poured into the main cable channel.

[0011] Furthermore, the reinforced concrete anchoring pad is cast with high-strength concrete and is provided with multiple layers of force-dispersing steel bars arranged in a horizontal and vertical staggered manner.

[0012] Furthermore, the horizontal and vertical cross-sections of the reinforced concrete anchoring pad are both trapezoidal in shape, with the end close to the anchoring steel ingot being the small cross-section end, and the end close to the pile foundation being the large cross-section end; the cross-sections of the grouting reinforcement body in both the plane and vertical directions are both trapezoidal in shape, with the end close to the pile foundation being the small cross-section end, and the end away from the pile foundation being the large cross-section end.

[0013] Furthermore, the pile foundation serves as a foundation pit supporting structure for the reinforced concrete anchor pad and also as an important force transmitting component; multiple rows of prestressed anchor cables are embedded in the pile foundation, and the multiple rows of prestressed anchor cables extend out of the side of the pile foundation close to the mountain and are anchored into the mountain.

[0014] Furthermore, the grouting reinforcement body is reinforced by injecting slurry through a steel pipe, and the slurry is cement slurry or cement mortar.

[0015] In order to solve the above technical problems, the present invention also provides a construction method of the above bridge concealed anchoring system, which comprises the following steps:

[0016] S1. Construct pile foundation and reserve conditions for the later main cable channel construction;

[0017] S2. Construct grouting reinforcement and reserve conditions for the later main cable channel construction;

[0018] S3, excavate the foundation pit and simultaneously install multiple rows of prestressed anchor cables;

[0019] S4, construction main cable channel;

[0020] S5. Construct reinforced concrete anchor pads and reserve access channels for main cables;

[0021] S6, access to the main cable;

[0022] S7, anchoring the main cable at the anchoring steel ingot;

[0023] S8, construct anchor concrete;

[0024] S9, pouring concrete for the main cable channel;

[0025] S10. Backfill the foundation pit with soil to restore it to its original state.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention proposes a concealed anchoring system for a bridge and a construction method thereof. The anchoring system is entirely located inside a mountain and can utilize the deadweight of the mountain to provide anchoring force. The system is reliable in force bearing and more economical in cost than conventional gravity anchoring systems. When conditions permit, the system can be used as a preferred alternative to the anchoring system for suspension bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the elevation structure of a concealed anchoring system for a bridge provided by an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 An enlarged view of the anchoring system shown at the location of the composite anchor;

[0030] Figure 3 It is a schematic diagram of the planar structure of a concealed anchoring system for a bridge provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] See also Figures 1 to 3 , shows a preferred embodiment of the present invention, a concealed anchoring system for a bridge, including a main cable channel 1 and a composite anchoring body, the composite anchoring body is located on the side of the mountain 200 away from the bridge; the main cable channel 1 is arranged in the mountain 200, and the main cable 100 extends into the composite anchoring body through the main cable channel 1.

[0034] The composite anchor body includes an anchor steel ingot 2, a reinforced concrete anchor pad 3, a pile foundation 4, and a grouting reinforcement body 5, which are arranged inside the mountain 200 and arranged in sequence from the side of the mountain 200 away from the bridge to the side close to the bridge. A hole is opened in the middle of the anchor steel ingot 2, and the main cable 100 is fixed by an anchor and a clamp after passing through the hole; the anchor steel ingot 2 is wrapped by anchor concrete 6. Preferably, the anchor steel ingot 2 is cylindrical.

[0035] The main cable channel 1 is inclined in the horizontal direction, and its end close to the bridge is higher than the end away from the bridge. The main cable channel 1 is designed to be horizontally inclined, and the composite anchor body can be set at the bottom of the mountain 200 as much as possible, so as to maximize the use of the deadweight of the mountain 200 to provide anchoring force.

[0036] The main cable channel 1 is constructed in a trenchless manner by pipe jacking or horizontal directional drilling. The inner diameter of the main cable channel 1 is 0.5 to 1.0 m larger than the outer diameter of the main cable 100. Micro-expansive concrete is poured into the main cable channel 1.

[0037] The reinforced concrete anchor pad 3 is cast with high-strength concrete and is provided with multiple layers of force-dispersing steel bars arranged in a horizontal and vertical staggered manner.

[0038] In order to make the overall shape of the composite anchor body better match the mountain slope and realize the hidden design of the composite anchor body, the horizontal and vertical cross-sections of the reinforced concrete anchor pad 3 are both trapezoidal, with the end close to the anchoring steel ingot 2 being the small cross-section end and the end close to the pile foundation 4 being the large cross-section end. The cross-sections of the grouting reinforcement body 5 in both the plane and vertical directions are trapezoidal, with the end close to the pile foundation 4 being the small cross-section end and the end away from the pile foundation 4 being the large cross-section end.

[0039] The pile foundation 4 serves as a foundation pit support structure for the reinforced concrete anchor pad 3 and also as an important force transmission component. Multiple rows of prestressed anchor cables 7 are embedded in the pile foundation 4, and the multiple rows of prestressed anchor cables 7 extend from the side of the pile foundation 4 close to the mountain 200 and are anchored into the mountain 200.

[0040] The grouting reinforcement body 5 is reinforced by injecting slurry into the steel pipe 8, and the slurry is cement slurry or cement mortar.

[0041] This embodiment also provides a construction method for the above-mentioned bridge concealed anchoring system, which includes the following steps:

[0042] S1, construct pile foundation 4 and reserve conditions for the later construction of main cable channel 1;

[0043] S2, construct grouting reinforcement 5, and reserve conditions for the later construction of main cable channel 1;

[0044] S3, excavating the foundation pit and simultaneously installing multiple rows of prestressed anchor cables 7;

[0045] S4, construction main cable channel 1;

[0046] S5, construct reinforced concrete anchor pad 3, and reserve access channel for main cable 100;

[0047] S6, access to the main cable 100;

[0048] S7, anchoring the main cable 100 at the anchoring steel ingot 2;

[0049] S8, construction of anchor concrete 6;

[0050] S9, pouring concrete for main cable channel 1;

[0051] S10, backfill the foundation pit with soil 9 to restore it to its original state.

[0052] In summary, the present embodiment proposes a concealed anchoring system for a bridge and a construction method thereof, wherein the anchoring system is entirely located within the mountain 200 and can utilize the mountain's own weight to provide anchoring force. The force is reliable and the cost is more economical than conventional gravity anchoring systems. When conditions permit, it can be used as a better alternative to the anchoring system of a suspension bridge.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 concealed anchoring system for a bridge, characterized in that: The invention comprises a main cable channel and a composite anchor body, wherein the composite anchor body is located on the side of the mountain away from the bridge; the main cable channel is arranged in the mountain, and the main cable extends into the composite anchor body through the main cable channel; the composite anchor body comprises an anchoring steel ingot, a reinforced concrete anchoring pad, a pile foundation and a grouting reinforcement body arranged in the mountain and arranged in sequence from the side of the mountain away from the bridge to the side close to the bridge; a hole is opened in the middle of the anchoring steel ingot, and the main cable is fixed by an anchor and a clamp after passing through the hole; the anchoring steel ingot is wrapped by anchoring concrete; the reinforced concrete The horizontal and vertical cross-sections of the soil anchor pad are both trapezoidal in shape, with the end close to the anchoring steel ingot being the small cross-section end, and the end close to the pile foundation being the large cross-section end; the cross-sections of the grouting reinforcement body in both the plane and the vertical directions are both trapezoidal in shape, with the end close to the pile foundation being the small cross-section end, and the end away from the pile foundation being the large cross-section end; the pile foundation serves as a foundation pit support structure for the reinforced concrete anchor pad and also as an important force transmission component; multiple rows of prestressed anchor cables are embedded in the pile foundation, and the multiple rows of prestressed anchor cables extend out of the side of the pile foundation close to the mountain and are anchored into the mountain.

2. The concealed anchoring system for bridges according to claim 1, characterized in that: The anchoring steel ingot is cylindrical.

3. The concealed anchoring system for bridges according to claim 1, characterized in that: The main cable channel is inclined to the horizontal direction, and an end thereof close to the bridge is higher than an end thereof far from the bridge.

4. The concealed anchoring system for bridges according to claim 1, characterized in that: The main cable channel is constructed in a trenchless manner by pipe jacking or horizontal directional drilling. The inner diameter of the main cable channel is 0.5 to 1.0 m larger than the outer diameter of the main cable. Micro-expansive concrete is poured into the main cable channel.

5. The concealed bridge anchoring system according to claim 1, characterized in that: The reinforced concrete anchoring pad is cast with high-strength concrete and is provided with multiple layers of force-dispersing steel bars that are staggered in horizontal and vertical directions.

6. The concealed anchoring system for bridges according to claim 1, characterized in that: The grouting reinforcement body is reinforced by injecting slurry through a steel pipe, and the slurry is cement slurry or cement mortar.

7. A construction method of a concealed bridge anchoring system as claimed in claim 1, characterized in that: The method comprises the following steps: S1. Construct pile foundation and reserve conditions for the later construction of main cable channel; S2. Construct grouting reinforcement and reserve conditions for the later main cable channel construction; S3, excavate the foundation pit and simultaneously install multiple rows of prestressed anchor cables; S4, construction main cable channel; S5. Construct reinforced concrete anchor pads and reserve access channels for main cables; S6, access to the main cable; S7, anchoring the main cable at the anchoring steel ingot; S8, construct anchor concrete; S9, pouring concrete for the main cable channel; S10. Backfill the foundation pit with soil to restore it to its original state.

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