Complex Geological Foundation Reinforcement Method and Structure

Abstract

The present invention discloses a method and structure for reinforcing a complex geological foundation. The complex geology sequentially includes a bedrock layer and a pebble layer from bottom to top. The method for reinforcing the complex geological foundation includes: positioning a pile-forming area on the pebble layer; removing the pebble layer in the pile-forming area and backfilling the soil to form a replacement layer; constructing vibroflotation gravel piles into the bedrock layer along the replacement layer to reinforce the complex geological foundation. The present invention is applicable to the reinforcement of complex geological foundations and can overcome the defect that large buried objects such as large boulders and large pebbles in the complex geological foundation prevent the vibroflotation gravel piles from being blocked by the large buried objects and thus unable to reinforce the complex geological foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and particularly relates to a method and structure for reinforcing a foundation in complex geology. Background Art

[0002] In the field of foundation reinforcement in construction projects, for the reinforcement treatment of soft foundations, vibroflotation gravel piles can be constructed to prevent foundation settlement. A vibroflotation gravel pile refers to a pile body composed of stones formed in the foundation by using the construction technology of the vibration water jet method. The pile and the original foundation soil together form a composite foundation to improve the bearing capacity of the foundation. The method of reinforcing the foundation with vibroflotation gravel piles is generally applicable to soft soil layers, and it has the advantages of simple technology, short pile-forming time, and low construction cost. Please refer to Figure 9 , however, in the face of complex geology where a pebble layer 12 covers a bedrock layer 11, especially when large buried objects such as large boulders and large pebbles are encountered in the pebble layer 12, the vibroflotation gravel piles are blocked by the large buried objects, resulting in the inability to continue constructing downward to the bedrock layer 11, and the foundation in complex geology cannot be reinforced. Therefore, how to reinforce the foundation in the complex geology composed of the bedrock layer and the pebble layer is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method and structure for reinforcing a foundation in complex geology to solve the problem that the above-mentioned complex geological foundation cannot be reinforced.

[0004] To solve the above technical problem, the technical solution provided by the present invention is: a method for reinforcing a foundation in complex geology, the complex geology sequentially includes a bedrock layer and a pebble layer from bottom to top, and the method for reinforcing the complex geological foundation includes: positioning a pile-forming area on the pebble layer; removing the pebble layer in the pile-forming area and backfilling the soil body to form a replacement layer; constructing vibroflotation gravel piles along the replacement layer towards the bedrock layer to reinforce the complex geological foundation.

[0005] Further, in the method for reinforcing a foundation in complex geology provided by the present invention, vibroflotation gravel piles and high-pressure jet grouting piles are constructed along the replacement layer towards the bedrock layer.

[0006] Further, in the method for reinforcing a foundation in complex geology provided by the present invention, the vibroflotation gravel piles and the high-pressure jet grouting piles are constructed overlapping or non-overlapping; or the vibroflotation gravel piles and the high-pressure jet grouting piles are constructed in contact without overlapping or non-overlapping; or the high-pressure jet grouting piles are constructed below the vibroflotation gravel piles.

[0007] Further, in the method for reinforcing a foundation in complex geology provided by the present invention, the pebble layer is a shallow layer, and when the pebble layer is less than the reference depth, it is a shallow layer.

[0008] Furthermore, for the complex geological foundation reinforcement method provided by the present invention, the backfilled soil body is soft soil or sandy soil.

[0009] To solve the above technical problems, another technical solution provided by the present invention is: a complex geological foundation reinforcement structure, where the complex geology sequentially includes a bedrock layer and a pebble layer from bottom to top. A replacement layer is provided in the pile-forming area of the pebble layer, and vibroflotation gravel piles are arranged extending from the replacement layer to the bedrock layer.

[0010] Furthermore, for the complex geological foundation reinforcement structure provided by the present invention, vibroflotation gravel piles and high-pressure jet grouting piles are arranged extending from the replacement layer to the bedrock layer.

[0011] Furthermore, for the complex geological foundation reinforcement structure provided by the present invention, the vibroflotation gravel piles and the high-pressure jet grouting piles are arranged overlapping or non-overlapping; or the vibroflotation gravel piles and the high-pressure jet grouting piles are in contact without overlapping or coinciding; or the high-pressure jet grouting piles are arranged below the vibroflotation gravel piles.

[0012] Furthermore, for the complex geological foundation reinforcement structure provided by the present invention, the pebble layer is shallow, and it is shallow when the pebble layer is less than the reference depth.

[0013] Furthermore, for the complex geological foundation reinforcement structure provided by the present invention, the replacement layer is a soft soil layer or a sandy soil layer.

[0014] Compared with the prior art, the beneficial effects of the above technical solutions of the present invention are as follows:

[0015] The complex geological foundation reinforcement method and structure provided by the present invention remove the pebble layer in the pile-forming area and form a replacement layer by backfilling the soil body to form vibroflotation gravel piles into the bedrock layer, so as to realize the reinforcement treatment of the complex geological foundation. That is to say, the present invention constructs vibroflotation gravel piles for the replacement layer and the bedrock layer in the pile-forming area of the pebble layer to realize the reinforcement treatment of the complex geological foundation; thereby overcoming the defect that large buried objects such as large boulders and large pebbles in the pebble layer prevent the vibroflotation gravel piles from being blocked by the large buried objects and unable to carry out the reinforcement treatment on the above complex geological foundation. In addition, for the complex geological foundation reinforcement method and structure provided by the present invention, since the soil hardness of the replacement layer is less than that of the original pebble layer, the construction progress of the vibroflotation gravel piles can be improved in the replacement layer, so as to achieve the purpose of improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figures 1 to 7 is a schematic cross-sectional structure diagram of the complex geological foundation reinforcement structure of the embodiment of the present invention;

[0017] Figure 8 is a flowchart of the complex geological foundation reinforcement method of the embodiment of the present invention;

[0018] Figure 9 is a schematic cross-sectional structure diagram of a complex geological foundation reinforcement structure of the prior art;

[0019] As shown in the figure:

[0020] 11. Bedrock layer, 12. Cobblestone layer, 13. Vibroflotation gravel pile;

[0021] 110. Bedrock layer, 120. Cobblestone layer, 121. Pile-forming area, 130. Replacement layer, 150. Vibroflotation gravel pile, 160. High-pressure jet grouting pile. Specific implementation manners

[0022] The present invention will be described in detail below with reference to the accompanying drawings:

[0023] Please refer to Figures 1 to 3 , Figure 8 , an embodiment of the present invention provides a complex geological foundation reinforcement method and structure. The embodiment of the present invention is applicable to complex geology, and the complex geology sequentially includes a bedrock layer 110 and a cobblestone layer 120 from bottom to top. The complex geological foundation reinforcement method includes:

[0024] Step 201, position a pile-forming area 121 on the cobblestone layer 120;

[0025] Step 202, remove the cobblestone layer 120 in the pile-forming area 121 and backfill the soil body to form a replacement layer 130;

[0026] Step 203, construct a vibroflotation gravel pile 150 along the replacement layer 130 to the bedrock layer 110 to reinforce the complex geological foundation.

[0027] At this time, the vibroflotation gravel pile 150 and the original foundation can form a composite foundation. Wherein the backfilled soil body can be a soft soil body or sand, etc.

[0028] Please refer to Figures 1 to 3 , the complex geological foundation reinforcement structure provided by the embodiment of the present invention, the complex geology sequentially includes a bedrock layer 110 and a cobblestone layer 120 from bottom to top, a replacement layer 130 arranged in the pile-forming area 121 located in the cobblestone layer 120, and a vibroflotation gravel pile 150 arranged along the replacement layer 130 and extending to the bedrock layer 110.

[0029] The complex geological foundation reinforcement method and structure provided by the embodiments of the present invention construct vibroflotation gravel piles 150 on the bedrock layer 110 by removing the pebble layer 120 in the pile-forming area 121 and backfilling the soil to form a replacement layer 130, so as to realize the reinforcement treatment of the complex geological foundation. That is to say, the embodiments of the present invention realize the reinforcement treatment of the complex geological foundation by constructing the replacement layer 130 in the pile-forming area 121 of the pebble layer 120 and the vibroflotation gravel piles 150 constructed on the bedrock layer 110; thereby overcoming the defect that large buried objects such as large boulders and large pebbles in the pebble layer 120 block the vibroflotation gravel piles 150 and prevent the reinforcement treatment of the above complex geological foundation.

[0030] Please refer to Figures 3 to 5 , for the complex geological foundation reinforcement method provided by the embodiments of the present invention, vibroflotation gravel piles 150 and high-pressure jet grouting piles 160 are constructed along the replacement layer 130 towards the bedrock layer 110. Please refer to Figures 3 to 5 , for the complex geological foundation reinforcement structure provided by the embodiments of the present invention, vibroflotation gravel piles 150 and high-pressure jet grouting piles 160 are constructed along the replacement layer 130 extending to the bedrock layer 110. Please refer to Figures 3 to 5 , the complex geological foundation is reinforced by combining the vibroflotation gravel piles 150 and the high-pressure jet grouting piles 160. The high-pressure jet grouting piles 160 can reinforce the vibroflotation gravel piles 150, so as to stabilize the composite pile foundation composed of the vibroflotation gravel piles 150 and the high-pressure jet grouting piles 160.

[0031] Please refer to Figure 4 , for the complex geological foundation reinforcement method and structure provided by the embodiments of the present invention, the vibroflotation gravel piles 150 and the high-pressure jet grouting piles 160 can be constructed in an overlapping and non-coincident manner; that is, the vibroflotation gravel piles 150 and the high-pressure jet grouting piles 160 are arranged in an overlapping and non-coincident manner. At this time, the vibroflotation gravel piles 150 and the high-pressure jet grouting piles 160 form a superimposed pile, and its stability is better.

[0032] Please refer to Figure 5 , for the complex geological foundation reinforcement method and structure provided by the embodiments of the present invention, the vibroflotation gravel piles 150 and the high-pressure jet grouting piles 160 can be constructed in an overlapping and coincident manner; that is, the vibroflotation gravel piles 150 and the high-pressure jet grouting piles 160 are arranged in an overlapping and coincident manner. At this time, the vibroflotation gravel piles 150 and the high-pressure jet grouting piles 160 form a coincident pile, so that the high-pressure jet grouting piles 160 can reinforce the vibroflotation gravel piles 150, and have the advantage of saving occupied space, and are especially suitable for the environmental space with a small pile-forming area.

[0033] Please refer to Figure 3, for the complex geological foundation reinforcement method and structure provided by the embodiments of the present invention, the vibro gravel pile 150 and the high-pressure jet grouting pile 160 can be constructed in contact without overlapping or coinciding; that is, the vibro gravel pile 150 and the high-pressure jet grouting pile 160 are arranged in contact without overlapping or coinciding. At this time, the high-pressure jet grouting pile 160 can be distributed around the vibro gravel pile 150 to increase the strength of the formed composite pile foundation.

[0034] In order to reduce costs, for the complex geological foundation reinforcement method and structure provided by the embodiments of the present invention, the pebble layer 120 is shallow, and the pebble layer 120 is considered shallow when it is less than the reference depth. The reference depth is 2 meters to 4 meters. That is, the complex geological foundation reinforcement method provided by the embodiments of the present invention is more applicable to relatively shallow pebble layers of the pebble layer 120.

[0035] Please refer to Figures 6 to 7 , for the complex geological foundation reinforcement method provided by the embodiments of the present invention, the high-pressure jet grouting pile 160 is constructed below the vibro gravel pile 150. That is, the high-pressure jet grouting pile 160 is arranged below the vibro gravel pile 150. The vibro gravel pile 150 can be constructed into the replacement layer 130 or into the bedrock layer 110. The high-pressure jet grouting pile 160 below is used to reinforce the vibro gravel pile 150 to increase the strength of the composite pile foundation.

[0036] For the complex geological foundation reinforcement method and structure provided by the embodiments of the present invention, since the soil hardness of the replacement layer is less than that of the original pebble layer, the construction progress of the vibro gravel pile can be improved in the replacement layer, thereby achieving the purpose of improving construction efficiency.

[0037] The present invention is not limited to the above specific embodiments. Any deformation and modification made by those skilled in the art based on the above content fall within the protection scope of the claims of the present invention.

Claims

1. A method for reinforcing complex geological foundations, characterized by The complex geology includes a bedrock layer and a pebble layer in sequence from bottom to top. The method for reinforcing the foundation of the complex geology includes: Locate the pile-forming area on the pebble layer; Remove the pebble layer in the pile-forming area and backfill the soil body to form a replacement layer; Construct vibroflotation gravel piles and high-pressure jet grouting piles along the replacement layer towards the bedrock layer. The vibroflotation gravel piles and the high-pressure jet grouting piles are constructed in an overlapping and coincident manner; or the vibroflotation gravel piles and the high-pressure jet grouting piles are in contact without overlapping or coinciding; or the high-pressure jet grouting piles are constructed below the vibroflotation gravel piles to reinforce the foundation of the complex geology.

2. The complex geological foundation reinforcement method according to claim 1, characterized in that The pebble layer is shallow. When the pebble layer is less than the reference depth, it is shallow.

3. The complex geological foundation reinforcement method according to claim 1, characterized in that The backfilled soil body is soft soil or sandy soil.

4. A complex geological foundation reinforcement structure, characterized in that, The complex geology includes a bedrock layer and a pebble layer in sequence from bottom to top. A replacement layer is provided in the pile-forming area located in the pebble layer. The replacement layer is a soft soil layer or a sandy soil layer. Vibroflotation gravel piles and high-pressure jet grouting piles are provided along the replacement layer extending to the bedrock layer. The vibroflotation gravel piles and the high-pressure jet grouting piles are arranged in an overlapping and coincident manner; or the vibroflotation gravel piles and the high-pressure jet grouting piles are in contact without overlapping or coinciding; or the high-pressure jet grouting piles are arranged below the vibroflotation gravel piles.

5. The complex geological foundation reinforcement structure according to claim 4, characterized in that, The pebble layer is shallow. When the pebble layer is less than the reference depth, it is shallow.

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