A bridge scour protection structure based on natural stones and its construction method

Abstract

The present invention provides a bridge scour protection structure based on natural stones and its construction method. The structure includes a grouting soil treatment layer, a grouting stone treatment layer, and a stone protrusion layer. The grouting soil treatment layer is located within a depth of 30 to 50 cm below the pier pile scour pit. The grouting stone treatment layer is divided into two layers according to the stone particle size and laid within the scour pit around the pier pile to fill the scour pit around the pier pile. The stone particle size of the upper layer is about 40 cm. The stone protrusion layer is located above the grouting stone treatment layer and is an extension of the grouting stone treatment layer above the riverbed. It has certain angular protrusions and the height above the riverbed is preferably 1 / 2 to 2 / 3 of the particle size of the stone in the upper layer of the grouting stone treatment layer. The stone material of the present invention is selected from stones left around the pier pile under the long-term action of the river. The material is easy to obtain, and the stones are bonded together by cement mortar, which has good structural integrity.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering and hydraulic engineering, and in particular to a bridge scour protection structure based on natural stones and a construction method thereof. Background Art

[0002] Scour is a major factor in bridge pile foundation damage. Bridge pile foundations are typically located in complex water environments. Scour can erode the soil surrounding the piles, forming scour pits that seriously threaten the safety and reliability of bridge service. Therefore, selecting cost-effective pile foundation protection structures and construction methods is of vital practical significance for the overall safety of bridges. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a bridge scour protection structure based on natural stones and a construction method thereof in view of the deficiencies of the above-mentioned prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A bridge scour protection structure based on natural stones includes a pile foundation, a riverbed, a scour pit, a grouting soil treatment layer, a grouting stone treatment layer and a stone raised layer; a scour pit is formed around the pile foundation under the action of river scour, and the grouting soil treatment layer is located around the pile foundation below the scour pit; the grouting stone treatment layer is divided into upper and lower layers according to particle size, and both are filled in the scour pit; the stone raised layer is arranged on the upper part of the grouting stone treatment layer, connected to the grouting stone treatment layer as a whole, and the horizontal height of the top of the stone raised layer is greater than the horizontal height of the riverbed.

[0006] As a further preferred embodiment of the present invention, the grouting soil treatment layer is located within a range of 30 to 50 cm below the scouring pit.

[0007] As a further preferred embodiment of the present invention, the grouting stone treatment layer is divided into upper and lower layers according to the selected stone particle size, and the scouring pit is filled and leveled, and the filling height is the same as the height of the riverbed.

[0008] As a further preferred embodiment of the present invention, the average particle size of the upper stone layer of the grouting stone treatment layer is 40 cm, and the particle size of the lower stone layer is selected according to a gradation smaller than the particle size of the upper stone layer.

[0009] As a further preferred embodiment of the present invention, the angular parts of the raised stones in the raised stone layer are exposed on the riverbed surface, and the exposed height is 1 / 2 to 2 / 3 of the particle size of the upper layer of stones in the grouting stone treatment.

[0010] As a further preferred embodiment of the present invention, the raised stones in the raised stone layer are arranged in a plum blossom form.

[0011] A construction method for a bridge scour protection structure based on natural stones,

[0012] Step 1: Extract the accumulated water in the scouring pit to be treated and remove the loose mud and rocks in the scouring pit;

[0013] Step 2: Arrange a plurality of grouting pipes in the scouring pit; wherein the grouting pipes are arranged around the pile foundation; the lower ends of the grouting pipes penetrate into the soil layer at the bottom of the scouring pit, and the upper ends extend out of the riverbed surface;

[0014] Step 3: Fill the scouring pit with stones in two layers according to particle size, while ensuring that the upper layer of stones protrudes a certain height above the riverbed;

[0015] Step 4: Pour cement mortar into the soil layer and stone layer below the scouring pit through the grouting pipe; wherein, the lower soil layer is grouted, and the slurry cements the original loose soil particles into a grouting soil treatment layer by filling, penetrating and compacting; the stone layer is grouted to the same height as the riverbed, and the slurry fills the gaps between the stones, and the two are bonded to form a grouting stone treatment layer; after the grouting stone treatment layer is formed, the stone protrusion layer is equivalent to being embedded in it, and connected with the grouting stone treatment layer to form an overall protective structure.

[0016] As a further preferred embodiment of the present invention, in step 2, the distance between two adjacent grouting pipes is 1.2 to 2 m.

[0017] As a further preferred embodiment of the present invention, in step 4, the grouting pipe is moved from bottom to top within the grouting depth range to carry out grouting construction.

[0018] The present invention has the following beneficial effects:

[0019] Compared with the existing technology, the beneficial effect of the present invention is that it can improve the foundation's anti-scouring ability from many aspects: first, the grouting soil reinforcement layer has a certain reinforcement effect on the soil around the pile foundation, which can effectively reduce the erosion of the soil around the pile foundation by water flow; secondly, the grouting block stone treatment layer can effectively improve the pile foundation's anti-scouring ability by replacing the original soil layer with stones; finally, the stone raised layer has a certain energy dissipation effect on the water flow, which can effectively weaken the scouring effect of the incoming flow on the foundation.

[0020] The stone material of the present invention is selected from stones left around the pile foundation under the long-term action of the river. The material is easy to obtain, and the pile foundation scour protection structure has a strong integrity and can effectively improve the anti-scour ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the pile foundation anti-scour protection structure;

[0022] Figure 2 This is a three-dimensional cross-sectional view of the pile foundation anti-scour protection structure;

[0023] Figure 3 This is the plan view of the pile foundation anti-scour protection structure;

[0024] Figure 4 This is a schematic diagram of the construction process of the pile foundation anti-scour protection structure.

[0025] These include: 1. Scour pit; 2. Riverbed; 3. Pile foundation; 4. Grouting soil treatment layer; 5. Grouting stone treatment layer; 6. Stone raised layer; 7. Grouting pipe. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific preferred embodiments.

[0027] In the description of the present invention, it should be understood that the terms "left side," "right side," "upper," "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Terms such as "first" and "second" do not indicate the importance of components and therefore should not be construed as limitations on the present invention. The specific dimensions used in this embodiment are intended only to illustrate the technical solution and do not limit the scope of protection of the present invention.

[0028] like Figure 1-4 A natural stone bridge scour protection structure and its construction method are shown. The natural stone bridge scour protection structure comprises a grouting soil treatment layer 4, a grouting stone treatment layer 5, and a stone raised layer 6. The grouting soil treatment layer 4 is located within a certain range below the scour pit 1, preferably within 30 to 50 cm below the scour pit 1 of the pile foundation 3, to reinforce the soil within a certain range around the pile foundation 3.

[0029] The grouting stone treatment layer 5 is located on the upper part of the grouting soil treatment layer 4 and is filled in the scouring pit 1 in two layers according to the stone particle size; the stone raised layer 6 is located on the upper part of the grouting stone treatment layer 5, protruding a certain height from the riverbed 2, and is connected to the grouting stone treatment layer 5 as a whole to weaken the scouring effect of water flow on the foundation.

[0030] The grouting stone treatment layer 5 is divided into two layers to fill and level the scour pit 1 according to the selected stone particle size, and the filling height is up to the natural height of the riverbed 2. The upper stone particle size is about 40 cm, and the lower stone particle size can be selected according to a certain gradation smaller than the upper stone particle size.

[0031] The stone raised layer 6 needs to ensure that the angular part of the stone is exposed on the surface of the riverbed 2, and the exposed height is preferably 1 / 2 to 2 / 3 of the particle size of the upper stone in the grouting stone treatment layer 5.

[0032] A method for constructing a bridge scour protection structure based on natural stones comprises the following steps:

[0033] Step 1: extract the accumulated water in the scouring pit 1 to be treated and remove the loose mud and rocks in the scouring pit 1;

[0034] Step 2: Arrange a plurality of grouting pipes 7 in the scouring pit 1; wherein the grouting pipes 7 are arranged around the pile foundation 3; the lower ends of the grouting pipes 7 penetrate into a certain range of soil layer at the bottom of the scouring pit 1, and the upper ends extend out of the surface of the riverbed 2;

[0035] Step 3: Fill the scouring pit 1 with stones in two layers according to their particle size, while ensuring that the upper layer of stones protrudes a certain height above the riverbed 2;

[0036] Step 4: pour cement mortar into the soil layer and stone layer below the scouring pit 1 through the grouting pipe 7; wherein, the lower soil layer is grouted, and the slurry cements the original loose soil particles into a grouting soil treatment layer 4 by filling, penetrating and compacting; the stone layer is grouted to the same height as the riverbed 2, and the slurry fills the gaps between the stones, and the two are bonded to form a grouting stone treatment layer 5; after the grouting stone treatment layer 5 is formed, the protruding part 6 of the stone is equivalent to being embedded in it, and is connected to the grouting stone treatment layer 5 to form an overall protective structure.

[0037] Furthermore, in step 2, the distance between two adjacent grouting pipes 7 is 1.2 to 2 meters. Furthermore, in step 4, the grouting pipes 7 are moved from bottom to top within the grouting depth range to perform grouting construction.

[0038] The present invention can improve the anti-scouring ability of the foundation from many aspects: first, the grouting soil reinforcement layer has a certain reinforcement effect on the soil around the pile foundation 3, which can effectively reduce the erosion of the soil around the pile foundation 3 by the water flow; secondly, the grouting block stone treatment layer can effectively improve the anti-scouring ability of the pile foundation 3 by replacing the original soil layer with stones; finally, the stone raised layer 6 has a certain energy dissipation effect on the water flow, which can effectively weaken the scouring effect of the incoming flow on the foundation.

[0039] The stone material of the present invention is selected from stones left around the pile foundation 3 under the long-term action of the river. The material is easy to obtain, and the scour protection structure of the pile foundation 3 has a strong integrity, which can effectively improve the anti-scour ability.

[0040] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A method for constructing a bridge scour protection structure based on natural stones, wherein: A natural stone-based bridge scour protection structure comprising a pile foundation (3), a riverbed (2), a scour pit (1), a grouting soil treatment layer (4), a grouting stone treatment layer (5), and a stone bulge layer (6); Under the action of river scouring, a scouring pit (1) is formed around the pile foundation (3); a grouting soil treatment layer (4) is located around the pile foundation (3) below the scouring pit (1); a grouting stone treatment layer (5) is divided into upper and lower layers according to particle size, both of which are filled in the scouring pit (1); a stone raised layer (6) is arranged on the upper part of the grouting stone treatment layer (5), connected to the grouting stone treatment layer (5) as a whole, and the horizontal height of the top of the stone raised layer (6) is greater than the horizontal height of the riverbed (2); The construction method includes the following steps: Step 1: extracting the accumulated water in the scouring pit (1) to be treated and removing the loose mud and rocks in the scouring pit (1); Step 2: Arrange a plurality of grouting pipes (7) in the scouring pit (1); wherein the grouting pipes (7) are arranged around the pile foundation (3); the lower ends of the grouting pipes (7) penetrate into the soil layer at the bottom of the scouring pit (1), and the upper ends extend out of the surface of the riverbed (2); Step 3: Fill the scouring pit (1) with stones in two layers according to their particle size, while ensuring that the upper layer of stones protrudes a certain height above the riverbed (2); Step 4: pour cement mortar into the soil layer and stone layer below the scouring pit (1) through the grouting pipe (7); wherein, the lower soil layer is grouted, and the slurry is used to cement the original loose soil particles into a grouting soil treatment layer (4) by filling, penetrating and compacting; the stone layer is grouted to the same height as the riverbed (2), and the slurry fills the gaps between the stones, and the two are bonded to form a grouting stone treatment layer (5); after the grouting stone treatment layer (5) is formed, the stone protrusion layer (6) is equivalent to being embedded in it, and is connected to the grouting stone treatment layer (5) to form an overall protective structure.

2. The method for constructing a bridge scour protection structure based on natural stones according to claim 1, characterized in that: In step 2, the distance between two adjacent grouting pipes (7) is 1.2 to 2 m.

3. The method for constructing a bridge scour protection structure based on natural stones according to claim 1, characterized in that: In step 4, within the grouting depth range, the grouting pipe (7) is moved from bottom to top to perform grouting construction.

4. The method for constructing a bridge scour protection structure based on natural stones according to claim 1, characterized in that: The grouting soil treatment layer (4) is located within a range of 30 to 50 cm below the scouring pit (1).

5. The method for constructing a bridge scour protection structure based on natural stones according to claim 1, characterized in that: The grouting stone treatment layer (5) is divided into upper and lower layers according to the selected stone particle size, and fills the scouring pit (1) to a level height that is the same as the height of the riverbed (2).

6. The method for constructing a bridge scour protection structure based on natural stones according to claim 5, characterized in that: The average particle size of the upper layer of the grouting stone treatment layer (5) is 40 cm, and the particle size of the lower layer of stones is selected according to a gradation smaller than the particle size of the upper layer of stones.

7. The method for constructing a bridge scour protection structure based on natural stones according to claim 1, characterized in that: The angular parts of the raised stones in the raised stone layer (6) are exposed on the surface of the riverbed (2), and the exposed height is 1 / 2 to 2 / 3 of the particle size of the upper layer of stones in the grouting stone treatment.

8. The method for constructing a bridge scour protection structure based on natural stones according to claim 1, characterized in that: The raised stones in the raised stone layer (6) are arranged in a plum blossom shape.

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