Riverway revetment construction method

Abstract

The present application relates to a kind of river revetment construction methods, and the combined structure of long pile and short pile interlaced is arranged along river revetment, wherein long pile is divided into two parts, one part is independent, and the other part forms combined pile with short pile;The independent part of long pile is pressed into according to the layout position of river revetment using static pressure method, then the combined pile is pressed into the upper of the independent part of long pile, and the long pile part in the combined pile is connected with the independent part of long pile that has been pressed into to form a whole;The independent part of another long pile is continuously pressed into on the side of short pile in the process, and it is limited and pressed into by using the limiting structure between short pile and the independent part of long pile;Reciprocate, the combined structure of long pile and short pile is pressed into along the layout direction of river revetment;The soil surrounded by short pile in each combined pile is replaced, and the replacement material is material with water permeability.The advantages of the present application are: simple structure, good mechanical properties, convenient construction, superior soil conservation performance and water permeability.

Description

Technical Field

[0001] This invention relates to the field of hydraulic engineering structure technology, and in particular to a method for constructing riverbank protection. Background Technology

[0002] Revetment piles are widely used in inland waterway upgrades and river regulation projects. Precast structures are a popular method for revetment piles, including sheet piles and U-shaped piles, which are already used in many river revetment fields. However, the interlocking of traditional sheet piles relies on concrete tenons and mortises, which is a kind of bonding method and is greatly affected by construction quality, resulting in poor soil retention.

[0003] The existing riverbank protection piles also include pile-slab type protection piles, which involve setting corbels behind the piles, constructing the pile foundation first, and then constructing the protection slab. However, the drainage effect behind the wall is poor between the piles and the slab, resulting in high water pressure behind the wall and a low safety factor. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art by providing a method for constructing riverbank protection, which combines concrete sheet piles and composite sheet piles to achieve the construction of riverbank protection while improving soil retention and permeability.

[0005] The objective of this invention is achieved through the following technical solutions:

[0006] A method for constructing riverbank protection, characterized in that the method includes the following steps:

[0007] A combined structure consisting of alternating long and short piles is installed along the riverbank protection, wherein the long piles are divided into two parts, one part is independent, and the other part forms a combined pile with the short piles.

[0008] The static pressure method is used to press the independent parts of the long pile into the riverbank according to the layout position. Then, the combined pile is pressed into the top of the independent parts of the long pile, and the long pile part in the combined pile is connected to the independent parts of the long pile that have been pressed in to form a whole.

[0009] Continue static pressure construction on one side of the short pile to construct an independent section of another long pile. During this process, the limiting structure between the short pile and the independent section of the long pile is used to limit and press it in.

[0010] This process is repeated, with the combination of long piles and short piles being driven into the riverbank along the direction of the riverbank protection.

[0011] The soil surrounding the short piles within each composite pile is replaced with a material that has a certain degree of permeability.

[0012] The long pile is a concrete sheet pile, and the short pile is a steel sheet pile. The composite pile is composed of concrete sheet pile segments and steel sheet pile segments, wherein the steel sheet pile segments are located on one side of the concrete sheet pile segments and contain two spaced steel plates.

[0013] The ratio of the net width of the concrete sheet pile to that of the steel sheet pile is 1.0-1.2.

[0014] The concrete sheet pile has a rectangular cross-section with a length-to-width ratio of 1.5-2.0; the ratio between the embedded length and the exposed length of the concrete sheet pile is 2:1.

[0015] The spacing between the two steel plates of the sheet pile is 20-30cm, and the ratio between its embedded length and exposed length is 0.3:1.

[0016] The long pile portion of the composite pile is provided with a groove that matches the short pile, and the independent portion of the long pile can be limited by inserting the short pile into its groove.

[0017] Drainage holes are provided on the steel plate, geotextile is placed at the drainage holes, and graded crushed stone wrapped with geotextile is replaced at the two layers of short piles.

[0018] A capping beam is constructed above the combined structure consisting of the long piles and the short piles, to connect the piles into a whole, wherein the short piles are embedded in the capping beam.

[0019] The advantages of this invention are: simple structure, good mechanical properties, convenient construction, and excellent soil retention and permeability. Attached Figure Description

[0020] Figure 1 This is an elevation view of the present invention;

[0021] Figure 2 This is a plan view of the present invention;

[0022] Figure 3 This is a planar structural diagram of the present invention;

[0023] Figure 4 This is a detailed elevation view of the present invention;

[0024] Figure 5 This is a connection structure diagram of the present invention. Detailed Implementation

[0025] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art:

[0026] like Figure 1-5As shown in the figure, each mark represents: concrete sheet pile segment 1, steel sheet pile segment 2, excavation position of riverbed mud surface 3, concrete sheet pile 4, groove 11, outer wall of concrete pile 12, inner wall of concrete pile 13, rubber waterstop 14, drainage hole 21, geotextile 22, rebar hole 23, connecting shear nail 24, connecting short rebar 25, graded sand mixed with crushed stone 26.

[0027] Example: Figures 1 to 5 As shown, the riverbank protection construction method in this embodiment constructs a combined structure consisting of composite sheet piles and concrete sheet piles 4. The composite sheet piles are composed of concrete sheet pile segments 1 and steel sheet pile segments 2. After construction, the concrete sheet pile segments 1 and 4, as components, form long piles, while the steel sheet pile segments 2 are short piles, creating a combined structure of interlocking long and short piles arranged along the riverbank protection direction. The long piles primarily provide stability to the retaining structure through embedding, while the short piles form a retaining and drainage structure to improve permeability.

[0028] The concrete sheet pile segment 1 and the steel sheet pile segment 2 are prefabricated to form an integral structure, with the concrete sheet pile segment 1 slightly higher than the steel sheet pile segment 2 by a certain distance. The concrete sheet pile segment 1 is a hollow rectangular structure with an outer concrete pile wall 12 and an inner concrete pile wall 13, reducing the project cost while ensuring sufficient structural strength and stability. Two rows of grooves 11 are prefabricated on one side of the concrete sheet pile segment 1 in the width direction, and two steel plates of the steel sheet pile segment 2 are prefabricated on the other side in the width direction; the two rows of grooves 11 are matched with the two steel plates, allowing the steel plates to be inserted into the grooves 11.

[0029] Combination Figure 1 and Figure 2 As shown, when several combined sheet piles are combined, the steel sheet pile segment 2 of one combined sheet pile is inserted into the groove 11 opened on the concrete sheet pile segment 1 of another adjacent combined sheet pile, so that each pile foundation interlocks along the revetment direction to form an integral structure.

[0030] In this embodiment, a vertically arranged rubber waterstop 14 is provided inside the groove 11 to make the concrete sheet pile segment 1 and the steel sheet pile segment 2 form a surface contact, thereby achieving the effect of soil retention at the interlocking part of the pile foundation.

[0031] like Figures 3 to 5 As shown, several connecting shear studs 24 are installed at the connection point between the concrete sheet pile segment 1 and the steel sheet pile segment 2 during prefabrication. These connecting shear studs 24 are evenly spaced along the length of the pile to improve the connection performance between the concrete sheet pile segment 1 and the steel sheet pile segment 2. During use, the connecting shear studs 24 are welded to the steel plate of the steel sheet pile segment 2 and are also embedded within the concrete sheet pile segment 1 during prefabrication.

[0032] The concrete sheet pile 4 is located below the composite sheet pile and corresponds to the position of the concrete sheet pile segment 1. The concrete sheet pile 4 and the concrete sheet pile segment 1 are fixedly connected to form an integral structure.

[0033] Combination Figure 3 and Figure 4 As shown, drainage holes 21 are arranged on both sides of the steel plate of the sheet pile segment 2. Geotextile 22 is pasted on the surface of the steel plate at the location of the drainage holes 21 to retain soil. A certain gap is left between the two layers of steel plates of the sheet pile segment 2. After driving, graded sand mixed with crushed stone 26 wrapped with geotextile is filled to improve the drainage performance of the sheet pile.

[0034] Combination Figure 4 and Figure 5 As shown, several reinforcing bar holes 23 are provided at the top of the sheet pile segment 2. These holes 23 are arranged in an array to allow short reinforcing bars 25 to pass through the holes 23 during the construction of the capping beam, forming an integral structure with the capping beam. The capping beam is used to further strengthen and connect several combined sheet piles to form an integral structure. This capping beam can be precast or cast-in-place.

[0035] This embodiment includes the following construction steps during construction:

[0036] 1) The concrete sheet pile 4 is pressed into the riverbank according to the layout position of the riverbank protection using the static pressure method. Then, the combined sheet pile consisting of concrete sheet pile segment 1 and steel sheet pile segment 2 is pressed into the top of the concrete sheet pile 4, and the concrete sheet pile segment 1 is connected to the already pressed concrete sheet pile 4 to form a whole.

[0037] 2) Continue static pressure construction of another concrete sheet pile 4 on one side of the steel sheet pile segment 2. During this process, the already pressed steel sheet pile segment 2 will be used as the positioning reference when the new concrete sheet pile 4 is pressed in. That is, the groove of the newly pressed concrete sheet pile 4 is inserted into the steel sheet pile segment 2. At this time, the newly pressed concrete sheet pile 4 can be guided by the already pressed steel sheet pile segment 2 to ensure its verticality. As the new concrete sheet pile 4 is pressed in, it gradually separates from the steel sheet pile segment 2 and is accurately pressed into the predetermined position.

[0038] After completion, a new composite sheet pile is pressed into the top of the new concrete sheet pile 4 using the same positioning and guiding method to ensure the concentricity between the two and improve the bank protection and retaining effect.

[0039] 3) Repeat this process, pressing in soil sheet pile segments 1 and steel sheet pile segments 2 along the layout direction of the riverbank protection to form a combined sheet pile and a concrete sheet pile 4.

[0040] 4) After construction is completed, the original soil between the two steel sheets of the steel sheet pile segment 2 is removed and replaced with graded sand mixed with crushed stone 26 to improve the soil retention and drainage effect.

[0041] The ratio of the net width (excluding connection width) of concrete sheet piles to steel sheet piles should be between 1.0 and 1.2. This ratio facilitates fabrication and transportation. Since concrete sheet piles primarily provide embedment stability, a ratio that is too small could lead to instability or necessitate additional structural measures. Conversely, excessively wide steel sheet piles could cause buckling instability or require increased steel plate thickness, resulting in uneconomical practices. Therefore, the ratio of concrete sheet piles to steel sheet piles is determined to be 1.0-1.2.

[0042] Concrete sheet piles have a rectangular cross-section with a length-to-width ratio of 1.5-2.0. This ratio results in a wider face on the water-facing side. A ratio that is too large makes the sheet pile too flexible, leading to excessive displacement; a ratio that is too small results in too many joints and increased construction errors. A ratio of 1.5-2.0 reduces the number of joints while ensuring the sheet pile's rigidity, and also facilitates fabrication and transportation. Generally, its length is three times the length of the portion protruding above ground, a standard 2 / 1 ratio for cantilever piles. That is, the pile length above the excavated riverbed mud surface (position 3) is 1 / 3 of the overall pile length, while the pile length below the excavated riverbed mud surface (position 3) is 2 / 3 of the overall pile length. This ratio can also be determined based on geological conditions. The concrete sheet pile provides stability for the embedded structure.

[0043] The length of sheet piles is typically 1.3 times the length protruding above ground, a 0.3:1 embedment ratio. This configuration usually ensures stable seepage in the bottom soil when there is a difference in water level, while also meeting the requirements for retaining soil. If necessary, the embedment ratio of the sheet piles should be determined based on the extreme water level difference to ensure stable seepage and prevent soil erosion.

[0044] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A method for constructing riverbank protection, characterized in that: The construction method includes the following steps: A combined structure consisting of alternating long and short piles is installed along the riverbank protection, wherein the long piles are divided into two parts, one part is independent, and the other part forms a combined pile with the short piles. The static pressure method is used to press the independent parts of the long pile into the riverbank according to the layout position. Then, the combined pile is pressed into the top of the independent parts of the long pile, and the long pile part in the combined pile is connected to the independent parts of the long pile that have been pressed in to form a whole. Continue static pressure construction on one side of the short pile to construct an independent section of another long pile. During this process, the already pressed-in short pile is used as a guide rail to clamp the groove on the independent section of the other long pile onto the already pressed-in short pile, so that the independent section of the other long pile is pressed in along the limiting position of the short pile. This process is repeated, with the combination of long piles and short piles being driven into the riverbank along the direction of the riverbank protection. The soil surrounding the short piles within each composite pile is replaced with a material that has a certain degree of permeability. The long pile is a concrete sheet pile, and the short pile is a steel sheet pile. The composite pile is composed of a concrete sheet pile segment and a steel sheet pile segment. The steel sheet pile segment is located on one side of the concrete sheet pile segment and includes two spaced steel plates. The long pile portion of the composite pile is provided with a groove that matches the short pile, and the independent portion of the long pile is limited by inserting the short pile into its groove; Drainage holes are provided on the steel plate, geotextile is placed at the drainage holes, and graded crushed stone wrapped with geotextile is replaced at the two layers of short piles.

2. The method for constructing riverbank protection according to claim 1, characterized in that: The ratio of the net width of the concrete sheet pile to that of the steel sheet pile is 1.0-1.

2.

3. The method for constructing riverbank protection according to claim 1, characterized in that: The concrete sheet pile has a rectangular cross-section with a length-to-width ratio of 1.5-2.0; the ratio between the embedded length and the exposed length of the concrete sheet pile is 2:

1.

4. The method for constructing riverbank protection according to claim 1, characterized in that: The spacing between the two steel plates of the sheet pile is 20-30cm, and the ratio between its embedded length and exposed length is 0.3:

1.

5. A method for constructing riverbank protection according to claim 1, characterized in that: A capping beam is constructed above the combined structure consisting of the long piles and the short piles, to connect the piles into a whole, wherein the short piles are embedded in the capping beam.

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