A precast concrete sheet pile revetment anti-seepage structure and a preparation method thereof

Abstract

The application discloses a precast concrete slab pile revetment anti-seepage structure and a preparation method thereof, wherein the precast concrete slab pile is arranged on the water side of a waterway, is vertically applied and is punched into a foundation, a graded gravel counter-filtration layer is arranged on the outer side of the precast concrete slab pile at a joint position, a geomembrane is arranged on the backwater side of the precast concrete slab pile and is arranged between the precast concrete slab pile and the graded gravel counter-filtration layer, and a cap beam is arranged on the top of the precast concrete slab pile. According to the scheme, the flexible water-permeable counter-filtration layer is arranged behind the precast concrete slab pile, construction is quick and convenient, the flexible water-permeable counter-filtration layer can better adapt to deformation of the slab pile revetment, the problems that rigid water stops such as slot insertion, rotary jetting or grouting are prone to deformation and fracture are solved, the risk of soil leakage at a joint of the revetment is reduced, soil body seepage behind the revetment wall is prevented, water exchange before and after the slab pile revetment wall is realized, the water pressure load borne by the revetment is reduced, and the effect of the revetment anti-seepage is improved and the engineering investment is reduced.

Description

Technical Field

[0001] This invention belongs to the field of waterway engineering, specifically relating to a precast concrete sheet pile bank protection seepage prevention structure and its preparation method. Background Technology

[0002] Continuous pile revetment is a structural type widely used in inland waterway regulation, river management, slope protection and other engineering fields. It involves driving piles arranged longitudinally along the waterway into the soil as the main load-bearing structure, and connecting them with cap beams at the top of the piles to form a whole, thereby achieving the functions of vertical support and protection.

[0003] Diaphragm walls, bored piles, sheet piles, and precast concrete sheet piles are all common revetment structures. Diaphragm walls and bored piles offer good retaining power, but are expensive. The mud slurry walls used during construction are environmentally unfriendly, and the construction period is long. Furthermore, the sealed water-stop structure formed by the walls or piles hinders water exchange on both the upstream and downstream sides. Sheet piles are relatively quick to construct and have less environmental impact, but they have lower stiffness, larger relative deformation and displacement, and weaker cross-sectional bearing capacity. For higher retaining walls, anchoring structures are required at the rear. Precast concrete sheet piles retain the advantages of fast construction and low environmental impact of sheet piles, while offering improved stiffness and strength, making them highly suitable as revetment structures for waterway improvement and river management in plain areas.

[0004] Precast concrete sheet piles require individual pile driving, inevitably resulting in pile joints. Combined with pile misalignment during construction, improper handling of these joints can lead to soil leakage and erosion, compromising the safety of structures behind the revetment. Common methods for handling precast sheet pile joints include: installing tenons or slots at the joints; constructing high-pressure jet grouting piles at the joints behind the sheet pile wall; or grouting into the holes between the piles.

[0005] While these methods can solve the problem of soil seepage, they also completely seal the gaps between the piles, making it difficult to effectively achieve water exchange on the back side of the piles. This is not conducive to lowering the water level behind the pile wall, increases the water pressure load on the piles, and leads to increased project investment. Furthermore, since sheet pile revetments inevitably have uneven vertical deformation along the horizontal direction, rigid waterstops such as slots, jet grouting piles, or grouting are prone to deformation and breakage, increasing the risk of soil leakage from the piles. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a precast concrete sheet pile revetment seepage prevention structure and its preparation method.

[0007] The specific technical solution for achieving the objective of this invention is as follows:

[0008] A precast concrete sheet pile bank protection seepage prevention structure includes precast concrete sheet piles, graded crushed stone filter layer, impermeable geotextile and cap beam;

[0009] The precast concrete sheet pile revetment structure is set on the water-facing side of the waterway. The precast concrete sheet piles are set on the water-facing side of the waterway and driven vertically into the foundation. A graded crushed stone filter layer is set on the outer side of the precast concrete sheet pile at the joint position.

[0010] The impermeable geotextile is installed on the backwater side of the precast concrete sheet pile and between the precast concrete sheet pile and the graded crushed stone filter layer.

[0011] The cap beam is set on top of the precast concrete sheet pile.

[0012] This solution also provides a method for preparing the above-mentioned precast concrete sheet pile revetment seepage prevention structure, including the following steps:

[0013] Step 1: Prepare the prefabricated steel channel;

[0014] Step 2: Install impermeable geotextile in the precast steel trough;

[0015] Step 3: Prepare precast concrete sheet piles and place them in the required locations;

[0016] Step 4: Sink the precast steel trough with impermeable geotextile into the precast concrete sheet pile, and use the precast steel trough to set a graded crushed stone filter layer.

[0017] Step 5: Pull out the precast steel channel and install a cap beam on top of the precast concrete sheet pile to complete the preparation of the seepage prevention structure.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention provides a precast concrete sheet pile revetment seepage prevention structure and its preparation method. By setting a flexible permeable filter layer behind the precast concrete sheet piles, construction is quick and convenient. The flexible permeable filter layer can better adapt to the deformation of the sheet pile revetment, solving the problem that rigid waterstops such as slots, jet grouting piles or grouting are prone to deformation and breakage. It reduces the risk of soil leakage at the joints of the revetment, prevents soil seepage behind the revetment wall, realizes water exchange before and after the sheet pile revetment wall, reduces the water pressure load on the revetment, and is more conducive to improving the seepage prevention effect of the revetment and reducing project investment.

[0020] This scheme, while fulfilling the seepage prevention function of precast concrete sheet pile revetment, selects flexible permeable material as the filter layer. The material is conventional, the construction is quick and convenient, which is more conducive to improving the seepage prevention effect of the revetment and reducing the project investment.

[0021] The present invention will be further described below with reference to specific embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic cross-sectional view of the precast concrete sheet pile revetment seepage prevention structure in this scheme.

[0023] Figure 2 This is a plan view of the precast concrete sheet pile revetment seepage prevention structure of this scheme.

[0024] Figure 3 This is a schematic diagram of the prefabricated steel trough in this scheme.

[0025] Figure 4 This is a longitudinal section view of the precast steel trough in this scheme.

[0026] Figure 5 This is a cross-sectional view of the precast steel trough in this scheme.

[0027] Figure 6 This is a schematic diagram showing the fixing of the impermeable geotextile before and after embedding it into the V-shaped steel groove in this scheme.

[0028] Figure 7 This is a schematic diagram of the connection between the impermeable geotextile and the plain round steel bars in this scheme. Detailed Implementation

[0029] Example

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0032] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0033] Combination Figures 1 to 7 A precast concrete sheet pile bank protection seepage prevention structure includes precast concrete sheet piles, graded crushed stone filter layer, seepage-proof geotextile and cap beam;

[0034] The precast concrete sheet pile revetment structure is installed on the water-facing side of the waterway. The precast concrete sheet piles are installed on the water-facing side of the waterway and driven vertically into the foundation. In this embodiment, the sheet pile width is between 0.4 and 0.8 meters. Each sheet pile is arranged closely together in a row, with a structural section every 10-15 meters longitudinally. A graded crushed stone filter layer is installed between the piles and the pile joints on the outer side of the precast concrete sheet piles. Generally, the graded crushed stone filter layer is 0.3-0.4 meters wide along the waterway flow direction and 0.1-0.15 meters wide perpendicular to the waterway flow direction. The top elevation is consistent with the top of the sheet piles, and the bottom elevation is 1 meter below the bottom elevation of the waterway. The particle size of the graded crushed stone is 0.5-2 cm.

[0035] The impermeable geotextile is installed on the backwater side of the precast concrete sheet pile and between the precast concrete sheet pile and the graded crushed stone filter layer. The impermeable geotextile selected in this scheme has a specification of 400g / cm². 2 ;

[0036] The cap beam is set on top of the precast concrete sheet pile.

[0037] This solution also provides a method for preparing the above-mentioned precast concrete sheet pile revetment seepage prevention structure, including the following steps:

[0038] Step 1: Prepare a prefabricated steel channel, such as... Figure 3-5 As shown:

[0039] The prefabricated steel channel includes a first steel plate, a second steel plate, a third steel plate, and a V-shaped steel slot;

[0040] The first steel plate comprises two pieces, the two first steel plates are symmetrically arranged perpendicular to the ground, and a second steel plate is arranged horizontally between the two first steel plates and perpendicular to the ground;

[0041] A third steel plate is placed on the second steel plate and between the two first steel plates. The third steel plate is at an angle to the ground and can be set perpendicular to the ground or not perpendicular to the ground. The third steel plate is perpendicular to the two first steel plates and is connected to the second steel plate at a certain oblique angle.

[0042] A V-shaped steel groove is welded to one side of the two first steel plates near the third steel plate;

[0043] The first steel plate, the second steel plate, and the third steel plate are welded together to form a prefabricated steel channel.

[0044] In addition, one end of each of the two first steel plates is cut at a preset slope to form an angle; the slot opening of the V-shaped steel slot faces the angle.

[0045] Step 2: Install impermeable geotextile in the precast steel trough:

[0046] A first plain round steel bar is provided at the end of the first steel plate on the non-oblique side, and a second plain round steel bar covered with impermeable geotextile is provided in the V-shaped steel groove of the first steel plate. The other end of the impermeable geotextile is fixedly connected to the second plain round steel bar.

[0047] The impermeable geotextile is folded in half and then placed on the second plain round steel bar. After being straightened towards the first plain round steel bar, the edge of the impermeable geotextile is fixed to the first plain round steel bar.

[0048] Step 3: Prepare precast concrete sheet piles and place them in the required locations;

[0049] The precast concrete sheet piles are driven into the preset position. After the piles are driven into the preset position, the top of the precast concrete sheet piles is leveled and a graded crushed stone filter layer of a certain thickness is laid on the ground on the side of the precast concrete sheet piles.

[0050] Step 4: Sink the precast steel trough with impermeable geotextile into the precast concrete sheet pile, and use the precast steel trough to set a graded crushed stone filter layer:

[0051] The precast steel trough is lifted, and the side of the steel trough with impermeable geotextile (which is the side with plain round steel bars in this embodiment) is pressed tightly against the sheet pile concrete. The precast steel trough is driven to the design elevation using a hydraulic hammer or static pressure equipment.

[0052] After the precast steel trough pile driving is completed, the part of the impermeable geotextile that is exposed above the ground is pressed firmly against the sheet pile with heavy objects.

[0053] Check for any soil leakage or siltation inside the precast steel trough. After cleaning the silt from the trough, fill the cavity of the precast steel trough with the graded crushed stone filter layer.

[0054] Step 5: Pull out the precast steel channel and install a cap beam on top of the precast concrete sheet pile to complete the preparation of the seepage prevention structure;

[0055] During the process of pulling out the precast steel trough, whenever the precast steel trough is lifted to a certain height, and the bottom of the precast steel trough must not exceed the top of the filled filter layer, continue to fill the precast steel trough with graded crushed stone filter layer. After each filter layer is filled, the pile body needs to be vibrated appropriately when lifting the precast steel trough, and external force is used to tamp it to make the filling material dense.

[0056] Repeat the above operation until the graded crushed stone is filled and the precast steel trough is completely pulled out;

[0057] At this point, the geotextile carrying the precast steel trough is completely attached to the sheet pile, the graded crushed stone is filled, and the filter layer behind the wall is prepared.

[0058] This scheme, while fulfilling the seepage prevention function of precast concrete sheet pile revetments, selects flexible permeable materials as the filter layer. The materials are conventional, and the construction is quick and convenient, which is more conducive to improving the seepage prevention effect of the revetment and reducing project investment. At the same time, the flexible permeable filter layer can better adapt to the deformation of the sheet pile revetment, solving the problem that rigid waterstops such as slots, jet grouting piles or grouting are prone to deformation and breakage, reducing the risk of soil leakage at the joints of the revetment. The flexible permeable filter layer is also more conducive to the exchange of water in front of and behind the sheet pile revetment wall, which helps to lower the water level behind the wall and reduce the water pressure load on the revetment.

[0059] The embodiments described above are merely one implementation method of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A precast concrete sheet pile revetment seepage prevention structure, characterized in that, This includes precast concrete sheet piles, graded crushed stone filter layer, impermeable geotextile, and cap beam; The precast concrete sheet pile revetment structure is set on the water-facing side of the waterway. The precast concrete sheet piles are set on the water-facing side of the waterway and driven vertically into the foundation. A graded crushed stone filter layer is set on the outer side of the precast concrete sheet pile at the joint position. The impermeable geotextile is installed on the backwater side of the precast concrete sheet pile and between the precast concrete sheet pile and the graded crushed stone filter layer. The cap beam is set on top of the precast concrete sheet pile.

2. The method for preparing the precast concrete sheet pile revetment seepage prevention structure according to claim 1, characterized in that, Includes the following steps: Step 1: Prepare the prefabricated steel channel; Step 2: Install impermeable geotextile in the precast steel trough; Step 3: Prepare precast concrete sheet piles and place them in the required locations; Step 4: Sink the precast steel trough with impermeable geotextile into the precast concrete sheet pile, and use the precast steel trough to set a graded crushed stone filter layer. Step 5: Pull out the precast steel channel and install a cap beam on top of the precast concrete sheet pile to complete the preparation of the seepage prevention structure.

3. The method for preparing the precast concrete sheet pile revetment seepage prevention structure according to claim 2, characterized in that, The prefabricated steel channel in step 1 includes a first steel plate, a second steel plate, a third steel plate, and a V-shaped steel slot; The first steel plate comprises two pieces, the two first steel plates are symmetrically arranged perpendicular to the ground, and a second steel plate is arranged horizontally between the two first steel plates and perpendicular to the ground; A third steel plate is placed on the second steel plate and between the two first steel plates; A V-shaped steel groove is welded to one side of the two first steel plates near the third steel plate; The first steel plate, the second steel plate, and the third steel plate are welded together to form a prefabricated steel channel.

4. The method for preparing the precast concrete sheet pile revetment seepage prevention structure according to claim 3, characterized in that, One end of each of the two first steel plates is cut at a preset slope to form an angle; The slot opening of the V-shaped steel slot faces an angled direction; The third steel plate is perpendicular to the two first steel plates and is connected to the second steel plate at a certain angle.

5. The method for preparing the precast concrete sheet pile revetment seepage prevention structure according to claim 3, characterized in that, The step 2 of installing impermeable geotextile in the precast steel trough specifically involves: A first plain round steel bar is provided at the end of the first steel plate on the non-oblique side, and a second plain round steel bar covered with impermeable geotextile is provided in the V-shaped steel groove of the first steel plate. The other end of the impermeable geotextile is fixedly connected to the second plain round steel bar.

6. The method for preparing the precast concrete sheet pile revetment seepage prevention structure according to claim 5, characterized in that, The impermeable geotextile is folded in half and then placed on the second plain round steel bar. After being straightened towards the first plain round steel bar, the edge of the impermeable geotextile is fixed to the first plain round steel bar.

7. The method for preparing a precast concrete sheet pile revetment seepage prevention structure according to claim 2, characterized in that, In step 3, the precast concrete sheet piles are driven into the preset position. After the piles are driven, the top of the precast concrete sheet piles is leveled, and a graded crushed stone filter layer of a certain thickness is laid on the ground on the side of the precast concrete sheet piles.

8. The method for preparing a precast concrete sheet pile revetment seepage prevention structure according to claim 2, characterized in that, Step 4, which involves sinking the precast steel trough equipped with impermeable geotextile into the precast concrete sheet pile, specifically involves: The precast steel trough is lifted up, and the side of the steel trough with impermeable geotextile is pressed tightly against the sheet pile concrete. The precast steel trough is then driven to the design elevation using a hydraulic hammer or static pressure equipment. After the precast steel trough pile driving is completed, the part of the impermeable geotextile that is exposed above the ground is pressed firmly against the sheet pile with heavy objects. Check for any soil leakage or siltation inside the precast steel trough. After cleaning the silt from the trough, fill the cavity of the precast steel trough with the graded crushed stone filter layer.

9. The method for preparing a precast concrete sheet pile revetment seepage prevention structure according to claim 2, characterized in that, In step 5, during the process of pulling out the precast steel trough, whenever the precast steel trough is lifted to a certain height, and the bottom of the precast steel trough must not exceed the top of the filled filter layer, the graded crushed stone filter layer is continued to be filled into the precast steel trough. After each filter layer is filled, the pile body needs to be vibrated appropriately when lifting the precast steel trough, and external force is used to tamp it to make the filling material dense. Repeat the above operation until the graded crushed stone is filled and the precast steel trough is completely pulled out; At this point, the geotextile carrying the precast steel trough is completely attached to the sheet pile, the graded crushed stone is filled, and the filter layer behind the wall is prepared.

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