Ecological reinforcing structure of river channel grouted rubble retaining wall revetment

Abstract

The invention provides an ecological reinforcing structure of a river channel grouted rubble retaining wall revetment, the ecological reinforcing structure takes double-row pile foundations and a planting platform as a core design concept, the first pile foundation is located at the foot of an existing grouted rubble retaining wall, the top of the pile foundation is provided with a reinforced concrete guide beam, and the second pile foundation is located at the foot of the existing grouted rubble retaining wall; the newly-built guide beam is connected with an existing grouted rubble retaining wall base into a whole through embedded steel bars, the integrity and the anti-sliding capacity of the retaining wall are remarkably enhanced, and base emptying and wall body deformation are effectively restrained. The second pile foundation structure is a planting pile and backfill soil behind the planting pile to construct an aquatic plant planting platform, geotechnical cloth is laid between the planting pile and the backfill soil, soil particle loss can be prevented, water is allowed to freely permeate, and normal exchange between water and soil is maintained. The stability of an existing retaining wall is guaranteed, an aquatic plant planting platform is constructed, the whole reinforcing system is hidden under the normal water level, the natural form of a river channel is maintained, and deep integration of ecology and safety is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic engineering, in particular to an ecological reinforcement structure of a river channel mortar block stone retaining wall revetment. BACKGROUND

[0002] In the field of hydraulic engineering, river regulation and embankment revetment, mortar block stone retaining wall as a traditional revetment structure type has been widely used in the past few decades due to its advantages of convenient material selection, relatively low cost, mature construction technology, etc. This type of retaining wall mainly relies on its own weight and the friction between the blocks to resist water and soil pressure, and plays a role in stabilizing the slope, preventing soil erosion, and protecting the embankment. However, with the increase of service life, changes in hydrogeological conditions (such as intensified river erosion, groundwater level fluctuation, foundation settlement, etc.), and the increase of operating load, a large number of existing mortar block stone retaining walls have appeared different degrees of damage, mainly manifested as: overall stability decline, foundation scouring, wall body tilting, local bulging and even collapse, threatening the safety of embankment and coastal facilities; structural integrity is damaged, mortar between blocks is aged, fallen off, weathered, leading to loose structure, increased leakage, and weakened retaining function; ecological function is missing, the surface of traditional mortar block stone retaining wall is hard, smooth and impermeable, forming a "hardened" barrier that blocks the ecological connection between water and land.

[0003] The direct consequence of the above-mentioned various diseases is: aquatic vegetation is difficult to grow, lacking a suitable substrate for plant germination and root development; aquatic animal habitat is lost, lacking shelter, foraging and breeding space; river ecological corridor is broken, seriously hindering the exchange of matter, energy and information between water and riparian zone, leading to serious degradation of riparian biodiversity and significant reduction of water self-purification capacity.

[0004] For the reinforcement needs of existing mortar block stone retaining walls, traditional technical means mainly include: reinforcing soil or backfilling pressure behind the wall to increase sliding resistance, but it occupies land on the shore and requires space behind. Throwing stones or adding anti-erosion tooth canals in front of the wall to prevent foundation scouring, but the ecological benefits are limited. Wall grouting or surface net spraying to repair cracks and enhance overall integrity, but further hardens the surface and exacerbates the ecological barrier problem. Complete demolition and reconstruction, with high cost, long construction period, large environmental impact, and new structures still using traditional forms, the ecological problem still exists.

[0005] In recent years, the concept of ecological revetment has been increasingly valued, and new structures such as natural gentle slope + vegetation protection slope, ecological block, gabion stone cage, and ecological bag have appeared. However, these technologies are mainly suitable for new construction projects or situations where the slope conditions allow for modification.

[0006] For a large number of built and need to retain, structure appears hidden danger of safety of the block stone retaining wall, how to realize effective structure reinforcement and significant ecological function recovery under the premise of not carrying out large-scale demolition and reconstruction, become the technical personnel urgently need to solve the technical problem. SUMMARY

[0007] In view of the above-mentioned disadvantages of the prior art, the purpose of the present application is to provide an ecological reinforcement structure for reinforcing an existing block stone retaining wall.

[0008] To achieve the above object and other related objects, the present application provides an ecological reinforcement structure of a block stone retaining wall revetment of a river channel, which comprises:

[0009] The block stone retaining wall has a water-facing surface facing the river surface, and the base of the block stone retaining wall protrudes in the transverse direction to form a protruding portion on the water-facing surface;

[0010] The first pile foundation is arranged along the river channel and is vertically driven into the riverbed slope, and the first pile foundation is located on the side of the block stone retaining wall facing the river surface and has a top higher than the base of the block stone retaining wall. The top of the first pile foundation is provided with a reinforced concrete guide beam arranged along the river channel. The reinforced concrete guide beam extends in the river width direction to above the protruding portion and is connected to the protruding portion by means of anchoring.

[0011] The second pile foundation is arranged along the river channel and is vertically driven into the riverbed slope, and the second pile foundation is located on the side of the first pile foundation away from the block stone retaining wall.

[0012] Optionally, the first pile foundation is a steel sheet pile, and the second pile foundation is a wood-like pile.

[0013] Optionally, the gap between the first pile foundation and the block stone retaining wall is filled with fine stone concrete.

[0014] Optionally, in the river width direction, the distance between the first pile foundation and the second pile foundation is 2-3m.

[0015] Optionally, the first pile foundation and the second pile foundation both protrude upward from the riverbed slope, and the first pile foundation, the second pile foundation and the riverbed slope form a surrounding groove, and the surrounding groove is backfilled with planting soil for planting aquatic plants.

[0016] Optionally, the side wall surface of the second pile foundation close to the first pile foundation is paved with geotextile, and the lower end of the geotextile further extends transversely to the riverbed slope.

[0017] Optionally, the top surface of the reinforced concrete guide beam and the top surface of the second pile foundation are located on the same horizontal plane, and are lower than the normal water level and higher than the low water level.

[0018] Optionally, the bottom depth of the first pile foundation is greater than the bottom depth of the second pile foundation.

[0019] Optionally, a bank slope is formed on the side of the dry masonry retaining wall facing away from the river surface, and the bank slope is inclined upward from the top surface of the dry masonry retaining wall and is planted with greenery.

[0020] Optionally, the dry masonry retaining wall is higher than the normal water level and lower than the high water level, and the bank slope is higher than the high water level.

[0021] As described above, the present application provides an ecological reinforcement structure for a river dry masonry retaining wall revetment, which has the following beneficial effects:

[0022] 1) The damage to the existing structure and the impact on the surrounding environment are minimized.

[0023] 2) The reinforcement structure is located underwater, and after reinforcement, the existing shoreline is not changed, and is coordinated with the surrounding environment.

[0024] 3) The new and old structures are cooperatively stressed through pile foundation + guide beam anchorage connection, large-scale excavation is avoided, the stress is reliable, and the integrity is good.

[0025] 4) The second pile foundation is used to build a stable planting platform, which not only ensures the stability of the bank slope (reduces soil and water loss) but also plants aquatic vegetation, thereby improving the ecology of the river. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A cross-sectional view of the ecological reinforcement structure in the present application is shown.

[0027] ELEMENT NUMBER EXPLANATION

[0028] First pile foundation 1; reinforced concrete guide beam 2; anchorage 3; fine stone concrete 4; second pile foundation 5; planting soil 6; geotextile 7; aquatic plant 8. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be described in detail by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. The present application can also be implemented or applied by different specific embodiments, and various modifications or changes can be made based on different views and applications without departing from the spirit of the present application.

[0030] As in the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application here. In addition, three-dimensional spatial dimensions of length, width and depth should be included in actual production.

[0031] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for the device in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it can be the only layer between the two layers, or there may be one or more layers in between. The phrase “between” as used herein includes both endpoint values.

[0032] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are formed in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0033] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0034] like Figure 1 As shown, the present invention provides an ecological reinforcement structure for riverbank masonry retaining walls, the ecological reinforcement structure comprising:

[0035] The masonry retaining wall has a water-facing side facing the river, and the base of the masonry retaining wall protrudes laterally from the water-facing side to form a protrusion.

[0036] The first pile foundation 1 is arranged along the river channel and driven vertically into the riverbed slope. The first pile foundation 1 is located on the side of the masonry retaining wall facing the river and its top is higher than the base of the masonry retaining wall. The top of the first pile foundation 1 is provided with a reinforced concrete guide beam 2 arranged along the river channel. The reinforced concrete guide beam 2 extends along the width of the river to the top of the protrusion and is connected to the protrusion by rebar 3.

[0037] The second pile foundation 5 is arranged along the river channel and driven vertically into the riverbed slope. The second pile foundation 5 is located on the side of the first pile foundation 1 away from the masonry retaining wall.

[0038] The first pile foundation 1 is plate-shaped, preferably a steel sheet pile; the second pile foundation 5 is preferably a wood-imitating pile.

[0039] Sheet pile is a kind of prefabricated plate-shaped component specially used for driving or pressing into the soil, which usually has a locking port and can be connected to each other to form a continuous and impermeable retaining wall structure, such as steel sheet pile, concrete sheet pile, etc. Steel sheet pile is the most commonly used sheet pile, which has the advantages of high strength, light weight, easy construction and transportation, etc. Concrete sheet pile has the advantages of good durability, strong corrosion resistance, etc., but it is heavy and requires larger equipment for construction. In view of the reinforcing construction environment based on the existing mortar block retaining wall in the present application, obviously steel sheet pile is more suitable for the construction environment in the present application.

[0040] For the second pile foundation, the imitated wooden pile usually adopted is a cement imitated wooden pile, which is made of reinforced concrete material, poured through a mold carved with wood texture, and the surface is sprayed with professional imitated wood paint. It has the advantages of high strength, extremely durable, corrosion resistant, termite resistant, good fire resistance, etc., and can also create a natural and simple atmosphere, which is not only beautiful but also durable, and is the mainstream choice in water conservancy projects and ecological slope protection.

[0041] Further, the gap between the first pile foundation 1 and the mortar block retaining wall is filled with fine stone concrete 4. Before the filling operation, the contact surface needs to be thoroughly cleaned and wetted to ensure the quality of the combination of new and old materials; during the pouring process, it is necessary to vibrate and compact layer by layer to ensure the integrity and density of the filling body. This method not only enhances the load transfer performance between the pile foundation and the retaining wall, but also effectively improves the stability and impermeability of the overall structure.

[0042] Further, along the river width direction, the distance between the first pile foundation 1 and the second pile foundation 5 is 2-3m. This distance is designed taking into account the water flow scouring effect, pile foundation bearing capacity requirement and overall structural stability, which can effectively disperse the load transmitted by the upper structure while ensuring the cooperative stress of the pile foundation. In addition, this distance range is also conducive to construction operation, taking into account the economic and safety requirements.

[0043] Further, the first pile foundation 1 and the second pile foundation 5 both protrude upward from the riverbed slope, and the first pile foundation 1, the second pile foundation 5 and the riverbed slope form a cofferdam, and the cofferdam is backfilled with planting soil 6 for planting aquatic plants 8. The side wall surface of the second pile foundation close to the first pile foundation is paved with geotextile 7, and the lower end of the geotextile 7 also extends transversely to the riverbed slope.

[0044] Specifically, by constructing two main structures of the first pile foundation and the second pile foundation, and connecting with the original riverbed slope, a stable ecological cofferdam is formed. After the cofferdam is treated for impermeability, it is backfilled with special planting soil, and the soil ratio and fertility are optimized according to the growth characteristics of aquatic plants. This structure aims to provide a stable root matrix and sufficient nutrient supply for various aquatic plants (such as reed, cattail, iris, etc.), so as to build a sustainable ecological buffer zone with water purification function.

[0045] Further, the top surface of the reinforced concrete girder 2 is at the same level as the top surface of the second pile foundation 5, and is lower than the normal water level and higher than the low water level. The height difference is designed to allow water to naturally flow over the top surface of the pile foundation, forming a slow and continuous overflow effect, thereby providing stable water supply and suitable growth environment for the surrounding aquatic plants. This design takes into account both the coordination of the overall structure and the water flow requirements, and also embodies the design concept of combining structural function and ecological restoration in ecological water conservancy engineering.

[0046] Further, the bottom of the first pile foundation 1 is embedded deeper than the bottom of the second pile foundation 5. As the core reinforcing structure, the first pile foundation 1 needs to be embedded in a deeper stable stratum to ensure the bearing capacity and long-term safety of the overall structure.

[0047] Further, the side of the mortar block stone retaining wall facing away from the river surface forms a bank slope, which is inclined upward from the top surface of the mortar block stone retaining wall and has green vegetation planted on the slope surface. The bank slope closely connects with the retaining wall structure, enhancing the overall stability and forming a natural transition in topography. The green vegetation on the slope surface further stabilizes the soil on the slope surface, effectively reducing the risk of soil erosion, while increasing the aesthetic appeal. The mortar block stone retaining wall is higher than the normal water level and lower than the high water level, and the bank slope is higher than the high water level.

[0048] The construction scheme of the entire ecological reinforcement structure is as follows:

[0049] The first pile foundation is set at the foot of the existing mortar block stone retaining wall. The first pile foundation is made of steel sheet piles, and the top of the steel sheet piles is provided with a reinforced concrete girder 2. The reinforced concrete girder 2 is connected to the base of the existing revetment through the dowel 3 to form an integral structure, forming an overall force system. Fine stone concrete 4 is poured between the first pile foundation and the existing mortar block stone retaining wall. The second pile foundation 5, which is a wooden pile, is located 2-3 meters outside the first pile foundation. This row of pile foundations not only plays a supporting role in preventing erosion, but also has an ecological landscape effect. The backfill planting soil behind the wooden pile provides a growth medium for aquatic plants. A layer of geotextile 7 is laid between the planting soil and the wooden pile, which plays a role in reverse filtration and erosion prevention, preventing soil loss while maintaining unobstructed drainage. Finally, the backfilled planting soil is reasonably planted with aquatic plants with water purification and landscape functions, further enhancing the ecological and aesthetic properties of the shoreline.

[0050] In summary, the present application provides a kind of ecological reinforcement structure of river channel mortar block stone retaining wall revetment, which takes "double-row pile foundation + planting platform" as the core design concept, the first pile foundation is located at the wall foot of existing mortar block stone retaining wall, the top of pile foundation is provided with reinforced concrete guide beam, the newly-built guide beam is connected with the base of existing mortar block stone retaining wall by planting nails to become a whole, which significantly enhances the integrity and anti-sliding capacity of the retaining wall, effectively inhibits the base hollowing and wall deformation. The second pile foundation structure is a planting pile, which is 2-3 m away from the first pile foundation, the backfill soil behind the pile constructs an aquatic plant planting platform, geotextile is laid between the planting pile and the backfill soil, which can prevent soil loss and allow water to penetrate freely, maintaining the normal exchange between water and soil. The present application not only ensures the stability of the existing retaining wall, but also constructs an aquatic plant planting platform, the entire reinforcement system is hidden under the normal water level, maintains the natural form of river channel, and achieves the deep integration of ecology and safety.

[0051] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. An ecological reinforcement structure of a river channel revetment block stone retaining wall, characterized by, The ecological reinforcement structure comprises: The mortar block stone retaining wall has a water-facing surface facing the river surface, and a base of the mortar block stone retaining wall protrudes transversely to form a protruding portion; The first pile foundation is arranged along the river course and vertically punched into the riverbed slope, and the first pile foundation is located on one side of the mortar block stone retaining wall facing the river surface and has a top higher than the base of the mortar block stone retaining wall, and the top of the first pile foundation is provided with a reinforced concrete guide beam arranged along the river course, which extends to the upper side of the protruding portion in the river width direction and is connected with the protruding portion through a planted rod; The second pile foundation is arranged along the river course and vertically punched into the riverbed slope, and the second pile foundation is located on one side of the first pile foundation away from the mortar block stone retaining wall.

2. The ecological reinforcement structure of the river channel block stone retaining wall revetment according to claim 1, characterized in that: The first pile foundation is a steel sheet pile, and the second pile foundation is a wood-like pile.

3. The ecological reinforcement structure of the river channel block stone retaining wall revetment according to claim 1, characterized in that: The gap between the first pile foundation and the mortar block stone retaining wall is filled with fine stone concrete.

4. The ecological reinforcement structure of the river channel block stone retaining wall revetment according to claim 1, characterized in that: In the river width direction, the distance between the first pile foundation and the second pile foundation is 2-3 m.

5. The ecological reinforcement structure of the river channel block stone retaining wall revetment according to claim 1, characterized in that: The first pile foundation and the second pile foundation both protrude upward from the riverbed slope, and the first pile foundation, the second pile foundation and the riverbed slope form a surrounding groove, and the surrounding groove is backfilled with planting soil for planting aquatic plants.

6. The ecological reinforcement structure of the river channel block stone retaining wall revetment according to claim 5, characterized in that: The side wall surface of the second pile foundation close to the first pile foundation is paved with geotextile, and the lower end of the geotextile also extends transversely to the riverbed slope.

7. The ecological reinforcement structure of a river channel revetment block stone retaining wall according to claim 1, characterized in that: The top surface of the reinforced concrete guide beam and the top surface of the second pile foundation are located on the same horizontal plane and are lower than the normal water level and higher than the low water level.

8. The ecological reinforcement structure of a river channel revetment block stone retaining wall according to claim 1, characterized in that: The bottom of the first pile foundation is deeper than the bottom of the second pile foundation.

9. The ecological reinforcement structure of a river channel gabion retaining wall revetment according to claim 1, characterized in that: The side of the mortar block stone retaining wall away from the river surface forms a bank slope, the bank slope is inclined upward from the top surface of the mortar block stone retaining wall, and the slope surface is planted with green vegetation.

10. The ecological reinforcement structure of a river channel gabion retaining wall revetment according to claim 9, characterized in that: The mortar block stone retaining wall is higher than the normal water level and lower than the high water level, and the bank slope is higher than the high water level.

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