Prefabricated assembly type reinforced retaining wall structure

Abstract

The utility model relates to the technical field of building engineering support structure construction, concretely relates to a prefabricated assembly type reinforced retaining wall structure, including reinforced concrete base layer, be provided with prefabricated concrete panel on the reinforced concrete base layer, the prefabricated concrete panel is mortise and tenon structure, and the prefabricated concrete panel is connected between cooperation, the connecting place of prefabricated concrete panel is provided with multilayer steel plastic geogrid, the top of prefabricated concrete panel is provided with waterproof layer, and the waterproof layer is provided with filter bed, and the filter bed is communicated with the drain hole set up on the prefabricated concrete panel and is provided. The utility model aims at solving the problem that the existing retaining wall is unstable due to the insufficient connection stability of prefabricated panel, the poor stress dispersion of reinforced structure and the imperfect drainage system, and the structure is easy to lose stability.

Description

Technical Field

[0001] This utility model belongs to the field of construction technology of building support structure, and relates to a prefabricated reinforced retaining wall structure. Background Technology

[0002] In the field of building support structure construction, precast reinforced retaining wall structures are widely used in various projects due to their advantages such as convenient construction and controllable cost. These structures typically consist of precast panels, a foundation layer, reinforcement materials, and a drainage system. They achieve their retaining function through the synergistic effect of these components, and their performance directly affects the safety and stability of the project. However, existing precast reinforced retaining walls have several problems in production and actual use. Regarding the connection of precast panels, insufficient connection stability makes the panels prone to loosening and misalignment under lateral earth pressure, affecting the overall rigidity of the structure. The reinforcement structure has poor stress dispersion, the connection strength between the reinforcement material and the panel is insufficient, and the fixed number and spacing of layers make it difficult to adjust flexibly according to actual earth pressure, resulting in poor reinforcement effect. The drainage system is also inadequate, failing to effectively address rainwater infiltration, which in turn alters the mechanical properties of the backfill soil, softens the foundation layer, and makes the structure prone to instability. After reviewing relevant materials, some solutions to these problems have been found. For example, patent CN115853013A, titled "Prefabricated Retaining Wall Structure," employs a protrusion-groove locking structure for prefabricated panel connections. Cylindrical or frustum-shaped protrusions interlock with matching grooves, restricting the horizontal relative movement of the panels. The advantages of this structure are its simple construction, the ability to adjust the retaining wall height by stacking panels, and its high construction flexibility. However, it is a point-contact connection, requiring high prefabrication precision. Under long-term stress, localized stress concentration can easily lead to damage at the connection points, and its stability needs improvement. Regarding reinforcement, this scheme embeds fiber-reinforced composite material grids within the backfill soil. One side of the horizontally arranged grid is connected to the retaining wall unit. A layer of grid is connected to each joint between the foundation block and the panel, as well as at each joint between the stacked panel ends, with a spacing of 50cm between adjacent grid layers. Its advantages include lightweight and corrosion-resistant grid material, and a certain degree of reinforcement effect from layered arrangement. However, the grid and panel are only connected by connecting rings to the protrusions, resulting in limited strength. Furthermore, the fixed number of layers and spacing cannot be flexibly adjusted according to soil pressure distribution, leading to poor stress dispersion. Regarding the drainage system, this patent utilizes the structural joints between retaining wall units as drainage channels, which also serve as settlement joints, filled with asphalt-impregnated hemp rope or asphalt-impregnated wood boards. The advantage is a simplified structure, combining drainage and settlement mitigation functions. However, the drainage path is singular, prone to blockage or failure due to aging of the filling material, and lacks specialized filtration and waterproofing measures, failing to prevent rainwater seepage into the panel-foundation junction. Additionally, traditional high-backfill slope protection using anti-slide piles + inter-pile retaining plates or anchor rods, anchor cables + grid structures + soil improvement reinforcement methods suffers from high project costs, long construction periods, and uncontrollable project costs and construction progress. In summary, existing solutions have certain limitations.This utility model adopts a mortise and tenon structure for precast concrete panels to improve the stability of the panel connection; multiple layers of steel-plastic geogrids are set at the connection of the precast concrete panels to optimize the stress performance of the reinforced structure; by setting a waterproof layer on the top of the precast concrete panel and a filter layer connected to the drainage holes of the panel on the waterproof layer, the drainage system is improved, thereby solving the problem of easy instability of existing retaining wall structures. Utility Model Content

[0003] This utility model provides a prefabricated reinforced retaining wall structure, which solves the problem of structural instability caused by insufficient stability of prefabricated panel connections, poor stress distribution of reinforced structures, and imperfect drainage systems in existing retaining walls.

[0004] To solve the above problems, the technical solution adopted by the utility model is as follows:

[0005] A precast reinforced retaining wall structure includes a reinforced concrete foundation layer, on which precast concrete panels are provided. The precast concrete panels have a mortise and tenon structure and are connected to each other. Multiple layers of steel-plastic geogrid are provided at the joints of the precast concrete panels. A waterproof layer is provided on the top of the precast concrete panels, and a filter layer is provided on the waterproof layer. The filter layer is connected to the drainage holes provided on the precast concrete panels.

[0006] The principle and advantages of this scheme are as follows:

[0007] The precast concrete panels are connected using a mortise and tenon structure. The interlocking properties of the mortise and tenon create a mechanical lock, enhancing the overall integrity of the panel connection and effectively resisting the lateral thrust of the backfill soil. The multi-layer steel-plastic geogrid installed at the panel joints is in close contact with the backfill soil. The internal friction between the geogrid and the soil disperses the lateral force transmitted by the panel to the entire backfill area. The top waterproof layer prevents surface rainwater from seeping in, and the filter layer filters the seeping rainwater and discharges it in a timely manner through connected drainage holes, preventing rainwater retention from altering the soil's mechanical parameters. These multiple structural elements work together to ensure the structural stability of the retaining wall during long-term use.

[0008] Compared to existing technologies, precast panels often use simple splicing or bolt connections, which are prone to loosening or even breakage due to concentrated stress. The mortise and tenon structure in this solution significantly improves connection strength through physical interlocking. For example, under the same lateral pressure, the relative displacement of adjacent panels is reduced, solving the problem of insufficient connection stability. Existing reinforced structures often suffer from uneven stress transmission due to dispersed grid arrangement or insufficient layers. This solution concentrates multiple layers of steel-plastic geogrid at the panel connections, improving tensile force transmission efficiency and effectively solving the problem of dispersed stress in reinforced structures. Existing drainage systems are mostly single-hole designs, prone to clogging by debris. This solution's interconnected system of waterproof layer – filter layer – drainage hole not only blocks surface seepage but also filters rainwater and discharges it quickly, improving drainage efficiency and preventing soil softening even under continuous rainfall. Furthermore, the synergistic effect of these structures brings unexpected additional advantages, such as reducing on-site construction time due to factory-prefabricated mortise and tenon panels.

[0009] Furthermore, the precast concrete panel has a connecting groove at the upper end and a connector at the lower end, with the connecting groove and connector forming a trapezoidal structure. The groove of the precast concrete panel mates with another precast concrete panel connector. The trapezoidal structure provides guidance, enabling quick alignment and positioning during installation, improving assembly efficiency. Pre-fixation can be achieved through the mutual contact of the trapezoidal inclined surfaces during assembly, reducing the need for temporary supports. On the other hand, the trapezoidal structure has a larger side contact area, which, combined with the characteristics of mortise and tenon joints, effectively disperses vertical pressure and lateral shear force between panels, preventing cracking at the connection point due to stress concentration, and enhancing the integrity and connection strength of adjacent panels. Simultaneously, when subjected to lateral thrust from backfill soil, the trapezoidal mating structure exhibits a self-locking tendency, narrower at the top and wider at the bottom, further enhancing the overall overturning resistance of the retaining wall.

[0010] Furthermore, the connection between the steel-plastic geogrid and the precast concrete panel is bent, with one end extending to the bottom of the connecting groove of the precast concrete panel. The shape of the bend is consistent with the shape of the bottom of the connecting groove, and the bend fits the bottom shape of the connecting groove, which increases the contact area between the geogrid and the panel. With cement mortar fixing, a stronger connection can be formed, preventing the geogrid from slipping relative to the panel under stress and ensuring that the geogrid can effectively transmit tensile force. On the other hand, the bending structure increases the depth of the geogrid into the panel connection part, forming a cooperative force-bearing system with the trapezoidal connecting groove and connectors. When the retaining wall is subjected to lateral earth pressure, the bending part can distribute the tensile force to the connection node of the panel, reducing the local stress concentration of the geogrid, further improving the deformation resistance and overall stability of the retaining wall, and solving the problem of insufficient connection strength caused by the geogrid being simply fixed by connecting rings in the prior art.

[0011] Furthermore, the bottom of the connecting groove is filled with cement mortar. The cement mortar can fully fill the gaps between the bottom of the connecting groove and the precast concrete panel connectors and the bent parts of the steel-plastic geogrid, so that the components are tightly integrated into a whole, avoiding stress concentration caused by gaps, and enhancing the integrity and load-bearing capacity of the connection. After hardening, the cement mortar has high strength and adhesion, which can firmly fix the bent parts of the steel-plastic geogrid in the connecting groove, ensuring that the geogrid can effectively transmit tensile force when under stress. At the same time, it strengthens the tenon and mortise connection strength between the precast concrete panels, preventing the panels from loosening or shifting under lateral earth pressure. In addition, the cement mortar can also play a sealing role, reducing rainwater seepage into the retaining wall through the connection gaps. Together with the waterproof layer, filter layer and drainage holes, it forms a complete waterproof system, further ensuring the long-term stability of the structure.

[0012] Furthermore, the parallel arrangement of the steel-plastic geogrids ensures that the geogrids are evenly distributed in the direction perpendicular to the wall, with consistent contact area with the backfill soil. This allows for the uniform transfer of lateral earth pressure to the entire geogrid system, avoiding localized stress concentration caused by chaotic arrangement angles and enhancing the restraint effect on the backfill soil. The parallel arrangement also conforms to the connection requirements parallel to the wall in the geogrid overlap specifications, facilitating the use of connecting straps for overlap and fixation, ensuring the strength and integrity of the overlapped parts. Simultaneously, it cooperates with the mortise and tenon connection structure of the precast concrete panel, enabling the geogrid, panel, and backfill soil to form a cohesive whole that effectively resists soil deformation. The parallel arrangement further enhances the superposition effect of multiple geogrids, improving the overall stability of the retaining wall structure.

[0013] Furthermore, each precast concrete panel corresponds to a steel-plastic geogrid. The connection between the precast concrete panels is achieved by a steel-plastic geogrid perpendicularly to the precast concrete panel. This perpendicular arrangement allows the geogrid to fully utilize its tensile strength along the critical stress direction of the retaining wall, i.e., the direction of lateral force perpendicular to the wall surface. This directly transmits the lateral earth pressure borne by the panel to the backfill soil. The friction between the geogrid and the soil efficiently disperses the load, avoiding localized stress concentration caused by deviation of the force transmission path. The one-to-one correspondence ensures that the force on each panel can be transmitted through a dedicated geogrid. Combined with the tenon and mortise connections between the panels, this enhances the overall deformation resistance of the structure.

[0014] Furthermore, the connector is inserted at half the depth of the connecting groove, ensuring sufficient contact area between the connector and the groove. This allows for the transmission of vertical pressure and lateral shear force through the side contact of the trapezoidal structure, preventing loosening due to insufficient force at the connection point caused by shallow insertion. The remaining half of the groove depth can accommodate the bent portion of the steel-plastic geogrid and the filling cement mortar, ensuring that the geogrid, connector, and connecting groove are tightly bonded as a whole through cement mortar. This ensures that the geogrid can effectively transmit tensile force while avoiding insufficient space in the groove due to excessive insertion, which would affect the filling effect. At the same time, this depth setting is compatible with the self-locking tendency of the mortise and tenon structure, forming a stable force balance when subjected to lateral thrust. It works synergistically with the overall force system of the retaining wall, improving the reliability and stability of the structural connection.

[0015] Furthermore, a filter layer is provided on the inner side of the precast concrete panel. This filter layer is fitted to the precast concrete panel, which allows the filter layer to directly receive rainwater seeping into the inner side of the panel, quickly filtering out fine soil particles and preventing particles from clogging the subsequent drainage channels. This ensures that the seeping water can smoothly enter the bottom gravel drainage layer. The close fit between the filter layer and the panel reduces the gap between them, preventing rainwater from stagnating in the gap and causing water pressure erosion on the back of the panel.

[0016] Furthermore, the drainage holes are multiple and are horizontally spaced at every fifth precast concrete panel. Vertically, they are arranged in alternating rows of two and three. The horizontal spacing ensures drainage coverage while avoiding weakening the overall structure of the panels due to excessively dense hole spacing. The spacing between every five panels matches the distribution of stress nodes in the panel tenon and mortise connections, ensuring that drainage points are evenly aligned with the horizontal stress units of the retaining wall. The alternating rows of two and three vertically create a three-dimensional, staggered drainage path, ensuring that seepage from different heights can be efficiently collected and discharged. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the connection structure of the precast concrete panel of this utility model.

[0020] Figure 4 for Figure 3 A magnified view of a portion of the image. Detailed Implementation

[0021] The reference numerals in the accompanying drawings include: 1. Precast concrete panel; 2. Steel-plastic geogrid; 3. Cement-soil cushion layer; 4. Reinforced concrete foundation layer; 5. Cement mortar; 6. Concrete sealing layer; 7. Reinforced concrete capstone; 8. Waterproof geomembrane; 9. Filter layer; 10. Drainage layer; 11. Drainage hole; 12. Settlement joint; 13. Backfill soil; 14. Connecting groove; 15. Connector.

[0022] Example 1 is basically as follows Figure 1-4 As shown, a precast reinforced retaining wall structure includes a reinforced concrete foundation layer 4, which is poured on a compacted foundation. A 300mm thick cement-soil cushion layer 3 is laid at the bottom to enhance the bearing capacity of the foundation. A precast concrete panel 1 is provided on the top surface of the reinforced concrete foundation layer 4 along its length. The precast concrete panel 1 is precast in a C30 concrete factory.

[0023] The precast concrete panels 1 are connected using a mortise and tenon structure: a trapezoidal connecting groove 14 is opened at the upper end of each panel, and a trapezoidal connector 15 is cast at the lower end. The slope of the connecting groove 14 and the connector 15 is 1:0.2, wider at the top and narrower at the bottom. The connector 15 of adjacent panels is inserted into the connecting groove 14 of another panel to form a fit, with the insertion depth being half the total depth of the connecting groove 14. The bottom of the connecting groove 14 is filled with cement mortar 5, which is of M10 strength grade. After filling, it adheres tightly to the connector and the wall of the connecting groove, and after hardening, it fixes the adjacent panels into a whole.

[0024] At the joints of the precast concrete panels 1, multiple layers of steel-plastic geogrid 2 are installed, with a spacing of 150mm between each layer. The tensile strength of the steel-plastic geogrid 2 is... The steel-plastic geogrid 2 is perpendicular to the precast concrete panel 1 and corresponds one-to-one with each panel. One end of the steel-plastic geogrid 2 near the panel is bent, with the bend shape matching the bottom shape of the connecting groove 14. The bent portion extends to the bottom of the connecting groove 14 and is embedded in the cement mortar 5, where it is fixed. The other end of the steel-plastic geogrid 2 extends horizontally into the backfill soil 13. Adjacent steel-plastic geogrids 2 are arranged parallel to each other and overlapped by connecting strips, with an overlap length of... .

[0025] A filter layer 9 is attached to the inner side of the precast concrete panel 1, using... Geotextile and filter layer 9 cover the inner side of the panel and the joints to filter infiltrated rainwater. Drainage holes 11 are provided along the height of the bottom of the panel. Multiple drainage holes 11 are arranged horizontally at intervals of every five precast concrete panels 1, and vertically in alternating rows of two and three. The horizontal spacing ensures drainage coverage while avoiding weakening the overall structure of the panel due to excessively dense hole spacing. The interval between every five panels matches the distribution of stress nodes in the panel's tenon and mortise joints, ensuring that drainage points evenly correspond to the horizontal stress units of the retaining wall. The alternating rows of two and three vertically create a three-dimensional, staggered drainage path, ensuring that seepage from different heights is efficiently collected and discharged.

[0026] A waterproof geomembrane 8 is laid between the top surface of the reinforced concrete foundation layer 4 and the precast concrete panel 1, using a two-layer geotextile and one-layer membrane composite structure to prevent water accumulation in the foundation layer from seeping into the panel joints. A reinforced concrete capstone 7 is poured at the top of the retaining wall. The capstone is connected to the uppermost precast concrete panel 1 by embedded steel bars, and a waterproof geomembrane 8 is installed on the top surface of the capstone. Drainage slope. Settlement joint 12 is set every 10m along the length of the retaining wall. Settlement joint 12 is filled with asphalt wood fiberboard, with a joint width of 20mm, and runs through the entire height of the retaining wall, including the foundation layer and the panel.

[0027] The working process and force principle of this embodiment are as follows:

[0028] Structural Assembly: During construction, first pour the reinforced concrete foundation layer 4 and the cement-soil cushion layer 3. After the foundation strength reaches the standard, start hoisting the precast concrete panels 1 from the starting point of the retaining wall. Assemble them piece by piece using trapezoidal connecting grooves and connectors. At the same time, lay the bent portion of the steel-plastic geogrid 2 in the connecting groove and fill it with cement mortar 5. After installing every 3 panels, backfill and compact the soil inside the panels, and the compaction degree is... Simultaneously, the horizontal extension of the steel-plastic geogrid 2 is laid to ensure close contact between the geogrid and the soil.

[0029] The lateral earth pressure generated by the backfill soil 13 acts on the precast concrete panel 1, and the panel transmits the force to the adjacent panel through the tenon and mortise structure. At the same time, the lateral force is transmitted through the panel to the steel-plastic geogrid 2. The geogrid generates tensile force due to friction with the soil, dispersing the earth pressure into the backfill soil 13. The synergistic effect of the panel, geogrid, and soil resists deformation. The self-locking characteristics of the trapezoidal connecting groove and the connector, as well as the fixing effect of the cement mortar 5, ensure that the panel does not slip relative to each other when under stress.

[0030] After rainwater seeps into the backfill soil 13, it is filtered by the filter layer 9 (blocking fine particles) and discharged to the outside of the retaining wall through the drainage holes 11. The waterproof geomembrane 8 prevents water from accumulating in the foundation layer from seeping upwards, and the asphalt-impregnated wood fiberboard in the settlement joint 12 allows for slight settlement of the retaining wall while preventing rainwater from seeping in along the joint. These multiple drainage measures avoid increased lateral pressure caused by soil softening.

[0031] When the retaining wall deforms due to uneven settlement of the foundation, the settlement joint 12 can absorb part of the deformation and prevent the panel from cracking; the flexible characteristics of the steel-plastic geogrid 2 can adapt to the small displacement of the soil and ensure that the tensile force is continuously and effectively transmitted.

[0032] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A precast segmental reinforced retaining wall structure, characterized by: The system includes a reinforced concrete foundation layer, on which precast concrete panels are provided. The precast concrete panels have a mortise and tenon structure and are connected to each other. Multiple layers of steel-plastic geogrids are provided at the joints of the precast concrete panels. A waterproof layer is provided on top of the precast concrete panels, and a filter layer is provided on the waterproof layer. The filter layer on the waterproof layer is connected to the drainage holes provided on the precast concrete panels.

2. The prefabricated reinforced retaining wall structure according to claim 1, wherein, The precast concrete panel has a connecting groove at the upper end and a connector at the lower end. The connecting groove and the connector are arranged in a trapezoidal structure. The groove of the precast concrete panel is connected to the connector of another precast concrete panel.

3. The prefabricated reinforced retaining wall structure according to claim 1, characterized in that, The connection between the steel-plastic geogrid and the precast concrete panel is bent, with one end of the bend extending to the bottom of the connection groove of the precast concrete panel, and the shape of the bend is consistent with the bottom shape of the trapezoidal connection groove.

4. A prefabricated reinforced retaining wall structure according to claim 2, characterized in that, The bottom of the connecting groove is filled with cement mortar.

5. A prefabricated reinforced retaining wall structure according to claim 1, characterized in that, The steel-plastic geogrids are arranged in parallel.

6. A prefabricated reinforced retaining wall structure according to claim 1, characterized in that, The precast concrete panels and steel-plastic geogrids are one-to-one, and steel-plastic geogrids are installed at the joints of the precast concrete panels, which are perpendicular to the precast concrete panels.

7. A prefabricated reinforced retaining wall structure according to claim 1, characterized in that, The connector is inserted at half the depth of the connecting groove.

8. A prefabricated reinforced retaining wall structure according to claim 1, characterized in that, A water filter layer is provided on the inner side of the precast concrete panel, and the water filter layer is attached to the precast concrete panel.

9. A prefabricated reinforced retaining wall structure according to claim 1, characterized in that, The drainage holes are multiple and are arranged horizontally at intervals at every fifth precast concrete panel, and vertically arranged in alternating rows of two and three.

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