Counterfort retaining wall

Abstract

The present invention provides a counterfort retaining wall, which includes multiple layers of first sub-retaining walls arranged along the height direction of the counterfort retaining wall, and adjacent two layers of first sub-retaining walls are connected to each other; the first sub-retaining wall includes a first bottom plate, a first wall panel and multiple columns, the first wall panel and each column are both arranged on the top side of the first bottom plate, each column is arranged at an interval with the first wall panel and is located on the side of the first wall panel facing the soil body, along the height direction of the counterfort retaining wall, the first bottom plate of the upper-layer first sub-retaining wall supports and connects to the top ends of the first wall panel and each column of the lower-layer first sub-retaining wall. This counterfort retaining wall is a prefabricated and assembled retaining wall, which can be prefabricated in a factory and then assembled on site, increasing the retaining height of the retaining wall, improving the construction efficiency, and being less affected by weather factors; multiple columns are added to the bottom plate to form an integral structure of the first sub-retaining wall, improving its overall mechanical properties, and enhancing the anti-slip ability and self-stability of the counterfort retaining wall.

Description

Technical Field

[0001] The present invention relates to the technical field of subgrade reinforcement, and particularly relates to a counterfort retaining wall. Background Art

[0002] A counterfort retaining wall is a reinforced concrete thin-wall retaining wall, generally used in higher fill sections to stabilize the embankment, reduce the earthwork volume and floor area. The cross-sectional dimension of the counterfort retaining wall is small, and the soil weight on the heel slab can effectively resist overturning and sliding. The vertical slab and the counterforts jointly bear the bending moment and shear force generated by the earth pressure, and the stress is better than that of the cantilever retaining wall. However, the counterfort retaining wall has the following problems: the retaining height that the retaining wall can achieve is relatively low, and when the wall height is relatively large, the steel consumption increases sharply, affecting its economic performance; the retaining wall needs to be cast in place on site, and the construction quality is greatly affected by factors such as construction technology, weather and raw materials; and the construction period of the retaining wall is relatively long. Summary of the Invention

[0003] The present invention provides a counterfort retaining wall to solve the technical problems in the prior art that the retaining height of the counterfort retaining wall is low and the quality is more affected by external factors.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] The present invention provides a counterfort retaining wall, including multiple layers of first sub-retaining walls arranged along the height direction of the counterfort retaining wall, and adjacent two layers of the first sub-retaining walls are connected to each other; each first sub-retaining wall includes a first bottom plate, a first wall panel and multiple columns, the first wall panel and each column are arranged on the top side of the first bottom plate, each column is arranged at an interval with the first wall panel and is located on the side of the first wall panel facing the soil body, along the height direction of the counterfort retaining wall, the first bottom plate of the upper first sub-retaining wall supports and connects to the top ends of the first wall panel and each column of the lower first sub-retaining wall.

[0006] Further, the multiple columns are arranged at intervals along the longitudinal direction of the counterfort retaining wall.

[0007] Further, each layer of the first sub-retaining wall is a prefabricated part, and the multiple first sub-retaining walls are assembled successively from bottom to top.

[0008] Further, a tenon is formed at the top end of the first wall panel of the lower first sub-retaining wall, and a first hole is formed on the first bottom plate of the upper first sub-retaining wall, and the tenon is embedded into the first hole to connect the first wall panel of the lower layer to the first bottom plate of the upper first sub-retaining wall.

[0009] Further, the number of the tenons on each of the first wall panels is multiple, and the multiple tenons are arranged at intervals along the longitudinal direction of the first wall panel; the number of the first holes is multiple, and each of the first holes is correspondingly arranged with one of the tenons.

[0010] Further, the multiple tenons on each of the first wall panels and the multiple struts are symmetrically arranged.

[0011] Further, the first bottom plate of the upper first sub-retaining wall has multiple second holes, and the top end of each of the struts of the lower first sub-retaining wall is embedded in one of the second holes to connect the strut with the first bottom plate of the upper first sub-retaining wall.

[0012] Further, the first sub-retaining wall further includes multiple first buttresses arranged inside the first wall panel, and the first buttresses are obliquely arranged between the first wall panel and the first bottom plate; the multiple first buttresses are arranged at intervals along the longitudinal direction of the first wall panel.

[0013] Further, one end of the projection of the first buttress on the first bottom plate connected thereto is connected to the projection of one of the tenons on the same first bottom plate.

[0014] Further, the first sub-retaining wall further includes a second buttress arranged on the side surface of the strut, one end of the second buttress is connected to the strut, and the other end is connected to the first bottom plate.

[0015] Further, the number of the second buttresses on the same strut is two, and the two second buttresses are respectively arranged oppositely on the transverse two sides of the strut.

[0016] Further, the buttress retaining wall further includes multiple layers of geogrids, and each geogrid is laid from one end of the first bottom plate close to the stable soil body into the stable soil body; the multiple layers of geogrids are arranged at intervals along the height direction of the buttress retaining wall.

[0017] Further, multiple third holes are formed on the first bottom plate, and the multiple third holes are arranged at intervals on the first bottom plate.

[0018] Further, the buttress retaining wall further includes a second sub-retaining wall, and the second sub-retaining wall is installed on the first sub-retaining wall at the top end of the buttress retaining wall; the second sub-retaining wall includes a second bottom plate and a second wall panel, the second wall panel is arranged on the top side of the second bottom plate, and the second bottom plate supports and is connected to the first wall panel of the lower first sub-retaining wall and the top ends of the respective struts.

[0019] The counterfort retaining wall provided by the present invention is a prefabricated and assembled retaining wall, which can be prefabricated in a factory and then assembled on site. Compared with the traditional counterfort retaining wall or gravity retaining wall, without increasing the amount of masonry work, the retaining height of the counterfort retaining wall is increased, the construction efficiency and construction quality are effectively improved, the construction period is saved, and the construction is less affected by weather factors, etc. In addition, a plurality of columns are added to the bottom plate of the retaining wall to form an integral structure with the first bottom plate and the first wall panel, which improves the overall mechanical properties of each first sub-retaining wall and effectively improves the anti-slip ability and self-stability of the counterfort retaining wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. is a schematic cross-sectional structure diagram of the counterfort retaining wall provided by an embodiment of the present invention;

[0021] Figure 2 FIG. is a schematic elevation structure diagram of the counterfort retaining wall provided by an embodiment of the present invention;

[0022] Figure 3 FIG. is a schematic longitudinal section structure diagram of the counterfort retaining wall provided by an embodiment of the present invention.

[0023] DESCRIPTION OF REFERENCE NUMERALS:

[0024] 10. First sub-retaining wall; 11. First bottom plate; 11a. Third hole; 12. First wall panel; 12a. Tenon; 13. Column; 14. First counterfort; 15. Second counterfort;

[0025] 20. Second sub-retaining wall; 21. Second bottom plate; 22. Second wall panel;

[0026] 30. Geogrid. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. In the description of the present invention, the relevant orientation or positional relationship is based on Figure 1 the orientation or positional relationship shown, wherein, "up" and "down" refer to Figure 1 the up and down directions of

[0028] In addition, descriptions such as "first" and "second" in the present invention are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity or order of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] Referring to Figures 1 to 3 , an embodiment of the present application provides a counterfort retaining wall, which includes multiple layers of first sub-retaining walls 10. The multiple layers of first sub-retaining walls 10 are arranged along the height direction of the counterfort retaining wall, and adjacent two layers of first sub-retaining walls 10 are connected to each other. Each first sub-retaining wall 10 includes a first bottom plate 11, a first wall panel 12, and a plurality of columns 13. The first wall panel 12 and each column 13 are both arranged on the top side of the first bottom plate 11. Each column 13 is arranged at an interval from the first wall panel 12 and is located on the side of the first wall panel 12 facing the soil body. Along the height direction of the counterfort retaining wall, the first bottom plate 11 of the upper first sub-retaining wall 10 supports and connects to the first wall panel 12 of the lower first sub-retaining wall 10 and the top ends of each column 13.

[0030] In the embodiment of the present application, along the height direction of the counterfort retaining wall, the multiple layers of first sub-retaining walls 10 are connected to each other, effectively increasing the height of the counterfort retaining wall. Among them, the first wall panel 12 and the plurality of columns 13 of the same first sub-retaining wall 10 are respectively arranged on the top side of the first bottom plate 11. The specific connection method is: the first bottom plate 11 of the upper first sub-retaining wall 10 is connected to the first wall panel 12 of the lower first sub-retaining wall 10 and the top ends of the plurality of columns 13. It can be understood that there are many connection methods between the first bottom plate 11 of the upper first sub-retaining wall 10 and the first wall panel 12 and the plurality of columns 13 of the lower first sub-retaining wall 10, such as plugging, riveting, etc.

[0031] In addition, the connection manners of the first wall panel 12, the plurality of struts 13 and the first bottom plate 11 of the same first sub-retaining wall 10 may also be plug connection, riveting, casting together, etc. Therefore, the plurality of first sub-retaining walls 10 can be prefabricated in a factory, and the plurality of first sub-retaining walls 10 can be assembled together on site. That is to say, in some embodiments, each layer of the first sub-retaining walls 10 is a prefabricated component, and the plurality of first sub-retaining walls 10 are assembled successively from bottom to top. The first bottom plate 11, the first wall panel 12 and the plurality of struts 13 of each layer of the first sub-retaining walls 10 can be prefabricated components respectively, and are transported to the site for assembly into the first sub-retaining wall 10 after factory prefabrication. In another case, the first sub-retaining wall 10 can also be a prefabricated component. A plurality of first sub-retaining walls 10 are prefabricated in a factory and transported to the site, and then the plurality of first sub-retaining walls 10 are assembled from bottom to top. To ensure the structural stability and safety of the counterfort retaining wall in the embodiments of the present application, and considering the requirements for the bearing capacity of the foundation and the force requirements of each connection part of the counterfort retaining wall, the height of the counterfort retaining wall in the present application should not be greater than 15 m.

[0032] Specifically, the longitudinal length of the first bottom plate 11 is 2 m to 6 m. The thickness of the first bottom plate 11 is determined according to the height and load calculation of the counterfort retaining wall, and should not be less than 0.3 m; the length along the transverse direction of the counterfort retaining wall is not less than 3 m to meet the layout requirements of the first wall panel 12 and the struts 13, and at the same time reduce the requirements for the bearing capacity of the foundation. In some embodiments, the strut 13 is a single reinforced concrete column, and the height is preferably 1.5 m to 2.5 m, and the cross-sectional size should not be less than 0.3 m×0.3 m. The struts 13 can be arranged at an interval of 1.3 m along the longitudinal direction, and the spacing of the struts 13 is specifically adjusted according to the actual project. The vertical distance between the side surface of the strut 13 close to the soil body and the corresponding end of the first bottom plate 11 is not less than 0.5 m to improve the ability of the first bottom plate 11 to bear the earth pressure behind the retaining wall and reduce the lateral earth pressure received by the struts 13. In some embodiments, the height of the first wall panel 12 is 0.2 m smaller than the height of the strut 13. Specifically, the first wall panel 12 is a reinforced concrete structure. The first wall panel 12 can be cast together with the first bottom plate 11.

[0033] In the embodiments of the present application, for the same first sub-retaining wall 10, the plurality of struts 13 and the first wall panel 12 are arranged at intervals, and the plurality of struts 13 are located on the side of the first bottom plate 11 close to the soil body, that is, on the side of the first wall panel 12 facing the soil body. The first bottom plate 11, the first wall panel 12 and the plurality of struts 13 form an integral structure similar to a cuboid, enabling the first sub-retaining wall 10 to be stressed as a whole and improving the stress characteristics of the first sub-retaining wall 10.

[0034] The counterfort retaining wall provided by the embodiment of the present application is a prefabricated and assembled retaining wall, which can be prefabricated in a factory and then assembled on site. Compared with the traditional counterfort retaining wall or gravity retaining wall, without increasing the amount of masonry work, the retaining height of the counterfort retaining wall is increased, the construction efficiency and construction quality are effectively improved, the construction period is saved, and the construction is less affected by weather factors, etc. In addition, a plurality of columns 13 are provided on the bottom plate of the retaining wall, so that an integral structure is formed with the first bottom plate 11 and the first wall panel 12, the overall stress characteristics of each first sub-retaining wall 10 are improved, and the anti-slip ability and self-stability of the counterfort retaining wall are effectively improved.

[0035] In some embodiments, the plurality of columns 13 are arranged at intervals along the longitudinal direction of the counterfort retaining wall. It can be understood that the plurality of columns 13 are arranged longitudinally. Generally, the first wall panel 12 is also arranged longitudinally, that is, the plurality of columns 13 are respectively arranged at equal intervals relative to the first wall panel 12, which enhances the supporting effect of the lower first sub-retaining wall 10 on the upper first sub-retaining wall 10, and effectively improves the self-stability of the counterfort retaining wall. In addition, the plurality of columns 13 are arranged at intervals, and on the basis of meeting the supporting effect on the upper first sub-retaining wall 10, the number of columns 13 is effectively reduced, and the cost is reduced.

[0036] In some embodiments, a tenon 12a is formed at the top end of the first wall panel 12 of the lower first sub-retaining wall 10, and a first hole is provided on the first bottom plate 11 of the upper first sub-retaining wall 10. The tenon 12a is embedded in the first hole to connect the lower first wall panel 12 and the first bottom plate 11 of the upper first sub-retaining wall 10. It can be understood that the tenon 12a on the lower first wall panel 12 is embedded in the first hole of the upper first bottom plate 11 to connect the two, so as to facilitate the assembly between adjacent two layers of first sub-retaining walls 10. The connection relationship between the tenon 12a and the first hole makes the connection between adjacent two layers of first sub-retaining walls 10 more stable. That is to say, the tenon 12a at the top end of the lower first wall panel 12 cooperates with the first hole of the upper first bottom plate 11. The depth of the first hole is not less than 0.2 m, and the cross-sectional dimension is preferably 1 cm to 5 cm larger than the dimension of the tenon 12a.

[0037] Further, the number of tenons 12a on each first wall panel 12 is multiple, and the multiple tenons 12a are arranged at intervals along the longitudinal direction of the first wall panel 12; the number of first holes is multiple, and each first hole is correspondingly arranged with a tenon 12a. It can be understood that the tenons 12a are arranged longitudinally along the first wall panel 12, which is beneficial to enhancing the connection relationship between the first wall panel 12 and the upper first bottom plate 11. The multiple tenons 12a are arranged at intervals, effectively reducing the number of tenons 12a on the premise of ensuring the connection function between the first wall panel 12 and the upper first bottom plate 11, and facilitating processing and assembly. Specifically, the multiple tenons 12a on each first wall panel 12 and the multiple struts 13 are symmetrically arranged. The multiple tenons 12a at the top of the same first wall panel 12 and the multiple struts 13 are symmetrically arranged, which can further enhance the supporting effect of the first wall panel 12 and the struts 13 on the upper first bottom plate 11 and improve the overall stability of the counterfort retaining wall. That is to say, a tenon 12a is arranged every 1.3 m longitudinally on the same first wall panel 12. The spacing can be specifically adjusted according to the actual project. The height of the tenon 12a is not less than 0.2 m.

[0038] In some embodiments, the first bottom plate 11 of the upper first sub-retaining wall 10 has multiple second holes, and the top end of each strut 13 of the lower first sub-retaining wall 10 is embedded in a second hole to connect the strut 13 with the first bottom plate 11 of the upper first sub-retaining wall 10. It can be understood that for the connection method between the strut 13 and the upper first bottom plate 11, it is preferred that the top end of the strut 13 is embedded in the second hole of the upper first bottom plate 11, so as to facilitate the connection between the two and the assembly of the two during assembly. Specifically, the depth of the second hole is not less than 0.2 m, and the size of the strut 13 embedded in the second hole is also not less than 0.2 m.

[0039] In some embodiments, the first sub-retaining wall 10 further includes multiple first counterforts 14 arranged on the inner side of the first wall panel 12, and the first counterforts 14 are obliquely arranged between the first wall panel 12 and the first bottom plate 11; the multiple first counterforts 14 are arranged at intervals along the longitudinal direction of the first wall panel 12. In the embodiments of the present application, the multiple first counterforts 14 are arranged longitudinally at intervals, which can support the first wall panel 12 in stages and enhance the stability and shear resistance of the first wall panel 12. Specifically, a first counterfort 14 is arranged every 1.3 m longitudinally. It can be specifically adjusted according to the actual project requirements.

[0040] Further, one end of the projection of the first counterfort 14 on the first bottom plate 11 connected thereto is connected to the projection of a tenon 12a on the same first bottom plate 11. That is to say, the longitudinal position of the first counterfort 14 along the first wall panel 12 is the same as the longitudinal position of the tenon 12a along the first wall panel 12. At this time, the first counterfort 14 can better enhance the stability and shear resistance at the connection between the first wall panel 12 and the upper first bottom plate 11.

[0041] In some embodiments, the first sub-retaining wall 10 further includes a second buttress 15 disposed on the side of the pillar 13. One end of the second buttress 15 is connected to the pillar 13, and the other end is connected to the first bottom plate 11. In each first sub-retaining wall 10, a second buttress 15 is disposed between the pillar 13 and the first bottom plate 11. The second buttress 15 enhances the stability and shear resistance of the pillar 13. Further, the number of second buttresses 15 on the same pillar 13 is two, and the two second buttresses 15 are respectively disposed on the transverse two sides of the pillar 13 relatively. It can be understood that one second buttress 15 is disposed on each of the two transverse sides of the same pillar 13, which can enhance the supporting effect on the pillar 13, and at the same time further improve the balance stability and shear resistance of the pillar 13.

[0042] In some embodiments, the counterfort retaining wall further includes multiple layers of geogrids 30. Each geogrid 30 is laid from one end of the first bottom plate 11 close to the stable soil body into the stable soil body; the multiple layers of geogrids 30 are arranged at intervals along the height direction of the counterfort retaining wall. Refer to Figure 1 , the dotted line part is the rupture surface that may be formed by the backfill soil of the retaining wall obtained by calculation. Each project needs to be analyzed and calculated according to the specific soil mechanical properties. Considering the situation of the rupture surface, in order to effectively reduce the actual earth pressure of the soil behind the retaining wall on the retaining wall, geogrids 30 are provided at the first bottom plate 11 of each layer of the first sub-retaining wall 10. Specifically, one end of the geogrid 30 is located at the end of the first bottom plate 11 close to the soil body, and the other end extends into the stable soil body. The geogrid 30 can enhance the bearing capacity of the soil behind the counterfort retaining wall. Extending into the stable soil body, part of the self-weight of the soil behind the retaining wall is converted into a part of the retaining wall, reducing the earth pressure of the soil behind the retaining wall on the retaining wall. The geogrids 30 are arranged at intervals in the height direction and can play a bearing role at different heights.

[0043] In some embodiments, a plurality of third holes 11a are formed on the first bottom plate 11, and the plurality of third holes 11a are arranged at intervals on the first bottom plate 11. It can be understood that the plurality of third holes 11a on the first bottom plate 11 can ensure the compactness of the soil filling and effectively enhance the ability of the counterfort retaining wall to adapt to the settlement of the fill. The third holes 11a may not be provided on the lowermost first bottom plate 11. Specifically, the spacing of the plurality of third holes 11a is 1.3 m, and the dimensions are 1.7 m in length and 0.5 m in width, which can be adjusted according to the actual project.

[0044] In some embodiments, the counterfort retaining wall further includes a second sub-retaining wall 20, which is installed on the first sub-retaining wall 10 at the top of the counterfort retaining wall; the second sub-retaining wall 20 includes a second bottom plate 21 and a second wall panel 22, the second wall panel 22 is arranged on the top side of the second bottom plate 21, and the second bottom plate 21 supports and connects to the top ends of the first wall panel 12 and each support column 13 of the lower-layer first sub-retaining wall 10. It can be understood that since the second sub-retaining wall 20 is arranged at the top of the counterfort retaining wall, there is no need to arrange the support columns 13. Compared with the first sub-retaining wall 10, the second sub-retaining wall 20 does not have the support columns 13 and the second counterforts 15. In addition, one end of the geogrid 30 corresponding to the second sub-retaining wall 20 is laid starting from the side of the second wall panel 22, and the other end extends into the stabilized soil mass.

[0045] The construction steps of the counterfort retaining wall in the embodiments of the present application are as follows:

[0046] 1. Treat the subgrade base so that the subgrade base meets the requirement of the minimum bearing capacity. At the same time, prefabricate the first sub-retaining wall 10 and the second sub-retaining wall 20 in the factory.

[0047] 2. Transport the prefabricated parts of the first sub-retaining wall 10 and the second sub-retaining wall 20 to the construction site, and use devices such as a crane to fix and install the lowermost first sub-retaining wall 10. Construction is carried out in longitudinal sections along the embankment, and the longitudinal length of each section is not less than 20 m.

[0048] 3. After the construction of the first sub-retaining wall 10 is completed, fill and compact the soil mass behind the retaining wall in layers. The filling height of the soil mass is equal to the top of the first wall panel 12, or the filling height of the soil mass is slightly higher than the top of the first wall panel 12 by 1 cm to 5 cm. Then lay the geogrid 30.

[0049] 4. Assemble multiple first sub-retaining walls 10 from bottom to top and fill the soil mass and lay the geogrid 30 respectively.

[0050] 5. After the construction of the first sub-retaining wall 10 is completed, assemble the second sub-retaining wall 20 on the top of the uppermost first sub-retaining wall 10, and fill and compact the soil mass behind the retaining wall, and lay the uppermost geogrid 30 to complete the construction of the counterfort retaining wall.

[0051] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Moreover, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions appears to be contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims described above.

Claims

1. A counterfort retaining wall, characterized in that: It includes multiple layers of first sub-retaining walls, and the multiple layers of the first sub-retaining walls are arranged along the height direction of the counterfort retaining wall, and adjacent two layers of the first sub-retaining walls are connected to each other; Each of the first sub-retaining walls includes a first bottom plate, a first wall panel and multiple columns. The first wall panel and each column are arranged on the top side of the first bottom plate. Each column is arranged at an interval from the first wall panel and is located on the side of the first wall panel facing the soil mass. Along the height direction of the counterfort retaining wall, the first bottom plate of the upper first sub-retaining wall supports and is connected to the top ends of the first wall panel and each column of the lower first sub-retaining wall; The multiple columns are arranged at intervals along the longitudinal direction of the counterfort retaining wall; Multiple third holes are formed on the first bottom plate, and the multiple third holes are arranged at intervals along the longitudinal direction of the counterfort retaining wall on the first bottom plate; The counterfort retaining wall further includes multiple layers of geogrids. Each geogrid is laid from one end of the first bottom plate close to the stable soil mass into the stable soil mass; the multiple layers of geogrids are arranged at intervals along the height direction of the counterfort retaining wall.

2. The counterfort retaining wall according to claim 1, characterized in that, Each layer of the first sub-retaining wall is a precast member, and the multiple first sub-retaining walls are assembled in sequence from bottom to top.

3. The counterfort retaining wall according to claim 1, characterized in that, A tenon is formed at the top end of the first wall panel of the lower first sub-retaining wall, and a first hole is formed on the first bottom plate of the upper first sub-retaining wall. The tenon is embedded into the first hole to connect the first wall panel of the lower layer to the first bottom plate of the upper first sub-retaining wall.

4. The counterfort retaining wall according to claim 3, wherein The number of the tenons on each first wall panel is multiple, and the multiple tenons are arranged at intervals along the longitudinal direction of the first wall panel; the number of the first holes is multiple, and each first hole is arranged corresponding to a tenon.

5. The counterfort retaining wall according to claim 3, characterized in that, The multiple tenons on each first wall panel and the multiple columns are symmetrically arranged.

6. The counterfort retaining wall according to claim 1, characterized in that, Multiple second holes are formed on the first bottom plate of the upper first sub-retaining wall, and the top end of each column of the lower first sub-retaining wall is embedded into a second hole to connect the column to the first bottom plate of the upper first sub-retaining wall.

7. The counterfort retaining wall according to claim 3, wherein The first sub-retaining wall further includes multiple first counterforts arranged on the inner side of the first wall panel. The first counterforts are obliquely arranged between the first wall panel and the first bottom plate; the multiple first counterforts are arranged at intervals along the longitudinal direction of the first wall panel.

8. The counterfort retaining wall according to claim 7, wherein One end of the projection of the first counterfort on the first bottom plate connected thereto is connected to the projection of a tenon on the same first bottom plate.

9. The counterfort retaining wall according to any one of claims 1 to 6, characterized in that, The first sub-retaining wall further includes a second counterfort arranged on the side surface of the column. One end of the second counterfort is connected to the column, and the other end is connected to the first bottom plate.

10. The counterfort retaining wall according to claim 9, characterized in that, The number of the second counterforts on the same column is two, and the two second counterforts are respectively arranged oppositely on the transverse two sides of the column.

11. The counterfort retaining wall according to any one of claims 1 to 6, characterized in that, The counterfort retaining wall further includes a second sub-retaining wall, and the second sub-retaining wall is installed on the first sub-retaining wall at the top end of the counterfort retaining wall; The second sub-retaining wall includes a second bottom plate and a second wall panel. The second wall panel is arranged on the top side of the second bottom plate. The second bottom plate supports and is connected to the top ends of the first wall panel and each column of the lower first sub-retaining wall.

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