Overhanging eave type layered grid pre-stressed anchor cable retaining wall and construction method thereof

Abstract

The invention provides a cornice type layered grid pre-stressed anchor cable retaining wall and a construction method thereof, and belongs to the technical field of retaining walls. The invention comprises: a foundation; the reinforced concrete panel wall is arranged on the foundation, a plurality of cornices are arranged on the face, close to the slope body, of the reinforced concrete panel wall at intervals, and cornice reserved areas are formed at the cornices; the steel casing pipe is arranged on the face, close to the slope body, of the reinforced concrete panel wall; the geogrids are connected with the steel casing pipes through extension springs and located between the adjacent cornices; the cornice geogrid is arranged in the cornice reserved area, one end of the cornice geogrid is connected with the cornice reserved area, and the other end of the cornice geogrid is connected with the slope body; one end of the pre-stressed anchor cable is connected with the reinforced concrete panel wall, and the other end is connected with the slope body; and the filler is filled between the reinforced concrete panel wall and the slope body. Through the combination of the cornice type design, the layered grids and the pre-stressed anchor cables, the overall stability and the anti-overturning capacity of the retaining wall can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of retaining walls, and in particular to an overhanging eaves type layered grid prestressed anchor cable retaining wall and a construction method thereof. Background Art

[0002] Traditional retaining wall designs usually use continuous concrete walls or gravity retaining walls. These designs have certain advantages in bearing soil pressure and shear force, but they also have problems such as heavy structure, complex construction and poor soil drainage.

[0003] Layered grid retaining walls are gradually being used in retaining wall design due to their flexible structure and good drainage performance. However, the existing layered grid retaining walls still have room for improvement in terms of structural stability and service life.

[0004] The cost of materials such as geogrids and eco-bags required for the reverse geogrid is high, which will increase the project investment cost and affect the economic benefits. In addition, although the reverse geogrid has strong durability and stability, it still needs regular maintenance and inspection during long-term use. In particular, the damage and aging of external structures such as eco-bags need to be dealt with in a timely manner. This may increase the difficulty and cost of later maintenance.

[0005] The application of prestressed anchor cable technology in retaining walls has gradually attracted attention. Prestressed anchor cables improve the stability and bearing capacity of retaining walls by applying prestress, thereby reducing the thickness of the wall, reducing the amount of materials used, and reducing the construction cost. However, traditional prestressed anchor cable retaining walls still face some problems in practical applications, such as the arrangement of anchor cables, construction quality control, and stability issues in long-term use. Summary of the invention

[0006] In view of this, in order to solve the above-mentioned deficiencies in the prior art, on the one hand, the present invention provides a cantilevered layered grid prestressed anchor retaining wall, which can effectively improve the overall stability and anti-overturning ability of the retaining wall by combining the cantilevered design, layered grid and prestressed anchor.

[0007] To achieve the above object, the present invention provides the following technical solutions: A cantilevered layered grid prestressed anchor cable retaining wall, comprising: Base; A reinforced concrete panel wall is arranged on the foundation, and a plurality of overhanging eaves are arranged at intervals on one side close to the slope, and an overhanging eaves reserved area is formed at the overhanging eaves; A steel casing, which is arranged on one side of the reinforced concrete panel wall close to the slope; A geogrid connected to the steel casing via a tension spring and located between adjacent overhanging eaves; An overhanging eaves geogrid is arranged in the overhanging eaves reserved area, one end of which is connected to the overhanging eaves reserved area, and the other end of which is connected to the slope; A prestressed anchor cable, one end of which is connected to the reinforced concrete panel wall, and the other end of which is connected to the slope; Filling material is filled between the reinforced concrete panel wall and the slope.

[0008] Preferably, the overhanging eaves geogrid is connected to the overhanging eaves reserved area via a connecting device; The connecting device comprises: The clamping plate is used to clamp the overhanging eaves geogrid on the overhanging eaves and then fasten it by bolts.

[0009] Preferably, anchor holes are provided on the reinforced concrete panel wall.

[0010] Preferably, the anchor rod in the prestressed anchor cable is connected to the reinforced concrete panel wall through the anchor hole.

[0011] Preferably, drainage holes are also provided on the reinforced concrete panel wall.

[0012] Preferably, the vertical direction of the eaves is fixed by a latch Preferably, the steel sleeve and the tension spring are connected by hook connection.

[0013] Preferably, the geogrid is a polyester or polypropylene geogrid.

[0014] Preferably, the eaves are reinforced.

[0015] On the other hand, the present invention provides a construction method for the above-mentioned cantilevered layered grid prestressed anchor cable retaining wall, comprising the following steps: Step 1), excavate the foundation; Step 2), install the reinforced concrete panel wall on the foundation, fill and compact the soil, lay the geogrid, one end of the geogrid is connected to the foundation, and the other end is fixed on the compacted fill soil; Step 3) gradually fill and compact the filler until the eaves are located, and then lay the eaves geogrid. One end of the eaves geogrid is connected to the eaves reserved area, and the other end is connected to the original slope. Step 4), repeat steps 2) and 3) from bottom to top until the design height of the entire retaining wall; Step 5) Install the prestressed anchor cable, connect one end of it to the reinforced concrete panel wall and the other end to the slope, apply prestress, adjust the prestress size, ensure that it meets the design requirements, seal the anchor and complete the construction.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1) Strong structural stability: The overall stability and anti-overturning ability of the retaining wall are effectively improved by adopting a cantilevered eaves design, a combination of layered grids and prestressed anchor cables.

[0017] 2) Uniform stress distribution: Prestressed anchor cables can evenly distribute the stress between the soil and the wall, reduce local stress concentration, and thus reduce the risk of wall deformation and cracks.

[0018] 3) Simple construction: The retaining wall of the present invention adopts prefabricated components, and the layered grid and cantilevered eaves design simplifies the construction process and reduces the construction difficulty and cost.

[0019] 4) Long service life: Prestressed anchor cables and excellent drainage performance improve the durability of the retaining wall and extend its service life.

[0020] 5) Good structural flexibility: The high-strength tension spring device can allow a certain degree of relative displacement, which can reduce the stress concentration caused by settlement or displacement, thereby improving the flexibility and stability of the entire structure.

[0021] 6) Strong adaptability: This structure is suitable for various geological conditions, especially for loose soil and soft foundation, and can effectively cope with different soil pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of the present invention; Figure 2 It is a schematic diagram of the outer surface structure of the present invention; Figure 3 It is a schematic diagram of the inner surface structure of the present invention; Figure 4 This is a schematic diagram of the structure of the geogrid mechanically embedded in the eaves area; Figure 5 This is a schematic diagram of the structure of the vertical latch at the eaves; Figure 6 It is a plan view of a high-strength tension spring; In the figure, 1. foundation; 2. reinforced concrete panel wall; 3. steel casing; 4. geogrid; 5. anchor rod; 6. filler; 7. drainage hole; 8. anchor hole; 9. latch; 10. tension spring; 11. bolt; 12. clamping plate; 13. eaves; 14. eaves geogrid. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] like Figure 1-6 As shown, the present invention provides a cantilevered layered grid prestressed anchor cable retaining wall, comprising: Foundation 1; A reinforced concrete panel wall 2 is arranged on the foundation 1, and a plurality of overhangs 13 are arranged at intervals on one side close to the slope, and the overhangs 13 form an overhang reserved area; the reinforced concrete panel wall 2 is preferably embedded in the foundation 1; A steel casing 3, which is arranged on one side of the reinforced concrete panel wall 2 close to the slope; The geogrid 4 has one end connected to the steel casing 3 via a tension spring 10, and the other end is preferably fixed to the compacted fill or filler 6 via a fixing device, wherein the fixing device is preferably a nail. The geogrid 4 is preferably located between the adjacent overhangs 13; The overhanging eaves geogrid 14 is arranged in the overhanging eaves reserved area, one end of which is connected to the overhanging eaves reserved area (preferably embedded in the overhanging eaves reserved area), and the other end of which is connected to the slope; A prestressed anchor cable, one end of which is connected to the reinforced concrete panel wall 2, and the other end is connected to the slope; wherein the prestressed anchor cable preferably includes an anchor rod 5 and a high-strength steel wire or steel strand, and prestress is applied by the high-strength steel wire or steel strand; Filler 6 is filled between the reinforced concrete panel wall 2 and the slope.

[0027] In the present invention, the overhanging eaves geogrid 14 is connected to the overhanging eaves reserved area through a connecting device; The connecting device comprises: The clamping plate 12 is used to clamp the eaves geogrid 14 on the eaves 13 and then fasten it by bolts 11, preferably horizontally fastened, and the eaves are fixed in the vertical direction by latches 9. That is, the upper and lower parts of the latch 9 are respectively fixed to the upper and lower sides of the eaves, and the insertion rod of the latch 9 is fixed through the grid holes of the geogrid.

[0028] In the present invention, anchor holes 8 are provided on the reinforced concrete panel wall 2. According to the specification requirements, the arrangement interval of the geogrid 4 is reasonably set, and the inclined anchor rods 5 can be arranged separately from the geogrid 4, or the anchor rods 5 can be arranged by passing through the geogrid 4 and tying.

[0029] In the present invention, the anchor rod 5 in the prestressed anchor cable is connected to the reinforced concrete panel wall 2 through the anchor hole 8.

[0030] In the northern invention, drainage holes 7 are also provided on the reinforced concrete panel wall 2, which provide excellent drainage performance for the retaining wall, improve the durability of the retaining wall, and extend the service life.

[0031] In the present invention, the connection method between the steel sleeve 3 and the tension spring 10 is a hook connection, wherein the tension spring 10 is preferably a high-strength tension spring 10.

[0032] In the present invention, the geogrid 4 is a polyester or polypropylene geogrid.

[0033] In the present invention, the overhanging eaves are reinforced.

[0034] On the other hand, the present invention provides a construction method for the above-mentioned cantilevered layered grid prestressed anchor cable retaining wall, comprising the following steps: Step 1), excavation foundation 1; Step 2), install the reinforced concrete panel wall 2 on the foundation 1, fill and compact the soil, lay the geogrid 4, one end of the geogrid 4 is connected to the foundation 1, and the other end is fixed on the compacted fill soil; Step 3), gradually fill the filler 6 and compact it until the eaves are located, and then lay the eaves geogrid 14, one end of the eaves geogrid 14 is connected to the eaves reserved area, and the other end is connected to the original slope; Step 4), repeat steps 2) and 3) from bottom to top until the design height of the entire retaining wall; Step 5), install the prestressed anchor cable, connect one end of it to the reinforced concrete panel wall 2, and the other end to the slope, apply prestress, adjust the prestress size, ensure that it meets the design requirements, seal the anchor, and the construction is completed.

[0035] The above construction method is as follows: 1) Construction preparation: Ensure that all designs comply with relevant specifications; prefabricate reinforced concrete panel wall 2, and reasonably arrange drainage holes 7, anchor holes 8, eaves reserved area, and steel casing 3 according to design requirements.

[0036] 2) Site cleaning: Remove obstacles, vegetation and surface soil in the construction area to ensure the flatness and firmness of the foundation. Conduct a land bearing capacity test to ensure that the foundation can withstand the design load.

[0037] 3) Construction of Foundation 1: excavate the foundation pit according to the designed depth and width, lay a cushion layer at the bottom of the foundation pit and compact it, tie the Foundation 1 steel mesh according to the design requirements, install reinforced concrete panel wall 2, pour the Foundation 1 concrete, vibrate and compact it to ensure the strength of Foundation 1.

[0038] 4) Reinforced soil construction: fill the filler 6 and compact it. When laying the geogrid, one end of the geogrid is connected to the steel casing 3 with a high-strength tension spring 10, and the other end is fixed to the compacted fill with a nail or other fixing device. Adjust the spring tension according to the design requirements, check whether the connection point and the device are firm and reliable, and ensure that the installation of the spring device meets the design requirements; 5) Gradually fill the filler 6 and compact it until it reaches the reserved area for the overhanging eaves, and lay the overhanging eaves geogrid 14. One end of the overhanging eaves geogrid 14 is mechanically embedded in the reserved area and fixed horizontally with high-strength bolts 11 and clamping plates 12, and fixed vertically with latches 9. The other end of the overhanging eaves geogrid 14 is embedded in the original slope and fixed with clamping plates 12 and fastening devices; 6) Repeat steps 4)-5) to complete the filling construction from bottom to top.

[0039] 7) Prestressed anchor cable construction: Anchor rods 5 are installed at the anchor holes 8 reserved on the reinforced concrete panel wall 2. The anchor cables are tensioned to the designed prestressing force through tensioning equipment. The tensioning force of each anchor cable is checked and the anchors are sealed after meeting the design requirements.

[0040] 8) Completion acceptance: Carry out a comprehensive inspection of the entire retaining wall. After passing the acceptance, organize the construction records, test reports, material certificates, etc. to complete the acceptance.

[0041] In the above arrangement of the anchor rods 5, if the requirements of the specification are met, the anchor rods 5 and the geogrid can be arranged in layers, or the anchor rods 5 can be arranged by passing through the geogrid and tied together.

[0042] In the above technical solution provided by the present invention, the geogrid and / or the cantilever geogrid 14 is preferably an inverted geogrid, which wraps non-cohesive soil (filler 6) of different particle sizes to form an inverted filter layer, and the inverted filter layer is combined with the drainage hole 7 to ensure smooth drainage. Expansion joints are set in the retaining wall and filled with materials such as asphalt hemp tendons to adapt to the uneven settlement of the soil.

[0043] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cantilevered layered grid prestressed anchor cable retaining wall, characterized in that: include: Base; A reinforced concrete panel wall is arranged on the foundation, and a plurality of overhanging eaves are arranged at intervals on one side close to the slope, and an overhanging eaves reserved area is formed at the overhanging eaves; A steel casing, which is arranged on one side of the reinforced concrete panel wall close to the slope; A geogrid connected to the steel casing via a tension spring and located between adjacent overhanging eaves; An overhanging eaves geogrid is arranged in the overhanging eaves reserved area, one end of which is connected to the overhanging eaves reserved area, and the other end of which is connected to the slope; A prestressed anchor cable, one end of which is connected to the reinforced concrete panel wall, and the other end of which is connected to the slope; Filling material is filled between the reinforced concrete panel wall and the slope.

2. The cantilevered layered grid prestressed anchor cable retaining wall according to claim 1, characterized in that: The overhanging eaves geogrid is connected to the overhanging eaves reserved area via a connecting device; The connecting device comprises: The clamping plate is used to clamp the overhanging eaves geogrid on the overhanging eaves and then fasten it by bolts.

3. The cantilevered layered grid prestressed anchor cable retaining wall according to claim 1, characterized in that: Anchor holes are provided on the reinforced concrete panel wall.

4. The cantilevered layered grid prestressed anchor cable retaining wall according to claim 3 is characterized in that: The anchor rods in the prestressed anchor cables are connected to the reinforced concrete panel wall through the anchor holes.

5. The cantilevered layered grid prestressed anchor cable retaining wall according to claim 1, characterized in that: The reinforced concrete panel wall is also provided with drainage holes.

6. The cantilevered layered grid prestressed anchor cable retaining wall according to claim 1, characterized in that: The eaves are fixed in vertical direction by means of latches.

7. The cantilevered layered grid prestressed anchor cable retaining wall according to claim 1, characterized in that: The connection mode of the steel casing and the tension spring is a hook connection.

8. The cantilevered layered grid prestressed anchor cable retaining wall according to claim 1, characterized in that: The geogrid is a polyester or polypropylene geogrid.

9. A cantilevered layered grid prestressed anchor cable retaining wall according to any one of claims 1 to 8, characterized in that: The eaves are reinforced.

10. A construction method for a cantilevered layered grid prestressed anchor cable retaining wall according to any one of claims 1 to 9, characterized in that: The steps include: Step 1), excavate the foundation; Step 2), install the reinforced concrete panel wall on the foundation, fill and compact the soil, lay the geogrid, one end of the geogrid is connected to the foundation, and the other end is fixed on the compacted fill soil; Step 3) gradually fill and compact the filler until the eaves are located, and then lay the eaves geogrid. One end of the eaves geogrid is connected to the eaves reserved area, and the other end is connected to the original slope. Step 4), repeat steps 2) and 3) from bottom to top until the design height of the entire retaining wall; Step 5) Install the prestressed anchor cable, connect one end of it to the reinforced concrete panel wall and the other end to the slope, apply prestress, adjust the prestress size, ensure that it meets the design requirements, seal the anchor and complete the construction.

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