A construction method of slope engineering embedded support

Abstract

The application discloses a kind of slope engineering embedded support construction methods, mainly first to the irregular slope of slope main overbreak portion is adjusted and forms embedded area, embedded support structure is arranged in the embedded area, the embedded support structure is supported to slope main body using multilayer stepped structure, main step is using multilayer stepped layer-by-layer filling support layer, so guarantee that overbreak slope can be effectively filled after slope engineering overbreak, overbreak slope can be effectively filled by establishing similar dam type embedded support structure, meet the slope of design drawing requirement, and more stable than original soil, eliminate slope quality safety hazard;Meanwhile similar dam type embedded support structure is using multilayer stepped layer-by-layer filling support layer, greatly reduce the difficulty when construction.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for slope engineering patching and support construction and its construction method. Background Technology

[0002] In mountain construction projects, before formal development and construction, it is necessary to excavate the mountain. During the excavation of the slope of mountain construction, due to the complex geological conditions at the construction site, the distribution of rock layers, the large amount of boulders and their hard texture, in order to ensure the safety of subsequent construction, it is necessary to remove the huge boulders on the slope surface. However, after the removal of boulders, large-scale over-excavation is likely to occur. That is, large-scale over-excavation often occurs due to the need to remove huge boulders on the slope surface or due to improper operation during the earthwork excavation process. When the slope ratio (that is, the ratio of the vertical height to the horizontal width of the slope is called slope or slope ratio) is steep and the slope has a large drop, if the earthwork is directly backfilled, it is easy to cause the hole to collapse during the construction of the slope anchor cable drilling. In addition, the slope surface may collapse due to rainwater erosion. Therefore, permanent slope support is required for the safety of subsequent construction. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to propose a slope engineering patching and support construction method and construction method, which is applicable to patching measures after large-area over-excavation of permanent slope engineering.

[0004] To achieve this objective, the present invention adopts the following technical solution: The present invention provides a method for slope engineering patching and support construction, comprising the following steps: S00: Adjust the irregular slope of the over-excavated part of the main slope to make the slope ratio of the adjusted slope gentler than 1:0.2. At the same time, remove some loose soil on the slope to form a patching area, and set up a patching support structure in the patching area. S10: A reinforcing bar is provided at the bottom of the patching area. The patching support structure first opens a hole at the bottom of the patching area to match the reinforcing bar, grouts are injected into the hole and then the reinforcing bar is installed. The reinforcing bar extends into the soil along the hole, and the exposed length of the reinforcing bar is equal to the length extended into the soil. S20: Several pressure-dispersing anchor cables are provided within the main body of the slope. Each pressure-dispersing anchor cable includes a free section and an anchoring section. The anchoring section is embedded within the main body of the slope, and the free section is embedded within the patching support structure. S30: The patching support structure uses sandbags to pile up at the bottom of the patching area away from the slope to form a piled-up part, and a support layer is formed between the piled-up part and the slope. The support layer is filled with cement slurry, and the piled-up part is filled with fine stone concrete or cement mortar. S40: After the cement slurry in the bottom support layer of the patching area hardens, several support layers are filled and installed layer by layer from the bottom of the patching area to the top in accordance with the method of step S30. The several support layers are in a stepped shape from the bottom of the patching area to the top.

[0005] The beneficial effects of this invention are as follows: (1) This construction method can ensure that after the slope project is over-excavated, the over-excavated slope surface can be effectively filled by building a dam-like interlocking support structure, which meets the requirements of the design drawings and is more stable than the original soil, thus eliminating potential safety hazards to the slope quality. (2) The dam-like interlocking support structure adopts a multi-layered stepped interlocking support layer, which greatly reduces the difficulty of construction. (3) Buffer connectors in a matrix layout are also provided between two adjacent support layers to enhance the shear capacity between the two adjacent support layers, thereby improving the performance of the multi-layer stepped support layer in bearing the main pressure of the slope. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structural principle before slope treatment provided in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the structural principle of the slope treatment provided in a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the structural principle of the support layer before it is filled, provided in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the structural principle of the support layer after filling provided in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the structural principle of the support layer after filling provided in Embodiment 2 of the present invention; Figure 6 yes Figure 5 Enlarged diagram of A in the middle; Figure 7 This is a schematic diagram of the layout structure of the buffer connector in the support layer provided in Embodiment 2 of the present invention.

[0007] In the picture: 1. Main body of the slope; 11. Slope; 12. Patch area; 121. Insertion hole; 2. Interlocking support structure; 21. Inserted reinforcing bars; 22. Pressure-dispersing anchor cables; 221. Free section; 222. Anchoring section; 23. Stacking section; 24. Support layer; 25. Flexible drainage pipe; 26. Repair layer; 3. Buffer connector; 31. Abdominal strip; 32. End strip. Detailed Implementation

[0008] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0009] To address situations where large boulders need to be removed from slopes or where significant over-excavation occurs due to improper operation during earthwork excavation, and to ensure the safety of subsequent construction, permanent slope support is required for over-excavated slopes. Therefore, this invention, based on practical engineering applications, provides a slope engineering patching support construction method. The main concept is to construct a dam-like structure, treating the over-excavated slope as flowing water and the patching support structure 2 as a dam to intercept the flow. The patching support structure 2 is used to prevent slope collapse and ensure the safety of subsequent construction.

[0010] Example 1: Before slope protection construction, ensure the slope is laid out according to the design drawings and the surface is flat. The surface soil should be undisturbed. Step S00 involves adjusting the irregular slope 11 of the over-excavated portion of the main slope 1, making the slope ratio of the adjusted slope 11 gentler than 1:0.2. This ensures that the subsequent filling material can tightly bond with the slope 11 under gravity. Simultaneously, some loose soil on the slope 11 is removed to form a filling area 12, within which a filling support structure 2 is installed. Thus, after completion... After the initial treatment of the over-excavated portion of the main slope 1 is completed, the installation of the patching support structure 2 can continue within the patching zone 12. The installation of the patching support structure 2 proceeds from the bottom to the top of the patching zone 12. The main structural shape is a multi-layered stepped support layer 24, similar to a dam, set within the patching zone 12. To ensure ease of construction and safety, the support layer 24 is installed layer by layer from the bottom to the top of the patching zone 12. Specifically, the installation of the patching support structure 2 includes the following steps: Before setting the multi-layer support layer 24, a reinforcement structure is needed to strengthen the connection between the support layer 24 and the slope body 1 to enhance the bearing capacity of the support layer 24 under the pressure applied to the slope body 1. This reinforcement structure mainly includes a side fastening structure for the support layer 24 and the slope 11, and a bottom fastening structure for the support layer 24 and the bottom of the patching area 12. That is, S10: a reinforcing bar 21 is set at the bottom of the patching area 12, and the patching support structure 2 is first set at the bottom of the patching area 12. Insertion holes 121 are made to accommodate the reinforcing bars 21. Grout is injected into the insertion holes 121, and then the reinforcing bars are installed. The reinforcing bars 21 extend into the soil along the insertion holes 121, with the exposed length of the reinforcing bars 21 being equal to the length extending into the soil; and the exposed length of the reinforcing bars 21 and the length extending into the soil are not less than 1000 mm. In this way, the bottom fastening structure can fasten the bottom of the bottom support layer 24 and the bottom of the patching area 12, so that when the multi-layer support layer 24 is subjected to the pressure of the slope body 1, the reinforcing bars 21 can effectively further prevent the multi-layer support layer 24 from collapsing. Outer shift, S20: Several pressure-dispersing anchor cables 22 are installed within the main slope body 1. Each pressure-dispersing anchor cable 22 includes a free section 221 and an anchoring section 222. The anchoring section 222 is embedded into the main slope body 1, and the free section 221 is embedded into the patching support structure 2. The angle α between the pressure-dispersing anchor cable 22 and the horizontal plane is 25°, so as to pull the patching support structure 2 toward the main slope body 1. In this way, the multi-layer support layer 24 and the slope 11 can be firmly bonded together through the side fastening structure. In summary, after the pre-set reinforced support layer 2... After the structure is securely connected to the main body of the slope 1, multiple support layers 24 can be set layer by layer, i.e., step S30: the interlocking support structure 2 uses sandbags to pile up at the bottom of the interlocking area 12 away from the slope 11 to form a piled part 23, and the height of the piled part 23 is not greater than 1m. A support layer 24 is formed between the piled part 23 and the slope 11. The support layer 24 is filled with cement slurry, and the piled part 23 is filled with fine stone concrete or cement mortar. The cement slurry has a cement:water:cohesive soil ratio of 1:0.5:0.5; Further, S40: After the cement slurry in the bottom support layer 24 of the patching zone 12 hardens, several layers of support layers 24 are filled from the bottom of the patching zone 12 to the top in step S30, with the layers of support layers 24 arranged in a stepped manner from the bottom to the top of the patching zone 12; after the next layer of cement slurry hardens, sandbags are piled up for the adjacent layer above, and so on until the entire patching zone 12 is filled. During the process of filling multiple support layers 24 layer by layer from the bottom to the top of the patching zone 12, the self-pressure dispersion type anchor cable 22 in step S20... The section 221 is pre-embedded in the multi-layer support layer 24. Simultaneously, in step S40, flexible drainage pipes 25 are installed near the top and bottom of the slope surface 11 of the patched support structure 2. These flexible drainage pipes 25 are embedded within several layers of support layer 24, with a minimum extension length of 2m into the main slope surface 1. This ensures that after patching, the uneven heat transfer between the patched support structure 2 and the main slope surface 1 due to their different compositions will prevent excessive condensation. The flexible drainage pipes 25 can promptly drain this moisture, ensuring the strong connection between the patched support structure 2 and the main slope surface 1.

[0011] Preferably, in step S40, after the filling is completed, the final filling of the patching area 12 is to pour cement slurry on the top for hardening, and to harden the top plate in order to fully fill the area. The hardening range extends to the main body of the slope 1 with a length L of not less than 1m. At the same time, after the filling of several layers of support layers 24 is completed, a repair layer 26 is fixed on the outer slope formed by several layers of stacked parts 23, so that while repairing the outer surface of the patching support structure 2, the patching support structure 2 can be further compacted.

[0012] Example 2: In Example 1, since the multi-layered stepped support layer 24 is filled layer by layer, that is, the lower layer of cement slurry hardens before the adjacent upper layer of support layer 24 is filled with sandbags and cement slurry, the solidification time of each layer is different. When the pressure from the slope body 1 to the support layer 24 is large, the multi-layered stepped support layer 24 is prone to relative movement between the layers, which will damage the interlocking support structure 2. Therefore, based on the setting of pressure-dispersing anchor cables 22, further in step S40 Several buffer connectors 3 are arranged in a matrix between two adjacent support layers 24. When the support layer 24 is filled with cement slurry, the buffer connectors 3 tighten the two adjacent support layers 24. Specifically, the buffer connector 3 is an I-shaped ring, including a web strip 31 and end strips 32 at both ends of the web strip 31. The web strip 31 and the end strips 32 are integrally formed and are outwardly convex arc-shaped strips. When the support layer 24 is filled with cement slurry, the shaft connecting the two end strips 32 of the buffer connector 3... The line is parallel to the outward direction of the slope 11, with the axis connecting the two end strips 32 as the dividing line. Half of the buffer connector 3 is buried in the lower support layer 24, and the other half is buried in the upper support layer 24, so that after the support layer 24 is filled with cement slurry, it can connect the two adjacent support layers 24. In this way, when the main body of the slope 1 applies a large pressure to the multi-layer stepped support layer 24, causing the support layer 24 to move outward (or in other words, there is a tendency for relative sliding between the two adjacent support layers 24), the buffer connector 3 can connect the two adjacent support layers. 24. Tighten to prevent relative displacement between the two; furthermore, when the I-shaped ring buffer connector 3 is under pressure, the two opposing arc-shaped web strips 31 can move closer to each other and undergo slight deformation, and the two opposing end strips 32 can also stagger and undergo slight deformation. In this way, under the combined action of the web strips 31 and the end strips 32, the multi-directional pressure (i.e., the pressure applied by the slope body 1 to the patching support structure 2 towards the patching area 12) on the multi-layer stepped support layer 24 as a whole can be further buffered, achieving a good damping effect.

[0013] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. A method for constructing slope patching and support, characterized in that, Includes the following steps: S00: Adjust the irregular slope (11) of the over-excavated part of the main slope (1) so that the slope ratio of the adjusted slope (11) is gentler than 1:0.

2. At the same time, remove the loose soil of part of the slope (11) to form a patching area (12). A patching support structure (2) is set in the patching area (12). S10: A reinforcing bar (21) is provided at the bottom of the patching area (12). The patching support structure (2) first opens a hole (121) at the bottom of the patching area (12) to match the reinforcing bar (21). After grouting into the hole (121), the reinforcing bar is installed. The reinforcing bar (21) extends into the soil along the hole (121). The exposed length of the reinforcing bar (21) and the length extending into the soil are equal. S20: Several pressure-dispersing anchor cables (22) are provided in the slope body (1). The pressure-dispersing anchor cable (22) includes a free section (221) and an anchoring section (222). The anchoring section (222) is embedded in the slope body (1), and the free section (221) is embedded in the patching support structure (2). S30: The patching support structure (2) uses sandbags to pile up at the bottom of the patching area (12) away from the slope (11) to form a piled-up part (23). A support layer (24) is formed between the piled-up part (23) and the slope (11). The support layer (24) is filled with cement slurry, and the piled-up part (23) is filled with fine stone concrete or cement mortar. S40: After the cement slurry in the bottom support layer (24) of the patching area (12) hardens, several layers of support layer (24) are filled and installed layer by layer from the bottom to the top of the patching area (12) according to the method of step S30. The several layers of support layer (24) are in a stepped shape from the bottom to the top of the patching area (12).

2. The slope engineering patching and support construction method according to claim 1, characterized in that: In step S10, the exposed length of the reinforcing bar (21) and the length extending into the soil are not less than 1000 mm.

3. The slope engineering patching and support construction method according to claim 1, characterized in that, In step S20, the angle α between the pressure-dispersing anchor cable (22) and the horizontal plane is 25°, so as to pull the interlocking support structure (2) toward the slope body (1).

4. The slope engineering patching and support construction method according to claim 1, characterized in that, In step S30, the cement:water:cohesive soil ratio in the cement slurry is 1:0.5:0.

5.

5. The slope engineering patching and support construction method according to claim 1, characterized in that, In step S30, the height of the stacked section (23) is no greater than 1m.

6. The slope engineering patching and support construction method according to claim 1, characterized in that, In step S40, flexible drainage pipes (25) are provided at the top and bottom of the interlocking support structure (2) near the slope (11). The flexible drainage pipes (25) are buried in several layers of the support layer (24), and the length of the flexible drainage pipes (25) extending into the main body of the slope (1) is not less than 2m.

7. The slope engineering patching and support construction method according to claim 1, characterized in that, In step S40, after the filling is completed, cement slurry is poured on the top of the patching area (12) to harden it, and the hardening range extends to the main body of the slope (1) for a length L of not less than 1m.

8. The slope engineering patching and support construction method according to claim 1, characterized in that, In step S40, after the several layers of the support layer (24) are filled, a repair layer (26) is fixed on the outer slope surface formed by the several layers of the stacked part (23).

9. The method for slope engineering patching and support construction according to claim 1, characterized in that, In step S40, several buffer connectors (3) are arranged in a matrix between two adjacent support layers (24). When the support layer (24) is filled with cement slurry, the buffer connectors (3) tighten the two adjacent support layers (24).

10. A method for slope engineering patching and support construction according to claim 9, characterized in that, The buffer connector (3) is an I-shaped ring. The buffer connector (3) includes a belly strip (31) and end strips (32) set at both ends of the belly strip (31). The belly strip (31) and the end strips (32) are integrally formed. The belly strip (31) and the end strips (32) are outwardly protruding arc strips. When the support layer (24) is filled with cement slurry, the axis connecting the two end strips (32) of the buffer connector (3) is parallel to the outward direction of the slope (11). The axis connecting the two end strips (32) is used as a dividing line. Half of the buffer connector (3) is buried in the lower support layer (24), and the other half is buried in the upper support layer (24) so ​​as to connect the two adjacent support layers (24) after the support layer (24) is filled with cement slurry.

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