A segmented construction anchor cable and construction method for a limited fill anchor retaining wall

Abstract

The present invention discloses a segmented construction anchor cable and construction method for a limited fill anchor retaining wall, comprising an in-slope section and a fill section, wherein the in-slope section is arranged within the original slope body, and the fill section is arranged within the range of the original slope body fill, and the two sections are sealed and connected by a sealing plate; the fill section is provided with a first grouting pipe, and the grouting area of ​​the first grouting pipe in the fill section is a first grouting area, and the grouting of the in-slope section adopts segmented pressure grouting, and the in-slope section and the fill section are also provided with steel strands, and the two sections of steel strands are detachably connected by a connector. The anchor cable is arranged into an in-slope section and a fill section that can be constructed separately, and the structure of the anchor cable is arranged in segments, so that the in-slope section is constructed first and then the fill section is constructed. The anchor cable body is reserved in the fill section, and the wall fill construction can be tensioned when it is above the anchor head, so that continuous construction is possible and the construction period is relatively reasonable.

Description

Technical Field

[0001] The invention belongs to the technical field of geotechnical engineering retaining wall construction, and particularly relates to a segmented construction anchor cable and a construction method for a limited fill anchor retaining wall. Background Art

[0002] The limited fill retaining wall is close to the existing slope behind the wall. The best option is to use the existing stable slope to adopt an anchor-type lightweight retaining wall. However, the construction of anchor cables overlaps with the construction of walls and fill. One of the current construction methods is to construct a certain height of wall and fill, and then construct a row of anchor cables. This cycle continues until the top of the wall. This is technically sound, but all other processes are stopped during the construction of the intermediate anchor cables and the waiting period for tensioning, resulting in a long total construction period. Another construction method is to first construct the anchor cables in the slope, and reserve the anchor cable body in the fill section. The wall fill can be tensioned when it is constructed above the anchor head. This method allows for continuous construction and a more reasonable construction period. However, the reserved anchor cable body and fill construction interfere with each other, and the cable body is often damaged. The grouting at the junction of the anchor cable fill section and the slope section is discontinuous or cracked, which fails to meet the anchor cable anti-corrosion requirements. Summary of the Invention

[0003] Aiming at the defects of existing anchor cable construction and other processes being all stopped during waiting for tensioning, resulting in a long total construction period and inability to carry out continuous construction, the purpose of the present invention is to propose a segmented construction anchor cable and construction method for limited fill anchor retaining wall.

[0004] In order to achieve the aforementioned objectives, the technical solution adopted by the present invention is: a segmented construction anchor cable for a limited fill anchor retaining wall, comprising an in-slope section and a fill section, wherein the in-slope section is arranged in the original slope body, and the fill section is arranged within the range of the original slope body fill, and the two sections are sealed and connected by a sealing plate; the fill section is provided with a first grouting pipe, and the grouting area of ​​the first grouting pipe in the fill section is the first grouting area, the grouting of the in-slope section adopts segmented pressurized grouting, and the in-slope section and the fill section are also respectively provided with steel strands, and the two sections of steel strands are detachably connected through a connector.

[0005] As an improvement of the above technical solution, the segmented grouting pipe in the slope includes a second grouting pipe and a third grouting pipe, and the grouting positions of the second grouting pipe and the third grouting pipe are divided into a second grouting area and a third grouting area by a grouting bag.

[0006] As an improvement of the above technical solution, the grouting positions of the first grouting pipe and the second grouting pipe are further provided with a first exhaust pipe and a second exhaust pipe, respectively. The first exhaust pipe and the second exhaust pipe are used as exhaust holes during grouting in the second grouting area and the third grouting area, respectively.

[0007] As an improvement of the above technical solution, the first exhaust pipe extends to the outside of the inner section of the slope at the junction with the original slope in the second grouting area; the second exhaust pipe extends to the first grouting area in the third grouting area.

[0008] As an improvement of the above technical solution, the slurry-stopping bag is fixed by an inner clamp and an outer clamp.

[0009] As an improvement of the above technical solution, the slope section is also provided with a guide pipe for guiding the grouting pipe and the steel strand, and the fill section is provided with a protective cover and a bellows for protecting the fill section. One end of the protective cover is connected to the sealing plate on the guide pipe, and the other end is connected to the bellows.

[0010] And a segmented construction method for a limited fill anchor retaining wall, including the segmented construction anchor cable for a limited fill anchor retaining wall, the specific process is as follows:

[0011] S1: Drill anchor holes in the inner section of the slope on the original slope surface;

[0012] S2: making the anchor cable body of the inner slope section in the anchor cable hole of the inner slope section;

[0013] S3: Construction of anchor cable bodies within the slope;

[0014] S4: Fill the soil to a level higher than the anchor cable elevation, and open a soil filling trough on the soil filling section corresponding to the position of the inner slope section;

[0015] S5: making anchor cables for the fill section and installing them in the fill trough;

[0016] S6: Fill the anchor cables in the fill section with mortar and / or fine stone concrete to fix the anchor cables in the fill section;

[0017] S7: Backfill the trench and complete the anchor grouting of the fill section;

[0018] S8: Continue filling the soil to a certain height above the anchor cable elevation, tension and lock the anchor cable, and complete the anchor cable construction;

[0019] S9: Repeat the above steps at other locations on the slope until the top of the wall.

[0020] As an improvement to the above technical solution, step S2 further includes:

[0021] S21: installing a steel strand, a second grouting pipe, and a third grouting pipe in the cable anchor hole in the inner slope section, with the second grouting pipe and the third grouting pipe not being connected;

[0022] S22: Use outer clamps and inner clamps to fix the guide pipe, grouting bag, second exhaust pipe, steel strand, second grouting pipe, and third grouting pipe at the orifice;

[0023] S23: Pass the steel strand, the second exhaust pipe, and the second grouting pipe through the corresponding positions on the sealing plate and out of the inner section of the slope;

[0024] S24: Finally, fix the sealing plate to the flange of the guide pipe.

[0025] As an improvement to the above technical solution, step S3 further includes:

[0026] S31: Connect the slurry delivery pipe to the second grouting pipe, and the slurry enters the slurry stop bag through the second grouting pipe;

[0027] S32: After the slurry bag is full, the second exhaust pipe is blocked and the slurry enters the third grouting pipe;

[0028] S33: After the third grouting area is filled, the slurry overflows from the first exhaust pipe;

[0029] S34: blocking the first exhaust pipe and completing the pressure grouting;

[0030] S35: Install temporary protective cover.

[0031] As an improvement to the above technical solution, step S5 further includes:

[0032] S51: Remove the temporary protective cover;

[0033] S52: cutting the first exhaust pipe and the second grouting pipe until they are flush with the sealing plate;

[0034] S53: Connect the steel strands in the slope section and the steel strands in the fill section through a steel strand connector;

[0035] S54: The protective cover is fixedly connected to the sealing plate and the guide tube;

[0036] S55: Connect the corrugated plate to the protective cover.

[0037] The aforementioned segmented anchor cable and construction method for a limited fill anchor retaining wall can achieve the following beneficial effects:

[0038] (1) The anchor cable is set up into the slope section and the fill section, which can be constructed separately. At the same time, the structure inside the anchor cable is set up in sections, which realizes the process of constructing the fill section after the slope section is completed. The anchor cable body of the fill section is reserved, and the wall fill construction can be tensioned when it is above the anchor head. The construction can be continuous and the construction period is more reasonable.

[0039] (2) Grouting the entire anchor cable in sections. The multi-section pressure grouting method divides the grouting structure inside the anchor cable into two sections. This can ensure the continuity of grouting in the longer and thinner slope section, increase the pressure during grouting, and reduce the generation of cracks and faults during the grouting process.

[0040] (3) The detachable steel strands are set up in the backfill section during the construction of the slope section, so that the construction of the slope section is not affected by the backfill section steel strands and will not cause accidental damage to the backfill section steel strands, thus ensuring the overall integrity of the steel strands. When dismantling, they can be dismantled in sections, making the construction process convenient and quick.

[0041] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The present invention is a structural schematic diagram of a limited fill anchor retaining wall.

[0043] Figure 2 It is a schematic structural diagram of the slope inner section of the present invention.

[0044] Figure 3 It is a schematic structural diagram of the fill section of the present invention.

[0045] in:

[0046] 1. Inner slope section; 11. Second grouting area; 12. Second grouting pipe; 13. Third grouting area; 14. Third grouting pipe; 15. First exhaust pipe; 16. Second exhaust pipe; 17. Grouting stop bag; 18. Guide pipe; 2. Backfill section; 21. First grouting area; 22. First grouting pipe; 23. Protective cover; 24. Bellows; 3. Sealing plate; 4. Flange; 5. Temporary protective cover; 6. Steel strand; 7. Connector. DETAILED DESCRIPTION

[0047] The features and exemplary embodiments of various aspects of the present invention are described in detail below. In the detailed description that follows, many specific details are set forth in order to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be implemented without some of these specific details. The following description of the embodiments is intended only to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some of the well-known structures and technologies are not shown in order to avoid unnecessary ambiguity in the present invention; and, for the sake of clarity, the sizes of some structures may be exaggerated. The features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments. In addition, the terms "first or I", "second or II", "third or III", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0048] The directional words appearing in the following description refer to the directions shown in the drawings and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0049] Reference Figure 1 A segmented construction method for a limited fill anchor retaining wall is different from the overall construction method of constructing a certain height of the wall and fill at one time, then constructing a row of anchor cables, and repeating the construction until the top of the wall. This application provides a segmented construction anchor cable for a limited fill anchor retaining wall. The specific steps are as follows:

[0050] Step 1: First, the construction section of the anchor retaining wall is divided into an in-slope section 1 and a fill section 2. The in-slope section 1 is located within the original slope, while the fill section 2 is located within the existing slope fill. During construction, anchor holes for the in-slope section 1 can be drilled on the original slope surface. Then, using a segmented construction method, the anchor cables are first installed within the slope, leaving the anchor cable body for the fill section 2 in reserve. Once the wall fill reaches the anchor head, tensioning can begin. This allows for continuous construction and a more reasonable construction period.

[0051] Step 2: After drilling the anchor hole in the inner section 1 on the original slope surface, refer to Figure 2 The anchor cable body of the inner slope section 1 is made in the anchor cable hole of the inner slope section 1. After the anchor cable body of the inner slope section 1 is made, the grouting structure in the anchor cable body is also divided into two sections by the segmented pressure grouting method of the inner slope section 1. This can ensure the continuity of grouting in the longer and thinner inner slope section 1, and can increase the pressure during grouting, reducing the generation of cracks and faults during the grouting process. The anchor cable body of the inner slope section 1 mainly includes the grouting pipe of the inner slope section 1. The segmented grouting pipe of the inner slope section 1 includes the second grouting pipe 12 and the third grouting pipe 14. The grouting positions of the second grouting pipe 12 and the third grouting pipe 14 are divided into the second grouting area 11 and the third grouting area 13 by the grouting bag 17. The second grouting pipe 12 and the third grouting pipe 14 are not connected.

[0052] The inner slope section 1 is also provided with a guide tube 18 for guiding the grouting pipe and the steel strand 6. After the steel strand 6 and the grouting pipe are set, the guide tube 18, the stop grouting bag 17, the second exhaust pipe 16, the steel strand 6, the second grouting pipe 12, and the third grouting pipe 14 are fixed at the orifice with an outer clamp and an inner clamp. During the fixing, in order to ensure the sealing and stability of the stop grouting bag 17, an inner clamp and an outer clamp are also provided on the stop grouting bag 17. The two clamps are clamped together at the same time, ensuring that the stop grouting bag 17 will not fall off or cause slurry overflow after being filled with slurry. Finally, the steel strand 6, the second exhaust pipe 16, and the second grouting pipe 12 are passed through the inner slope section 1 at the corresponding position of the anchor hole in the inner slope section 1, and the guide tube 18, the second exhaust pipe 16, and the steel strand 6 extending out of the anchor hole in the inner slope section 1 are fixed at the orifice with a sealing plate 3.

[0053] In addition, the grouting positions of the second grouting pipe 12 and the third grouting pipe 14 are respectively provided with a first exhaust pipe 15 and a second exhaust pipe 16. The first exhaust pipe 15 and the second exhaust pipe 16 are used as exhaust holes during grouting in the second grouting area 11 and the third grouting area 13. The first exhaust pipe 15 extends from the intersection of the second grouting area 11 and the original slope to the outside of the inner slope section 1, and the second exhaust pipe 16 extends from the third grouting area 13 to the first grouting area 21.

[0054] Step 3: After the anchor cable structure in the slope is completed, grouting of the slope section 1 begins. During grouting, the grouting pipe is connected to the second grouting pipe 12, and the slurry flows along the second grouting pipe 12 into the stop grouting bag 17 arranged on the outer periphery of the second grouting pipe 12. When the stop grouting bag 17 is full, the slurry will flow out along a section of the first vent located in the second grouting area 11 to the side outside the slope section 1. At this time, the first vent pipe 15 can be blocked on the outside where no construction has been done. After the second grouting area 11 is filled, the slurry flows along one end of the third grouting pipe 14 located in the second grouting area 11 into one end of the third grouting area 13, thereby filling the third grouting area 13 with slurry. When the third grouting area 13 is filled with slurry, slurry will flow out from one end of the second grouting pipe 16 located in the first grouting area 21. At this time, the second vent pipe 16 can be blocked, and the process of pressurized grouting is completed.

[0055] After grouting of the inner slope section 1 is completed, the sealing plate 3 is fixed on the flange 4 of the guide pipe 18, and a protective cover 23 is installed on the flange 4 at the orifice position of the inner slope section 1 to protect the guide pipe 18, the second exhaust pipe 16 and the steel strand 6 extending from the inner slope section 1.

[0056] Step 4: Fill the soil to a level higher than the anchor cable elevation, and open a fill groove on the fill section 2 corresponding to the position of the slope section 1 to expose the anchor cable position for subsequent operations.

[0057] Step 5: Reference Figure 3, make the anchor cable of fill section 2, and install the anchor cable of fill section 2 in the fill trough. The fill section 2 is set within the range of the original slope fill. The specific structure of the anchor cable of fill section 2 during production includes a first grouting pipe 22. The grouting area of ​​the first grouting pipe 22 in the fill section 2 is the first grouting area 21. Since the first grouting pipe 22 and the second grouting pipe 12 and the third grouting pipe 14 are set in sections, the segmented construction of the slope section 1 and the fill section 2 is not affected. The fill section 2 is also provided with a steel strand 6, and the steel strand 6 of the fill section 2 and the steel strand 6 of the slope section 1 are detachably connected through a connector 7. This detachably connected two sections of steel strand 6 avoid the bundling construction of the slope section 1 and the fill section 2. The process of constructing the fill section 2 after the slope section 1 is completed is realized. The anchor cable body of the fill section 2 is reserved, and the wall fill construction can be tensioned above the anchor head. The construction can be continuous and the construction period is relatively reasonable. The detachable steel strand 6 is provided when the fill section 2 is not provided during the construction of the inner slope section 1, so that the construction of the inner slope section 1 is not affected by the steel strand 6 of the fill section 2, and no accidental damage is caused to the steel strand 6 of the fill section 2, thereby ensuring the overall integrity of the steel strand 6. Moreover, when dismantling, it can be dismantled in sections, and the construction process is convenient and quick.

[0058] In addition, the fill section 2 is provided with a protective cover 23 and a bellows 24 to protect the fill section 2. One end of the protective cover 23 is connected to the sealing plate 3 on the guide tube 18, and the other end is connected to the bellows 24. The two sections are sealed by the sealing plate 3.

[0059] When constructing the anchor cable of the fill section 2, first remove the temporary protective cover 5 of the inner slope section 1, then cut the first exhaust pipe 15 and the second grouting pipe 12 to be flush with the sealing plate 3 and set the first grouting pipe 22, and then connect the steel strand 6 of the inner slope section 1 and the steel strand 6 of the fill section 2 through the steel strand 6 connector 7. Finally, set the protective cover 23 of the fill section 2. One end of the protective cover 23 is the same as the temporary protective cover 5. It is fixed to the steel plate through the flange 4 and guided and fixed to the sealing plate 3 and the guide pipe 18. The other end of the protective cover 23 is reduced in size so that it can be connected to the corrugated plate. After the connection is completed, mortar and / or fine stone concrete can be filled outside the anchor cable of the fill section 2 to fix the anchor cable of the fill section 2. Then, after backfilling the trench, the grouting pipe is connected to the first grouting pipe 22, and the fill section 2 is grouted through the first grouting pipe 22.

[0060] Step 6: Continue filling the soil to a certain height above the anchor cable elevation, tension and lock the anchor cable to complete the anchor cable construction;

[0061] Step 7: Repeat the above steps at other locations on the slope until the top of the wall.

[0062] The above is only a preferred embodiment of the present invention. Any simple modification, equivalent change and modification made to the above embodiment by any technician familiar with this profession based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A segmented construction method for a limited fill anchor retaining wall, characterized by: The specific process is: S1: Drill anchor holes in the inner section of the slope on the original slope surface; S2: making the anchor cable body of the inner slope section in the anchor cable hole of the inner slope section; S3: Construction of anchor cable body in the inner section of the slope; S4: Fill the soil to a level higher than the anchor cable elevation, and open a soil filling trough on the soil filling section corresponding to the position of the inner slope section; S5: making anchor cables for the fill section and installing them in the fill trough; S6: Fill the anchor cables in the fill section with mortar and / or fine stone concrete to fix the anchor cables in the fill section; S7: Backfill the trench and complete the anchor grouting of the fill section; S8: Continue filling the soil to a height higher than the anchor cable elevation, tension and lock the anchor cable, and complete the anchor cable construction; S9: Repeat construction steps S1 to S8 at other locations on the slope until the top of the wall; The segmented construction anchor cable for the limited fill anchor retaining wall in the above method includes an in-slope section and a fill section, wherein the in-slope section is arranged in the original slope body, and the fill section is arranged within the range of the original slope body fill, and the two sections are sealed and connected by a sealing plate; the fill section is provided with a first grouting pipe, and the grouting area of ​​the first grouting pipe in the fill section is the first grouting area, and the grouting of the in-slope section adopts segmented pressurized grouting, and the in-slope section and the fill section are also respectively provided with steel strands, and the two sections of steel strands are detachably connected by a connector.

2. The segmented construction method for a limited fill anchor retaining wall according to claim 1, characterized in that: The segmented grouting pipes in the inner slope section include a second grouting pipe and a third grouting pipe, and the grouting positions of the second grouting pipe and the third grouting pipe are divided into a second grouting area and a third grouting area by a grouting bag.

3. The segmented construction method for a limited fill anchor retaining wall according to claim 2, characterized in that: The grouting positions of the first grouting pipe and the second grouting pipe are further provided with a first exhaust pipe and a second exhaust pipe, respectively. The first exhaust pipe and the second exhaust pipe are used for exhausting gas during grouting in the second grouting area and the third grouting area, respectively.

4. The segmented construction method for a limited fill anchor retaining wall according to claim 3, characterized in that: The first exhaust pipe extends to the outside of the inner section of the slope at the junction of the second grouting area and the original slope body; the second exhaust pipe extends to the first grouting area in the third grouting area.

5. The segmented construction method for a limited fill anchor retaining wall according to claim 2, characterized in that: The slurry-stopping bag is fixed by an inner clamp and an outer clamp.

6. The segmented construction method for a limited fill anchor retaining wall according to claim 4, characterized in that: The slope section is also provided with a guide pipe for guiding the grouting pipe and the steel strand, and the fill section is provided with a protective cover and a bellows for protecting the fill section. One end of the protective cover is connected to the sealing plate on the guide pipe, and the other end is connected to the bellows.

7. The segmented construction method for a limited fill anchor retaining wall according to claim 6, characterized in that: Said S2 further comprises: S21: Install the steel strand, the second grouting pipe, and the third grouting pipe in the anchor cable hole in the inner slope section, with the second grouting pipe and the third grouting pipe not connected; S22: Use outer clamps and inner clamps to fix the guide pipe, grouting bag, second exhaust pipe, steel strand, second grouting pipe, and third grouting pipe at the orifice; S23: Pass the steel strand, the second exhaust pipe, and the second grouting pipe through the corresponding positions on the sealing plate and out of the inner section of the slope; S24: Finally, fix the sealing plate to the flange of the guide pipe.

8. The segmented construction method for a limited fill anchor retaining wall according to claim 7, characterized in that: Said S3 further comprises: S31: Connect the slurry delivery pipe to the second grouting pipe, and the slurry enters the slurry stop bag through the second grouting pipe; S32: After the slurry bag is full, the second exhaust pipe is blocked and the slurry enters the third grouting pipe; S33: After the third grouting area is filled, the slurry overflows from the first exhaust pipe; S34: blocking the first exhaust pipe and completing the pressure grouting; S35: Install temporary protective cover.

9. The segmented construction method for a limited fill anchor retaining wall according to claim 8, characterized in that: The S5 further includes: S51: Remove the temporary protective cover; S52: cutting the first exhaust pipe and the second grouting pipe until they are flush with the sealing plate; S53: Connect the steel strands in the slope section and the steel strands in the fill section through a steel strand connector; S54: The protective cover is fixedly connected to the sealing plate and the guide tube; S55: Connect the corrugated plate to the protective cover.

Images