Segmented construction anchor cable for limited filling anchoring retaining wall and construction method

Abstract

The segmented construction anchor cable comprises an in-slope section and a soil filling section, the in-slope section is arranged in an original slope body, the soil filling section is arranged within the soil filling range of the original slope body, and the two sections are connected in a sealed mode through a sealing plate; the soil filling section is provided with a first grouting pipe, the grouting area, in the soil filling section, of the first grouting pipe is a first grouting area, the in-slope section grouting adopts sectional pressurizing grouting, the in-slope section and the soil filling section are further provided with steel strands respectively, and the two sections of steel strands are detachably connected through a connector. The anchor cable is arranged to be the in-slope section and the soil filling section which can be independently constructed, meanwhile, the structure in the anchor cable is arranged in a segmented mode, the process that the in-slope section is constructed firstly and then the soil filling section is constructed is achieved, the anchor cable body of the soil filling section is reserved, the wall body is filled with soil to be constructed on the anchor head, tensioning can be achieved, continuous construction can be achieved, and the construction period is reasonable.

Description

Technical Field

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

[0002] The distance between the wall body of the limited fill retaining wall and the existing slope behind the wall is close. It is the best choice to use the existing stable slope to adopt an anchored lightweight retaining wall. However, the cable anchor construction intersects with the wall body and filling construction. At present, one construction method is to construct a certain height of the wall body and filling, and then construct a row of cable anchors, and so on until the top of the wall. The technology is reasonable, but all other processes are also stopped during the construction of the middle cable anchor and the waiting for tensioning, resulting in a longer total construction period; another construction method is to first construct the cable anchors in the slope body, reserve the cable anchor body in the filling section, and the wall body filling can be tensioned when it is constructed above the anchor head, and continuous construction can be carried out, and the construction period is more reasonable. However, the reserved cable anchor body interferes with the filling construction, and the cable body is often damaged. The grouting body at the joint between the cable anchor filling section and the slope body section is discontinuous or has cracks, and the anti-corrosion requirements of the cable anchor cannot be met. Summary of the Invention

[0003] Aiming at the defect that all other processes are also stopped during the existing cable anchor construction and the waiting for tensioning, resulting in a longer total construction period and unable to carry out continuous construction, the purpose of the invention is to provide a segmented construction cable anchor and a construction method for a limited fill anchored retaining wall.

[0004] To achieve the foregoing purpose, the technical solution adopted by the invention is: a segmented construction cable anchor for a limited fill anchored retaining wall, including an in-slope section and a filling section. The in-slope section is arranged in the original slope body, and the filling section is arranged within the filling range of the original slope body, and the two sections are hermetically connected through a sealing plate; the filling section is provided with a first grouting pipe, and the grouting area of the first grouting pipe in the filling section is the first grouting area. The in-slope section is grouted by sectional pressure grouting, and the in-slope section and the filling section are also respectively provided with steel strands, and the steel strands of the two sections are detachably connected through a connector.

[0005] As an improvement of the above technical solution, the in-slope section sectional grouting pipe 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 grout stop bag.

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

[0007] As an improvement of the above technical solution, the first exhaust pipe extends to the outside of the in-slope section at the junction with the original slope body 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 grout bag is fixedly arranged by an inner clamp and an outer clamp.

[0009] As an improvement of the above technical solution, a guide pipe for guiding the grouting pipe and the steel strand is further arranged in the slope section, and a protective cover and a corrugated pipe for protecting the filled soil section are arranged in the filled soil 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 corrugated pipe.

[0010] And a segmented construction method for a limited filled soil anchored retaining wall, including the above-mentioned segmented construction anchor cable for a limited filled soil anchored retaining wall. The specific process is as follows: S1: Drill a slope section anchor cable hole on the original slope surface; S2: Fabricate a slope section anchor cable body in the anchor cable hole of the slope section; S3: Construct the anchor cable body in the slope; S4: Fill the soil to a height higher than the anchor cable elevation, and open a filling groove on the filled soil section corresponding to the position of the slope section; S5: Fabricate a filled soil section anchor cable and install the filled soil section anchor cable in the filling groove; S6: Stuff mortar and / or fine stone concrete outside the filled soil section anchor cable to fix the filled soil section anchor cable; S7: Backfill the trench to complete the grouting of the filled soil section anchor cable; S8: Continue to fill the soil to a certain height higher than the anchor cable elevation, tension and lock the anchor cable to complete the construction of the anchor cable; S9: Cycle through the above steps at other positions of the slope until the top of the wall.

[0011] As an improvement of the above technical solution, step S2 further includes: S21: Set the steel strand, the second grouting pipe and the third grouting pipe in the slope section cable anchor hole, and the second grouting pipe and the third grouting pipe are not connected; S22: Fix the guide pipe, the grout bag, the second exhaust pipe, the steel strand, the second grouting pipe and the third grouting pipe with an outer clamp and an inner clamp at the hole opening; 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 slope section; S24: Finally, fix the sealing plate on the flange of the guide pipe.

[0012] As an improvement of the above technical solution, step S3 further includes: S31: Connect the slurry delivery pipe to the second grouting pipe, and the slurry enters the grout bag through the second grouting pipe; S32: Block the second exhaust pipe after the grout bag is full, and the slurry enters the third grouting pipe; S33: After the third grouting area is filled, the grout overflows from the first exhaust pipe; S34: Seal the first exhaust pipe to complete the pressure grouting; S35: Install a temporary protective cover.

[0013] As an improvement to the above technical solution, step S5 further includes: S51: Remove the temporary protective cover; S52: Cut the first exhaust pipe and the second grouting pipe to be flush with the sealing plate; S53: Connect the steel strands in the slope section and the fill section through a steel strand connector; S54: Fix and connect the protective cover to the sealing plate and the guide pipe; S55: Connect the corrugated plate to the protective cover.

[0014] The foregoing segmented construction cable anchor and construction method for a limited fill anchored retaining wall can achieve the following beneficial effects: (1) The cable anchor is set into a slope section and a fill section that can be constructed separately. At the same time, the structure inside the cable anchor is also segmented. This realizes the process of first constructing the slope section and then the fill section. The fill section cable anchor body is reserved, and the wall fill can be tensioned after the construction reaches above the anchor head, enabling continuous construction with a relatively reasonable construction period; (2) The cable anchor is grouted in segments as a whole, and the grouting structure inside the cable anchor is also divided into two segments by the multi-segment pressure grouting method. This can ensure the continuity of grouting in the relatively long and thin slope section, and can increase the pressure during grouting, reducing the occurrence of cracks and faults during the grouting process; (3) The detachable steel strands are arranged such that the fill section is not set during the construction of the slope section, so that the construction of the slope section is not affected by the steel strands in the fill section and will not cause damage to the steel strands in the fill section, ensuring the integrity of the overall steel strands. Moreover, during demolition, it can be disassembled in segments, making the construction process convenient and fast.

[0015] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features, and advantages of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the accompanying drawings, is described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural schematic diagram of a limited fill anchored retaining wall of the present invention.

[0017] Figure 2 is a structural schematic diagram of the slope section of the present invention.

[0018] Figure 3 is a structural schematic diagram of the fill section of the present invention.

[0019] Wherein: 1. In-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. Grout 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 implementation manners

[0020] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, 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 may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention. In the drawings and the following description, at least some of the well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention; and, for clarity, the dimensions 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 only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0021] The directional terms appearing in the following description are all 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 defined and limited, the terms "set", "installed", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may 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 specific situations.

[0022] Referring to Figure 1 , a segmented construction method for a limited backfill anchored retaining wall, different from the integral construction method of constructing a wall of a certain height and backfill at one time, and then constructing a row of anchor cables, and so on until the top of the wall. This application is provided with segmented construction anchor cables for a limited backfill anchored retaining wall. The specific steps are as follows: Step 1: First, divide the construction section of the anchor-pulled retaining wall into the in-slope section 1 and the filling section 2. The in-slope section 1 is arranged in the original slope body, and the filling section 2 is arranged within the filling range of the original slope body. During construction, the in-slope section 1 anchor cable holes can be drilled on the original slope surface first, and then the anchor cables in the slope body can be constructed in a segmented construction method. Reserve the anchor cable body of the filling section 2. After the wall filling construction reaches above the anchor head, tensioning can be carried out, enabling continuous construction with a relatively reasonable construction period.

[0023] Step 2: After the in-slope section 1 anchor cable holes are drilled on the original slope surface, refer to Figure 2 , make the in-slope section 1 anchor cable body in the anchor cable holes of the in-slope section 1. After making the in-slope section 1 anchor cable body, the grouting structure in the anchor cable body is also divided into two sections by the segmented pressure grouting method of the in-slope section 1, which can ensure the continuity of grouting in the long and thin in-slope section 1, and can increase the pressure during grouting, reducing the generation of cracks and faults during the grouting process. The in-slope section 1 anchor cable body mainly includes the in-slope section 1 grouting pipe. The in-slope section 1 segmented grouting pipe 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 grout stop bag 17, and the second grouting pipe 12 and the third grouting pipe 14 are not connected.

[0024] The in-slope section 1 is also provided with a guide pipe 18 for guiding the grouting pipe and the steel strand 6. After setting the steel strand 6 and the grouting pipe, use an external clamp and an internal clamp to fix the guide pipe 18, the grout stop bag 17, the second exhaust pipe 16, the steel strand 6, the second grouting pipe 12, and the third grouting pipe 14 at the hole mouth. When fixing, in order to ensure the sealing and stability of the grout stop bag 17, internal clamps and external clamps are respectively arranged on the grout stop bag 17, and the two clamps are clamped simultaneously, ensuring that the grout stop 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 pass through the in-slope section 1 from the corresponding positions of the in-slope section 1 anchor cable hole, and use a sealing plate 3 to fix the guide pipe 18, the second exhaust pipe 16, and the steel strand 6 extending out of the in-slope section 1 anchor cable hole at the hole mouth.

[0025] In addition, the first exhaust pipe 15 and the second exhaust pipe 16 are respectively arranged at the grouting positions of the second grouting pipe 12 and the third grouting pipe 14. The first exhaust pipe 15 and the second exhaust pipe 16 are respectively used as exhaust holes during grouting in the second grouting area 11 and the third grouting area 13. The first exhaust pipe 15 extends to the outside of the in-slope section 1 at the junction with the original slope body in the second grouting area 11, and the second exhaust pipe 16 extends to the first grouting area 21 in the third grouting area 13.

[0026] Step 3: After the production of the internal slope cable body structure is completed, start the construction grouting for the internal slope section 1. During grouting, connect the grout delivery pipe to the second grouting pipe 12, and the grout enters the grout stop bag 17 arranged on the outer periphery of the second grouting pipe 12. After the grout stop bag 17 is filled, the grout will flow out to the side outside the internal slope section 1 along a section of the first exhaust hole located in the second grouting area 11. At this time, the first exhaust pipe 15 can be blocked on the unconstructed outside. After the second grouting area 11 is filled, the grout flows into one end of the third grouting area 13 located in the second grouting area 11 along one end of the third grouting pipe 14 located in the second grouting area 11, thereby filling the third grouting area 13 with grout. When the third grouting area 13 is filled with grout, grout will flow out from one end of the second exhaust pipe 16 located in the first grouting area 21. At this time, the second exhaust pipe 16 can be blocked. Thus, the process of pressure grouting is completed.

[0027] After the grouting of the internal slope section 1 is completed, fix the sealing plate 3 on the flange 4 of the guide pipe 18, and install a protective cover 23 on the flange 4 at the orifice position of the internal slope section 1 to protect the guide pipe 18, the second exhaust pipe 16 and the steel strand 6 extending from the internal slope section 1.

[0028] Step 4: Fill the soil to a height higher than the elevation of the cable anchor, and open a soil filling groove on the soil filling section 2 corresponding to the position of the internal slope section 1 to expose the position of the cable anchor for subsequent operations.

[0029] Step 5: Refer to Figure 3 , produce the cable anchor for the soil filling section 2, and install the cable anchor for the soil filling section 2 in the soil filling groove. The soil filling section 2 is arranged within the scope of the original slope soil filling. The specific structure during the production of the cable anchor for the soil filling section 2 includes a first grouting pipe 22, and the grouting area of the first grouting pipe 22 in the soil filling section 2 is the first grouting area 21. Since the first grouting pipe 22, the second grouting pipe 12 and the third grouting pipe 14 are arranged in sections, it does not affect the sectional construction of the internal slope section 1 and the soil filling section 2. The soil filling section 2 is also provided with a steel strand 6, and the steel strand 6 of the soil filling section 2 and the steel strand 6 of the internal slope section 1 are detachably connected through a connector 7. This detachable connection of the two sections of steel strand 6 avoids the bundled construction of the internal slope section 1 and the soil filling section 2. It realizes the process of first constructing the internal slope section 1 and then constructing the soil filling section 2. The cable anchor body of the soil filling section 2 is reserved, and the wall soil filling construction can be tensioned after reaching above the anchor head, and continuous construction can be carried out, and the construction period is relatively reasonable. The detachably arranged steel strand 6 does not set the soil filling section 2 during the construction of the internal slope section 1, so that the construction of the internal slope section 1 is not affected by the steel strand 6 of the soil filling section 2, and the steel strand 6 of the soil filling section 2 will not be accidentally damaged, ensuring the integrity of the overall steel strand 6, and during demolition, it can be disassembled section by section, and the construction process is convenient and fast.

[0030] In addition, a protective cover 23 and a corrugated pipe 24 for protecting the backfill section 2 are provided on the backfill section 2. One end of the protective cover 23 is connected to the sealing plate 3 on the guide pipe 18, and the other end is connected to the corrugated pipe 24. And the two sections are hermetically connected through the sealing plate 3; When constructing the anchor cable of the backfill section 2, first remove the temporary protective cover 5 of the slope inner 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 up the first grouting pipe 22. Then connect the steel strand 6 of the slope inner section 1 and the steel strand 6 of the backfill section 2 through the steel strand 6 connector 7. Finally, set up the protective cover 23 of the backfill section 2. One end of the protective cover 23 is the same as that of the temporary protective cover 5, and is fixed on the steel plate through the flange 4 and is guided and fixed with the sealing plate 3 and the guide pipe 18. The other end range of the protective cover 23 becomes smaller 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 backfill section 2 to fix the anchor cable of the backfill section 2. Then, after backfilling the trench, connect the slurry delivery pipe to the first grouting pipe 22 and grout the backfill section 2 through the first grouting pipe 22.

[0031] Step 6: Continue backfilling to a certain height above the elevation of the anchor cable, tension and lock the anchor cable to complete the construction of the anchor cable; Step 7: Cycle through the above steps at other positions of the slope until the top of the wall.

[0032] The above are only the preferred embodiments of the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A segmented construction cable anchor for a limited fill anchored retaining wall, characterized in that: It includes an in-slope section and a backfill section. The in-slope section is arranged within the original slope body, and the backfill section is arranged within the scope of the original slope backfill. The two sections are hermetically connected through a sealing plate. The backfill section is provided with a first grouting pipe. The grouting area of the first grouting pipe in the backfill section is the first grouting zone. The in-slope section is grouted by sectional pressure grouting. The in-slope section and the backfill section are also respectively provided with steel strands, and the steel strands of the two sections are detachably connected through a connector.

2. The segmented construction cable anchor for a limited fill anchored retaining wall according to claim 1, characterized in that: The in-slope sectional grouting pipe 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 zone and a third grouting zone by a grout stop bag.

3. The segmented construction cable anchor for a limited fill anchored retaining wall according to claim 2, characterized in that: The grouting positions of the first grouting pipe and the second grouting pipe are also respectively provided with a first exhaust pipe and a second exhaust pipe. The first exhaust pipe and the second exhaust pipe are respectively used as exhaust holes during the grouting of the second grouting zone and the third grouting zone.

4. A segmented construction anchor cable for a limited fill anchored retaining wall according to claim 3, characterized in that: The first exhaust pipe extends to the outside of the in-slope section at the junction with the original slope body in the second grouting zone; the second exhaust pipe extends to the first grouting zone in the third grouting zone.

5. The segmented construction cable anchor for a limited fill anchored retaining wall according to claim 2, wherein: The grout stop bag is fixedly arranged through an inner clamp and an outer clamp.

6. A segmented construction cable anchor for a limited fill anchored retaining wall according to claim 1, characterized in that: The in-slope section is also provided with a guiding pipe for guiding the grouting pipe and the steel strand. The backfill section is provided with a protective cover and a corrugated pipe for protecting the backfill section. One end of the protective cover is connected to the sealing plate on the guiding pipe, and the other end is connected to the corrugated pipe.

7. A segmented construction method for a limited fill anchored retaining wall, characterized in that: A sectional construction cable anchor for a limited backfill anchored retaining wall including claims 1-6, the specific process is as follows: S1: Drill an in-slope cable anchor hole on the original slope surface; S2: Fabricate an in-slope cable anchor body in the cable anchor hole of the in-slope section; S3: Construct the in-slope cable anchor body; S4: Backfill to a height higher than the cable anchor elevation, and open a backfill groove on the backfill section corresponding to the position of the in-slope section; S5: Fabricate a backfill section cable anchor and install the backfill section cable anchor in the backfill groove; S6: Stuff mortar and / or fine aggregate concrete outside the backfill section cable anchor to fix the backfill section cable anchor; S7: Backfill the trench and complete the grouting of the backfill section cable anchor; S8: Continue to backfill to a height higher than the cable anchor elevation, tension and lock the cable anchor, and complete the cable anchor construction; S9: Cycle through construction steps S1 to S8 at other positions of the slope until the wall top.

8. A sectional construction method for a limited fill anchored retaining wall according to claim 7, characterized in that: S2 also includes: S21: Set steel strands, a second grouting pipe and a third grouting pipe in the in-slope cable anchor hole, and the second grouting pipe and the third grouting pipe are not connected; S22: Fix the guiding pipe, the grout stop bag, the second exhaust pipe, the steel strands, the second grouting pipe and the third grouting pipe with an outer clamp and an inner clamp at the hole mouth; S23: Pass the steel strands, the second exhaust pipe and the second grouting pipe through the corresponding positions on the sealing plate and out of the in-slope section; S24: Finally, fix the sealing plate on the flange of the guiding pipe.

9. A segmented construction method for a limited fill anchored retaining wall according to claim 7, characterized in that: S3 also includes: S31: Connect the slurry delivery pipe to the second grouting pipe, and the slurry enters the grout stop bag through the second grouting pipe; S32: After the grout stop bag is filled, block the second exhaust pipe, and the slurry enters the third grouting pipe; S33: After the third grouting zone is filled, the slurry overflows from the first exhaust pipe; S34: Block the first exhaust pipe to complete the pressure grouting; S35: Install a temporary protective cover.

10. A sectional construction method for a limited fill anchored retaining wall according to claim 7, characterized in that: S5 also includes: S51: Remove the temporary protective cover; S52: Cut the first exhaust pipe and the second grouting pipe flush with the sealing plate; S53: Connect the steel strands in the slope section and the steel strands in the backfill section through a steel strand connector; S54: Fix and connect the protective cover to the sealing plate and the guide pipe; S55: Connect the corrugated plate to the protective cover.

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