Steep slope embankment retaining structure and steep slope road structure

Abstract

The utility model discloses an abrupt slope embankment retaining structure and an abrupt slope road structure, which belong to the technical field of road engineering, and comprise a plurality of pile foundations arranged at intervals, a bearing platform and a vertical wall extending longitudinally are correspondingly arranged, and an anchoring block fixed by a pre-stressed anchor cable is arranged aiming at the vertical wall. And the straining beam is arranged between the anchoring block and the vertical wall, and the structural toughness of the vertical wall can be effectively improved through the combined arrangement of the straining beam and the anchoring block. The steep slope embankment supporting and retaining structure is simple in structure and convenient to construct, the supporting and retaining capacity and structural toughness of the steep slope embankment supporting and retaining structure can be effectively improved, the structural stability and reliability of construction operation of the steep slope embankment supporting and retaining structure and a steep slope road structure are guaranteed, and the steep slope embankment supporting and retaining structure has excellent practical value and application prospects.

Description

Technical Field

[0001] The utility model belongs to the technical field of road engineering, and in particular relates to a steep slope embankment retaining structure and a steep slope road structure. Background Art

[0002] With the continuous improvement of my country's infrastructure, the demand for road construction in mountainous areas and steep slopes is increasing. To ensure the safety of road construction and operation, as well as the structural stability of road projects under disasters such as earthquakes and landslides, higher requirements are placed on the construction of steep slope roads.

[0003] In the design of steep slope road projects, the setting of steep slope embankments is essential. In conventional steep slope embankment structures, retaining wall support structures are often combined with prestressed anchor cables, anti-slip piles and other structures to varying degrees, which can improve the overall stability of the support structure to a certain extent.

[0004] However, in the existing steep slope embankment design process, insufficient consideration is given to the toughness of the structure. Once the slope is too steep or the embankment and roadbed fill height is too high, the stability of the retaining structure will be put to a greater test, which will have an adverse impact on the safe operation of the steep slope road. Utility Model Content

[0005] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the utility model provides a steep slope embankment support structure and a steep slope road structure, which can effectively improve the resilience of steep slope embankment projects and ensure the safety and structural stability of steep slope road setting and operation.

[0006] To achieve the above-mentioned object, one aspect of the present invention provides a steep slope embankment retaining structure, which includes a plurality of pile foundations arranged at intervals along the longitudinal direction of the steep slope road;

[0007] One end of the pile foundation extends into the ground, and the other end extends to the slope surface of the steep slope; and a cap is provided on the top of each pile foundation, and a vertical wall is provided on the cap extending longitudinally along the steep slope road;

[0008] The top of the vertical wall extends to the top of the road structure layer, and a tension beam and an anchor block are embedded on the side of the vertical wall away from the bottom of the slope; the tension beam is arranged in a plurality of intervals in the longitudinal direction of the steep slope road, one end of which is fixedly connected to the vertical wall and the other end is fixed to the corresponding anchor block; and

[0009] A prestressed anchor cable is also provided corresponding to the anchor block. One end of the prestressed anchor cable is anchored in the stratum, and the other end is tensioned and fixed on the corresponding anchor block.

[0010] As a further improvement of the present invention, the thickness of the vertical wall increases from the top downward, and the thickness of the top of the vertical wall is not less than 0.2m.

[0011] As a further improvement of the present invention, the wall surface of the vertical wall close to the bottom of the slope is a vertical wall surface, and the slope of the wall surface away from the bottom of the slope is 1:0.1~1:0.3.

[0012] As a further improvement of the present invention, the tension beam, the vertical wall and the anchor block are an integrally cast reinforced concrete structure.

[0013] As a further improvement of the present invention, the anchor blocks are multiple and spaced apart in the longitudinal direction of the steep slope road; or, the anchor blocks are continuously arranged in the longitudinal direction of the steep slope road to form an anchor wall.

[0014] As a further improvement of the present invention, the prestressed anchor cable is arranged obliquely downward in the stratum, and the inclination angle of the prestressed anchor cable is 10°~20°;

[0015] and / or

[0016] The controlled stress of the prestressed anchor cable tensioning does not exceed 0.65 times the standard strength value of the steel strand.

[0017] As a further improvement of the present invention, the length of the tension beam is not less than 3.5m.

[0018] Another aspect of the utility model provides a steep slope road structure, which includes the steep slope embankment support structure, and also includes a backfill layer arranged on the side of the vertical wall away from the bottom of the slope, and a road structure layer arranged above the backfill layer; and the tension beam and the anchor block are buried in the backfill layer.

[0019] As a further improvement of the present invention, the top of the vertical wall extends to the top surface of the road structure layer.

[0020] As a further improvement of the present invention, the buried depth of the tension beam is not less than the thickness of the road structure layer; and / or the buried depth of the tension beam is 0.6-0.8 m.

[0021] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0022] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0023] (1) The steep slope embankment retaining structure of the present invention comprises a plurality of pile foundations arranged at intervals, and correspondingly provided with a cap and a vertical wall extending longitudinally, and provided with an anchor block fixed by a prestressed anchor cable for the vertical wall, and a tension beam provided between the anchor block and the vertical wall. The combination of the tension beam and the anchor block can effectively improve the structural toughness of the vertical wall, ensure the safety and stability of the steep slope embankment retaining structure, thereby improving the reliability of the design and operation of the steep slope road, extending the service life of the road, and reducing the maintenance cost of the road.

[0024] (2) The steep slope embankment retaining structure of the present invention can further improve the structural toughness of the steep slope embankment retaining structure by optimizing the design of the structural form of the vertical wall and the setting form and fixing method of the anchor block, simplify the construction process of the steep slope embankment retaining structure, and fully ensure the stability of the setting and operation of the embankment retaining structure.

[0025] (3) The steep slope road structure of the utility model can significantly improve the structural toughness of the retaining structure while meeting the construction and operation requirements of the steep slope road structure through the design optimization of the steep slope embankment retaining structure, and improve the structural stability of the steep slope road under the influence of disasters such as earthquakes and landslides, thereby ensuring the safe operation of the road structure and extending the service life of the road structure.

[0026] (4) The steep slope embankment retaining structure in the utility model has a simple structure and is easy to construct. It can effectively improve the retaining capacity and structural toughness of the steep slope embankment retaining structure, ensure the structural stability and reliability of the steep slope embankment retaining structure and the steep slope road structure during construction and operation, and has excellent practical value and application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 This is a schematic cross-sectional view of a steep slope embankment retaining structure in an embodiment of the present invention;

[0029] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0030] 1. Slope line; 2. Pile foundation; 3. Cap; 4. Vertical wall; 5. Tension beam; 6. Anchor block; 7. Prestressed anchor cable; 8. Road structure layer; 9. Roadbed centerline; 10. Stratum. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0032] In the description of the present invention, it should be understood that, unless otherwise expressly specified and limited, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to 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, and do not indicate or imply 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.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] Example:

[0037] See also Figure 1 The steep slope embankment retaining structure in the preferred embodiment of the present invention is set in a steep slope area, aiming to ensure the operational safety and structural stability of the steep slope road structure constructed in the steep slope area.

[0038] In a preferred embodiment, the slope line 1 of the steep slope is as follows Figure 1 As shown in , it is necessary to excavate and construct a steep slope road on the slope of the steep slope. Corresponding to the design and construction of the steep slope road, a steep slope embankment retaining structure in a preferred embodiment is designed and constructed.

[0039] Specifically, the steep slope embankment retaining structure in the preferred embodiment includes a plurality of pile foundations 2 arranged at intervals along the longitudinal direction of the steep slope road structure, and the spacing between two adjacent pile foundations 2 is determined according to actual design requirements, for example, 5m.

[0040] In more detail, the pile foundation 2 in the preferred embodiment is constructed below the road structure on one side close to the bottom of the slope, with its bottom extending into the stratum 10 and the top extending to the slope surface, and a pedestal 3 is provided at the top of each pile foundation 2 along the longitudinal extension.

[0041] In actual setting, the width of the cap 3 is larger than the outer diameter of the pile foundation 2, and its two lateral sides protrude from the outer peripheral wall of the pile foundation 2. More preferably, the protruding width of the cap 3 near the top of the slope is larger than the protruding width near the bottom of the slope, such as Figure 1 As shown in .

[0042] It can be understood that the side of the cap 3 close to the top of the slope is located below the steep slope road structure, and its bottom is supported on the steep slope stratum 10.

[0043] Furthermore, a vertical wall 4 is provided on the cap 3 along the longitudinal extension. The height of the vertical wall 4 corresponds to the road surface position of the steep slope road, and its vertical position preferably corresponds to the setting position of the pile foundation 2.

[0044] In more detail, in the preferred embodiment, the cross-sectional shape of the vertical wall 4 is preferably a trapezoid, and further preferably as follows Figure 1In the right-angled trapezoid shown in FIG, the side of the vertical wall 4 facing the bottom of the slope is a vertical end face, and the side away from the bottom of the slope is an inclined end face.

[0045] At the same time, the thickness of the vertical wall 4 in the preferred embodiment increases from the top to the bottom, and the thickness of the top is not less than 0.2m. More preferably, the slope of the wall 4 away from the bottom of the slope is preferably 1:0.1 to 1:0.3.

[0046] In actual setting, the pile foundation 2, the cap 3, and the vertical wall 4 are reinforced concrete structures, and the concrete strength grade is preferably not less than C30.

[0047] More specifically, to enhance the structural resilience of the retaining wall structure, several tension beams 5 are installed on the side of the vertical wall 4 facing away from the slope bottom. Each tension beam 5 is buried below the road structure layer 8 of the steep road structure, and is preferably buried in the backfill layer on the side of the vertical wall 4 facing away from the slope bottom. In a preferred embodiment, the tension beams 5 extend transversely along the road, with one end connected to the upper middle portion of the vertical wall 4 and an anchor block 6 fixed to the other end.

[0048] In actual setting, the tension beam 5 is preferably a reinforced concrete structure, which is further preferably cast integrally with the vertical wall 4; at the same time, the lateral extension length of the tension beam 5 is preferably not less than 3.5m, and the buried depth of the tension beam 5 is not less than the thickness of the road structure layer 8 of the road structure, preferably not less than 0.6~0.8m.

[0049] At the same time, the anchor blocks 6 in the preferred embodiment are also buried in the soil layer below the road structure layer 8, which is preferably a cast-in-place reinforced concrete structure. In actual installation, the anchor blocks 6 are preferably spaced apart in the longitudinal direction of the road, and their spacing is further preferably corresponding to the spacing of the pile foundations 2.

[0050] Of course, according to actual design requirements, the anchor block 6 can also be set as a longitudinally continuous structure to form an anchor wall.

[0051] Corresponding to the fixation of the anchor block 6 , a prestressed anchor cable 7 is further provided, one end of which is anchored in the stratum 10 , and the other end is tensioned and fixed on the anchor block 6 .

[0052] Specifically, the prestressed anchor cable 7 is preferably extended in an oblique downward direction, the inclination angle thereof is preferably 10° to 20°, and the diameter of the anchor hole is preferably 110 mm.

[0053] In addition, for the prestressed anchor cable 7, the control stress of the anchor cable tensioning is preferably not more than 0.65 times the standard strength value of the steel strand.

[0054] Furthermore, during actual construction, corresponding to the steep slope embankment retaining structure in the preferred embodiment, the construction process is preferably as follows:

[0055] (1) First, carry out the leveling operation before entering the site. According to the construction design plan, excavate the pile foundation 2 construction platform on the steep slope, and implement necessary temporary protection on the platform slope for safety.

[0056] During actual construction, the aforementioned construction platform is preferably set at a position corresponding to the top of the pile foundation 2, for example, at a position flush with the top or bottom surface of the base 3; after the construction platform is set up, the construction of the pile foundation 2 is carried out until all construction operations of the pile foundation 2 are completed.

[0057] Preferably, during construction, the spacing between two adjacent pile foundations 2 is preferably 3 to 6 meters, and more preferably 5 meters.

[0058] (2) Carry out the construction of the cap 3, tension beam 5, anchor block 6, and vertical wall 4;

[0059] During construction, the construction in the longitudinal direction of the road is preferably carried out in sections. For example, in a preferred embodiment, the above structure is constructed in sections of 10 meters each, first tying the steel mesh / steel cage, then supporting the formwork and pouring the concrete.

[0060] It is not difficult to understand that when carrying out the above-mentioned construction, it is necessary to reserve drainage holes, anchor holes at designed positions, etc. according to the design to facilitate the subsequent construction process.

[0061] At the same time, when constructing the vertical wall 4, it is necessary to determine the structural form of the end faces on both sides of the vertical wall 4 according to the design plan, that is, to determine the slope of the end faces on both sides of the vertical wall 4. Figure 1 In the preferred embodiment shown, the side of the vertical wall 4 facing away from the anchor block 6 is set as a vertical wall, while the side of the vertical wall 4 close to the anchor block 6 is an inclined wall, the slope of which is preferably 1:0.1~1:0.3, and the thickness of the vertical wall 4 increases from the top to the bottom, and the thickness of the top is not less than 0.2m.

[0062] More specifically, during the actual construction of the vertical wall 4, the concrete strength grade of the wall should preferably be no less than C30, and the diameter of the stress-bearing steel bars should be no less than 12mm. Furthermore, during segmented construction, expansion joints should be provided at the junctions between adjacent sections, with a width of preferably 20mm to 30mm. The expansion joints should also be filled with asphalt tendons or other elastic waterproof materials to a depth of no less than 150mm.

[0063] (3) Anchor holes for prestressed anchor cables 7 are constructed on the slope where anchor blocks 6 are constructed;

[0064] In actual installation, the anchor hole diameter is preferably 100 mm to 120 mm, for example 110 mm. Furthermore, in the preferred embodiment, the anchor hole extends downwardly with respect to the horizontal plane, with the centerline of the anchor hole tilted at an angle of 10° to 20° relative to the horizontal plane. The depth is determined by the required anchoring force required for the calculation, which is not detailed here.

[0065] After completing the construction of the anchor hole, it is preferred to use a high-pressure air gun to clean the rock debris in the hole and temporarily use a hole plug to seal it.

[0066] (4) After the pile foundation 2, pedestal 3, vertical wall 4, tension beam 5, and anchor block 6 have met the curing cycle and reached the strength requirements, backfill soil and filter layer on one side of the vertical wall 4 are filled until the anchor hole mouth; thereafter, the anchor end of the anchor cable is applied in the anchor hole, and after the cement mortar in the anchor hole meets the curing cycle and solidification strength requirements, the remaining backfill soil is filled.

[0067] During actual construction, the concrete setting period of the pile foundation 2, the cap 3, the vertical wall 4, the tension beam 5, and the anchor block 6 is preferably not less than 28 days, and the setting time of the cement mortar in the anchor hole is also not less than 28 days.

[0068] At the same time, when grouting in anchor holes, it is necessary to clean the holes in advance and discharge the accumulated water in the holes. The grouting pipe should be placed in the hole at the same time as the anchor cable. When grouting into horizontal holes or downward-inclined holes, the grouting pipe outlet should be inserted 100~300mm from the bottom of the hole, and the slurry should be continuously poured from bottom to top. When grouting in upward-inclined boreholes, a sealing device should be installed at the hole mouth. Grouting can be stopped when the slurry overflows from the hole mouth or the exhaust pipe stops exhausting and meets the grouting requirements.

[0069] (5) The free end of the anchor cable is passed through the anchor hole reserved on the anchor block 6, and tensioning is started step by step. After the required pulling force is reached, the anchor cable is locked and the anchor pier is constructed. After the final solidification, the remaining anchor cable part is cut off to complete the setting of the prestressed anchor cable 7.

[0070] In actual setting, the anchor hole positioning deviation of the prestressed anchor cable 7 is preferably not greater than 20.0 mm, and the deflection of the anchor hole is not greater than 2%. The drilling depth of the anchor hole exceeds the design length of the anchor cable and the excess length is not less than 0.5 m.

[0071] More specifically, during actual anchor cable tensioning, it is preferable to control the tensioning stress to no more than 0.65 times the standard strength of the steel strand. Before formal tensioning, a pre-tensioning force of 0.1 to 0.2 times the anchor cable's axial tension should be applied, and the anchor cable should be pre-tensioned once or twice to ensure close contact between all parts and a completely straight rod. Furthermore, it is preferable to over-tension the anchor cable to 1.10 to 1.20 times its designed prestress value. The retained prestress value should meet design requirements. For projects requiring high displacement control of the stratum and anchored structure, the locking value of the prestressed anchor cable is preferably the anchor cable's characteristic axial tension value. For projects where a certain degree of deformation of the stratum and anchored structure is tolerated, the locking value of the prestressed anchor cable should be 0.75 to 0.90 times its designed prestress value.

[0072] Through the above construction process, the construction of the steep slope embankment retaining structure in the preferred embodiment can be completed, effectively improving the toughness and structural stability of the steep slope embankment retaining structure.

[0073] Furthermore, as another aspect of the present invention, after the construction of the steep slope embankment retaining structure is completed, the roadbed centerline 9 is further Figure 1 The steep slope road construction shown in the figure finally obtains a steep slope road structure with a steep slope embankment support structure.

[0074] Specifically, the steep slope road structure in the preferred embodiment is arranged on the backfill soil layer and the excavated soil layer on the side of the vertical wall 4 close to the anchor block 6. Corresponding to the construction requirements of the road, a road structure layer 8 is provided. The construction of the road structure layer 8 can be carried out according to the construction specifications of the road structure, which will not be elaborated here.

[0075] In more detail, in actual configuration, the buried depth of the tension beam 5 is greater than the thickness of the pavement structure layer, and the thickness of the pavement structure layer in the preferred embodiment is preferably 0.6-0.8 m.

[0076] More preferably, in actual setting, the setting length of the tension beam 5 is not less than 3.5m, and it is further preferred that it crosses the roadbed center line 9, such as Figure 1 As shown in .

[0077] In addition, in actual setting, the top of the road structure layer 8 is preferably flush with the top of the vertical wall 4, such as Figure 1 As shown in .

[0078] Of course, in actual setting, a drainage ditch is opened on the side of the steep slope road structure away from the vertical wall 4, or a guardrail structure is set on the top of the side close to the vertical wall 4, which will not be described in detail here.

[0079] The steep slope embankment support structure in the utility model has a simple structure and is easy to construct. It can effectively improve the support capacity and structural toughness of the steep slope embankment support structure, ensure the structural stability and reliability of the steep slope embankment support structure and the steep slope road structure construction and operation, and has excellent practical value and application prospects.

[0080] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A steep slope embankment retaining structure, characterized in that: It includes multiple pile foundations spaced longitudinally along the steep slope road; One end of the pile foundation extends into the ground, and the other end extends to the slope surface of the steep slope; and a cap is provided on the top of each pile foundation, and a vertical wall is provided on the cap extending longitudinally along the steep slope road; The top of the vertical wall extends to the top of the road structure layer, and a tension beam and an anchor block are embedded on the side of the vertical wall away from the bottom of the slope; the tension beam is arranged in a plurality of intervals in the longitudinal direction of the steep slope road, one end of which is fixedly connected to the vertical wall and the other end is fixed to the corresponding anchor block; and A prestressed anchor cable is also provided corresponding to the anchor block. One end of the prestressed anchor cable is anchored in the stratum, and the other end is tensioned and fixed on the corresponding anchor block.

2. The steep slope embankment retaining structure according to claim 1, characterized in that: The thickness of the vertical wall increases from the top to the bottom, and the thickness of the top of the vertical wall is not less than 0.2m.

3. The steep slope embankment retaining structure according to claim 2, characterized in that: The wall surface of the vertical wall close to the bottom of the slope is a vertical wall surface, and the slope of the wall surface away from the bottom of the slope is 1:0.1-1:0.

3.

4. The steep slope embankment retaining structure according to any one of claims 1 to 3, characterized in that: The tension beam, the vertical wall and the anchor block are an integrally cast reinforced concrete structure.

5. The steep slope embankment retaining structure according to any one of claims 1 to 3, characterized in that: The anchor blocks are multiple and spaced apart in the longitudinal direction of the steep slope road; or the anchor blocks are continuously arranged in the longitudinal direction of the steep slope road to form an anchor wall.

6. The steep slope embankment retaining structure according to any one of claims 1 to 3, characterized in that: The prestressed anchor cable is arranged obliquely downward in the stratum, and the inclination angle of the prestressed anchor cable is 10° to 20°; and / or The controlled stress of the prestressed anchor cable tensioning does not exceed 0.65 times the standard strength value of the steel strand.

7. The steep slope embankment retaining structure according to any one of claims 1 to 3, characterized in that: The length of the tension beam is not less than 3.5m.

8. A steep slope road structure comprising the steep slope embankment retaining structure according to any one of claims 1 to 7, characterized in that: It also includes a backfill soil layer arranged on the side of the vertical wall away from the bottom of the slope, and a road structure layer arranged above the backfill soil layer; and the tension beam and the anchor block are buried in the backfill soil layer.

9. The steep slope road structure according to claim 8, characterized in that: The top of the vertical wall extends to the top surface of the road structure layer.

10. The steep slope road structure according to claim 8 or 9, characterized in that: The buried depth of the tension beam is not less than the thickness of the road structure layer; and / or the buried depth of the tension beam is 0.6-0.8m.

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