Roadbed widening and heightening structure based on existing side slope
By using fill reinforced structure and shear frame to strengthen the roadbed connection during the roadbed width assembly process, combined with the protective slope structure, the problems of insufficient strength and settlement deformation of the roadbed foundation are solved, and the stability and protective effect of the roadbed structure are achieved.
Patent Information
- Application Number
- CN202421002943.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-27
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the prior art, the foundation structure is insufficient during the splicing structure of the new and old roadbeds, resulting in uneven settlement of the road surface and prone to longitudinal cracks. In addition, a large amount of untreated land needs to be occupied during the construction of the roadbed width, resulting in slippage of the cushion layer.
The back excavated part of the original road slope line and its widened subgrade mechanism are used to form a widened foundation fill layer, and a T-shaped shear frame and L-shaped slope mesh plate are installed at the connection between the new and old roadbeds. , enhance the connection strength and deformation resistance, use lightweight filler to spread and roll, form widened subgrade and pavement structures, and set up protective slope structures on the roadside to prevent soil loss.
Improve the strength of the road base foundation, reduce the settlement deformation of the widened parts of the road, enhance the integrity and deformation resistance of the new and old road base connections, prevent the road surface cracking, and convenient drainage through the protective slope structure to prevent soil loss from the road base. Structural destruction.
Smart Images
Figure CN222251561U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of reconstruction and expansion engineering of old road slope sections, in particular to a widening and heightening structure based on an existing slope roadbed. Background Art
[0002] With the continuous development of the economy and the continuous progress of the rural economy in recent years, people's requirements for quality of life are getting higher and higher. Road access is one of the basic facilities for people's daily travel. In order to ensure that people travel more comfortably and conveniently. Many existing roads are restricted by the social and economic level, technical level and construction concept at the time of construction. A considerable part of them can no longer meet the requirements of traffic growth and social development. The reconstruction and expansion of existing roads has become a solution besides the construction of new roads, and it has played an increasingly important role in road construction.
[0003] During the reconstruction and expansion, the problem of roadbed widening is often encountered. The roadbed widening technology is directly related to the settlement of the entire roadbed and the normal traffic of the road. From previous engineering cases, it can be seen that if the widening position of the new and old roadbeds is not handled properly, it is easy to cause uneven settlement, which in turn causes longitudinal cracks in the pavement structure. Therefore, when paving the widened section, it is necessary to strengthen the combination of the new and old roadbed parts, so that the shear resistance of the combined parts can be increased, so that the uneven settlement of the new and old roadbeds can be stabilized, so as to prevent the settlement of the new roadbed from damaging the old roadbed. At the same time, during the roadbed widening construction process, the original roadbed slope protection needs to be excavated in reverse. During the roadbed widening construction process, the new roadbed needs to be sloped again, occupying a large amount of untreated land outside the original foundation fill layer. In the past, the cushion layer of the widened part of the new and old roadbeds was only compacted, and a single cushion layer may also cause the cushion layer to slip. Utility Model Content
[0004] Technical problem to be solved: In view of the problem of insufficient structural strength of the foundation of the widened roadbed structure in the process of splicing the new and old roadbeds in the prior art, the utility model provides a widening and heightening structure based on the existing slope roadbed, and a fill reinforcement structure is adopted in the back-excavated part of the original road slope line and the widened foundation fill layer under the widened roadbed mechanism to improve the foundation strength of the existing slope roadbed widening and heightening structure and reduce the settlement and deformation of the later stage of the highway widening part.
[0005] Technical solution: The utility model is a structure for widening and raising the existing slope roadbed, comprising an original foundation fill layer and an original roadbed structure and an original pavement structure sequentially arranged thereon, and along the original road slope line on one or both sides of the original roadbed structure and the original pavement structure, multiple reverse steps are dug inward from bottom to top along the thickness direction to form a step joint surface, and a widened foundation pit is excavated along the original foundation fill layer corresponding to the original road slope line, and a fill reinforcement structure is arranged in the widened foundation pit along the direction of highway travel and backfilled to form a widened foundation fill layer; the original roadbed structure and the original pavement structure are correspondingly widened on one or both sides to form a widened roadbed structure and a widened pavement structure, and the widened roadbed structure and the widened pavement structure are formed by paving and rolling with lightweight fillers.
[0006] Preferably, the fill reinforcement structure comprises a supporting top mesh plate along the top of the widened foundation fill layer and supporting side mesh plates vertically arranged outside the widened foundation fill layer;
[0007] The bottom of the supporting top mesh plate is provided with multiple vertical support rods arranged in rows and columns along the widening width and the direction of direction, and the inner side of the supporting side mesh plate is provided with multiple transverse tie rods arranged in layers and columns along the widening thickness and the direction of direction. The transverse tie rods in the same cross section of the widened foundation fill layer correspondingly penetrate the multiple vertical support rods and extend to the original foundation fill layer to form a mesh structure.
[0008] Preferably, a T-shaped anti-shear frame is fixedly mounted on each reverse step of the step joint surface corresponding to the original roadbed structure; a plurality of L-shaped slope mesh plates are sequentially arranged from top to bottom along the slope of the outer edge of the widened roadbed structure to form a stepped structure, and a tensioned steel mesh plate is horizontally arranged on the inner side of each L-shaped slope mesh plate along the thickness direction of the widened roadbed structure, and both ends of the tensioned steel mesh plate are respectively fixedly connected to the T-shaped anti-shear frame and the L-shaped slope mesh plate of the corresponding height to form an integrated structure.
[0009] Preferably, the T-shaped shear frame includes a horizontal frame and a vertical frame arranged perpendicular to the horizontal frame, the two ends of the horizontal frame respectively form a first support end and a second support end, and the lower end of the vertical frame forms a third support end; the first support end and the third support end are respectively fixedly connected to the corresponding surfaces of the reverse step through soil nails, and the second support end extends into the widened roadbed structure.
[0010] Preferably, a vertical shear plate frame is longitudinally arranged on a first-level reverse step corresponding to the interface between the original roadbed structure and the original pavement structure, and the vertical shear plate frame is fixedly connected to the original roadbed structure through soil nails.
[0011] Preferably, the reverse step has a width of 600 to 1200 mm, a height of 200 to 400 mm, and a reverse slope of -2 to -4 degrees.
[0012] Preferably, the widened roadbed structure is located outside the L-shaped slope mesh plate and forms a new roadside slope surface through a leveling filler layer. A protective slope structure is laid on the new roadside slope surface. The protective slope structure includes a waterproof slope foot arranged along the foot of the new roadside slope surface, and a plurality of hexagonal solid blocks spliced into one along the waterproof slope foot. The new roadside slope surface is located on the upper side of the hexagonal solid blocks and is paved with a plurality of hexagonal hollow blocks. The hexagonal hollow blocks and the hexagonal solid blocks are spliced together to form an integrated grass-planting slope structure.
[0013] Preferably, the protective slope structure is provided with a plurality of pedestrian walkways at intervals along the slope direction of the grass-planting slope structure.
[0014] Preferably, an earth shoulder is provided at the top of the protective slope structure at the outer edge of the widened pavement structure.
[0015] Preferably, a drainage slope with a slope of 3% and a drainage ditch arranged outside the drainage slope are arranged outside the waterproof slope foot.
[0016] Compared with the prior art, the utility model has at least the following beneficial effects:
[0017] 1. The utility model adopts a fill reinforcement structure in the back-excavated part of the original road slope line and the widened foundation fill layer under the widened roadbed structure to improve the foundation strength of the existing slope roadbed widening and heightening structure and reduce the settlement deformation of the highway widening part in the later stage;
[0018] 2. Excavate at the junction of the new and old roadbeds to form a step joint surface, and set a T-shaped shear frame at the step joint surface to strengthen the connection strength of the new and old roadbeds, and use tie wires to connect multiple T-shaped shear frames into a whole to enhance the integrity of the new and old roadbeds; multi-level L-shaped slope mesh plates are buried outside the widened roadbed structure, and the L-shaped slope mesh plates are fixedly connected to the T-shaped shear frames through tensioned steel mesh plates of the same height, which can strengthen the strength of the junction of the new and old roadbeds, enhance the overall deformation resistance of the roadbed and pavement, and effectively prevent the road surface cracking caused by roadbed settlement;
[0019] 3. A protective slope structure is set on the new roadside slope of the widened roadbed structure. The protective slope structure is easy to construct, can drain the slope runoff in time, and prevent soil loss from damaging the widened roadbed structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the existing slope section roadbed widening and heightening structure of the utility model;
[0021] Figure 2 for Figure 1 Schematic diagram of the excavation and backfill structure of the Zhongyuan foundation;
[0022] Figure 3 for Figure 1 The enlarged structural diagram at A in the middle;
[0023] Figure 4 for Figure 1 The enlarged structural diagram at B in the middle;
[0024] Figure 5 for Figure 1 The enlarged structural diagram at C in the middle;
[0025] Figure 6 for Figure 1 Schematic diagram of the middle protection slope structure;
[0026] Figure 7 for Figure 6 Schematic diagram of the layout structure of the middle waterproof slope foot.
[0027] Figure numerals: 1. original foundation fill layer; 2. original roadbed structure; 3. original pavement structure; 4. original roadside slope line; 5. step interface; 6. widened pavement structure; 7. widened roadbed structure; 8. tensioned steel mesh; 9. earth shoulder; 10. leveling filler layer; 11. protective slope structure; 12. fill reinforcement structure; 121. supporting top mesh; 122. supporting side mesh; 123. vertical support rod; 124. horizontal tie rod; 13. waterproof slope foot; 14. drainage slope; 15. drainage ditch; 16. widened foundation fill layer; 17. vertical shear plate frame; 18. soil nails; 19. T-type shear frame; 191. first support end; 192. second support end; 193. third support end; 20. L-type slope mesh; 21. hexagonal hollow block; 22. hexagonal solid block; 23. pedestrian walkway. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the following will be combined with the attached Figures 1 to 7 The technical solution of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the described embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.
[0029] like Figures 1-2As shown, the utility model discloses a widening and heightening structure based on an existing slope roadbed, including an original foundation fill layer 1 and an original roadbed structure 2 and an original pavement structure 3 sequentially arranged thereon, and multiple reverse steps are dug inward from bottom to top along the original road slope line 4 on one side or both sides of the original roadbed structure 2 and the original pavement structure 3 along the thickness direction to form a step joint surface 5, the width of the reverse step is 600-1200mm, the height is 200-400mm, and the reverse slope is -2--4 degrees. A widened foundation pit is excavated along the original foundation fill layer 1 corresponding to the original road slope line 4, and a fill reinforcement structure 12 is arranged in the widened foundation pit along the direction of the highway and backfilled to form a widened foundation fill layer 16; the original roadbed structure 2 and the original pavement structure 3 are widened on one side or both sides to form a widened roadbed structure 7 and a widened pavement structure 6, and the widened roadbed structure 7 and the widened pavement structure 6 are formed by paving and rolling with light fillers. During the construction process of widening and raising the roadbed in the existing slope section, the utility model adopts a fill reinforcement structure 12 in the widened foundation fill layer 16 of the back-excavated part of the original road slope line 4 and the widened roadbed structure 7 below, so as to improve the foundation strength of the existing slope roadbed widening and raising structure and reduce the settlement deformation of the highway widening part in the later stage.
[0030] like Figure 2 As shown, the fill reinforcement structure 12 includes a supporting top mesh plate 121 along the top of the widened foundation fill layer 16 and a supporting side mesh plate 122 vertically arranged on the outside of the widened foundation fill layer 16; a plurality of vertical support rods 123 are arranged in rows and columns along the widened width and direction at the bottom of the supporting top mesh plate 121, and a plurality of transverse tie rods 124 are arranged in layers and columns along the widened thickness and direction on the inner side of the supporting side mesh plate 122; the transverse tie rods 124 at the same cross section of the widened foundation fill layer 16 correspondingly penetrate the plurality of vertical support rods 123 and extend to the original foundation fill layer 1 to form a mesh structure. Specifically, the vertical support rod 123 is provided with a plurality of installation grooves along the height direction of the rod body, and a plurality of transverse tie rods 124 on the same excavation surface correspondingly pass through the corresponding installation grooves of the plurality of vertical support rods 123, so that the plurality of transverse tie rods 124 and the vertical support rods 123 on the same excavation surface are fixedly connected to form a mesh structure, and a plurality of rows of mesh structures composed of transverse tie rods 124 and vertical support rods 123 are formed in the widened foundation fill layer 16 along the direction of highway travel, thereby improving the structural strength of the widened foundation fill layer 16.
[0031] like Figure 1 and Figures 3-4A T-shaped anti-shear frame 19 is fixedly mounted on each reverse step of the step joint surface 5 corresponding to the original roadbed structure 2; a plurality of L-shaped slope mesh panels 20 are sequentially arranged from top to bottom along the slope of the outer edge of the widened roadbed structure 7 to form a stepped structure, and a tensioned steel mesh panel 8 is horizontally arranged on the inner side of each L-shaped slope mesh panel 20 along the thickness direction of the widened roadbed structure 7, and both ends of the tensioned steel mesh panel 8 are respectively fixedly connected to the T-shaped anti-shear frame 19 and the L-shaped slope mesh panel 20 of the corresponding height to form an integrated structure. A step joint surface is formed by excavating at the junction of the new and old roadbeds, and a T-shaped shear frame is arranged corresponding to the step joint surface to strengthen the connection strength between the new and old roadbeds, and multiple T-shaped shear frames are connected into a whole by using tie wires to enhance the integrity of the new and old roadbeds; a stepped structure composed of multiple L-shaped slope mesh plates is buried outside the widened roadbed structure, and the L-shaped slope mesh plates are fixedly connected to the corresponding T-shaped shear frames through parallel tensioned steel mesh plates, so as to improve the anti-deformation ability of the widened roadbed structure such as anti-slip or settlement, thereby improving the stability of the highway widening structure.
[0032] like Figure 4 As shown, the T-shaped anti-shear frame 19 includes a horizontal frame and a vertical frame arranged perpendicular to the horizontal frame, the two ends of the horizontal frame respectively form a first support end 191 and a second support end 192, and the lower end of the vertical frame forms a third support end 193; the first support end 191 and the third support end 193 are respectively fixedly connected to the corresponding surface of the reverse step through soil nails 18, and the second support end 192 extends into the widened roadbed structure 7. The T-shaped anti-shear frame 19 adopts a steel cage structure, and the strength of the splicing structure of the new and old roadbeds can be strengthened by the T-shaped anti-shear frame 19, thereby improving the anti-settlement performance of the widened roadbed structure.
[0033] like Figure 3 As shown, a vertical shear plate frame 17 is longitudinally arranged on a first-level reverse step corresponding to the interface between the original roadbed structure 2 and the original pavement structure 3. The vertical shear plate frame 17 is fixedly connected to the original roadbed structure 2 through soil nails 18. The vertical shear plate frame 17 adopts a steel cage structure. The vertical shear plate frame 17 is fixedly connected to the original roadbed structure 2 through soil nails 18, thereby improving the connection strength between the roadbed structure and the pavement structure.
[0034] like Figures 5 to 7As shown, the widened roadbed structure 7 is located outside the L-shaped slope mesh plate 20 and a new roadside slope surface is formed by a leveling filler layer 10. A protective slope structure 11 is laid on the new roadside slope surface. The protective slope structure 11 includes a waterproof slope foot 13 arranged along the foot of the new roadside slope surface, and a plurality of hexagonal solid blocks 22 spliced into one body along the waterproof slope foot 13. The new roadside slope surface is located on the upper side of the hexagonal solid blocks 22 and a plurality of hexagonal hollow blocks 21 are laid. The hexagonal hollow blocks 21 and the hexagonal solid blocks 22 are spliced together to form an integrated grass-planting slope surface structure, and soil and grass can be planted in the hexagonal hollow blocks 21. The top of the protective slope structure 11 is located at the outer edge of the widened road surface structure 6 and is provided with an earth shoulder 9; a drainage slope 14 with a slope of 3% and a drainage ditch 15 are provided outside the waterproof slope foot 13. The runoff formed by the protective slope structure 11 can be promptly discharged through the drainage slope 14 and the drainage ditch 15 to prevent soil loss from damaging the widened roadbed structure. The protective slope structure 11 is provided with multiple pedestrian walkways 23 at intervals along the slope direction of the grass-planted slope structure to facilitate going up and down the road slope through the pedestrian walkways 23.
[0035] The above are preferred implementations of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications should also be regarded as the protection scope of the present utility model.
Claims
1. A structure for widening and heightening an existing slope roadbed, comprising an original foundation fill layer (1) and an original roadbed structure (2) and an original pavement structure (3) sequentially arranged thereon, and along the original road slope line (4) on one side or both sides of the original roadbed structure (2) and the original pavement structure (3), multiple reverse steps are dug inward from bottom to top along the thickness direction thereof to form a step joint surface (5), characterized in that: A widened foundation pit is excavated along the original foundation fill layer (1) corresponding to the original roadside slope line (4), and a fill reinforcement structure (12) is arranged in the widened foundation pit along the direction of the highway and backfilled to form a widened foundation fill layer (16); the original roadbed structure (2) and the original pavement structure (3) are widened on one side or both sides to form a widened roadbed structure (7) and a widened pavement structure (6), and the widened roadbed structure (7) and the widened pavement structure (6) are formed by paving and rolling with lightweight fillers.
2. The structure for widening and heightening existing slope roadbed according to claim 1 is characterized in that: The fill reinforcement structure (12) comprises a supporting top mesh plate (121) along the top of the widened foundation fill layer (16) and a supporting side mesh plate (122) vertically arranged on the outside of the widened foundation fill layer (16); The bottom of the supporting top mesh plate (121) has a plurality of vertical support rods (123) arranged in rows and columns along the widening width and the direction of travel, and the inner side of the supporting side mesh plate (122) has a plurality of transverse tie rods (124) arranged in layers and columns along the widening thickness and the direction of travel. The transverse tie rods (124) in the same cross section of the widened foundation fill layer (16) correspondingly penetrate the plurality of vertical support rods (123) and extend to the original foundation fill layer (1) to form a mesh structure.
3. The structure for widening and heightening existing slope roadbed according to any one of claims 1 to 2, characterized in that: A T-shaped anti-shear frame (19) is fixedly mounted on each reverse step of the step joint surface (5) corresponding to the original roadbed structure (2); multiple levels of L-shaped slope mesh panels (20) are arranged in sequence from top to bottom along the slope of the outer edge of the widened roadbed structure (7) to form a stepped structure; a tensioned steel mesh panel (8) is horizontally arranged on the inner side of each L-shaped slope mesh panel (20) along the thickness direction of the widened roadbed structure (7); and two ends of the tensioned steel mesh panel (8) are respectively fixedly connected to the T-shaped anti-shear frame (19) and the L-shaped slope mesh panel (20) at corresponding heights to form an integrated structure.
4. The structure for widening and heightening existing slope roadbed according to claim 3 is characterized in that: The T-shaped anti-shear frame (19) comprises a horizontal frame and a vertical frame arranged perpendicular to the horizontal frame, the two ends of the horizontal frame respectively form a first support end (191) and a second support end (192), and the lower end of the vertical frame forms a third support end (193); the first support end (191) and the third support end (193) are respectively fixedly connected to the corresponding surface of the reverse step through soil nails (18), and the second support end (192) extends into the widened roadbed structure (7).
5. The structure for widening and heightening existing slope roadbed according to claim 4 is characterized in that: A vertical shear plate frame (17) is longitudinally arranged on a first-order reverse step corresponding to the interface between the original roadbed structure (2) and the original pavement structure (3); the vertical shear plate frame (17) is fixedly connected to the original roadbed structure (2) via soil nails (18).
6. The structure for widening and heightening existing slope roadbed according to claim 5 is characterized in that: The width of the reverse step is 600-1200 mm, the height is 200-400 mm, and the reverse slope is -2-4 degrees.
7. The structure for widening and heightening existing slope roadbed according to claim 6 is characterized in that: The widened roadbed structure (7) is located outside the L-shaped slope mesh plate (20) and forms a new roadside slope surface through a leveling filler layer (10); a protective slope structure (11) is laid on the new roadside slope surface; the protective slope structure (11) comprises a waterproof slope foot (13) arranged along the slope foot of the new roadside slope surface, and a plurality of hexagonal solid blocks (22) spliced into one piece along the waterproof slope foot (13); the new roadside slope surface is paved with a plurality of hexagonal hollow blocks (21) located on the upper side of the hexagonal solid blocks (22); the hexagonal hollow blocks (21) and the hexagonal solid blocks (22) are spliced to form an integrated grass-planting slope surface structure.
8. The structure for widening and heightening existing slope roadbed according to claim 7 is characterized in that: The protective slope structure (11) is provided with a plurality of pedestrian walkways (23) at intervals along the slope direction of the grass-planting slope structure.
9. The structure for widening and heightening existing slope roadbed according to claim 7 is characterized in that: The top of the protective slope structure (11) is located at the outer edge of the widened road surface structure (6) and is provided with an earth shoulder (9).
10. The structure for widening and heightening existing slope roadbed according to claim 7 is characterized in that: A drainage slope (14) with a slope of 3% and a drainage ditch (15) arranged outside the drainage slope (14) are arranged outside the waterproof slope foot (13).