New and old roadbed splicing structure for road reconstruction
By excavating steps at the connection between new and old roadbeds and setting up T-shaped shear frames and prefabricated slope mesh panels, the problem of road surface cracking caused by uneven settlement of new and old roadbeds is solved, and the deformation resistance and stability of the roadbed is improved. It is applicable. Construction on widening the high embankment roadbed in soft soil areas.
Patent Information
- Application Number
- CN202421003097.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-10
AI Technical Summary
In the highway renovation and expansion project, the uneven settlement of new and old roadbeds leads to cracking and sliding of the road surface, and the existing technology is difficult to effectively solve the settlement problem of high embankment roadbeds in soft soil areas after widening.
Multi-stage reverse steps are excavated at the connections of new and old roadbeds, and T-shaped shearing frames are set on the joint surface of the steps, combining prefabricated slope mesh plates and tensile steel mesh plates to enhance the integrity and deformation resistance of the roadbed. Improve the stability and anti-slip performance of the roadbed through lightweight fillers and protective slope structures.
It effectively enhances the strength and overall deformation resistance of the joint parts of the new and old roadbeds, prevents pavement cracking, improves the stability and settlement resistance of the roadbed structure, and reduces the risk of uneven settlement and sliding.
Smart Images
Figure CN222226955U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of old road reconstruction and expansion engineering, in particular to a new and old roadbed splicing structure used for road reconstruction. Background Art
[0002] In order to meet the growing traffic demand and social development needs, more and more highway reconstruction and expansion projects are being carried out. Due to the settlement difference between the old road embankment and the new road embankment, the junction of the new and original embankments is prone to road cracking, local subsidence and other engineering quality problems. Figures 1-2 As shown in the figure, there are two main forms of damage to highway widening projects in my country: uneven settlement and instability, including: roadbed damage, retaining structure damage, pavement damage, and overall performance degradation of the pavement. The roadbed damage is mainly caused by the relatively large uneven settlement of the new and old roadbeds and the lateral deformation of the new roadbed after construction, which leads to the sliding of the new roadbed along the junction of the new and old roadbeds. In severe cases, it is possible to cause the entire widened roadbed to slide and become unstable.
[0003] In order to strengthen the connection between the new and old road surface and effectively control the uneven settlement of the new and old roadbeds, there are many treatment methods. Common reinforcement methods include excavating steps at the junction of the new and original embankments, laying geosynthetics reinforcement layers, and using lightweight fillers to fill the embankment. Among them, excavating steps at the junction of the new and original embankments means excavating steps within the filling range of the old embankment. This method is simple to construct and can enhance the connection strength of the junction between the new and original embankments to a certain extent; setting up geosynthetics reinforced cushion layers and reinforced soil embankments means laying geogrids, steel mesh and other materials within the filling range of the new embankment to enhance the integrity and strength of the filling; lightweight embankment filling means using lightweight fillers as embankment fillings. This method can greatly reduce the weight of the newly filled embankment and reduce the additional stress of the new filled embankment on the original embankment foundation. However, for the widening construction of high embankment roadbed in soft soil areas, the existing treatment methods are used. After the high embankment roadbed is widened, the uneven settlement of the new and old roadbeds is still quite obvious, especially on the widened side, the settlement difference of the slope range of the old roadbed is obvious, which is easy to produce uneven settlement cracks and sliding shear surfaces. Therefore, it is urgent to invent a new and old roadbed widening structure with strong anti-deformation ability of the new and old embankments. Utility Model Content
[0004] Technical problem to be solved: In view of the problems existing in the new and old roadbed splicing structure in the prior art, the utility model provides a new and old roadbed splicing structure for road reconstruction, which can strengthen the strength of the new and old roadbed joints, enhance the overall deformation resistance of the roadbed and pavement, and effectively prevent the road surface cracking problem caused by roadbed settlement.
[0005] Technical solution: The new and old roadbed splicing structure for road reconstruction described in the utility model includes an original roadbed structure and an original pavement structure thereon, and multiple reverse steps are dug from bottom to top along one or both sides of the original roadbed structure and the original pavement structure along their thickness direction to form a step joint surface, and a T-shaped anti-shear frame is fixedly mounted on each reverse step of the step joint surface corresponding to the original roadbed structure;
[0006] The original roadbed structure and the original pavement structure are widened on one side 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 light fillers;
[0007] A prefabricated slope mesh plate with a slope angle approximately the same as that of the slope is buried along the outer edge of the widened roadbed structure, and a plurality of tensioned steel mesh plates are horizontally layered along the thickness direction of the widened roadbed structure on the inner side of the prefabricated slope mesh plate. Both ends of the tensioned steel mesh plate are respectively fixedly connected to a T-shaped shear frame and the prefabricated slope mesh plate of corresponding height to form an integrated structure.
[0008] 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.
[0009] 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.
[0010] 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.
[0011] Preferably, a protective slope structure is arranged on the outer edge slope surface of the widened roadbed structure, and the protective slope structure comprises a plurality of transverse beams and longitudinal beams staggered along the advancing direction of the roadbed, and the adjacent transverse beams and longitudinal beams enclose a grass planting area;
[0012] An anchoring area is formed at the connection between the transverse beam frame and the longitudinal beam frame, and the anchoring area is fixedly connected to the widened roadbed structure through anchor rods.
[0013] Preferably, the anchor rods include a plurality of anchor rods arranged along the four sides and the center of the anchoring area, and the length of the anchor rods is 2 to 6 m.
[0014] Preferably, the protective slope structure is provided with a slope step along the center line of the slope protection, a first slope protection foot embedded in the widened roadbed structure is provided inside the slope step, and a drainage side groove is provided outside the first slope protection foot;
[0015] The protective slope structure is provided with a second slope protection foot along the bottom end of the slope protection foot, and a waterproof slope foot is provided outside the second slope protection foot.
[0016] Preferably, an earth shoulder is provided on the top surface of the widened roadbed structure at the outer edge of the widened pavement structure, and a drainage ditch is provided along the direction of the earth shoulder.
[0017] Compared with the prior art, the utility model has at least the following beneficial effects:
[0018] 1. The utility model excavates at the junction of the new and old roadbeds to form a step joint surface, and a T-shaped shear frame is correspondingly arranged on the step joint surface to strengthen the connection strength of the new and old roadbeds, and a plurality of T-shaped shear frames are connected into a whole by tying wires to enhance the integrity of the new and old roadbeds;
[0019] 2. Prefabricated slope mesh panels are buried outside the widened roadbed structure. The prefabricated slope mesh panels are fixedly connected with T-shaped shear frames by using multiple layered parallel tensioned steel mesh panels. The widened roadbed structure is backfilled and compacted with lightweight soil to improve the anti-slip or settlement and other anti-deformation capabilities of the widened roadbed structure and improve the stability of the new and old roadbed splicing structure;
[0020] 3. A protective slope structure is set on the slope of the widened roadbed structure, which can discharge the slope runoff in time and prevent soil loss from damaging the widened roadbed structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 Schematic diagram of the uncoordinated deformation structure caused by compression consolidation of the new and old roadbeds;
[0022] Figure 2 This is a schematic diagram of the uncoordinated deformation structure caused by the slippage at the junction of the new and old roadbeds;
[0023] Figure 3 This is a schematic diagram of the new and old roadbed splicing structure of the utility model;
[0024] Figure 4 for Figure 3 Schematic diagram of the middle protection slope structure;
[0025] Figure 5 for Figure 3 The enlarged structural diagram at A in the middle;
[0026] Figure 6 for Figure 3 The enlarged structural diagram at B in the middle;
[0027] Figure 7 for Figure 3 The enlarged structural diagram at C in the middle;
[0028] Figure 8 for Figure 3 The enlarged structural diagram at D in the middle;
[0029] Fig. 9 for Figure 4 Schematic diagram of anchor rod layout in the middle connection area.
[0030] Figure numerals: 1. original roadbed structure; 2. original pavement structure; 3. widened roadbed structure; 4. widened pavement structure; 5. step interface; 6. earth shoulder; 7. drainage ditch; 8. T-type shear frame; 81. first support end; 82. second support end; 83. third support end; 9. tensioned steel mesh; 10. prefabricated slope mesh; 11. protective slope structure; 111. transverse beam frame; 112. longitudinal beam frame; 113. anchoring area; 114. drainage ditch; 115. slope step; 116. grass planting area; 117. anchor rod; 118. first slope protection foot; 119. second slope protection foot; 1110. waterproof slope foot; 12. vertical shear plate frame; 13. soil nails. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical solution and advantages of the utility model clearer, the following will be combined with the attached Figures 3 to 9 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.
[0032] like Figure 3As shown, the utility model discloses a new and old roadbed splicing structure for road reconstruction, including an original roadbed structure 1 and an original pavement structure 2 thereon, and multiple reverse steps are dug from bottom to top along one side or both sides of the original roadbed structure 1 and the original pavement structure 2 along their thickness direction to form a step joint surface 5, 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. A T-shaped anti-shear frame 8 is fixedly mounted on each reverse step of the step joint surface 5 corresponding to the original roadbed structure 1; the original roadbed structure 1 and the original pavement structure 2 are widened on one side or both sides to form a widened roadbed structure 3 and a widened pavement structure 4, and the widened roadbed structure 3 and the widened pavement structure 4 are formed by paving and rolling with lightweight fillers; a prefabricated slope mesh plate 10 with a slope angle approximately the same as that of the slope is buried along the outer edge of the widened roadbed structure 3, and a plurality of tensioned steel mesh plates 9 are horizontally layered along the thickness direction of the widened roadbed structure 3 on the inner side of the prefabricated slope mesh plate 10, and both ends of the tensioned steel mesh plate 9 are respectively fixedly connected to the T-shaped anti-shear frame 8 and the prefabricated slope mesh plate 10 of corresponding heights to form an integrated structure. The utility model excavates at the connection of the new and old roadbeds to form a step joint surface, and a T-shaped shear frame is arranged corresponding to the step joint surface to strengthen the connection strength of the new and old roadbeds, and a plurality of T-shaped shear frames are connected into a whole by tying wires to enhance the integrity of the new and old roadbeds; a prefabricated slope mesh plate is buried outside the widened roadbed structure, and the prefabricated slope mesh plate is fixedly connected with the T-shaped shear frame by using a plurality of layered parallel tensioned steel mesh plates; the widened roadbed structure is backfilled and compacted with lightweight soil, so as to improve the anti-deformation ability of the widened roadbed structure such as anti-slip or settlement, and improve the stability of the new and old roadbed splicing structure.
[0033] like Figure 6 As shown, the T-type shear frame 8 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 81 and a second support end 82, and the lower end of the vertical frame forms a third support end 83; the first support end 81 and the third support end 83 are respectively fixedly connected to the corresponding surface of the reverse step through soil nails 13, and the second support end 82 extends into the widened roadbed structure 3. The T-type shear frame 8 adopts a steel cage structure, and the strength of the splicing structure of the new and old roadbeds can be strengthened by the T-type shear frame 8, thereby improving the anti-settlement performance of the widened roadbed structure.
[0034] like Figure 5 As shown, a vertical shear plate frame 12 is longitudinally arranged on a first-level reverse step corresponding to the interface between the original roadbed structure 1 and the original pavement structure 2. The vertical shear plate frame 12 adopts a steel cage structure. The vertical shear plate frame 12 is fixedly connected to the original roadbed structure 1 through soil nails 13 to improve the connection strength between the roadbed structure and the pavement structure.
[0035] like Figures 3-4As shown, a protective slope structure 11 is arranged on the outer edge slope of the widened roadbed structure 3, and the protective slope structure 11 includes a plurality of transverse beams 111 and longitudinal beams 112 staggered along the advancing direction of the roadbed, and the adjacent transverse beams 111 and longitudinal beams 112 enclose a grass planting area 116. An anchoring area 113 is formed at the connection between the transverse beams 111 and the longitudinal beams 112, and the anchoring area 113 is fixedly connected to the widened roadbed structure 3 through anchor rods 117; specifically, the anchor rods 117 include a plurality of anchor rods arranged along the four sides and the center of the anchoring area 113, and the length of the anchor rods 117 is 2 to 6 meters. The cooperation of the plurality of anchor rods can improve the connection strength between the protective slope structure 11 and the widened roadbed structure 3.
[0036] In an alternative embodiment, if Figures 7-8 As shown, the protective slope structure 11 is provided with a slope step 115 along the center line of the slope protection, and a first slope protection foot 118 embedded in the widened roadbed structure 3 is provided on the inner side of the slope step 115, and a drainage side groove 114 is provided on the outer side of the first slope protection foot 118; the protective slope structure 11 is provided with a second slope protection foot 119 along the bottom end of the slope protection foot, and a waterproof slope foot 1110 is provided on the outer side of the second slope protection foot 119. This arrangement can improve the drainage performance of the protective slope structure 11 and prevent soil loss from damaging the widened roadbed structure.
[0037] like Figure 3 As shown, the top surface of the widened roadbed structure 3 is located at the outer edge of the widened pavement structure 4 and is provided with an earth shoulder 6, and a drainage ditch 7 is opened along the direction of the earth shoulder 6.
[0038] 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 new and old roadbed splicing structure for road reconstruction, comprising an original roadbed structure (1) and an original pavement structure (2) thereon, wherein a plurality of reverse steps are dug from bottom to top along one or both sides of the original roadbed structure (1) and the original pavement structure (2) along their thickness direction to form a step joint surface (5), characterized in that: A T-shaped anti-shear frame (8) is fixedly mounted on each reverse step of the step joint surface (5) corresponding to the original roadbed structure (1); The original roadbed structure (1) and the original pavement structure (2) are widened on one side or both sides to form a widened roadbed structure (3) and a widened pavement structure (4), and the widened roadbed structure (3) and the widened pavement structure (4) are formed by paving and rolling with light fillers; A prefabricated slope mesh plate (10) having an inclination angle substantially the same as the slope gradient is buried along the outer edge of the widened roadbed structure (3); a plurality of tensioned steel mesh plates (9) are horizontally layered along the thickness direction of the widened roadbed structure (3) on the inner side of the prefabricated slope mesh plate (10); and both ends of the tensioned steel mesh plate (9) are respectively fixedly connected to a T-shaped shear frame (8) and the prefabricated slope mesh plate (10) of a corresponding height to form an integrated structure.
2. The new and old roadbed splicing structure for road reconstruction according to claim 1 is characterized in that: The T-shaped anti-shear frame (8) 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 (81) and a second support end (82), and the lower end of the vertical frame forms a third support end (83); the first support end (81) and the third support end (83) are respectively fixedly connected to the corresponding surface of the reverse step through soil nails (13), and the second support end (82) extends into the widened roadbed structure (3).
3. The new and old roadbed splicing structure for road reconstruction according to claim 2 is characterized in that: A vertical shear plate frame (12) is longitudinally arranged on a first-order reverse step corresponding to the interface between the original roadbed structure (1) and the original pavement structure (2); the vertical shear plate frame (12) is fixedly connected to the original roadbed structure (1) via soil nails (13).
4. The new and old roadbed splicing structure for road reconstruction according to claim 3 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.
5. The new and old roadbed splicing structure for road reconstruction according to any one of claims 1 to 4, characterized in that: A protective side slope structure (11) is arranged on the outer edge slope surface of the widened roadbed structure (3), and the protective side slope structure (11) comprises a plurality of transverse beam frames (111) and longitudinal beam frames (112) arranged in a staggered manner along the advancing direction of the roadbed, and the adjacent transverse beam frames (111) and longitudinal beam frames (112) enclose a grass planting area (116); An anchoring area (113) is formed at the connection between the transverse beam frame (111) and the longitudinal beam frame (112), and the anchoring area (113) is fixedly connected to the widened roadbed structure (3) through an anchor rod (117).
6. The new and old roadbed splicing structure for road reconstruction according to claim 5 is characterized in that: The anchor rods (117) include a plurality of anchor rods arranged along the four sides and the center of the anchoring area (113), and the length of the anchor rods (117) is 2 to 6 meters.
7. The new and old roadbed splicing structure for road reconstruction according to claim 6 is characterized in that: The protective slope structure (11) is provided with a slope step (115) along the center line of the slope protection, a first slope protection foot (118) embedded in the widened roadbed structure (3) is provided inside the slope step (115), and a drainage side groove (114) is provided outside the first slope protection foot (118); The protective slope structure (11) is provided with a second slope protection foot (119) along the bottom end of the slope protection foot, and a waterproof slope foot (1110) is provided outside the second slope protection foot (119).
8. The new and old roadbed splicing structure for road reconstruction according to claim 5 is characterized in that: The top surface of the widened roadbed structure (3) is located at the outer edge of the widened pavement structure (4) and is provided with an earth shoulder (6), and the earth shoulder (6) is provided with a drainage ditch (7) along its direction.