Municipal road subgrade splicing structure
By opening multiple steps, sinking grooves and reinforcement holes in the roadbed splicing structure of municipal roads, and pouring concrete base on the new sections and extending to the steps, the problem of dislocation and cracking of new and old sections is solved, the connection strength and stability of the roadbed are improved, and the difficulty of transverse tearing is reduced.
Patent Information
- Application Number
- CN202420993383.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-05-08
AI Technical Summary
During the road renovation and expansion process, the problem of dislocation cracking in the old and new road sections is more prominent. The main reasons include insufficient roadbed junctions, large foundation fluidity, and different support and deformation of the new and old sections, especially in areas with abundant rainfall, which increases the chance of cracking.
A municipal road subgrade splicing structure is adopted, including soft soil subgrade one and two, as well as concrete base layer. By opening multiple steps, sinking grooves and reinforced holes on the side of the old section, and pouring concrete base layer on the new section, extending to the ladder, enhancing the connection strength and stability of the subgrade.
By extending the roadbed of the new roadbed to the old roadbed, the consistency of the overall structure is improved, so that the force effect of vehicles when passing through is not only on the new road section, but also on the old road surface, reducing the difficulty of lateral tearing between the new and old road surfaces.
Smart Images
Figure CN223003243U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of road construction, and in particular to a splicing structure for a municipal road subgrade. Background Art
[0002] During road reconstruction and expansion, construction units and workers generally do not completely remove the old road structure, but retain sections with high structural integrity that can be reused; at this time, there is a need for subgrade connection.
[0003] Currently, the most common problem in the connection section between the new and old road surfaces is: dislocation and cracking between the new and old sections; the reasons for the cracking are diverse, including at least: insufficient joint of the subgrade, and fluidity of the foundation. Especially in areas with relatively abundant rainfall, the subgrade support and deformation of the new and old sections are different, increasing the probability of cracking. Therefore, this application proposes a new technical solution. Utility Model Content
[0004] In order to reduce the probability of cracking and deformation between the new and old road surfaces, this application provides a splicing structure for a municipal road subgrade.
[0005] This application provides a splicing structure for a municipal road subgrade, adopting the following technical solutions:
[0006] A splicing structure for a municipal road subgrade includes a first soft soil subgrade layer, a second soft soil subgrade layer, and a concrete base layer. The first soft soil subgrade layer and the first concrete base layer are the structural layers of the old section, and the second soft soil subgrade layer is the structural layer of the new section obtained by ramming;
[0007] The first concrete base layer is poured on the upper part of the first soft soil subgrade layer and is used for laying an asphalt / concrete surface layer;
[0008] On the side of the first concrete base layer close to the soft soil in the second subgrade layer, a multi-level step is provided. The widths of the multi-level steps are different and the step surfaces are roughened surfaces; several sinking grooves and reinforcement holes are provided on the steps, and vertical reinforcements extending upward out of the reinforcement holes are arranged in the reinforcement holes;
[0009] A second concrete base layer is poured on the second soft soil subgrade layer, and the second concrete base layer extends to the steps.
[0010] Optionally, several grooves extending in the width direction are provided on the upper part of the second concrete base layer. Drain pipes are placed in the grooves. The drain pipes are hidden in the grooves and are of a hollow structure, and one end of the drain pipes extends out of the side of the road.
[0011] Optionally, a flexible contact layer is arranged on the inner wall surrounding the sinking grooves.
[0012] Optionally, a plurality of steel bars penetrate through the wall of the sinking groove.
[0013] Optionally, the bottom of the sinking groove bulges upward.
[0014] Optionally, a plurality of pile holes are provided in the second soft soil roadbed layer, and anchor struts are arranged in the pile holes and extend out of the pile holes.
[0015] Optionally, one end of the anchor strut extending out of the pile hole extends laterally to form an end block. The end block is separated from the second soft soil roadbed layer. A pre-buried rod is arranged in the end block. The pre-buried rod extends downward out of the end block. A lifting sleeve is threadedly connected to a section of the pre-buried rod outside. The lower end of the lifting sleeve is rotatably connected to a pressing block, and a clamping groove is formed by the upward depression of the pressing block.
[0016] In summary, the present application includes the following beneficial technical effects: the roadbed of the new road surface extends to one side of the old roadbed, making the overall structure more consistent. The force generated when vehicles pass is not only applied to one side of the new section, but also transmitted to the old road surface structure; at the same time, the sinking groove and rib holes are also used to increase the difficulty of transverse tearing of the new and old road surfaces. Description of the Drawings
[0017] Figure 1 is a schematic diagram of the overall structure of the present application;
[0018] Figure 2 is a schematic diagram of the partial structure of the present application;
[0019] Figure 3 is a schematic diagram of the structure of the anchor strut of the present application.
[0020] Description of the reference numerals: 1, the first soft soil roadbed layer; 2, the second soft soil roadbed layer; 3, the first concrete roadbed layer; 31, pile holes; 41, sinking grooves; 42, rib holes; 5, vertical ribs; 6, the second concrete roadbed layer; 61, grooves; 62, drain pipes; 7, steel bars; 8, anchor struts; 81, end blocks; 9, pre-buried rods; 91, lifting sleeves; 92, pressing blocks; 921, clamping grooves. Detailed Embodiments
[0021] The following will further describe the present application in detail Figures 1-3 with reference to the attached drawings.
[0022] The embodiment of the present application discloses a municipal roadbed splicing structure.
[0023] Referring to Figures 1-3 , the municipal roadbed splicing structure includes a first soft soil roadbed layer 1, a second soft soil roadbed layer 2, and a first concrete roadbed layer 3. Among them, the first soft soil roadbed layer 1 and the first concrete roadbed layer 3 are the structures of the old section, and the first concrete roadbed layer 3 is poured on the upper part of the first soft soil roadbed layer 1.
[0024] It should be noted that in this application, the road structure is obtained by laying an asphalt pavement or other concrete pavements (such as permeable pavements) on the basic concrete.
[0025] The soft soil roadbed layer 2 is a new road section structural layer obtained by re-excavating on the side of the old road, paving graded stones / soil, and repeatedly ramming. Since the old road section has been compacted to a relatively high degree after years of vehicle and pedestrian traffic compared to the new road section area, in this embodiment, the height of the soft soil roadbed layer 2 is designed to be slightly higher than that of the soft soil roadbed layer 1, for example, about 30 mm; at the same time, this design is also to prevent the change in compactness after the lateral pressure release of the soft soil structure in the old road section when excavating the new roadbed.
[0026] On one side of the concrete ground base layer 1 close to the soft soil roadbed layer 2, multiple levels of steps are opened; it should be noted that in this embodiment, the step surface does not need to be designed as an inclined surface, that is, it is not necessary to make the inner side of the step surface higher than the outer side or the outer side higher than the inner side, thereby effectively reducing the construction difficulty of cutting out the steps. The steps can be two-level, three-level or four-level, and the step surface is roughened to form a roughened surface to increase the connection strength after connection and splicing.
[0027] The widths of the above-mentioned multiple steps are different to make it more difficult to tear after the new and old roadbeds are spliced.
[0028] A number of sinking grooves 41 and reinforcement holes 42 are evenly opened on the steps. Among them, the sinking groove 41 can be a groove structure that is circular or rectangular in top view, and the depth should not be greater than 3 / 4 of the thickness of the concrete ground base layer 1. The reinforcement hole 42 is prohibited from penetrating the concrete ground base layer 1, and a vertical reinforcement 5 is placed inside it. The diameter of the vertical reinforcement 5 is smaller than that of the reinforcement hole 42 and it extends upward out of the reinforcement hole 42.
[0029] The vertical reinforcement 5 has two structural designs. The first is a single steel bar; the second is a small steel cage; if it is a single steel bar, in order to make the vertical reinforcement 5 stand in the reinforcement hole 42, a plurality of horizontal iron wires are fixed at the lower end of the vertical reinforcement 5. The iron wires are in an L shape and the vertical section is close to the hole wall of the reinforcement hole 42.
[0030] A concrete ground base layer 2 6 is poured on the soft soil roadbed layer 2, and the concrete ground base layer 2 6 extends to the steps. It can be understood that the concrete will also spread into the sinking grooves 41 and the reinforcement holes 42.
[0031] According to the above settings, this application extends the roadbed of the new road surface to one side of the old roadbed, making the overall structure more consistent. The force generated when vehicles and the like pass does not only act on the new road section side, but is also transmitted to the old road surface structure; at the same time, the sinking grooves 41 and the reinforcement holes 42 are also used to increase the difficulty of transverse tearing of the new and old road surfaces.
[0032] Before pouring the concrete ground base layer 2 6 in the above construction, the steps can be wetted first.
[0033] In an embodiment of the present application, a plurality of grooves 61 extending in the width direction are formed in the upper part of the concrete subgrade two 6. The depth of the grooves 61 is relatively small, preferably less than 50 mm. A drain pipe 62 is placed in the grooves 61. The drain pipe 62 is hidden in the grooves 61 and has a hollow structure. It can be a plastic steel mesh cage or a fine steel bar cage structure. One end of the drain pipe 62 extends out of the side of the road.
[0034] During the above construction process, it is necessary to insert a wooden rod into the drain pipe 62 in advance, and the outer wall of the wooden rod is wrapped with a plastic film or coated with a release agent. After the concrete pouring is completed, the wooden rod can be pulled out.
[0035] The above structure is set to laterally discharge some of the rainwater that penetrates downward from the road surface. Especially in the early stage after the construction of the new and old roads is completed, after the new section has been used for a period of time and the base is stable, the impact of lateral drainage blockage is relatively small.
[0036] The above groove size and the position design of the drain pipe 62 can reduce the probability of the road surface cracking after being compressed.
[0037] In an embodiment of the present application, a flexible contact layer is arranged on the inner wall surrounding the sunken groove 41. The flexible contact layer can be composed of geotextile or compacted soil; if it is geotextile, sand, gravel and soil can be sandwiched between multiple layers of geotextile; the thickness of the flexible contact layer is less than 15 mm.
[0038] The purpose of the above setting is to prevent the concrete from directly contacting the wall of the sunken groove 41, and to reduce the probability of excessive lateral tearing force caused by the drying shrinkage of the concrete and causing the upper structure to tear.
[0039] Furthermore, a plurality of steel bars 7 penetrate through the wall of the sunken groove 41; during construction, holes are drilled in the wall of the groove in advance, and then the steel bars 7 can be inserted. The setting of the steel bars 7 is beneficial to making the concrete structure in the sunken groove 41 stronger and strengthening the connection strength with the steps.
[0040] In an embodiment of the present application, it is verified that due to the difference in the water seepage capacity of the new and old roads during different usage times, water accumulation is formed in the area of the sunken groove 41, especially in the flexible layer part, resulting in a longer drying time and a longer soaking time for the steel bars 7, etc. Therefore, in this embodiment, the sunken groove 41 is set to have a convex bottom.
[0041] In an embodiment of the present application, a plurality of pile holes 31 are formed in the soft soil subgrade two 2. Steel reinforcement cages are placed in the pile holes 31, and anchor struts 8 are formed by pouring concrete; the anchor struts 8 are pre-cast, and then the concrete subgrade two 6 is poured. The upper part of the anchor struts 8 extends out of the pile holes 31 and is later cast and fixed in the concrete subgrade two 6.
[0042] The anchoring strut 8 can be used to further enhance the anti-fluidity of the new road section; meanwhile, it can also provide a certain supporting effect.
[0043] In another embodiment of the present application, one end of the anchoring strut 8 extending out of the pile hole laterally extends to form an end block 81, and the end block 81 does not contact the soft soil roadbed II 2, that is, it is separated from the soft soil roadbed II 2.
[0044] When the end block 81 is poured, a pre-buried rod 9 is buried therein, and the pre-buried rod 9 extends downward out of the end block 81; the pre-buried rod 9 can be a solid metal rod and a threaded structure is provided at the lower end. A lifting sleeve 91 is threadedly connected to the lower end of the pre-buried rod 9, and a pressing block 92 is rotatably connected to the lower end of the lifting sleeve 91. A card slot 921 is formed by the upward depression of the pressing block 92.
[0045] It can be understood that in order to make the structure of the concrete roadbed II 6 stronger, etc., a steel mesh and a civil engineering grid mesh will be laid on the soft soil roadbed II 2, and then concrete will be paved; based on the above settings, the lifting sleeve 91 can be rotated to drive the pressing block 92 to descend, and then steel bars, etc. can be inserted into the card slot 921, that is, the steel mesh and the civil engineering grid mesh can be fixed by the cooperation of the pre-buried rod 9, the lifting sleeve 91 and the anchoring strut 8 to prevent them from shifting during the concrete vibration and paving process and affecting the construction quality.
[0046] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A municipal road subgrade splicing structure, characterized in that: It comprises a soft soil road base layer 1 (1), a soft soil road base layer 2 (2) and a concrete base layer, wherein the soft soil road base layer 1 (1) and the concrete base layer 1 (3) are the structural layers of the old road section, and the soft soil road base layer 2 (2) is the structural layer of the new road section obtained by compaction; The concrete base layer 1 (3) is poured on the upper part of the soft soil road base layer 1 (1) and is used for paving the asphalt / concrete surface layer; The concrete base layer 1 (3) is provided with a plurality of steps on one side of the road base layer 2 near the soft soil, the widths of the plurality of steps being different and the step surfaces being roughened; the steps are provided with a plurality of sinking grooves (41) and reinforcement holes (42), and the reinforcement holes (42) are provided with vertical reinforcements (5) extending upward from the reinforcement holes (42); A second concrete subgrade layer (6) is poured on the second soft soil subgrade layer (2), and the second concrete subgrade layer (6) extends to the steps; A plurality of grooves (61) extending in the width direction are provided on the upper part of the second concrete foundation layer (6), and a drainage pipe (62) is placed in the groove (61). The drainage pipe (62) is hidden in the groove (61) and has a hollow structure, and one end of the drainage pipe (62) extends out of the side of the road.
2. The municipal roadbed splicing structure according to claim 1 is characterized in that: A flexible contact layer is arranged around the inner wall of the sinking groove (41).
3. The municipal roadbed splicing structure according to claim 1 is characterized in that: A plurality of steel bars (7) penetrate through the wall of the sinking trough (41).
4. The municipal roadbed splicing structure according to claim 1 is characterized in that: The bottom of the sinking groove (41) protrudes upward.
5. The municipal roadbed splicing structure according to claim 1 is characterized in that: The second soft soil roadbed layer (2) is provided with a plurality of pile holes (31), anchoring pillars (8) are arranged in the pile holes (31), and the anchoring pillars (8) extend out of the pile holes (31).
6. The municipal roadbed splicing structure according to claim 5 is characterized in that: One end of the anchoring pillar (8) extending out of the pile hole (31) extends laterally to form an end block (81), the end block (81) is separated from the second soft soil roadbed layer (2), an embedded rod (9) is arranged inside the end block (81), the embedded rod (9) extends downward out of the end block (81), an outer section of the embedded rod (9) is threadedly connected to a lifting sleeve (91), the lower end of the lifting sleeve (91) is rotatably connected to a pressing block (92), and the pressing block (92) is recessed upward to form a clamping groove (921).