Repair structure for subsidence diseases of cement concrete pavement
By drilling and grouting in the subsided sections of cement concrete pavement, inserting anti-settlement tie rods and steel bars, and combining them with specific concrete materials to form a repair layer, the problem of cement concrete pavement subsidence was solved, achieving efficient and economical repair results and enhancing the stability and crack resistance of the roadbed.
Patent Information
- Application Number
- CN202520231939.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-02-13
AI Technical Summary
Cement concrete pavements are prone to subsidence under long-term loads and environmental factors. Traditional repair methods have long construction cycles, high costs, and are prone to generating new cracks. Unstable roadbeds and improper treatment of joints are also important reasons.
In the settlement section, boreholes are drilled and polymer grouting is poured to form a roadbed reinforcement layer. Anti-settlement tie rods and edge reinforcing bars are implanted. A leveling and surface repair layer is formed by combining C20 self-compacting concrete and C35 high-performance elastic concrete. Transverse expansion joints are set and filled with asphalt paste.
It improves the bearing capacity and stability of the roadbed, reduces repair time and material consumption, lowers costs, prevents moisture from entering the road base layer, reduces the risk of new cracks, and enhances overall stability and harmony.
Smart Images
Figure CN223793442U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to road engineering technical field, concretely relates to a cement concrete pavement subsidence disease's repair structure. BACKGROUND
[0002] Cement concrete pavement is easy to appear subsidence under the action of long -term load and environmental factor, influences the driving safety and the comfort. The traditional repair method such as re -paving or local repair often has the problems such as long construction period, high cost and new crack is easy to produce in joint after repair. In addition, the instability of roadbed, improper treatment of pavement lap joint are also important reasons leading to pavement subsidence. SUMMARY
[0003] To solve the problems in the prior art mentioned above, the utility model provides a cement concrete pavement subsidence disease's repair structure.
[0004] A cement concrete pavement subsidence disease's repair structure, characterized by: including roadbed reinforcement layer, leveling layer and surface repair layer, a plurality of drill holes are drilled on the road base layer of settlement section, the drill hole depth is deep into the stable soil layer or bedrock surface, polymer grouting is poured in the drill hole, the roadbed reinforcement layer is formed under the roadbed layer, the cut joint at the junction of normal section and settlement section is removed, the removal joint width is 500mm-1000mm, the anti-settling drawbar is implanted in the longitudinal drill hole in the normal section, the transverse expansion joint is formed at the junction of settlement section and normal section, and the asphalt oil paste is filled in the transverse expansion joint, the edge reinforcing steel bar is arranged 20cm away from the transverse expansion joint, the C20 self-compacting concrete is laid on the settlement layer to keep consistent with the surrounding normal section, the leveling layer is formed, and the C35 high-performance elastic concrete material is poured on the leveling layer to form the surface repair layer.
[0005] Further, the C20 self-compacting concrete includes rubber particles, stone, natural sand, water, cement and water reducing agent.
[0006] Further, the edge reinforcing steel bar includes 4 φ14 main bars and φ10 stirrups, the main bar adopts screw steel bar, and the interval is 150mm; the stirrup adopts bright round steel bar, and the interval is 200mm.
[0007] Further, the drill hole diameter is 50-150mm, the drill hole depth is greater than 1.5 times of the hole diameter, the drill hole adopts plum blossom shape arrangement, and the drill hole interval is 1500-3000mm.
[0008] Furthermore, the anti-settlement tie rod is a threaded steel tie rod with a diameter of φ14. The gap between the anti-settlement tie rod and the drill hole is fixed with anchoring adhesive. The anti-settlement tie rod is 700mm long, with 350mm embedded in the non-settled section of the road surface. The other end is within the range of the reinforcing steel bar, and the anti-settlement tie rod is spaced 600mm apart.
[0009] The beneficial effects of this utility model are as follows: the roadbed reinforcement layer can improve the bearing capacity and stability of the roadbed. Furthermore, compared to the traditional method of completely replacing the road surface and roadbed of a subsided section with new road construction, it saves road repair time and road construction material consumption, reducing repair costs. Filling the transverse expansion joints with asphalt sealant prevents water from entering the road base and roadbed, thus preventing water damage. The installation of a roadbed reinforcement layer, along with anti-settlement tie rods and edge reinforcement bars, improves the overall stability and coordination between the repair structure and the original road surface, reducing the risk of new cracks forming at the joints. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the longitudinal section of a repair structure for subsidence damage on cement concrete pavement.
[0011] Figure 2 This is a partial longitudinal section schematic diagram of a repair structure for subsidence of cement concrete pavement.
[0012] Among them: 1-Surface repair layer, 2-Leveling layer, 3-Settlement layer, 4-Road base layer, 5-Subgrade reinforcement layer, 6-Cut joint, 7-Anti-settlement tie rod, 8-Transverse expansion joint, 9-Edge reinforcement steel bar, 10-Normal section, 11-Settlement section. Detailed Implementation
[0013] Example 1: A repair structure for subsidence of cement concrete pavement includes a subgrade reinforcement layer 5, a leveling layer 2, and a surface repair layer 1. Several boreholes are drilled in the road base layer of the subsided section, with the borehole depth reaching the stable soil layer or bedrock surface. The borehole diameter is 50-150 mm, and the borehole depth is greater than 1.5 times the borehole diameter. The boreholes are arranged in a staggered pattern with a spacing of 1500 meters. Polymer grout is poured into the boreholes to form the subgrade reinforcement layer 5 below the road base layer. At the junction of normal section 10 and settlement section 11, the joint 6 is vertically cut and removed, with a removal width of 500mm-1000mm. A longitudinal hole is drilled in normal section 10, and anti-settlement tie rods 7 are inserted. The anti-settlement tie rods 7 are threaded steel rods with a diameter of φ14. The gap between the anti-settlement tie rods 7 and the drilled hole is fixed with anchoring adhesive. The length of the anti-settlement tie rods 7 is 700mm, with 350mm inserted into the normal section pavement. The other end is within the reinforcing steel reinforcement area. The anti-settlement tie rods are spaced 600mm apart. A transverse expansion joint 8 is formed at the junction of settlement section 11 and normal section, and asphalt sealant is filled into the transverse expansion joint 8. Edge reinforcing steel bars 9 are installed 20cm away from the transverse expansion joint 8. The edge reinforcing steel bars include four φ14 main bars and φ10 stirrups. The main bars are threaded steel bars with a spacing of 150mm; the stirrups are plain round steel bars with a spacing of 200mm. C20 self-compacting concrete is laid on the settlement layer 3 until it is level with the surrounding normal section 10, forming the leveling layer 2. The C20 self-compacting concrete is made of rubber particles, aggregate, natural sand, water, cement and water-reducing agent. C35 high-performance elastic concrete is poured on top of the leveling layer 2 to form the surface repair layer 1.
Claims
1. A repair structure for subsidence damage in cement concrete pavements, characterized in that: The process includes a roadbed reinforcement layer, a leveling layer, and a surface repair layer. Several boreholes are drilled into the road base layer of the settlement section, reaching the stable soil layer or bedrock surface. Polymer grout is poured into the boreholes to form a roadbed reinforcement layer below the road base layer. The joints at the junction of the normal section and the settlement section are removed, with a removal width of 500mm-1000mm. Longitudinal holes are drilled in the normal section and anti-settlement tie rods are inserted. A transverse expansion joint is formed at the junction of the settlement section and the normal section, and asphalt mastic is filled into the transverse expansion joint. Edge reinforcement bars are installed 20cm away from the transverse expansion joint. C20 self-compacting concrete is laid on the settlement layer until it is level with the surrounding normal section to form a leveling layer. C35 high-performance elastic concrete is poured on top of the leveling layer to form a surface repair layer.
2. The repair structure for cement concrete pavement subsidence as described in claim 1, characterized in that... The C20 self-compacting concrete comprises rubber particles, aggregates, natural sand, water, cement, and a water-reducing agent.
3. The repair structure for cement concrete pavement subsidence as described in claim 1, characterized in that... The edge reinforcing bars include four φ14 main bars and φ10 stirrups. The main bars are made of threaded steel bars with a spacing of 150mm; the stirrups are made of plain round steel bars with a spacing of 200mm.
4. The repair structure for subsidence of cement concrete pavement as described in claim 1, characterized in that... The borehole diameter is 50-150mm, the borehole depth is greater than 1.5 times the borehole diameter, the boreholes are arranged in a quincunx pattern, and the borehole spacing is 1500-3000mm.
5. The repair structure for subsidence of cement concrete pavement as described in claim 1, characterized in that... The anti-settlement tie rod is a threaded steel tie rod with a diameter of φ14. The gap between the anti-settlement tie rod and the drill hole is fixed with anchoring glue. The anti-settlement tie rod is 700mm long, with 350mm embedded in the non-settled section of the road surface. The other end is within the range of the reinforcing steel bar. The anti-settlement tie rod is arranged at intervals of 600mm.