A municipal road subgrade widening cantilever support structure

Abstract

This invention discloses a cantilever support structure for widening the subgrade of a municipal road, comprising a plurality of steel pipe piles arranged longitudinally along the urban road. The steel pipe piles are vertically installed with their bottom ends extending into a stable stratum. The steel pipe piles support a support beam, which in turn supports a reinforced concrete cantilever structure. Anchor steel bars are provided between the cantilever structure and the support beam. The cantilever of the cantilever structure is located on the side away from the existing subgrade. The top surface of the cantilever structure is entirely or partially the widened subgrade, which is connected to the existing subgrade. The urban road is equipped with a drainage system. This structure not only widens the subgrade of the municipal road but also avoids affecting the safety and stability of the outer structures due to the widening of the subgrade.

Description

Technical Field

[0001] This invention relates to the field of widening the subgrade of municipal roads, and in particular to a cantilever support structure for widening the subgrade of municipal roads. Background Technology

[0002] With the rapid development of urban construction, there are many old road renovation or new municipal road construction projects in towns and cities. However, the widening of old roads or the construction of new roads are often restricted by existing buildings, and the roadbed cannot be naturally sloped or supported. Therefore, special design for widening the roadbed is particularly necessary in restricted road sections.

[0003] Currently, traditional methods for widening roadbeds include gravity retaining walls and pile-slab walls. However, in widening existing roads or constructing new roads where restrictions are imposed by buildings, traditional retaining structures have the following drawbacks: First, gravity retaining walls have large cross-sections, require significant masonry work, and involve substantial foundation excavation. Excavation of the retaining wall foundation pit affects the safety of the foundations of buildings on both sides, while the large amount of masonry work and the self-weight of the retaining wall compressing the structure at the base of the wall threaten its safety. Furthermore, retaining walls have high requirements for foundation bearing capacity and geological conditions, and their appearance after construction is poor, thus significantly limiting their use. Second, manual excavation for pile-slab walls carries high safety risks, and the buildings on both sides are prone to deformation and settlement during construction, resulting in higher costs. In view of these shortcomings of traditional retaining methods, special designs are needed for roadbed widening in sections with restrictions on both sides. These designs aim to increase the stability of the roadbed itself while minimizing the impact on important buildings on both sides. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a cantilever support structure for widening the roadbed of municipal roads, so as to solve the problem of restricted roadbed widening on both sides of municipal roads.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A cantilever support structure for widening the subgrade of a municipal road includes several steel pipe piles arranged longitudinally along the urban road. The steel pipe piles are vertically installed with their bottom ends extending into a stable stratum. The steel pipe piles support a support beam, which in turn supports a reinforced concrete cantilever structure. An anchoring steel bar is provided between the cantilever structure and the support beam. The cantilever of the cantilever structure is located on the side away from the existing subgrade. The top surface of the cantilever structure is wholly or partially the widened subgrade, which is connected to the existing subgrade. The urban road is equipped with a drainage system.

[0007] Furthermore, the supporting part of the cantilever structure is located on the support beam and is connected to the support beam by an anchoring steel bar. The lower part of the supporting part of the cantilever structure away from the existing roadbed has a notch, and a concrete pad is provided in the notch. The concrete pad is connected to the cantilever structure by an anchoring steel bar.

[0008] Furthermore, the supporting part of the cantilever structure is located on the support beam and is connected to the support beam by an anchor steel bar. The supporting part of the cantilever structure has a notch 2 on the upper part of the side facing the existing roadbed, and the existing roadbed extends into the notch 2.

[0009] Furthermore, the bottom surface of the cantilever structure gradually slopes upward from the supporting part of the cantilever structure.

[0010] Furthermore, the drainage system includes drainage ditches arranged longitudinally along the urban road to collect road surface water. The drainage ditches are located near the cantilever structure of the existing roadbed, and the drainage ditches are connected to the stormwater and sewage system through drainage pipes.

[0011] Furthermore, the drainage pipeline includes several water collection pipes, longitudinal drainage pipes, and several vertical drainage pipes. The longitudinal drainage pipes are arranged longitudinally along the urban road under the cantilever of the cantilever structure. Several water collection pipes are spaced apart on the cantilever structure and their two ends are respectively connected to the drainage ditch and the longitudinal drainage pipes. The longitudinal drainage pipes are connected to the rainwater and sewage system by several vertical drainage pipes arranged at intervals.

[0012] Furthermore, the longitudinal drainage pipe is suspended and fixed to the cantilever structure by a number of spaced-apart rods.

[0013] Furthermore, a crash barrier is installed on the side of the widened roadbed that faces away from the existing roadbed.

[0014] The beneficial effects of this invention are:

[0015] This invention discloses a cantilevered support structure for widening the subgrade of municipal roads. The cantilevered structure is supported by steel pipe piles located near or beneath the existing subgrade. The cantilever is positioned on the side away from the existing subgrade, and the top surface of the cantilever structure is entirely or partially part of the widened subgrade. This effectively widens the subgrade while preventing the widening from affecting the safety and stability of external structures. Grouting using the steel pipe piles addresses the foundation bearing capacity requirements of the cantilever structure and effectively avoids the squeezing effect of subgrade filling on the foundations of external structures. The cantilever structure forms an integral support barrier, ensuring the overall stability of the subgrade. This invention features a simple structure, easy construction, minimal interference with external buildings, and minimal impact on building foundations. It can significantly reduce demolition costs and construction costs in municipal road projects.

[0016] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained from the following description and claims. Attached Figure Description

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the layout of the invention on the cross-section of a municipal roadbed.

[0019] Figure 2 for Figure 1 Schematic diagram of the layout of the cantilever structure and drainage system.

[0020] Figure 3 for Figure 1 A schematic diagram of the arrangement of steel pipe piles and concrete pads.

[0021] Figure 4 for Figure 1 Schematic diagram of the steel cage cross-section of the cantilever structure. Detailed Implementation

[0022] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0023] like Figure 1-4 As shown, a cantilever support structure for widening the subgrade of a municipal road includes several steel pipe piles 4 arranged longitudinally along the urban road. The steel pipe piles 4 are vertically installed with their bottom ends extending into the stable stratum. The length of the steel pipe piles is adjusted according to the depth of the stable stratum, which can improve the foundation bearing capacity of the cantilever structure and ensure the overall stability of the widened subgrade 5. The steel pipe piles 4 support the support beam 3, and the support beam 3 supports the reinforced concrete cantilever structure 1. Anchor steel bars 7 are provided between the cantilever structure 1 and the support beam 3 to make the connection between the cantilever structure and the support beam more solid and the structure safer. The anchor steel bars 7 are pre-embedded in the support beam 3. The cantilever of the cantilever structure 1 is located on the side away from the existing subgrade 14. The top surface of the cantilever structure 1 is wholly or partially the widened subgrade 5, which is connected to the existing subgrade 14. The urban road is equipped with a drainage system.

[0024] The use of cantilever structures effectively solves the problem of roadbed constraints on both sides of municipal roads, avoids the impact of roadbed widening on existing buildings on both sides, and solves the foundation bearing capacity of cantilever structures by using steel pipe pile grouting. The combined effect of cantilever structures and steel pipe piles ensures the overall stability of the roadbed.

[0025] The supporting part of the cantilever structure 1 is located on the support beam 3 and is connected to the support beam 3 by anchor steel bar 7. The supporting part of the cantilever structure 1 has a notch 1 at the bottom of the side away from the existing roadbed 14. A concrete pad 2 is provided in the notch 1. The concrete pad 2 is connected to the cantilever structure 1 by anchor steel bar 8. The anchor steel bar 8 makes the connection between the cantilever structure and the concrete pad more firm and the structure safer. The concrete pad 2 is cast-in-place concrete. The anchor steel bar 8 is embedded in the concrete pad 2. The purpose of setting the concrete pad 2 is to prevent the cantilever structure 1 from overturning to the side away from the existing roadbed when the load on the cantilever of the cantilever structure 1 is too large.

[0026] The supporting part of the cantilever structure 1 is located on the support beam 3 and is connected to the support beam 3 by the anchor steel bar 7. The supporting part of the cantilever structure 1 has a notch 2 on the upper part of the side facing the existing roadbed 14. The existing roadbed 14 extends into the notch 2, which can further prevent the cantilever structure 1 from overturning away from the existing roadbed when the load on the cantilever of the cantilever structure 1 is too large, thus fully ensuring the stability of the supporting structure.

[0027] The bottom surface of the cantilever of the cantilever structure 1 gradually slopes upward from the supporting part of the cantilever structure 1, so that the cantilever of the cantilever structure has the least impact on the foundation of the roadside building.

[0028] The drainage system includes drainage ditches arranged longitudinally along the urban road to collect road surface water. The drainage ditches are located near the existing roadbed 14 and adjacent to the cantilever structure 1. The drainage ditches are connected to the stormwater and sewage system through drainage pipes. Road surface water does not pass through the cantilever structure, which can prevent the cantilever structure from being submerged in water for a long time and affecting its service life.

[0029] The drainage pipeline includes several water collection pipes 9, longitudinal drainage pipes 10, and several vertical drainage pipes 11. The longitudinal drainage pipes 10 are arranged longitudinally along the urban road under the cantilever of the cantilever structure 1. Several water collection pipes 9 are spaced apart on the cantilever structure 1 and their two ends are connected to the drainage ditch and the longitudinal drainage pipes 10, respectively. The longitudinal drainage pipes 10 are connected to the stormwater and sewage system by several vertical drainage pipes 11 arranged at intervals. The existing roadbed uses water collection pipes 9 to cross the cantilever structure 1 and connect the longitudinal drainage pipes 10 and the vertical drainage pipes 11 to complete the centralized collection and discharge of road surface water or road surface sewage into the stormwater and sewage system, reduce environmental pollution, reduce stormwater and sewage erosion of temporary structures, have basically no impact on nearby residential areas, and are more friendly to the surrounding environment.

[0030] The longitudinal drainage pipe 10 is suspended and fixed to the cantilever structure 1 by a number of spaced-apart hangers 12, which ensures the stability of the longitudinal drainage pipe.

[0031] The widened roadbed 5 is separated from the existing roadbed 14 by a crash barrier 6 to ensure driving safety.

[0032] The reinforcing steel bars 13 of the cantilever structure 1 are determined based on vehicle load calculations. The cantilever structure bears variable loads such as vehicle loads and pedestrian loads. The reinforcing steel bars are arranged in the cantilever structure to ensure the safety and reliability of the structure under the action of variable loads.

[0033] The cantilever structure in this support structure not only widens the roadbed of the municipal road, but also avoids affecting the safety and stability of the outer structures due to the roadbed widening. It has little interference with the outer buildings and little impact on the building foundations. The rainwater and sewage collection system can reduce erosion of nearby buildings. The invention has a simple structure, is easy to construct, and reduces construction costs.

[0034] A method for implementing a cantilever support structure for widening the subgrade of municipal roads includes the following steps:

[0035] a. Implement steel pipe piles in sections using mechanical drilling, insert reinforcing bars inside the steel pipe piles to increase their shear resistance, and conduct grouting test piles on site;

[0036] b. Cast a reinforced concrete support beam 3 on the top of the steel pipe pile 1. The top of the steel pipe pile 1 extends into the support beam 3 by no less than 50cm. Anchor bars 7 are pre-embedded in the support beam 3 during the concrete pouring.

[0037] c. Cast concrete pad 2 on the support beam 3, and pre-embed anchor bars 8 during the casting of concrete pad 2;

[0038] d. Construct a steel cage for cantilever structure 1 on the support beam 3 and concrete pad 2, place the reinforcing steel bars 13 in the steel cage for cantilever structure 1, insert the anchoring steel bars 7 and 8 of step c into the steel cage for cantilever structure 1, pour concrete in place, and cast the anchoring steel bars 7 and 8 together with cantilever structure 1.

[0039] e. In step d, the hanger 12 is fixed to the cantilever structure 1 by the embedded parts. At the same time, a PVC pipe is used to reserve a water collection pipe 9 channel. The longitudinal drainage pipe 10 is erected on the hanger 12 and connected to the water collection pipe 9. The vertical drainage pipe 11 is laid out according to the spacing requirements and connected to the longitudinal drainage pipe 10.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A cantilever support structure for widening the subgrade of a municipal road, characterized in that: The system includes several steel pipe piles (4) arranged longitudinally along the urban road. The steel pipe piles (4) are vertically set and their bottom ends extend into the stable stratum. The steel pipe piles (4) support the support beams (3). The support beams (3) support the cantilever structure (1) made of reinforced concrete. Anchor bars (7) are provided between the cantilever structure (1) and the support beams (3). The cantilever of the cantilever structure (1) is located on the side away from the existing roadbed (14). The top surface of the cantilever structure (1) is entirely or partially a widened roadbed (5). The widened roadbed (5) is connected to the existing roadbed (14). The urban road is equipped with a drainage system. The supporting part of the cantilever structure (1) is located on the support beam (3) and is connected to the support beam (3) by an anchor steel bar (7). The supporting part of the cantilever structure (1) has a gap one on the side away from the existing roadbed (14). A concrete pad (2) is provided in the gap one. The concrete pad (2) is connected to the cantilever structure (1) by an anchor steel bar (8). The drainage system includes drainage ditches arranged longitudinally along the urban road to collect road surface water. The drainage ditches are located near the cantilever structure (1) of the existing roadbed (14). The drainage ditches are connected to the stormwater and sewage system through drainage pipes.

2. The cantilever support structure for widening the subgrade of a municipal road according to claim 1, characterized in that: The supporting part of the cantilever structure (1) is located on the support beam (3) and is connected to the support beam (3) by an anchor steel bar (7). The supporting part of the cantilever structure (1) has a gap two on the upper part of the side facing the existing roadbed (14), and the existing roadbed (14) extends into the gap two.

3. The cantilever support structure for widening the subgrade of a municipal road according to claim 1, characterized in that: The cantilever bottom surface of the cantilever structure (1) gradually slopes upward from the supporting part of the cantilever structure (1).

4. The cantilever support structure for widening the subgrade of a municipal road according to claim 1, characterized in that: The drainage pipeline includes several water collection pipes (9), longitudinal drainage pipes (10) and several vertical drainage pipes (11). The longitudinal drainage pipes (10) are arranged longitudinally along the urban road under the cantilever of the cantilever structure (1). Several water collection pipes (9) are spaced apart on the cantilever structure (1) and their two ends are connected to the drainage ditch and the longitudinal drainage pipes (10) respectively. The longitudinal drainage pipes (10) are connected to the rainwater and sewage system by several vertical drainage pipes (11) arranged at intervals.

5. The cantilever support structure for widening the subgrade of a municipal road according to claim 4, characterized in that: The longitudinal drainage pipe (10) is suspended and fixed to the cantilever structure (1) by a number of spaced-apart hangers (12).

6. A cantilever support structure for widening the subgrade of a municipal road according to any one of claims 1-5, characterized in that: The widened roadbed (5) is equipped with a crash barrier (6) on the side away from the existing roadbed (14).

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