Bridge abutment back soft soil section roadbed settlement control box culvert structure

Abstract

The utility model relates to a bridge abutment back soft soil section roadbed settlement control box culvert structure which comprises a plurality of CFG piles arranged on a bridge abutment back soft soil section roadbed, a plurality of sections of box culvert structures are sequentially poured on the upper sides of the CFG piles, and a settlement joint is arranged between every two adjacent box culvert structures. The box culvert structure close to the bridge abutment is provided with an upper structure connected with the bridge abutment. The box culvert structure can be well connected with the abutment back of the bridge abutment, and the settlement amplitude difference between the abutment back of the bridge abutment and a roadbed is reduced.

Description

Technical Field

[0001] The utility model relates to a culvert structure for controlling the settlement of the subgrade in the soft soil section of the abutment back Background Art

[0002] It is a common problem that uneven settlement occurs at the joint between the road surface and the abutment back. The abutment usually adopts a foundation form with greater stiffness and basically does not settle, while the stiffness of the subgrade section of the abutment back is smaller, which leads to uneven settlement at the joint between the abutment back and the road surface. Excessive settlement amplitude of the subgrade of the abutment back will cause phenomena such as bump at the bridge head and cracks in the beam body. Therefore, it is particularly important to control the settlement amplitude of the subgrade of the abutment back

[0003] At present, the methods for settlement control mainly include soil replacement and load reduction of the subgrade soil and foundation treatment. Foundation treatment mainly improves the bearing capacity of the soft foundation by laying piles, etc.; soil replacement and load reduction mainly replace the backfill soil of the subgrade with new materials such as aerated light soil with lighter specific gravity to reduce the load of the overlying subgrade on the foundation. At present, the aerated light soil commonly used as the replacement material has problems such as low strength and poor performance stability; while a large number of dense pile treatments have problems such as high economic cost and long construction period Content of the Utility Model

[0004] The purpose of the utility model is to provide a culvert structure for controlling the settlement of the subgrade in the soft soil section of the abutment back, which can be well connected with the abutment back and reduce the settlement amplitude difference between the abutment back and the subgrade

[0005] The technical solution of the utility model lies in: a culvert structure for controlling the settlement of the subgrade in the soft soil section of the abutment back, including several CFG piles arranged in the soft soil section of the abutment back subgrade. Several sections of culvert structures are sequentially poured on the upper side of the CFG piles. A settlement joint is arranged between adjacent two culvert structures. The culvert structure close to the abutment is provided with an upper structure connected with the abutment

[0006] Furthermore, a cushion layer is laid on the bottom surface of the culvert structure, a drain pipe is laid under the culvert structure, and a bridging slab, a cast-in-place layer and asphalt concrete are sequentially arranged on the top surface of the culvert structure

[0007] Furthermore, a waterproof agent is smeared on the outer surface of the culvert structure

[0008] Furthermore, concrete anti-collision railings are arranged on both sides of the upper end of the culvert structure

[0009] Furthermore, a PE lining plate is placed in the settlement joint. A center - type steel - edged rubber waterstop with both ends extending into the culvert structure respectively is arranged in the middle of the PE lining plate. Sealing structures are arranged on both the upper and lower sides of the PE lining plate

[0010] Furthermore, the sealing structure is a two-component polysulfide sealing paste filled in the settlement joint.

[0011] Furthermore, a box girder is overlapped on the corbel of the abutment, and asphalt concrete is poured on the upper side of the box girder.

[0012] Furthermore, an expansion joint notch is provided on the upper side of the abutment and between the box girder and the upper structure of the box culvert structure, and the expansion joint notch is poured with asphalt concrete.

[0013] Furthermore, the upper structure is connected to the abutment via anti-slip material.

[0014] Furthermore, when a construction joint is left during the pouring of the concrete of the box culvert structure, the surface of the construction joint is roughened and cleaned, and tarpaulin is laid on the outside of the construction joint of the box culvert structure.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. During the construction of the box culvert structure, the box culvert structure is a reinforced concrete frame structure, which requires less building materials and can achieve the effect of reducing its own weight, thereby reducing the load transferred to the foundation and playing a role in controlling settlement. The settlement control effect is obvious.

[0017] 2. The box culvert structure has high rigidity, which is similar to the abutment rigidity, so that the bridge and the roadbed are well connected. The CFG pile foundation is used for the small section of the foundation at the connection between the abutment and the back of the abutment, which can greatly reduce the difference in settlement between the bridge and the roadbed, so that the settlement of the abutment and the back of the roadbed is reduced under the long-term vehicle load and self-weight load, avoiding the phenomenon of vehicle jumping during driving and cracks in the beam body, and at the same time improving the service life and safety of the bridge.

[0018] 3. Installing anti-slip materials on the box culvert structure can resist the slippage of the roadbed, and the slip prevention effect is significant.

[0019] 4. The box culvert structure is a reinforced concrete structure. The overall frame structure must be built with steel bars first, and then concrete is poured. After that, the concrete is cured. It only needs to cover the concrete surface with a layer of plastic film and cure it under standard conditions for a specified time. The box culvert structure can be completed, and the curing method is simple. At the same time, the cost of reinforced concrete is much lower than that of materials such as bubble lightweight soil, which can play a role in low economic cost.

[0020] 5. The box culvert structure is selected as the main structure. A drainage pipe is set at the bottom of the box culvert structure to drain the water well and prevent excessive accumulation of water from becoming wastewater and corroding the box culvert structure, so as to achieve good durability.

[0021] 6. Green plants can be planted in the grooves of the concrete anti-collision railing, which can play a role in protecting the environment and beautifying the road. Description of the Drawings

[0022] Figure 1 The following is the rear elevation schematic diagram of the abutment back roadbed box culvert structure of the present utility model

[0023] Figure 2 The following is the cross-sectional structure schematic diagram of the abutment back box culvert structure of the present utility model;

[0024] Figure 3 The following is the cross-sectional view of the anti-collision railing on the side of the present utility model;

[0025] Figure 4 The following is the connection schematic diagram of the back box culvert of the present utility model;

[0026] Figure 5 The following is the construction joint structure treatment diagram of the present utility model;

[0027] Figure 6 The following is the settlement joint structure treatment diagram of the present utility model;

[0028] In the figures: 1 - box culvert structure, 2 - settlement joint, 3 - CFG pile, 4 - asphalt concrete, 5 - cast-in-place layer, 6 - approach slab, 7 - box girder, 8 - cushion layer, 9 - expansion joint notch, 10 - abutment, 11 - asphalt felt, 12 - superstructure, 13 - concrete anti-collision railing, 14 - waterproofing agent, 15 - concrete roughening and cleaning, 16 - construction joint, 17 - drain pipe, 18 - two-component polysulfide sealant, 19 - PE backing plate, 20 - center-mounted steel-sided rubber waterstop, 21 - anti-slip material, 22 - groove. Detailed Implementation Manner

[0029] To make the above features and advantages of the present utility model more understandable, specific embodiments are hereinafter given and described in detail in conjunction with the accompanying drawings, but the present utility model is not limited thereto.

[0030] Reference Figures 1 to 6

[0031] A box culvert structure for controlling the settlement of the subgrade in the soft soil section of the abutment back includes a number of CFG piles 3 arranged in the subgrade of the soft soil section of the abutment back 10, and a number of box culvert structures 1 are sequentially poured on the upper side of the number of CFG piles 3. A settlement joint 2 is arranged between two adjacent box culvert structures 1, and the box culvert structure 1 close to the abutment 10 is provided with a superstructure 12 connected to the abutment 10.

[0032] In this embodiment, a cushion layer 8 is laid on the bottom surface of the box culvert structure 1, a number of drain pipes 17 are laid horizontally at intervals in the lower part of the box culvert structure 1, and an approach slab 6, a cast-in-place layer 5 and asphalt concrete 4 are sequentially arranged on the top surface of the box culvert structure 1.

[0033] In this embodiment, a waterproof agent 14 is applied to the outer surface of the box culvert structure 1.

[0034] In this embodiment, concrete anti-collision railings 13 are provided on both sides of the upper end of the box culvert structure 1. Specifically, grooves 22 can be provided on the outer side of the concrete anti-collision railings 13 so that green plants can be planted in the grooves 22 of the concrete anti-collision railings 13, playing the role of protecting the environment and beautifying the road.

[0035] In this embodiment, a PE lining plate 19 is integrally placed in the settlement joint 2. A center-mounted steel-side rubber waterstop 20 with both ends extending into the box culvert structure 1 is provided in the middle of the PE lining plate 19. Sealing structures are provided on both the upper and lower sides of the PE lining plate 19. The sealing structure is a two-component polysulfide sealant 18 filled in the settlement joint 2, thereby sealing the settlement joint and improving the waterproof effect.

[0036] In this embodiment, the bracket on the abutment 10 is lapped and fixedly connected to one end of the box girder 7, and asphalt concrete 4 is cast on the upper side of the box girder 7.

[0037] In this embodiment, an expansion joint notch 9 is provided on the upper side of the abutment 10 and between the box girder 7 and the upper structure 12 of the box culvert structure 1, and asphalt concrete 4 is cast in the expansion joint notch 9.

[0038] In this embodiment, the upper structure 12 is connected to the abutment 10 through an anti-slip material 21.

[0039] In this embodiment, when constructing the box culvert structure 1, the concrete pouring operation should be continuously carried out at one time. If there are inevitable reasons that cause the concrete pouring operation to need to be interrupted, the interruption time should be shortened as much as possible. If the interruption time exceeds the initial setting time of the concrete, it is treated as an interruption of the pouring time, and a construction joint 16 needs to be left and relevant records should be made. During the construction joint 16 structure treatment, the construction joint 16 is subjected to concrete roughening and cleaning treatment 15, and a felt 11 is laid outside the construction joint 16 of the box culvert structure 1.

[0040] The construction steps of this box culvert structure are as follows:

[0041] (1) Carry out CFG pile 3 foundation treatment, pump concrete for perfusion, while pulling out the pipe and pumping concrete at the same time until the concrete reaches the designed elevation of the pile top. Move the drilling rig, and then insert steel reinforcement cages into the drilled holes respectively. Carry out natural curing of the concrete. After the concrete at the pile top reaches the curing age, clean the soil between the piles and chisel off the pile heads.

[0042] (2)Make some necessary construction preparations and then carry out foundation treatment. Excavate the foundation pit. After excavating to the designed depth, conduct the foundation bearing capacity test. After the test meets the requirements, bind the foundation steel bars and install the foundation formwork. Inspect the joints, top positions, plane elevations, structural dimensions, etc. of the formwork. Pour the foundation concrete, bind the frame steel bars, install the frame formwork. After the inspection of the steel bars and formwork is completed, pour the frame concrete. When the concrete strength reaches more than 75% of the designed strength, remove the formwork according to the formwork removal sequence. At this time, the construction of the culvert structure 1 has been completed, and then the implementation of the ancillary project is carried out.

[0043] Among them, the construction equipment of the CFG pile 3 depends on the specific situation of the project. In areas with geological conditions containing hard soil layers, a vibrating pipe jacking machine is used for construction. In areas with soil layers with relatively high sensitivity, a spiral drill is first used for pre-drilling, and then a vibrating pipe jacking machine is used for construction. In areas with high requirements for the quality of hole formation, a long spiral drilling machine can be used for construction.

[0044] The culvert structure for controlling the settlement of the subgrade in the soft soil section of the abutment back of the utility model can be well connected with the abutment back, reducing the difference in settlement amplitude between the abutment back and the subgrade, reducing the settlement amplitude of the subgrade of the abutment back under the long-term action of vehicle load and self-weight load, avoiding the phenomenon of vehicle jumping during driving, avoiding the phenomenon of cracks in the beam body, and at the same time improving the service life and safety of the bridge.

[0045] If the utility model discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (such as using bolts or screws for connection), or it can also be understood as: a non-detachable fixed connection (such as riveting, welding). Of course, the mutually fixed connection can also be replaced by an integral structure (such as manufactured by integral forming using casting technology) (except where it is obviously impossible to adopt the integral forming process).

[0046] In addition, the terms used to represent the positional relationship or shape in any of the technical solutions disclosed in the above utility model, unless otherwise stated, include states or shapes that are approximate, similar or close to it.

[0047] Any component provided by the utility model can either be assembled from multiple separate components or be a single component manufactured by integral forming technology.

[0048] The above are only the preferred embodiments of the utility model. All equivalent changes and modifications made according to the scope of the patent application of the utility model shall fall within the scope covered by the utility model.

Claims

1. A box culvert structure for controlling roadbed settlement in soft soil section behind abutment, characterized in that: It includes a number of CFG piles set in the soft soil section of the roadbed behind the abutment. A number of box culvert structures are cast in sequence on the upper side of the CFG piles. A settlement joint is set between two adjacent box culvert structures. The box culvert structure close to the abutment is provided with an upper structure connected to the abutment.

2. The box culvert structure for controlling roadbed settlement in the soft soil section behind the abutment according to claim 1 is characterized in that: The bottom surface of the box culvert structure is paved with a cushion layer, the lower part of the box culvert structure is paved with a drainage pipe, and the top surface of the box culvert structure is sequentially arranged with a slab, a cast-in-place layer and asphalt concrete.

3. A box culvert structure for controlling roadbed settlement in soft soil section behind abutment according to claim 1 or 2, characterized in that: The outer surface of the box culvert structure is coated with a waterproofing agent.

4. A box culvert structure for controlling roadbed settlement in soft soil section behind abutment according to claim 1 or 2, characterized in that: Concrete anti-collision railings are arranged on both sides of the upper end of the box culvert structure.

5. A box culvert structure for controlling roadbed settlement in soft soil section behind abutment according to claim 1 or 2, characterized in that: A PE liner plate is placed in the settlement joint, a centrally placed steel-edged rubber waterstop strip is arranged in the middle of the PE liner plate with both ends extending into the box culvert structure respectively, and sealing structures are arranged on both upper and lower sides of the PE liner plate.

6. The box culvert structure for controlling roadbed settlement in the soft soil section behind the abutment according to claim 5 is characterized in that: The sealing structure is a two-component polysulfide sealing paste filled in the settlement joint.

7. A box culvert structure for controlling roadbed settlement in soft soil section behind abutment according to claim 1, 2 or 6, characterized in that: A box girder is overlapped on the corbel of the abutment, and asphalt concrete is poured on the upper side of the box girder.

8. The box culvert structure for controlling roadbed settlement in the soft soil section behind the abutment according to claim 7 is characterized in that: An expansion joint notch is arranged on the upper side of the abutment and between the box girder and the upper structure of the box culvert structure, and the expansion joint notch is poured with asphalt concrete.

9. A box culvert structure for controlling roadbed settlement in soft soil section behind abutment according to claim 1 or 8, characterized in that: The upper structure is connected to the abutment via anti-slip material.

10. The box culvert structure for controlling roadbed settlement in soft soil section behind abutment according to claim 1, characterized in that: When a construction joint is left during the concrete pouring of the box culvert structure, the surface of the construction joint is roughened and cleaned, and tarpaulin is laid on the outside of the construction joint of the box culvert structure.

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