Urban soft foundation expressway bottom box inverted arch concrete U-shaped groove

Abstract

The utility model belongs to the technical field of road and bridge accessory structure engineering, and particularly relates to a bottom box inverted arch concrete U-shaped groove of an urban soft foundation expressway. The bottom box inverted arch concrete U-shaped groove is composed of a U-shaped groove left side wall, a U-shaped groove right side wall, a U-shaped groove bottom box main body, a separation belt, an anti-collision energy dissipation structure, a cushion layer main body, U-shaped groove bottom box steel bars, U-shaped groove side wall steel bars and a wall cap body, and the U-shaped groove left side wall and the U-shaped groove right side wall are located on the left side and the right side of the U-shaped groove bottom box main body correspondingly and are symmetrically distributed in an equal-height and equal-volume mode. The U-shaped groove bottom box body comprises a U-shaped groove pavement and a U-shaped groove bottom plate, and the U-shaped groove pavement is located above the U-shaped groove bottom plate. The inverted arch concrete U-shaped groove of the bottom box of the urban soft foundation expressway is simple in structural form, concrete is adopted for cast-in-place, the construction technology is effectively simplified, the construction period is shortened, and meanwhile better integrity is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of road bridge auxiliary structure engineering, in particular to an inverted arch concrete U-shaped groove of a bottom box of an urban soft foundation expressway. Background Art

[0002] In recent years, with the continuous development of urban infrastructure, my country's railway and highway transportation has developed rapidly. In order to facilitate transportation and improve safety, a large number of reconstruction and new expressway projects have gradually come out, and some lines inevitably pass under railways or highways, which makes it necessary to use U-shaped groove structures, which makes U-shaped groove structures widely used in railway and municipal fields. U-shaped groove structures have high rigidity, small deformation, good stability, excellent slope support effect, and can achieve good economic and technical benefits.

[0003] The U-shaped trough is generally composed of side walls and bottom plates of equal height on both sides, and the side walls can be approximately regarded as a single cantilever structure. Through investigation, it is found that when the existing traditional U-shaped trough structure is used in soft soil foundation areas, there are often problems such as complex structure, long construction period, insufficient bearing capacity, poor stability, bottom bulge, poor waterproof performance, low economic efficiency of anti-collision structure design, and waste of land resources; specifically, firstly, from the previous actual projects, the traditional U-shaped trough structure is relatively complex in structure design when applied to soft foundation expressway projects, which leads to complex construction process and long construction period; secondly, the side wall of the traditional U-shaped trough structure has weak ability to resist soil pressure, which increases the stress on the bottom box of the U-shaped trough, often leading to cracking of concrete at the intersection of the side wall and the bottom box of the U-shaped trough, which leads to instability and damage due to insufficient bearing capacity; secondly, the existing traditional highway U-shaped trough structures all need to be equipped with anti-collision guardrails to resist vehicle collisions and effectively absorb anti-collision energy.

[0004] However, because it is necessary to reserve guardrail installation space on both sides of the U-shaped groove, a wider U-shaped groove width is required to ensure that the net width inside the U-shaped groove meets the requirements, which will increase investment and waste land; secondly, the bottom of the traditional U-shaped groove is often bulged due to the uplift pressure of groundwater, which reduces the stability, safety and service life of the structure; secondly, the existing technology often increases the stability and bearing capacity of the U-shaped groove by thickening the side walls and the bottom box, resulting in a significant increase in the project cost; finally, the waterproof design of the existing traditional U-shaped groove structure has a long construction period, low economy and poor waterproof performance, resulting in reduced durability and firmness of the U-shaped material. Therefore, it needs to be improved. Utility Model Content

[0005] The utility model aims to provide an inverted arch concrete U-shaped groove of a bottom box of an urban soft foundation expressway, which solves the above-mentioned problems existing in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an urban soft foundation expressway bottom box inverted arch concrete U-shaped groove, the bottom box inverted arch concrete U-shaped groove is composed of a U-shaped groove left wall, a U-shaped groove right wall, a U-shaped groove bottom box body, a dividing strip, an anti-collision energy-absorbing structure, a cushion body, a U-shaped groove bottom box steel bar, a U-shaped groove side wall steel bar and a wall cap body, the U-shaped groove left wall and the U-shaped groove right wall are respectively located on the left and right sides of the U-shaped groove bottom box body, with equal height and equal volume symmetrical distribution, the U-shaped groove bottom box body includes a U-shaped groove pavement and a U-shaped groove bottom plate, and the U-shaped groove pavement is located above the U-shaped groove bottom plate;

[0007] The separation zone is U-shaped and is located at the center line of the U-shaped groove of the bottom box anti-arch concrete;

[0008] The anti-collision energy dissipation structure is located on the inner side of the left wall of the U-shaped groove and the right wall of the U-shaped groove and on the outer side of the dividing strip;

[0009] The cushion body is located below the U-shaped groove bottom box body, and the width of the cushion body is greater than that of the U-shaped groove bottom box body;

[0010] The U-shaped groove bottom box steel bar is arranged inside the U-shaped groove bottom plate, and the U-shaped groove bottom box steel bar includes the U-shaped groove bottom box upper main reinforcement, the U-shaped groove bottom box lower main reinforcement, the U-shaped groove bottom box distribution reinforcement, the U-shaped groove bottom box stirrups, and the rib angle reinforcement reinforcement;

[0011] The U-shaped groove side wall reinforcement is arranged inside the left wall of the U-shaped groove and the right wall of the U-shaped groove, and the U-shaped groove side wall reinforcement includes side wall main reinforcement, side wall negative reinforcement, side wall distribution reinforcement, and side wall stirrups;

[0012] The wall cap body is respectively arranged on the top of the left wall of the U-shaped groove and the right wall of the U-shaped groove, and the wall cap body includes wall cap main reinforcement and wall cap distribution reinforcement.

[0013] The left wall and the right wall of the U-shaped groove are set inwardly. The inward inclination angle is maintained between 1:0.4 and 1:0.5. The inclined structure resists soil pressure and the side facing the soil body can reduce the shear force between the soil body and the side wall of the structure, thereby reducing the stress on the main body of the U-shaped groove bottom box, thereby enhancing the overall stability and bearing capacity of the structure.

[0014] The bottom of the U-shaped trough bottom box body is horizontal, and an inverted arch is arranged on the upper part. The inverted arch degree is 1 / 400-1 / 500 of the width of the U-shaped trough bottom box body, and by arranging the inverted arch, the stress degree of the box bottom can be effectively reduced, and the bottom bulge caused by the uplift pressure of groundwater can be reduced, thereby increasing the stability and safety of the structure and extending the service life.

[0015] The anti-collision energy dissipation structure is an anti-collision energy dissipation protrusion arranged on the inner side of the left wall and the right wall of the U-shaped groove and on the outer side of the dividing strip. The lower side of the anti-collision energy dissipation structure is respectively connected to the inner side of the left wall and the right wall of the U-shaped groove. The interior of the anti-collision energy dissipation structure is provided with anti-collision main reinforcement, anti-collision negative reinforcement, anti-collision distribution reinforcement, and anti-collision stirrups. The anti-collision energy dissipation structure uses the side wall and the dividing strip as the energy dissipation structure and protection structure when the vehicle collides, replaces the anti-collision system of the side wall and the dividing strip plus the guardrail, cancels the original anti-collision guardrail, and achieves the purpose of saving costs and land. Moreover, the steel bars in the anti-collision energy dissipation structure are directly tied to the U-shaped groove bottom box body and the side wall, which has better integrity, effectively improves the anti-collision performance and further improves safety.

[0016] The cushion body is composed of a crushed stone cushion and a C15 plain concrete cushion, and the crushed stone cushion and the C15 plain concrete cushion are arranged from bottom to top. The cushion body is used to prevent groundwater from seeping up to the U-shaped trough bottom plate, the thickness of the crushed stone cushion is between 19cm and 21cm, and the thickness of the C15 plain concrete cushion is between 9cm and 11cm. By setting the cushion body, the waterproofness of the U-shaped trough bottom plate can be effectively improved.

[0017] The U-shaped groove pavement is paved with fine-grained SBS modified asphalt concrete, sprinkled tack layer asphalt, medium-grained asphalt concrete, solvent-based waterproof bonding layer, high-permeability modified epoxy waterproof material, and C40 waterproof concrete, and fine-grained SBS modified asphalt concrete, sprinkled tack layer asphalt, medium-grained asphalt concrete, solvent-based waterproof bonding layer, high-permeability modified epoxy waterproof material, and C40 waterproof concrete from top to bottom. The U-shaped groove pavement is used to prevent rainwater from seeping into the U-shaped groove bottom plate. Through the cooperation of the U-shaped groove pavement and the cushion body, the waterproof and water-stopping effects of the U-shaped groove bottom plate can be further improved while meeting the requirements of low economy, convenient construction, and improved durability, firmness and load-bearing capacity of the structure.

[0018] The beneficial effects of the utility model are as follows:

[0019] 1. The U-shaped concrete trough structure of the urban soft foundation expressway bottom box of the utility model is simple, and concrete is cast in situ, which effectively simplifies the construction process, reduces the construction period and has better integrity;

[0020] 2. The U-shaped trough side wall is tilted inwards. The tilted structure resists soil pressure. The side facing the soil can reduce the shear force between the soil and the side wall of the structure, thereby reducing the stress on the bottom box of the U-shaped trough, thereby enhancing the overall stability and bearing capacity of the structure;

[0021] 3. By setting up seismic isolation and energy dissipation structures inside and outside the side walls and dividing strips, the side walls and dividing strips are used as energy dissipation structures and protective structures when vehicles collide, replacing the anti-collision system of the side walls and dividing strips plus guardrails, and eliminating the original anti-collision guardrails, so as to achieve the purpose of saving costs and land;

[0022] 4. The U-shaped trough bottom box is equipped with an anti-arch, which can effectively reduce the stress on the bottom of the box and reduce the bottom bulge caused by the uplift pressure of groundwater, thereby increasing the stability and safety of the structure and extending its service life;

[0023] 5. In addition to the stress-bearing steel bars, the U-shaped groove side walls and bottom box are also equipped with structural steel bars, distribution steel bars and reinforcing steel bars of important sections, which can improve the durability of the structure and effectively reduce the thickness of the U-shaped groove side walls and bottom box, thereby reducing the amount of concrete, saving resources and protecting the environment;

[0024] 6. The seismic isolation and energy dissipation structural steel bars are directly tied to the U-shaped trough bottom box and side walls, which has better integrity, effectively improves the anti-collision performance and further improves safety;

[0025] 7. The waterproof design of the composite layer paving and cushion layer can effectively improve the waterproof and water-stopping effects of the U-groove bottom plate while meeting the requirements of low economy, convenient construction, and improving the durability, firmness and load-bearing capacity of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the overall cross-sectional view of the U-shaped groove of the utility model;

[0027] Figure 2 This is a schematic diagram of the reinforcement of 1 / 2 of the U-shaped groove of the utility model;

[0028] Figure 3 It is a detailed view of the collision surface of the anti-collision energy dissipation structure of the utility model and a schematic view of the main body of the U-shaped groove bottom box;

[0029] Figure 4 This is a schematic diagram of the wall cap body of the utility model;

[0030] Figure 5 It is a schematic diagram of the relationship between the U-shaped groove pavement and the U-shaped groove bottom plate of the utility model;

[0031] Figure 6 It is a schematic diagram of the cushion body of the utility model.

[0032] In the figure: 1. Left wall of U-shaped groove; 2. Right wall of U-shaped groove; 3. Main body of U-shaped groove bottom box; 4. Dividing strip; 5. Anti-collision energy-absorbing structure; 6. Main body of cushion layer; 7. Reinforcement of U-shaped groove bottom box; 8. Reinforcement of U-shaped groove side wall; 9. Wall cap body; 31. U-shaped groove pavement; 32. U-shaped groove bottom plate; 51. Anti-collision main reinforcement; 52. Anti-collision negative reinforcement; 53. Anti-collision distribution reinforcement; 54. Anti-collision stirrups; 61. Crushed stone cushion layer; 62. C15 plain concrete cushion layer; 71. Upper main reinforcement of U-shaped groove bottom box; 72. U-shaped Main reinforcement of the lower part of the trough bottom box; 73. Distribution reinforcement of the U-shaped trough bottom box; 74. Stirrups of the U-shaped trough bottom box; 75. Rib corner reinforcement; 81. Main reinforcement of the side wall; 82. Negative reinforcement of the side wall; 83. Distribution reinforcement of the side wall; 84. Stirrups of the side wall; 91. Main reinforcement of the wall cap; 92. Distribution reinforcement of the wall cap; 311. SBS modified asphalt concrete; 312. Sprinkled adhesive layer asphalt; 313. Medium-grained asphalt concrete; 314. Solvent-based waterproof bonding layer; 315. High-permeability modified epoxy waterproof material; 316. C40 waterproof concrete. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] See also Figure 1-6 , the U-shaped groove of the bottom box inverted arch concrete of the urban soft foundation expressway, the bottom box inverted arch concrete U-shaped groove is composed of the left wall 1 of the U-shaped groove, the right wall 2 of the U-shaped groove, the main body 3 of the U-shaped groove, the dividing strip 4, the anti-collision energy-absorbing structure 5, the main body 6 of the cushion layer, the bottom box steel bar 7, the side wall steel bar 8 of the U-shaped groove and the wall cap body 9. The left wall 1 of the U-shaped groove and the right wall 2 of the U-shaped groove are respectively located on the left and right sides of the main body 3 of the U-shaped groove, with equal height and equal volume symmetrical distribution. The left wall 1 of the U-shaped groove and the right wall 2 of the U-shaped groove are set inward. The inward inclination angle is maintained between 1:0.4 and 1:0.5. By resisting the soil pressure through the inclined structure, the side of the inclined face facing the soil body can reduce the shear force between the soil body and the side wall of the structure, thereby reducing the force on the main body 3 of the U-shaped groove bottom box, thereby enhancing the overall stability and bearing capacity of the structure. The dividing strip 4 is U-shaped and is located at the center line of the bottom box inverted arch concrete U-shaped groove.

[0035] See also Figure 1 , Figure 3 , Figure 5The U-shaped groove bottom box body 3 includes a U-shaped groove pavement 31 and a U-shaped groove bottom plate 32, and the U-shaped groove pavement 31 is located above the U-shaped groove bottom plate 32. The bottom of the U-shaped groove bottom box body 3 is horizontal, and an anti-arch is arranged on the upper part. The degree of the inverted arch is 1 / 400-1 / 500 of the width of the U-shaped groove bottom box body 3, and by setting the inverted arch, the stress degree of the box bottom can be effectively reduced, and the bottom bulge caused by the uplift pressure of groundwater can be reduced, thereby increasing the stability and safety of the structure and extending the service life. The U-shaped groove pavement 31 is paved with fine-grained SBS modified asphalt concrete 311, sprinkled adhesive layer asphalt 312, medium-grained asphalt concrete 313, solvent-based waterproof adhesive layer 314, high-permeability modified epoxy waterproof material 315, and C40 waterproof concrete 316, and the fine-grained SBS modified asphalt concrete 311, sprinkled adhesive layer asphalt 312, medium-grained asphalt concrete 313, solvent-based waterproof adhesive layer 314, high-permeability modified epoxy waterproof material 315, and C40 waterproof concrete 316 are laid from top to bottom. The U-shaped groove pavement 31 is used to prevent rainwater from seeping into the U-shaped groove bottom plate 32. Through the cooperation of the U-groove paving 31 and the cushion body 6, the waterproof and water-stopping effects of the U-groove bottom plate 32 can be further improved while meeting the requirements of low economy, convenient construction, and improved durability, firmness and load-bearing capacity of the structure.

[0036] See also Figure 1 , Figure 2 , Figure 3 The anti-collision energy dissipation structure 5 is located on the inner side of the left wall 1 and the right wall 2 of the U-shaped groove and on the outer side of the dividing strip 4. The anti-collision energy dissipation structure 5 is an anti-collision energy dissipation protrusion arranged on the inner side of the left wall 1 and the right wall 2 of the U-shaped groove and on the outer side of the dividing strip 4. The lower side of the anti-collision energy dissipation structure 5 is respectively connected to the inner side of the left wall 1 and the right wall 2 of the U-shaped groove. The anti-collision energy dissipation structure 5 is provided with anti-collision main reinforcement 51, anti-collision negative reinforcement 52, anti-collision distribution reinforcement 53, and anti-collision stirrup reinforcement 54. The anti-collision energy dissipation structure 5 uses the side wall and the dividing strip 4 as the energy dissipation structure and protection structure when the vehicle collides, replaces the anti-collision system of the side wall and the dividing strip 4 plus the guardrail, cancels the original anti-collision guardrail, and achieves the purpose of saving cost and land. Moreover, the steel bars in the anti-collision energy dissipation structure 5 are directly tied to the U-shaped groove bottom box body 3 and the side wall, which has better integrity, effectively improves the anti-collision performance and further improves safety.

[0037] See also Figure 1 , Figure 2 , Figure 6The cushion body 6 is located below the U-shaped trough bottom box body 3, and the width of the cushion body 6 is greater than that of the U-shaped trough bottom box body 3. The cushion body 6 is composed of a crushed stone cushion layer 61 and a C15 plain concrete cushion layer 62, and the crushed stone cushion layer 61 and the C15 plain concrete cushion layer 62 are arranged from bottom to top. The cushion body 6 is used to prevent groundwater from seeping up to the U-shaped trough bottom plate 32. The thickness of the crushed stone cushion layer 61 is between 19 cm and 21 cm, and the thickness of the C15 plain concrete cushion layer 62 is between 9 cm and 11 cm. By setting the cushion body 6, the waterproofness of the U-shaped trough bottom plate 32 can be effectively improved.

[0038] See also Figure 2 , Figure 3 , Figure 4 The U-shaped groove bottom box steel bar 7 is arranged inside the U-shaped groove bottom plate 32, and the U-shaped groove bottom box steel bar 7 includes the U-shaped groove bottom box upper main bar 71, the U-shaped groove bottom box lower main bar 72, the U-shaped groove bottom box distribution bar 73, the U-shaped groove bottom box stirrup 74, and the rib angle reinforcement bar 75. The U-shaped groove side wall steel bar 8 is arranged inside the U-shaped groove left wall 1 and the U-shaped groove right wall 2, and the U-shaped groove side wall steel bar 8 includes the side wall main bar 81, the side wall negative bar 82, the side wall distribution bar 83, and the side wall stirrup 84. The wall cap body 9 is respectively arranged on the top of the U-shaped groove left wall 1 and the U-shaped groove right wall 2, and the wall cap body 9 includes the wall cap main bar 91 and the wall cap distribution bar 92.

[0039] The specific implementation process of the utility model is as follows: the laying thickness of fine-grained SBS modified asphalt concrete 311 is 4cm-5cm; the thickness of the sprinkling adhesive layer asphalt 312 is 0.5-0.6 liters / m2; the laying thickness of the medium-grained asphalt concrete 313 is 5cm-6cm; the amount of the solvent-based waterproof adhesive layer 314 is 1-2 times 0.8kg / m2, the amount of the high-permeability modified epoxy waterproof material 315 is 12 times 0.4kg / m2, and the laying thickness of the C40 waterproof concrete 316 is 8cm-9cm; the thickness of the U-shaped groove bottom plate 32 is 80cm-97.55cm;

[0040] The thickness of the crushed stone cushion layer 61 is between 19 cm and 21 cm, and the thickness of the C15 plain concrete cushion layer 62 is between 9 cm and 11 cm.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. The U-shaped concrete groove of the bottom box of the urban soft foundation expressway is characterized by: The bottom box inverted arch concrete U-shaped trough is composed of a U-shaped trough left side wall (1), a U-shaped trough right side wall (2), a U-shaped trough bottom box body (3), a dividing strip (4), an anti-collision energy dissipation structure (5), a cushion layer body (6), a U-shaped trough bottom box steel bar (7), a U-shaped trough side wall steel bar (8) and a wall cap body (9). The U-shaped trough left side wall (1) and the U-shaped trough right side wall (2) are respectively located on the left and right sides of the U-shaped trough bottom box body (3), are symmetrically distributed with equal height and equal volume, and the U-shaped trough bottom box body (3) includes a U-shaped trough pavement (31) and a U-shaped trough bottom plate (32), and the U-shaped trough pavement (31) is located above the U-shaped trough bottom plate (32); The dividing strip (4) is U-shaped and is located at the center line of the U-shaped groove of the bottom box inverted arch concrete; The anti-collision energy dissipation structure (5) is located on the inner side of the left wall (1) and the right wall (2) of the U-shaped groove and on the outer side of the dividing strip (4); The cushion layer body (6) is located below the U-shaped groove bottom box body (3), and the width of the cushion layer body (6) is greater than that of the U-shaped groove bottom box body (3); The U-shaped groove bottom box steel bar (7) is arranged inside the U-shaped groove bottom plate (32), and the U-shaped groove bottom box steel bar (7) comprises a U-shaped groove bottom box upper main bar (71), a U-shaped groove bottom box lower main bar (72), a U-shaped groove bottom box distribution bar (73), a U-shaped groove bottom box stirrup (74), and a rib angle reinforcement bar (75); The U-shaped groove side wall reinforcement (8) is arranged inside the U-shaped groove left wall (1) and the U-shaped groove right wall (2), and the U-shaped groove side wall reinforcement (8) comprises side wall main reinforcement (81), side wall negative reinforcement (82), side wall distribution reinforcement (83), and side wall stirrups (84); The wall cap body (9) is respectively arranged on the top of the left wall (1) of the U-shaped groove and the right wall (2) of the U-shaped groove, and the wall cap body (9) comprises a wall cap main rib (91) and a wall cap distribution rib (92).

2. The U-shaped concrete groove of the bottom box of the urban soft foundation expressway according to claim 1 is characterized by: The left side wall (1) of the U-shaped groove and the right side wall (2) of the U-shaped groove are arranged inwardly.

3. The U-shaped concrete groove of the bottom box of the urban soft foundation expressway according to claim 1 is characterized by: The bottom of the U-shaped groove bottom box body (3) is horizontal, and an inverted arch is arranged on the upper part.

4. The U-shaped concrete groove of the bottom box of the urban soft foundation expressway according to claim 1 is characterized by: The anti-collision energy dissipation structure (5) is an anti-collision energy dissipation protrusion arranged on the inner side of the left wall (1) and the right wall (2) of the U-shaped groove and located on the outer side of the dividing strip (4); the lower side of the anti-collision energy dissipation structure (5) is respectively connected to the inner side of the left wall (1) and the right wall (2) of the U-shaped groove; and the interior of the anti-collision energy dissipation structure (5) is provided with anti-collision main reinforcement (51), anti-collision negative reinforcement (52), anti-collision distribution reinforcement (53), and anti-collision stirrup reinforcement (54).

5. The U-shaped concrete groove of the bottom box of the urban soft foundation expressway according to claim 1 is characterized by: The cushion layer body (6) is composed of a crushed stone cushion layer (61) and a C15 plain concrete cushion layer (62), and the crushed stone cushion layer (61) and the C15 plain concrete cushion layer (62) are arranged from bottom to top.

6. The U-shaped concrete groove of the bottom box of the urban soft foundation expressway according to claim 1 is characterized by: The U-shaped groove pavement (31) is paved with fine-grained SBS modified asphalt concrete (311), tack coat asphalt (312), medium-grained asphalt concrete (313), solvent-based waterproof bonding layer (314), high-permeability modified epoxy waterproof material (315), and C40 waterproof concrete (316), and the fine-grained SBS modified asphalt concrete (311), tack coat asphalt (312), medium-grained asphalt concrete (313), solvent-based waterproof bonding layer (314), high-permeability modified epoxy waterproof material (315), and C40 waterproof concrete (316) are arranged in order from top to bottom.

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