Broadening roadbed structure of high-fill embankment

Abstract

The utility model relates to the technical field of traffic engineering, in particular to a widened roadbed structure of a high-fill embankment, which comprises a retaining wall and a light soil filling area, the retaining wall is used for being arranged on one side of the edge of an existing roadbed, and the light soil filling area is formed by light concrete filled between the retaining wall and the existing roadbed. The retaining wall comprises a foundation, rib columns and baffles, the foundation is of a plurality of cast-in-place concrete structures arranged at intervals, the lower ends of the rib columns are fixedly inserted into the foundation, the multiple baffles are spliced to form a plate body structure, and the two ends of each baffle are connected to the adjacent rib columns correspondingly. The structure further comprises a plurality of anchor rods, the anchor rods are inserted into the existing roadbed and used for maintaining the stability of the existing roadbed, and the ends of the anchor rods are located in the light soil filling area. The assembly type retaining wall is combined with the light foam concrete, so that the pressure borne by the retaining wall is smaller, the retaining wall can be kept stable, and the stability and the safety in the high-fill embankment widening building construction process are improved by matching with the anchor rods.

Description

Technical Field

[0001] The utility model relates to the technical field of traffic engineering, and particularly relates to a widened subgrade structure for a high embankment. Background Art

[0002] With the development of the economy, the widening and expansion of early-built expressways in China are becoming increasingly frequent. Conventional road reconstruction and expansion construction methods have many drawbacks such as limited construction sites, high operation risks, and uneven settlement. During the reconstruction and expansion process, retaining walls are commonly used to limit the scope of reconstruction and maintain the stability of construction. Prefabricated retaining walls are widely used because a large number of precast components are adopted, and the construction efficiency is high. However, the existing retaining walls have low strength, which is not conducive to the stability of construction. Summary of the Invention

[0003] The purpose of the utility model is to provide a widened subgrade structure for a high embankment to improve the stability and safety during the construction of widening and building a high embankment.

[0004] To achieve the above purpose, the technical solution of the utility model is: a widened subgrade structure for a high embankment, including a retaining wall and a lightweight soil filling area. The retaining wall is used to be arranged on one side of the edge of the existing subgrade. The lightweight soil filling area is formed by lightweight concrete filled between the retaining wall and the existing subgrade. The retaining wall includes a foundation, rib columns, and baffles. The foundation is a plurality of cast-in-place concrete structures arranged at intervals. The lower ends of the rib columns are fixedly inserted on the foundation. A plurality of the baffles are spliced to form a plate structure, and both ends of the baffle are respectively connected to adjacent rib columns. It also includes a plurality of anchor rods. The anchor rods are inserted into the existing subgrade to maintain the stability of the existing subgrade, and the ends of the anchor rods are located in the lightweight soil filling area.

[0005] In one embodiment, the foundation includes a cup groove. The rib column is inserted into the cup groove. Non-shrinkage self-compacting concrete is poured between the outer wall of the rib column and the inner wall of the cup groove. Foam concrete is poured between adjacent foundations.

[0006] In one embodiment, a plurality of exposed foundation steel bars are provided at the top of the foundation. A plurality of exposed baffle steel bars are provided on the side of the baffle facing the foundation. The foundation steel bars and the baffle steel bars are welded and fixed.

[0007] In one embodiment, a C20 plain concrete cushion is provided at the bottom of the foundation.

[0008] In one embodiment, tension bars are provided on the side of the rib column facing the lightweight soil filling area. A plurality of the tension bars are arranged at intervals along the height direction of the rib column, and the ends of the tension bars extend into the lightweight soil filling area and are fixedly combined with the lightweight concrete in the lightweight soil filling area.

[0009] In one embodiment, a gravel cushion layer and a C20 plain concrete cushion layer are provided at the bottom of the lightweight soil filling area, and the gravel cushion layer is located below the C20 plain concrete cushion layer.

[0010] In one embodiment, the anchor rods are made of deformed steel bars and arranged in a plum blossom pattern, and the anchor rods are grouted by the bottom-hole reverse grouting method with a grout plug provided at the hole mouth, so as to realize the connection and fixation of the anchor rods with the existing subgrade.

[0011] In one embodiment, the anchor rods are inserted into the existing subgrade at an angle of 10°, and at least 1 meter of the length of the end of the anchor rods is located in the lightweight soil filling area.

[0012] The beneficial effects of the present utility model are as follows: By combining the prefabricated retaining wall with lightweight foamed concrete, the pressure borne by the retaining wall is smaller, which is beneficial to maintaining the stability of the retaining wall. By inserting anchor rods into the existing subgrade, the connection strength between the existing subgrade and the lightweight foamed concrete is improved through the anchor rods, thereby improving the stability and safety during the construction of widening and building high embankments. Description of the Drawings

[0013] Figure 1 is a schematic cross-sectional structure view of an embodiment of the present utility model.

[0014] Figure 2 is a schematic elevation structure view of the retaining wall of an embodiment of the present utility model.

[0015] Figure 3 is a schematic foundation structure view of the retaining wall of an embodiment of the present utility model.

[0016] Figure 4 is a schematic elevation structure view of the cast-in-place foundation of an embodiment of the present utility model.

[0017] Figure 5 is a schematic structure view of the anchor rod of an embodiment of the present utility model.

[0018] Wherein: 1 retaining wall, 10 lightweight foamed concrete, 11 foundation, 110 cup groove, 12 rib column, 121 tie bar, 13 baffle, 2 lightweight soil filling area, 3 anchor rod, 4 C20 plain concrete cushion layer, 5 gravel cushion layer, 100 existing subgrade. Detailed Embodiments

[0019] To further illustrate each embodiment, the present utility model provides accompanying drawings. These drawings are part of the disclosure of the present utility model, mainly used to illustrate the embodiments, and can cooperate with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0020] Referring to Figures 1 to 5 As shown, the present utility model discloses a widened subgrade structure for a high embankment, including a retaining wall 1 and a lightweight soil filling area 2. The retaining wall 1 is used to be arranged on one side of the edge of the existing subgrade 100. The lightweight soil filling area 2 is formed by lightweight foamed concrete 10 filled between the retaining wall 1 and the existing subgrade 100. The retaining wall 1 includes a foundation 11, rib columns 12 and a baffle 13. The foundation 11 is a cast-in-place concrete structure arranged at intervals. The lower ends of the rib columns 12 are fixedly inserted into the foundation 11. A plurality of baffles 13 are spliced to form a plate structure, and both ends of the baffle 13 are respectively connected to adjacent rib columns 12. It also includes a plurality of anchor rods 3. The anchor rods 3 are inserted into the existing subgrade 100 to maintain the stability of the existing subgrade 100, and the ends of the anchor rods 3 are located in the lightweight soil filling area 2. By combining the retaining wall 1 with the lightweight foamed concrete, the pressure borne by the retaining wall 1 is smaller, which is beneficial to maintaining the stability of the retaining wall 1. And by inserting the anchor rods 3 into the existing subgrade 100, the connection strength between the existing subgrade 100 and the lightweight foamed concrete 10 in the lightweight soil filling area 2 is improved through the anchor rods 3, thereby improving the stability and safety during the construction of the widened high embankment.

[0021] Referring to Figures 2 to 4 As shown, the foundation 11, rib columns 12 and baffle 13 are assembled to form a prefabricated retaining wall. Among them, the foundation 11 is a cast-in-place concrete structure, and both the rib columns 12 and the baffle 13 are factory prefabricated parts, which are installed and fixed at the construction site of the widened embankment to improve the construction efficiency.

[0022] The foundation 11 is provided with a cup groove 110. The cup groove 110 is a rectangular groove with a width of 21 cm and a depth of 50 cm arranged at the top of the foundation 11. The rib column 12 is inserted into the cup groove 110. Non-shrinkage self-compacting concrete is poured between the outer wall of the rib column 12 and the inner wall of the cup groove 110. A C20 plain concrete cushion 4 is poured between adjacent foundations. The non-shrinkage self-compacting concrete between the rib column 12 and the cup groove 110 of the foundation 11 can maintain the stability of the rib column 12, thereby improving the stability of the retaining wall 1.

[0023] There are multiple exposed foundation steel bars at the top of the foundation 11, and there are multiple exposed baffle steel bars on the side of the baffle 13 facing the foundation. The foundation steel bars and the baffle steel bars are welded and fixed. There is a weld seam of more than 5 cm between the foundation steel bars of the foundation 11 and the baffle steel bars of the baffle 13 to achieve welded fixation, realizing the fixation of the bottom of the baffle 13 and further improving the stability of the retaining wall 1. There is a C20 plain concrete cushion 4 at the bottom of the foundation 11 to improve the stability of the foundation and prevent the settlement of the foundation 11, thereby preventing a large settlement height difference between the widened part of the roadbed and the existing roadbed.

[0024] Refer to Figure 1 As shown, in order to improve the connection strength between the retaining wall 1 and the lightweight soil filling area 2, there are tension bars 121 on the side of the rib column 12 facing the lightweight soil filling area 2. A plurality of tension bars 121 are arranged at intervals along the height direction of the rib column 12, and the ends of the tension bars 121 extend into the lightweight soil filling area 2 and are fixedly combined with the lightweight foam concrete 10 in the lightweight soil filling area 2.

[0025] There is a gravel cushion 5 and a C20 plain concrete cushion 4 at the bottom of the lightweight soil filling area 2, and the gravel cushion 5 is located below the C20 plain concrete cushion 4. The C20 plain concrete cushion 4 and the gravel cushion 5 can support the lightweight foam concrete in the lightweight soil filling area 2, and can also absorb the ground pressure when the lightweight foam concrete is subjected to ground pressure, reducing the vibration of the lightweight soil filling area 2.

[0026] Refer to Figure 5 As shown, the anchor rod 3 uses threaded steel bars, arranged in a plum blossom shape, and the anchor rod grouting uses the bottom-hole reverse grouting method. A grouting stopper is set at the hole opening, the grouting pressure range is 1.5 - 2.0 MPa, the grouting is kept stable for 15 - 20 minutes, and the number of supplementary grouting times should be no less than 3 times, so as to realize the connection and fixation of the anchor rod 3 with the existing roadbed 100. The anchor rod 3 is inserted into the existing roadbed 100 at an angle of 10°, and at least 1 meter of the end of the anchor rod 3 is located in the lightweight soil filling area 2. During construction, the anchor rod 3 is inserted into the existing roadbed 100 at an angle of 10°, and at least 1 meter of its end is reserved outside the existing roadbed 100. After the lightweight soil filling area 2 is filled with lightweight foam concrete and solidifies, the anchor rod 3 is adhesively fixed to the lightweight foam concrete, realizing the stable connection between the lightweight soil filling area 2 and the existing roadbed 100.

[0027] Although the present invention is specifically shown and introduced in combination with the preferred implementation, those skilled in the art should understand that the remaining unstated parts are the prior art, and various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention defined by the appended claims all fall within the protection scope of the present invention.

Claims

1. A widening roadbed structure for a high fill embankment, characterized in that: It includes a retaining wall and a lightweight soil filling area, wherein the retaining wall is used to be set on one side of the edge of an existing roadbed, and the lightweight soil filling area is formed by lightweight concrete filled between the retaining wall and the existing roadbed. The retaining wall includes a foundation, rib columns and baffles, and the foundation is a plurality of cast-in-place concrete structures arranged at intervals. The lower end of the rib column is fixedly inserted on the foundation, and a plurality of baffles are spliced ​​to form a plate structure, and the two ends of the baffles are respectively connected to adjacent rib columns; it also includes a plurality of anchor rods, which are inserted in the existing roadbed to maintain the stability of the existing roadbed, and the ends of the anchor rods are located in the lightweight soil filling area.

2. The widening roadbed structure of a high embankment according to claim 1 is characterized in that: The foundation comprises a cup groove, the rib column is inserted in the cup groove, non-shrinkage self-compacting concrete is poured between the outer wall of the rib column and the inner wall of the cup groove, and foam concrete is poured between adjacent foundations.

3. The widening roadbed structure of a high embankment according to claim 1 is characterized in that: The top of the foundation is provided with a plurality of exposed foundation steel bars, and the side of the baffle facing the foundation is provided with a plurality of exposed baffle steel bars, and the foundation steel bars and the baffle steel bars are welded and fixed.

4. The widening roadbed structure of a high embankment according to claim 1 is characterized in that: The bottom of the foundation is provided with a C20 plain concrete cushion layer.

5. The widening roadbed structure of a high embankment according to claim 1, characterized in that: A tie bar is provided on the side of the rib column facing the lightweight soil filling area, and a plurality of the tie bars are arranged at intervals along the height direction of the rib column, and the ends of the tie bars extend to the lightweight soil filling area and are combined and fixed with the lightweight concrete of the lightweight soil filling area.

6. The widening roadbed structure of a high embankment according to claim 1, characterized in that: A crushed stone cushion layer and a C20 plain concrete cushion layer are provided at the bottom of the light soil filling area, and the crushed stone cushion layer is located below the C20 plain concrete cushion layer.

7. The widening roadbed structure of a high embankment according to claim 1 is characterized in that: The anchor rods are made of threaded steel bars arranged in a plum blossom shape, and the anchor rod grouting adopts the hole bottom reverse grouting method, and a grout stopper is provided at the hole mouth, thereby achieving the connection and fixation of the anchor rod and the existing roadbed.

8. The widening roadbed structure of a high embankment according to claim 7, characterized in that: The anchor rod is inserted into the existing roadbed at an angle of 10°, and the end of the anchor rod has a length of at least 1 meter and is located in the light soil filling area.

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