CN216075077U - Hole digging pile foundation of double-layer protective wall for contact net in seasonal frozen soil area - Google Patents
Hole digging pile foundation of double-layer protective wall for contact net in seasonal frozen soil area Download PDFInfo
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- CN216075077U CN216075077U CN202122344315.6U CN202122344315U CN216075077U CN 216075077 U CN216075077 U CN 216075077U CN 202122344315 U CN202122344315 U CN 202122344315U CN 216075077 U CN216075077 U CN 216075077U
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Abstract
The utility model provides a hole digging pile foundation of a double-layer retaining wall for a contact net in a season frozen soil area, which comprises a cast-in-place pile, an inner-layer retaining wall, an outer-layer retaining wall and non-frozen swelling soil, wherein the inner-layer retaining wall is arranged outside the cast-in-place pile, the outer-layer retaining wall is arranged outside the inner-layer retaining wall, the non-frozen swelling soil is filled between the inner-layer retaining wall and the outer-layer retaining wall, and the non-frozen swelling soil is arranged above the outer-layer retaining wall. The outer-layer retaining wall has the functions of supporting and preventing water of a foundation pit and blocking the foundation from contacting with frost heaving soil; the inner layer of the retaining wall is used for protecting the pile foundation template and the pile foundation; non-frost heaving soil is backfilled in gaps between the double-layer retaining walls, and the influence of frost heaving force on the pile foundation is eliminated.
Description
Technical Field
The utility model belongs to the field of rail transit, and particularly relates to a dug pile foundation for a double-layer retaining wall of a contact net in a seasonal frozen soil area.
Background
The electrified railway contact net is a transmission line for supplying power to an electric locomotive, and is concerned with the safety of railway operation. The contact net support foundation generally adopts the independent basis of direct burial formula basis or cast-in-place reinforced concrete, and the basis is generally buried in and is frozen the deep line below 500 mm. In high latitude areas of China, the frozen soil is generally longer in winter, the depth of the frozen soil is large, and particularly, the foundation soil in northeast areas has high water content and strong frost heaviness. The partial contact net support foundation is pulled up, inclined or cracked in winter, and sinks to different degrees in the ablation period, so that the support is inclined, and the hard span is inclined or twisted, and the driving safety is seriously influenced.
The stress characteristics of the contact net support are that the horizontal force is larger, the self weight is small, and the anti-freezing pulling capacity is poor; the construction conditions along the railway are limited, the excavation of foundation construction is mostly carried out in an excavation mode, the excavation and bottom expanding of the foundation are difficult, and the excavation amount is large if excavation is carried out according to the size of the foundation, so that the stability of the roadbed is influenced; when soft soil or underground water level is high, the foundation pit is not easy to form, and the foundation size is not easy to guarantee; the surface of the foundation is rough, and the friction force between the foundation and the soil is large; later stage foundation ditch backfill compaction is not enough, and construction quality is difficult to guarantee. The factors cause very serious basic freeze injury of the contact net support column in the seasonal frozen soil area.
Disclosure of Invention
The utility model aims at the technical problems in the prior art and provides a dug pile foundation for a double-layer protective wall of a contact net in a seasonal frozen soil area, and the aims of anti-overturning stability and frost heaving resistance of the foundation are fulfilled through a double-layer prefabricated protective wall.
The technical scheme adopted by the utility model is as follows: the hole digging pile foundation for the double-layer retaining wall of the contact net in the season frozen soil region comprises a cast-in-place pile, an inner-layer retaining wall, an outer-layer retaining wall and non-frozen soil, wherein the inner-layer retaining wall is arranged outside the cast-in-place pile, the outer-layer retaining wall is arranged outside the inner-layer retaining wall, the non-frozen soil is filled between the inner-layer retaining wall and the outer-layer retaining wall, and the non-frozen soil is arranged above the outer-layer retaining wall.
Furthermore, a bearing platform is arranged above the cast-in-place pile and the inner-layer retaining wall, and non-frost heaving soil is arranged beside the bearing platform.
Furthermore, the inner-layer retaining wall and the outer-layer retaining wall are formed by splicing a plurality of prefabricated annular retaining wall sections.
Furthermore, the annular wall protecting sections are connected through tongue-and-groove joints.
Furthermore, the upper end of the annular retaining wall section is provided with a groove, and a hanging ring is arranged in the groove.
Furthermore, the filling pile adopts a club-footed pile.
The working principle is as follows: the outer-layer retaining wall has the functions of supporting and preventing water of the foundation pit and blocking the foundation from contacting with frost heaving soil; the inner layer of the retaining wall is used for protecting the pile foundation template and the pile foundation; the cast-in-place pile adopts a club-footed pile and is used for increasing the anti-freezing pulling force; non-frost heaving soil is backfilled in gaps between the double-layer retaining walls, and the influence of frost heaving force on the pile foundation is eliminated. The upper end of each section of the annular retaining wall joint is provided with a groove, a hanging ring is reserved in the groove, the lifting and the carrying are convenient, and the arrangement of the hanging ring does not influence the installation and the connection of each section of the annular retaining wall joint and the sinking of the annular retaining wall joint; the side surfaces of the annular retaining wall sections are not provided with lifting mounting holes, and the annular retaining wall sections are connected through the tongue-and-groove, so that the waterproof of the foundation pit is facilitated, and the size and the verticality of the foundation pit are ensured.
Compared with the prior art, the utility model has the beneficial effects that: 1. the anti-freezing capacity of the foundation is improved, the freezing damage problem of the foundation is effectively eliminated, and the driving safety is prevented from being endangered due to the inclination of the supporting column or the contact suspension deflection; 2. the problem of excavation of the foundation pit is solved, disturbance to the roadbed can be reduced, and the influence of large excavation of the foundation pit on the stability of the roadbed is avoided; 3. the waterproof structure can effectively prevent water and ensure the forming quality of the foundation pit and the foundation; 4. the smoothness of the surface of the foundation is improved, and the friction force between the foundation and the soil is reduced; 5. compared with the conventional method, the foundation burial depth and the foundation size can be reduced, and the foundation cost is effectively reduced.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of an annular retaining wall segment according to an embodiment of the present invention;
fig. 3 is a schematic structural view of an annular retaining wall section at the bottom of a cast-in-place pile according to an embodiment of the present invention.
In the figure, 1-a cast-in-place pile, 2-an inner protective wall, 3-an outer protective wall, 4-non-frost heaving soil, 5-a pillar, 6-a bearing platform, 7-an annular protective wall joint, 8-a groove and 9-a hanging ring.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment of the utility model provides a dug pile foundation of a double-layer retaining wall for a contact net in a seasonal frozen soil region, which comprises a cast-in-place pile 1, an inner retaining wall 2, an outer retaining wall 3 and non-frost heaving soil 4 as shown in figures 1 to 3. An inner-layer retaining wall 2 is arranged outside the cast-in-place pile 1, and the inner-layer retaining wall 2 is a pile body retaining wall and is used for protecting a pile foundation template and a pile foundation. An outer-layer retaining wall 3 is arranged outside the inner-layer retaining wall 2, and the outer-layer retaining wall 3 is a foundation pit retaining wall and is used for foundation pit supporting, underground water protection and blocking contact between frost heaving soil and a pile foundation. Non-frost heaving soil 4 is filled between the inner-layer retaining wall 2 and the outer-layer retaining wall 3, and the influence of frost heaving force on the pile foundation is thoroughly eliminated. And bearing platforms 6 are arranged above the cast-in-place piles 1 and the inner-layer retaining walls 2, and non-frost heaving soil 4 is arranged beside the bearing platforms 6. A support post 5 of a contact net is fixed above the bearing platform 6. The top surface of the outer-layer protecting wall 3 is lower than the ground by a certain height, and non-frost heaving soil 4 is backfilled on the top surface of the outer-layer protecting wall for offsetting possible upwarp deformation generated after the outer-layer protecting wall 3 is subjected to tangential frost heaving force. The cast-in-place pile 1 adopts a pedestal pile, and the pile end is pedestal-expanded to improve the anti-freeze-drawing capability and reduce the foundation burial depth.
The inner-layer protecting wall 2 and the outer-layer protecting wall 3 are formed by splicing a plurality of prefabricated annular protecting wall sections 7. The side surface of the annular retaining wall joint 7 is not provided with a lifting mounting hole, but is provided with a groove 8 at the upper end, and a lifting ring 9 is arranged in the groove 8, so that the annular retaining wall joint 7 is convenient to lift and carry, the connection between the annular retaining wall joints 7 and the sinking of the annular retaining wall joint 7 are not influenced, and the outer surface of the annular retaining wall joint 7 is smooth, and the influence of tangential frost heaving force can be reduced. The annular retaining wall sections 7 are connected through the tongue-and-groove, so that the waterproof of the foundation pit is facilitated, and the size and the verticality of the foundation pit are ensured.
During construction, the outer-layer retaining wall 3 is installed firstly, and when a section of soil body is excavated, a section of annular retaining wall joint 7 is installed and sinks along with excavation until all the sections are installed in place. Then the inner-layer retaining wall 2 is installed, and after each section of annular retaining wall section 7 is installed, non-frost heaving soil 4 needs to be filled between the annular retaining wall section and the outer-layer retaining wall 3, and the annular retaining wall is compacted in a layered manner. And finally, installing a reinforcement cage, and pouring concrete to manufacture the cast-in-place pile 1.
The present invention has been described in detail with reference to the embodiments, but the description is only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The scope of the utility model is defined by the claims. The technical solutions of the present invention or those skilled in the art, based on the teaching of the technical solutions of the present invention, should be considered to be within the scope of the present invention, and all equivalent changes and modifications made within the scope of the present invention or equivalent technical solutions designed to achieve the above technical effects are also within the scope of the present invention.
Claims (6)
1. The utility model provides a hole digging pile basis that is used for double-deck dado of contact net in frozen soil area in season which characterized in that: including bored concrete pile, inlayer dado, outer dado and non-frost heaving soil, the bored concrete pile is provided with the inlayer dado outward, be provided with the outer dado outward from the inlayer dado, it has non-frost heaving soil to fill between inlayer dado and the outer dado, the top of outer dado is provided with non-frost heaving soil.
2. The dug pile foundation of the double-layer retaining wall for the contact net in the seasonally frozen ground area as claimed in claim 1, wherein: bearing platforms are arranged above the cast-in-place piles and the inner-layer retaining wall, and non-frost heaving soil is arranged beside the bearing platforms.
3. The dug pile foundation of the double-layer retaining wall for the contact net in the seasonally frozen ground area as claimed in claim 1, wherein: the inner-layer retaining wall and the outer-layer retaining wall are formed by splicing a plurality of prefabricated annular retaining wall sections.
4. The dug pile foundation of the double-layer retaining wall for the contact net in the seasonally frozen ground area as claimed in claim 3, wherein: the annular protecting wall sections are connected through tongue-and-groove joints.
5. The dug pile foundation of the double-layer retaining wall for the contact net in the seasonally frozen ground area as claimed in claim 3, wherein: the upper end of the annular retaining wall joint is provided with a groove, and a hanging ring is arranged in the groove.
6. The dug pile foundation of the double-layer retaining wall for the contact net in the seasonally frozen ground area as claimed in claim 1, wherein: the cast-in-place pile adopts a club-footed pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122344315.6U CN216075077U (en) | 2021-09-27 | 2021-09-27 | Hole digging pile foundation of double-layer protective wall for contact net in seasonal frozen soil area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122344315.6U CN216075077U (en) | 2021-09-27 | 2021-09-27 | Hole digging pile foundation of double-layer protective wall for contact net in seasonal frozen soil area |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216075077U true CN216075077U (en) | 2022-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122344315.6U Active CN216075077U (en) | 2021-09-27 | 2021-09-27 | Hole digging pile foundation of double-layer protective wall for contact net in seasonal frozen soil area |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216075077U (en) |
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2021
- 2021-09-27 CN CN202122344315.6U patent/CN216075077U/en active Active
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