CN216809983U

CN216809983U - Roadbed retaining wall structure

Info

Publication number: CN216809983U
Application number: CN202120798928.4U
Authority: CN
Inventors: 牛圣宽; 贾瑞雨; 蔡鹏�; 邹小龙; 高原; 张钰; 秦钜泽
Original assignee: Changjiang Institute of Survey Planning Design and Research Co Ltd
Current assignee: Changjiang Institute of Survey Planning Design and Research Co Ltd
Priority date: 2021-04-19
Filing date: 2021-04-19
Publication date: 2022-06-24
Anticipated expiration: 2031-04-19

Abstract

The utility model provides a roadbed retaining wall structure, which comprises a retaining wall and a concrete foundation, wherein anchor bar piles anchored into rock masses on the inner side of a roadbed are arranged on the retaining wall; bottom surface anchoring steel bars and lateral anchoring steel bars are arranged in the bottom surface and the inner side stepped side surface of the concrete foundation respectively; the anchor pile comprises a steel bar bundle formed by three anchor bars by means of staggered welding and a grouting pipe tightly attached to the steel bar bundle, and centering steel bars are arranged on the peripheries of the steel bar bundle and the grouting pipe at intervals. The retaining wall is additionally provided with the anchor bar piles, and the bottom anchoring reinforcing steel bars and the lateral anchoring reinforcing steel bars are additionally arranged on the stepped concrete foundation, so that the anti-sliding and anti-overturning capacity and the overall stability of the retaining wall of the roadbed are obviously improved, and the safety of the retaining wall of the roadbed is improved; in addition, by arranging the centering steel bars and the grouting pipes, the anchor bar pile can adopt a construction process of 'inserting rods first and then grouting', so that the engineering construction difficulty is reduced, and the engineering investment is saved.

Description

Roadbed retaining wall structure

Technical Field

The utility model belongs to the technical field of road construction, and particularly relates to a roadbed retaining wall structure.

Background

In recent years, China has achieved great success in building traffic infrastructures, and retaining walls are widely applied to the fields of roads, railways, municipal works and the like with remarkable technical and economic benefits. In mountain road steep slope sections, retaining walls of sections with limited terrain or insufficient foundation bearing capacity and poor stability, foundation treatment or deep foundation adoption is usually required. Common forms of retaining wall foundations include an enlarged foundation and a pile foundation. The enlarged foundation excavation volume is larger, and the disturbance to the natural rock-soil body of the steep slope is easily caused, so that the integral stability of the slope is influenced. The pile foundation construction machinery is complex, the construction difficulty is high in steep slope terrains or narrow terrains, and the construction cost is high.

Therefore, the current roadbed retaining wall structure needs to be improved, and a utility model patent with the publication number of CN204662494U provides a highway retaining wall reinforced structure, which comprises a bedrock and a retaining wall body arranged below a highway pavement, wherein a covering layer is arranged between the bedrock and the retaining wall body, a reinforced concrete panel is also arranged on the outer side of the retaining wall body, the reinforced concrete panel is fixed on the outer side of the retaining wall body through an anchor rope, an outer anchor pier of the anchor rope and the reinforced concrete panel are integrally cast into a whole, and an anchoring end of the anchor rope penetrates through the covering layer and goes deep into the bedrock; the utility model discloses a through adopt the anchor rope to add the measure of reinforced concrete panel to highway retaining wall, tightly lock the overburden behind highway retaining wall and the retaining wall on the basement rock, effectively improved the stability of retaining wall. The utility model discloses a utility model with publication number CN205387721U provides a highway retaining wall reinforced structure, including retaining wall and basement, the right side of retaining wall is provided with steel frame construction, be provided with the backfill layer between retaining wall and the basement, the lower extreme of retaining wall and concrete foundation fixed connection, the left side of retaining wall is provided with the support post, the bottom and concrete foundation fixed connection of support post, concrete has been pour between support post and the retaining wall, be provided with the anchor cable between retaining wall and the basement, the one end of anchor cable penetrates in the basement, the other end penetrates in the retaining wall, the anchor board is installed to the one end that the anchor cable penetrated in the retaining wall, be provided with the reticular layer on the right flank of basement, this highway retaining wall reinforced structure has advantages such as structural design is reasonable, firm degree is high, safe practicality, the strength of the retaining wall can be greatly improved.

In the technique that discloses at present, mostly adopt to set up anchor rope structure and improve the intensity and the stability of retaining wall, nevertheless it needs carry out certain transformation to the structure of retaining wall itself, has increaseed the engineering construction degree of difficulty and engineering investment.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the background art, the utility model provides a roadbed retaining wall structure, which has the advantages that the stability and the safety of a roadbed foundation and a retaining wall are guaranteed, meanwhile, the structure change of the retaining wall is less, the engineering construction difficulty is reduced, and the engineering investment is saved.

The technical scheme includes that the retaining wall comprises a retaining wall body and a concrete foundation, and anchor bar piles anchored into rock masses on the inner side of a roadbed are arranged on the retaining wall body.

And bottom surface anchoring steel bars and lateral anchoring steel bars are respectively arranged in the bottom surface and the inner side stepped side surface of the concrete foundation.

The anchor bar pile comprises a steel bar bundle formed by three anchor bars through staggered welding and a grouting pipe tightly attached to the steel bar bundle, and centering steel bars are arranged on the peripheries of the steel bar bundle and the grouting pipe at intervals.

The distance H1 between the exposed end of the anchor bar pile and the wall top of the retaining wall is 0.15-0.2 times of the height H of the retaining wall, the included angle between the anchor bar pile and the horizontal direction is 10-15 degrees, and the distance Lm between the pile head at the inner end of the anchor bar pile and the hole bottom of the drilled hole is 50 cm.

And a steel backing plate and a concrete seal layer are sequentially arranged on the exposed pile head at the outer end of the anchor bar pile.

The bottom surface anchoring reinforcing steel bars are arranged at intervals in the vertical direction, and the lateral anchoring reinforcing steel bars are arranged at intervals at an included angle of 10-15 degrees with the horizontal direction.

Compared with the prior art, the utility model obviously improves the anti-sliding and anti-overturning capacities of the retaining wall by additionally arranging the anchor bar piles on the retaining wall; secondly, by additionally arranging bottom anchoring reinforcing steel bars and lateral anchoring reinforcing steel bars on the stepped concrete foundation, the disturbance of foundation excavation to steep slope rock-soil bodies is effectively reduced, meanwhile, the cohesiveness of the retaining wall foundation and foundation rock bodies is enhanced, the overall stability and the anti-sliding capability of the retaining wall foundation are improved, and therefore the anti-sliding and anti-overturning capabilities of the retaining wall are further improved; the steel backing plate and the concrete seal layer are sequentially arranged on the exposed pile head of the anchor bar pile, so that the metal is effectively prevented from being corroded in the air; and fourthly, by arranging the centering steel bars and the grouting pipes, the anchor bar pile can adopt a construction process of inserting the rods first and then grouting, so that the construction difficulty of the engineering is reduced.

The utility model greatly improves the stability and safety of the roadbed foundation and the retaining wall, reduces the engineering construction difficulty and saves the engineering investment.

Drawings

Fig. 1 is a schematic view of a roadbed retaining wall structure additionally provided with anchor bar piles.

Fig. 2 is a schematic cross-sectional view of a tendon pile a-a.

Fig. 3 is an enlarged schematic view of an exposed end head K of the anchor bar pile.

Wherein: 1-a retaining wall; 2-concrete foundation; 3-anchoring reinforcing steel bars on the bottom surface; 4-anchoring the steel bar laterally; 5-anchor bar pile; 6-a steel backing plate; 7-reinforcing steel bars; 8-pavement; 9-slope surface line; 10-concrete sealing; 11-anchor bars; 12-centering the reinforcing steel bars; 13-grouting pipe; 14-cement mortar.

Detailed Description

The utility model will be further described in detail with reference to the drawings and specific embodiments for clear understanding of the utility model, but they are not to be construed as limiting the utility model, which is limited only by way of example, and the advantages of the utility model will become clearer and more readily appreciated by reference to the description. The positional relationships described in the embodiments are all in accordance with those shown in the drawings.

Referring to fig. 1, a retaining wall 1 is arranged above a roadbed retaining wall, a concrete foundation 2 is arranged below the roadbed retaining wall, the width W1 of the outer side of the concrete foundation 2 exceeding the toe is 50cm, and the width W2 of the inner side exceeding the heel is 100-200 cm; the bottom of the concrete foundation 2 is positioned below the slope surface line 9, and the bearing capacity meets the requirement in the bearing layer. The inner side of the concrete foundation 2 is designed to be a ladder shape, and the height h and the width b of each ladder are both 1.0 m. The retaining wall 1 and the concrete foundation 2 can be cast by C20 concrete; the balance weight table position of retaining wall 1 sets up reinforcing bar 7, and reinforcing bar 7 is plain round steel bar.

In the construction requirement, the concrete foundation 2 is buried deep not less than 1.0m in the gravel soil and completely weathered road section, and the width of the front edge is not less than 1.5 m; the foundation burial depth of the strongly weathered road section is not less than 1.0m, and the width of the front edge is not less than 1.0 m. When the height H of the concrete foundation 2 is less than or equal to 5m, the bearing capacity of the foundation is not less than 500 kPa; when H is more than 5m and less than or equal to 7m, the bearing capacity of the foundation is not less than 600 kPa; when H is more than 7m and less than or equal to 12m, the bearing capacity of the foundation is not less than 1000 kPa.

The bottom surface anchoring steel bars 3 and the lateral anchoring steel bars 4 are respectively arranged on the bottom surface and the inner side stepped side surface of the concrete foundation 1, preferably, the bottom surface anchoring steel bars 3 are vertically arranged, one end is anchored into the concrete foundation 2, and the other end is anchored into a foundation rock stratum; the lateral anchoring steel bars 4 are arranged at an included angle of 10-15 degrees with the horizontal direction, one end of each lateral anchoring steel bar is anchored into the concrete foundation 2, and the other end of each lateral anchoring steel bar is anchored into a foundation rock stratum. In the embodiment, the number of the bottom anchoring steel bars 3 and the number of the lateral anchoring steel bars 4 are three respectively, the bottom anchoring steel bars and the lateral anchoring steel bars are arranged at intervals, and the longitudinal and transverse intervals are 1.5 m; the bottom surface anchoring reinforcing steel bar 3 and the lateral anchoring reinforcing steel bar 4 are HRB400 reinforcing steel bars with the diameter of 28mm, the total length of the bottom surface anchoring reinforcing steel bar 3 and the lateral anchoring reinforcing steel bar 4 is 6m, and the length of anchoring into the concrete foundation 2 is equal to the length of anchoring into a foundation rock stratum and is 3 m.

Preferably, the distance H1 between the exposed end hole of the anchor bar pile 5 and the wall top of the retaining wall 1 is 0.15-0.2 times of the height H of the retaining wall, and the included angle between the anchor bar pile 5 and the horizontal direction is 10-15 degrees. The height H of the retaining wall is 8m, then H1 can be 1.2-1.6m, in the embodiment, H1 is 1.2 m; the length Le of the anchoring section of the anchor bar pile 5 anchored into the rock mass on the inner side of the roadbed is 6 m.

Referring to fig. 2, the anchor pile 5 comprises three anchor bars 11, wherein the anchor bars 11 are made of HRB400 steel bars with the diameter of 28mm, and are welded at staggered joints to form an integral tendon bundle; the welded steel bar bundles are provided with one centering steel bar 12 every 2m, the centering steel bar 12 can be formed by welding 8mm HPB300 steel bars, the ring in the middle of the centering steel bar 12 is used for enclosing the steel bar bundles, and three pay-out bars can be supported on the wall of a drilled hole to ensure that the steel bar bundles are suspended in the drilled hole; the outer side of the anchor bar 11 is provided with a grouting pipe 13 in an attaching mode, and the diameter of the grouting pipe 13 is 20 mm.

In the construction process, the construction of the anchor bar pile 5 adopts a construction process of 'inserting rods first and then grouting', the diameter of a drilled hole for the construction of the anchor bar pile 5 is 170mm, the depth of the drilled hole is 50cm longer than that of an anchoring section, namely, the distance Lm between the pile head at the inner end of the anchor bar pile 5 and the bottom of the drilled hole is 50 cm. If the hole collapse inside the roadbed is serious in the drilling process, a sleeve can be additionally arranged. And (3) cleaning the holes immediately after the drilled holes reach the designed depth, inserting the anchor bar piles 5 after the holes are cleaned to be qualified, and then grouting through the grouting pipes 13 to enable the drilled holes to be filled with cement mortar 14, wherein the used cement mortar 14 can be M30 cement mortar. Along the route direction of road, the anchor bar pile 5 can set up a set ofly every 5m to can guarantee the stability and the security of whole road.

Referring to fig. 3, the pile head of the anchor pile 5 is exposed by 15cm and is welded firmly with the steel backing plate 6, the steel backing plate 6 is a steel plate with the thickness of 30cm × 30cm × 2cm, the concrete seal 10 with the thickness not less than 50mm is made by sealing the outside of the steel backing plate 6 with C20 concrete, and the concrete seal 10 is required to be compact and crack-free to prevent the steel backing plate 6 and the steel bars from being exposed and corroded by air.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings and specific examples, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

Claims

1. A road bed retaining wall structure, includes retaining wall (1) and concrete foundation (2), its characterized in that: the retaining wall (1) is provided with an anchor bar pile (5) anchored into a rock mass on the inner side of the roadbed; the bottom surface and the inner side stepped side surface of the concrete foundation (2) are respectively provided with a bottom surface anchoring reinforcing steel bar (3) and a lateral anchoring reinforcing steel bar (4); the anchor pile (5) comprises a reinforcing bar bundle formed by three anchor bars (11) through staggered welding and a grouting pipe (13) tightly attached to the reinforcing bar bundle, and centering reinforcing bars (12) are arranged on the peripheries of the reinforcing bar bundle and the grouting pipe (13) at intervals.

2. A roadbed retaining wall structure according to claim 1, wherein: the distance H1 between the exposed end of the anchor bar pile (5) and the wall top of the retaining wall (1) is 0.15-0.2 times of the height H of the retaining wall, the included angle between the anchor bar pile (5) and the horizontal direction is 10-15 degrees, and the distance Lm between the pile head at the inner end of the anchor bar pile (5) and the bottom of the drilling hole is 50 cm.

3. A roadbed retaining wall structure according to claim 2, wherein: and a steel backing plate (6) and a concrete seal layer (10) are sequentially arranged on the exposed pile head at the outer end of the anchor bar pile (5).

4. A roadbed retaining wall structure according to any one of claims 1 to 3, wherein: the bottom surface anchoring steel bars (3) are arranged at intervals in the vertical direction, and the lateral anchoring steel bars (4) are arranged at intervals at an included angle of 10-15 degrees with the horizontal direction.