CN113897829A

CN113897829A - Mountain-separating roadbed structure with partially overlapped upper plane

Info

Publication number: CN113897829A
Application number: CN202110861301.3A
Authority: CN
Inventors: 张瑜; 孙国富; 王哲
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-01-07

Abstract

The invention discloses a partially overlapping mountainside separated roadbed structure form on a plane, belonging to the technical field of highway engineering. The structure is composed of main components such as anti-slide piles, prestressed anchor cables, beams, road panels, connecting beams, earth retaining plates, and anti-collision guardrails. The invention combines and innovates various structural forms, reduces the disturbance range and environmental impact of the separated roadbed structure in mountainous areas, and has the advantages of fully exerting structural efficiency, high utilization rate of structural space, good structural stability and reliability, and moderate construction difficulty. It has the characteristics of good environment and economic benefits, which provides a new solution for the design of separate subgrade structures in mountainous areas, and has popularization and application value in the field of highway engineering technology.

Description

Mountain-separating roadbed structure with partially overlapped upper plane

Technical Field

The invention relates to a highway subgrade structure, in particular to a mountain-crossing separating subgrade structure which is suitable for a steep ground transverse slope in a mountainous area and partially overlapped on a plane, and belongs to the technical field of highway engineering.

Background

The countryside is vast, and mountain areas and hilly areas account for about two thirds of the total area of the country. In recent years, with the rapid development of traffic construction in China, highway construction gradually extends to remote mountainous areas with complex terrains, engineering construction conditions of the areas are difficult, mountains continuously fluctuate, and terrains, geologies and hydrology conditions are extremely complex. In order to adapt to terrains and overcome height differences, the separated subgrade is applied to various levels of highways more and more. How to accurately grasp the characteristics and difficulties of the mountain road, reasonably apply technical indexes, flexibly arrange wires, relate to the use function and the service level of the road, and are the keys of reducing the construction cost, protecting the ecological environment and saving the operation cost.

The separated roadbed can be divided into two forms of a planar linear separated roadbed and a high-low separated roadbed (a platform-separated roadbed) with separated vertical surface elevations. Generally, the separated subgrade refers to a planar linear separated subgrade, namely a subgrade form with independent planar and longitudinal design lines is separately designed for an upper lane and a lower lane; the high-low separation type roadbed means that the upper and lower lanes share a uniform design center line, or the separation distance of the center line is small (only meeting the requirement of arranging retaining walls and side ditches), and the longitudinal section line adopts a roadbed form with different design elevations.

The high-low separation type roadbed can well adapt to steep terrains and ground objects in mountainous areas due to the flexibility and the variability, and is widely applied to the design of highways in various grades of mountainous areas. Because the split roadbed has great advantages in the aspects of overcoming the height difference of the cross section, reducing excavation, protecting the ecological environment and the like, when the scheme that the mountain waist line and the mountain line are extended along the two sides of the bealock in the steep sections of the cross slope such as a mountain area or a heavy hill area is adopted, the split roadbed can obtain better effect.

The up-down lanes of the currently common high-low separation type roadbed share a uniform design center line, or the separation distance of the center line is small, the up-down lanes respectively have independent roadbed structures, no overlapping part exists on the plane, and the disturbance range of the whole roadbed structure to the mountain is smaller than that of the common plane linear separation type roadbed. The separated subgrade structure with the partially overlapped mountains on the plane can further reduce the disturbance range of the separated subgrade structure on the mountains, reduce the environmental influence and have better stability and applicability.

Disclosure of Invention

The separated subgrade structure with the partially overlapped mountains on the plane has multiple functions of mountain anchoring, slope retaining, double-layer driving and the like, can further reduce the disturbance range of the separated subgrade structure on the mountain, reduces the environmental influence, and has better stability and applicability.

In order to achieve the purpose, the invention adopts the technical scheme that:

a kind of mountain separation type roadbed structure form of the plane upper part overlap, characterized by that: the structure comprises inner-side anti-slide piles (1), upper anchor cables (2), upper soil retaining plates (3), inner-side connecting beams (4), cross beams (5), road surface plates (6), outer-side connecting beams (7), upper anti-collision guardrails (8), outer-side anti-slide piles (9), lower soil retaining plates (10), lower anti-collision guardrails (11), a roadbed structure (12), side ditches (13) and lower anchor rods (14); the inner side anti-slide piles (1) are arranged along the inner side roadbed at designed intervals, upper anchor cables (2) are arranged on the inner side anti-slide piles for further reinforcing a mountain, and upper soil retaining plates (3) and inner side connecting beams (4) are arranged between the inner side anti-slide piles (1); the upper roadbed structure mainly comprises a cross beam (5), a pavement slab (6) and an upper anti-collision guardrail (8), wherein the cross beam (5) is rigidly connected with an inner side anti-slide pile (1) and an outer side anti-slide pile (9), the pavement slab (6) is arranged on the cross beam (5), the pavement slab (6) is flush with the edge of the cross beam (5), the upper anti-collision guardrail (8) is arranged on the outer edge of the pavement slab (6), and the outer side connecting beam (7) is arranged on the outer side of the cross beam (5) to increase the longitudinal rigidity of the structure; outer anti-slide piles (9) are arranged on the inner side of the lower roadbed structure according to a design interval, lower anchor rods (14) are arranged on the outer anti-slide piles for preventing over-large vertical deformation, and lower soil retaining plates (10) are arranged between the outer anti-slide piles (9); a side ditch (13) is arranged on the inner side of the roadbed structure (12), and a lower anti-collision guardrail (11) is arranged on the outer side of the roadbed structure.

The upper roadbed structure has a part which overlaps the lower roadbed structure on the plane, and the cross beam (5) and the part of the pavement slab (6) and the upper anti-collision guardrail (8) are cantilevered on the lower roadbed structure.

The longitudinal distance between the inner side anti-slide pile (1) and the outer side anti-slide pile (9) is preferably 5-8 m, the overhanging length of the cross beam (5) is not too large, and the reasonable overhanging ratio is preferably 1/4-1/3.

The cross beam (5) is a rectangular variable cross-section reinforced concrete structural member, the concrete strength grade is not less than C40, and a prestressed reinforced concrete structure is preferably adopted for design; the inner anti-slide pile (1), the upper soil retaining plate (3), the inner connecting beam (4), the outer connecting beam (7), the outer anti-slide pile (9), the lower soil retaining plate (10) and the side ditch (13) are structural components of reinforced concrete with rectangular cross sections, and the concrete strength grade is not less than C30; the upper anti-collision guardrail (8) and the lower anti-collision guardrail (11) are reinforced concrete structural members with polygonal cross sections, and the concrete strength grade is not less than C30; the road slab (6) is a reinforced concrete structural member with a rectangular cross section, and the concrete strength grade is not less than C40; the roadbed structure (12) is designed according to the relevant roadbed design specifications; and the upper anchor cable (2) and the lower anchor rod (14) are subjected to parameter design according to relevant design specifications.

The outer side of the lower roadbed structure can adopt a natural slope meeting the standard requirements under the condition that the conditions allow, and other retaining structures can also be adopted for slope reinforcement design, such as constant-weight retaining wall structures and the like, so that the disturbance range of the roadbed structure to the mountain is further reduced.

The inner side slide-resistant piles (1), the outer side slide-resistant piles (9) and the cross beams (5) are preferably in the same cross section; each 20-30m of the structure is an independent structure section along the longitudinal direction, and structural seams are arranged among the sections according to requirements; when the structure is used for a straight line section, the distances among the inner side anti-slide piles (1), the outer side anti-slide piles (9) and the cross beams (5) are reasonably set according to the length of the line; when the structure is used for a curve section, the distances among the inner side anti-slide piles (1), the outer side anti-slide piles (9) and the cross beams (5) are adjusted, so that a plurality of structure sections are combined into a folded form on a plane to adapt to the road width of the curve section; the elevation change of the pile top ground surface is adapted by adjusting the cantilever length of the inner side slide-resistant pile (1) and the outer side slide-resistant pile (9) and the parameters of the upper anchor cable (2) and the lower anchor rod (14).

A chamfer angle can be arranged at the junction of the lower part of the cross beam (5) and the inner side slide-resistant pile (1) so as to reduce the stress concentration of the junction area.

Due to the adoption of the technical scheme, the invention has the following advantages:

according to the mountain-climbing separated roadbed structure form with the partially-overlapped plane, the upper roadbed structure is organically combined and innovated through various structure forms, and the overhanging design is carried out on the upper roadbed structure, so that the upper and lower lanes are partially overlapped on the plane, the disturbance range of the separated roadbed structure on a mountain body is further reduced, and the environmental influence is reduced.

According to the separated subgrade structure form with the partially overlapped mountains on the plane, through organic combination and innovation of various structure forms, the separated subgrade structure form has the functions of mountain anchoring, side slope retaining and the like besides the double-layer driving function, further improves the reinforcing effect of the structure on mountain side slopes, and has good stability and applicability.

Drawings

FIG. 1 is a three-dimensional view of the integral roadbed structure according to the invention

FIG. 2 is a cross-sectional view of the integral roadbed structure according to the present invention

FIG. 3 is a side elevation view of the integrated roadbed supporting structure of the present invention

FIG. 4 is a cross-sectional view of the roadbed supporting structure of the present invention

FIG. 5 is a top view of the roadbed supporting structure A-A of the present invention

FIG. 6A top view of the roadbed supporting structure B-B

FIG. 7 is a sectional elevation view of a roadbed supporting structure C-C

FIG. 8 is a D-D sectional elevation view of the roadbed supporting structure of the present invention

In the figure: 1-inner side slide-resistant pile, 2-upper anchor cable, 3-upper soil retaining plate, 4-inner side connecting beam, 5-cross beam, 6-road plate, 7-outer side connecting beam, 8-upper anti-collision guardrail, 9-outer side slide-resistant pile, 10-lower soil retaining plate, 11-lower anti-collision guardrail, 12-roadbed structure, 13-side ditch, 14-lower anchor rod and 15-mountain body.

Detailed Description

Example 1

The following detailed description of the embodiments of the present invention will be given in conjunction with the accompanying drawings to make it clear to those skilled in the art how to practice the present invention. While the invention has been described in connection with preferred embodiments thereof, these embodiments are merely illustrative, and not restrictive, of the scope of the invention.

Referring to fig. 1 to 8, a separated roadbed structure with partially overlapped mountains on the plane comprises inner anti-slide piles 1, upper anchor cables 2, upper soil retaining plates 3, inner connecting beams 4, cross beams 5, road surface plates 6, outer connecting beams 7, upper anti-collision guardrails 8, outer anti-slide piles 9, lower soil retaining plates 10, lower anti-collision guardrails 11, roadbed structures 12, side ditches 13 and lower anchor rods 14.

The above components are generally reinforced concrete structures and prestressed printed concrete structures, and the detailed designs of the components, such as specific structures, dimensions, reinforcing bars and the like, should be calculated and determined according to actual conditions and relevant specification requirements.

A highway in a certain mountain area is built on a slope with a steep transverse slope on the ground, the soil body of the slope is a steep slope of 40 degrees, a high-low separation type roadbed is built, the allowable bearing capacity of a soil foundation is between 500 plus 650kpa, and the mountain-bypassing separation type roadbed structure form with partially overlapped planes is supposed to be adopted.

According to the roadbed structure scheme, the construction method from inside to outside and from top to bottom is adopted, mountain excavation is carried out from underground excavation to distributed open excavation and is carried out alternately with structure construction, so that the stability of a mountain and a structure can be ensured, and the disturbance to the natural environment can be reduced. The specific implementation method comprises the following steps:

firstly, the ground surface is excavated manually downwards to the pile bottom elevation of the designed inner side slide-resistant pile 1 by adopting a subsurface excavation method, the inner side slide-resistant pile 1 adopts a rectangular cross section, pile body anchor cable holes are poured and reserved, and a plurality of vertical side-by-side inner side slide-resistant pile 1 pile body concretes are poured along the inner side of a roadbed structure.

After the strength of the pile body concrete of the inner side anti-slide pile 1 reaches the design strength, digging out pile front mountain soil in the range of the upper anchor rope 2, drilling an anchor rope hole to a pile rear mountain through an anchor rope reserved hole of the upper cantilever section, then installing the upper anchor rope 2, pouring high-strength cement mortar to the deep part of the anchor rope hole, anchoring the tail section of the anchor rope and the mountain together, and then carrying out prestress tensioning on the upper anchor rope 2 to lock the upper anchor rope 2 on the inner side anti-slide pile 1 by using an external anchorage device.

Excavating an outer mountain to 9 pile top elevations of outer side anti-slide piles, installing upper soil retaining plates 3 and pouring inner side connecting beams 4 according to requirements in the process, waiting for the construction of an upper supporting structure to be completed, continuously adopting a subsurface excavation method to excavate downwards to 9 pile bottom elevations of the designed outer side anti-slide piles by the earth surface, adopting rectangular cross sections for the outer side anti-slide piles 9, pouring and reserving pile body anchor cable holes, and pouring a plurality of vertical side-by-side outer side anti-slide piles 9 pile body concretes along the inner side of a lower roadbed structure.

After the strength of the concrete of the pile body of the anti-slide pile 9 on the outer side reaches the design strength, formwork pouring or assembling is carried out on the cross beam 5, the road surface plate 6, the connecting beam 7 on the outer side and the anti-collision guardrail 8 on the upper portion, wherein the cross beam 5 is of a variable cross-section prestressed concrete structure, prestress tensioning is carried out by adopting a post-tensioning method, and the road surface plate 6 adopts a construction mode of factory prefabrication and field assembling.

And after the construction of the upper roadbed structure is completed, excavating pile front mountain bodies in the range of the lower anchor rods 14, mounting the lower anchor rods 14 and the lower soil retaining plates 10 until the design elevation of the lower roadbed structure, and completing the construction of the lower anti-collision guardrail 11, the roadbed structure 12 and the side ditches 13.

Claims

1. A side-mountain separated roadbed structure partially overlapped on a plane, characterized in that: comprising an inner anti-sliding pile (1), an upper anchor cable (2), an upper retaining plate (3), an inner connecting beam (4) ), cross beam (5), road deck (6), outer connecting beam (7), upper anti-collision guardrail (8), outer anti-sliding pile (9), lower earth retaining plate (10), lower collision guardrail ( 11), subgrade structure (12), side ditch (13), lower anchor rod (14); the plurality of inner anti-sliding piles (1) are arranged along the inner subgrade according to the designed spacing, and upper anchor cables (2) are arranged thereon ) to further improve the supporting and reinforcing effect of the structure on the slope, the upper retaining plate (3) and the inner connecting beam (4) are arranged between the inner anti-sliding piles (1); the upper subgrade structure is mainly composed of cross beams (5), road The panel (6) and the upper crash barrier (8) are composed, the beam (5) is rigidly connected with the inner anti-sliding pile (1) and the outer anti-sliding pile (9), and the road surface (6) is placed on the beam (5) Above, the road panel (6) is flush with the edge of the beam (5), and an upper crash barrier (8) is arranged on the outer edge of the road panel (6), and an outer connecting beam (8) is arranged on the outer side of the beam (5). 7) Increase the longitudinal stiffness of the structure; the inner side of the lower subgrade structure is arranged with outer anti-sliding piles (9) according to the design spacing, and the lower anchor rods (14) are arranged on it to prevent excessive vertical deformation, and the outer anti-sliding piles (9) A lower earth retaining plate (10) is arranged therebetween; a side ditch (13) is arranged on the inner side of the roadbed structure (12), and a lower anti-collision guardrail (11) is arranged on the outer side.

2. The mountain-side separated roadbed structure partially overlapped on a plane according to claim 1, characterized in that: the upper roadbed structure has a part overlapping with the lower roadbed structure on the plane, and the beam (5) is connected to the road surface. Part (6) and the upper crash barrier (8) cantilever above the lower subgrade structure.

3. A kind of side-mountain separated roadbed structure partially overlapping on a plane according to claim 1, is characterized in that: the longitudinal spacing of inner anti-sliding pile (1) and outer anti-sliding pile (9) is 5-8 meters, The overhang ratio of the beam (5) ranges from 1/4 to 1/3.

4. a kind of side-mountain separated roadbed structure partially overlapped on a plane according to claim 1, is characterized in that: the cross beam (5) is a rectangular variable-section reinforced concrete structural member, concrete strength grade≧C40, adopts prestressed steel bar The concrete structure is designed; inner anti-sliding pile (1), upper retaining plate (3), inner connecting beam (4), outer connecting beam (7), outer anti-sliding pile (9), lower retaining plate ( 10) The side ditch (13) is a reinforced concrete structural member with a rectangular section, and the concrete strength grade is ≧C30; the upper collision guardrail (8) and the lower collision guardrail (11) are polygonal section reinforced concrete structural members, and the concrete strength grade is ≥C30 The road surface (6) is a reinforced concrete structural member with a rectangular section, and the concrete strength grade is ≧C40; the roadbed structure (12) is designed according to the relevant roadbed design specifications; the upper anchor cable (2) and the lower anchor rod (14) are designed according to the relevant design specifications. Specification for parametric design.

5. The mountain-side separated roadbed structure partially overlapping on a plane according to claim 1, characterized in that: the outer side of the lower roadbed structure adopts a natural grading that meets the requirements of the specification when conditions permit, and adopts its balance. The heavy retaining wall structure reduces the disturbance range of the subgrade structure to the mountain.

6. The partially overlapping mountainside separated roadbed structure on a plane according to claim 1, characterized in that: the inner anti-sliding pile (1), the outer anti-sliding pile (9), and the beam (5) are in the same cross section. In-plane; the structure is an independent structural section every 20-30m in the longitudinal direction, and structural joints are arranged between the sections as required; when the structure is used for a straight road section, the inner anti-sliding piles (1) and the outer The distance between the anti-sliding piles (9) and the beams (5); when the structure is used in a curved road section, adjust the distance between the inner anti-sliding piles (1), the outer anti-sliding piles (9), and the beams (5) to make multiple structures The sections are combined into a broken line on the plane to adapt to the road width of the curved section; by adjusting the cantilever length of the inner anti-sliding pile (1), the outer anti-sliding pile (9) and the length of the upper anchor cable (2) and the lower anchor rod (14) parameters to adapt to changes in the elevation of the pile top surface.

7. The mountain-side split roadbed structure partially overlapping on a plane according to claim 1, characterized in that: a chamfer is set at the lower junction of the cross beam (5) and the inner anti-sliding pile (1) to reduce the junction area of stress concentration.