CN218508149U

CN218508149U - Road subgrade structure near river in steep mountain area

Info

Publication number: CN218508149U
Application number: CN202222615207.2U
Authority: CN
Inventors: 吴平; 张满彪; 童景盛; 黄显德; 贾雯丽; 苏蕊
Original assignee: CSCEC Aecom Consultant Co Ltd
Current assignee: CSCEC Aecom Consultant Co Ltd
Priority date: 2022-10-01
Filing date: 2022-10-01
Publication date: 2023-02-21
Anticipated expiration: 2032-10-01

Abstract

The utility model discloses a precipitous mountain area road roadbed structure near the river belongs to road building engineering field, has solved the high problem of filling out deeply digging, destroying ecological environment, engineering investment height, encroaching on the river course that current mountain area road transformation method exists. The utility model discloses a road base plate, road base plate are rebuild on the road bed rock mass between cliff and river course, are equipped with the cantilever beam arm in road base plate's side of facing the river, and the cantilever beam arm is even as an organic whole with the road base plate, link up inside being equipped with of road base plate and cantilever beam arm and link up the reinforcing bar net piece, and road base plate faces the mountain side bottom and is equipped with the road bed and strengthens the stock, and the road bed is strengthened stock upper end and is linked to each other with link up the reinforcing bar net piece, and the road bed is strengthened stock lower extreme embedding road bed rock mass. The utility model discloses complement the road with the cantilever beam arm structure and lack wide part, when the minimize was destroyed natural ecological environment, it was minimum to original side slope disturbance during road construction, maintained the self stability of side slope, and it is convenient to be under construction, has saved the engineering investment to do not encroach on the flood passage, to the flood safety nothing influence.

Description

Road subgrade structure near river in steep mountain area

Technical Field

The utility model belongs to road building engineering field, concretely relates to precipitous mountain area road roadbed structure near the river.

Background

With the development of social economy and the prosperity of tourism, a plurality of mountainous area roads and road plans cannot meet the use requirements. The construction of mountain roads is a difficult problem in building engineering, especially the construction of a road near the river in a steep mountain area is difficult and serious, and the rapid development of social economy is seriously restricted by the original low-grade mountain roads or tourist roads, so that new roads need to be built or the existing mountain roads need to be rebuilt and expanded.

In the prior art, newly building or widening and modifying mountain roads generally adopts slope cutting and widening at a mountain side, building retaining walls and widening at a river side, replacing river subgrades with tunnels, replacing roads with bridges and the like. The method for cutting the slope on the side of the backer has the following defects for building or widening roads in steep sections: the slope cutting height is large, the engineering quantity is large, the investment is high, and the natural ecological environment is damaged due to disasters such as new collapse, new landslide and the like caused by the original stable inner side slope. The method for building the retaining wall has the following disadvantages for building or widening roads in steep sections although the process is simple: the height of the retaining wall can reach tens of meters, the retaining wall needs to be built by staggering the platforms in a grading way when the retaining wall is too high, the quantity of masonry retaining wall projects is large, the excavation projects are large, the retaining wall occupies a river channel, influences flood safety or greatly damages natural stability of the original side slope, and if an anchor cable retaining wall scheme is adopted, the construction cost is high and the construction is difficult. Although the tunnel replaces the roadbed along the river and the bridge replaces the road, the tunnel avoids large-scale earth and stone engineering and has small influence on flood discharge of the river, but has the following defects: the construction investment is huge, the longitudinal slopes of the tunnel and bridge sections are limited, the elevation of mountainous roads is not favored, the length of the exhibition line is greatly increased, the operation and maintenance cost is increased, and the environment protection, energy conservation and the like are not favored.

Therefore, a newly-built or widened roadbed structure of the road is needed for a steep river-facing section of a mountainous area with better geological conditions, high filling and deep digging is reduced as much as possible, the natural ecological environment is maintained, the safety, reliability and durability of the road structure are ensured, the disturbance on the original side slope is minimum, the side slope is stable, the construction method is simple, and the construction cost is saved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a precipitous mountain area is road roadbed structure near the river to solve the high problem of filling deep digging, destruction ecological environment, engineering investment height, encroaching on the river course that current mountain area road transformation method exists.

The technical scheme of the utility model is that: the utility model provides a precipitous mountain area road roadbed structure near a river, includes the road bed board, the road bed board is built on the road bed rock mass between cliff and river course, is equipped with the cantilever beam arm near the river side of road bed board, the cantilever beam arm links as an organic wholely with the road bed board, link up road bed board and the inside reinforcing bar net piece that is equipped with of cantilever beam arm, the road bed board face mountain side bottom and be equipped with the road bed and strengthen the stock, the stock upper end is strengthened with link up the reinforcing bar net piece and link to each other to the road bed, cantilever beam bending resistance has greatly been improved, stock lower extreme embedding road bed rock mass is strengthened to the road bed.

As the utility model discloses a further improvement is equipped with the bracing between cantilever beam arm and the road bed rock mass, and the bracing provides ascending holding power for the cantilever beam to bear the vertical load on the cantilever beam jointly with the transverse reinforcement net piece of cantilever beam, greatly reduced the hogging moment of cantilever beam, ensured the cantilever length of cantilever beam and the necessary width that the road was widened.

As a further improvement, the through reinforcing mesh is provided with two layers.

As the utility model discloses a further improvement is equipped with the reinforcing bar net piece in the cantilever beam arm, and the reinforcing bar net piece extends into the road bed inboard, and the reinforcing bar net piece is located between the two-layer reinforcing bar net piece that link up.

As a further improvement, the utility model is provided with a drainage ditch between the road base plate and the cliff, and the water accumulation of the road base plate and the cantilever is avoided.

As a further improvement, the outer end of the suspension beam arm is provided with an anti-collision guardrail.

As a further improvement, the roadbed reinforced anchor rod is provided with two rows.

The utility model has the advantages that: the utility model discloses roadbed structure has stopped the height and has filled the deep digging, roadbed structure is built in whole in confirming the good roadbed within range of geological conditions, to the outstanding beam arm structure complements the road and owes wide part, ensure safety, reliable, it is durable, when the minimize is destroyed natural ecological environment, it is minimum to original side slope disturbance during road construction, maintain the self stability of side slope, it is convenient to construct, the engineering quantity has obviously been reduced, the engineering investment has greatly been saved, and do not invade and account for the flood passage, to the flood safety no influence, comprehensive technique, economy and social are showing.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

In the figure: 1-a drainage ditch; 2-roadbed reinforcing anchor rods; a 3-way substrate; 4-bracing; 5-cantilever beam arm; 6-anti-collision guard bar; 7-cliff; 8-river channel; 9-roadbed rock mass; 10-through reinforcing mesh; 11-reinforcing steel bar net piece.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

Example 1 is applicable to a case where the geological condition is a sandstone-favorable mountain.

As shown in fig. 1, a precipitous mountain region road roadbed structure near the river, including the roadbed board 3, the roadbed board 3 is built on the roadbed rock mass 9 between cliff 7 and river course 8, the side near the river of roadbed board 3 is equipped with cantilever beam arm 5, cantilever beam arm 5 links as an organic wholely with roadbed board 3, link up roadbed board 3 and cantilever beam arm 5 inside and be equipped with through steel bar net piece 10, the roadbed board 3 face the mountain side bottom be equipped with the road bed and strengthen stock 2, 2 upper ends of road bed reinforcement stock are closely linked to each other with through steel bar net piece 10, 2 lower extreme embedding roadbed rock masses 9 of road bed reinforcement stock.

The road base plate 3 is made of cast-in-place cement concrete, the thickness is 22-30 cm, and the bending tensile strength is not less than 5.0Mpa. Cantilever beam 5 encorbelments to the river course top, for the road widened part, undertakes simultaneously and widens body dead weight and vehicle load etc. provides effectual current space for road traffic. The cantilever beam 5 is also made of cement concrete, the bending tensile strength is not less than 10Mpa, and the concrete strength is not less than C50. The through reinforcing mesh 10 is arranged in the road base plate 3 and the cantilever beam 5, the ultimate compressive strength and the ultimate bending tensile strength of the through reinforcing mesh are greatly improved compared with those of a plain concrete plate, the fatigue resistance and crack resistance of the through reinforcing mesh are obviously superior to those of the plain concrete plate, the distance between contraction joints can be increased to 25-35 m, the distance between longitudinal joints can be increased to 8-15 m, and expansion joints can be omitted.

And an inclined strut 4 is arranged between the suspension beam arm 5 and the roadbed rock mass 9. The inclined strut 4 is made of reinforced concrete and is integrally cast with the cantilever beam 5, the angle between the inclined strut 4 and the cantilever beam 5 is set to be 15-45 degrees according to different widening widths, the bottom of the inclined strut 4 is embedded into the roadbed rock mass 9 for 1.5-2.0 m, and the elevation of the bottom of the inclined strut 4 needs to be higher than the flood level of a river channel 8. The bending tensile strength of the inclined strut 4 is not less than 10Mpa, and the strength of the concrete is not less than C50; the internal reinforcing steel bar of the inclined strut 4 is a twisted reinforcing steel bar with the diameter of 20-25 mm.

The through reinforcing mesh 10 is provided with two layers. The two layers of through reinforcing mesh sheets 10 are respectively close to the top and the bottom of the road base plate 3 and the cantilever beam 5, the upper layer of through reinforcing mesh sheets 10 is 3-5 cm away from the top of the road base plate 3 and the cantilever beam 5, and the lower layer of through reinforcing mesh sheets 10 is 3-5 cm away from the bottom of the road base plate 3 and the cantilever beam 5

Be equipped with reinforcing bar net piece 11 in the cantilever beam arm 5, reinforcing bar net piece 11 extends into way base plate 3, and reinforcing bar net piece 11 is located between two-layer link up reinforcing bar net piece 10. The reinforcing steel bar net piece 11 is arranged in the cantilever beam 5 in the whole range and extends into the road base plate 3 for 1.5-2.0 m.

The through reinforcing mesh 10 and the reinforcing mesh 11 are both made of threaded reinforcing steel bars arranged longitudinally and transversely.

A drainage ditch 1 is provided between the road base 3 and the cliff 7. On the basis of ensuring the water passing section, the drainage ditch 1 is set to be a narrow and deep structure as much as possible, so that the increased roadbed width is reduced, and the problem that the excavation scale and the protection engineering scale are greatly increased due to the increase of the roadbed width is avoided. The drainage ditch 1 is preferably 0.4-0.6 m wide and 0.8-1.5 m deep, and is made of C25 concrete, and the thickness of the side and the bottom is 0.2m.

And an anti-collision guardrail 6 is arranged at the outer end of the suspension beam arm 5. The anti-collision guardrail 6 adopts an HA reinforced concrete guardrail, the bottom reinforcing steel bars of the anti-collision guardrail 6 are connected with the through reinforcing steel bar net piece 10 and the reinforcing steel bar net piece 11 in the cantilever beam 5, the protection energy of the anti-collision guardrail 6 is improved, and the guarantee is improved for the safe operation of roads. The bottom reinforcing steel bar of the anti-collision guardrail 6 is a threaded reinforcing steel bar with the diameter of 12-16 mm, and the concrete strength of the anti-collision guardrail 6 is not less than C50.

The roadbed reinforcing anchor rods 2 are provided with two rows. Two rows of roadbed reinforcing anchor rods 2 are arranged along the length direction of the road and are staggered in position. The roadbed reinforcing anchor rods 2 adopt T-shaped anchor rods, the arrangement distance is 2.0-3.0 m, the diameter of each anchor rod is 50-80 mm, and the length of each anchor rod is 5.0-9.0 m.

Example 2, the method is suitable for the case that the geological condition is marble mountain.

This example differs from example 1 in that: due to good geological conditions, the inclined strut 4 of the cantilever beam 5 is not required to be arranged, as shown in figure 2, the stability of the natural slope is not influenced, the construction is more convenient and faster, and the investment is less.

Claims

1. The utility model provides a steep mountain area road roadbed structure near a river, includes the roadbed board, and the roadbed board is built on the road bed rock mass between cliff and river course, its characterized in that: be equipped with cantilever beam arm (5) in the side of facing the river of roadbed board (3), cantilever beam arm (5) link as an organic wholely with roadbed board (3), link up roadbed board (3) and cantilever beam arm (5) inside and be equipped with through reinforcement net piece (10), the side bottom of facing the mountain of roadbed board (3) is equipped with road bed and strengthens stock (2), road bed is strengthened stock (2) upper end and is linked to each other with through reinforcement net piece (10), road bed is strengthened stock (2) lower extreme embedding road bed rock mass (9).

2. The steep mountainous region riverside roadbed structure according to claim 1, wherein: and an inclined strut (4) is arranged between the suspension beam arm (5) and the roadbed rock mass (9).

3. A steep mountain riverside road subgrade structure according to claim 1 or 2, characterized in that: the through reinforcing mesh (10) is provided with two layers.

4. The steep mountainous region riverside road subgrade structure of claim 3, wherein: the suspension beam arm (5) is internally provided with a reinforcing steel bar net piece (11), the reinforcing steel bar net piece (11) extends into the road base plate (3), and the reinforcing steel bar net piece (11) is positioned between the two layers of through reinforcing steel bar net pieces (10).

5. The steep mountainous region riverside roadbed structure according to claim 4, wherein: a drainage ditch (1) is arranged between the road base plate (3) and the cliff (7).

6. The steep mountainous region riverside roadbed structure according to claim 5, wherein: an anti-collision guardrail (6) is arranged at the outer end of the suspension beam arm (5).

7. The steep mountainous region riverside roadbed structure according to claim 6, wherein: the roadbed reinforcing anchor rods (2) are arranged in two rows.