CN112681043B - Roadbed splicing widening structure and construction method - Google Patents
Roadbed splicing widening structure and construction method Download PDFInfo
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- CN112681043B CN112681043B CN202011503519.3A CN202011503519A CN112681043B CN 112681043 B CN112681043 B CN 112681043B CN 202011503519 A CN202011503519 A CN 202011503519A CN 112681043 B CN112681043 B CN 112681043B
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Abstract
The invention relates to a roadbed splicing and widening structure, which comprises a permeable pavement layer, a new roadbed transition section, an old roadbed transition section, a permeable graded layer and a permeable pavement layer; the new and old roadbed transition section is arranged at the splicing position of the roadbeds, the new and old roadbed transition section is fixedly connected with the original roadbed through anchor bars arranged in the leading holes, vertical water channels are arranged in the new and old roadbed transition section at intervals, and inner side piles and outer side piles are arranged below the new and old roadbed transition section at intervals; the permeable graded layer is arranged below the vertical water channel and between the inner pile and the outer pile along the longitudinal through length of the roadbed, and the bottom of one side, close to the outer pile, of the permeable graded layer is connected with one end of the transverse drainage blind ditch arranged at intervals. The beneficial effects of the invention are: the invention adopts the irregular transition section of the new and old roadbed to effectively reduce the dead weight and the cost, adopts the anchor bars to be tightly connected with the original roadbed, and has the pile foundation at the bottom, stable structure, effective prevention of settlement displacement, strong integrity and obvious economic and technical benefits.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to a roadbed splicing widening structure and a construction method.
Background
In recent years, with the economic soaring of China, urban construction and rural construction are unprecedented, and matched traffic networks are developed increasingly. In order to cope with the increasing traffic volume, the previously constructed roads need to be rebuilt or upgraded. In order to save cost, the reconstruction of the relatively intact road section of the original road is implemented by adopting the design and implementation scheme of widening and reconstructing the old road.
The highway engineering is divided into two important components of a roadbed and a pavement, wherein the roadbed is a main bearing structure, the driving load and the lane load of the pavement of the highway are transmitted to the roadbed by an equal line and then transmitted to an underground bearing layer by the roadbed, and therefore the roadbed is required to have enough strength, rigidity and stability. Because the new and old roadbed joint parts have the problems of difference of road construction time, settlement difference, difference of foundation bearing capacity under different geological conditions and the like, the phenomena of cracks, damages, height difference, driving discomfort and the like at the joint parts can be caused, the safety of highways is influenced, and the service level is reduced. The construction of the splicing part of the existing new and old roadbeds usually adopts measures of excavating steps, arranging geogrids, strengthening new roadbed foundation treatment and the like. Although uneven settlement and deformation can be reduced to a certain extent, the effect is not ideal, and once rainy days are met, rainwater can permeate into the roadbed, so that the old roadbed is damaged, and the diseases can be aggravated in serious conditions.
Therefore, at present, it is important to find a roadbed splicing widening structure and a construction method which have stable structure, strong integrity, and prevention and drainage combination and effectively prevent the water from corroding the roadbed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a roadbed splicing and widening structure and a construction method.
The spliced and widened structure of the roadbed comprises a permeable pavement layer, a transition section of a new roadbed and an old roadbed, a permeable grading layer and a permeable pavement layer; the new and old roadbed transition section is arranged at the splicing position of the roadbeds, the new and old roadbed transition section is fixedly connected with the original roadbed through anchor bars arranged in the leading holes, vertical water channels are arranged in the new and old roadbed transition section at intervals, and inner side piles and outer side piles are arranged below the new and old roadbed transition section at intervals; the permeable grading layer is arranged below the vertical water channel and between the inner pile and the outer pile along the longitudinal channel length of the roadbed, the bottom of one side, close to the outer pile, of the permeable grading layer is connected with one end of a transverse drainage blind ditch arranged at intervals, the other end of the transverse drainage blind ditch is connected with an external drainage system, and bottom surface waterproof layers are arranged at the bottoms of the permeable grading layer and the transverse drainage blind ditch; the road surface layer that permeates water sets up in new and old road bed changeover portion top to link to each other with former road surface layer and newly-built ordinary road surface layer, ordinary road surface layer below is equipped with the impervious blanket, the impervious blanket below is equipped with backfills the compaction layer, backfill compaction layer inside is equipped with geogrid and adds the muscle layer, and geogrid adds the muscle layer and is equipped with the side waterproof layer between the side slope of backfilling compaction layer side.
Preferably, the method comprises the following steps: the new roadbed transition section and the old roadbed transition section are of a cast-in-place reinforced concrete structure and are in reverse step lap joint with the original roadbed.
Preferably, the method comprises the following steps: the inner side pile and the outer side pile are prefabricated reinforced concrete piles.
Preferably, the method comprises the following steps: the bottom surface waterproof layer and the side surface waterproof layer are waterproof layers combined by rigid and flexible materials.
The construction method for the spliced and widened structure of the roadbed comprises the following steps of:
1) before construction, the surface soil, vegetation, tree roots and other construction wastes of the original roadbed slope are cleaned, and the soil is thoroughly cleaned along the primary side slope; adopting an excavator to cut slopes of the original old road shoulder slopes at the combined parts, vertically cutting to the designed elevation of the foundation, and then driving inner side piles and outer side piles which are parallel to each other at intervals along the sections of the original roadbed;
2) meanwhile, constructing reverse soil steps on the original roadbed section, forming guide holes on the steps by using a drilling machine for installing anchor bars, binding the reinforcing steel bars of the transition section of the new roadbed and the old roadbed, overlapping and binding the anchor bars, the reinforcing steel bars at the tops of the inner side piles and the outer side piles together, embedding vertical water channels in a reinforcing steel bar net, erecting a template, and pouring concrete to form the transition section of the new roadbed and the old roadbed;
3) paving a construction bottom waterproof layer on the foundation part of the ground, finally backfilling graded broken stones between the inner side pile and the outer side pile to the top of the inner side pile, and compacting to form a permeable graded layer; installing transverse drainage blind ditches at intervals on one side of the permeable graded layer close to the outer side pile, and connecting the outer ends of the transverse drainage blind ditches with an external drainage system;
4) backfilling and compacting the roadbed filling in layers to form a backfilled and compacted layer; after the height of the backfilled compacted layer reaches the top of the permeable graded layer, fixedly laying a geogrid reinforced layer by using U-shaped nails, and fixedly connecting one side of the geogrid reinforced layer with the transition section of the new roadbed and the old roadbed by using anchoring nails; arranging one or more geogrid reinforced rib layers inside the backfilling compaction layer according to the height of the roadbed; after the height of the backfilled compacted layer reaches a design value, slope cutting is carried out on the side face of the roadbed, a side waterproof layer is laid and constructed to be in lap joint with a bottom waterproof layer, a waterproof layer is constructed on the top face of the backfilled compacted layer to be in lap joint with the side waterproof layer, and then the side slope is backfilled and constructed on the side face of the backfilled compacted layer;
5) building a section of permeable pavement layer with a through length above the transition section of the new and old roadbed, constructing other pavement layers by adopting common pavement layers, and making water stopping measures among the original pavement layer, the permeable pavement layer and the common pavement layer to finally finish the construction of the spliced and widened structure of the roadbed.
The invention has the beneficial effects that:
1. compared with the prior art, the roadbed splicing widening structure is provided with the drainage system combining underground water prevention and drainage and surface drainage, the waterproof layer in the foundation can effectively prevent accumulated water from entering the roadbed, the arranged vertical water through and permeable graded layer is matched with the transverse drainage blind ditch, the accumulated water in the foundation can be effectively and quickly drained, and the technical advantage is obvious.
2. The invention adopts the irregular transition section of the new and old roadbeds to effectively reduce the dead weight and the cost, adopts the anchor bars to be tightly connected with the original roadbeds, and has the pile foundation at the bottom, stable structure, effective prevention of settlement displacement, strong integrity and obvious economic and technical benefits.
3. The geogrid reinforcing rib layer provided by the invention has the advantages of higher tensile strength, lower elongation, difficult deformation and the like, and can be easily and comprehensively connected with a soil body, so that the friction between the geogrid reinforcing rib layer and the soil body can be increased, the soil body can be prevented from lateral displacement, and in addition, geogrid grids and coarse particle fillers can be effectively combined together, so that the roadbed bearing capacity and the stability can be improved to the maximum extent.
Drawings
FIG. 1 is a schematic illustration of a roadbed splicing widening structure;
FIG. 2 is a layout of inboard and outboard piles;
FIG. 3 is a top view of FIG. 2;
fig. 4 is a schematic diagram of a new and old roadbed transition section;
FIG. 5 is a layout view of a water drain prevention system;
FIG. 6 is a schematic illustration of backfilling a compacted layer.
Description of reference numerals: 1-original roadbed; 2-original pavement layer; 3-permeable pavement layer; 4, vertical water through; 5-ordinary pavement layer; 6-impermeable layer; 7-leading hole; 8-anchor bar; 9-new and old roadbed transition section; 10-water permeable graded layer; 11-inside pile; 12-outer side pile; 13-bottom waterproof layer; 14-horizontal drainage blind ditch; 15-backfilling the compacted layer; 16-geogrid reinforcement layer; 17-side waterproof layer.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
The roadbed splicing and widening structure comprises a new and old roadbed transition section 9 with a through length arranged at a roadbed splicing position, anchor bars 8 are arranged through leading holes 7 and fixedly connected with an original roadbed 1, vertical water passages 4 are arranged inside the new and old roadbed transition section 9 at intervals, and inner side piles 11 and outer side piles 12 are arranged below the new and old roadbed transition section at intervals; the water-permeable grading layer 10 is arranged below the vertical water channel 4 and between the inner pile and the outer pile along the longitudinal through length of the roadbed, the bottom of one side close to the outer pile 12 is connected with transverse drainage blind ditches 14 arranged at intervals, the other ends of the transverse drainage blind ditches 14 are connected with an external drainage system, and bottom surface waterproof layers 13 are arranged at the bottoms of the water-permeable grading layer 10 and the transverse drainage blind ditches 14; set up in the permeable pavement layer 3 of new and old road bed changeover portion 9 top to link to each other and make waterproofly with former road bed layer 2 and newly-built ordinary road bed layer 5, ordinary road bed layer 5 below is equipped with impervious bed 6, impervious bed 6 below is equipped with backfill compaction layer 15, backfill compaction layer 15 inside is equipped with geogrid and adds muscle layer 16, and be equipped with side waterproof layer 17 between the side slope 18.
The new roadbed transition section 9 and the old roadbed transition section are of a cast-in-place reinforced concrete structure and are in reverse step lap joint with the original roadbed 1.
The inner pile 11 and the outer pile 12 are prefabricated reinforced concrete piles.
The bottom waterproof layer 13 and the side waterproof layer 17 are waterproof layers combined by rigid and flexible materials.
Example two
The construction method of the roadbed splicing widened structure comprises the following steps:
1) as shown in fig. 2 and 3, before construction, the surface floating soil, vegetation, tree roots and other construction waste of the original roadbed 1 side slope are cleaned up, and the floating soil along the original side slope is thoroughly cleaned up. And (3) cutting the slope of the original old road shoulder slope at the joint part by adopting an excavator, vertically cutting to the designed elevation of the foundation, and then alternately arranging inner side piles 11 and outer side piles 12 which are parallel to each other along the section of the original road bed 1.
2) As shown in fig. 4, reverse soil steps are built on the section of the original roadbed 1, a drilling machine is used for forming guide holes 7 on the steps for installing anchor bars 8, then steel bars of the transition section 9 of the new roadbed and the old roadbed are bound, the anchor bars 8, the top steel bars of the inner side piles 11 and the outer side piles 12 are overlapped and bound together, the vertical water channels 4 are embedded and installed in a steel bar mesh, templates are erected, and concrete is poured to form the transition section 9 of the new roadbed and the old roadbed.
3) As shown in fig. 5, a construction bottom waterproof layer 13 is laid on the ground base part, and finally graded gravel is backfilled between the inner pile 11 and the outer pile 12 to the top of the inner pile 11 and compacted to form a water permeable graded layer 10. And (3) installing transverse drainage blind ditches 14 at intervals on one side of the permeable graded layer 10 close to the outer side piles 12, and connecting the other ends of the transverse drainage blind ditches 14 with an external drainage system.
4) As shown in fig. 6, the backfill compacting the subgrade filler in layers forms a backfill compacted layer 15. And after the height of the backfilled compacted layer 15 reaches the top of the permeable graded layer 10, fixedly laying a geogrid reinforcing layer 16 by using U-shaped nails, and fixedly connecting one side of the geogrid with the new and old roadbed transition section 9 by using anchoring nails. One or more geogrid reinforcement layers 16 can be arranged on the backfill compaction layer 15 according to the height of the roadbed. And after the height of the backfill compacted layer 15 reaches a design value, slope cutting is carried out on the side face of the roadbed, the side face waterproof layer 17 and the bottom face waterproof layer 13 are paved and constructed in an overlapping mode, the waterproof layer 6 and the side face waterproof layer 17 are constructed on the top face of the backfill compacted layer 15 in an overlapping mode, and then the side slope 18 is backfilled and constructed.
5) As shown in fig. 1, a water permeable pavement layer 3 with a length of the whole is built above the transition section 9 of the old and new roadbed close to the side of the original pavement layer 2, the rest of the pavement layers are all constructed by adopting the common pavement layer 5, water stopping measures are made among the original pavement layer 2, the water permeable pavement layer 3 and the common pavement layer 5, and finally the construction of the spliced and widened structure of the roadbed is completed.
Claims (3)
1. The utility model provides a structure is widened in road bed concatenation which characterized in that: comprises a permeable pavement layer (3), a new roadbed transition section (9), a permeable graded layer (10) and a permeable pavement layer (3); the new and old roadbed transition section (9) is arranged at a roadbed splicing position in a through-length mode, the new and old roadbed transition section (9) is fixedly connected with an original roadbed (1) through anchor bars (8) arranged in guide holes (7), vertical water channels (4) are arranged in the new and old roadbed transition section (9) at intervals, inner side piles (11) and outer side piles (12) are arranged below the new and old roadbed transition section (9) at intervals, and the inner side piles (11) and the outer side piles (12) are prefabricated reinforced concrete piles; the new roadbed transition section (9) and the old roadbed transition section are of a cast-in-place reinforced concrete structure and are in reverse step lap joint with the original roadbed (1); the permeable grading layer (10) is arranged below the vertical water channel (4) and between the inner pile and the outer pile along the longitudinal through length of the roadbed, the bottom of one side, close to the outer pile (12), of the permeable grading layer (10) is connected with one end of a transverse drainage blind ditch (14) which is arranged at intervals, the other end of the transverse drainage blind ditch (14) is connected with an external drainage system, and bottom waterproof layers (13) are arranged at the bottoms of the permeable grading layer (10) and the transverse drainage blind ditch (14); road surface layer (3) of permeating water sets up in old and new road bed changeover portion (9) top to link to each other with former road surface layer (2) and newly-built ordinary road surface layer (5), ordinary road surface layer (5) below is equipped with impervious bed (6), impervious bed (6) below is equipped with backfills compact layer (15), backfills compact layer (15) inside and is equipped with geogrid and adds muscle layer (16), and geogrid adds muscle layer (16) and is equipped with side waterproof layer (17) between slope (18) of backfilling compact layer (15) side.
2. The roadbed splicing and widening structure of claim 1, wherein: the bottom waterproof layer (13) and the side waterproof layer (17) are waterproof layers combined by rigid and flexible materials.
3. The construction method for the roadbed splicing widened structure based on the claim 1 is characterized by comprising the following steps:
1) before construction, the surface of the side slope of the original roadbed (1) is cleaned up with the floating soil, vegetation, tree roots and other construction waste, and the floating soil is thoroughly cleaned along the primary side slope; cutting slopes of original old road shoulder slopes at the combination parts by adopting an excavator, vertically cutting to a designed elevation of a foundation, and then alternately driving inner side piles (11) and outer side piles (12) which are parallel to each other along the section of the original road bed (1);
2) meanwhile, constructing reverse soil steps on the section of the original roadbed (1), arranging guide holes (7) on the steps by using a drilling machine for installing anchor bars (8), binding steel bars of the transition section (9) of the new roadbed and the old roadbed, overlapping and binding the anchor bars (8) and top steel bars of the inner side pile (11) and the outer side pile (12), embedding and installing vertical water channels (4) in a steel bar net, erecting a template, and pouring concrete to form the transition section (9) of the new roadbed and the old roadbed;
3) paving a construction bottom surface waterproof layer (13) on the foundation part of the ground, finally backfilling graded broken stones between the inner side pile (11) and the outer side pile (12) to the top of the inner side pile (11) and compacting to form a permeable graded layer (10); arranging transverse drainage blind ditches (14) at intervals on one side of the permeable graded layer (10) close to the outer side pile (12), and connecting the outer ends of the transverse drainage blind ditches (14) with an external drainage system;
4) backfilling and compacting the roadbed filling in layers to form a backfilled and compacted layer (15); after the height of the backfilled compacted layer (15) reaches the top of the permeable graded layer (10), a geogrid reinforcement layer (16) is fixedly laid by using U-shaped nails, and one side of the geogrid reinforcement layer (16) is fixedly connected with a transition section (9) of a new roadbed and an old roadbed by using anchoring nails; one or more geogrid reinforced rib layers (16) are arranged inside the backfill compaction layer (15) according to the height of the roadbed; after the height of the backfill compaction layer (15) reaches a design value, slope cutting is carried out on the side face of the roadbed, a side face waterproof layer (17) is laid and constructed to be in lap joint with a bottom face waterproof layer (13), a waterproof layer (6) is constructed on the top face of the backfill compaction layer (15) to be in lap joint with the side face waterproof layer (17), and then a side slope (18) is backfilled and constructed on the side edge of the backfill compaction layer (15);
5) building a water permeable pavement layer (3) with a length reaching the original pavement layer (2) side above the transition section (9) of the new and old roadbeds, constructing other pavement layers by adopting a common pavement layer (5), and making water stopping measures among the original pavement layer (2), the water permeable pavement layer (3) and the common pavement layer (5) to finally finish the construction of splicing and widening the structure of the roadbeds.
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| CN113308956B (en) * | 2021-05-17 | 2023-03-28 | 浙大城市学院 | Construction method of pile-supported anchor rod foam concrete embankment structure |
| CN113389150B (en) * | 2021-07-22 | 2022-08-09 | 山东省交通规划设计院集团有限公司 | Highway reconstruction and extension construction method for expanded bridge road section |
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Denomination of invention: Structure and Construction Method for Widening Roadbed Splicing Effective date of registration: 20230927 Granted publication date: 20220823 Pledgee: Industrial Bank Limited by Share Ltd. Wuhan branch Pledgor: HUBEI PROVINCIAL ROAD & BRIDGE Co.,Ltd. Registration number: Y2023980059401 |