阅读说明：本技术 一种改扩建新老路拼接施工方法 (Splicing construction method for reconstructing and expanding new road and old road ) 是由 程兴旺 李茜 邵文泽 胡添元 石尊钰 吴曼 于 2019-10-11 设计创作，主要内容包括：本申请技术方案提供的一种改扩建新老路拼接施工方法,通过将台阶铣刨位置设置在原有道路行车道内侧10cm,避开轮迹带,车辆荷载作用下,能有效减少纵向裂缝,原有道路沥青层铣刨台阶宽45cm,铣刨原有道路二灰粒料形成宽25cm台阶,先期先保留原有道路灰土台阶,后期清除,与新建水稳共同摊铺,这样可以保证台阶完整性和灰土强度,将8m宽土工格栅沿着台阶向上折叠25cm,并用U型钉在台阶处固定折叠的土工格栅,能够整体提高拼宽路基的抗滑力和承载力。本申请提供的改扩建新老路拼接施工方法,减少了繁琐工艺,注重关键环节,降低施工难度,提高了新老路拼接质量,实现高效施工、质控稳定的目的,具有很好的实用性。(The utility model provides a reform and expand new and old road concatenation construction method, through milling the step position setting at original road lane inboard 10cm, avoid the wheel track area, under the vehicle load effect, can effectively reduce vertical crack, original road pitch layer mills and digs step width 45cm, mill and dig two grey aggregate formation wide 25cm steps of original road, earlier remain original road grey soil step, the later stage is clear away, with the steady spreading of newly-built water jointly, step integrality and grey soil intensity can be guaranteed like this, upwards fold 25cm with the wide geogrid of 8m along the step, and fix folding geogrid in step department with the U type nail, can wholly improve the skid resistance and the bearing capacity of piecing wide road bed. The construction method for reconstructing and expanding the new and old roads by splicing reduces a complex process, pays attention to key links, reduces construction difficulty, improves splicing quality of the new and old roads, achieves the purposes of high-efficiency construction and stable quality control, and has good practicability.)

1. A splicing construction method for reconstructing and expanding new and old roads is characterized by comprising the following steps:

processing the widened roadbed base and the original road side slope;

to the widened part subgrade basement and the original road side slope that handle, adopt the mode of the original road pavement of splitlevel excavation, accomplish the step concatenation of widened part subgrade basement and original road, the excavation mode includes: the step milling position is 10cm at the inner side of an original road lane, the step width of an original road asphalt layer milling step is 45cm, the secondary lime aggregate of the original road is milled to form a step with the width of 25cm, the original road lime soil step is reserved firstly, and is removed later and is paved together with newly-built water stably;

hydraulic tamping is adopted for the combination part of the widened roadbed base and the original road;

laying a layer of geogrid on the widened roadbed base and the bottom surfaces of the original road beds on and under the original road splicing position, wherein the geogrid is not spliced within the range of the transverse width of 8m, is fixed by U-shaped nails, 4 geogrids are used for each meter of width, the geogrid with the width of 8m is upwards folded for 25cm along the step, and the folded geogrid is fixed at the step by the U-shaped nails;

and carrying out pavement construction and face collection work on the road on which the geogrid is laid.

2. The splicing construction method for reconstructing the old and new roads according to claim 1, wherein the step of processing the widened roadbed base and the original road side slope comprises the following steps: the method is characterized in that the surface soil of a widened part of the roadbed pavement with the thickness of 30cm is cleaned, the surface soil, vegetation, tree roots and original pavement side ditches on the existing roadbed side slope are cleaned on the premise of keeping the roadbed stable by the original road side slope cleaning method.

3. The splicing construction method for reconstructing the old and new roads according to claim 1, wherein after the treatment of the widened roadbed base and the original road side slope, the construction method further comprises the following steps:

continuously over-digging 30cm of surface soil on the processed widened roadbed base, removing low-lying wet filling road sections which are easy to accumulate water, mixing 3% lime in situ in the rest road sections for backfilling, and replacing and filling gravel or old road masonry broken materials for backfilling the low-lying wet filling road sections which are easy to accumulate water; the original ground is placed in pits, holes and acupuncture points, after sediment is removed, fillers are used for backfill and compaction in a layered mode, after the foundation reaches the heavy compaction degree of 90%, a 25KJ impact road roller is used for rolling for 20 times, roadbed filling is started, the roadbed is compacted in a layered mode, and after the roadbed is finished, the side slope is trimmed.

4. The splicing construction method for reconstructing old and new roads according to claim 1, wherein the step splicing of the widened roadbed base and the original road is completed by excavating the original road surface in a staggered manner for the processed widened roadbed base and the original road side slope, and further comprising:

the step excavation line is accurately laid out before the step excavation, the vertical direction of the excavated step is required to be vertical downward, and the horizontal direction is provided with an inward inclined 2% cross slope.

5. The splicing construction method for reconstructing the old and new roads according to claim 1, wherein the step of tamping the joint of the roadbed base of the widened part and the original road by using hydraulic pressure comprises the following steps: the tamping position is in a range of 2m close to the step after every 1m of filling, the tamping times are not less than 3 times, or the tamping settlement difference of two adjacent times is less than 0.5cm, the tamping sequence is that the position far away from the step is a first point, the step is a second point, and the gap between the two points is a third point for construction.

6. The splicing construction method for reconstructing the old and new roads according to claim 1, wherein the geogrid is a two-way steel-plastic composite geogrid with the specification of GSZ80-80, the longitudinal and transverse ultimate tensile strength of each linear meter is 80KN/m, the longitudinal and transverse breaking elongation of each linear meter is not more than 3%, the ultimate peeling force of adhesive and welding points is not less than 100N, and the freezing resistance temperature is 35 ℃ below zero.

7. The splicing construction method for reconstructing old and new roads according to claim 1, wherein the step of performing pavement construction and surface collection on the road on which the geogrid is laid comprises:

spreading cement paste in the construction process at the lap joint of the original pavement lime soil, the original pavement lime aggregate and the original pavement asphalt surface layer with the newly-built cement stabilized base layer; cement paste is poured on the vertical face of the original pavement step, a manual watering can is adopted for the cement paste, and a flat nozzle with the width not less than 5cm is adopted for a nozzle; after the water-stable mixture is spread and initially pressed, cement paste is reinjected to the joint of the new road and the old road; and (5) performing stable rolling and forming by water, before final pressing, re-pouring water slurry to the joint, and finally pressing and compacting the surface by a three-steel-wheel road roller.

Technical Field

The application relates to the technical field of high-speed reconstruction and extension of new and old roads splicing and lapping construction, in particular to a reconstruction and extension new and old road splicing construction method.

Background

At present, with the development of economy, vehicles are increasing, and projects for reconstructing and expanding original narrow and old roads are increasing. The problems of poor water tightness, inconvenient construction, time and labor waste, poor compactness, poor anti-shearing and anti-bending tensile capacities and the like of spliced parts of the new road and the old road are solved well so far, and the problems are mainly shown in that the spliced parts between the new road and the old road are easy to crack longitudinally to cause rainwater infiltration. And further, the spliced road surface is subjected to uneven settlement, water damage, cracking, roadbed sideslip and other diseases, so that the overall engineering quality of the reconstructed and expanded road is seriously affected.

Meanwhile, the disease causes of reconstruction and extension projects are manifold, but poor combination and uneven deformation between new and old roadbeds are the most fundamental reasons and are also main control factors in roadbed widening projects.

Disclosure of Invention

The application provides a new and old way concatenation construction method of rebuilding and expanding, has reduced loaded down with trivial details technology, puts emphasis on the key link, reduces the construction degree of difficulty, has improved new and old way concatenation quality, reduces new and old way concatenation longitudinal crack and goes wrong, realizes high-efficient construction, the stable purpose of quality control, has fine practicality.

The technical scheme adopted by the application for solving the technical problems is as follows:

a splicing construction method for reconstructing and expanding new and old roads comprises the following steps:

processing the widened roadbed base and the original road side slope;

to the widened part subgrade basement and the original road side slope that handle, adopt the mode of the original road pavement of splitlevel excavation, accomplish the step concatenation of widened part subgrade basement and original road, the excavation mode includes: the step milling position is 10cm at the inner side of an original road lane, the step width of an original road asphalt layer milling step is 45cm, the secondary lime aggregate of the original road is milled to form a step with the width of 25cm, the original road lime soil step is reserved firstly, and is removed later and is paved together with newly-built water stably;

hydraulic tamping is adopted for the combination part of the widened roadbed base and the original road;

laying a layer of geogrid on the widened roadbed base and the bottom surfaces of the original road beds on and under the original road splicing position, wherein the geogrid is not spliced within the range of the transverse width of 8m, is fixed by U-shaped nails, 4 geogrids are used for each meter of width, the geogrid with the width of 8m is upwards folded for 25cm along the step, and the folded geogrid is fixed at the step by the U-shaped nails;

and carrying out pavement construction and face collection work on the road on which the geogrid is laid.

Optionally, the processing of the widened roadbed base and the original road slope includes: the method is characterized in that the surface soil of a widened part of the roadbed pavement with the thickness of 30cm is cleaned, the surface soil, vegetation, tree roots and original pavement side ditches on the existing roadbed side slope are cleaned on the premise of keeping the roadbed stable by the original road side slope cleaning method.

Optionally, after the treatment of the widened roadbed base and the original road slope, the method further comprises:

continuously over-digging 30cm of surface soil on the processed widened roadbed base, removing low-lying wet filling road sections which are easy to accumulate water, mixing 3% lime in situ in the rest road sections for backfilling, and replacing and filling gravel or old road masonry broken materials for backfilling the low-lying wet filling road sections which are easy to accumulate water; the original ground is placed in pits, holes and acupuncture points, after sediment is removed, fillers are used for backfill and compaction in a layered mode, after the foundation reaches the heavy compaction degree of 90%, a 25KJ impact road roller is used for rolling for 20 times, roadbed filling is started, the roadbed is compacted in a layered mode, and after the roadbed is finished, the side slope is trimmed.

Optionally, to the widened part subgrade basement and original road slope that handle, adopt the mode of the original road pavement of splitlevel excavation, accomplish the step concatenation of widened part subgrade basement and original road, still include:

the step excavation line is accurately laid out before the step excavation, the vertical direction of the excavated step is required to be vertical downward, and the horizontal direction is provided with an inward inclined 2% cross slope.

Optionally, the step of tamping the joint between the roadbed base of the widened part and the original road by using hydraulic pressure comprises the following steps: the tamping position is in a range of 2m close to the step after every 1m of filling, the tamping times are not less than 3 times, or the tamping settlement difference of two adjacent times is less than 0.5cm, the tamping sequence is that the position far away from the step is a first point, the step is a second point, and the gap between the two points is a third point for construction.

Optionally, the geogrid is a bidirectional steel-plastic composite geogrid with the specification of GSZ80-80, the longitudinal and transverse ultimate tensile strength of each linear meter is 80KN/m, the longitudinal and transverse breaking elongation of each linear meter is not more than 3%, the ultimate peeling force of bonding and welding points is not less than 100N, and the freezing resistance temperature is 35 ℃ below zero.

Optionally, the performing of the road surface construction and the surface folding work on the road on which the geogrid is laid includes:

spreading cement paste in the construction process at the lap joint of the original pavement lime soil, the original pavement lime aggregate and the original pavement asphalt surface layer with the newly-built cement stabilized base layer; cement paste is poured on the vertical face of the original pavement step, a manual watering can is adopted for the cement paste, and a flat nozzle with the width not less than 5cm is adopted for a nozzle; after the water-stable mixture is spread and initially pressed, cement paste is reinjected to the joint of the new road and the old road; and (5) performing stable rolling and forming by water, before final pressing, re-pouring water slurry to the joint, and finally pressing and compacting the surface by a three-steel-wheel road roller.

The technical scheme provided by the application comprises the following beneficial technical effects:

the splicing construction method for reconstructing and expanding new and old roads provided by the technical scheme of the application comprises the following steps: processing the widened roadbed base and the original road side slope; to the widened part subgrade basement and the original road side slope that handle, adopt the mode of the original road pavement of splitlevel excavation, accomplish the step concatenation of widened part subgrade basement and original road, the excavation mode includes: the step is milled and is dug the position and at original road lane inboard 10cm, avoids the wheel track area, and under the vehicle load effect, can effectively reduce vertical crack, original road pitch layer mills and digs step width 45cm, mills and dig two grey aggregate formation of original road and wide 25cm step, reserves original road grey soil step earlier in the earlier stage, and the later stage is clear away, and is steadily spread jointly with newly-built water, can guarantee step integrality and grey soil intensity like this. Hydraulic tamping is adopted for the combination part of the widened roadbed base and the original road; laying a layer of geogrid on the widened roadbed base and the bottom surfaces of the original road beds on and under the original road splicing position, wherein the geogrid is not spliced within the range of 8m in transverse width, is fixed by U-shaped nails, 4 geogrids are used for each meter in width, the geogrid with the width of 8m is upwards folded for 25cm along the step, and the folded geogrid is fixed at the step by the U-shaped nails, so that the slip resistance and the bearing capacity of the spliced wide roadbed can be integrally improved; and carrying out pavement construction and face collection work on the road on which the geogrid is laid. The application provides a new and old road splicing construction method of rebuilding and expanding, has reduced loaded down with trivial details technology, pays attention to the key link, reduces the construction degree of difficulty, has improved new and old road splicing quality, realizes high-efficient construction, the stable purpose of quality control, has fine practicality, has solved among the prior art because the problem of serious influence the whole engineering quality of rebuilding and expanding highway is produced because the road surface after the concatenation that the vertical crack of new and old road splicing appears and leads to is inhomogeneous to subside, water damage, fracture, road bed sideslip and other diseases.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.

FIG. 1 is a flow chart of a splicing construction method for reconstructing a new road and an old road provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a splicing design of a new road and an old road for reconstruction and extension provided in an embodiment of the present application;

fig. 3 is a geogrid laying optimization design diagram provided in an embodiment of the present application;

fig. 4 is a schematic diagram of a hydraulic dynamic compaction provided in an embodiment of the present application.

Detailed Description

In order to make the technical solutions in the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; it is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a splicing construction method for reconstructing and expanding new and old roads, which comprises the following steps as shown in figure 1:

processing the widened roadbed base and the original road side slope, removing the old steel guardrails on two sides of the original road, excavating the soil shoulder, and cleaning the working surface to avoid mixing other impurities during the subsequent process;

the step type splicing of the widened roadbed base and the original road is completed by adopting a mode of excavating the original road pavement in a split-level manner for the processed widened roadbed base and the original road side slope,

the traditional excavation mode is that, the original road lane half width is: 0.75m of curb belt, 3.75m of lane and 3.5m of hard shoulder, wherein the step is excavated at the inner side of the hard shoulder by 25cm, the old road asphalt layer and the original road second gray particle layer are milled, and a 50cm wide step is formed on the original road second gray particle layer. The old road subgrade excavation steps are 100cm in height and 150cm in width and are sequentially excavated downwards to the original ground. The excavation mode given in the embodiment of the application is as follows: the improved widened road lane has the following half width: 0.75m curb area +3.75m lane +3.75m hard road shoulder, the step is milled and is put at original road lane inboard 10cm, can avoid the wheel track area, as shown in figure 2, under the vehicle load effect, can effectively reduce vertical crack, original road pitch layer is milled and is planed the step width 45cm, mill and plane two grey aggregates of original road and form wide 25cm step, earlier remain original road grey soil step, the later stage is clear away, with newly-built water steady spread jointly, can guarantee step integrality and grey soil intensity like this.

The combination part of the widened roadbed base and the original road is tamped by hydraulic pressure, and the combination part of the widened roadbed base and the original road is tamped by a hydraulic pressure dynamic compactor and compacted by impact rolling.

Selecting a strong gear for tamping to be 40KJ, using a hydraulic dynamic compactor at the slope toe of the side slope of the old road bed, using the hydraulic dynamic compactor for vibration hammering within the range of 2m, after the whole working surface is tamped, shoveling the impact-squeezed virtual soil on the surface of the road bed, leveling the soil by a land leveler, and then rolling and leveling the soil by a steel wheel road roller.

In order to reduce the settlement difference between the new roadbed and the old roadbed of the filled roadbed, the soil filling of the combined part is compacted. And (3) performing layered filling and rolling compaction on the newly-built widened roadbed, and under the premise of ensuring the normal compaction degree, rolling the newly-built widened roadbed base and the top surfaces of the upper and lower embankments for 20 times by using a 25KJ impact road roller, and performing impact pressure compensation on the top surface of each step of the filled roadbed.

The geogrid is laid as a crucial ring in splicing construction of new and old roadbed, so that the geogrid can reduce differential settlement of the new and old roadbed and improve the integrity and tensile strength of the roadbed. And if the strength of the old road bed does not meet the standard, a layer of geogrid is paved on the bottom surfaces of the upper road bed and the lower road bed respectively, but for the road section of which the strength of the old road bed meets the design requirement after the road surface is excavated, the original road bed is not excavated, and a layer of geogrid is paved on the top surface of the old road bed. In the embodiment of the application, one layer of geogrid is paved on the widened part of the roadbed base and the bottom surfaces of the original road beds on and under the original road splicing position, as shown in fig. 3, the geogrids are not spliced within the range of 8m in transverse width, are fixed by U-shaped nails, 4 geogrids are used for each meter in width, the geogrids with the width of 8m are upwards folded for 25cm along the steps, and the folded geogrids are fixed at the steps by the U-shaped nails, so that the anti-sliding force and the bearing capacity of the spliced wide roadbed can be integrally improved, the rest parts are flatly paved on the top surfaces of the road beds along the side surfaces and are manually fixed, the connection of the new roadbed and the old roadbed is strengthened in the horizontal direction, and the integral stability of the road surface; when the earthwork lattice shed is laid, the direction with high strength is arranged to be vertical to the axis of the embankment; when the geogrid is laid longitudinally, the geogrid is not laid transversely in a multi-connection mode, the surface of a soil layer for laying the geogrid needs to be flat, hard projections such as broken stones and block stones are strictly forbidden on the surface, folds are not allowed when the geogrid is laid, and manual tensioning is applied. After the earthwork lattice shed is paved, filling materials are filled in time so as to prevent the earthwork lattice shed from being directly exposed to sunlight for too long time.

And carrying out pavement construction and face collection work on the road on which the geogrid is laid.

The splicing construction method for reconstructing the old and new roads provided by the embodiment of the application reduces the tedious process, pays attention to key links, reduces the construction difficulty, improves the splicing quality of the old and new roads, realizes the purposes of high-efficiency construction and stable quality control, has good practicability, and solves the problems that in the prior art, because the defects of uneven settlement of the spliced road surface, water damage, cracking, side slipping of a roadbed and the like caused by the occurrence of longitudinal cracks in splicing of the old and new roads seriously affect the overall engineering quality of the reconstructed road.

Optionally, the processing of the widened roadbed base and the original road slope includes: the method is characterized in that the surface soil of a widened part of the roadbed pavement with the thickness of 30cm is cleaned, the surface soil, vegetation, tree roots and an original pavement side ditch on the existing roadbed side slope are cleaned on the premise of keeping the roadbed stable by the original road side slope cleaning method, and the cleaned surface soil needs to be stacked in a concentrated mode and is used for greening and protection engineering after the construction of main engineering is completed.

Optionally, after the treatment of the widened roadbed base and the original road slope, the method further comprises:

continuously over-digging 30cm of surface soil on the processed widened roadbed base, removing low-lying wet filling road sections which are easy to accumulate water, mixing 3% lime in situ in the rest road sections for backfilling, and replacing and filling gravel or old road masonry broken materials for backfilling the low-lying wet filling road sections which are easy to accumulate water; the original ground is placed in pits, holes and acupuncture points, after sediment is removed, filler is used for backfill and compaction in a layered mode, after the base reaches the heavy compaction degree of 90%, a 25KJ impact road roller is used for rolling for 20 times, and then roadbed filling is started, and the heavy road roller can be used for reinforcing and pressure supplementing due to the fact that the sections are too long and cannot be rolled by impact. In order to ensure the compactness of the roadbed, the ultra-wide 30cm of each of the two sides of the filled roadbed is filled, the roadbed and the filling are required to be constructed synchronously, the roadbed is compacted in a layered mode, and the side slope is trimmed after the roadbed is finished.

Optionally, to the widened part subgrade basement and original road slope that handle, adopt the mode of the original road pavement of splitlevel excavation, accomplish the step concatenation of widened part subgrade basement and original road, still include:

the step excavation line is accurately laid out before the step excavation, the excavation of the step on the upper layer is carried out after the step on the bottom layer is filled, the vertical requirement of the excavation step is vertical downward, the excavation linearity is guaranteed to be straight and smooth, the position is accurate, and the horizontal direction is provided with an inward inclined 2% cross slope.

Optionally, the joint of the widened subgrade base and the original road is tamped by hydraulic pressure, as shown in fig. 2, the tamping position is within 2m of the adjacent step after each 1m of filling, the tamping times are not less than 3 times, or the tamping settlement difference between two adjacent times is less than 0.5cm, the tamping sequence is that the position far away from the step is the 1 st point, the step is the 2 nd point, and the gap between the two points is the 3 rd point, and the tamping principle is shown in fig. 4.

Optionally, the geogrid is a bidirectional steel-plastic composite geogrid with the specification of GSZ80-80, the longitudinal and transverse ultimate tensile strength of each linear meter is 80KN/m, the longitudinal and transverse breaking elongation of each linear meter is not more than 3%, the ultimate peeling force of bonding and welding points is not less than 100N, and the freezing resistance temperature is 35 ℃ below zero so as to meet the construction requirements of severe cold regions.

Optionally, the performing of the road surface construction and the surface folding work on the road on which the geogrid is laid includes:

spreading cement paste in the construction process at the lap joint of the original pavement lime soil, the original pavement lime aggregate and the original pavement asphalt surface layer with the newly-built cement stabilized base layer; the process comprises the following steps: spreading cement slurry → paving → artificially spreading in triangular space → initial pressing → recharging cement slurry in the joint → compacting → recharging cement slurry → final pressing of the roller with three steel wheels. Cement paste is poured on the vertical face of the original pavement step, a manual watering can is adopted for the cement paste, and a flat nozzle with the width not less than 5cm is adopted for a nozzle; after the water-stable mixture is spread and initially pressed, cement paste is reinjected to the joint of the new road and the old road; and (5) performing stable rolling and forming by water, before final pressing, re-pouring water slurry to the joint, and finally pressing and compacting the surface by a three-steel-wheel road roller.

And (4) checking the consistency of the cement paste on site, and judging whether the casting surface has dead corners or not, the uniformity and the casting times meet the requirements or not.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It will be understood that the present application is not limited to what has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.