阅读说明：本技术 一种设置拉伸缓冲层处理旧有挡土墙的施工方法 (Construction method for processing old retaining wall by arranging tensile buffer layer ) 是由 刘存文 王俊 胡文涛 吴孝彬 吴都 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种设置拉伸缓冲层处理旧有挡土墙的施工方法,涉及土木工程技术领域；为了解决施工周期加长,增加作业点安全防护风险问题；具体包括如下步骤：施工准备：熟悉现场情况、丈量并确认旧有挡土墙的位置、几何尺寸、拟新破除面、标高,测量定位得出新建道路路基位置、标高,并在现场,作出明显的标识,还包括编制专项施工方案,明确具体施工方法与措施、交通分流与防护措施,对作业人员、管理人员详细的技术交底与安全交底；加宽路段预回填：划定加宽路段施工区,按设计图纸要求以及施工规范的相关规定进行预先回填。本发明大幅度的减少不必要的工作内容,通过减少工作量的方法提高生产效能、减少施工周期。(The invention discloses a construction method for processing an old retaining wall by arranging a tensile buffer layer, relating to the technical field of civil engineering; the construction method aims to solve the problems that the construction period is prolonged and the safety protection risk of an operation point is increased; the method specifically comprises the following steps: construction preparation: familiarizing the field situation, measuring and confirming the position, the geometric dimension, the planned new broken surface and the elevation of the old retaining wall, measuring and positioning to obtain the position and the elevation of the newly-built road bed, and making an obvious mark on the field; pre-backfilling of the widened road section: and (4) defining a construction area of the widened road section, and pre-backfilling according to the requirements of design drawings and related regulations of construction specifications. The invention greatly reduces unnecessary work content, improves production efficiency and reduces construction period by reducing workload.)

1. A construction method for processing an old retaining wall by arranging a tensile buffer layer is characterized by comprising the following steps:

s1: construction preparation: familiarizing the site situation, measuring and confirming the position and the geometric dimension of the old retaining wall (1), the planned new broken surface (1-1) and the elevation, measuring and positioning to obtain the position and the elevation of the newly-built road subgrade (5), making an obvious mark on the site, and compiling a special construction scheme to define specific construction methods and measures, traffic diversion and protection measures, and performing detailed technical bottoming and safety bottoming for operators and managers;

s2: pre-backfilling of the widened road section: a construction area (3) of the widened road section is defined, and pre-backfilling is carried out according to the requirements of design drawings and related regulations of construction specifications;

s3: breaking the top wall body: utilizing mechanical equipment to break the wall body of the old retaining wall (1) from top to bottom and dig out earthwork to a set elevation to form a new broken surface (1-1);

s4: construction tensile buffer layer (4): adopting rolling and backfilling, filling media and newly building a pre-backfilling area (3) of the widened road section;

s5: paving a newly-built road subgrade (5): and (4) checking and accepting the tensile buffer layer (4), and paving a new road subgrade (5) structure layer according to the requirements of the original design drawing after the tensile buffer layer is qualified.

2. The construction method for processing the old retaining wall by arranging the tensile buffer layer according to claim 1, wherein the widened section pre-backfilling area (3) is arranged at the outer side of the old retaining wall (1), the elevation of the widened section pre-backfilling area (3) is equal to the horizontal position of a new demolition surface (1-1) of the old retaining wall (1), and the filling density of the backfill soil at the junction of the widened section pre-backfilling area (3) and the old retaining wall (1) needs to meet the design requirement.

3. The construction method for processing old retaining wall with tensile buffering layer according to claim 2, characterized in that the clearance between the top surface of the new demolition surface (1-1) and the bottom surface of the newly built road bed (5) is greater than or equal to 800 mm.

4. The construction method for processing the old retaining wall by arranging the tensile buffer layer according to claim 3, wherein the step of excavating the original roadbed (2) on the earth-facing surface to form the anchoring area (4-3) of the tensile buffer layer is arranged at the same time of excavating the wall body of the old retaining wall (1) in the top wall body, the original roadbed (2) is arranged at the outer side of the old retaining wall (1), and the step-shaped interface (2-1) is arranged at the interface of the original roadbed (2) and the anchoring area (4-3) of the tensile buffer layer.

5. A construction method for processing a old retaining wall by arranging a tensile buffering layer according to claim 1, wherein the tensile buffering layer (4) is arranged at the other side of the old retaining wall (1), the other side of the tensile buffering layer (4) is provided with a tensile buffering layer tensile zone (4-4), and the tensile buffering layer anchoring zone (4-3) is arranged inside the tensile buffering layer (4).

6. The construction method for processing the old retaining wall by arranging the tensile buffer layer according to claim 5, wherein the thickness of the tensile buffer layer (4) is more than or equal to 800mm, the inner part of the tensile buffer layer (4) is provided with a double-layer bidirectional anti-tensile geogrid reinforcing band (4-2) along the whole length of the old retaining wall (1), the double-layer bidirectional anti-tensile geogrid reinforcing band (4-2) comprises a lower-layer bidirectional anti-tensile geogrid (4-2-1) and an upper-layer bidirectional anti-tensile geogrid (4-2-2), and the lower-layer bidirectional anti-tensile geogrid (4-2-1) is arranged on the top surface of the new breaking surface (1-1).

7. The construction method for processing the old retaining wall by arranging the tensile buffer layer according to claim 6, wherein the double-layer bidirectional tensile geogrid reinforcing band (4-2) is fixed by a U-shaped iron piece, the length of the double-layer bidirectional tensile geogrid reinforcing band (4-2) in an anchoring area is more than or equal to 2000mm, and the length of the tensile side is more than or equal to 1700 mm.

8. The construction method for processing the old retaining wall by arranging the tensile buffering layer according to claim 7, characterized in that the construction of the tensile buffering layer (4) comprises the steps of arranging layered rolling backfill (4-1-1) above the lower bidirectional tensile geogrid (4-2-1), then backfilling earth and leveling to form the rolling backfill (4-1).

9. The construction method for processing an old retaining wall by arranging a tensile buffer layer according to claim 4, wherein the newly-built road bed (5) is arranged on the top surfaces of the tensile buffer layer (4) and the original road bed (2).

Technical Field

The invention relates to the technical field of civil engineering, in particular to a construction method for processing an old retaining wall by arranging a tensile buffer layer.

Background

The existing retaining wall matched with the original road is often encountered in the construction of road extension and widening engineering design. The original retaining wall plays a role in supporting an original road structure system and maintaining the stability of the original road and the side slopes at the high-low staggered platform of the surrounding natural ground. The existing construction technology for processing the old retaining wall is to completely dig out and break all the retaining walls and backfill earthwork at the original site to construct a newly-built roadbed, and in the processing process of the old retaining wall, a slope rate method is adopted to put a slope and dig the peripheral earthwork according to the peripheral soil quality condition so as to maintain the stability of the earthwork side slope during the processing period of the old retaining wall. However, the construction technology has the disadvantages of more work content, more workload, excessive construction time consumption and overlong construction period caused by the influence before and after each process.

Through retrieval, the patent with Chinese patent application number CN201910344215.8 discloses a construction method of an ecological demolition structure of a retaining wall, which comprises the following steps: 1) investigating the disease state of the retaining wall; 2) laying a construction operation platform; 3) laying a pipeline isolation protection system; 4) laying a retaining wall dismantling and transferring system; 5) demolishing the retaining wall to be demolished; 6) laying a temporary supporting system; 7) and (5) demolishing and constructing other sections of the retaining wall to be demolished. The invention has the beneficial effects that: the construction operation platform is convenient to lay on site and good in integrity, and the top surface elevation of the platform cover plate can be dynamically adjusted; meanwhile, the lifting shifting body can realize the quick lifting and shifting of the construction operation platform as required, and the shifting difficulty of the construction operation platform is reduced. The construction method of the ecological demolition structure of the retaining wall in the patent has the following defects: demolish old retaining wall in-process, destroyed the stability of original road side for construction period extension has increased the operating point safety protection risk.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a construction method for processing an old retaining wall by arranging a tensile buffer layer.

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

a construction method for processing an old retaining wall by arranging a tensile buffer layer comprises the following steps:

s1: construction preparation: familiarizing the field situation, measuring and confirming the position, the geometric dimension, the planned new broken surface and the elevation of the old retaining wall, measuring and positioning to obtain the position and the elevation of the newly-built road bed, and making an obvious mark on the field;

s2: pre-backfilling of the widened road section: defining a construction area of a widened road section, and pre-backfilling according to design drawing requirements and relevant regulations of construction specifications;

s3: breaking the top wall body: utilizing mechanical equipment to break the wall body of the old retaining wall from top to bottom and dig out earthwork to a set elevation to form a new broken surface;

s4: constructing a tensile buffer layer: adopting rolling and backfilling, and filling media in a pre-backfilling area of a newly-built widened road section;

s5: paving a newly-built road subgrade: and (4) checking and accepting the tensile buffer layer, and paving the newly-built road subgrade structure layer according to the requirements of the original design drawing after the tensile buffer layer is qualified.

Preferably: widen highway section backfill district and set up in the outside of old retaining wall, widen highway section backfill district elevation and the horizontal position of the new face of demolishing of old retaining wall and equal, widen the dense degree of backfill of highway section backfill district and old retaining wall juncture and fill and need satisfy the design requirement.

Preferably: the clearance between the top surface of the newly broken surface and the base surface of the newly-built road is more than or equal to 800 mm.

Preferably: when breaking out old retaining wall in the top wall, still include to dig out the original road bed part of face to earth, be formed with tensile buffer layer anchor area, original road bed sets up in the outside of old retaining wall, and original road bed is provided with the step interface with tensile buffer layer anchor area juncture.

Preferably: tensile buffer layer sets up in the opposite side of old retaining wall, and the opposite side of tensile buffer layer is provided with tensile buffer layer stretching zone, and tensile buffer layer anchor district sets up in the inside of tensile buffer layer.

Preferably: the thickness of the tensile buffer layer is larger than or equal to 800mm, a double-layer bidirectional anti-stretching geogrid reinforcing band is arranged inside the tensile buffer layer along the through length of the existing retaining wall, the double-layer bidirectional anti-stretching geogrid reinforcing band comprises a lower-layer bidirectional anti-stretching geogrid and an upper-layer bidirectional anti-stretching geogrid, and the lower-layer bidirectional anti-stretching geogrid is arranged on the top surface of the newly broken surface.

Preferably: the double-layer bidirectional stretch-proofing geogrid reinforcing belt is fixed through a U-shaped iron piece, the length of the double-layer bidirectional stretch-proofing geogrid reinforcing belt in an anchoring area is larger than or equal to 2000mm, and the length of a stretched side is larger than or equal to 1700 mm.

Preferably: the construction tensile buffer layer specifically comprises a lower layer of bidirectional stretch-proofing geogrid, layered rolling backfill is arranged above the lower layer of bidirectional stretch-proofing geogrid, then earth is backfilled, and the earth is leveled to form rolling backfill soil.

Preferably: the newly-built road bed sets up in the top face of tensile buffer layer and original road bed.

The invention has the beneficial effects that:

1. the invention arranges a tensile buffer layer between a newly broken surface and a newly built road subgrade, arranges a double-layer bidirectional tensile geogrid reinforcing band inside the tensile buffer layer, arranges the tensile buffer layer, utilizes the elasticity and the bearing capacity of soil to release road surface load, avoids the counterforce of the old retaining wall at the lower layer from damaging the newly built road subgrade, arranges the double-layer bidirectional tensile geogrid reinforcing band to improve the integrity and the adaptability of the tensile buffer layer, avoids the generation of stress and uneven settlement caused by the uneven soil quality and the buried stones below, greatly reduces unnecessary work content, improves the production efficiency and reduces the construction period by a method of reducing the work load.

2. According to the invention, part of the wall body of the retaining wall is broken from top to bottom by the wall top of the old retaining wall, the peripheral overexcavation earthwork is trimmed into a corresponding step state, the original road bed is damaged as little as possible, the construction land is saved as much as possible, the construction space is saved, the large excavation operation is avoided, the slope stability of the original road is protected, and the safety risk is reduced.

3. The construction operation of expanding and widening the road section can be carried out in advance, the operation is not carried out according to the process sequence of the prior construction technology, the processes of firstly removing the old retaining wall and then constructing and expanding the widened road section are not needed, and the construction progress is accelerated through the expansion and conversion of the operation space.

4. The invention keeps most of the old retaining wall and buries the retaining wall in the backfill area, so that the old retaining wall plays a protective role during construction.

5. The invention adopts the technology of partially breaking the wall top and reserving the wall body, reduces the workload of dismantling the old retaining wall, reduces the workload of excavating the earthwork slope due to the total breaking of the old retaining wall, and reduces the workload of backfilling the widened road section, thereby greatly reducing the engineering investment and the engineering cost.

Drawings

FIG. 1 is a schematic flow chart of a construction method for processing an old retaining wall by arranging a tensile buffering layer according to the present invention;

FIG. 2 is a schematic diagram of a construction method for processing a conventional retaining wall by arranging a tensile buffering layer according to the present invention before construction of the conventional retaining wall;

FIG. 3 is a schematic diagram of a section where a backfill region of a widened section is constructed to a predetermined elevation according to the construction method for processing an old retaining wall by arranging a tensile buffer layer;

FIG. 4 is a schematic view of the construction of the method for processing the old retaining wall by arranging the tensile buffer layer to remove the wall top of the old retaining wall and part of the original road bed;

FIG. 5 is a schematic view of the construction of a tensile buffering layer according to the construction method of the present invention for processing a conventional retaining wall by providing a tensile buffering layer;

FIG. 6 is a schematic diagram of the construction of a newly-built road bed according to the construction method of the invention for disposing an old retaining wall by arranging a tensile buffer layer;

FIG. 7 is a schematic cross-sectional view of a tensile buffering layer of a construction method for processing a conventional retaining wall by arranging the tensile buffering layer according to the present invention;

FIG. 8 is a schematic plan view of a tensile breaker layer according to the construction method for processing a conventional retaining wall by installing the tensile breaker layer according to the present invention.

In the figure: 1 old retaining wall, 1-1 new demolition surface, 2 original road subgrade, 2-1 step forming interface, 3 widened road section pre-backfilling area, 4 stretching buffer layer, 4-1 rolling backfill, 4-1-1 layering rolling backfill, 4-2 double-layer two-way stretch-proofing geogrid reinforcing belt, 4-2-1 lower layer two-way stretch-proofing geogrid, 4-2-2 upper layer two-way stretch-proofing geogrid, 4-3 stretching buffer layer anchoring area, 4-4 stretching buffer layer stretching area and 5 newly-built road subgrade.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.

In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.

Example 1:

a construction method for processing a conventional retaining wall by arranging a tensile buffering layer, as shown in fig. 1 to 8, comprising the steps of:

s1: construction preparation: familiarizing the field situation, measuring and confirming the position and the geometric dimension of the old retaining wall 1, the planned new broken surface 1-1 and the elevation, measuring and positioning to obtain the position and the elevation of the newly-built road bed 5, and making an obvious mark on the field;

s2: pre-backfilling of the widened road section: a construction area 3 of the widened road section is defined, and pre-backfilling is carried out according to the requirements of design drawings and related regulations of construction specifications;

s3: breaking the top wall body: utilizing mechanical equipment to break the wall body of the old retaining wall 1 from top to bottom and dig out earthwork to a set elevation to form a new broken surface 1-1;

s4: constructing a tensile buffer layer 4: adopting rolling and backfilling, and filling media in a pre-backfilling area 3 of the newly built widened road section;

s5: paving a newly-built road bed 5: and (4) checking and accepting the tensile buffer layer 4, and paving a new road subgrade 5 structural layer according to the requirements of the original design drawing after the tensile buffer layer is qualified.

The widened road section pre-backfilling area 3 is arranged on the outer side of the old retaining wall 1.

The clearance between the top surface of the newly broken surface 1-1 and the bottom surface of the newly built road roadbed 5 is more than or equal to 800mm, and the loosened and cracked stones and residues on the newly broken surface 1-1 need to be cleaned.

The method is characterized in that when the wall body of the old retaining wall 1 is broken in the wall body at the top part, the original road bed 2 on the soil facing surface is partially excavated to form a tensile buffer layer anchoring area 4-3.

The original road subgrade 2 is arranged on the outer side of the original retaining wall 1, and a step-shaped interface 2-1 is arranged at the junction of the original road subgrade 2 and the anchoring area 4-3 of the tensile buffer layer.

The tensile buffer layer 4 is arranged on the other side of the old retaining wall 1, a tensile buffer layer stretching area 4-4 is arranged on the other side of the tensile buffer layer 4, and a tensile buffer layer anchoring area 4-3 is arranged inside the tensile buffer layer 4.

Further, the thickness of the tensile buffer layer 4 is larger than or equal to 800mm, a double-layer bidirectional anti-stretching geogrid reinforcing band 4-2 is arranged inside the tensile buffer layer 4 along the through length of the old retaining wall 1, the double-layer bidirectional anti-stretching geogrid reinforcing band 4-2 comprises a lower-layer bidirectional anti-stretching geogrid 4-2-1 and an upper-layer bidirectional anti-stretching geogrid 4-2-2, and the lower-layer bidirectional anti-stretching geogrid 4-2-1 is arranged on the top face of the new broken surface 1-1.

The length of the double-layer bidirectional stretch-proofing geogrid reinforcing belt 4-2 in the anchoring area is larger than or equal to 2000mm, and the length of the stretching side is larger than or equal to 1700 mm.

The construction tensile buffer layer 4 specifically comprises a lower layer of bidirectional stretch-resistant geogrid 4-2-1, layered rolling backfill 4-1-1 is arranged above the lower layer of bidirectional stretch-resistant geogrid 4-2-1, then earth is backfilled, and the earth is leveled to form rolling backfill 4-1.

Newly-built road bed 5 sets up in tensile buffer layer 4 and original road bed 2's top face.

When the retaining wall is used, part of the retaining wall body of the old retaining wall 1 is broken from top to bottom from the wall top, and peripheral super-cut earthwork is trimmed into a corresponding step state; the method is characterized in that a tensile buffer layer 4 is arranged between a newly-broken surface and a newly-built road subgrade, and a double-layer bidirectional anti-tensile geogrid reinforcing belt 4-2 is arranged in the tensile buffer layer 4, so that the problem of uneven soil quality of buried stones in a roadbed base layer is effectively solved, specifically, the load transmitted by the roadbed and the subgrade is dispersed and eliminated through the tensile buffer layer 4, the double-layer bidirectional anti-tensile geogrid reinforcing belt 4-2 is added, the stress and uneven settlement generated by uneven soil quality and buried stones below are avoided, unnecessary work content is greatly reduced, the production efficiency is improved through a method of reducing the workload, the construction period is shortened, a side slope supporting system of an original road is damaged as little as possible, the original road subgrade is damaged as little as possible, construction land is saved as much as possible, construction space is saved, large excavation operation is avoided, and the side slope, the construction operation of expanding and widening the road section can be carried out in advance, the operation is not carried out according to the process sequence of the prior construction technology, the processes of firstly removing the old retaining wall and then expanding and widening the road section in the construction are not needed, and the construction progress is accelerated through the expansion and conversion of the operation space.

Example 2:

a construction method for processing a conventional retaining wall by arranging a tensile buffering layer, as shown in fig. 1 to 8, comprising the steps of:

s1: construction preparation: familiarizing the field situation, measuring and confirming the position and the geometric dimension of the old retaining wall 1, the planned new broken surface 1-1 and the elevation, measuring and positioning to obtain the position and the elevation of the newly-built road bed 5, and making an obvious mark on the field;

s2: pre-backfilling of the widened road section: a construction area 3 of the widened road section is defined, and pre-backfilling is carried out according to the requirements of design drawings and related regulations of construction specifications;

s3: breaking the top wall body: utilizing mechanical equipment to break the wall body of the old retaining wall 1 from top to bottom and dig out earthwork to a set elevation to form a new broken surface 1-1;

s4: constructing a tensile buffer layer 4: adopting rolling and backfilling, and filling media in a pre-backfilling area 3 of the newly built widened road section;

s5: paving a newly-built road bed 5: and (4) checking and accepting the tensile buffer layer 4, and paving a new road subgrade 5 structural layer according to the requirements of the original design drawing after the tensile buffer layer is qualified.

The construction preparation also comprises compiling a special construction scheme, defining specific construction methods and measures, traffic diversion and protection measures, carrying out detailed technical and safety intersection on operating personnel and management personnel, and carrying out matched safety protection facilities to enter corresponding machines and personnel.

The widened road section pre-backfilling area 3 is arranged on the outer side of the old retaining wall 1.

Furthermore, the elevation of the widened road section pre-filling area 3 is equal to the horizontal position of a new broken surface 1-1 of the old retaining wall 1, the filling density of the backfill soil at the junction of the widened road section pre-filling area 3 and the old retaining wall 1 needs to meet the design requirement, and the compaction degree is reinforced by rolling with a small vibration compactor.

The clearance between the top surface of the newly broken surface 1-1 and the bottom surface of the newly built road roadbed 5 is more than or equal to 800mm, and the loosened and cracked stones and residues on the newly broken surface 1-1 need to be cleaned.

The method is characterized in that when the wall body of the old retaining wall 1 is broken in the wall body at the top part, the original road bed 2 on the soil facing surface is partially excavated to form a tensile buffer layer anchoring area 4-3.

The original road subgrade 2 is arranged on the outer side of the original retaining wall 1, and a step-shaped interface 2-1 is arranged at the junction of the original road subgrade 2 and the anchoring area 4-3 of the tensile buffer layer.

The tensile buffer layer 4 is arranged on the other side of the old retaining wall 1, a tensile buffer layer stretching area 4-4 is arranged on the other side of the tensile buffer layer 4, and a tensile buffer layer anchoring area 4-3 is arranged inside the tensile buffer layer 4.

Further, the thickness of the tensile buffer layer 4 is larger than or equal to 800mm, a double-layer bidirectional anti-stretching geogrid reinforcing band 4-2 is arranged inside the tensile buffer layer 4 along the through length of the old retaining wall 1, the double-layer bidirectional anti-stretching geogrid reinforcing band 4-2 comprises a lower-layer bidirectional anti-stretching geogrid 4-2-1 and an upper-layer bidirectional anti-stretching geogrid 4-2-2, and the lower-layer bidirectional anti-stretching geogrid 4-2-1 is arranged on the top face of the new broken surface 1-1.

And further, the double-layer bidirectional stretch-proofing geogrid reinforcing belt 4-2 is fixed through a U-shaped iron piece, the laying distance needs to be qualified, hidden acceptance check needs to be carried out before earthwork covering, and leveling is carried out according to the standard requirement.

The length of the double-layer bidirectional stretch-proofing geogrid reinforcing belt 4-2 in the anchoring area is larger than or equal to 2000mm, and the length of the stretching side is larger than or equal to 1700 mm.

The construction tensile buffer layer 4 specifically comprises a lower layer of bidirectional stretch-resistant geogrid 4-2-1, layered rolling backfill 4-1-1 is arranged above the lower layer of bidirectional stretch-resistant geogrid 4-2-1, then earth is backfilled, and the earth is leveled to form rolling backfill 4-1.

Newly-built road bed 5 sets up in tensile buffer layer 4 and original road bed 2's top face.

When the retaining wall is used, part of the retaining wall body of the old retaining wall 1 is broken from top to bottom from the wall top, and peripheral super-cut earthwork is trimmed into a corresponding step state; the method is characterized in that a tensile buffer layer 4 is arranged between a newly-broken surface and a newly-built road subgrade, and a double-layer bidirectional anti-tensile geogrid reinforcing belt 4-2 is arranged in the tensile buffer layer 4, so that the problem of uneven soil quality of buried stones in a roadbed base layer is effectively solved, specifically, the load transmitted by the roadbed and the subgrade is dispersed and eliminated through the tensile buffer layer 4, the double-layer bidirectional anti-tensile geogrid reinforcing belt 4-2 is added, the stress and uneven settlement generated by uneven soil quality and buried stones below are avoided, unnecessary work content is greatly reduced, the production efficiency is improved through a method of reducing the workload, the construction period is shortened, a side slope supporting system of an original road is damaged as little as possible, the original road subgrade is damaged as little as possible, construction land is saved as much as possible, construction space is saved, large excavation operation is avoided, and the side slope, the construction operation of expanding and widening the road section can be carried out in advance, the operation is not carried out according to the process sequence of the prior construction technology, the processes of firstly removing the old retaining wall and then expanding and widening the road section in the construction are not needed, and the construction progress is accelerated through the expansion and conversion of the operation space.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.