阅读说明：本技术 一种绿色加筋土挡土墙结构及施工方法 (Green reinforced earth retaining wall structure and construction method ) 是由 赵乾文 程小亮 赵宇 于 2020-05-14 设计创作，主要内容包括：本发明公开了一种绿色加筋土挡土墙结构及施工方法,包括挡墙墙面和挡墙后填土,挡墙后填土布置于挡墙墙面后侧,挡墙后填土的各填土层之间铺设有土工格栅；挡墙墙面是由多层堆叠的植草网眼袋构成。本发明的造价低,适用性强,可营造绿色有生机的挡墙结构,操作简便,适用性强,可减少挡墙墙后土压力,减轻自身重量；整体性好,强度高,刚度大。本发明提供的施工方法操作简便,适用性强。(The invention discloses a green reinforced earth retaining wall structure and a construction method, wherein the green reinforced earth retaining wall structure comprises a retaining wall surface and retaining wall back filling, the retaining wall back filling is arranged at the rear side of the retaining wall surface, and geogrids are laid among all filling layers of the retaining wall back filling; the wall surface of the retaining wall is formed by a plurality of layers of piled grass planting mesh bags. The invention has low cost, strong applicability, simple operation and strong applicability, can build a green organic retaining wall structure, can reduce the soil pressure behind the retaining wall and reduce the self weight; good integrity, high strength and high rigidity. The construction method provided by the invention is simple and convenient to operate and strong in applicability.)

1. A green reinforced earth retaining wall structure is characterized by comprising a retaining wall surface and retaining wall back filling, wherein the retaining wall back filling is arranged on the rear side of the retaining wall surface, and geogrids are laid among all filling layers of the retaining wall back filling; the wall surface of the retaining wall is formed by a plurality of layers of piled grass planting mesh bags.

2. The green reinforced earth retaining wall structure of claim 1, wherein the earth filling behind the retaining wall is a foamed light earth filling.

3. The green reinforced earth retaining wall structure of claim 1, wherein the grass planting mesh bags contain planting soil and grass seeds.

4. The green reinforced retaining wall structure as claimed in claim 1, wherein one end of the geogrid is turned inside around the grass-planting mesh bag of the corresponding layer of the retaining wall surface, and the other end of the geogrid is fixed as an outer free end by a U-shaped nail.

5. The green reinforced earth retaining wall structure according to claim 1, wherein the geogrids are connected by connection rods.

6. A construction method for implementing the green reinforced earth retaining wall structure of claim 1, comprising the steps of:

1) excavating and leveling the ground in the range of the wall bottom according to the design requirement;

2) erecting a temporary formwork according to the inclination angle of the wall surface of the retaining wall;

3) laying a layer of geogrid on the rear side of the temporary mould frame;

4) placing the grass planting mesh bag on the geogrid in a manner of clinging to the temporary template in a transverse stacking manner;

5) filling reinforced soil filler on the geogrid;

6) one end of the geogrid reversely bypasses the paved grass planting mesh bag to serve as a reverse wrapping section, and the geogrid is compacted through reinforced earth fillers;

7) and repeating the steps 3) -6) until the grass planting mesh bags and the geogrids are sequentially stacked and stacked to reach the design height.

7. The construction method according to claim 6, wherein in the step 1), the excavation range exceeds 0.3-0.5 m of the range of the edge of the wall bottom, and after the excavation, the whole area is fully checked, all weak soil needs to be compacted or filled with proper soil materials, and the whole area is fully compacted to the design standard.

8. The construction method according to claim 6, wherein in the step 3), the specific process of laying the geogrid comprises the following steps: the geogrid is horizontally laid and is perpendicular to the wall surface, the tail portion of the geogrid is fixed to the bottom of the wall through U-shaped nails or bamboo nails, and the head portion of the geogrid is used as a reverse wrapping section and is temporarily placed outside the wall surface.

9. The construction method according to claim 6, wherein in the step 4), soil and grass seeds or turf are filled in the grass planting mesh bag, and one end of the grass seeds or turf in the mesh bag faces the outer side of the retaining wall and is stacked.

10. The construction method according to claim 6, wherein in the step 7), between each cycle repetition step, the method further comprises the following steps: and connecting the reverse wrapping sections of the two adjacent layers of geogrids through a connecting rod.

Technical Field

The invention relates to the technical field of building construction, in particular to a green reinforced earth retaining wall structure and a construction method.

Background

Compared with the common gravity type retaining wall, the reinforced earth retaining wall has the characteristics of low manufacturing cost, strong foundation adaptability, good landscape effect and the like, the design of the reinforced earth retaining wall is properly carried out in the visible range of national provinces and the visible range of intercommunicating ramps along the line, the reinforced earth retaining wall is generally arranged on soft rock or soil sections due to strict filling requirements, the gravity type retaining wall is generally adopted on hard rock sections, and when the foundation condition is poor, the scheme of the reinforced earth retaining wall is slightly adopted on local hard rock sections.

Disclosure of Invention

The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides the green reinforced earth retaining wall structure and the construction method thereof, which have the advantages of low manufacturing cost, strong applicability, capability of building a green organic retaining wall structure, simple and convenient operation and strong applicability.

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

a green reinforced earth retaining wall structure comprises a retaining wall surface and retaining wall back filling, wherein the retaining wall back filling is arranged on the rear side of the retaining wall surface, and geogrids are laid among all filling layers of the retaining wall back filling; the wall surface of the retaining wall is formed by a plurality of layers of piled grass planting mesh bags.

According to the technical scheme, the soil filled behind the retaining wall is foam light soil filler.

According to the technical scheme, planting soil and grass seeds are filled in the grass planting mesh bag.

According to the technical scheme, one end of the geogrid bypasses the grass planting mesh bag of the corresponding layer of the wall surface of the retaining wall and is reversely wrapped, and the other end of the geogrid is fixed as an outer free end through the U-shaped nail.

According to the technical scheme, all layers of geogrids are connected through the connecting rods.

A construction method for implementing the green reinforced earth retaining wall structure comprises the following steps:

1) excavating and leveling the ground in the range of the wall bottom according to the design requirement;

2) erecting a temporary formwork according to the inclination angle of the wall surface of the retaining wall;

3) laying a layer of geogrid on the rear side of the temporary mould frame;

4) placing the grass planting mesh bag on the geogrid in a manner of clinging to the temporary template in a transverse stacking manner;

5) filling reinforced soil filler on the geogrid;

6) one end of the geogrid reversely bypasses the paved grass planting mesh bag to serve as a reverse wrapping section, and the geogrid is compacted through reinforced earth fillers;

7) and repeating the steps 3) -6) until the grass planting mesh bags and the geogrids are sequentially stacked and stacked to reach the design height.

According to the technical scheme, in the step 1), the excavation range exceeds 0.3-0.5 m of the range of the edge of the wall bottom, the whole inspection is carried out after excavation, all weak soil needs to be compacted or appropriate soil needs to be filled, and the whole field is comprehensively compacted to the design standard.

According to the technical scheme, in the step 3), the specific process of laying the geogrid comprises the following steps: the geogrid is horizontally laid and is perpendicular to the wall surface, the tail portion of the geogrid is fixed to the bottom of the wall through U-shaped nails or bamboo nails, and the head portion of the geogrid is used as a reverse wrapping section and is temporarily placed outside the wall surface.

According to the technical scheme, in the step 4), soil and grass seeds or turf are filled in the grass planting mesh bag, and one end of the grass seeds or turf in the mesh bag faces the outer side of the retaining wall and is stacked.

According to the technical scheme, in the step 7), the method further comprises the following steps among the repeated steps of each cycle: and connecting the reverse wrapping sections of the two adjacent layers of geogrids through a connecting rod.

The invention has the following beneficial effects:

1. the invention has low cost and strong applicability, the grass planting mesh bag adopted by the structure of the invention is superior to the common retaining wall structure, the green organic retaining wall structure can be built, the operation is simple and convenient, and the applicability is strong.

2. The backfill soil is foam light soil, so that the soil pressure behind the retaining wall can be reduced and the self weight can be reduced compared with the common fill material; the geogrid is laid layer by layer, and the purpose is to strengthen the connection between soil bodies, so that the geogrid is good in integrity, high in strength and high in rigidity. The construction method provided by the invention is simple and convenient to operate and strong in applicability.

Drawings

FIG. 1 is a schematic structural view of a green reinforced retaining wall structure according to an embodiment of the present invention;

FIG. 2 is a schematic view showing a rolling sequence in the construction method according to the embodiment of the present invention;

in the figure, 1-retaining wall surface, 2-grass planting mesh bags, 3-temporary templates, 4-connecting rods, 5-geogrid, 6-foam light soil filler, 7-top layer reverse-wrapping grid and 8-wall bottom foundation.

Detailed Description

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

Referring to fig. 1, the green reinforced earth retaining wall structure according to an embodiment of the present invention includes a retaining wall surface 1 and retaining wall back-fill, the retaining wall back-fill is disposed at the rear side of the retaining wall surface 1, and geogrids 5 are laid between the respective fill layers of the retaining wall back-fill.

Furthermore, the soil filled behind the retaining wall is foam light soil filler 6; to reduce the earth pressure against the wall surface 1 of the retaining wall.

Furthermore, the retaining wall surface 1 is composed of grass planting mesh bags 2, and planting soil and grass seeds are arranged in the grass planting mesh belts; the green landscape effect is good after the building.

Furthermore, one end of the geogrid 5 bypasses the grass planting mesh bag 2 of the corresponding layer of the retaining wall surface 1 and is reversely wrapped inside to form a reversely wrapped section of the geogrid 5, and the other end of the geogrid 5 serving as an outer free end is fixed through a U-shaped nail.

Further, the geogrids 5 are connected through the connecting rods 4.

A construction method for implementing the green reinforced earth retaining wall structure comprises the following steps:

1) excavating and leveling the ground in the range of the wall bottom according to the design requirement;

2) erecting a temporary formwork and pulling wires according to the inclination angle of the retaining wall surface 1;

3) laying a layer of geogrid 5 on the rear side of the temporary mould frame;

4) the grass planting mesh bags 2 are tightly attached to the temporary template 3 and are transversely and orderly stacked on the geogrid 5;

5) filling reinforced soil filler on the geogrid 5;

6) one end of the geogrid 5 reversely bypasses the paved grass planting mesh bag 2 to serve as a reverse wrapping section, and the geogrid 5 is compacted through reinforced earth fillers;

7) and repeating the steps 3) to 6) until the grass planting mesh bags 2 and the geogrids 5 are sequentially stacked and piled up to reach the design height.

Further, in the step 1), the excavation range exceeds 0.3-0.5 m of the wall bottom edge range, the comprehensive inspection is carried out after excavation, all weak soil needs to be compacted or appropriate soil materials need to be filled, and the whole field is comprehensively compacted to the design standard.

Further, in step 3), the specific process of laying the geogrid 5 includes: horizontally laying the geogrid 5, enabling the geogrid 5 to be vertical to the wall surface, fixing the tail of the geogrid 5 on the bottom of the wall by using U-shaped nails or bamboo nails, and temporarily placing the head of the geogrid 5 outside the wall surface as a reverse wrapping section; the adjacent grids do not overlap and butt.

Further, in the step 4), soil and grass seeds or turf are filled in the grass planting mesh bag 2, and one end of the grass seeds or turf in the mesh bag faces the outer side of the retaining wall and is stacked.

Further, in the step 7), the method further includes the following steps between each cycle of repeating the steps: the reverse wrapping sections of two adjacent layers of geogrids 5 are connected through a connecting rod 4.

In the first embodiment provided by the present invention: the reinforced retaining wall structure mainly comprises a retaining wall surface 1, soil filled behind the retaining wall, and geogrids 5 laid between soil layers. The retaining wall surface 1 is composed of grass planting mesh bags 2, planting soil and grass seeds are arranged in the grass planting mesh bags, and the green landscape effect is good after the retaining wall is built. The filling behind the retaining wall is made of foam light soil to reduce soil pressure on the wall surface 1 of the retaining wall, geogrids 5 are laid among the foam light soil, and the distance between the geogrids 5 is determined according to rolling machinery and field tests. The geogrids 5 are connected through the connecting rods 4, and the free ends of the geogrids 5 are fixed through U-shaped nails.

The invention discloses a retaining wall construction method which mainly comprises the following steps:

the first step is as follows: and (5) leveling the wall bottom. The ground within the range of the wall bottom is dug to be smooth according to the design requirement. The excavation range is preferably 0.3-0.5 m beyond the wall bottom range. And after excavation, comprehensively inspecting, wherein all weak soil needs to be compacted or filled with proper soil materials, and the whole field is comprehensively compacted to the design standard, wherein the compaction standard is that the compaction degree reaches 90%.

The second step is that: and erecting a temporary formwork and drawing a line according to the wall surface inclination angle of the retaining wall according to the slope rate of the designed slope of 1: 0.5.

The third step: and (5) blanking the geogrid 5. The grid is cut according to the design length of the first layer (namely, close to the bottom layer of the wall), the length of the wall surface part and the length of the horizontal section for connecting the upper layer.

The fourth step: a first layer of grid is laid. Laying a first layer of geogrid 5 close to the bottom layer of the wall, wherein the length of the geogrid 5 is equal to the length of a part of the wall surface and the length of a horizontal section for connecting the geogrid with an upper layer; the geogrid 5 must be laid horizontally and perpendicular to the wall surface, the tail portion of the geogrid is fixed to the bottom of the wall through U-shaped nails or bamboo nails, and the reverse wrapping section is temporarily placed outside the wall surface. The adjacent grids do not overlap and butt.

The fifth step: the mesh bag filled with loam and grass seeds (or turf) is sealed by a baling machine. The positions of the mesh bags are controlled according to the die carrier and the pull wires, the mesh bags are stacked orderly, and one end of the mesh bags filled with grass seeds (or turf) faces the outer side of the retaining wall.

And a sixth step: and filling reinforced earth materials. After the grass planting mesh bags 2 are stacked, reinforced earth materials-foam light soil are backfilled, and the soil materials are discharged onto the grating in a waterfall manner from the tail end of the grating by using mechanical equipment such as an excavator. When unloading, the mechanical equipment should stop moving, and the soil can be slowly moved to unload the soil after the soil to be unloaded is pressed on the grating. The spreading can be carried out manually or mechanically. And determining the paving thickness through a field test, and layering and compacting to the top surface elevation of the first layer. In any case, the wheels or tracks of construction equipment such as roller compaction should be separated from the grating by at least 150mm of earth material to prevent mechanical damage to the grating. The vibration rolling compaction is adopted, and light equipment (such as a flat plate compactor) is adopted to roll the mesh bags and the positions close to the wall surface by about 1 m. The sheep foot should not be ground at any position.

The seventh step: the sequence of rolling is shown in figure 2. The running direction of the roller is parallel to the horizontal direction of the retaining wall. The number of passes should be determined experimentally in conjunction with the specific rolling machinery and filler properties. The footprint of the next pass should overlap 1/3 the footprint width of the previous pass. The first light press did not shake. The rolling is performed gradually from the middle of the grid to the tail (free end) and then gradually turns to the wall surface 1.

Eighth step: and constructing the backfill according to the optimal water content. The compactness reaches 95%, and the number of the compactness detection points is determined according to the check and acceptance standard.

The ninth step: and reversely wrapping the reverse-wrapping section of the grating which is arranged outside the wall surface on the paved mesh bag and the compacted first layer of filling material.

And performing grid blanking and laying work of a second layer according to the third step and the fourth step of the program.

The tenth step: the second layer of grid is connected with the reverse-wrapped section of the first layer of grid by a connecting rod 4.

The eleventh step: and applying tension to the free end of the upper layer of the grating by using the tensioning hook to enable the connecting rod 4 to be tensioned and stressed until the reverse-wrapping section grating of the wall surface is also tensioned and stressed. For opening and pulling hooksThe length of the steel bar is about 1 m. And (3) stretching the grating at least 2 people at the same time, and pulling a stretching hook by the left hand and the right hand of each person.

The twelfth step: the free end of the upper layer of the grating is fixed by a U-shaped nail, and then the stretching draw hook is released.

The above procedure is repeated until the design height of the structure.

The reverse-wrapping section of the top grid layer is fixed by adopting a measure of burying the reverse-wrapping section in the top layer filler, and the length of the reverse-wrapping section is longer than that of the reverse-wrapping section of each layer below the reverse-wrapping section. And compacting the uppermost layer of filling soil as required.

The above is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereby, and therefore, the present invention is not limited by the scope of the claims.