阅读说明：本技术 一种采用菱形土工格栅的施工方法 (Construction method adopting rhombic geogrid ) 是由 陈珍珍 肖维 杨建冲 冯国耀 廖光磊 张涛 刘玉强 李鑫 彭上志 董庆德 于 2020-06-24 设计创作，主要内容包括：本发明提供一种采用菱形土工格栅的施工方法,属于路基填筑技术领域。本施工方法包括对路基的基层回填、压实平整,铺设菱形土工格栅,远离搭接部的一侧使用塑钢带、管片和U型钉固定,搭接部处使用塑钢带、管片和U型钉固定,固定后使用填料摊铺、压实。本方法采用塑钢带交织穿过菱形土工格栅的格子,使用U型钉锚固方式,可有效加大菱形土工格栅搭接处的抗拉强度和稳定性,菱形土工格栅平整度、菱形土工格栅的拉伸过量、卷边均得到了有效控制,降低了后期返工处理的风险,大大提高了路基填筑施工质量。(The invention provides a construction method adopting a rhombic geogrid, and belongs to the technical field of roadbed filling. The construction method comprises the steps of backfilling a base layer of the roadbed, compacting and leveling, laying the rhombic geogrid, fixing one side, far away from the overlapping part, of the roadbed by using a plastic steel belt, a duct piece and a U-shaped nail, fixing the overlapping part by using the plastic steel belt, the duct piece and the U-shaped nail, and paving and compacting by using a filler after fixing. According to the method, the plastic steel belts are interwoven to penetrate through the lattices of the rhombic geogrid, and a U-shaped nail anchoring mode is adopted, so that the tensile strength and the stability of the lapping part of the rhombic geogrid can be effectively improved, the flatness of the rhombic geogrid, excessive stretching and curling of the rhombic geogrid are effectively controlled, the risk of post-reworking treatment is reduced, and the roadbed filling construction quality is greatly improved.)

1. A construction method adopting a rhombic geogrid is characterized by comprising the following steps:

A. firstly, backfilling a base layer of the roadbed by sand gravel, and compacting and leveling the backfilled base layer;

B. laying rhombic geogrids, and overlapping the two rhombic geogrids to form an overlapping part (1);

C. one side of the rhombic geogrid, which is far away from the lap joint part (1), is interwoven through lattices of the rhombic geogrid by using a plastic steel belt (2), then the plastic steel belt (2) is compressed by a plurality of pipe pieces (3), and the pipe pieces (3) are fixed on a base layer by using U-shaped nails (4);

D. two plastic steel strips (2) are respectively interwoven to penetrate through lattices of two layers of rhombic geogrids at the lap joint part (1), then the plastic steel strips (2) are compressed by a plurality of pipe pieces (3), and the pipe pieces (3) are fixed on a base layer by U-shaped nails (4);

E. and after the rhombic geogrid is fixed, spreading the geogrid from two sides to the middle of the rhombic geogrid by using fillers, and compacting the geogrid.

2. The construction method using the rhombic geogrid as claimed in claim 1, further comprising the following steps of:

F. and D, removing the U-shaped nails (4), the pipe pieces (3) and the plastic steel strips (2) at one end of the rhombic geogrid, which is far away from the lap joint part (1), turning over one end of the rhombic geogrid, which is far away from the lap joint part (1), laying another rhombic geogrid, and repeating the steps B-E to realize laying construction of the other rhombic geogrid.

3. The construction method using the rhombic geogrid as claimed in claim 1, wherein in the step C, after the rhombic geogrid is fixed at the side away from the lapping part (1), 1.5-2.0m wide filler is backfilled and compacted.

4. The construction method using the rhombic geogrid as claimed in claim 1, wherein in the step C, the distance between the plastic steel strip (2) and one end of the rhombic geogrid, which is far away from the overlapping part (1), is more than 30cm, the plastic steel strip (2) is interwoven through the lattices of the rhombic geogrid every 30 +/-5 cm at intervals, and the distance between two adjacent segments (3) is 1.8-2.0 m.

5. A construction method using a rhombic geogrid as claimed in claim 1, wherein in the step D, the width of the overlapping part (1) is more than 30cm, the plastic steel strips (2) are interwoven through the lattices of the rhombic geogrid every 30 ± 5cm at intervals, and the distance between two adjacent segments (3) is 1.8-2.0 m.

6. A construction method using a rhombic geogrid as claimed in claim 1, wherein in steps C and D, the U-shaped nail (4) is stably driven into the compacted pipe sheet (3) by a hammer while being fixed, or by a pneumatic and electric nailing gun.

7. The method according to claim 1, wherein in step E, the filler is spread by a light bulldozer or a front loader, the degree of compaction is measured after compaction, and the compaction is repeated at places that do not meet the requirement, so that the degree of compaction meets the specification.

8. A construction method using a rhombic geogrid as claimed in claim 1, wherein the tube sheet (3)3 is a PVC tube sheet (3), the tube sheet (3) is cut into strip-shaped pieces by a PVC pipe, and the size of the tube sheet (3) is 12 x 400 mm.

9. A construction method using a rhombic geogrid as claimed in claim 1, wherein the specification of the U-shaped nail (4) is 4cm x 25cm, phi 8 mm.

10. A construction method using a rhombic geogrid as claimed in any one of claims 1 to 9, characterized in that the filler is sand gravel.

Technical Field

The invention belongs to the technical field of roadbed filling, and relates to a construction method adopting a rhombic geogrid.

Background

The rhombic geogrid is formed by compounding a cross-linked three-dimensional grid and geotextile together through a hot melting technology, a net structure consisting of a plurality of equilateral hexagons is sequentially connected, nodes are formed at the intersection positions, three ribs are arranged in each equilateral hexagon, so that each stress point can be conveniently distributed in multiple directions of load, and the integral bearing capacity and deformation resistance are greatly improved. The rhombic geogrid is widely applied to civil engineering such as land formation, cofferdams, breakwaters, revetments, storage yards, water conservancy projects, seawalls, river banks and the like, is popularized and applied in municipal engineering at present, and has the functions of enhancing the shearing resistance of soil bodies, reinforcing the soil bodies, improving the integrity and the load capacity of the soil bodies and prolonging the service life of roadbeds. The laying construction quality of the rhombic geogrid is the key point of quality control of municipal road subgrade filling.

The conventional geogrid laying method is that geogrids are laid on the top of a flat and compacted foundation, one common connection mode of two adjacent geogrids is that the geogrids are connected through a sewing method, the two adjacent geogrids are sewn through interwoven high-strength polypropylene belts, however, the geogrids of the laying method have excessive stretching or damage risks after being stressed, the geogrid laying effect and the foundation treatment effect are seriously affected, the work efficiency is low, and the effect is poor.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a construction method adopting a rhombic geogrid, and the technical problems to be solved by the invention are as follows: how to improve the roadbed filling construction quality.

The purpose of the invention can be realized by the following technical scheme:

a construction method adopting a rhombic geogrid comprises the following steps:

A. firstly, backfilling a base layer of the roadbed by sand gravel, and compacting and leveling the backfilled base layer;

B. laying rhombic geogrids, and overlapping the two rhombic geogrids to form overlapping parts;

C. one side of the rhombic geogrid, which is far away from the lap joint part, is interwoven through lattices of the rhombic geogrid by using plastic steel belts, then the plastic steel belts are compressed by a plurality of pipe pieces, and the pipe pieces are fixed on the base layer by using U-shaped nails;

D. respectively interweaving two plastic steel belts to penetrate through lattices of two layers of rhombic geogrids at the lap joint part, then compacting the plastic steel belts by using a plurality of pipe pieces, and fixing the pipe pieces on the base layer by using U-shaped nails;

E. and after the rhombic geogrid is fixed, spreading the geogrid from two sides to the middle of the rhombic geogrid by using fillers, and compacting the geogrid.

The construction method comprises the steps of backfilling a base layer of the roadbed, compacting and leveling, laying the rhombic geogrid, fixing one side, far away from the overlapping part, of the roadbed by using a plastic steel belt, a duct piece and a U-shaped nail, fixing the overlapping part by using the plastic steel belt, the duct piece and the U-shaped nail, and paving and compacting by using a filler after fixing. According to the method, the plastic steel belts are interwoven to penetrate through the lattices of the rhombic geogrid, and a U-shaped nail anchoring mode is adopted, so that the tensile strength and the stability of the lapping part of the rhombic geogrid can be effectively improved, the flatness of the rhombic geogrid, excessive stretching and curling of the rhombic geogrid are effectively controlled, the risk of post-reworking treatment is reduced, and the roadbed filling construction quality is greatly improved.

In the above construction method using a rhombic geogrid, the method further comprises the following steps:

F. and D, removing the U-shaped nails, the pipe pieces and the plastic steel belts at one end of the rhombic geogrid, which is far away from the overlapping part, turning up one end of the rhombic geogrid, which is far away from the overlapping part, laying another rhombic geogrid, and repeating the steps B-E to realize the laying construction of the other rhombic geogrid.

In the construction method adopting the rhombic geogrid, in the step C, after the rhombic geogrid is fixed on the side away from the lap joint part, filling materials with the width of 1.5-2.0m are backfilled, and compaction is carried out.

In the construction method adopting the rhombic geogrid, in the step C, the distance between the plastic steel belt and one end, far away from the lap joint part, of the rhombic geogrid is more than 30cm, the plastic steel belt is interwoven and penetrates through lattices of the rhombic geogrid at intervals of 30 +/-5 cm, and the distance between two adjacent segments is 1.8-2.0 m.

In the construction method adopting the rhombic geogrid, in the step D, the width of the lap joint part is more than 30cm, the plastic steel strips are interwoven and penetrate through lattices of the rhombic geogrid at intervals of 30 +/-5 cm, and the distance between two adjacent pipe pieces is 1.8-2.0 m.

In the construction method using the rhombic geogrid, in the steps C and D, the U-shaped nail is stably driven into the compressed duct piece by a hammer through tapping a slow hammer when being fixed, or a pneumatic and electric piling nail gun is adopted to drive into the compressed duct piece.

In the construction method adopting the rhombic geogrid, in the step E, the filler is paved by a light bulldozer or a front loader, the compaction degree is measured after compaction, and the parts which do not meet the requirement are repeatedly rolled, so that the compaction degree meets the standard requirement.

In the construction method using the rhombic geogrid, the duct piece is a PVC (polyvinyl chloride) duct piece, the duct piece is cut into strip-shaped pieces through the PVC pipe, and the size of the duct piece is 12 x 400 mm.

In the construction method adopting the rhombic geogrid, the specifications of the U-shaped nails are 4cm multiplied by 25cm and 8 mm.

In the construction method using the rhombic geogrid, the filler is sand gravel.

Compared with the prior art, the invention has the following advantages:

1. the rhombic geogrid is laid in a mode that a plastic steel belt penetrates through the rhombic geogrid and a U-shaped nail is anchored, so that the tensile strength and the stability of the lap joint of the rhombic geogrid can be improved, the flatness of the geogrid and excessive stretching and curling of the geogrid are effectively controlled, the risk of post-processing reworking is reduced, and the filling construction quality of a soft roadbed is greatly improved.

2. After the rhombic geogrids are anchored, manual adjustment and mechanical tensioning of the rhombic geogrids are not needed in the backfill process of the upper-layer filler, and the construction cost is reduced.

3. The construction method can synchronously lay the rhombic geogrids and backfill and roll the geogrids, thereby greatly improving the construction efficiency.

Drawings

FIG. 1 is a block flow diagram of the present construction method;

FIG. 2 is a schematic view of a diamond geogrid as laid;

fig. 3 is a schematic view of another view of a diamond-shaped geogrid as laid.

In the figure, 1, lap joint; 2. plastic steel belts; 3. a duct piece; 4. a U-shaped nail.

Detailed Description

The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1-3, the construction method comprises the following steps:

A. firstly, backfilling a base layer of the roadbed by sand gravel, and compacting and leveling the backfilled base layer; backfilling, compacting and leveling, wherein hard protrusions such as broken stones and stones are strictly forbidden on the surface, and the running or the parking of all construction vehicles and construction machinery on the processed base layer is avoided;

B. laying rhombic geogrids, and overlapping the two rhombic geogrids to form an overlapping part 1;

C. one side of the rhombic geogrid, which is far away from the lap joint part 1, is interwoven through lattices of the rhombic geogrid by using a plastic steel belt 2, then the plastic steel belt 2 is tightly pressed by a plurality of pipe pieces 3, and the pipe pieces 3 are fixed on a base layer by using U-shaped nails 4;

D. two plastic steel belts 2 are respectively interwoven through lattices of two layers of rhombic geogrids at the lap joint part 1, then the plastic steel belts 2 are tightly pressed by a plurality of pipe pieces 3, and the pipe pieces 3 are fixed on a base layer by U-shaped nails 4; the plastic steel belt 2 has good toughness, strong brittleness, weather resistance and good stability, the laying quality of the rhombic geogrid is effectively ensured, and the technical parameters of the plastic steel belt 2 are shown in a table 1;

E. after the rhombic geogrid is fixed, spreading and compacting from two sides to the middle of the rhombic geogrid by using fillers; the rhombic geogrid is paved in place and then is filled with the filler in time, so that the long-time sunshine solarization or base layer water immersion is avoided, and generally, the interval time does not exceed 48 hours, and all construction vehicles and construction machines are prevented from running or being parked on the paved rhombic geogrid.

The construction method comprises the steps of backfilling a base layer of the roadbed, compacting and leveling, laying the rhombic geogrid, fixing one side, far away from the lap joint part 1, of the geogrid by using the plastic steel belt 2, the duct piece 3 and the U-shaped nail 4, fixing the lap joint part 1 by using the plastic steel belt 2, the duct piece 3 and the U-shaped nail 4, and paving and compacting by using a filler after fixing. According to the method, the plastic steel strips 2 are interwoven and penetrate through the lattices of the rhombic geogrid, and the U-shaped nails 4 are used for anchoring, so that the tensile strength and the stability of the lapping part of the rhombic geogrid can be effectively improved, the flatness of the rhombic geogrid, excessive stretching and curling of the rhombic geogrid are effectively controlled, the risk of later-stage reworking treatment is reduced, and the roadbed filling construction quality is greatly improved.

TABLE 1. Plastic steel band 2 technical parameter table

Nominal width (mm)	Nominal thickness (mm)	Weight per meter (g) g	Minimum tensile breakload/KN
				12.0	0.6	9.36	2.52

In this embodiment, the method further includes the following steps:

F. and D, removing the U-shaped nails 4, the pipe pieces 3 and the plastic steel belts 2 at one ends of the rhombic geogrids, far away from the overlapping parts 1, turning over one ends of the rhombic geogrids, far away from the overlapping parts 1, laying the other rhombic geogrid, and repeating the steps B-E to realize the laying construction of the other rhombic geogrid. Through the step F, the laying and backfilling rolling of the rhombic geogrid can be carried out synchronously, and the construction efficiency is greatly improved.

Preferably, in step C, after the side of the rhombic geogrid far away from the lap joint part 1 is fixed, filling materials with the width of 1.5-2.0m are filled back, and compacting is carried out. After the side, far away from the lap joint part 1, of the rhombic geogrid is fixed, 1.5-2.0m wide filler is backfilled, and edge curling can be effectively prevented.

Preferably, in the step C, the distance between the plastic steel strip 2 and one end of the rhombic geogrid, which is far away from the overlapping part 1, is more than 30cm, the plastic steel strip 2 is interwoven through lattices of the rhombic geogrid at intervals of 30 +/-5 cm, and the distance between two adjacent segments 3 is 1.8-2.0 m.

Preferably, in the step D, the width of the overlapping part 1 is more than 30cm, the plastic steel strips 2 are interwoven and penetrate through the lattices of the rhombic geogrid at intervals of every 30 +/-5 cm, and the distance between two adjacent pipe pieces 3 is 1.8-2.0 m.

Preferably, in the steps C and D, the U-shaped nail 4 is stably driven into the compressed duct piece 3 by a hammer when being fixed, or by a pneumatic or electric tacking gun. The U-shaped nail 4 is stably driven into the hammer by tapping the hammer or by adopting a pneumatic and electric nail setting gun when being fixed, so that the U-shaped nail 4 can be prevented from deforming and causing insufficient anchoring depth. If the ground nail is not convenient to drive in, broken stones at the top can be broken by an electric drill, or a large block of backfill at the bottom is smashed by the dowel bars and then driven in the U-shaped nail 4.

Preferably, in step E, the filler is paved by a light bulldozer or a front loader, the degree of compaction is measured after compaction, and the parts which do not meet the requirement are repeatedly rolled, so that the degree of compaction meets the requirement of the specification.

Preferably, the duct piece 3 is a PVC duct piece 3, the duct piece 3 is a strip-shaped piece cut by a PVC pipe, and the size of the duct piece 3 is 12 × 400 mm. The PVC pipe is good in heat resistance, toughness and ductility, has good tensile strength and compressive strength, and the diamond geogrid laying quality can be effectively guaranteed by using the PVC pipe to cut strip-shaped sheets.

Preferably, the staple 4 has a gauge of 4cm × 25cm and a diameter of 8 mm.

Preferably, the filler is sand gravel.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.