阅读说明：本技术 一种土方路基改扩建锚拉式土工格栅及其施工方法 (Anchored geogrid for reconstruction and extension of earthwork roadbed and construction method thereof ) 是由 贺超 黄兆龙 黄泽鹏 李鑫 余杰 于 2021-09-28 设计创作，主要内容包括：本发明涉及路基改扩建技术领域,尤其涉及一种土方路基改扩建锚拉式土工格栅及其施工方法。包括锚固部位,连接部位。在原有路基与扩建连接部位采用垂直开挖,挖至新填筑基底后,沿道路纵向每隔1m-2m间距人工击入一根锚拉杆,完成该段击入后铺设拓宽段土工格栅,连接锚拉格栅与扩宽段土工格栅,回填土方,碾压密实,按上个流程继续进行下层施工。(The invention relates to the technical field of roadbed reconstruction and extension, in particular to an anchored geogrid for earthwork roadbed reconstruction and extension and a construction method thereof. Comprises an anchoring part and a connecting part. The method comprises the steps of adopting vertical excavation at the connection part of an original roadbed and an extension, after excavating to a newly filled foundation, manually driving an anchor rod along the longitudinal direction of a road at intervals of 1-2 m, laying an expanded section of geogrid after driving the section, connecting the anchor rod with the expanded section of geogrid, backfilling earth, rolling tightly, and continuing to perform lower-layer construction according to the previous process.)

1. The utility model provides an earthwork roadbed rebuilds and expands anchor formula geogrid, its characterized in that, this earthwork roadbed rebuilds and expands anchor formula geogrid includes that the anchor of strip structure draws grid (1), anchor grid (1) is including being arranged in bayonet anchor position (5) of installing in original road bed (12) to and connection position (6), connection position (6) are used for connecting and lay at the widening section geogrid (11) of enlargement road bed (14).

2. The earthwork roadbed reconstruction and expansion anchoring geogrid as claimed in claim 1, wherein the anchoring grid (1) further comprises a reverse boring bar (2) which is just connected to the anchoring part (5), and the anchoring grid (1) and the reverse boring bar (2) are rigidly connected.

3. The earthwork roadbed rebuilding and expanding anchor geogrid and the construction method thereof according to claim 1, wherein the connection portion (6) comprises an upper connection portion (3) and a lower connection portion (4) connected to the anchor portion (5), and a holding space for holding the geogrid (11) of the expanded section is left between the upper connection portion (3) and the lower connection portion (4).

4. The earthwork roadbed rebuilding and expanding anchor geogrid and the construction method thereof according to claim 3, wherein the connection portion (6) is rigidly connected with the anchor portion (5).

5. The earthwork roadbed rebuilding and expanding anchored geogrid and the construction method thereof according to claim 2, wherein the anchored geogrid (1) is galvanized steel bar, and the reverse steel bar (2) is made of the same material as the anchored geogrid (1).

6. The earthwork roadbed rebuilding and expanding anchored geogrid and the construction method thereof according to claim 1, wherein the end part of the anchored geogrid (1) is pointed.

7. The earthwork roadbed rebuilding and expanding anchor geogrid and the construction method thereof according to claim 2, wherein the reverse drilling rod (2) is of a sheet-like structure and comprises a fixed sheet attached to the anchoring part (5) and a bent sheet forming an acute angle with the anchoring part (5), and the fixed sheet and the bent sheet are of an integral bent structure.

8. The earthwork roadbed rebuilding and expanding anchor type geogrid and the construction method thereof according to claim 7, wherein the fixing pieces and the bending pieces of the reverse chisels (2) are bent at 30-60 °.

9. A construction method of an earthwork roadbed reconstruction and extension anchored type geogrid, which is characterized in that the earthwork roadbed reconstruction and extension anchored type geogrid as claimed in any one of claims 1 to 8 is adopted for roadbed extension, and comprises the following construction steps:

A. vertically excavating the connecting part of the original roadbed (12) and the expanded roadbed (14) until a new filling foundation is excavated;

B. the anchor grid (1) is driven into the road along the longitudinal direction of the road at a set interval; paving a widening section geogrid (11) on a connecting part (6) of the anchor pulling grid (1), and connecting the anchor pulling type geogrid (13) with the widening section geogrid (11);

C. backfilling the soil body of the expanded roadbed (14), and rolling and compacting;

D. and D, repeating the steps B and C until the earth roadbed is constructed at the next section of road required to be paved.

10. The method of claim 9, wherein the reverse anchor (2) connected to the anchoring portion (5) is anchored into the soil along the original geogrid installation portion while driving the anchor grid (1) in step B, so that the geogrid (11) of the widened section connected to the connecting portion (6) is maintained on the same horizontal plane.

Technical Field

The invention relates to the technical field of roadbed reconstruction and extension, in particular to an anchored geogrid for earthwork roadbed reconstruction and extension and a construction method thereof.

Background

With the continuous development of city construction, the conventional road cannot meet the social demand which is gradually improved. Therefore, it is imperative to rebuild the conventional road. The reconstruction and extension of the road subgrade are very important links in the reconstruction of the road, not only affect the structure of the original subgrade, but also require that the expanded subgrade and the original subgrade form an integral structure after the construction is completed, if the improper treatment can cause damage to the original road to a certain degree, and the structural safety of the later operation of the road can also have influence.

In the prior art, as shown in fig. 3, a method of excavating an original roadbed 12 into multiple steps is generally adopted, then each step and an expanded roadbed 14 are constructed simultaneously, an expanded section of geogrid 11 is laid according to design requirements to reinforce the roadbed strength, when the expanded section of geogrid 11 is laid, one end of the expanded section of geogrid 11 is laid on the step of the original roadbed 12, the other end of the expanded section of geogrid is laid on the expanded roadbed 14, then the expanded roadbed is continuously filled and compacted, and when the expanded section of geogrid 11 is required to be laid at the previous height, the expanded section of geogrid 11 is laid in the same manner. The method for reconstructing and expanding the roadbed mainly has the following problems:

1. the excavation amount of the original roadbed 12 is large, so that the cost is high, and the construction period progress is influenced;

2. the original roadbed 12 needs to be excavated step by step, the excavation depth of each step basically corresponds to the height of the geogrid to be laid, the excavation depth is difficult to control, and the construction difficulty is high;

3. the original roadbed 12 is excavated in a large area, the original roadbed 12 is damaged, huge waste is caused, and the construction cost is too high.

Disclosure of Invention

At least one of the objects of the present invention is to provide an anchor geogrid for modifying and extending an earthwork subgrade and a construction method thereof, in view of the problems of the prior art that roadbed modifying and extending projects have large damage to the existing roads, large construction work amount and large construction difficulty. The anchoring type geogrid for modifying and expanding the earthwork roadbed and the construction method thereof can solve the problem of integral stress of the original roadbed and the expanded roadbed, so that a new roadbed and an old roadbed form an integral structure; the problems of large damage to the original roadbed and huge construction amount are solved. The construction difficulty is low, the operation is easy, and the method is suitable for all construction working conditions needing to be connected with the original roadbed extension. Compared with the old multi-stage excavation, the method is more economical and efficient.

In order to achieve the above object, the present invention adopts the following aspects.

The utility model provides an earthwork roadbed rebuilds extension anchor formula geogrid, this earthwork roadbed rebuilds extension anchor formula geogrid is including having the anchor grid of point form tip, and this anchor grid is the strip structure, including the anchor position that is arranged in bayonet installation original road bed to and be arranged in burying the connection position in the extension road bed underground, it is connected with the widening section geogrid of laying at the extension road bed to connect the position.

Preferably, the anchor laggard further comprises a reverse braze just above the anchoring site. The anchor grid and the three reverse chisels are rigidly connected, the rigid connection mode comprises but is not limited to bolt connection and weld joint connection, the anchor grid and the reverse chisels can be directly made into a whole during manufacturing, and the anchor grid and the reverse chisels are enabled to have integrity through the rigid connection mode.

Furthermore, the connecting part comprises an upper connecting part and a lower connecting part which are connected to the anchoring part, and a clamping space for clamping the geogrid of the widening section is reserved between the upper connecting part and the lower connecting part. The geogrid is used for clamping the widening section to form a new connecting system.

Preferably, the connection site is rigidly connected to the anchoring site. The rigid connection mode includes but is not limited to bolt connection and welding connection. But preferably the two parts are made integral at the time of manufacture, which may provide the invention with greater integrity.

Further, the anchor Lag grid is made of galvanized steel. The reverse drill rod is made of a material consistent with the anchor Lag grating. The same material is adopted, so that the preparation and the manufacture are more convenient without purchasing a plurality of materials, and a series of problems caused by inconsistent material can not occur during the manufacture by using the same material.

Preferably, the end part of the anchor laggard grid is pointed, and the pointed anchor is adopted to pull the end of the grid, so that labor is saved when the whole anchor is driven into a soil body.

Preferably, the fixing piece and the bending piece of the reverse chisel are bent to 30-60 degrees, as the invention, the reverse chisel is bent to 45 degrees at 2/7 degrees just before the connection, and the reverse chisel is bent to anchor the original geogrid.

Furthermore, the reverse drill rod is of a sheet-shaped structure and comprises a fixing piece and a bending piece, wherein the fixing piece is attached to the anchoring part, the bending piece forms an acute angle with the anchoring part, and the fixing piece and the bending piece are of an integrated bending structure. The back-off drill rod has elasticity relative to the anchor laggard grid, when the back-off drill rod and the anchor laggard grid are driven into a soil body together, the pressure of the soil body flattens the bending part, after the back-off drill rod is driven into the soil body, the anchor laggard grid can not be outwards withdrawn, when the back-off drill rod is subjected to an outwards pulling force, the back-off drill rod can form a certain angle with the anchor laggard grid by means of the elasticity of the back-off drill rod, the soil body between the back-off drill rod and the anchor laggard grid can prevent the anchor steel rod from being outwards withdrawn, and the foundation earthwork is guaranteed to be rebuilt, the anchor laggard and expanded geotechnical grid and the soil body form an integral anchoring structure.

Preferably, when the earthwork roadbed is rebuilt and expanded by the anchor type geogrid for roadbed expansion, the method mainly comprises the following construction steps:

A. vertically excavating the connecting part of the original roadbed and the expanded roadbed until a new filling foundation is excavated;

B. hammering the anchor grids along the longitudinal direction of the road at set intervals; paving a widening section geogrid on a connecting part of the anchor pulling grid, and connecting the anchor pulling grid and the widening section geogrid;

C. backfilling soil bodies of the expanded roadbed, and rolling and compacting;

D. and D, repeating the steps B and C until the earth roadbed is constructed at the next section of road required to be paved.

Further, the construction method for rebuilding and expanding the anchor-pulling type geogrid on the earthwork roadbed is characterized in that when the anchor-pulling type geogrid is driven in the step B, the reverse drill rod connected to the anchoring part is anchored into soil along the installation part of the original geogrid, and the original geogrid and the geogrid of the widening section connected with the connecting part are kept on the same horizontal plane. The original geogrid and the geogrid of the widening section are connected through the invention, so that the original geogrid and the geogrid of the widening section can be approximately regarded as a new geogrid which is integrally enlarged.

In summary, due to the adoption of the technical scheme, the invention at least has the following beneficial effects:

1. by adopting the anchor-pull type geogrid for reconstruction and expansion of the earthwork roadbed to carry out construction, the original roadbed can be vertically excavated, so that the excavation amount is small, the cost is low, and the construction period is short; 2. the original roadbed does not need to be excavated step by step, and the vertical excavation construction difficulty is small; 3. the damage to the original roadbed is small, and the construction cost is reduced. 4. The application range is wide, and the method not only can be applied to roadbed extension and transformation, but also can be applied to slope protection work.

Drawings

Fig. 1 is a schematic structural view of an earth roadbed rebuilding and expanding anchor type geogrid according to an exemplary embodiment of the present invention.

Fig. 2 is a schematic size view of the connection portion of fig. 1.

Fig. 3 is a schematic structural diagram of roadbed extension construction in the prior art.

Fig. 4 is a schematic view of an earth roadbed rebuilding and expansion anchor type geogrid construction structure according to an exemplary embodiment of the present invention.

Fig. 5 is a front view of an earth roadbed reconstruction extension anchor type geogrid according to an exemplary embodiment of the present invention.

In the drawings: 1-anchoring grid, 2-inverted drill rod, 3-upper connecting part, 4-lower connecting part, 5-anchoring part, 6-connecting part, 7-connecting buckle, 11-widened section geogrid, 12-original roadbed, 13-anchoring geogrid and 14-expanded roadbed.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments, so that the objects, technical solutions and advantages of the present invention will be more clearly understood. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 shows a schematic structural diagram according to an exemplary embodiment of the present invention. The structure of the embodiment shown in fig. 1 and 5 mainly includes: the anchor grid 1, the reverse brazes 2, the upper connecting portions 3, the lower connecting portions 4, and the relative positional relationships such as "upper" and "lower" are described herein only for the purpose of describing the embodiments with reference to the drawings, and the "upper" and "lower" positional relationships may be changed in practical applications, so the upper connecting portions 3 and the lower connecting portions 4 may also be referred to as first connecting portions and second connecting portions. The anchoring portion 5 comprises: the anchor grid 1 and the reverse brazing filler metal 2 are rigidly connected to form a connecting part 6, and the upper connecting part 3 and the lower connecting part 4 form a connecting part 6. The anchor grid 1 and the three reverse brazes 2 can be all rigidly connected. The rigid connection mode includes but is not limited to bolt connection and welding connection. The anchor Lag grating 1 and the reverse brazing filler metal 2 can be directly manufactured into a whole during manufacturing, and the structural strength is higher. This provides better integrity in use. The upper connecting part 3 and the lower connecting part 4 are rigidly connected with the anchor Lagrange gate 1. The rigid connection mode includes but is not limited to bolt connection and welding connection. It is also possible to directly integrate the upper connecting portion 3 and the lower connecting portion 4 with the anchor grid 1 during manufacture, thus providing better integrity during use. The end part of the anchor pull grid 1 is pointed. The pointed anchoring grid 1 end can save more labor when the whole body is driven into the soil body. The included angle between the fixing piece and the bending piece of the reverse brazing rod 2 is 30-60 degrees, and the included angle is an acute angle between the bending piece and the fixing piece, namely a plane included angle where the bending piece and the fixing piece are located in the figure. Preferably, the reverse chisel 2 is bent 45 degrees at 2/7 before connecting for anchoring the original geogrid. Another embodiment is that the end of the connecting part 6 is provided with a connecting buckle 7, and the connecting buckle 7 prevents the geogrid from moving left and right in the connecting part 6 due to external factors, so that the whole body has better stability. Preferably, the anchor laggard 1 driven into the earth as shown in figure 2 is 5cm wide and 5mm thick. The bit width c of a connecting part of the reverse brazing filler metal 2 and the anchor Lag grid 1 is 3cm, the length b is 2cm, the length a of the bending part is 5cm, and the thickness is 5 mm. The length d of the anchoring part 5 is 55cm, and the length e of the connecting part 6 is 15 cm. The anchor grid 1 has a tip length a of 5 cm. The thickness aa of the upper connecting portion 3, the thickness aa of the lower connecting portion 4, and the distance ab between the upper and lower connecting portions are 1mm and 5mm, respectively. The thickness bb of the upper connecting part 3 connected with the new expanded section geogrid is 2mm, the thickness bb of the lower connecting part 4 is 2mm, and the distance ba of the middle part is 3 mm.

Fig. 4 illustrates an operation structure diagram of an exemplary embodiment of the present invention. The operation flow of the embodiment mainly comprises the following steps: the anchor-pull type geogrid structure is adopted, one geogrid which is used for driving into an existing road base layer is lapped with a plurality of branch geogrids, the plurality of branch geogrids are used for filling and building an expanded soil body, an external geogrid is in lap joint with each layer of laid geogrids, and one layer is filled and hit. In the process of laying the geogrid, the anchoring grids 1 are driven in according to the design requirements. And (3) driving an anchor rod at intervals of 1-2 m along the longitudinal direction of the road, paving a widening section of geogrid 11 after the section is driven, driving the anchor Lag grid 1 into the soil body by adhering the anchor Lag grid to the lower part of the original geogrid, and then pulling the anchor Lag grid 1 inwards and outwards until the anchor Lag grid is not pulled outwards, which indicates that the reverse drill rod 2 is anchored into the soil body. The geogrid 11 of the widened section is laid and inserted into the connecting position 6, and then the geogrid 11 of the widened section is fixed on the connecting position 6 through the connecting buckle 7. Backfilling earthwork, rolling and compacting, and continuing to perform lower-layer construction according to the previous flow.

The foregoing is merely a detailed description of specific embodiments of the invention and is not intended to limit the invention. Various alterations, modifications and improvements will occur to those skilled in the art without departing from the spirit and scope of the invention.