Road soft foundation construction shortcut structure with geogrid combined with gravel aggregates

Abstract

The utility model relates to a road soft foundation construction road structure combining geogrids and gravel aggregates. Existing construction shortcut soft foundation treatment measures have the problems that construction is complex, the manufacturing cost is high, drainage is not smooth, and roadbed diseases occur again. The structure comprises at least two permeable supporting combined layers, wherein each permeable supporting combined layer comprises a geogrid and gravel aggregates; the gravel aggregates are located on the surface of the geogrid, the edge of the geogrid is rolled up upwards and inwards to form a covered edge, and the gravel aggregates are wrapped in the covered edge. According to the utility model, the new geogrid structure is used for wrapping the gravel aggregates to form the shortcut roadbed which is good in water permeability and low in manufacturing cost, so that the problems of complicated construction process, high manufacturing cost and the like in the process of improving, replacing and filling a soft foundation are solved; meanwhile, the geogrid structure wraps the combined structure of the gravel particles, more complex and changeable loads can be borne, and the gravel particles and the like form a firmer interlocking structure.

Description

Technical Field

[0001] The utility model relates to the technical field of soft foundation highway construction, in particular to a road soft foundation construction access road structure combining geogrids with crushed stone granular materials. Background Art

[0002] Construction access roads are temporary road facilities for traffic construction. They can solve the transportation of construction tools, equipment and materials from off-site to the construction site and other traffic problems, maintain short-term traffic, and are built before the main project construction. Generally, lower construction standards are adopted to meet the use requirements. Usually, they will be demolished or abandoned after use. Although construction access roads are temporary projects, they are usually used until the main project is completed, throughout the entire construction process.

[0003] When carrying out highway construction in coastal areas, a large number of soft foundation construction conditions will be encountered. The soft soil in the soft foundation is fine-grained soil with high natural water content, large porosity, high compressibility and low shear strength. It is in a soft mud state and cannot be directly used as a construction access road. At present, the soft foundation is generally treated by improvement, replacement and other methods, and then gravel or concrete pavement is laid as a construction access road for the soft foundation of the road. However, the construction process is complicated and the cost is high. The construction access road foundation disease often reappears due to poor drainage.

[0004] Therefore, it is necessary to propose new measures to overcome the above-mentioned defects. Summary of the invention

[0005] The utility model aims to provide a road soft foundation construction access road structure combining geogrid with crushed stone granular material, so as to solve the problems of complex construction, high cost, poor drainage and recurrence of roadbed diseases in existing soft foundation treatment measures of construction access roads.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A geogrid combined with crushed stone aggregate soft foundation construction access road structure, the structure comprises at least two layers of permeable support combination layers, the permeable support combination layers comprising geogrid and crushed stone aggregate;

[0008] The crushed stone particles are located on the surface of the geogrid, and the edge of the geogrid is rolled up and inward to form an edge, and the crushed stone particles are wrapped in the edge.

[0009] Furthermore, the geogrid includes parallel ribs, and the parallel ribs in two directions cross each other to form a hexagonal grid structure.

[0010] Furthermore, the geogrid further comprises a central hole bar and a radiation bar;

[0011] The central hole bars are located in each hexagonal grid of the geogrid to form hexagonal holes;

[0012] The radiating strips are connected between vertices of the hexagonal holes and vertices of the hexagonal grid.

[0013] Furthermore, the edges on both sides of the geogrid are rolled up and inward to form a wrapping to wrap the crushed stone particles;

[0014] The geogrid longitudinal segments are spliced ​​in sequence.

[0015] Furthermore, the thickness of the water-permeable support composite layer is 20-30 cm.

[0016] Furthermore, the thickness of the water-permeable support combination layer decreases from bottom to top.

[0017] Furthermore, the edges on both sides of the geogrid are rolled inwards by at least 30 cm.

[0018] Furthermore, the permeable support composite layer is located in a longitudinal groove excavated on the soft foundation surface.

[0019] Furthermore, the transverse sides of the permeable support combination layer are roadbed slopes inclined upward.

[0020] Furthermore, the parallel ribs, the central hole bars and the radiation bars are all three-layer bars, the top surface and the ground surface are surface covering layers, and the middle is an energy absorbing interlayer.

[0021] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0022] The utility model provides a geogrid combined with crushed stone granules for road soft foundation construction. The new geogrid structure is used to wrap the crushed stone granules to form a road foundation with good water permeability and low cost, solving the problems of complex construction process and high cost in improving and replacing the soft foundation. At the same time, the combined structure of the geogrid structure wrapped with crushed stone granules can bear more complex and variable loads, so that the crushed stone granules and the like form a more solid interlocking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0024] Figure 1It is a cross-sectional view of a temporary access road structure for soft foundation construction in an embodiment of the utility model.

[0025] Figure 2 It is a vertical view of the geogrid in the embodiment of the utility model.

[0026] Figure 3 It is a plan view of the geogrid in the embodiment of the utility model.

[0027] Figure 4 It is a cross-sectional view of a geogrid in an embodiment of the utility model.

[0028] The symbols in the figure are:

[0029] 1-geogrid, 2-crushed stone aggregate, 3-parallel ribs, 4-center hole bars, 5-radial bars, 6-surface covering layer, 7-energy absorbing interlayer, 8-roadbed slope, 9-edging. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0031] In the description of the present invention, it should be understood that the terms "center", "up", "down", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "setting", etc. should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integral connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In a specific implementation, the length direction of the sidewalk is defined as the longitudinal direction, and the direction perpendicular to the length direction of the sidewalk is defined as the transverse direction.

[0034] The utility model provides a road soft foundation construction access road structure combining geogrid and crushed stone granular material, which is easy to construct, has strong water permeability, and meets the supporting force requirements. It is suitable for soft foundation road construction in coastal areas, fully meets the use requirements as a construction access road, and has low construction cost.

[0035] The structure comprises at least two layers of permeable support combination layers, and the permeable support combination layers comprise geogrid 1 and crushed stone aggregate 2. The crushed stone aggregate 2 is located on the surface of the geogrid 1, and the edge of the geogrid 1 is rolled up and inward to form a rim 9, and the crushed stone aggregate 2 is wrapped in the rim 9. The thickness of the permeable support combination layer is 20-30 cm. The thickness of the permeable support combination layer decreases from bottom to top.

[0036] The geogrid 1 has a special lattice structure, specifically including parallel ribs 3, center hole bars 4 and radial bars 5. The parallel ribs 3 in two directions cross each other to form a hexagonal grid structure. The center hole bars 4 are located in each hexagonal grid of the geogrid 1 to form a hexagonal hole. The radial bars 5 are connected between the vertices of the hexagonal holes and the vertices of the hexagonal grids.

[0037] The edges of the geogrid 1 on both sides are rolled up and inward to form a rim 9 to wrap the crushed stone granular material 2, and are rolled inward by at least 30 cm. The geogrid 1 is divided into longitudinal pieces and spliced ​​in sequence.

[0038] All permeable support composite layers are located in the longitudinal grooves excavated on the soft foundation surface. The lateral sides of the permeable support composite layers are slanting upward roadbed slopes 8. After the water flow of the roadbed slopes 8 converges to the permeable support composite layers, it can also quickly penetrate downwards.

[0039] In addition, the geogrid 1 of the utility model has a special layered structure, wherein the parallel ribs 3, the central hole bars 4 and the radiation bars 5 are all three-layer bars, the top surface and the ground are the surface covering layer 6, and the middle is the energy absorbing interlayer 7.

[0040] like Figure 1-4 In the embodiment, the permeable support composite layer is provided with two layers, namely, two layers of geogrid 1 and two layers of crushed stone aggregate 2, which are geogrid layer, crushed stone layer, geogrid layer and crushed stone layer from bottom to top, and the construction sequence is from bottom to top along the soil foundation.

[0041] The crushed stone layer is paved with crushed stone slag excavated on site. The particle size of the crushed stone should not exceed 50mm and the mud content should be less than 5%. Figure 1 As shown, the loose thickness of the crushed stone layer at the lower layer shall not be less than 34 cm to meet the thickness requirement of 30 cm after rolling, and the loose thickness of the crushed stone layer at the upper layer shall not be less than 24 cm to meet the thickness requirement of 20 cm after rolling.

[0042] The laying width of the geogrid layer at the upper layer is the sum of the width of the roadbed and the width of the wrapped gravel. The width of the roadbed is the width L specified in the design documents, and the width of the wrapped gravel is 120 cm. The laying width of the geogrid layer at the lower layer is the sum of the width of the roadbed and the width of the wrapped gravel. The width of the roadbed is the width L specified in the design documents, and the width of the wrapped gravel is 100 cm.

[0043] The geogrid 1 is laid along the route. If the length is insufficient, 60 cm is reserved to overlap with the geogrid 1 of the next section. The covering material is selected as required for paving and the access road traffic is restored.

[0044] The geogrid 1 is formed as a whole by punching and directional stretching three layers of material, specifically including a hard and durable energy-absorbing interlayer 7 and two ductile surface covering layers 6. The energy-absorbing interlayer 7 can be a geogrid made of a high molecular nano-energy-absorbing polymer, which serves as the skeleton and force-bearing material of the entire geogrid structure. (TX) three-dimensional geogrid (produced by Tensar Geosynthetics (China) Co., Ltd.). The surface covering layer 6 is made of general polypropylene material to protect the internal energy absorbing interlayer 7, reduce aging, and enhance the interaction between the geogrid 1 and the crushed stone granules 2. In the geogrid 1 of the utility model, the energy absorbing interlayer 7 has an energy absorbing effect, and the surface covering layer 6 has a protective effect. The present application is not limited to the above materials, and any material having the above effects can be used for the implementation of the utility model.

[0045] The specific construction process of the above embodiment is as follows:

[0046] S1: Lay the first layer of geogrid flat;

[0047] S2: Then spread and roll the first layer of crushed stone to the designed elevation, and wrap the crushed stone with the first layer of geogrid. The thickness of the crushed stone in the wrapping layer is 30 cm.

[0048] S3: Lay the second layer of geogrid flat;

[0049] S4: Then the second layer of crushed stone is spread and rolled to the designed elevation, and the crushed stone is wrapped with the second layer of geogrid, and the thickness of the crushed stone in the wrapping layer is 20 cm;

[0050] S5: Finally, select the surface material as required for paving and restore the access road traffic.

[0051] The road soft foundation construction access road structure of the utility model has multiple permeable support combination layers composed of geogrids and crushed stone particles. It not only has strong water permeability and smooth drainage, but also has a supporting force sufficient to meet the use requirements of the access road. It has better integrity and can adapt to larger uneven settlements. It has low cost and is easy to construct, and can effectively prevent the recurrence of roadbed diseases.

[0052] The above specific examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. For those skilled in the art of the present invention, some simple deductions, deformations or substitutions can be made based on the idea of ​​the present invention.

Claims

1. A road soft foundation construction access road structure combining geogrid and crushed stone granular materials, characterized by: The structure comprises at least two layers of permeable support composite layers, wherein the permeable support composite layers comprise geogrids (1) and crushed stone aggregates (2); The crushed stone particles (2) are located on the surface of the geogrid (1), and the edge of the geogrid (1) is rolled up and inward to form an edge (9), and the crushed stone particles (2) are wrapped in the edge (9).

2. The road soft foundation construction access road structure of geogrid combined with crushed stone granules according to claim 1 is characterized by: The geogrid (1) comprises parallel ribs (3), and the parallel ribs (3) in two directions intersect each other to form a hexagonal grid structure.

3. The road soft foundation construction access road structure of geogrid combined with crushed stone granular material according to claim 2 is characterized by: The geogrid (1) further comprises a central hole bar (4) and radial bars (5); The central hole bars (4) are located in each hexagonal grid of the geogrid (1) to form hexagonal holes; The radiation strips (5) are connected between the vertices of the hexagonal holes and the vertices of the hexagonal grid.

4. The road soft foundation construction access road structure of geogrid combined with crushed stone granular material according to claim 3 is characterized by: The edges of the geogrid (1) on both sides in the transverse direction are rolled up and inward to form a wrapping (9) to wrap the crushed stone particles (2); The geogrid (1) is longitudinally divided into sections and spliced ​​in sequence.

5. The road soft foundation construction access road structure of geogrid combined with crushed stone granular material according to claim 4 is characterized by: The thickness of the water-permeable support composite layer is 20-30 cm.

6. The geogrid combined with crushed stone aggregate soft foundation construction access road structure according to claim 5, characterized in that: The thickness of the water-permeable support combination layer decreases from bottom to top.

7. The road soft foundation construction access road structure of geogrid combined with crushed stone granular material according to claim 6 is characterized by: The edges of the geogrid (1) on both sides in the transverse direction are rolled inwards by at least 30 cm.

8. The geogrid combined with crushed stone aggregate soft foundation construction access road structure according to claim 7, characterized in that: The permeable support composite layer is located in a longitudinal groove excavated on the soft foundation surface.

9. The road soft foundation construction access road structure of geogrid combined with crushed stone granular material according to claim 8, characterized in that: The transverse sides of the permeable support composite layer are roadbed side slopes (8) inclined upward.

10. The road soft foundation construction access road structure of geogrid combined with crushed stone granular material according to claim 9, characterized in that: The parallel ribs (3), the central hole strips (4) and the radiation strips (5) are all three-layer strip bodies, the top surface and the ground surface are the surface covering layer (6), and the middle is the energy absorbing interlayer (7).

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