Roadbed structure of soft soil foundation

Abstract

The utility model provides a roadbed structure of a soft soil foundation, which relates to the technical field of roadbed structures and comprises a soft foundation layer, a soil filling layer, a pavement layer and a reinforcing mechanism. According to the roadbed structure of the soft soil foundation, the geotechnical grid is flatly laid and placed on the soft foundation layer, the pouring pipes are inserted into the threaded pipe openings in the two ends of the geotechnical grid, the conical heads move downwards to be inserted into the soft foundation layer below, the threaded connectors and the threaded pipe openings are fixed together through the threaded sleeves, the reinforcing mechanisms are fixed, and the pouring pipes are filled with cement paste; cement paste flows out from the grouting holes in the bottom and the peripheral side of the grouting pipe through the pipe cavity and diffuses towards the periphery, in the grouting process, pressure can be generated when the cement paste is injected into the soft base soil layer, loose soil particles in the soft base soil body are squeezed towards the peripheral side through the pressure to be densified, and after the cement paste is solidified in the soil layer, a solid cementing material is formed. Loose soil particles are bonded together, so that the shear strength and the bearing capacity of a soil body are improved, and sedimentation and deformation are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of subgrade structures, in particular to a subgrade structure for soft soil subgrade. Background Technique

[0002] The subgrade structure for soft soil subgrade is a special design for road construction under soft soil conditions. Soft soil subgrade refers to soil layers with soft texture and low bearing capacity, such as silt, clay or saturated soil. Due to the physical properties of these soils, directly building a road on soft soil may lead to instability, settlement or deformation, and reinforcement measures need to be taken to ensure the stability and durability of the road.

[0003] Soft soil subgrade is prone to settlement problems, which will affect the stability and safety of the road. It is very necessary to efficiently reinforce the soft soil subgrade, which can enhance the strength and stability of the soil mass, enable the subgrade to bear greater loads, reduce the settlement caused by local compression, and thus ensure the long-term stability and durability of the subgrade. Content of the Utility Model

[0004] The utility model provides a subgrade structure for soft soil subgrade, achieving the effects of enhancing the strength and stability of the soil mass, enabling the subgrade to bear greater loads, reducing the settlement caused by local compression, and thus ensuring the long-term stability and durability of the subgrade as proposed in the above background technique.

[0005] To achieve the above object, the utility model provides the following technical solution: A subgrade structure for soft soil subgrade, including a soft base layer, a filling layer, a road surface layer and a reinforcement mechanism. The filling layer is arranged at the upper end of the soft base layer, the road surface layer is arranged at the upper end of the filling layer, the reinforcement mechanism is embedded in the filling layer. The reinforcement mechanism includes a geogrid and a perfusion assembly. The geogrid is arranged in the filling layer, and multiple groups of the perfusion assemblies are arranged through the upper surface of the geogrid. The perfusion assembly includes a perfusion pipe and a cone head. The perfusion pipe is arranged through the geogrid, the cone head is fixedly connected to the lower end of the perfusion pipe, and the cone head is inserted into the soft base layer. A pipe cavity is formed inside the perfusion pipe, and the pipe cavity communicates the perfusion pipe with the cone head. A group of grouting holes are arranged on the circumferential side surface of the perfusion pipe at the same height, and a plurality of grouting holes are arranged in a group.

[0006] Preferably, the geogrid is formed by fixing multiple grid units in a grid arrangement.

[0007] Preferably, the perfusion assembly further includes a threaded connection head, and the threaded connection head is fixed to the upper end of the perfusion pipe.

[0008] Preferably, a threaded pipe orifice is fixedly connected to the connection node of the grid unit, and the perfusion pipe is inserted into the threaded pipe orifice.

[0009] Preferably, a threaded sleeve is threadedly connected to the circumferential side of the threaded connector, and the threaded sleeve is screwed downward to fix the threaded connector to the threaded pipe orifice.

[0010] Preferably, the inner diameter of the lumen gradually decreases from top to bottom.

[0011] Preferably, multiple groups of grouting holes are arranged along the length direction of the perfusion pipe, and the grouting holes communicate with the lumen.

[0012] Preferably, a cavity is formed between the open end of the conical head and the perfusion pipe.

[0013] Preferably, the cross-section of the grid unit is in the shape of an I, and the upper and lower surfaces of the grid unit are both friction-rough surfaces.

[0014] Preferably, an expansion flat ring is fixedly connected to the circumferential side of the upper end of the threaded connector.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. Lay the geogrid flat on the soft subgrade, insert the perfusion pipes into the threaded pipe orifices at both ends of the geogrid, hammer the expansion flat ring, the conical head moves downward and inserts into the lower soft subgrade, so that the bottom of the threaded connector at the upper end of the perfusion pipe contacts the threaded pipe orifice, and screw the threaded sleeve downward, so that the lower part of the threaded sleeve is screwed into the threaded pipe orifice, thereby fixing the threaded connector to the threaded pipe orifice, fixing the reinforcement mechanism, fill the perfusion pipe with cement slurry, and the cement slurry flows out from the bottom and the circumferential grouting holes of the perfusion pipe and diffuses around. During the grouting process, pressure will be generated when the cement slurry is injected into the soft subgrade soil layer. This pressure squeezes the loose soil particles in the soft subgrade soil body to the circumferential side to make it densified. The fluidity of the cement slurry ensures its uniform filling of the voids in the soil layer. After the cement slurry solidifies in the soil layer, a solid cementing material is formed to bond the loose soil particles together, improving the shear strength and bearing capacity of the soil body and reducing settlement and deformation.

[0017] 2. Fill the reinforcement mechanism with soil to form a fill layer, and then lay a road surface layer above the fill layer. When the road surface layer is subjected to a load, through the grid-like arranged grid units, the vertically downward force is dispersed to the surrounding, which can effectively disperse and transfer the load on the road surface layer, reduce the local bearing pressure of the soil body, and further reduce the risk of settlement and deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the roadbed structure of the soft soil foundation of the present utility model;

[0019] Figure 2Structural schematic diagram of the reinforcement mechanism of the present utility model;

[0020] Figure 3 is Figure 2 enlarged view of part A;

[0021] Figure 4 Structural schematic diagram of the grid unit of the present utility model;

[0022] Figure 5 is Figure 4 sectional view taken along line B-B;

[0023] Figure 6 Structural schematic diagram of the perfusion assembly of the present utility model;

[0024] Figure 7 Internal sectional view of the perfusion assembly of the present utility model.

[0025] Reference numerals in the figure: 1, soft base layer; 2, fill soil layer; 3, road surface layer; 4, reinforcement mechanism; 41, geogrid; 411, grid unit; 412, threaded pipe orifice; 42, perfusion assembly; 421, threaded connection head; 4211, expanded flat ring; 422, perfusion pipe; 4221, pipe cavity; 4222, grouting hole; 4223, conical head; 4224, cavity; 423, threaded sleeve. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] The present utility model provides a subgrade structure for soft soil subgrade, as Figure 1 shown, including a soft base layer 1, a fill soil layer 2 and a road surface layer 3. The fill soil layer 2 is provided at the upper end of the soft base layer 1, and the road surface layer 3 is provided at the upper end of the fill soil layer 2. It is characterized in that it further includes a reinforcement mechanism 4 for reinforcing the soft soil subgrade. The reinforcement mechanism 4 is embedded in the fill soil layer 2. The reinforcement mechanism 4 includes a geogrid 41 and a perfusion assembly 42. The geogrid 41 is provided in the fill soil layer 2. The reinforcement mechanism 4 is laid flat on the soft base layer 1 for fixation, the fill soil layer 2 is formed by covering the reinforcement mechanism 4 with soil, and then the road surface layer 3 is laid above the fill soil layer 2.

[0028] As Figure 2 shown, the geogrid 41 is formed by fixing a plurality of grid units 411 in a grid pattern, as Figure 4 and Figure 5As shown, the cross section of the grid unit 411 is I-shaped, and the upper and lower surfaces of the grid unit 411 are both friction rough surfaces. When the pavement layer 3 is subjected to a load, the vertical downward force is dispersed to the surroundings through the grid units 411 arranged in a grid shape, which can effectively disperse and transmit the load on the pavement layer 3, reduce the local bearing pressure of the soil, and reduce the risk of settlement and deformation. The I-shaped cross section increases the rigidity and stability of the geogrid 41, improves the resistance to vertical and lateral loads, and the rough surface provides greater friction, enhances the shear resistance between the grid and the soil, and prevents slippage.

[0029] like Figure 2 and Figure 3 As shown, multiple groups of injection components 42 are arranged through the upper surface of the geogrid 41, and the connection nodes of the grid units 411 are fixedly connected with threaded pipe mouths 412, and the injection pipes 422 are inserted into the threaded pipe mouths 412. The injection components 42 include a threaded connector 421, which is fixed to the upper end of the injection pipe 422, and an expansion flat ring 4211 is fixedly connected to the peripheral side of the upper end of the threaded connector 421, and a threaded sleeve 423 is threadedly connected to the peripheral side of the threaded connector 421, and the threaded sleeve 423 is twisted downward to fix the threaded connector 421 and the threaded pipe mouth 412. Insert the injection pipe 422 into the threaded pipe openings 412 at both ends of the geogrid 41, hammer the expansion flat ring 4211, and move the cone head 4223 downward to insert it into the soft base layer 1 below. The cavity 4224 on the cone head 4223 can provide resistance for pulling the injection pipe 422 outward, so that the cone head 4223 can be stably inserted into the soft base layer 1, and fix the geogrid 41 so that the bottom of the threaded connector 421 at the upper end of the injection pipe 422 contacts the threaded pipe opening 412, and twist the threaded sleeve 423 downward so that the lower end portion of the threaded sleeve 423 is screwed into the threaded pipe opening 412, thereby fixing the threaded connector 421 and the threaded pipe opening 412 together, and fixing the reinforcement mechanism 4.

[0030] like Figure 6 and Figure 7As shown, the perfusion assembly 42 further includes a perfusion pipe 422 and a tapered head 4223. The perfusion pipe 422 is disposed through the geogrid 41, and the tapered head 4223 is fixedly connected to the lower end of the perfusion pipe 422 and inserted into the soft subgrade 1. A lumen 4221 is formed inside the perfusion pipe 422, and the lumen 4221 penetrates the perfusion pipe 422 and the tapered head 4223. The inner diameter of the lumen 4221 gradually decreases from top to bottom. A cavity 4224 is formed between the open end of the tapered head 4223 and the perfusion pipe 422. A set of grouting holes 4222 is provided on the circumferential side surface of the perfusion pipe 422 at the same height. There are multiple grouting holes 4222 in a set, and multiple sets of grouting holes 4222 are arranged along the length direction of the perfusion pipe 422. The grouting holes 4222 communicate with the lumen 4221. In order to further reinforce the soft subgrade 1, the number of the reinforcement mechanisms 4 disposed on the geogrid 41 can be increased. Cement slurry is filled into the perfusion pipe 422, and the cement slurry flows out through the lumen 4221 from the bottom and the circumferential grouting holes 4222 of the perfusion pipe 422 and diffuses around. The gradually decreasing inner diameter of the lumen 4221 helps to gradually increase the flow rate and pressure of the cement slurry during the grouting process, which can ensure the flow stability and uniformity of the cement slurry when it is injected into the soil of the soft subgrade 1. During the grouting process, pressure is generated when the cement slurry is injected into the soil layer of the soft subgrade 1. This pressure squeezes the loose soil particles in the soil of the soft subgrade 1 to the circumferential side, making it densified. The fluidity of the cement slurry ensures that it evenly fills the voids in the soil layer. After the cement slurry solidifies in the soil layer, it forms a solid cementitious material, which binds the loose soil particles together, improves the shear strength and bearing capacity of the soil, and reduces settlement and deformation.

[0031] Using the present utility model, as Figure 1 and Figure 2As shown, the geogrid 41 is laid flat on the soft subgrade 1. The perfusion pipes 422 are inserted into the threaded pipe orifices 412 at both ends of the geogrid 41. The expansion flat rings 4211 are hammered, and the cone heads 4223 move downward and are inserted into the underlying soft subgrade 1, so that the bottom of the upper threaded connection head 421 of the perfusion pipe 422 contacts the threaded pipe orifice 412. The threaded sleeve 423 is rotated downward, so that the lower part of the threaded sleeve 423 is screwed into the threaded pipe orifice 412, and then the threaded connection head 421 and the threaded pipe orifice 412 are fixed together, and the reinforcement mechanism 4 is fixed. Cement slurry is filled into the perfusion pipe 422, and the cement slurry flows out from the bottom and the peripheral grouting holes 4222 of the perfusion pipe 422 through the pipe cavity 4221 and diffuses around. During the grouting process, pressure will be generated when the cement slurry is injected into the soil layer of the soft subgrade 1. This pressure squeezes the loose soil particles in the soil body of the soft subgrade 1 to the periphery, making it densified. The fluidity of the cement slurry ensures its uniform filling of the voids in the soil layer. After the cement slurry solidifies in the soil layer, a solid cementing material is formed, which binds the loose soil particles together, improves the shear strength and bearing capacity of the soil body, reduces settlement and deformation. The reinforcement mechanism 4 is covered with soil to form a soil filling layer 2, and then a road surface layer 3 is laid above the soil filling layer 2. When the road surface layer 3 is subjected to a load, through the grid-like arranged grid units 411, the vertically downward force is dispersed to the surroundings, and the load on the road surface layer 3 can be effectively dispersed and transmitted, reducing the local bearing pressure of the soil body and further reducing the risk of settlement and deformation.

[0032] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those who are familiar with the field, other modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A subgrade structure for soft foundation soil, comprising a soft base layer (1), a filling soil layer (2) and a road surface layer (3). The filling soil layer (2) is arranged at the upper end of the soft base layer (1), and the road surface layer (3) is arranged at the upper end of the filling soil layer (2). It is characterized in that, The invention also comprises a reinforcement mechanism (4) for reinforcing a soft soil foundation, wherein the reinforcement mechanism (4) is embedded in the fill layer (2), the reinforcement mechanism (4) comprises a geogrid (41) and a perfusion assembly (42), the geogrid (41) is arranged in the fill layer (2), a plurality of groups of perfusion assemblies (42) are arranged through the upper surface of the geogrid (41), the perfusion assembly (42) comprises a perfusion pipe (422) and a cone head (4223), the perfusion pipe (422) is arranged through the fill layer (2), and a plurality of groups of perfusion assemblies (42) are arranged through the upper surface of the geogrid (41). On the working grid (41), the cone head (4223) is fixedly connected to the lower end of the perfusion pipe (422), and the cone head (4223) is inserted into the soft base layer (1). A tube cavity (4221) is opened inside the perfusion pipe (422), and the tube cavity (4221) connects the perfusion pipe (422) and the cone head (4223). A group of grouting holes (4222) are opened on the peripheral side surface at the same height of the perfusion pipe (422), and a group of grouting holes (4222) are provided.

2. The subgrade structure of a soft foundation soil foundation according to claim 1, characterized in that, The geogrid (41) is formed by a plurality of grid units (411) arranged and fixed in a grid shape.

3. The subgrade structure of a soft foundation soil base according to claim 2, characterized in that, A threaded pipe opening (412) is fixedly connected at the connection node of the grid unit (411), and the perfusion pipe (422) is inserted into the threaded pipe opening (412).

4. The roadbed structure of a soft foundation soil base according to claim 3, characterized in that, The perfusion assembly (42) further comprises a threaded connector (421), wherein the threaded connector (421) is fixed to the upper end of the perfusion tube (422).

5. The roadbed structure of a soft foundation soil base according to claim 4, characterized in that, A threaded sleeve (423) is threadedly connected to the circumferential side of the threaded connector (421), and the threaded sleeve (423) is twisted downward to fix the threaded connector (421) and the threaded pipe opening (412).

6. The roadbed structure of a soft foundation soil base according to claim 1, characterized in that, The inner diameter of the lumen (4221) gradually decreases from top to bottom.

7. The subgrade structure of a soft foundation soil base according to claim 6, characterized in that, The grouting holes (4222) are arranged in a plurality of groups along the length direction of the grouting tube (422), and the grouting holes (4222) are in communication with the tube cavity (4221).

8. The subgrade structure of a soft foundation soil subgrade according to claim 1, characterized in that, A cavity (4224) is formed between the open end of the cone head (4223) and the perfusion tube (422).

9. The roadbed structure of a soft foundation soil foundation according to claim 2, characterized in that, The cross section of the grid unit (411) is an I-shape, and the upper and lower surfaces of the grid unit (411) are both friction rough surfaces.

10. The roadbed structure of a soft foundation soil foundation according to claim 4, characterized in that, An expansion flat ring (4211) is fixedly connected to the circumferential side of the upper end of the threaded connector (421).

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