Pile body for improving humidity environment in roadbed

Abstract

The invention discloses a pile body for improving the humidity environment in a roadbed, and the pile body sequentially comprises a moisture absorption pile body with the length of 5-8m and the pore-forming diameter of 0.2-0.4 m from bottom to top, a water absorption pile body with the pore-forming diameter of 0.2-0.4 m and a water absorption pile body with the pore-forming diameter of 0.2-0.4 m; the length of the early strength type concrete pile body is 0.9-1.2 m, and the pore-forming diameter is 0.2-0.4 m; the synchronous broken stone sealing layer is prepared from the following raw materials: SBS (Styrene Butadiene Styrene) modified asphalt and limestone with a single particle size of 4.75 to 9.5 mm; the thickness of the asphalt mixture upper surface layer is the same as that of the original pavement, and the raw materials of the asphalt mixture upper surface layer comprise dense SBS modified asphalt mixture. According to the technical scheme provided by the invention, the technology and the material which are trenchless, short in traffic interruption time, capable of remarkably improving the humidity environment in the roadbed and capable of increasing the overall strength of the roadbed are provided for solving the problems that the moisture content of the roadbed is too high, water cannot be effectively discharged, the instability risk occurs, or the roadbed is not uniformly deformed and cracked; and roadbed disaster risks in special climate and geological environments can be reduced or eliminated.

Description

Technical Field

[0001] The invention relates to the field of highway roadbed maintenance, in particular to a pile body for improving the internal humidity environment of the roadbed. Background Art

[0002] With the decline of the national highway construction boom, highway maintenance has gradually become the focus of attention of engineering and technical personnel. Since early highway construction passed through special soil areas, the subgrade treatment design was not considered enough, and the subgrade drainage facilities were not effective. Subgrade diseases often occur frequently due to excessive changes in the moisture content inside the subgrade and excessively high moisture content, which leads to aggravated pavement structure diseases and a serious reduction in driving comfort. In addition, due to the frequent occurrence of extreme weather such as continuous rainfall in recent years, the subgrade soil has too high moisture content and poor drainage, resulting in subgrade instability. In parts of the country such as Guangdong, serious casualties caused by subgrade instability due to continuous rainfall have occurred. At present, the highway subgrade maintenance industry is very short of effective stabilization and reinforcement maintenance of the subgrade without long-term traffic interruption.

[0003] Therefore, a pile body that can improve the internal humidity environment of the roadbed is needed. Summary of the invention

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A pile body for improving the humidity environment inside a roadbed, the pile body comprising, from bottom to top:

[0006] Hygroscopic pile body, length is 5-8m, hole diameter is 0.2-0.4m;

[0007] Early strength concrete pile, length 0.9 ~ 1.2m, hole diameter 0.2 ~ 0.4m;

[0008] Synchronous chipped stone seal, the raw materials of synchronous chipped stone seal include: SBS modified asphalt and 4.75-9.5mm single particle size limestone;

[0009] The thickness of the asphalt mixture upper layer is the same as the original road surface thickness. The raw materials of the asphalt mixture upper layer include: densely mixed SBS modified asphalt mixture.

[0010] Furthermore, the raw materials of the moisture-absorbing pile body include: 15-25 parts of coarse sand, 20-30 parts of PO42.5 ordinary Portland cement, 35-45 parts of quicklime powder, 10-20 parts of slaked lime powder, 10-20 parts of calcium chloride, and 0.2-0.8 parts of SAP water-absorbing resin.

[0011] Furthermore, the water-cement ratio of the early-strength concrete pile is 0.35 to 0.4.

[0012] Furthermore, the hole spacing of the hygroscopic pile body and the early-strength concrete pile body is 0.5-2.5m.

[0013] The construction method of the pile body for improving the internal humidity environment of the roadbed includes the following steps:

[0014] (1) Determine the pile hole depth; when the roadbed fill is 2 meters, the pile hole depth is determined to be 6 meters based on the effective depth of the roadbed load;

[0015] (2) Determine the spacing of the pile holes. According to the determined composition ratio of the hygroscopic pile body material, the measured moisture content of the roadbed soil is determined in combination with indoor simulation tests. That is, by reducing the moisture content of the roadbed soil by 5 times, the indoor simulation test determines that the moisture content of the roadbed soil is reduced to 1.2 times the optimal moisture content; the determined influence radius R is 0.6 meters, and the final spacing of the control piles is determined to be 1.2 meters;

[0016] (3) After the pavement is bored, the hygroscopic pile body is filled. The raw materials of the hygroscopic pile body are poured into the hole by high-pressure powder filling equipment and compacted layer by layer. Sprinkling a small amount of water during layer compaction helps compact the powder body. The pile body is filled to the bottom of the pavement cushion layer.

[0017] (4) After the hygroscopic pile body is filled, the raw materials of the early-strength concrete pile body are mixed and filled into the early-strength pile body, and the pile body is filled to the road surface and vibrated and compacted;

[0018] (5) After the early-strength pile body is formed, the upper layer of the original road surface is milled;

[0019] (6) After milling, synchronous crushed stone seal is constructed. The SBS modified hot asphalt spreading rate of the synchronous crushed stone seal is 1.6 kg / ㎡, and the crushed stone is 7.2-9.5 mm limestone with a spreading rate of 7 kg / ㎡;

[0020] (7) After the synchronous gravel construction is completed, the asphalt mixture top layer is re-paved using densely mixed SBS modified asphalt mixture.

[0021] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0022] The technical solution proposed in the present invention aims at the situation where the moisture content of the roadbed is too high, the water cannot be effectively discharged, the risk of instability occurs, or the roadbed has uneven deformation and cracking diseases. It provides a non-excavation process and material with short traffic interruption time, which can significantly improve the internal humidity environment of the roadbed and increase the overall strength of the roadbed, so as to reduce or eliminate the risk of roadbed disasters in special climatic and geological environments.

[0023] The technical solution provided by the patent of this invention has the characteristic of micro-expansion of the pile body after absorbing moisture, which can provide lateral stress for the roadbed soil, thereby improving the vertical shear resistance of the roadbed soil, thereby helping to avoid lateral sliding and collapse of the roadbed and uneven settlement.

[0024] The technical solution provided by the patent of the present invention is that the pile body can form strength by itself after absorbing moisture, which helps to improve the bearing capacity of the roadbed and increase the service life of the roadbed.

[0025] The technical solution provided by the patent of this invention is of great significance to improving the technical quality of pavement maintenance engineering and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 Schematic diagram of the structure of the pile body for improving the internal humidity environment of the roadbed;

[0028] Description of main component symbols:

[0029] Asphalt mixture top layer 1 Synchronous Chip Seal 2 Early strength concrete pile 3 Hygroscopic pile 4

[0030] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0031] The following embodiments may help those skilled in the art to more fully understand the present invention, but shall not limit the present invention in any way.

[0032] Example

[0033] A pile body for improving the humidity environment inside a roadbed, the pile body comprising, from bottom to top:

[0034] The moisture absorbing pile body 4 has a length of 5 to 8 m and a hole diameter of 0.2 to 0.4 m;

[0035] Early strength concrete pile body 3, length 0.9-1.2m, hole diameter 0.2-0.4m;

[0036] Synchronous chipped stone seal 2, the raw materials of synchronous chipped stone seal include: SBS modified asphalt and 4.75-9.5mm single particle size limestone;

[0037] The asphalt mixture upper layer 1 has a thickness that is the same as the original road surface thickness. The raw materials of the asphalt mixture upper layer include: densely mixed SBS modified asphalt mixture.

[0038] In one embodiment of the present invention, the raw materials of the hygroscopic pile body include: 15-25 parts of coarse sand, 20-30 parts of PO42.5 ordinary Portland cement, 35-45 parts of quicklime powder, 10-20 parts of slaked lime powder, 10-20 parts of calcium chloride, and 0.2-0.8 parts of SAP water-absorbing resin.

[0039] In one embodiment of the present invention, the raw materials of the early-strength concrete pile body include: 55-65 parts of 5-10 mm limestone crushed stone, 20-30 parts of medium sand, 0.4-0.6 parts of boric acid, 0.2-0.3 parts of polycarboxylate water reducer, and 15-25 parts of 42.5 sulphoaluminate cement.

[0040] Furthermore, the water-cement ratio of the early-strength concrete pile is 0.35 to 0.4.

[0041] In one embodiment of the present invention, the spacing of holes of the hygroscopic pile body and the early-strength concrete pile body is 0.5-2.5m.

[0042] Example 1

[0043] A pile body for improving the humidity environment inside a roadbed, the pile body is composed of the following components from the road surface upwards:

[0044] Hygroscopic pile body, length is 5-8m, hole diameter is 0.2-0.4m;

[0045] Early strength concrete pile, length 0.9 ~ 1.2m, hole diameter 0.2 ~ 0.4m;

[0046] Synchronous chipped stone seal, the raw materials of synchronous chipped stone seal include: SBS modified asphalt and 4.75-9.5mm single particle size limestone; Synchronous chipped stone seal is a mixture of SBS modified asphalt and 4.75-9.5mm single particle size limestone.

[0047] The thickness of the asphalt mixture upper layer is the same as the original road surface thickness. The raw materials of the asphalt mixture upper layer include: densely mixed SBS modified asphalt mixture.

[0048] In one embodiment of the present invention, the raw materials of the hygroscopic pile body include: 15 parts of coarse sand, 20 parts of PO42.5 ordinary Portland cement, 35 parts of quicklime powder, 15 parts of slaked lime powder, 15 parts of calcium chloride, 0.3 parts of SAP water-absorbing resin, and the water-cement ratio is 0.35. The hygroscopic pile body is mixed with the above raw materials.

[0049] In one embodiment of the present invention, the raw materials of the early strength concrete pile body include: 60 parts of 5-10 mm limestone crushed stone, 20 parts of medium sand, 0.4 parts of boric acid, 0.2 parts of polycarboxylate water reducer, and 20 parts of 42.5 sulphoaluminate cement. The early strength concrete pile body is mixed with the above raw materials.

[0050] In one embodiment of the present invention, the spacing of holes of the hygroscopic pile body and the early-strength concrete pile body is 0.5-2.5m.

[0051] The construction method of the pile body for improving the internal humidity environment of the roadbed includes the following steps:

[0052] (1) Determine the pile hole depth; when the roadbed fill is 2 meters, the pile hole depth is determined to be 6 meters based on the effective depth of the roadbed load;

[0053] (2) Determine the spacing of the pile holes. According to the determined composition ratio of the hygroscopic pile body material, the measured moisture content of the roadbed soil is determined in combination with indoor simulation tests. That is, by reducing the moisture content of the roadbed soil by 5 times, the indoor simulation test determines that the moisture content of the roadbed soil is reduced to 1.2 times the optimal moisture content; the determined influence radius R is 0.6 meters, and the final spacing of the control piles is determined to be 1.2 meters;

[0054] (3) After the pavement is bored, the hygroscopic pile body is filled. The raw materials of the hygroscopic pile body are poured into the hole by high-pressure powder filling equipment and compacted layer by layer. Sprinkling a small amount of water during layer compaction helps compact the powder body. The pile body is filled to the bottom of the pavement cushion layer.

[0055] (4) After the hygroscopic pile body is filled, the raw materials of the early-strength concrete pile body are mixed and filled into the early-strength pile body, and the pile body is filled to the road surface and vibrated and compacted;

[0056] (5) After the early-strength pile body is formed, the upper layer of the original road surface is milled;

[0057] (6) After milling, synchronous crushed stone seal is constructed. The SBS modified hot asphalt spreading rate of the synchronous crushed stone seal is 1.6 kg / ㎡, and the crushed stone is 7.2-9.5 mm limestone with a spreading rate of 7 kg / ㎡;

[0058] (7) After the synchronous gravel construction is completed, the asphalt mixture top layer is re-paved using densely mixed SBS modified asphalt mixture.

[0059] The performance of the embodiment of the present invention was tested, and the results are shown in the following table:

[0060] Table 1: Measured indicators 3 months after the implementation of the test section (sensors buried 1 meter away from the pile)

[0061] Example Roadbed soil moisture Inclinometer tilt deformation (mm) This example roadbed section 88.5 2.1 No implementation of roadbed section 67.2 0.4

[0062] Table 2: Test indicators of hygroscopic pile materials after being placed in a 90% humidity curing room for 28 days

[0063]

[0064] Note: The value is for compacted 10cm×10cm blocks. The water absorption is measured by dividing the mass difference before and after the test by the volume.

[0065] To sum up, compared with the existing technology, compared with large-scale replacement of roadbed soil or implementation of large-scale retaining reinforcement, this technology and process has the least impact on traffic interruption, the smallest project volume, the lowest project cost, minimizes economic losses to the greatest extent, and facilitates people's travel.

[0066] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A pile body for improving the humidity environment inside the roadbed, characterized in that: The pile body is composed of: Hygroscopic pile body, length is 5-8m, hole diameter is 0.2-0.4m; Early strength concrete pile, length 0.9~1.2m, hole diameter 0.2~0.4m; Synchronous chipped stone seal, the raw materials of synchronous chipped stone seal include: SBS modified asphalt and 4.75-9.5mm single particle size limestone; The thickness of the asphalt mixture upper layer is the same as the original road surface thickness. The raw materials of the asphalt mixture upper layer include: densely mixed SBS modified asphalt mixture.

2. The pile body for improving the internal humidity environment of the roadbed according to claim 1, characterized in that: The raw materials of the early strength concrete pile body include: 55-65 parts of 5-10 mm limestone crushed stone, 20-30 parts of medium sand, 0.4-0.6 parts of boric acid, 0.2-0.3 parts of polycarboxylate water reducer, and 15-25 parts of 42.5 sulphoaluminate cement.

3. The pile body for improving the internal humidity environment of the roadbed according to claim 1, characterized in that: The raw materials of the moisture-absorbing pile body include: 15-25 parts of coarse sand, 20-30 parts of PO42.5 ordinary Portland cement, 35-45 parts of quicklime powder, 10-20 parts of slaked lime powder, 10-20 parts of calcium chloride, and 0.2-0.8 parts of SAP water-absorbing resin.

4. The pile body for improving the internal humidity environment of the roadbed as claimed in claim 2, characterized in that: The water-cement ratio of the early-strength concrete pile is 0.35-0.

4.

5. The pile body for improving the internal humidity environment of the roadbed as claimed in claim 1, characterized in that: The hole spacing of the moisture-absorbing pile body is 0.5-2.5m.

6. The pile body for improving the internal humidity environment of the roadbed as claimed in claim 3, characterized in that: The raw materials of the moisture-absorbing pile body include: 15 parts of coarse sand, 20 parts of PO42.5 ordinary Portland cement, 35 parts of quicklime powder, 15 parts of slaked lime powder, 15 parts of calcium chloride, 0.3 parts of SAP water-absorbing resin, and the water-cement ratio is 0.

35.

7. The pile body for improving the internal humidity environment of the roadbed as claimed in claim 2, characterized in that: The raw materials of the early strength concrete pile body include: 60 parts of 5-10 mm limestone crushed stone, 20 parts of medium sand, 0.4 parts of boric acid, 0.2 parts of polycarboxylate water reducer, and 20 parts of 42.5 sulphoaluminate cement.

8. The pile body for improving the internal humidity environment of a roadbed according to any one of claims 1 to 7, characterized in that: The construction method of the pile body for improving the internal humidity environment of the roadbed includes the following steps: (1) Determine the pile hole depth; (2) Determine the spacing between pile holes; (3) After the pavement is bored, the hygroscopic pile body is filled. The raw materials of the hygroscopic pile body are poured into the hole by high-pressure powder filling equipment and compacted layer by layer. Sprinkling a small amount of water during layer compaction helps compact the powder body. The pile body is filled to the bottom of the pavement cushion layer. (4) After the hygroscopic pile body is filled, the raw materials of the early-strength concrete pile body are mixed and filled into the early-strength pile body, and the pile body is filled to the road surface and vibrated and compacted; (5) After the early-strength pile body is formed, the upper layer of the original road surface is milled; (6) After milling, synchronous crushed stone seal construction is carried out; (7) After the synchronous gravel construction is completed, the asphalt mixture top layer is re-paved using densely mixed SBS modified asphalt mixture.

9. The pile body for improving the internal humidity environment of the roadbed as claimed in claim 8, characterized in that: The spreading amount of SBS modified hot asphalt for synchronous chip seal is 1.6kg / ㎡, and the spreading amount of chip seal is 7Kg / ㎡.

10. The pile body for improving the internal humidity environment of the roadbed as claimed in claim 8, characterized in that: The pile drilling depth is 6m; the pile spacing is 1.2m.

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