Spiral anchoring grouting foundation pile for soft rock or weathered rock mountainous region
By using coated nanocrystalline nucleus powder in spiral anchored grouting piles, the problem of concrete slump loss at high temperatures was solved, and the stability and strength of concrete in high-temperature environments were improved.
Patent Information
- Application Number
- CN202511834715.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-08
- Publication Date
- 2026-02-24
AI Technical Summary
In the high-temperature environment of summer, the existing spiral anchoring grouting technology suffers severe concrete slump loss, making it difficult to meet construction requirements.
By using coated nanocrystalline core powder, nano-CSH seeds and nano-silica are introduced into concrete as core materials. The shell material physically isolates the particles from the cement paste, slows down the early hydration reaction, and releases nanoparticles under mechanical shear force to form a dense structure.
It significantly reduces the rate of water evaporation in concrete at high temperatures, prolongs the slump retention time, and improves the strength and durability of the foundation piles.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention belongs to the field of foundation pile processing technology, and relates to a spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas. Background Technology
[0002] To adapt to complex mountain construction, the process of simultaneous mechanical rotation drilling and concrete pumping (i.e., spiral anchoring grouting technology) has been applied. It uses rotating blades to press concrete into and squeeze the surrounding rock and soil to form an irregular pile body, which can effectively improve the pile-soil bonding force.
[0003] However, this process has high requirements for the slump of concrete. The slump of concrete is greatly affected by the ambient temperature, especially in the high temperatures of summer. In the high-temperature environment of summer, the water in the concrete slurry evaporates quickly and the cement hydration reaction rate accelerates sharply, resulting in a significant loss of slump in a short period of time, which makes it difficult to meet the construction requirements. Summary of the Invention
[0004] The purpose of this invention is to provide a spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas, thereby solving the above-mentioned problems.
[0005] The technical solution adopted in this invention is as follows: A spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas, wherein the spiral anchored grouting foundation pile is a variable cross-section irregular pile formed by a mechanical rotary drilling and concrete pumping process, the upper part is a straight cylindrical structure, and the lower part is a threaded pile body. The concrete comprises the following components in parts by weight: 62-64 parts silicate cement, 15-16 parts fly ash, 2.5-3.5 parts coated nanocrystalline nucleus powder, 19-20 parts slag powder, 142-145 parts fine aggregate, 204-208 parts coarse aggregate, 1-1.2 parts polycarboxylate superplasticizer, 0.01-0.02 parts air-entraining agent, and 29-31 parts water; The core material of the coated nanocrystalline nucleus powder is nano-CSH seed crystals and nano-silica in a mass ratio of 5:2. The shell material of the coated nanocrystalline nucleus powder is polyvinyl butyral, hydroxypropyl methylcellulose, and sodium citrate in a mass ratio of 3:2:1.
[0006] Furthermore, the coated nanocrystalline core powder is prepared by the following method: nano-CSH seeds and nano-silica are fully dispersed and mixed in a high-speed mixer under inert gas protection to obtain the core material; Polyvinyl butyral, hydroxypropyl methylcellulose and sodium citrate are dissolved in an ethanol-water mixed solvent in a certain proportion to form a coating solution, wherein the coating solution is a shell material; The coating solution is uniformly sprayed onto the surface of the fluidized core material using a fluidized bed granulator. After the solvent evaporates, coated nanocrystalline nuclei powder with a particle size of 20-50 μm is obtained.
[0007] Furthermore, the mass ratio of the core material to the shell material in the coated nanocrystalline nucleus powder is 7:3.
[0008] Furthermore, the fine aggregate is manufactured sand with a fineness modulus of 2.6-2.9 and a mud content of <1%.
[0009] Furthermore, the coarse aggregate is crushed stone, with a continuous gradation of 5-15mm and <5% needle-like and flaky particles.
[0010] Furthermore, the air-entraining agent is a triterpenoid saponin air-entraining agent.
[0011] Furthermore, the silicate cement is P·II52.5R silicate cement.
[0012] Furthermore, the slag powder is S95 grade slag powder.
[0013] The spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas, wherein the concrete is prepared by the following method: S1. Premix the polycarboxylate superplasticizer, air-entraining agent and water evenly to form a composite admixture solution; S2. Premix silicate cement, fly ash, coated nanocrystalline nucleus powder, slag powder, fine aggregate, and coarse aggregate into a mixed dry material; S3. Under stirring, the mixed dry materials are slowly added to the composite admixture solution, and after stirring evenly, concrete with a slump of 180-220mm is obtained.
[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention introduces coated nanocrystalline nucleus powder into the concrete of spiral anchored grouting foundation piles used in soft rock or weathered rock mountainous areas. The shell of the coated nanocrystalline nucleus powder acts immediately after the concrete is mixed, effectively locking in the mixing water by increasing the viscosity of the grout and forming a water-retaining film, slowing down the rate of water evaporation at high temperatures, significantly reducing the slump loss of the concrete, and providing sufficient time for construction. 2. In this invention, the core material of the coated nanocrystalline nucleus powder is nano-CSH seed crystals and nano-silica. During the mixing and pumping stages, they are physically isolated by the shell material and cannot fully contact the cement paste, thus not significantly accelerating the early hydration reaction. When the concrete passes through the pumping pipe, under the action of strong mechanical shear force and compressive stress, the shell material of the coated nanocrystalline nucleus powder cracks. After the shell material cracks, the nano-CSH seed crystals and nano-silica inside are released. The nano-CSH seed crystals and nano-silica work together to form a dense structure in the pile concrete after molding, which can improve the strength and durability of the foundation pile.
[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown herein can generally be arranged and designed in various different configurations.
[0016] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0017] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0018] The features and performance of the present invention will be further described in detail below with reference to embodiments.
[0019] A spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas, wherein the spiral anchored grouting foundation pile is a variable cross-section irregular pile formed by a mechanical rotary drilling and concrete pumping process, the upper part is a straight cylindrical structure, and the lower part is a threaded pile body. The concrete comprises the following components in parts by weight: 62-64 parts silicate cement, 15-16 parts fly ash, 2.5-3.5 parts coated nanocrystalline nucleus powder, 19-20 parts slag powder, 142-145 parts fine aggregate, 204-208 parts coarse aggregate, 1-1.2 parts polycarboxylate superplasticizer, 0.01-0.02 parts air-entraining agent, and 29-31 parts water; The core material of the coated nanocrystalline nucleus powder is nano-CSH seed crystals and nano-silica in a mass ratio of 5:2. The shell material of the coated nanocrystalline nucleus powder is polyvinyl butyral, hydroxypropyl methylcellulose, and sodium citrate in a mass ratio of 3:2:1.
[0020] In the following embodiments, the coated nanocrystalline core powder is prepared by the following method: nano-CSH seeds and nano-silica are fully dispersed and mixed in a high-speed mixer under inert gas protection to obtain the core material; Polyvinyl butyral, hydroxypropyl methylcellulose and sodium citrate are dissolved in an ethanol-water mixed solvent in a certain proportion to form a coating solution, wherein the coating solution is a shell material; The coating solution is uniformly sprayed onto the surface of the fluidized core material using a fluidized bed granulator. After the solvent evaporates, coated nanocrystalline nuclei powder with a particle size of 20-50 μm is obtained.
[0021] In the following embodiments, the mass ratio of the core material to the shell material in the coated nanocrystalline nucleus powder is 7:3.
[0022] In the following embodiments, the fine aggregate is manufactured sand with a fineness modulus of 2.6-2.9 and a mud content of <1%.
[0023] In the following embodiments, the coarse aggregate is crushed stone with a continuous gradation of 5-15mm and <5% needle-like and flaky particles.
[0024] In the following examples, the air-entraining agent is a triterpenoid saponin air-entraining agent.
[0025] In the following examples, the silicate cement is P·II52.5R silicate cement.
[0026] In the following examples, the slag powder is S95 grade slag powder.
[0027] Example 1:
[0028] A preferred embodiment of the present invention provides a spiral anchored grouting foundation pile for use in soft rock or weathered rock mountainous areas. The spiral anchored grouting foundation pile is a variable cross-section irregularly shaped pile formed by a simultaneous mechanical rotary drilling and concrete pumping process. The upper part is a straight cylindrical structure, and the lower part is a threaded pile body. The concrete comprises the following components in parts by weight: 62 parts P·II52.5R silicate cement, 15 parts fly ash, 2.5 parts coated nanocrystalline nucleus powder, and 19 parts S95 grade slag powder. The composition includes 142 parts manufactured sand, 204 parts crushed stone, 1 part polycarboxylate superplasticizer, 0.01 parts triterpenoid saponin air-entraining agent, and 29 parts water; wherein, the core material of the coated nanocrystalline nucleus powder is nano-CSH seed crystals and nano-silica in a mass ratio of 5:2; the shell material of the coated nanocrystalline nucleus powder is polyvinyl butyral, hydroxypropyl methylcellulose, and sodium citrate in a mass ratio of 3:2:1; and the mass ratio of the core material to the shell material in the coated nanocrystalline nucleus powder is 7:3.
[0029] The coated nanocrystalline nucleus powder is prepared by the following method: nano-CSH seeds and nano-silica are fully dispersed and mixed in a high-speed mixer under inert gas protection to obtain a core material; polyvinyl butyral, hydroxypropyl methylcellulose and sodium citrate are dissolved in an ethanol-water mixed solvent in a certain proportion to form a coating liquid, which is the shell material; the coating liquid is uniformly sprayed onto the surface of the fluidized core material through a fluidized bed granulator, and after the solvent evaporates, coated nanocrystalline nucleus powder with a particle size of 20-50 μm is obtained.
[0030] The above-mentioned concrete is prepared by the following method: S1. Premix the polycarboxylate superplasticizer, air-entraining agent and water evenly to form a composite admixture solution; S2. Premix silicate cement, fly ash, coated nanocrystalline nucleus powder, slag powder, fine aggregate, and coarse aggregate into a mixed dry material; S3. Under stirring, the mixed dry materials are slowly added to the composite admixture solution, and after stirring evenly, concrete with a slump of 180-220mm is obtained.
[0031] Example 2 This embodiment differs from Embodiment 1 in that the concrete in this embodiment comprises the following components by weight: 63 parts P·II52.5R silicate cement, 15.5 parts fly ash, 3 parts coated nanocrystalline nucleus powder, 19.5 parts S95 grade slag powder, 143 parts manufactured sand, 206 parts crushed stone, 1.1 parts polycarboxylate superplasticizer, 0.02 parts triterpenoid saponin air-entraining agent, and 30 parts water. All other components are the same.
[0032] Example 3 This embodiment differs from Embodiment 1 in that the concrete in this embodiment comprises the following components by weight: 64 parts P·II52.5R silicate cement, 16 parts fly ash, 3.5 parts coated nanocrystalline nucleus powder, 20 parts S95 grade slag powder, 145 parts manufactured sand, 208 parts crushed stone, 1.2 parts polycarboxylate superplasticizer, 0.02 parts triterpenoid saponin air-entraining agent, and 31 parts water. All other components are the same.
[0033] Comparative Example 1 This comparative example differs from Example 2 in that it does not contain coated nanocrystalline nucleus powder. The concrete in this comparative example comprises the following components by weight: 63 parts P·II52.5R silicate cement, 15.5 parts fly ash, 19.5 parts S95 grade slag powder, 143 parts manufactured sand, 206 parts crushed stone, 1.1 parts polycarboxylate superplasticizer, 0.02 parts triterpenoid saponin air-entraining agent, and 30 parts water. This comparative example concrete was prepared by the following method: S1. Premix the polycarboxylate superplasticizer, air-entraining agent and water evenly to form a composite admixture solution; S2. Premix silicate cement, fly ash, slag powder, fine aggregate, and coarse aggregate into a mixed dry material; S3. Under stirring, the mixed dry materials are slowly added to the composite admixture solution, and after stirring evenly, concrete with a slump of 180-220mm is obtained.
[0034] Comparative Example 2 This comparative example differs from Example 2 in that it directly adds nano-CSH seed crystals and nano-silica without shell coating. The concrete in this comparative example comprises the following components by weight: 63 parts P·II52.5R silicate cement, 15.5 parts fly ash, 3 parts nano-CSH seed crystal / nano-silica mixture, 19.5 parts S95 grade slag powder, 143 parts manufactured sand, 206 parts crushed stone, 1.1 parts polycarboxylate superplasticizer, 0.02 parts triterpenoid saponin air-entraining agent, and 30 parts water. This comparative example concrete is prepared by the following method: S1. Premix the polycarboxylate superplasticizer, air-entraining agent and water evenly to form a composite admixture solution; S2. Premix silicate cement, fly ash, nano-CSH seed crystals / nano-silica mixture, slag powder, fine aggregate, and coarse aggregate into a mixed dry material; S3. Under stirring, the mixed dry materials are slowly added to the composite admixture solution, and after stirring evenly, concrete with a slump of 180-220mm is obtained.
[0035] Comparative Example 3 This comparative example differs from Example 2 in that it directly adds a shell material of coated nanocrystalline nucleus powder without adding a core material. The concrete in this comparative example comprises the following components by weight: 63 parts P·II52.5R silicate cement, 15.5 parts fly ash, 3 parts coating liquid formed by polyvinyl butyral / hydroxypropyl methylcellulose / sodium citrate (prepared according to the method in Example 1), 19.5 parts S95 grade slag powder, 143 parts manufactured sand, 206 parts crushed stone, 1.1 parts polycarboxylate superplasticizer, 0.02 parts triterpenoid saponin air-entraining agent, and 30 parts water. The preparation method is the same as that in Example 1, with adaptive adjustments.
[0036] Experimental Example 1 The slump loss rate of concrete in Examples 1-3 and Comparative Examples 1-3 of the present invention was tested under high temperature conditions of 30℃, 35℃ and 40℃. The results are shown in Table 1.
[0037] The testing method is as follows: Concrete is placed in a sealed, non-absorbent container and placed in a constant temperature chamber that has been pre-set to a set temperature (30℃, 35℃, 40℃) for static standing. At 1 hour (T1), 2 hours (T2), and 3 hours (T3) after the start of static standing, the slump test is completed within 2 minutes according to the "Standard for Test Methods of Performance of Ordinary Concrete Mixtures" (GB / T 50080), and the slump loss rate is calculated; Slump loss rate (%) = [(Initial slump - Slump at a certain moment) / Initial slump] × 100%.
[0038] Table 1 Results of concrete slump loss rate over time.
[0039] In summary, this application can alleviate the slump loss rate in hot summers, and the concrete prepared by this application can adapt to the high-temperature environment in summer.
[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A spiral anchored grouting pile for use in soft rock or weathered rock mountainous areas, wherein the spiral anchored grouting pile is a variable cross-section irregular pile formed by a simultaneous mechanical rotary drilling and concrete pumping process, with a straight cylindrical upper part and a threaded pile body at the bottom, characterized in that: The concrete comprises the following components in parts by weight: 62-64 parts silicate cement, 15-16 parts fly ash, 2.5-3.5 parts coated nanocrystalline nuclei powder, 19-20 parts slag powder, 142-145 parts fine aggregate, 204-208 parts coarse aggregate, 1-1.2 parts polycarboxylate superplasticizer, 0.01-0.02 parts air-entraining agent, and 29-31 parts water; The core material of the coated nanocrystalline nucleus powder is nano-CSH seed crystals and nano-silica in a mass ratio of 5:
2. The shell material of the coated nanocrystalline nucleus powder is polyvinyl butyral, hydroxypropyl methylcellulose, and sodium citrate in a mass ratio of 3:2:
1.
2. The spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas according to claim 1, characterized in that: The coated nanocrystalline core powder is prepared by the following method: nano-CSH seeds and nano-silica are fully dispersed and mixed in a high-speed mixer under inert gas protection to obtain the core material; Polyvinyl butyral, hydroxypropyl methylcellulose and sodium citrate are dissolved in an ethanol-water mixed solvent in a certain proportion to form a coating solution, wherein the coating solution is a shell material; The coating solution is uniformly sprayed onto the surface of the fluidized core material using a fluidized bed granulator. After the solvent evaporates, coated nanocrystalline nuclei powder with a particle size of 20-50 μm is obtained.
3. The spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas according to claim 1, characterized in that: The mass ratio of the core material to the shell material in the coated nanocrystalline nucleus powder is 7:
3.
4. A spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas according to claim 1, characterized in that: The fine aggregate is manufactured sand with a fineness modulus of 2.6-2.9 and a mud content of <1%.
5. A spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas according to claim 1, characterized in that: The coarse aggregate is crushed stone, with a continuous gradation of 5-15mm and less than 5% needle-like and flaky particles.
6. A spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas according to claim 1, characterized in that: The air-entraining agent is a triterpenoid saponin air-entraining agent.
7. A spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas according to claim 1, characterized in that: The silicate cement is P·II52.5R silicate cement.
8. A spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas according to claim 1, characterized in that: The slag powder is S95 grade slag powder.
9. A spiral anchored grouting foundation pile for soft rock or weathered rock mountainous areas according to claim 1, characterized in that: The concrete is prepared by the following method: S1. Premix the polycarboxylate superplasticizer, air-entraining agent and water evenly to form a composite admixture solution; S2. Premix silicate cement, fly ash, coated nanocrystalline nucleus powder, slag powder, fine aggregate, and coarse aggregate into a mixed dry material; S3. Under stirring, the mixed dry materials are slowly added to the composite admixture solution, and after stirring evenly, concrete with a slump of 180-220mm is obtained.