Construction method for vibration isolation screen of all-solid-waste fluid curing porous micropore cast-in-place pile

Abstract

The invention discloses a construction method of an all-solid-waste fluid-state curing porous micropore cast-in-place pile vibration isolation screen, and belongs to the technical field of vibration reduction and isolation of cast-in-place pile vibration isolation screens. According to parts by weight, a micropore cast-in-place pile in the all-solid-waste fluid-state curing porous micropore cast-in-place pile vibration isolation screen is formed by pouring all-solid-waste light foam soil slurry; the all-solid-waste light foam soil slurry is prepared from the following raw materials in parts by weight: 45 to 50 parts of pore-forming spoil, 5 to 10 parts of solid-waste-based curing agent, 4 to 6 parts of foaming agent, 0.15 to 0.2 part of water glass, 0.05 to 1 part of polycarboxylate superplasticizer, 0.05 to 1 part of foam stabilizer and 35 to 40 parts of water. The hole-forming waste residue soil is used for replacing borrowing soil, and the microporous and porous piles and the vibration isolation grooves are combined to replace a traditional vibration isolation wall, so that the vibration isolation wall has the advantages of being good in vibration reduction and isolation effect, low in cost, easy and convenient to construct and the like, and meanwhile has the advantages of saving resources, protecting the environment and the like.

Description

Technical Field

[0001] The present application relates to the technical field of vibration reduction and vibration isolation of cast-in-place pile vibration isolation screens, and in particular to a construction method for a fully solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen. Background Art

[0002] In recent years, with the gradual development of infrastructure projects, the depth of underground tunnels has also gradually increased. There are a large number of rock formations within the scope of tunnel excavation. Due to the difficulty of mechanical excavation of rock formations and low excavation efficiency, it is difficult to ensure construction costs and progress. Rock excavation is mostly carried out by blasting. Although the blasting construction technology for rocks is relatively mature, the surrounding environment of blasting construction is complex and the construction site is getting closer and closer to sensitive structures, and the restrictions on vibration are getting higher and higher. Therefore, during the tunnel blasting excavation process, it is necessary to avoid or minimize the impact on the surrounding existing structures and residents' lives.

[0003] Existing vibration isolation measures mostly adopt empty trenches and filled trenches. However, due to the limitations of construction technology, groundwater often seeps into the ditch from the empty trench, resulting in a weakening of the vibration isolation effect. The actual construction of the filled trench has the disadvantages of large engineering volume and high material consumption. For example, a trench can be dug in the main protection direction or a broken zone can be artificially created to reduce vibration. This method is costly and will have a certain negative impact on the surrounding environment. Application No. CN201010155977.2 discloses a geogrid reinforced gravel vibration isolation device and a preparation method thereof. This method reduces vibration output by arranging a vibration isolation layer and an isolation layer from top to bottom. The vibration isolation layer is composed of a lower geotextile layer, an alternately laid graded gravel layer and a geogrid, and an upper geotextile layer from bottom to top, and the isolation layer is located above the vibration isolation layer. This method is suitable for eliminating vibration from the ground from top to bottom, but is not suitable for horizontal vibration reduction and isolation (such as blasting), and has the problems of large construction volume and complex construction operation; Application No. CN201520158080.3 discloses a polyurethane rigid foam continuous vibration isolation barrier method with anchor rod constraints. This method achieves soil vibration attenuation caused by rail transit by arranging a polyurethane rigid foam continuous barrier between the vibration source and the building, thereby reducing the vibration of buildings or structures caused by rail transit. However, this method also has the problems of high cost, good vibration isolation effect for low-frequency vibration, and limited vibration isolation effect for medium and high frequencies. Summary of the invention

[0004] The purpose of this application is to provide a construction method for a full-solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen. During the construction process of this method, according to relevant specifications and building safety requirements, the vibration isolation screen should be set outside the safe range of the building to ensure the vibration attenuation effect and the structural safety of the building. The specific distance should be determined according to the actual situation of the project, the design requirements of the vibration isolation screen, the frequency of the vibration source and the local building specifications. At the site where the vibration isolation screen is set up, a long spiral impact hole is first used, and then the hole-forming waste soil is mixed and stirred with solid waste-based curing agent, foaming agent, foam stabilizer, water and other raw materials in a certain proportion to form a full-solid waste lightweight foam slurry, and then the full-solid waste lightweight foam slurry is backfilled into the pile hole, and finally a cast-in-place pile vibration isolation screen with vibration reduction and isolation effect is formed after maintenance. The solidification material of all-solid waste fluidized solidification porous micro-porous piles adopts solid waste-based gels such as slag, fly ash, and carbide slag, and porous waste soil. It effectively realizes resource recycling while ensuring strength, and solves the problems of high cost and environmental unfriendliness of traditional methods. At the same time, it also has the characteristics of simple construction, low cost, and good vibration reduction and isolation performance.

[0005] The present application provides a construction method for a full-solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen. Calculated by weight, the microporous cast-in-place piles in the full-solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen are cast by full-solid waste lightweight foam slurry. The raw materials of the full-solid waste lightweight foam slurry include 45-50 parts by weight of pore-forming waste soil, 5-10 parts by weight of a solid waste-based curing agent, 4-6 parts by weight of a foaming agent, 0.15-0.2 parts by weight of water glass, 0.05-1 parts by weight of a polycarboxylic acid water reducer, 0.05-1 parts by weight of a foam stabilizer, and 35-40 parts by weight of water.

[0006] Preferably, in parts by weight, the solid waste-based curing agent includes 35-50 parts of slag, 35-45 parts of fly ash, 1-15 parts of carbide slag, 4-8 parts of desulfurized gypsum, 0.2-1 parts of polyether polyurethane, 1-10 parts of sugar residue, and 1.5-5 parts of aluminum sulfate type liquid accelerating agent.

[0007] Preferably, in the raw materials of the all-solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen, the foaming agent is a composite foaming agent, the foam stabilizer is anionic sodium dodecyl sulfate K12, pH 7.5-9.5, and the active matter content is more than 32%.

[0008] Preferably, the particle size of the pore-forming waste soil is less than 5 mm.

[0009] Preferably, the construction method comprises the following steps:

[0010] S1, excavation of vibration isolation groove;

[0011] S2, clear and level the bottom of the vibration isolation trough where the vibration isolation screen is required, and select and lay out the predetermined pile positions;

[0012] S3, excavating and moving soil at the predetermined pile position to obtain a hole;

[0013] S4, screening the excavated borehole spoil to obtain borehole spoil with a particle size less than 5 mm;

[0014] S5, mixing the pore-forming spoil with a particle size of less than 5 mm, the solid waste-based curing agent and water for a stirring time of not less than 90-120 seconds to obtain slurry 1;

[0015] S6, adding a polycarboxylate water-reducing agent to the slurry 1 obtained in step 5 and stirring them thoroughly to obtain a slurry 2; then diluting the foaming agent, adding a foam stabilizer to the diluted foaming agent to obtain a foaming agent-stabilizer mixed solution, and then adding the obtained foaming agent-stabilizer mixed solution to the slurry 2 stirred in step 6, and adding water glass to the obtained foamed soil slurry to obtain a fully solid waste lightweight foamed soil slurry;

[0016] S7, injecting the all-solid waste lightweight foam slurry obtained in step 6 into the pile hole, and curing at room temperature to obtain the all-solid waste fluidized solidified porous micro-porous pile vibration isolation screen.

[0017] Preferably, the hole-forming method is long spiral hole-forming or artificial hole-forming.

[0018] Preferably, the cross-section of the all-solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen is trapezoidal, rectangular, or V-shaped.

[0019] Therefore, this application adopts the above-mentioned all-solid waste fluidized solidification porous microporous cast-in-place pile vibration isolation screen construction method, which has the following beneficial effects:

[0020] (1) The all-solid waste lightweight foamed soil slurry is prepared by using industrial solid waste-based gel and porous waste soil, which realizes the comprehensive recycling of industrial engineering solid waste and does not use cement, indirectly reducing carbon emissions. It can be used not only for lightweight soil piles, but also for filling other spaces that do not have mechanical construction operations;

[0021] (2) Using all-solid waste lightweight foam slurry to form all-solid waste fluidized solidified porous micro-porous piles and cooperating with vibration isolation troughs to form vibration isolation screens, which can effectively eliminate horizontal vibration transmission (such as blasting);

[0022] (3) The all-solid waste lightweight foam slurry has the characteristics of high viscosity and rapid strength formation, which can effectively achieve foaming and overcome the defoaming problem during the construction process.

[0023] (4) Bored waste soil is used to replace borrowed soil, and microporous piles combined with vibration isolation grooves are used to replace traditional vibration isolation walls. This has the advantages of good vibration reduction and isolation effect, low cost, and simple construction. It also has the characteristics of saving resources and protecting the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the construction process diagram of the full solid waste flow solidification porous micro-hole pile vibration isolation screen;

[0025] Figure 2 It is a schematic diagram of the structure of the seismic isolation trough;

[0026] Figure 3 It is a schematic diagram of the structure of excavating a hole;

[0027] Figure 4 Structural diagram for maintaining piles. DETAILED DESCRIPTION

[0028] Example 1

[0029] The ratio of the solid waste-based curing agent is Ratio A in Table 1. In Ratio A, the content of slag is 42.5 parts, the content of fly ash is 35 parts, the content of carbide slag is 10 parts, the content of desulfurized gypsum is 5 parts, the content of polyether polyurethane is 0.5 parts, the content of sugar residue is 5 parts, and the content of aluminum sulfate type liquid quick-setting agent is 2 parts.

[0030] A method for constructing a vibration isolation screen of porous microporous cast-in-place piles solidified by full solid waste flow state comprises the following steps:

[0031] (1) Excavate the vibration isolation groove: Use an excavator to excavate the earthwork outside a certain range from the building structure. The cross-sectional shape of the vibration isolation groove is not limited to trapezoidal, rectangular, V-shaped, etc., and the size is determined according to the specific site;

[0032] (2) Clear and level the bottom of the vibration isolation trough where the vibration isolation screen is required;

[0033] (3) Construction design: The pile diameter is 0.2m, the hole center distance is 1m, the pile length is 1-5m, a row of piles is designed, and the pile positions are selected and laid out;

[0034] (4) Control the long spiral drill bit to dig holes and move soil at the predetermined pile position. The hole depth (i.e., pile length) is 3m. The long spiral drilling method should be determined according to the on-site working conditions. If the bottom width of the vibration isolation groove is small, the bite method can be used to form a continuous wall. Otherwise, the non-bite method can be selected to form two to three rows of holes.

[0035] (5) screening the excavated pore-forming spoil to obtain pore-forming spoil with a particle size of less than 5 mm;

[0036] (6) 45 wt.% of the pore-forming waste soil, 10 wt.% of the solid waste-based curing agent, and 38 wt.% of water were mixed and stirred for 2 minutes to prepare a slurry 1; the particle size of the pore-forming waste soil was less than 5 mm.

[0037] (7) Add 0.3wt.% polycarboxylic acid water reducer, 6wt.% foaming agent, and 0.5wt.% foam stabilizer to slurry 1, stir thoroughly, and then add 0.2wt.% water glass to prepare a fully solid waste lightweight foamed soil slurry; the foaming agent is a composite foaming agent, the foam stabilizer is anionic sodium dodecyl sulfate K12, pH 7.5-9.5, and the active matter content is more than 32%.

[0038] (8) slowly injecting the all-solid waste lightweight foam slurry obtained in step (7) into the pile hole and curing;

[0039] (9) Clean the excess soil on the top and around the pile to finally form the pile.

[0040] Example 2

[0041] The ratio of the solid waste-based curing agent is ratio B in Table 1. In ratio B, the content of slag is 39.8 parts, the content of fly ash is 40 parts, the content of carbide slag is 5 parts, the content of desulfurized gypsum is 8 parts, the content of polyether polyurethane is 0.2, the content of sugar residue is 6 parts, and the content of aluminum sulfate type liquid quick-setting agent is 2 parts.

[0042] The construction method of a fully solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen is the same as that in Example 1. The performance of the obtained vibration isolation screen is shown in Table 1

[0043] Example 3

[0044] The ratio of the solid waste-based curing agent is the ratio C in Table 1. In the ratio C, the content of slag is 43 parts, the content of fly ash is 40 parts, the content of carbide slag is 8 parts, the content of desulfurized gypsum is 4 parts, the content of polyether polyurethane is 1 part, the content of sugar residue is 3 parts, and the content of aluminum sulfate type liquid accelerating agent is 1 part.

[0045] The construction method of a fully solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen is the same as that in Example 1. The performance of the obtained vibration isolation screen is shown in Table 1

[0046] Example 4

[0047] The ratio of the solid waste-based curing agent is the ratio D in Table 1. In the ratio D, the content of slag is 49.2 parts, the content of fly ash is 35 parts, the content of carbide slag is 6 parts, the content of desulfurized gypsum is 4 parts, the content of polyether polyurethane is 0.3 parts, the content of sugar residue is 4 parts, and the content of aluminum sulfate type liquid accelerating agent is 1.5 parts.

[0048] The construction method of a full-solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen is the same as that in Example 1, and the performance of the obtained vibration isolation screen is shown in Table 1.

[0049] The density, strength, elastic modulus and vibration isolation effect of the vibration isolation screens obtained in Examples 1-4 were measured and compared. The data are shown in Table 1.

[0050] Table 1. Results of all-solid waste lightweight foamed soil slurry obtained with different proportions

[0051]

[0052] From the results, we can see that the density of mix D is the lowest (750kg / m 3 ), showing that a combination of a higher proportion of slag, sugar slag and an appropriate amount of accelerator is more conducive to reducing density. Mix D has the highest strength (3.8MPa), indicating that the combination of slag and fly ash improves the structural strength of the slurry. Mix D has the highest elastic modulus (420MPa), which means that it has a strong ability to resist deformation and is more suitable for scenes with high requirements for vibration isolation. Mix D has the best vibration isolation effect (<35dB), indicating that this mix has the best performance in vibration reduction.

[0053] Comparative Example 1

[0054] A comparative experiment was conducted using traditional cement-based foamed soil slurry material. The density, elastic modulus, and vibration isolation performance of the vibration isolation screen obtained in Example 4 and the vibration isolation screen obtained in Comparative Example 1 are shown in Table 2.

[0055] Table 2 Comparison of the performance of the vibration isolation screens of Comparative Example 1 and Example 4

[0056]

[0057] Density: The density of all-solid waste lightweight foam slurry is 800kg / m 3 , 20% lower than traditional cement-based foam slurry, which means lighter weight at the same volume, more conducive to construction and reduced material usage

[0058] Elastic modulus: The elastic modulus of the all-solid waste lightweight foam soil slurry is 420MPa, which is lower than the 600MPa of cement-based materials, which gives it better flexibility and shock absorption properties.

[0059] Vibration isolation effect: The vibration isolation effect of all-solid waste materials reaches <35dB, which is significantly improved compared to the <25dB of cement-based materials, demonstrating its superior vibration attenuation ability.

[0060] Compared with traditional vibration isolation screens, the full solid waste fluidized solidified porous micro-pile vibration isolation screen adopts the synergistic effect of vibration isolation grooves and micro-porous cast-in-place piles. The micro-porous cast-in-place piles form a porous vibration isolation layer in the vibration isolation groove, which makes the vibration wave continuously attenuate during the propagation process, thereby significantly reducing the impact on the surrounding environment. In addition, the combination of microporous structure and vibration isolation groove can effectively absorb and disperse horizontal vibrations, especially when dealing with medium and low frequency vibration sources such as tunnel blasting and construction machinery vibration. It has excellent vibration isolation performance.

[0061] Therefore, the present application provides a construction method for a fully solid waste fluid-solidified porous microporous cast-in-place pile vibration isolation screen. When the vibration wave is transmitted, it is absorbed and reduced by the porous micropores on the cast-in-place pile, and works together with the vibration isolation groove to achieve vibration isolation. It has the advantages of good vibration reduction and isolation effect, low cost, and simple construction.

[0062] In the description of this specification, the description with reference to the terms "an experimental example", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the experimental example or example are included in at least one experimental example or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same experimental example or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more experimental examples or examples in a suitable manner.

[0063] Finally, it should be noted that the above experimental examples are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred experimental examples, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A construction method for a full solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen, characterized in that: According to the weight percentage, the microporous cast-in-place piles in the all-solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen are cast by all-solid waste lightweight foam slurry. The raw materials of the all-solid waste lightweight foam slurry include 45-50 weight percentages of pore-forming spoil, 5-10 weight percentages of solid waste-based curing agent, 4-6 weight percentages of foaming agent, 0.15-0.2 weight percentages of water glass, 0.05-1 parts by weight of polycarboxylic acid water reducer, 0.05-1 parts by weight of foam stabilizer, 35-40 parts by weight of water.

2. The method for constructing a vibration isolation screen of porous microporous cast-in-place piles solidified by full solid waste fluidization according to claim 1 is characterized in that: Calculated by weight, the solid waste-based curing agent includes 35-50 parts of slag, 35-45 parts of fly ash, 1-15 parts of carbide slag, 4-8 parts of desulfurized gypsum, 0.2-1 parts of polyether polyurethane, 1-10 parts of sugar residue, and 1.5-5 parts of aluminum sulfate type liquid accelerating agent.

3. The method for constructing a vibration isolation screen of porous microporous cast-in-place piles solidified by full solid waste fluidization according to claim 1 is characterized in that: Among the raw materials of the all-solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen, the foaming agent is a composite foaming agent, the foam stabilizer is anionic sodium dodecyl sulfate K12, pH 7.5-9.5, and the active matter content is more than 32%.

4. The method for constructing a vibration isolation screen of porous microporous cast-in-place piles solidified by full solid waste fluidization according to claim 1 is characterized in that: The particle size of the spoil from the holes is less than 5mm.

5. The method for constructing a vibration isolation screen of a porous microporous cast-in-place pile solidified by fluidized solidification of all solid waste according to any one of claims 1 to 4, characterized in that: The construction method includes the following steps: S1, excavation of vibration isolation groove; S2, clear and level the bottom of the vibration isolation trough where the vibration isolation screen is required, and select and lay out the predetermined pile positions; S3, excavating and moving soil at the predetermined pile position to obtain a hole; S4, screening the excavated borehole spoil to obtain borehole spoil with a particle size less than 5 mm; S5, preliminarily stirring the pore-forming spoil with a particle size of less than 5 mm, the solid waste-based curing agent and water for a stirring time of not less than 90-120 seconds to obtain slurry 1; S6, adding a polycarboxylate water-reducing agent to the slurry 1 obtained in step 5 and stirring them thoroughly to obtain a slurry 2; then diluting the foaming agent, adding a foam stabilizer to the diluted foaming agent to obtain a foaming agent-stabilizer mixed solution, and then adding the obtained foaming agent-stabilizer mixed solution to the slurry 2 stirred in step 6, and adding water glass to the obtained foamed soil slurry to obtain a fully solid waste lightweight foamed soil slurry; S7, injecting the all-solid waste lightweight foam slurry obtained in step 6 into the pile hole, and curing at room temperature to obtain the all-solid waste fluidized solidified porous micro-porous pile vibration isolation screen.

6. The method for constructing a vibration isolation screen of porous microporous cast-in-place piles solidified by full solid waste fluidization according to claim 5 is characterized in that: The hole diameter is 0.1-0.3m, the hole center distance is 0.8-1.2m, and the pile length is 1-5m.

7. The method for constructing a vibration isolation screen of porous microporous cast-in-place piles solidified by full solid waste fluidization according to claim 5 is characterized in that: The hole-forming methods include long spiral hole-forming and artificial hole-forming.

8. The method for constructing a vibration isolation screen of porous microporous cast-in-place piles solidified by full solid waste fluidization according to claim 5 is characterized in that: The cross-section of the all-solid waste fluidized solidified porous microporous cast-in-place pile vibration isolation screen is trapezoidal, rectangular, or V-shaped.

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