High-strength light-weight composite sounding pipe and preparation method thereof

Abstract

The application relates to the technical field of sounding pipes, and discloses a high-strength light composite sounding pipe and a preparation method thereof. The high-strength light composite sounding pipe comprises, from inside to outside, a galvanized steel corrugated pipe, a mortar layer and a steel pipe. The raw materials of the mortar layer comprise the following components in mass parts: cement 25-35 parts, sand 20-30 parts, fly ash 15-25 parts, mineral powder 1.5-2.5 parts, silica fume 0.5-1.5 parts, redispersible latex powder 1.5-2.5 parts, 4-amino-3-sulfo-1,8-naphthalene anhydride modified fiber 5-10 parts, cellulose 0.1-0.2 parts, water reducing agent 0.1-0.3 parts and water 15-25 parts. Through the technical scheme, the problem that the fiber in the prior art is unevenly dispersed in the mortar and is prone to be aggregated into balls is solved.

Description

Technical Field

[0001] This invention relates to the field of acoustic logging pipe technology, specifically to a high-strength lightweight composite acoustic logging pipe and its preparation method. Background Technology

[0002] The ultrasonic testing tube (abbreviated as ultrasonic tube) is the channel through which the transducer enters the pile body during ultrasonic pulse testing. It is an important component of the ultrasonic pulse testing system for cast-in-place piles, and its material should have certain strength and rigidity.

[0003] A sonic logging pipe consists of two pipes sandwiched in mortar. The selection of materials for sonic logging pipes prioritizes high sound transmission, ease of installation, and low cost. Currently, commonly used pipes include steel pipes, corrugated steel pipes, and plastic pipes. Among these, corrugated steel pipes are widely used due to their thin walls, steel-saving properties, impermeability, pressure resistance, high strength, good flexibility, and light weight, making them very convenient to handle.

[0004] The service life of a sonic logging tube largely depends on the mortar layer in the middle. If cracks appear inside the mortar layer, air or water can get trapped, creating more highly reflective interfaces in the acoustic path and easily leading to misjudgments. To suppress the generation and development of cracks in the mortar, a common method is to add fibers to the mortar. However, ensuring that the fibers are evenly dispersed in the mortar and avoiding fiber isolation or agglomeration is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] This invention proposes a high-strength lightweight composite acoustic logging tube and its preparation method, which solves the problems of uneven fiber dispersion and easy agglomeration in mortar in related technologies.

[0006] The technical solution of the present invention is as follows:

[0007] A high-strength, lightweight composite acoustic logging pipe comprises, from the inside out, a galvanized steel corrugated pipe, a mortar layer, and a steel pipe;

[0008] The raw materials of the mortar layer include the following components in parts by weight: 25-35 parts cement, 20-30 parts sand, 15-25 parts fly ash, 1.5-2.5 parts mineral powder, 0.5-1.5 parts silica fume, 1.5-2.5 parts redispersible latex powder, 5-10 parts 4-amino-3-sulfon-1,8-naphthalic anhydride modified fiber, 0.1-0.2 parts cellulose, 0.1-0.3 parts water-reducing agent, and 15-25 parts water.

[0009] This invention utilizes a combination of fly ash and mineral powder to achieve a "composite cementitious effect," increasing the amount of CSH gel, reducing porosity, and improving the strength of the mortar layer. Furthermore, silica fume, as an ultrafine admixture, can significantly improve the density of the mortar layer, thereby enhancing its strength.

[0010] As a further technical solution, the thickness of the galvanized steel corrugated pipe is 0.2~0.4mm, the thickness of the mortar layer is 2~2.5mm, and the thickness of the steel pipe is 0.5~1.0mm.

[0011] As a further technical solution, the raw materials for the 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber include fibers and 4-amino-3-sulfon-1,8-naphthoic anhydride in a mass ratio of 1:1 to 5.

[0012] As a further technical solution, the raw materials for the 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber include fibers and 4-amino-3-sulfon-1,8-naphthoic anhydride in a mass ratio of 1:3.

[0013] As a further technical solution, the fiber includes glass fiber and / or carbon fiber.

[0014] As a further technical solution, the length of the fiber is 6~19mm.

[0015] As a further technical solution, the preparation method of the 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber includes the following steps: mixing fiber, 4-amino-3-sulfon-1,8-naphthoic anhydride, solvent and catalyst, and reacting to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0016] As a further technical solution, the solvent is water, and the catalyst is N-methylpyrrolidone.

[0017] As a further technical solution, the reaction temperature is 80~90℃ and the time is 2~4h.

[0018] As a further technical solution, the cellulose includes one or more of hydroxymethyl cellulose, hydroxypropyl methyl cellulose, and hydroxyethyl methyl cellulose;

[0019] The water-reducing agent includes one or two of naphthalene-based water-reducing agents and polycarboxylate-based water-reducing agents.

[0020] This invention also proposes a method for preparing a high-strength, lightweight composite acoustic logging tube, comprising the following steps:

[0021] S1. After the raw materials of the mortar layer are mixed evenly, a mixture is obtained;

[0022] S2. After assembling the galvanized steel corrugated pipe and the steel pipe, the mixture is poured into the middle part of the galvanized steel corrugated pipe and the steel pipe to obtain a high-strength lightweight composite acoustic pipe.

[0023] The working principle and beneficial effects of this invention are as follows:

[0024] 1. This invention uses 4-amino-3-sulfonyl-1,8-naphthalic anhydride modified fibers. The modified fiber surface contains sulfonic acid groups, which provide electrostatic repulsion to the fiber surface, thereby improving dispersibility and effectively solving the problem of fiber agglomeration into balls. This ensures that the fibers are evenly dispersed in the mortar layer. At the same time, the modified fiber surface also contains amino groups, which can form hydrogen bonds with water molecules, thereby forming a hydrophilic three-dimensional protective film. This further ensures the dispersion stability of the fibers in the mortar layer and solves the problems of uneven fiber dispersion and easy agglomeration into balls in the prior art. This achieves the technical effect of improving the strength and crack resistance of the mortar layer, thus providing a high-strength lightweight composite acoustic logging pipe.

[0025] 2. In this invention, the raw materials for the 4-amino-3-sulfon-1,8-naphthalic anhydride modified fiber are limited to fibers and 4-amino-3-sulfon-1,8-naphthalic anhydride in a mass ratio of 1:1 to 5, which further improves the strength and crack resistance of the mortar layer. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] A method for preparing a high-strength lightweight composite acoustic logging pipe: After fitting a 0.3mm galvanized steel corrugated pipe and a 0.8mm steel pipe together, a 2mm gap is left in the middle of the galvanized steel corrugated pipe and the steel pipe, and mortar mixture is poured in to obtain a high-strength lightweight composite acoustic logging pipe. The mortar mixture is prepared by the following examples and comparative examples, wherein the cement is ordinary Portland cement, PO42.5; the sand is river sand with a fineness modulus of 2.2; the fly ash is grade I fly ash; the mineral powder is S95 mineral powder; the silica fume is 1250 mesh; the redispersible latex powder is German Wacker 5010N redispersible latex powder; the polycarboxylate superplasticizer is polycarboxylate superplasticizer 530P; and the naphthalene superplasticizer is Point-N200 naphthalene high-efficiency superplasticizer.

[0028] Example 1

[0029] S1. Dissolve 10g of 4-amino-3-sulfon-1,8-naphthoic anhydride in 1L of water, add 10g of 6mm glass fiber and 0.5g of N-methylpyrrolidone, react at 85℃ for 3h, filter, wash with water, and dry to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0030] S2. Mix 30 parts cement, 25 parts sand, 20 parts fly ash, 2 parts mineral powder, 1 part silica fume, 2 parts redispersible latex powder, 10 parts 4-amino-3-sulfonyl-1,8-naphthalic anhydride modified fiber, 0.15 parts hydroxymethyl cellulose, and 0.2 parts polycarboxylate superplasticizer evenly, then add 20 parts water and continue mixing to obtain mortar mixture.

[0031] Example 2

[0032] S1. Dissolve 10g of 4-amino-3-sulfon-1,8-naphthoic anhydride in 1L of water, add 10g of 6mm glass fiber and 0.55g of N-methylpyrrolidone, react at 80℃ for 4h, filter, wash with water, and dry to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0033] S2. Mix 25 parts cement, 20 parts sand, 15 parts fly ash, 1.5 parts mineral powder, 0.5 parts silica fume, 1.5 parts redispersible latex powder, 5 parts 4-amino-3-sulfono-1,8-naphthenic anhydride modified fiber, 0.1 parts hydroxypropyl methylcellulose, and 0.1 parts polycarboxylate superplasticizer evenly, then add 15 parts water and continue mixing to obtain mortar mixture.

[0034] Example 3

[0035] S1. Dissolve 10g of 4-amino-3-sulfon-1,8-naphthoic anhydride in 1L of water, add 10g of 12mm carbon fiber and 0.45g of N-methylpyrrolidone, react at 90℃ for 2h, filter, wash with water, and dry to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0036] S2. Mix 35 parts cement, 30 parts sand, 25 parts fly ash, 2.5 parts mineral powder, 1.5 parts silica fume, 2.5 parts redispersible latex powder, 8 parts 4-amino-3-sulfonyl-1,8-naphthalic anhydride modified fiber, 0.2 parts hydroxyethyl methyl cellulose, and 0.3 parts naphthalene-based water-reducing agent evenly, then add 25 parts water and continue mixing to obtain mortar mixture.

[0037] Example 4

[0038] S1. Dissolve 30g of 4-amino-3-sulfon-1,8-naphthoic anhydride in 1L of water, add 10g of 6mm glass fiber and 0.5g of N-methylpyrrolidone, react at 85℃ for 3h, filter, wash with water, and dry to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0039] S2. Mix 30 parts cement, 25 parts sand, 20 parts fly ash, 2 parts mineral powder, 1 part silica fume, 2 parts redispersible latex powder, 10 parts 4-amino-3-sulfonyl-1,8-naphthalic anhydride modified fiber, 0.15 parts hydroxymethyl cellulose, and 0.2 parts polycarboxylate superplasticizer evenly, then add 20 parts water and continue mixing to obtain mortar mixture.

[0040] Example 5

[0041] S1. Dissolve 50g of 4-amino-3-sulfon-1,8-naphthoic anhydride in 1L of water, add 10g of 6mm glass fiber and 0.5g of N-methylpyrrolidone, react at 85℃ for 3h, filter, wash with water, and dry to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0042] S2. Mix 30 parts cement, 25 parts sand, 20 parts fly ash, 2 parts mineral powder, 1 part silica fume, 2 parts redispersible latex powder, 10 parts 4-amino-3-sulfonyl-1,8-naphthalic anhydride modified fiber, 0.15 parts hydroxymethyl cellulose, and 0.2 parts polycarboxylate superplasticizer evenly, then add 20 parts water and continue mixing to obtain mortar mixture.

[0043] Example 6

[0044] S1. Dissolve 30g of 4-amino-3-sulfon-1,8-naphthoic anhydride in 1L of water, add 10g of 9mm glass fiber and 0.5g of N-methylpyrrolidone, react at 85℃ for 3h, filter, wash with water, and dry to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0045] S2. Mix 30 parts cement, 25 parts sand, 20 parts fly ash, 2 parts mineral powder, 1 part silica fume, 2 parts redispersible latex powder, 10 parts 4-amino-3-sulfonyl-1,8-naphthalic anhydride modified fiber, 0.15 parts hydroxymethyl cellulose, and 0.2 parts polycarboxylate superplasticizer evenly, then add 20 parts water and continue mixing to obtain mortar mixture.

[0046] Example 7

[0047] S1. Dissolve 30g of 4-amino-3-sulfon-1,8-naphthoic anhydride in 1L of water, add 10g of 12mm glass fiber and 0.5g of N-methylpyrrolidone, react at 85℃ for 3h, filter, wash with water, and dry to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0048] S2. Mix 30 parts cement, 25 parts sand, 20 parts fly ash, 2 parts mineral powder, 1 part silica fume, 2 parts redispersible latex powder, 10 parts 4-amino-3-sulfonyl-1,8-naphthalic anhydride modified fiber, 0.15 parts hydroxymethyl cellulose, and 0.2 parts polycarboxylate superplasticizer evenly, then add 20 parts water and continue mixing to obtain mortar mixture.

[0049] Example 8

[0050] S1. Dissolve 30g of 4-amino-3-sulfon-1,8-naphthoic anhydride in 1L of water, add 10g of 15mm glass fiber and 0.5g of N-methylpyrrolidone, react at 85℃ for 3h, filter, wash with water, and dry to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0051] S2. Mix 30 parts cement, 25 parts sand, 20 parts fly ash, 2 parts mineral powder, 1 part silica fume, 2 parts redispersible latex powder, 10 parts 4-amino-3-sulfonyl-1,8-naphthalic anhydride modified fiber, 0.15 parts hydroxymethyl cellulose, and 0.2 parts polycarboxylate superplasticizer evenly, then add 20 parts water and continue mixing to obtain mortar mixture.

[0052] Example 9

[0053] S1. Dissolve 30g of 4-amino-3-sulfon-1,8-naphthoic anhydride in 1L of water, add 10g of 19mm glass fiber and 0.5g of N-methylpyrrolidone, react at 85℃ for 3h, filter, wash with water, and dry to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber.

[0054] S2. Mix 30 parts cement, 25 parts sand, 20 parts fly ash, 2 parts mineral powder, 1 part silica fume, 2 parts redispersible latex powder, 10 parts 4-amino-3-sulfonyl-1,8-naphthalic anhydride modified fiber, 0.15 parts hydroxymethyl cellulose, and 0.2 parts polycarboxylate superplasticizer evenly, then add 20 parts water and continue mixing to obtain mortar mixture.

[0055] Comparative Example 1

[0056] Mix 30 parts cement, 25 parts sand, 20 parts fly ash, 2 parts mineral powder, 1 part silica fume, 2 parts redispersible latex powder, 10 parts 6mm glass fiber, 0.15 parts hydroxymethyl cellulose, and 0.2 parts polycarboxylate superplasticizer evenly, then add 20 parts water and continue mixing to obtain mortar mixture.

[0057] The mortar mixtures obtained in Examples 1-9 and Comparative Example 1 were tested for splitting tensile strength at 28 days of age according to the method in GB / T 29417-2012 "Test Method for Drying Shrinkage Cracking Performance of Cement Mortar and Concrete", and for compressive strength at 28 days of age according to the method in GB / T11837-2009 "Test Method for Compressive Strength of Concrete for Pipes". The test results are recorded in Table 1.

[0058] Table 1 Compressive strength and splitting tensile strength

[0059]

[0060] As can be seen from Table 1, the mortar mixture provided by the present invention has a 28-day compressive strength of over 64.5 MPa and a 28-day splitting tensile strength of over 5.61 MPa, exhibiting high strength and good crack resistance.

[0061] Compared with Comparative Example 1, Examples 1-9 used 4-amino-3-sulfon-1,8-naphthalic anhydride modified fibers, while Comparative Example 1 did not modify the fibers. The 28-day compressive strength and 28-day splitting tensile strength of the mortar mixtures obtained in Examples 1-9 were higher than those in Comparative Example 1, indicating that the use of 4-amino-3-sulfon-1,8-naphthalic anhydride modified fibers can improve the dispersibility of fibers in mortar, thereby improving the strength and crack resistance of the mortar layer.

[0062] Compared with Examples 4-5, Examples 1-3 had a 1:1 mass ratio of fiber to 4-amino-3-sulfon-1,8-naphthalic anhydride, Examples 4 had a 1:3 mass ratio of fiber to 4-amino-3-sulfon-1,8-naphthalic anhydride, and Examples 5 had a 1:5 mass ratio of fiber to 4-amino-3-sulfon-1,8-naphthalic anhydride. The 28-day compressive strength and 28-day splitting tensile strength of the mortar mixture obtained in Example 4 were higher than those in Examples 1-3 and Example 5. This indicates that a 1:3 mass ratio of fiber to 4-amino-3-sulfon-1,8-naphthalic anhydride can further improve the strength and crack resistance of the mortar layer.

[0063] The high-strength lightweight composite acoustic logging tube obtained in Example 1 was tested for appearance quality, dimensional deviation, flattening resistance and sealing pressure resistance according to the methods in GB / T 246-2017 "Metallic Materials Tube Flattening Test Method" and GB / T 31438-2015 "Steel Thin-walled Acoustic Logging Tube for Concrete Cast-in-Place Piles". The test results are recorded in Table 2.

[0064] Table 2. Pressure resistance and sealing pressure resistance of high-strength lightweight composite acoustic tubes.

[0065]

[0066] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength, lightweight composite acoustic logging tube, characterized in that, From the inside out, it consists of a galvanized steel corrugated pipe, a mortar layer, and a steel pipe. The raw materials of the mortar layer include the following components in parts by weight: 25-35 parts cement, 20-30 parts sand, 15-25 parts fly ash, 1.5-2.5 parts mineral powder, 0.5-1.5 parts silica fume, 1.5-2.5 parts redispersible latex powder, 5-10 parts 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber, 0.1-0.2 parts cellulose, 0.1-0.3 parts water-reducing agent, and 15-25 parts water. The preparation method of the 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber includes the following steps: mixing fiber, 4-amino-3-sulfon-1,8-naphthoic anhydride, solvent, and catalyst, and reacting to obtain 4-amino-3-sulfon-1,8-naphthoic anhydride modified fiber; the fiber includes glass fiber and / or carbon fiber; the catalyst is N-methylpyrrolidone; the reaction temperature is 80-90℃, and the time is 2-4 hours.

2. The high-strength lightweight composite acoustic logging tube according to claim 1, characterized in that, The thickness of the galvanized steel corrugated pipe is 0.2~0.4mm, the thickness of the mortar layer is 2~2.5mm, and the thickness of the steel pipe is 0.5~1.0mm.

3. The high-strength lightweight composite acoustic logging tube according to claim 1, characterized in that, The raw materials for the 4-amino-3-sulfon-1,8-naphthalic anhydride modified fiber include fibers and 4-amino-3-sulfon-1,8-naphthalic anhydride in a mass ratio of 1:1 to 5.

4. The high-strength lightweight composite acoustic logging tube according to claim 1, characterized in that, The fiber has a length of 6-19 mm.

5. A high-strength, lightweight composite acoustic logging tube according to claim 1, characterized in that, The solvent is water.

6. A high-strength, lightweight composite acoustic logging tube according to claim 1, characterized in that, The cellulose includes one or more of hydroxymethyl cellulose, hydroxypropyl methyl cellulose, and hydroxyethyl methyl cellulose; The water-reducing agent includes one or two of naphthalene-based water-reducing agents and polycarboxylate-based water-reducing agents.

7. A method for preparing a high-strength lightweight composite acoustic logging tube according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. After the raw materials of the mortar layer are mixed evenly, a mixture is obtained; S2. After assembling the galvanized steel corrugated pipe and the steel pipe, the mixture is poured into the middle part of the galvanized steel corrugated pipe and the steel pipe to obtain a high-strength lightweight composite acoustic pipe.

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