Prefabricated concrete drainage pipe with corrosion-resistant concrete structure layer and manufacturing method of prefabricated concrete drainage pipe

Abstract

The invention belongs to the technical field of prefabricated concrete drainage pipe production, and provides a prefabricated concrete drainage pipe with a corrosion-resistant concrete structure layer and a manufacturing method of the prefabricated concrete drainage pipe. The prefabricated concrete drain pipe comprises a corrosion-resistant concrete structure layer and a concrete pipe body, the raw materials of the corrosion-resistant concrete structure layer comprise a corrosion-resistant mortar material and fibers; the corrosion-resistant mortar material comprises cement, an active admixture, fine aggregate, an additive and water. The manufacturing method comprises the following steps: producing the corrosion-resistant concrete structure layer in advance, and then pouring the corrosion-resistant concrete structure layer and the concrete pipe body into a whole; or the corrosion-resistant concrete structure layer is poured on the inner wall of the produced concrete pipe body. The corrosion resistance of the corrosion-resistant concrete structure layer is improved by 10-100 times compared with that of a common concrete layer used by the pipe body; the material property of the corrosion-resistant concrete structure layer and the pipe body are both cement-based materials, the corrosion-resistant concrete structure layer and the pipe body material can achieve common bearing well, the separation problem caused by aging and material difference does not exist, and the excellent durability is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of precast concrete drainage pipe production, and in particular relates to a precast concrete drainage pipe with a corrosion-resistant concrete structural layer and a manufacturing method thereof. Background Art

[0002] With the continuous improvement of the level of social and economic development and the country's promotion of environmental protection, energy conservation and green economy, various reinforced concrete pipes are widely used in the construction of municipal, transportation, farmland water conservancy and other pipeline networks.

[0003] The concrete strength grade of ordinary reinforced concrete pipes is generally C30-C50, and the corrosion resistance is average. When used in sewage pipe networks, due to the strong corrosiveness of sewage, the pipes can be corroded within 10 years, which significantly affects the structural bearing capacity or requires major repairs. In order to solve the corrosion resistance problem of concrete pipes, the industry has adopted a variety of methods, such as setting additional anti-corrosion layers such as PVC, PE, fiberglass, and anti-corrosion coatings on the surface of the pipes. These anti-corrosion measures all have a certain anti-corrosion effect, but because the materials listed above are made of different materials from the concrete pipe body itself, they cannot produce consistent deformation with the concrete pipe body under external forces or environmental effects. After a period of use, they often crack, fall off, and other defects with the concrete pipe body, and cannot reach the service life required by the engineering design (generally 50 years). Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the first object of the present invention is to provide a precast concrete drainage pipe with a corrosion-resistant concrete structural layer. The corrosion-resistant concrete structural layer of the precast concrete drainage pipe has a compressive strength of not less than 80MPa, a tensile strength of not less than 5.0MPa, and a chloride ion permeability coefficient D RCM No more than 0.4×10 -12 m 2 / s, and the sulfate corrosion resistance level is not less than KS150. Its corrosion resistance is 10-100 times higher than that of the ordinary concrete layer used in the pipe body, which can provide excellent corrosion resistance for the inner wall of the pipe. The material properties of the corrosion-resistant concrete structure layer are the same as those of the pipe body (both are cement-based materials), which can be well carried together with the pipe body material. There is no problem of separation caused by aging and material differences. It has excellent durability. The entire pipe has a service life of not less than 50 years in various sewage environments.

[0005] In view of the above-mentioned deficiencies in the prior art, the second object of the present invention is to provide a method for manufacturing a precast concrete drainage pipe with a corrosion-resistant concrete structural layer. The manufacturing method effectively solves the problems such as production quality assurance of the corrosion-resistant concrete structural layer of the precast concrete drainage pipe, and has the advantages of low production cost and guaranteed production quality. It can not only replace the traditional production process of the corrosion-resistant concrete structural layer of the precast concrete drainage pipe, but also has better cost and efficiency performance than the traditional corrosion-resistant concrete structural layer of the precast concrete drainage pipe, and is suitable for large-scale promotion and application.

[0006] In order to achieve the above object, the solution adopted by the present invention is:

[0007] A precast concrete drainage pipe with a corrosion-resistant concrete structural layer comprises a corrosion-resistant concrete structural layer and a concrete pipe body which are sequentially arranged from the inside to the outside; the raw materials of the corrosion-resistant concrete structural layer comprise corrosion-resistant mortar material and fiber; the corrosion-resistant mortar material comprises, by weight, 0.05-0.2 parts of cement, 0.6-0.8 parts of active admixture, 1.5-1.7 parts of fine aggregate, 0.05-0.07 parts of admixture and 0.4-0.6 parts of water; the volume ratio of fiber to corrosion-resistant mortar material is 0.030-0.035:1.

[0008] Furthermore, in a preferred embodiment of the present invention, the thickness of the corrosion-resistant concrete structure layer is 10-60 mm.

[0009] Furthermore, in a preferred embodiment of the present invention, it also includes a rough surface arranged between the corrosion-resistant concrete structure layer and the concrete pipe body.

[0010] Furthermore, in a preferred embodiment of the present invention, the rough surface is arranged on the outer wall of the corrosion-resistant concrete structure layer, or the rough surface is arranged on the inner wall of the concrete pipe body.

[0011] Furthermore, in a preferred embodiment of the present invention, it also includes stress-bearing steel bars arranged on the inner wall of the concrete tube body, and the stress-bearing steel bars are arranged inside the corrosion-resistant concrete structural layer, or arranged between the corrosion-resistant concrete structural layer and the concrete tube body.

[0012] Furthermore, in a preferred embodiment of the present invention, the active admixture includes at least two of fly ash, mineral powder, silica fume, microspheres and expansion agent.

[0013] Furthermore, in a preferred embodiment of the present invention, the fine aggregate includes at least one of quartz sand, natural sand and artificial sand.

[0014] Furthermore, in a preferred embodiment of the present invention, the admixture is an admixture that can reduce water and improve pumping effect.

[0015] Further, in a preferred embodiment of the present invention, the cement grade is higher than or equal to grade 42.5.

[0016] A method for manufacturing the above-mentioned precast concrete drainage pipe with a corrosion-resistant concrete structural layer includes: pre-producing the corrosion-resistant concrete structural layer and casting it as a component with the concrete pipe body into a whole, or casting the corrosion-resistant concrete structural layer on the inner wall of the produced concrete pipe body.

[0017] The precast concrete drainage pipe with a corrosion-resistant concrete structural layer and the manufacturing method thereof provided by the present invention have the following beneficial effects:

[0018] (1) The precast concrete drainage pipe with a corrosion-resistant concrete structure layer provided by the present invention has a layer of the corrosion-resistant concrete structure layer cast on the inner wall of the pipe. The corrosion resistance of the corrosion-resistant concrete structure layer is 10-100 times higher than that of the ordinary concrete layer used in the pipe body, providing excellent corrosion resistance for the inner wall of the pipe. Specifically, the corrosion-resistant concrete structure layer of the precast concrete drainage pipe has a compressive strength of not less than 80MPa, a tensile strength of not less than 5.0MPa, and a chloride ion permeability resistance coefficient D RCM No more than 0.4×10 -12 m 2 / s, and the sulfate corrosion resistance grade is not less than KS150.

[0019] (2) The precast concrete drainage pipe with a corrosion-resistant concrete structural layer provided by the present invention adopts the same cement-based material as the pipe body concrete, and has the same material properties, so that the two can achieve good bonding and joint force effects. Their mechanical properties are consistent, and the interface between the two will not produce relative displacement when affected by the outside world and the environment. Therefore, in addition to having excellent corrosion resistance, the precast concrete drainage pipe with a corrosion-resistant concrete structural layer provided by the present invention also has excellent durability. The entire pipe has a service life of not less than 50 years when used in various sewage environments.

[0020] (3) The prefabricated concrete drainage pipe with a corrosion-resistant concrete structural layer provided by the present invention can, on the one hand, greatly improve the pipe's ability to withstand sewage corrosion in the pipe, and on the other hand, can increase the cost at a lower level than ordinary pipes.

[0021] (4) The manufacturing method of the precast concrete drainage pipe with a corrosion-resistant concrete structural layer provided by the present invention is suitable for using existing production molds and equipment for ordinary reinforced concrete pipes, and can maximize the use of existing equipment. The corrosion resistance of ordinary concrete drainage pipes can be significantly improved by simply adding mold parts required for producing the corrosion-resistant concrete structural layer.

[0022] (5) The manufacturing method of the precast concrete drainage pipe with a corrosion-resistant concrete structural layer provided by the present invention can be applied to add a corrosion-resistant concrete structural layer to an already produced ordinary concrete drainage pipe, thereby significantly improving its corrosion resistance.

[0023] (6) The manufacturing method provided by the present invention can be applied to concrete pipes with an inner diameter ranging from 500 mm to 4000 mm, and can also be applied to pipes with larger diameters. The length of a single section of the pipe structure can be selected to be 1 m to 4 m as required. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0025] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0026] Example 1

[0027] The present embodiment provides a precast concrete drain pipe with a corrosion-resistant concrete structural layer, including a corrosion-resistant concrete structural layer and a concrete pipe body arranged in sequence from the inside to the outside. The raw materials of the corrosion-resistant concrete structural layer include corrosion-resistant mortar materials and fibers (basalt fiber: glass fiber = 1:1). The corrosion-resistant mortar material includes, by weight: 0.05 parts of cement, 0.8 parts of active admixture (ash fly ash: mineral powder: silica ash: microbeads = 1:1:1:1), 1.5 parts of fine aggregate (natural sand: artificial sand = 1:1), 0.07 parts of polycarboxylate and 0.4 parts of water; the volume ratio of fiber to corrosion-resistant mortar material is: 0.032:1.

[0028] This embodiment also provides a method for manufacturing a precast concrete drainage pipe with a corrosion-resistant concrete structural layer, comprising: pouring the corrosion-resistant concrete structural layer on the inner wall of a produced concrete pipe body.

[0029] Example 2

[0030] The present embodiment provides a precast concrete drain pipe with a corrosion-resistant concrete structural layer, including a corrosion-resistant concrete structural layer and a concrete pipe body arranged in sequence from the inside to the outside. The raw materials of the corrosion-resistant concrete structural layer include corrosion-resistant mortar materials and fibers (basalt fiber: glass fiber = 1:1). The corrosion-resistant mortar material includes, by weight: 0.2 parts of cement, 0.6 parts of active admixture (ash fly ash: mineral powder: silica ash: microbeads = 1:1:1:1), 1.7 parts of fine aggregate (natural sand: artificial sand = 1:1), 0.05 parts of polycarboxylate and 0.6 parts of water; the volume ratio of fiber to corrosion-resistant mortar material is: 0.030:1.

[0031] This embodiment also provides a method for manufacturing a precast concrete drainage pipe with a corrosion-resistant concrete structural layer, please refer to Example 1.

[0032] Example 3

[0033] The present embodiment provides a precast concrete drain pipe with a corrosion-resistant concrete structural layer, including a corrosion-resistant concrete structural layer and a concrete pipe body arranged in sequence from the inside to the outside. The raw materials of the corrosion-resistant concrete structural layer include corrosion-resistant mortar materials and fibers (basalt fiber: glass fiber = 1:1). The corrosion-resistant mortar material includes, by weight: 0.1 parts of cement, 0.7 parts of active admixture (ash fly ash: mineral powder: silica ash: microbeads = 1:1:1:1), 1.6 parts of fine aggregate (natural sand: artificial sand = 1:1), 0.06 parts of polycarboxylate and 0.5 parts of water; the volume ratio of fiber to corrosion-resistant mortar material is: 0.032:1.

[0034] This embodiment also provides a method for manufacturing a precast concrete drainage pipe with a corrosion-resistant concrete structural layer, please refer to Example 1.

[0035] Example 4

[0036] The present embodiment provides a precast concrete drainage pipe with a corrosion-resistant concrete structural layer, including a corrosion-resistant concrete structural layer and a concrete pipe body arranged in sequence from the inside to the outside. The raw materials of the corrosion-resistant concrete structural layer include corrosion-resistant mortar materials and fibers (basalt fiber: glass fiber = 1:1). The corrosion-resistant mortar material includes, by weight: 0.1 parts of cement, 0.7 parts of active admixture (ash fly ash: mineral powder: silica ash: microbeads = 1:1:1:1), 1.6 parts of fine aggregate (natural sand: artificial sand = 1:1), 0.06 parts of polycarboxylate and 0.5 parts of water; the volume ratio of fiber to corrosion-resistant mortar material is: 0.030:1.

[0037] This embodiment also provides a method for manufacturing a precast concrete drainage pipe with a corrosion-resistant concrete structural layer, please refer to Example 1.

[0038] Example 5

[0039] The present embodiment provides a precast concrete drain pipe with a corrosion-resistant concrete structural layer, including a corrosion-resistant concrete structural layer and a concrete pipe body arranged in sequence from the inside to the outside. The raw materials of the corrosion-resistant concrete structural layer include corrosion-resistant mortar materials and fibers (basalt fiber: glass fiber = 1:1). The corrosion-resistant mortar material includes, by weight: 0.1 parts of cement, 0.7 parts of active admixture (ash fly ash: mineral powder: silica ash: microbeads = 1:1:1:1), 1.6 parts of fine aggregate (natural sand: artificial sand = 1:1), 0.06 parts of polycarboxylate and 0.5 parts of water; the volume ratio of fiber to corrosion-resistant mortar material is: 0.035:1.

[0040] This embodiment also provides a method for manufacturing a precast concrete drainage pipe with a corrosion-resistant concrete structural layer, please refer to Example 1.

[0041] Example 6

[0042] The present embodiment provides a precast concrete drain pipe with a corrosion-resistant concrete structural layer, comprising a corrosion-resistant concrete structural layer and a concrete pipe body arranged in sequence from the inside to the outside. The raw materials of the corrosion-resistant concrete structural layer include corrosion-resistant mortar material and basalt fiber. The corrosion-resistant mortar material includes, by weight: 0.1 parts of cement, 0.7 parts of active admixture (ash fly ash: mineral powder: silica fume = 2:1:3), 1.6 parts of fine aggregate (natural sand), 0.06 parts of polycarboxylate and 0.5 parts of water; the volume ratio of basalt fiber to corrosion-resistant mortar material is: 0.032:1.

[0043] This embodiment also provides a method for manufacturing a precast concrete drainage pipe with a corrosion-resistant concrete structural layer, please refer to Example 1.

[0044] Example 7

[0045] The present embodiment provides a precast concrete drain pipe with a corrosion-resistant concrete structural layer, comprising a corrosion-resistant concrete structural layer and a concrete pipe body arranged in sequence from the inside to the outside. The raw materials of the corrosion-resistant concrete structural layer include corrosion-resistant mortar material and glass fiber. The corrosion-resistant mortar material includes, by weight: 0.1 parts of cement, 0.7 parts of active admixture (mineral powder: silica fume: microbeads = 2:2:1), 1.6 parts of fine aggregate (quartz sand), 0.06 parts of polycarboxylate and 0.5 parts of water; the volume ratio of glass fiber to corrosion-resistant mortar material is: 0.032:1.

[0046] This embodiment also provides a method for manufacturing a precast concrete drainage pipe with a corrosion-resistant concrete structural layer, please refer to Example 1.

[0047] Comparative Example 1

[0048] This comparative example provides a common concrete pipe body, which is composed of a concrete pipe body, wherein the materials for preparing the concrete pipe body include, by weight: 1.0 part of cement, 1.5 parts of natural sand, 2.0 parts of quartz crushed stone and 0.4 parts of water.

[0049] This comparative example also provides a method for manufacturing an ordinary concrete pipe body, comprising: pouring the material of the above-mentioned concrete pipe body into a mold in which a stress-bearing steel bar skeleton is placed, and curing to form an ordinary concrete pipe body.

[0050] Comparative Example 2

[0051] This comparative example provides a concrete pipe body with a corrosion-resistant additional layer, comprising a corrosion-resistant additional layer and a concrete pipe body arranged in sequence from the inside to the outside. The corrosion-resistant additional layer is made of PVC material with a thickness of 2 mm, and a key groove arranged on the back of the corrosion-resistant additional layer material is embedded in the concrete pipe body to a certain depth (generally 1-2 cm) to prevent the additional layer from falling off.

[0052] This comparative example also provides a method for manufacturing a concrete pipe body with an additional corrosion-resistant layer, comprising: vertically laying the additional corrosion-resistant layer on the inner mold of a circular pipe mold, then placing a stressed steel reinforcement skeleton in the mold cavity, pouring concrete in the mold cavity, and curing to form a concrete pipe body with an additional corrosion-resistant layer.

[0053] Comparative Example 3

[0054] This comparative example provides a corrosion-resistant concrete pipe body, which is made entirely of corrosion-resistant concrete. The raw materials of the corrosion-resistant concrete pipe body include corrosion-resistant concrete material and steel fiber. The corrosion-resistant concrete material includes, by weight: 0.5 parts of cement, 0.5 parts of active admixture (ash fly ash: mineral powder: silica fume: microspheres = 1:1:1:1), 1.6 parts of fine aggregate (natural sand: artificial sand = 1:1), 0.06 parts of polycarboxylate and 0.5 parts of water; the volume ratio of fiber to corrosion-resistant concrete material is: 0.04:1.

[0055] The comparative example also provides a method for manufacturing a corrosion-resistant concrete pipe body, comprising: pouring raw materials of the corrosion-resistant concrete pipe body into a mold in which a stress-bearing steel bar skeleton is placed, and curing to form the corrosion-resistant concrete pipe body.

[0056] Experimental Example 1

[0057] Experimental method: The corrosion-resistant concrete structural layer provided by Examples 1-7 and the concrete pipe body provided by Comparative Examples 1-3 were tested for compressive strength (tested according to the method provided by "GB / T50081 (current version)"), chloride ion permeability coefficient (tested according to the method provided by "GB / T50082 (current version)"), sulfate erosion resistance coefficient (tested according to the method provided by "GB / T50082 (current version)") and tensile strength (tested according to the method provided by "GB / T50081 (current version)") at 28 days of age. The test results are shown in Table 1:

[0058] Table 1

[0059]

[0060] It can be seen from the data in Table 1 that the precast concrete drainage pipe with a corrosion-resistant concrete structure layer and the manufacturing method thereof provided by Examples 1-7 of the present invention has a compressive strength of not less than 80 MPa, a tensile strength of not less than 5.0 MPa, and a chloride ion permeability coefficient of not more than 0.4×10 -12 m 2 / s, and the sulfate corrosion resistance grade is not less than KS150.

[0061] Compared with the ordinary concrete drainage pipe (28-day cubic compressive strength is not less than 40 MPa) manufactured by the current common casting process adopted in Comparative Example 1, the corrosion-resistant concrete structural layer of the precast concrete drainage pipe with a corrosion-resistant concrete structural layer provided by the embodiment of the present invention has very excellent corrosion resistance and mechanical properties, and can maintain good working performance for a long time in moderate or even severe corrosion environments.

[0062] At the same time, the data of comparative examples 2 and 3 further illustrate that the precast concrete drainage pipe with a corrosion-resistant concrete structural layer prepared within the components and ratio range of the corrosion-resistant mortar material provided in Examples 1-7 of the present invention, and the ratio range of the corrosion-resistant mortar material and the fiber, has more excellent corrosion resistance, mechanical properties and economy.

[0063] In summary, the precast concrete drainage pipe with a corrosion-resistant concrete structural layer provided by the present invention has a compressive strength of not less than 80 MPa, a tensile strength of not less than 5.0 MPa, and a chloride ion permeability coefficient D RCM No more than 0.4×10 -12 m 2 / s, and the sulfate corrosion resistance level is not less than KS150. Its corrosion resistance is 10-100 times higher than that of the ordinary concrete layer used in the pipe body, which can provide excellent corrosion resistance for the inner wall of the pipe. The corrosion-resistant concrete structure layer will not fall off or crack from the pipe wall when affected by the outside world and the environment. It has excellent durability. The entire pipe has a service life of not less than 50 years in various sewage environments.

[0064] The manufacturing method of the precast concrete drainage pipe with the corrosion-resistant concrete structural layer provided by the present invention effectively solves the problems such as production quality assurance of the corrosion-resistant concrete structural layer of the precast concrete drainage pipe, and has the advantages of low production cost and guaranteed production quality. It can not only replace the traditional production process of the corrosion-resistant concrete structural layer of the precast concrete drainage pipe, but also has better cost and efficiency performance than the traditional corrosion-resistant concrete structural layer of the precast concrete drainage pipe, and is suitable for large-scale promotion and application.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A precast concrete drain pipe with a corrosion-resistant concrete structural layer, characterized in that: It includes the corrosion-resistant concrete structure layer and the concrete pipe body arranged in sequence from the inside to the outside; The raw materials of the corrosion-resistant concrete structural layer include corrosion-resistant mortar materials and fibers; The corrosion-resistant mortar material comprises, by weight, 0.05-0.2 parts of cement, 0.6-0.8 parts of active admixture, 1.5-1.7 parts of fine aggregate, 0.05-0.07 parts of admixture and 0.4-0.6 parts of water; the volume ratio of the fiber to the corrosion-resistant mortar material is 0.030-0.035:

1.

2. The precast concrete drain pipe with a corrosion-resistant concrete structural layer according to claim 1, characterized in that: The thickness of the corrosion-resistant concrete structural layer is 10-60 mm.

3. The precast concrete drain pipe with a corrosion-resistant concrete structural layer according to claim 1, characterized in that: It also includes a rough surface arranged between the corrosion-resistant concrete structure layer and the concrete pipe body.

4. The precast concrete drain pipe with a corrosion-resistant concrete structural layer according to claim 3 is characterized in that: The rough surface is arranged on the outer wall of the corrosion-resistant concrete structure layer, or the rough surface is arranged on the inner wall of the concrete pipe body.

5. The precast concrete drain pipe with a corrosion-resistant concrete structural layer according to claim 1, characterized in that: It also includes stress-bearing steel bars arranged on the inner wall of the concrete tube body, and the stress-bearing steel bars are arranged inside the corrosion-resistant concrete structural layer, or between the corrosion-resistant concrete structural layer and the concrete tube body.

6. The precast concrete drain pipe with a corrosion-resistant concrete structural layer according to claim 1, characterized in that: The active admixture includes at least two of fly ash, mineral powder, silica fume and microspheres.

7. The precast concrete drainage pipe with a corrosion-resistant concrete structural layer according to claim 1, characterized in that: The fine aggregate includes at least one of quartz sand, natural sand and artificial sand.

8. The precast concrete drain pipe with a corrosion-resistant concrete structural layer according to claim 1, characterized in that: The admixture is an admixture that has the effect of reducing water and improving pumping effect.

9. The precast concrete drain pipe with a corrosion-resistant concrete structural layer according to claim 1, characterized in that: The cement grade is higher than or equal to grade 42.

5.

10. A method for manufacturing a precast concrete drainage pipe having a corrosion-resistant concrete structural layer according to any one of claims 1 to 9, characterized in that: include: The corrosion-resistant concrete structure layer is produced in advance and then cast as a component together with the concrete pipe body to form a whole; or the corrosion-resistant concrete structure layer is cast on the inner wall of the produced concrete pipe body.

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