Preparation method of glass reinforced concrete pipe and glass reinforced concrete pipe

Abstract

The invention provides a preparation method of a glass reinforced concrete pipe and the glass reinforced concrete pipe, and relates to the technical field of water pipe structures.The method comprises the steps that a concrete material and composite reinforcing ribs are prepared; binding the composite reinforcing ribs to obtain a reinforced framework; placing the reinforced framework in a specified mold, and then pouring a concrete material to obtain a glass reinforced concrete pipe; wherein the concrete material comprises shale ceramisite, and the mass ratio of the shale ceramisite is 27.4%-30.3%; the composite reinforcing ribs comprise alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin. According to the invention, the shale ceramsite is used for replacing stone aggregate in the prior art, and the framework is prepared from the composite reinforcing ribs prepared from the alkali-free untwisted glass fiber continuous roving and the unsaturated polyester resin to replace a steel bar framework in the prior art, so that the compressive strength and the impermeability are improved, and meanwhile, the self weight is reduced; and the technical problem that the framework is easy to rust is solved, and long-term safety and reliability of actual engineering are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of water pipe structures, and in particular to a preparation method of a glass reinforced concrete pipe and a glass reinforced concrete pipe. Background Art

[0002] Drainage systems are an important part of urban infrastructure, responsible for collecting and discharging rainwater, domestic sewage and industrial wastewater. The design, material selection and construction technology of drainage pipes directly affect the reliability and efficiency of the system.

[0003] There are many types of pipe materials in the current water supply and drainage industry, the most common ones are prestressed reinforced concrete pipes, fiberglass pipes, etc. Each pipe has its advantages and disadvantages. Among them, concrete pipes are one of the most commonly used pipes in drainage systems, and are widely used due to their high strength, good durability and moderate cost.

[0004] However, the strength of concrete pipes needs to be further improved. Since concrete pipes are mostly made of cement, sand and gravel, the weight of the pipes themselves is too large, making transportation and lifting very troublesome. In addition, the steel skeleton in the pipes is prone to rust after long-term use, resulting in cumbersome construction and the long-term safety and reliability of the actual project cannot be guaranteed. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a method for preparing a glass reinforced concrete pipe to alleviate the technical problems in the prior art that the concrete pipe itself is too heavy and the reliability of the pipe cannot be guaranteed.

[0006] In a first aspect, an embodiment of the present invention provides a method for preparing a glass reinforced concrete pipe, the method comprising:

[0007] preparing concrete materials and composite reinforcements;

[0008] The composite reinforcement is tied to obtain a reinforced skeleton;

[0009] Placing the reinforcement frame in a designated mold and then pouring concrete material to obtain a glass reinforced concrete pipe;

[0010] Among them, the concrete material includes shale ceramsite, and the mass proportion of shale ceramsite is 27.4% to 30.3%;

[0011] The composite reinforcing bar comprises alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin.

[0012] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, the step of preparing a concrete material includes:

[0013] Premixing shale ceramsite, medium-coarse sand, fly ash, silica fume and cement to obtain a premixed material;

[0014] The conditioning solution is added to the ready-mixed material and stirred to obtain a concrete material.

[0015] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, the step of adding a regulating solution to the premixed material and stirring the premixed material comprises:

[0016] Add a set amount of water to the premixed material and mix for a first time;

[0017] Continue to add the set amount of water and water reducing agent again and stir for a second time to obtain a concrete material;

[0018] Among them, the second duration is longer than the first duration.

[0019] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation of the first aspect, where the concrete material includes:

[0020] 27.4-30.3 parts of shale expanded clay, 32.7-34.1 parts of medium coarse sand, 22.6-23.5 parts of cement, 3.4-3.5 parts of fly ash, 2.3-2.4 parts of silica fume, 9.0-10.2 parts of water, and 0.3-0.5 parts of water reducer.

[0021] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the weight ratio of the medium sand to the coarse sand in the medium-coarse sand is 1:2.

[0022] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, the steps of preparing a concrete material and a composite reinforcement bar include:

[0023] After combing the alkali-free untwisted glass fiber continuous roving, the roving is impregnated with liquid unsaturated polyester resin to obtain a liquid-impregnated continuous yarn;

[0024] curing the impregnated continuous yarn to obtain a target composite reinforcement including alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin;

[0025] The target composite reinforcement is cut into fixed lengths to obtain a plurality of annular composite reinforcements and a plurality of strip composite reinforcements.

[0026] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation manner of the first aspect, the step of curing the liquid-impregnated continuous yarn comprises:

[0027] After the bubbles in the interstices of the impregnated continuous yarn are removed, the threads are wound and initially cured to obtain a primary composite reinforcement;

[0028] The primary composite reinforcement is drawn, wound around the thread and solidified again to obtain the target composite reinforcement.

[0029] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation of the first aspect, wherein the step of tying the composite reinforcing ribs to obtain a reinforced skeleton includes:

[0030] Arrange multiple annular composite reinforcing ribs at intervals along the same direction;

[0031] A plurality of strip-shaped composite reinforcing ribs are arranged at intervals along the circumference of the annular composite reinforcing ribs, and are respectively tied to the plurality of annular composite reinforcing ribs one by one to obtain a reinforced skeleton.

[0032] In combination with the first aspect, the embodiment of the present invention provides a first possible implementation of the first aspect, wherein the steps of placing a reinforcement frame in a designated mold and then pouring concrete material to obtain a glass reinforced concrete pipe include:

[0033] Continuously pouring concrete material into the reinforcement frame in the specified mold until the cast concrete pipe has a specified strength;

[0034] The designated mold is removed, and the concrete pipe is covered and cured for a designated period of time by sprinkling water to retain moisture, thereby obtaining a glass reinforced concrete pipe.

[0035] In a second aspect, the present application provides a glass reinforced concrete pipe, which is made by providing a preparation method of a glass reinforced concrete pipe.

[0036] The embodiments of the present invention bring the following beneficial effects:

[0037] The present invention provides a method for preparing a glass reinforced concrete pipe, comprising: preparing concrete material and composite reinforcing bars; tying the composite reinforcing bars to obtain a reinforcing skeleton; placing the reinforcing skeleton in a designated mold and then pouring concrete material to obtain a glass reinforced concrete pipe; wherein the concrete material comprises shale ceramsite, and the mass proportion of the shale ceramsite is 27.4% to 30.3%; the composite reinforcing bars comprise alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin.

[0038] Specifically, in the present invention, the concrete material replaces the stone aggregate in the prior art with shale ceramsite, and the weight of the concrete pipe body made of raw materials such as cement is significantly reduced and the compressive strength and impermeability of the concrete pipe can be improved. In addition, in the present invention, a skeleton is made of composite reinforcing bars made of alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin to replace the steel skeleton in the prior art, thereby alleviating the technical problems of low tensile strength and easy corrosion of ordinary steel bars, large weight of steel skeletons, and short service life. The glass reinforced concrete pipe made of the composite reinforcing bars and concrete with shale ceramsite as the main material improves the compressive strength and impermeability while reducing its own weight, thereby reducing the difficulty of transportation and hoisting. At the same time, it also overcomes the technical problem that the skeleton is easy to rust after long-term use, thereby ensuring the long-term safety and reliability of the actual project.

[0039] The glass reinforced concrete pipe provided by the present invention is prepared by a method for preparing a glass reinforced concrete pipe. The beneficial effects of the formed glass reinforced concrete pipe are the same as those of the above method, which will not be described in detail herein.

[0040] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A schematic flow chart of a method for preparing a glass reinforced concrete pipe provided in an embodiment of the present invention;

[0044] Figure 2 A schematic diagram of the structure of a reinforced skeleton is provided for an embodiment of the present invention;

[0045] Figure 3 A schematic structural diagram of a glass reinforced concrete pipe provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0047] In order to facilitate the understanding of this embodiment, the technical background of the design of this application is briefly introduced below.

[0048] There are many types of pipe materials in the current water supply and drainage industry, the most common ones are prestressed reinforced concrete pipes, glass fiber reinforced plastic pipes, etc. Each pipe has its advantages and disadvantages. For example, prestressed reinforced concrete pipes have high rigidity and low price, but their strength needs to be further improved. They are heavy, difficult to transport and hoist, and the steel bars are prone to rust. Glass fiber reinforced plastic pipes have high strength, corrosion resistance, and good hydraulic performance, but low rigidity. In many projects, especially some offshore platform projects and nuclear power circulating water pipeline projects, a pipe and pipe structure with high rigidity, corrosion resistance of steel bars, good strength performance, long service life, and low cost is required to ensure the long-term safety and reliability of the actual project.

[0049] Example 1

[0050] See also Figure 1 The present embodiment provides a method for preparing a glass reinforced concrete pipe, comprising:

[0051] S100, preparing concrete materials and composite reinforcement;

[0052] S200, tying the composite reinforcement to obtain a reinforced skeleton;

[0053] S300, placing the reinforcement frame in a designated mold and then pouring concrete material to obtain a glass reinforced concrete pipe;

[0054] Among them, the concrete material includes shale ceramsite, and the mass proportion of shale ceramsite is 27.4% to 30.3%;

[0055] The composite reinforcing bar comprises alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin.

[0056] Specifically, the concrete material in this embodiment uses shale ceramsite instead of stone aggregate, which is mixed with raw materials such as cement to obtain the main material. The weight of the concrete pipe body made of this main material is significantly reduced, and the compressive strength and impermeability of the concrete pipe can be improved.

[0057] Moreover, in this embodiment, the skeleton made of composite reinforcing bars made of alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin replaces the steel skeleton, alleviating the technical problems of low tensile strength, easy corrosion, heavy weight and short service life of ordinary steel bars.

[0058] The glass reinforced concrete pipe made of composite reinforcement and concrete with shale expanded clay as the main material not only improves the compressive strength and impermeability, but also reduces its own weight, thereby reducing the difficulty of transportation and lifting. In addition, it overcomes the technical problem of easy rust of the skeleton after long-term use, ensuring the long-term safety and reliability of the actual project.

[0059] In this embodiment, step S100, the step of preparing concrete material includes:

[0060] S110, premixing shale ceramsite, medium-coarse sand, fly ash, silica fume and cement to obtain a premixed material;

[0061] S120, adding the regulating solution into the ready-mixed material and stirring to obtain a concrete material.

[0062] Specifically, in premixed materials, shale expanded clay can improve the compressive strength of concrete, reduce the weight of concrete materials, and enhance the anti-permeability of concrete.

[0063] The medium sand contained in medium-coarse sand helps to improve the density and strength of concrete, while the coarse sand can provide better skeleton support and reduce the shrinkage and cracks of concrete.

[0064] Fly ash improves the fluidity, cohesion and water retention of concrete mixture.

[0065] Silica fume, also known as microsilica powder, has the functions of retaining water, preventing segregation and water seepage, and reducing concrete transportation resistance in concrete mixing materials.

[0066] Cement hydrates in water to form a colloid, which is used to fill the gaps between aggregates and act as a bond.

[0067] In addition, in this embodiment, the premixing time is 30 seconds.

[0068] In this embodiment, step S120, the step of adding the regulating solution into the premixed material and stirring, comprises:

[0069] S121, adding a set amount of water to the premixed material and stirring for a first time;

[0070] S122, continue to add a set amount of water and a water reducing agent and stir for a second time to obtain a concrete material;

[0071] Among them, the second duration is longer than the first duration.

[0072] Specifically, in this embodiment, the water content is set to 9% to 10.2% of the total weight of the concrete material. The water reducing agent plays a role in reducing the mixing water content and improving the strength of concrete under the condition that the workability of concrete and the amount of cement remain unchanged.

[0073] Furthermore, in this embodiment, the first duration is 1 minute, and the second duration is 2 minutes.

[0074] Specifically, in this embodiment, the concrete material includes:

[0075] 27.4-30.3 parts of shale expanded clay, 32.7-34.1 parts of medium coarse sand, 22.6-23.5 parts of cement, 3.4-3.5 parts of fly ash, 2.3-2.4 parts of silica fume, 9.0-10.2 parts of water, and 0.3-0.5 parts of water reducer.

[0076] In this embodiment, the weight ratio of the medium sand to the coarse sand in the medium coarse sand is 1:2.

[0077] In addition, in this embodiment, the proportion of concrete materials per volume is: cement 440kg / m3, fly ash 66kg / m3, silica fume 44kg / m3, shale ceramsite 551kg / m3, medium coarse sand 663kg / m3, water 177kg / m3, water reducer 5.5kg / m3. Under this proportion, the material strength grade of the prepared concrete body is not less than C50 and the concrete density is less than 2.0×103kg / m3.

[0078] In addition, in this embodiment, the bulk density of the shale ceramsite used is 889.2 kg / m3, the apparent density is 1762.9 kg / m3, the porosity is 49.5%, the mud content is 1.1%, the cylinder pressure strength is 6.56 MPa, and the 1h water absorption rate is 4.1%. The cement is PO 42.5 silicate cement, the water reducer is a polycarboxylic acid high-performance water reducer, the SiO2 content in the silica ash is ≥85.0%, and the fly ash is Class 1 fly ash.

[0079] In this embodiment, step S100, the step of preparing concrete material and composite reinforcement bar further includes:

[0080] S130, combing the alkali-free untwisted glass fiber continuous roving, and then impregnating the roving with liquid unsaturated polyester resin to obtain a liquid-impregnated continuous yarn;

[0081] S140, curing the impregnated continuous yarn to obtain a target composite reinforcement including alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin;

[0082] S150, cutting the target composite reinforcement into a fixed length to obtain a plurality of annular composite reinforcement ribs and a plurality of strip composite reinforcement ribs.

[0083] Specifically, in this embodiment, the composite reinforcement rib is manufactured by a pultrusion process.

[0084] Among them, after the alkali-free untwisted glass fiber continuous roving is drawn out from the creel, it enters the unsaturated polyester resin tank after being combed by the yarn guide device, and the yarn is soaked in resin glue to obtain the liquid-impregnated continuous yarn.

[0085] In addition, the alkali-free untwisted glass fiber continuous roving is the main load-bearing material in the composite reinforcement, accounting for 68 to 75 parts by mass, and the unsaturated polyester resin is the matrix material of the composite reinforcement. Its function is to bond and solidify the glass fiber continuous roving bundles together to form an overall composite material, so that the glass fiber main material can evenly transfer the load when subjected to stress and make the composite reinforcement have excellent corrosion resistance, accounting for 25 to 35 parts by mass.

[0086] It should be noted that, in this embodiment, the diameter of the single fiber of the alkali-free untwisted glass fiber continuous roving is 24 μm, and the breaking strength is 0.35 N / tex. The bending strength of the casting of the unsaturated polyester resin is 128 MPa, and the heat deformation temperature is 78°C.

[0087] Step S140, the step of curing the liquid-impregnated continuous yarn, comprises:

[0088] S141, after removing the bubbles in the interstices of the continuous yarn immersed in the liquid, winding the threads and performing initial curing to obtain a primary composite reinforcement;

[0089] S142, pulling the primary composite reinforcement and solidifying it again to obtain the target composite reinforcement.

[0090] Specifically, in this embodiment, the impregnated continuous yarn is placed in a preforming mold for curing. During the curing process in the preforming mold, bubbles in the gaps between the yarns can be removed.

[0091] Subsequently, a thread machine forms threads on the surface of the yarn processed by the preforming mold, and the yarn with threads is sent into the forming mold for gelation and initial curing to obtain the initial composite reinforcement.

[0092] The preliminary composite reinforcement is continuously pulled out of the mold by a traction machine and further solidified to obtain the target composite reinforcement.

[0093] In this embodiment, step S200, the step of tying the composite reinforcing ribs to obtain a reinforced skeleton, includes:

[0094] S210, arranging a plurality of annular composite reinforcing ribs at intervals along the same direction;

[0095] S220, arranging a plurality of strip-shaped composite reinforcing ribs at intervals along the circumference of the annular composite reinforcing ribs, and tying them one by one with the plurality of annular composite reinforcing ribs respectively, to obtain a reinforced skeleton.

[0096] See also Figure 2 In this embodiment, the reinforcement frame is formed into a cylindrical structure by binding a plurality of annular composite reinforcing ribs and a plurality of strip composite reinforcing ribs.

[0097] In this embodiment, step S300, the steps of placing the reinforcement frame in a designated mold and then pouring concrete material to obtain the glass reinforced concrete pipe include:

[0098] S310, continuously pouring concrete material into the reinforced skeleton in the specified mold until the cast concrete pipe has a specified strength;

[0099] S320, removing the designated mold, sprinkling water to keep moisture, covering and curing the concrete pipe for a designated period of time, and obtaining a glass reinforced concrete pipe.

[0100] In this embodiment, the specified strength is 75% of the concrete strength, and the specified duration is greater than or equal to 14 days.

[0101] Example 2

[0102] The glass reinforced concrete pipe provided in this embodiment is made by the preparation method of a glass reinforced concrete pipe provided in Example 1.

[0103] See also Figure 2 , Figure 3 The skeleton of the glass reinforced concrete pipe in this embodiment is a cylindrical reinforcement skeleton formed by binding a plurality of annular composite reinforcing ribs and a plurality of strip composite reinforcing ribs. The annular composite reinforcing ribs and the strip composite reinforcing ribs are both composed of alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin, and are made by pultrusion molding process.

[0104] Among them, alkali-free untwisted glass fiber continuous roving is the main force-bearing material in the composite reinforcement, accounting for 68 to 75 parts by mass. Unsaturated polyester resin is the matrix material of the composite reinforcement, which is used to bond and solidify the glass fiber continuous roving bundles together to form an overall composite material, so that the glass fiber main material can evenly transfer the load when stressed, and make the composite reinforcement have excellent corrosion resistance, accounting for 25 to 35 parts by mass.

[0105] Concrete materials are poured outside the reinforced skeleton, and the concrete materials include the following components by mass: 27.4-30.3 parts of shale ceramsite, 32.7-34.1 parts of medium-coarse sand, 22.6-23.5 parts of cement, 3.4-3.5 parts of fly ash, 2.3-2.4 parts of silica fume, 9.0-10.2 parts of water, and 0.3-0.5 parts of water reducer.

[0106] The glass reinforced concrete pipe provided in this embodiment is made of a combination of composite reinforcement ribs and concrete with shale ceramsite as the main material. While improving the compressive strength and impermeability, it reduces its own weight, thereby reducing the difficulty of transportation and lifting. In addition, it overcomes the technical problem of easy rust of the skeleton after long-term use, thereby ensuring the long-term safety and reliability of the actual project.

[0107] It should be noted that the shape of the glass reinforced concrete pipe in this embodiment is not limited to the cylindrical structure, but can also be other structures such as square cylinder and conical cylinder. It can also be prepared by the preparation method of the glass reinforced concrete pipe provided in Example 1. Different adaptive skeleton structures are tied according to different structures. After being combined with concrete materials, it can also have the same technical effect as the glass reinforced concrete pipe in this embodiment.

[0108] In addition, the preparation method of the glass reinforced concrete pipe provided in Example 1 can also be used to prepare other forms of building supplies such as beams, frames or plates, which can also have the same technical effects as the glass reinforced concrete pipe in this example.

[0109] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0110] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0111] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0112] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for preparing a glass reinforced concrete pipe, characterized in that: include: preparing concrete materials and composite reinforcements; Binding the composite reinforcing ribs to obtain a reinforced skeleton; Placing the reinforcement frame in a designated mold and then pouring the concrete material to obtain a glass reinforced concrete pipe; Wherein, the concrete material includes shale ceramsite, and the mass proportion of the shale ceramsite is 27.4% to 30.3%; The composite reinforcing rib comprises alkali-free untwisted glass fiber continuous roving and unsaturated polyester resin.

2. The method according to claim 1, characterized in that The step of preparing the concrete material comprises: Premixing shale ceramsite, medium-coarse sand, fly ash, silica fume and cement to obtain a premixed material; The adjusting solution is added into the premixed material and stirred to obtain the concrete material.

3. The method according to claim 2, characterized in that The step of adding the regulating solution into the premixed material and stirring comprises: Adding a set amount of water to the premixed material and stirring for a first time period; Continue to add the set amount of water and the water reducing agent again and stir for a second time to obtain the concrete material; The second duration is greater than the first duration.

4. The method according to claim 3, characterized in that The concrete material includes: 27.4-30.3 parts of shale expanded clay, 32.7-34.1 parts of medium coarse sand, 22.6-23.5 parts of cement, 3.4-3.5 parts of fly ash, 2.3-2.4 parts of silica fume, 9.0-10.2 parts of water, and 0.3-0.5 parts of water reducer.

5. The method according to claim 4, characterized in that In the medium-coarse sand, the weight ratio of the medium sand to the coarse sand is 1:

2.

6. The method according to claim 1, characterized in that The steps of preparing the concrete material and the composite reinforcement bar include: After combing the alkali-free untwisted glass fiber continuous roving, the roving is impregnated with the liquid unsaturated polyester resin to obtain a liquid-impregnated continuous yarn; curing the impregnated continuous yarn to obtain a target composite reinforcement including alkali-free untwisted glass fiber continuous roving and the unsaturated polyester resin; The target composite reinforcement is cut into fixed lengths to obtain a plurality of annular composite reinforcements and a plurality of strip composite reinforcements.

7. The method according to claim 6, characterized in that The step of curing the liquid-impregnated continuous yarn comprises: After the bubbles in the interstices of the impregnated continuous yarn are removed, the threads are wound and initially cured to obtain a primary composite reinforcement; The initially prepared composite reinforcement is pulled and solidified again to obtain the target composite reinforcement.

8. The method according to claim 6, characterized in that The step of tying the composite reinforcing ribs to obtain a reinforced skeleton comprises: Arrange a plurality of the annular composite reinforcing ribs at intervals along the same direction; The plurality of strip-shaped composite reinforcing ribs are arranged at intervals along the circumference of the annular composite reinforcing ribs, and are respectively tied one by one with the plurality of annular composite reinforcing ribs to obtain a reinforced skeleton.

9. The method according to claim 1, characterized in that: The step of placing the reinforcement frame in a designated mold and then pouring the concrete material to obtain a glass reinforced concrete pipe comprises: Continuously pouring the concrete material into the reinforced skeleton in the designated mold until the cast concrete pipe has a designated strength; The designated mold is removed, and the concrete pipe is covered and cured for a designated period of time by sprinkling water to keep it moist, so as to obtain the glass reinforced concrete pipe.

10. A glass reinforced concrete pipe, characterized in that: Made by the method according to any one of claims 1 to 9.

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