CN111575866B

CN111575866B - Preparation method of reinforced cement-based concrete splicing-free woven pipe

Info

Publication number: CN111575866B
Application number: CN202010453945.4A
Authority: CN
Inventors: 王海楼; 张伟; 魏发云; 杨帆; 张瑜
Original assignee: Nantong University
Current assignee: Nantong University
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2022-04-01
Anticipated expiration: 2040-05-26
Also published as: CN111575866A

Abstract

The invention discloses a preparation method of reinforced cement-based concrete splicing-free woven pipe, which comprises the following steps: A. selecting a fiber raw material for preparing a concrete woven tube; B. based on a special weave structure, arranging warps according to a specific rule, and continuously feeding wefts in a shuttle mode; C. the tubular fabric with uniform axial and circumferential structures is prepared according to a specific interweaving rule, the tubular fabric can be prepared by adopting single weft yarns, has uniform integral structure, strong designability, corrosion resistance and light weight, can be used for enhancing the axial tensile and compression resistance of the integral structure of cement-based concrete, improving the tensile and compression strength, reducing the compression shear damage, avoiding integral sudden brittle fracture, contributing to improving the safety coefficient of related projects, reducing the brittle damage of the cement-based concrete and also can be used for preparing cement-based concrete structural members.

Description

Preparation method of reinforced cement-based concrete splicing-free woven pipe

Technical Field

The invention relates to the technical field of reinforced cement-based concrete splicing-free woven pipes, in particular to a preparation method of a reinforced cement-based concrete splicing-free woven pipe.

Background

The cement-based concrete is an important traffic and building material, is an indispensable basic material in infrastructure, and is widely used for various civil engineering and security engineering. However, it should be noted that although the cement-based concrete has good compression resistance, it is brittle, and is prone to sudden cracking and failure, and the tensile, bending and shear properties are weak, which limits the mechanical properties and safety factors of related engineering to some extent, so that some special means are required to enhance the mechanical properties of the cement-based concrete.

Information on reinforced cement-based concrete is found in published chinese patent documents, such as patent No. CN106639493A, where a stainless steel rebar structure is used to reinforce a concrete cylinder. Such as a reinforced concrete column using a steel reinforcement cage in patent No. CN 103726613A. For example, patent No. CN108314364A provides a polypropylene fiber fabric concrete and a preparation method thereof, which uses fragments of waste polypropylene fiber fabric to improve the toughness of the concrete. The steel bar structure has heavy weight and is easy to corrode; the two-dimensional plane fabric structure lacks the wholeness, and is limited to the mechanical properties reinforcing of concrete.

Therefore, in order to satisfy the product diversity and effectively reinforce cement-based concrete, as a person skilled in the art, a structural material for reinforcing cement-based concrete, which is corrosion-resistant, light and good in integrity, needs to be designed to increase the selectivity of a reinforcement body and provide a more appropriate reinforcing material for some engineering applications.

Disclosure of Invention

The invention aims to provide a method for preparing a reinforced cement-based concrete splicing-free woven pipe, which has uniform and complete axial and circumferential organizational structures, does not have obvious splicing phenomenon, can adopt single weft yarns to realize the preparation of tubular fabrics, has uniform integral structure, strong designability, corrosion resistance and light weight, can be used for enhancing the axial tension and compression resistance of the integral structure of cement-based concrete, improving the tension and compression strength of the integral structure, reducing the compression and shearing damage, avoiding integral sudden brittle fracture, contributing to improving the safety coefficient of related projects and reducing the brittle fracture of the cement-based concrete, and solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of reinforced cement-based concrete splicing-free woven pipe comprises the following steps:

A. selecting a fiber raw material for preparing a concrete woven tube;

B. based on a special weave structure, arranging warps according to a specific rule, and continuously feeding wefts in a shuttle mode;

C. according to a specific interleaving rule.

Preferably, the coarse denier high-modulus filaments are selected as fiber raw materials according to the step A, warp yarns are arranged according to a specific rule based on a special tissue structure, the total number of the warp yarns meets the requirement that the integral number of the tissue cycle is less than one, weft yarns are continuously fed in a shuttle mode, and the tubular fabric with uniform axial and circumferential structures is prepared according to a specific interweaving rule.

Preferably, the weave structure comprises N rows of warp yarns and M rows of weft yarns, the last row of weave points (M) of each row being identical to the first row of weave points (M') of the following row, and the last row of weave points (E) of the last row of weave structures being identical to the first row of weave points (S).

Preferably, it is characterized in that: the above-mentioned

a. The arrangement rule requires that the total number of warp yarns is one less (2 XPXN-1) than the integer number of the weave cycles;

b. dividing the warps into two groups (A group and B group) with the number difference not exceeding the number of the weaving cycles (N), wherein the number of the warps of the A group is the integer number of the weaving cycles (P multiplied by N), and the number of the warps of the B group is one less integer number of the weaving cycles (P multiplied by N-1);

c. the warp yarns of group a alternate with the warp yarns of group B, with group a being arranged in a positive sequence in the weave order (1 → 2 → 3 → 4) and group B being arranged in a negative sequence in the weave order (4 → 3 → 2 → 1), with the last (4) of the weave pattern missing in the first warp yarn arrangement of group B (3 → 2 → 1).

d. Continuously feeding weft yarns in a shuttle mode, and feeding the weft yarns according to the following steps: (a) interweaving the warp yarns of the group A to the other end of the weft yarns from one end of a weft yarn feeding position in sequence; (b) then interweaving with the group B warp yarns from the other end back in sequence; interweaving according to the reciprocating of (a) and (b). In the process of interweaving the weft yarns with the groups A and B, all the groups A are located above the weft yarns under the condition of not participating in interweaving, and all the groups B are located below the weft yarns under the condition of not participating in interweaving.

Preferably, the fiber raw material is a coarse denier high-modulus PVA, POM and PP filament.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the preparation method of the reinforced cement-based concrete splice-free woven pipe, the axial and circumferential tissue structures are uniform and complete, no obvious splicing phenomenon exists, the preparation of tubular fabrics can be realized by adopting single weft yarns, the overall structure is uniform, designability is strong, corrosion resistance and light weight are achieved, the preparation method can be used for enhancing the axial tensile and compression resistance of the overall structure of cement-based concrete, improving the tensile and compression strength of the overall structure, reducing pressure shear damage, avoiding integral sudden brittle fracture, being beneficial to improving the safety coefficient of related engineering, being used for reducing the brittle damage of cement-based concrete and being also used for preparing cement-based concrete structural members;

(2) the product of the invention has flexible form change and strong adaptability, and has great application potential in the industries of roads, houses, bridges and the like relating to cement-based concrete.

Drawings

FIG. 1 is a schematic representation of a particular type of organization of the present invention;

FIG. 2 is a schematic diagram of the warp yarn arrangement of the present invention;

FIG. 3 is a schematic diagram of the basic weave structure, warp yarn arrangement, and interlacing principle of an embodiment of the present invention;

FIG. 4 is a diagram illustrating the effect of the embodiment of the present invention;

FIG. 5 is a side view of an embodiment of the present invention;

FIG. 6 is a top view of an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: the method is characterized in that coarse denier high-modulus filaments are selected as fiber raw materials, warp yarns are arranged according to a specific rule based on a special organizational structure, weft yarns are continuously fed in a shuttle mode, and an integrally formed tubular fabric is manufactured according to a specific interweaving rule, wherein the axial organizational structure and the circumferential organizational structure of the integrally formed tubular fabric are uniform and complete, and no obvious splicing phenomenon exists.

Wherein, the fiber material is one of thick denier high-modulus PVA, POM and PP filament.

In this embodiment, adopt single woof to realize the preparation of tubular fabric, its axial and circumference organizational structure are even complete, do not have obvious concatenation phenomenon, and overall structure is even moreover, and designability is strong, can be used to the overall structure axial compressive property of reinforcing cement base concrete, improves its compressive strength, alleviates the pressure and cuts the destruction, avoids whole proruption brittle fracture, alleviates the brittle failure of cement base concrete, also can be used to prepare cement base concrete structure, helps improving the factor of safety of relevant engineering.

In this embodiment, the method for preparing the reinforced cement-based concrete splicing-free woven pipe, which is used for preparing the woven pipe with the diameter of 200mm, includes the following steps:

step one, based on the requirement of a special weave structure, the designed basic weave structure comprises 2 rows of warp yarns and 2 rows of weft yarns, the last row of weave points in each row in the weave structure is the same as the first row of weave points in the subsequent row, and the last row of weave points in the last row of weave structure is the same as the first row of weave points in the first row.

Selecting 47 warp yarns as the total number, wherein the integral number of the weave cycles is less than one; dividing the warps into a group A and a group B, wherein the difference of the number of the warps is not more than the number of the warp weave cycles, the number of the warps of the group A is 24, and the number of the warps of the group B is 23 which is one less than the integer number of the weave cycles; the warp yarns of group A are then alternated with the warp yarns of group B, wherein group A is in positive order in the weave order and group B is in negative order in the weave order, wherein the last of the weave patterns is missing in the first warp yarn arrangement of group B.

Wherein, the warp yarns are PVA filaments with the diameter of about 3mm and the modulus of 40 GPa.

And step three, continuously feeding the weft yarns in a shuttle mode, and feeding the weft yarns into the weft yarn feeding position according to the following steps of (a) sequentially interweaving with the group A warp yarns to the other end from one end of the weft yarn feeding position, and (B) sequentially interweaving with the group B warp yarns from the other end back, and then sequentially interweaving in a reciprocating mode according to the steps (a) and (B).

Wherein, the weft yarn is high-modulus POM filament with the diameter of about 3 mm.

Wherein, in the interweaving process of the weft yarn and the A group and the B group, the following requirements are met: firstly, on the premise that the yarns of the group A and the group B are arranged according to respective organization points, the weft yarns are only interwoven with the warp yarns of the group A according to the organization rule in the interweaving process from one end of a weft yarn feeding position to the other end, and then are interwoven with the warp yarns of the group B back to one end of the weft yarn feeding position, so that the alternative interweaving with the group A and the group B is realized, all the group A are positioned above the weft yarns under the condition of not participating in the interweaving, and all the group B are positioned below the weft yarns under the condition of not participating in the interweaving.

Wherein, the interweaving width in the interweaving process is about 314 mm.

In the third step, the weft yarns are continuously interwoven by 240mm along the warp yarn direction, a woven pipe with the diameter of 200mm and the length of 240mm is obtained after the weft yarns are off the machine, and the woven pipe is used for pouring cement-based concrete to form a small cement-based concrete columnar member.

Wherein, the axial and circumferential organizational structures of the woven tube are uniform and complete without obvious splicing phenomenon,

the integrally-formed woven pipe prepared by the embodiment is used for enhancing the axial tensile-compression performance of the integral structure of the cement-based concrete, preventing sudden brittle fracture, improving the compressive strength of the original cement-based concrete from 15MPa to 25MPa, weakening sudden integral brittle fracture and contributing to improving the safety coefficient of related engineering.

In addition, similar to the above-mentioned embodiment, the woven tube with a uniform structure of 200mm diameter can be constructed with different diameters and lengths by changing the number of tissue cycles, the size of the basic tissue and the warp interlacing length.

According to the preparation method of the reinforced cement-based concrete splice-free woven pipe, the axial and circumferential tissue structures are uniform and complete, no obvious splicing phenomenon exists, the preparation of the tubular fabric can be realized by adopting single weft yarns, the overall structure is uniform, designability is strong, corrosion resistance and light weight are achieved, the preparation method can be used for enhancing the axial tensile and compression resistance of the overall structure of the cement-based concrete, the tensile and compression strength is improved, compression shear damage is reduced, integral sudden brittle fracture is avoided, the safety coefficient of related projects is improved, the brittle damage of the cement-based concrete is reduced, and the preparation method can also be used for preparing cement-based concrete structural members.

The product of the invention has flexible form change and strong adaptability, and has great application potential in the industries of roads, houses, bridges and the like relating to cement-based concrete.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A preparation method of reinforced cement-based concrete splicing-free woven pipe is characterized by comprising the following steps: the method comprises the following steps:

selecting thick-denier high-modulus PVA, POM or PP filaments as fiber raw materials, arranging warps according to a specific rule based on a special tissue structure, continuously feeding wefts in a shuttle mode by adopting the total number of the warps which meets the requirement that the integral number of the tissue cycles is less than one, and preparing tubular fabric with uniform axial and circumferential structures according to a specific interweaving rule;

the weave structure comprises N rows of warp yarns and M rows of weft yarns, the last row of weave point (M) of each row in the weave structure is the same as the first row of weave point (M') of the subsequent row, and the last row of weave point (E) of the last row in the weave structure is the same as the first row of weave point (S);

the preparation process comprises the following steps:

a. the arrangement rule requires that the total number of warp yarns is an integer and the number of the weave cycles is one less (2 multiplied by P multiplied by N-1), wherein P is the number of the weave cycles;

c. the warp yarns of group A are arranged alternately with the warp yarns of group B, wherein group A is arranged in a positive sequence (1 → 2 → 3 → 4) and group B is arranged in a negative sequence (4 → 3 → 2 → 1) in the weave order, and wherein the last (4) of the weave pattern is missing in the first warp yarn arrangement (3 → 2 → 1) of group B;

d. continuously feeding weft yarns in a shuttle mode, and feeding the weft yarns according to the following steps: (a) interweaving the warp yarns of the group A to the other end of the weft yarns from one end of a weft yarn feeding position in sequence; (b) then interweaving with the group B warp yarns from the other end back in sequence; interweaving according to (a) and (b); in the process of interweaving the weft yarns with the groups A and B, all the groups A are located above the weft yarns under the condition of not participating in interweaving, and all the groups B are located below the weft yarns under the condition of not participating in interweaving.