CN210508045U

CN210508045U - Unbonded steel strand with flame-retardant function

Info

Publication number: CN210508045U
Application number: CN201921282143.0U
Authority: CN
Inventors: 黄河; 林敬生; 舒彬; 化翔
Original assignee: Traceability (huizhou) Architectural Structure Design Institute (limited Partnership); Qing Yu Tang Strengthening Science And Technology Co ltd
Current assignee: Traceability (huizhou) Architectural Structure Design Institute (limited Partnership); Qing Yu Tang Strengthening Science And Technology Co ltd
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2020-05-12
Anticipated expiration: 2029-08-08

Abstract

The utility model discloses a from unbonded steel strand wires of taking fire-retardant function, include: the steel strand and install the fire-retardant sheath of preventing fires outside the steel strand, the steel strand pencil is formed by a plurality of groups of steel strand combination, it has the undercoating to fill between steel strand pencil and the fire-retardant sheath of preventing fires, the inner wall of the fire-retardant sheath of preventing fires evenly is provided with a plurality of groups of location lugs. The utility model discloses abandoned original steel strand wires crust and adopted high density polyethylene material, through being provided with the fire-retardant sheath of fire prevention, good fire prevention fire-retardant function has been had concurrently, the process has been practiced thrift simultaneously, the convenience is used widely in existing building reinforcement, originally, when unbonded steel strand wires are used for the outside reinforcement of structure, steel strand wires need carry out the fire protection with cement mortar parcel or pea gravel concrete parcel, this is the wet work that needs, it is ann to need the template system, the process is more, the time limit for a project has been saved, after the construction of unbonded steel strand wires from taking the fire prevention function is accomplished, need not wrap up mortar or concrete, can accelerate the engineering progress.

Description

Unbonded steel strand with flame-retardant function

Technical Field

The utility model relates to a construction equipment technical field specifically is a from unbonded steel strand wires of taking fire-retardant function.

Background

The unbonded prestressed steel strand is mainly applied to post-tensioning construction of a prestressed structure, wherein unbonded means that after the prestressed steel strand applies prestress, no adhesive force exists between the prestressed steel strand and a reserved hole in a concrete member, the prestressed steel strand can slide, the prestress is completely transmitted by anchorage devices at two ends, in order to ensure that no adhesive force exists between the prestressed steel strand and the reserved hole in the concrete member, the unbonded steel strand structure consists of a PC (polycarbonate) steel strand, an inner coating (grease or wax), and a HDPE (high density polyethylene) sheath, the HDPE (high density polyethylene) is an inflammable substance, and in the prestressed structure adopting the steel strand, the steel strand (bundle) is a key bearing member, and the corrosion resistance and the fire resistance of the steel strand are directly related to the durability and the safety of the structure.

In the past, steel strands are mainly buried in a concrete structure in a post-tensioning project, people only need to pay attention to the corrosion resistance of the steel strands, but along with the arrival of the post-construction market, more and more old building structures are aged, the bearing capacity does not meet the specifications and the use requirements, designers can design and adopt an external unbonded prestress reinforcing method to reinforce the building structures, at the moment, the fireproof performance of the steel strands cannot be ignored, the existing unbonded steel strand structures are PC steel strands, an internal coating (grease or wax) + an HDPE (high-density polyethylene) sheath, the grease and the wax are combustible materials, the HDPE (high-density polyethylene) is also a combustible material, and if a fire disaster occurs, the building structures can be quickly damaged to harm the life and property safety of people.

The conventional device has the following disadvantages: in the prior art, steel strands on the market do not have the fireproof and flame-retardant functions, so that the overall use safety is greatly reduced, and if a fire disaster happens, the building structure can quickly destroy the life and property safety of people, and the building structure has great danger.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a from unbonded steel strand wires of taking fire-retardant function to the solution problem.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a from unbonded steel strand wires of taking fire-retardant function, includes: the steel strand and install the fire-retardant sheath of fire prevention outside the steel strand, the steel strand pencil is formed by a plurality of groups steel strand wires combination, it has the undercoating to fill between steel strand pencil and the fire-retardant sheath of fire prevention, the inner wall of the fire-retardant sheath of fire prevention evenly is provided with a plurality of groups location lug, and a plurality of groups location lug and undercoating laminating.

Preferably, the steel strand bundle is twisted by 7 groups of single steel strands, and the steel strands are attached to each other.

Preferably, the inner coating is special grease or wax, and the inner coating is attached to the outer portion of the steel strand bundle.

Preferably, the fireproof flame-retardant sheath is formed by combining high-strength fireproof and anticorrosive materials, and the high-strength fireproof and anticorrosive materials are non-combustible and have super-strong anticorrosive performance.

Preferably, the plurality of groups of positioning lugs are uniformly arranged on the inner wall of the fireproof flame-retardant sheath, and the whole positioning lugs are of a semicircular structure.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses an install fire prevention fire-retardant sheath in steel strand bundle outside, abandoned original steel strand wires crust to adopt high density polyethylene material, had both good fire prevention fire-retardant function, had good result of use, widened the nonbonding steel strand wires application prospect, and this steel strand wires later stage does not basically need the maintenance, has practiced thrift use cost;

2. the utility model discloses simultaneously effectual process of having practiced thrift, convenient using widely in existing building reinforcement, original unbonded steel strand wires need carry out fire protection with cement mortar parcel or pea gravel concrete parcel when being used for the outside reinforcement of structure, and this is the wet operation of needs, needs template system ann, and the process is more, has saved the time limit for a project, and the back is accomplished in the construction of the unbonded steel strand wires of taking the fire prevention function from area, does not need parcel mortar or concrete, can accelerate the engineering progress.

Drawings

FIG. 1 is a schematic view of an integral structure of a unbonded steel strand with a flame retardant function;

fig. 2 is a schematic view of the connection between the unbonded steel strand positioning bump with flame retardant function and the fireproof flame retardant sheath.

In the figure: 1. steel strand wires; 2. a fireproof flame-retardant sheath; 3. inner coating; 4. and positioning the projection.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a from unbonded steel strand wires of taking fire-retardant function, includes: steel strand wires restraints and installs fire prevention fire-retardant sheath 2 outside steel strand wires, the steel strand wires is restrainted and is formed by the combination of a plurality of groups steel strand wires 1, it has undercoating 3 to fill between steel strand wires and the fire prevention fire-retardant sheath 2, the inner wall of the fire prevention fire-retardant sheath 2 evenly is provided with a plurality of groups location lug 4, and a plurality of groups location lug 4 and the laminating of undercoating 3.

The steel strand bundle is twisted by 7 groups of single steel strands 1, and the steel strands 1 are attached to each other.

The inner coating 3 is special grease or wax, and the inner coating 3 is attached to the outer portion of the steel strand bundle.

The fireproof flame-retardant sheath 2 is formed by combining high-strength fireproof anticorrosive materials, and the high-strength fireproof anticorrosive materials are non-combustible and have super-strong anticorrosive performance.

The plurality of groups of positioning convex blocks 4 are uniformly arranged on the inner wall of the fireproof flame-retardant sheath 2, and the whole positioning convex blocks 4 are of a semicircular structure.

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. The utility model provides a from unbonded steel strand wires of taking fire-retardant function which characterized in that includes: the steel strand bundle and install fire prevention fire-retardant sheath (2) outside the steel strand bundle, the steel strand bundle is formed by a plurality of groups steel strand wires (1) combination, it has undercoating (3) to fill between steel strand bundle and the fire prevention fire-retardant sheath (2), the inner wall of the fire prevention fire-retardant sheath (2) evenly is provided with a plurality of groups location lug (4), and a plurality of groups location lug (4) and undercoating (3) laminating.

2. The unbonded steel strand with the flame retardant function as claimed in claim 1, wherein: the steel strand bundle is twisted by 7 groups of single steel strands (1), and the steel strands (1) are attached to each other.

3. The unbonded steel strand with the flame retardant function as claimed in claim 1, wherein: the inner coating (3) is special grease or wax, and the inner coating (3) is attached to the outer portion of the steel strand bundle.

4. The unbonded steel strand with the flame retardant function as claimed in claim 1, wherein: the fireproof flame-retardant sheath (2) is formed by combining high-strength fireproof and anticorrosive materials, and the high-strength fireproof and anticorrosive materials are non-combustible and have super-strong anticorrosive performance.

5. The unbonded steel strand with the flame retardant function as claimed in claim 1, wherein: the positioning lugs (4) are uniformly arranged on the inner wall of the fireproof flame-retardant sheath (2), and the whole positioning lugs (4) are of a semicircular structure.