CN107057190B - Sleeve for protecting reserved steel bar by isolating concrete - Google Patents
Sleeve for protecting reserved steel bar by isolating concrete Download PDFInfo
- Publication number
- CN107057190B CN107057190B CN201710257847.1A CN201710257847A CN107057190B CN 107057190 B CN107057190 B CN 107057190B CN 201710257847 A CN201710257847 A CN 201710257847A CN 107057190 B CN107057190 B CN 107057190B
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- Prior art keywords
- sleeve
- parts
- steel bar
- antioxidant
- reserved
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/20—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of material other than metal or with only additional metal parts, e.g. concrete or plastics spacers with metal binding wires
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Abstract
The invention discloses a sleeve for protecting a reserved steel bar by isolating concrete. The sleeve comprises the following raw materials in parts by mass: 90-110 parts of PP; 8-15 parts of PE; 5-10 parts of reinforcing fiber; 4-6 parts of a wear-resistant modifier; 8-12 parts of a composite impact modifier; 0.5-1 part of antioxidant; 0.3-0.5 part of light stabilizer; 3-6 parts of a compatilizer; 20-30 parts of composite filler. Also discloses a preparation method of the sleeve for protecting the reserved steel bar by the isolated concrete and also discloses application of the sleeve in the protection of the reserved steel bar. The sleeve has higher hardness, good impact resistance and good aging resistance, and is suitable for protecting the reserved steel bars by isolating concrete; the reserved and embedded steel bars are isolated from the concrete by the sleeve, so that subsequent chiseling and connection are facilitated; the sleeve plays a role in buffering between the steel bars and the concrete, and a gun machine can be used for replacing manual concrete chiseling, so that the labor intensity is reduced; after the sleeve is used, the reserved and embedded steel bars can be prevented from being repeatedly bent, and the steel bars are effectively prevented from being broken.
Description
Technical Field
The invention relates to a sleeve for protecting a reserved steel bar by isolating concrete.
Background
In the current construction, when the reserved and embedded steel bars are encountered, the reserved and embedded steel bars and other structural steel bars are poured together with concrete, no isolation protection measures are taken, so that a large amount of manpower is needed to chisel the reserved and embedded steel bars out again in the subsequent construction process, and the reserved and embedded steel bars are often bent or even broken.
The defects of the prior art mainly comprise: 1. reserved and pre-embedded steel bars are wrapped by concrete, and the chiseling difficulty is high; 2. in the concrete chiseling process, because the reinforcing bar hinders, the workman often will buckle the reinforcing bar, straightens the reinforcing bar again after finishing chiseling, and this process is easy with the reinforcing bar rupture. At present, in the construction field of reserved steel bar protection, a protective sleeve with high hardness, good impact resistance, aging resistance and good comprehensive performance and convenient use needs to be searched urgently.
Disclosure of Invention
The invention aims to provide a sleeve for protecting a reserved steel bar by isolating concrete.
The technical scheme adopted by the invention is as follows:
the sleeve for protecting the reserved steel bars in the isolated concrete comprises the following raw materials in parts by mass:
90-110 parts of PP; 8-15 parts of PE; 5-10 parts of reinforcing fiber; 4-6 parts of a wear-resistant modifier; 8-12 parts of a composite impact modifier; 0.5-1 part of antioxidant; 0.3-0.5 part of light stabilizer; 3-6 parts of a compatilizer; 20-30 parts of composite filler.
The reinforcing fiber is at least one of glass fiber, steel fiber and carbon fiber.
The wear-resistant modifier is at least one of calcium sulfate whisker, magnesium sulfate whisker, zinc oxide whisker, magnesium borate whisker, aluminum borate whisker, calcium carbonate whisker, potassium titanate whisker and silicon carbide whisker.
The composite impact modifier is at least two of CPE, MBS, ABS, ACR and SBS.
The antioxidant is at least one of hindered phenol antioxidant, thioester antioxidant, phosphite antioxidant and composite antioxidant.
The light stabilizer is at least one of benzophenone, benzotriazole, salicylate, benzoate, cyanoacrylate and hindered amine stabilizers.
The compatilizer is at least one of PP-g-MAH and PE-g-MAH.
The composite filler is at least two of talcum powder, calcium carbonate, kaolin, mica powder and barium sulfate.
A method for preparing a sleeve for protecting a reserved steel bar by isolating concrete comprises the steps of weighing raw materials of all components according to a proportion, uniformly mixing, putting the mixture in an extruder, blending, extruding, cooling and shaping.
The sleeve is applied to the protection of the reserved steel bars.
The invention has the beneficial effects that:
1. the sleeve has higher hardness, good impact resistance and good aging resistance, and is suitable for protecting the reserved steel bars by isolating concrete;
2. the sleeve of the invention is used for isolating the reserved and embedded steel bars from the concrete, thereby facilitating the subsequent chiseling and connection;
3. the sleeve plays a role in buffering between the steel bars and concrete, and a gun machine can be used for replacing manual concrete chiseling, so that the labor intensity is reduced;
4. after the sleeve is used, the reserved and embedded steel bars can be prevented from being repeatedly bent, and the steel bars are effectively prevented from being broken.
Drawings
Fig. 1 is a schematic view of the sleeve of the present invention applied to protection of embedded steel bars.
Detailed Description
The sleeve for protecting the reserved steel bars in the isolated concrete comprises the following raw materials in parts by mass:
90-110 parts of PP; 8-15 parts of PE; 5-10 parts of reinforcing fiber; 4-6 parts of a wear-resistant modifier; 8-12 parts of a composite impact modifier; 0.5-1 part of antioxidant; 0.3-0.5 part of light stabilizer; 3-6 parts of a compatilizer; 20-30 parts of composite filler.
Preferably, the PP is one or a mixture of homo-polypropylene and co-polypropylene.
Preferably, the PP is one or two mixtures of low-density polyethylene or high-density polyethylene.
Preferably, the reinforcing fiber is at least one of glass fiber, steel fiber and carbon fiber; further preferably, the reinforcing fibers are glass fibers.
Preferably, the wear-resistant modifier is at least one of calcium sulfate whisker, magnesium sulfate whisker, zinc oxide whisker, magnesium borate whisker, aluminum borate whisker, calcium carbonate whisker, potassium titanate whisker and silicon carbide whisker; more preferably, the wear-resistant modifier is at least one of calcium sulfate whisker, magnesium sulfate whisker, zinc oxide whisker and silicon carbide whisker; still further preferably, the wear-resistant modifier is calcium sulfate whisker.
Preferably, the composite impact modifier is at least two of CPE, MBS, ABS, ACR and SBS; further preferably, the composite impact modifier is any two of MBS, ACR and SBS; still further preferably, the composite impact modifier is ACR and MBS; furthermore, in the composite impact modifier, the mass ratio of ACR to MBS is 1: (1.5-2).
Preferably, the antioxidant is at least one of hindered phenol antioxidant, thioester antioxidant, phosphite antioxidant and composite antioxidant; more preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 168 and antioxidant 1076; still more preferably, the antioxidant is antioxidant 168 and antioxidant 1010; furthermore, in the antioxidant, the mass ratio of the antioxidant 168 to the antioxidant 1010 is 2: 1.
Preferably, the light stabilizer is at least one of benzophenone, benzotriazole, salicylate, benzoate, cyanoacrylate and hindered amine stabilizers; more preferably, the light stabilizer is a benzotriazole stabilizer; still more preferably, the light stabilizer is one of UV-P, UV-234, UV-320, UV-326, UV-327 and UV-328.
Preferably, the compatilizer is at least one of PP-g-MAH and PE-g-MAH; further preferably, the compatilizer is PP-g-MAH.
Preferably, the composite filler is at least two of talcum powder, calcium carbonate, kaolin, mica powder and barium sulfate; further preferably, the composite filler is a mixture of talcum powder and calcium carbonate; furthermore, the mass ratio of the talcum powder to the calcium carbonate in the composite filler is 2: 1.
Preferably, the preparation method of the sleeve for protecting the reserved steel bar by the isolated concrete comprises the steps of weighing the raw materials of the components in proportion, uniformly mixing, putting the mixture into an extruder, blending, extruding, cooling and shaping.
The sleeve is applied to the protection of the reserved steel bars.
The application comprises the following steps:
1) cutting sleeves with the same length according to the length of the reserved steel bar to be protected;
2) sleeving the sleeve on the reserved steel bar, wherein the end of the sleeve is flush with the head of the steel bar;
3) the end of the sleeve is covered tightly by a cap, and the other end of the sleeve is tied tightly by a binding belt.
The cap is made of common plastics in the field, such as polyethylene, polyvinyl chloride, polypropylene and the like.
The binding belt is a plastic belt, an adhesive tape, a steel wire rope or a steel wire.
The steel bar is a standard steel bar material commonly used in construction engineering, and the steel bar with the diameter range of 16-40 mm is preferably selected.
Furthermore, the diameter of the sleeve is 3-4 mm larger than that of the steel bar.
Furthermore, the thickness of the sleeve is 1.2-1.4 mm.
The present invention will be described in further detail with reference to specific examples.
Example (b):
the sleeve raw materials (by mass) and properties prepared by the method are shown in the following table 1:
TABLE 1 casing materials and Properties according to the invention
The analysis method of the aging test is to carry out the thermal aging test in a thermal aging box under the condition that the temperature is 80 ℃ for × 72h, and the other tests are carried out according to the national standard.
The application comprises the following steps:
fig. 1 is a schematic view of the sleeve of the present invention applied to protection of embedded steel bars. With reference to fig. 1, the specific process of the sleeve applied to the protection of the reserved steel bars is as follows:
1. measuring the length of the reserved reinforcing steel bar head to be protected, and shearing the sleeves with the same length by using scissors;
2. sleeving the cut sleeve with the reserved steel bar, wherein the end of the sleeve is flush with the head of the steel bar;
3. the end is covered tightly by a cover cap, and the other end of the sleeve is tied tightly by a plastic tie.
The prepared bushing of the present invention was compared with commercially available PVC-U wire pipes and polyolefin heat shrinkable tubes, and the use of steel bars having a diameter of 32mm was used for comparison, and the results are shown in Table 2.
TABLE 2 comparison of the use effects of different sleeves made of different materials
Claims (1)
1. The application of the sleeve for protecting the reserved steel bar by isolating concrete in the protection of the reserved steel bar comprises the following steps:
1) cutting sleeves with the same length according to the length of the reserved steel bar to be protected;
2) sleeving the sleeve on the reserved steel bar, wherein the end of the sleeve is flush with the head of the steel bar;
3) the end of the sleeve is covered tightly by a cap, and the other end of the sleeve is tied tightly by a binding belt;
the sleeve is prepared from the following raw materials in parts by mass: 90-110 parts of PP; 8-15 parts of PE; 5-10 parts of reinforcing fiber;
4-6 parts of a wear-resistant modifier; 8-12 parts of a composite impact modifier; 0.5-1 part of antioxidant; 0.3-0.5 part of light stabilizer; 3-6 parts of a compatilizer; 20-30 parts of composite filler;
the reinforced fiber is glass fiber;
the wear-resistant modifier is calcium sulfate whisker;
the composite impact modifier comprises ACR and MBS, and the mass ratio of ACR to MBS is 1: (1.5-2);
the antioxidant is antioxidant 168 and antioxidant 1010, and the mass ratio of the antioxidant 168 to the antioxidant 1010 is 2: 1;
the light stabilizer is one of UV-P, UV-326;
the compatilizer is PP-g-MAH;
the composite filler is a mixture of talcum powder and calcium carbonate, and the mass ratio of the talcum powder to the calcium carbonate is 2: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710257847.1A CN107057190B (en) | 2017-04-19 | 2017-04-19 | Sleeve for protecting reserved steel bar by isolating concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710257847.1A CN107057190B (en) | 2017-04-19 | 2017-04-19 | Sleeve for protecting reserved steel bar by isolating concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107057190A CN107057190A (en) | 2017-08-18 |
| CN107057190B true CN107057190B (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710257847.1A Active CN107057190B (en) | 2017-04-19 | 2017-04-19 | Sleeve for protecting reserved steel bar by isolating concrete |
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| CN (1) | CN107057190B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107459709A (en) * | 2017-08-28 | 2017-12-12 | 吴江市金鑫塑料厂 | A kind of high-strength abrasion-proof plastics |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103087388A (en) * | 2013-01-23 | 2013-05-08 | 浙江飞龙管业有限公司 | Reinforced and modified corrugated power protection sleeve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2719264B2 (en) * | 1992-03-13 | 1998-02-25 | 東京瓦斯株式会社 | Double steel pipe for propulsion |
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- 2017-04-19 CN CN201710257847.1A patent/CN107057190B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103087388A (en) * | 2013-01-23 | 2013-05-08 | 浙江飞龙管业有限公司 | Reinforced and modified corrugated power protection sleeve |
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| CN107057190A (en) | 2017-08-18 |
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