CN102691831A - Sand pipe - Google Patents

Abstract

A sand pipe comprises an inside liner, an inner annular winding layer, an inner axial fiber layer, a sand sandwich layer, an outer axial fiber layer, an outer annular winding layer and an outer protection layer from the interior to the exterior sequentially. The inner axial fiber layer and the outer axial fiber layer are both formed by winding glass fiber winding yarn annularly; and the glass fiber winding yarn comprises 25 to 35 wt% of resin. According to the invention, a reciprocating crossed winding layer, which impacts the outer diameter uniformity of a pipeline and has low axial providing strength, is eliminated; and the independent annular winding layers and axial fiber layers are designed, so as to effectively improve the axial strength of the pipeline.

Description

A kind of RPM

Technical field

The present invention relates to the GRP pipe field, especially, relate to a kind of RPM.

Background technique

Existing fixed length fw frp pipeline is that pipe end bell and spigot joint and pipe structure are that reciprocal winding of spiral intersection and hoop twine the structure that adds burning into sand, and the winding of spiral intersection provides the axial and hoop of pipeline, and the hoop winding only provides hoop.Because being spirally wound on pipe ends exists accelerating and decelerating part and stop segment, can cause the two ends of pipeline and accelerating and decelerating part to form non-homogeneous thickened area, causes the pipeline outer wall irregularity.This requires every pipeline all must carry out polishing correction in a big way, and this not only takes a lot of work, time-consuming, and the body external diameter is difficult to be consistent.In addition; Reciprocating type intersection winding technology adopts the interrupted mode of production (pipeline needs one produces) to carry out; The automaticity that raw material add is lower; This causes tube performance unstable, and the performance dispersion ratio is big, axial compression strength is lower, in the product installation process, occurs the damage phenomenon easily.Moreover this kind structure is in large diameter pipeline production and design, because the pipeline mould is that the bellmouth diameter is big; And connect necessary pipeline band bellmouth; And spiral intersect to twine the inevitable accelerating and decelerating part (angle changes section) that when reverse, requires have, and is prone to sliding yarn at two ends, causes the two ends quality to be difficult for guaranteeing; And for the short pipeline of length; Particularly length is less than the pipeline of 1 times of diameter length, can not produce and the sliding yarn in two ends serious, in addition in high pressure pipeline field because the reducer that the vary in diameter of bellmouth forms also is the weak spot that pipeline lost efficacy.

Summary of the invention

The objective of the invention is in order to overcome the deficiency of existing technology; A kind of RPM is provided,, can reduces production costs to improve the intensity and the toughness of pipeline; Reach energy conservation and environment protection; And be under the situation of non-good quartz sand graduation or lower resin content in the burning into sand layer, guarantee the performance fraction of resin mortar layer, improve the intensity of glass fiber reinforced plastic sand-inclusion pipeline.

The object of the invention can take following method to realize:

A kind of RPM; Comprise inside liner, interior hoop winding layer, interior axial direction fibre layer, burning into sand layer, outer axially layer of fibers, outer hoop winding layer and external protection from inside to outside successively, said interior axial direction fibre layer and said outer axially layer of fibers process by the mode that hoop twines.Preferably, said burning into sand layer makes through following steps:

(1) nano silicon and/or nm-class active calcium carbonate are mixed with resin dispersion, obtain the modified resin matrix, wherein the weight ratio of nano silicon and/or nm-class active calcium carbonate is 1-8%;

(2) said modified resin matrix and silica sand are mixed, wherein, weight resin is than being 15-18%.

Preferably, the dispersing and mixing in the said step (1) may further comprise the steps:

A, adopt stirrer tentatively to mix nano silicon and/or nano-calcium carbonate and resin;

B, the mixture that will tentatively mix carry out secondary with the vacuum stirring device and disperse.

Preferably, the particle diameter of said nano silicon and/or nm-class active calcium carbonate is less than 50nm.

Preferably, inside liner is that the surperficial felt of 70-92% is cut felt and formed with short by the weight resin percentage composition.

Preferably, the grain composition of said silica sand is pressed following proportioning:

Particle size range is 10 orders-20 a purpose quartz sand particle, and the quality accounting is 45%;

Particle size range is 30 orders-60 a purpose quartz sand particle, and the quality accounting is 15%;

Particle size range is 70 orders-80 a purpose quartz sand particle, and the quality accounting is 15%;

Particle size range is greater than 90 purpose quartz sand particles, and the quality accounting is 25%.

Because the present invention has adopted above-mentioned technical measures; Make its contrast existing technology that following advantage arranged: the present invention has cancelled to be influenced the pipeline outer diameter uniformity and axial strength and provides inefficient toward the multiple chiasma winding layer, has designed independently hoop winding layer and axial direction fibre layer.Wherein, The axial direction fibre layer (adopts axial chopped strand for small-bore pipeline by axial chopped strand (length of staple 50mm) or axial glasscloth; Large-diameter pipeline adopts axial glasscloth) form through hoop canoe layout, effectively promoted pipeline axial intensity.In addition; The axial strength of pipe structure has the axial direction fibre layer of hoop canoe processing to provide; Axial strength provide efficient high (intensity of fiber direction is high), forming method is simple, adopts the hoop canoe; Avoided problem such as two-end thickness that the spiral intersection is twined to pile up, slided yarn and provide axial strength inefficient shortcoming.The rigidity efficient of pipe structure is high, and high strength and modulus hoop winding layer internal layer and skin are arranged in structural outside layers, and rigidity efficient is high.

Description of drawings

Fig. 1 is the structural representation of RPM of the present invention.

Embodiment

Describe implementation of the present invention in detail below in conjunction with embodiment.

Nano modification RPM of the present invention is made up of 7 layers of structure, is respectively inside liner 1, interior hoop winding layer 2, interior axial direction fibre layer 3, burning into sand layer 4 (being nano modification resin mortar layer), outer axially layer of fibers 5, outer hoop winding layer 6, external protection 7 compositions.

Wherein, inside liner 1: the effect of this layer be guarantee RPM can be safely under certain pressure conveying material normally, make the work of product long-term stability.This layer is cut felt and is formed with short by the surperficial felt of high resin content (resin content is at 70-92%), has characteristics such as wear-resisting, corrosion-resistant, leakage proof.

Interior hoop winding layer 2 and outer hoop winding layer 6: this is two-layer to be the bearing bed of RPM, and it has guaranteed hoop tensile strength, hoop flexural strength and the rigidity of pipe.This is two-layer to twine yarn continuously by high-intensity glass fibre, adopts the mode that hoop twines to process, and its resin content is between 25-35% weight.

Interior axial direction fibre layer 3 and outer axially layer of fibers 5: this is two-layer to be the bearing bed of RPM, and it has guaranteed the axial tensile strength and the axial rigidity of pipe.This is two-layer by short axial direction fibre or the axial direction fibre fabric cut, and adopts the mode of hoop winding to process, and its resin content is between 45-65% weight.

Burning into sand layer 4: this layer is the bearing bed of RPM, is arranged near the neutrosphere of pipe, and main effect provides the axial compression strength and the toughness of pipe.It constitutes the sandwich sandwich structure with high-intensity glass fibre layer, and riser hoop flexural rigidity increases the tubular loading ability.This layer by double-component nanometer material (surface treated nano silicon and the nm-class active calcium carbonate mixture) dispersing and mixing of 1-8% weight in resin; Obtain mixing nano-material modified resin matrix; Again this resin matrix and silica sand are forced to mix forming, its resin content is between 15-18% weight.

External protection 7: this layer is the external protection coating of RPM, has good corrosion-resistant, abrasion resistance properties.This layer is made up of pure resin and high-intensity chopped strand, and its resin content is between 70-100% weight.

Show through the laboratory research test; Adopt the resin of high tenacity and high tenacity; Such as epoxy polyamide cured resin or vinyl ester resins; The resin mortar compression strength that can under the situation of the resin content of 15-18%, satisfy general quartz sand graduation (like 20 orders-40 order accounting 100%) is higher than 75Mpa, but the main problem that exists is that above-mentioned resin price is high, and it is under the condition of high corrosion resistant or other specific (special) requirements and could uses.

Silica sand through to the variable grain diameter carries out the composite of different proportion; The influence of level pairing compression strength that silica sand is described is bigger; The intensity of the silica sand resin mortar of the strength ratio poor grain size distribution of the silica sand resin mortar of good grating exceeds more than 30%, and test result shows that the compression strength that adopts under the following grain composition can meet the demands:

Particle size range	Quality accounting %
		10 orders-20 order	45％
30 orders-60 order	15％
		70 orders-80 order	15％
＞90 orders	25％
		Add up to	100％

But the grating of silica sand must size particles dispose respectively, and must have part intermediate particle diameter to want cancel all.And silica sand supplier is to the instability that is mixed of silica sand, be transportation with produce in occur particle diameter easily and separate.Find that through the burning into sand layer of released part pipeline its grain composition is not predefined grating, material mixing is also inhomogeneous simultaneously, causes push pipe intensity dispersion big.Through detection, the product that same batch of material is produced, the peak of its compression strength and minimum can differ more than one times.

Below be that different resins mixture and silica sand mix the push pipe compression strength comparative trial that the back forms the burning into sand layer:

(1) resin is 15 parts

85 parts of silica sands: 20-40 order

Push pipe compression strength: 44.51Mpa

(2) resin is 25 parts

75 parts of silica sands: 20-40 order

Push pipe compression strength: 66.86Mpa

(3) the nano modification resin compound is 15 parts

85 parts of silica sands: 20-40 order

Push pipe compression strength: 82.61Mpa

What be worth explanation is that the RPM among the present invention not only can be used as push pipe, can also wait other pipelines as the excavation pipe.

Claims (6)

1. RPM; Comprise inside liner, interior hoop winding layer, interior axial direction fibre layer, burning into sand layer, outer axially layer of fibers, outer hoop winding layer and external protection from inside to outside successively, it is characterized in that: axial direction fibre layer and said outer axially layer of fibers process by the mode that hoop twines in said.

2. RPM according to claim 1 is characterized in that said burning into sand layer makes through following steps:

(1) nano silicon and/or nm-class active calcium carbonate are mixed with resin dispersion, obtain the modified resin matrix, wherein the weight ratio of nano silicon and/or nm-class active calcium carbonate is 1-8%;

(2) said modified resin matrix and silica sand are mixed, wherein, weight resin is than being 15-18%.

3. RPM according to claim 1 and 2 is characterized in that the dispersing and mixing in the said step (1) may further comprise the steps:

A, adopt stirrer tentatively to mix nano silicon and/or nano-calcium carbonate and resin;

B, the mixture that will tentatively mix carry out secondary with the vacuum stirring device and disperse.

4. according to the arbitrary described RPM of claim 1-3, the particle diameter that it is characterized in that said nano silicon and/or nm-class active calcium carbonate is less than 50nm.

5. according to the arbitrary described RPM of claim 1-4, it is characterized in that inside liner is that the surperficial felt of 70-92% is cut felt and formed with short by the weight resin percentage composition.

6. according to the arbitrary described RPM of claim 2-5, the grain composition that it is characterized in that said silica sand is by following proportioning:

Particle size range is 10 orders-20 a purpose quartz sand particle, and the quality accounting is 45%;

Particle size range is 30 orders-60 a purpose quartz sand particle, and the quality accounting is 15%;

Particle size range is 70 orders-80 a purpose quartz sand particle, and the quality accounting is 15%;

Particle size range is greater than 90 purpose quartz sand particles, and the quality accounting is 25%.

Images