CN113756178A - High-strength corrugated pipe for prestressed concrete - Google Patents
High-strength corrugated pipe for prestressed concrete Download PDFInfo
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- CN113756178A CN113756178A CN202110986575.5A CN202110986575A CN113756178A CN 113756178 A CN113756178 A CN 113756178A CN 202110986575 A CN202110986575 A CN 202110986575A CN 113756178 A CN113756178 A CN 113756178A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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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
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/10—Ducts
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
- E01D2101/285—Composite prestressed concrete-metal
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/40—Plastics
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention relates to a high-strength corrugated pipe for prestressed concrete, which comprises a plastic inner pipe, a support belt spirally wound on the plastic inner pipe, and a steel-plastic composite belt wrapped on the support belt and the plastic inner pipe; the support band is including being fixed in the apex angle strip and a pair of winding of steel-plastic composite band inner wall are located end angle strip on the plastics inner tube, be fixed in the billet on apex angle strip and this pair of end angle strip, the billet is in form through buckling many times between end angle strip and the apex angle strip. The invention adopts the mode of combining the plastic inner pipe with the steel-plastic composite belt, and the supporting belt with optimized structure is used for filling and supporting, so that the bonding strength between the corrugated pipe and concrete after being installed can be improved while the corrugated hardness and the contact area are enhanced, the rigidity of the corrugated pipe can be integrally enhanced, and the use requirements in the field of concrete infrastructure such as bridges, large-span buildings and the like can be met.
Description
Technical Field
The invention relates to the technical field of corrugated pipes, in particular to a high-strength corrugated pipe for prestressed concrete.
Background
Bridges such as a large-span cast-in-place continuous beam bridge or a continuous rigid frame bridge are generally connected with a main bridge structure through a post-pouring closure section. The closure section is a prestressed member, and concrete is poured firstly and then prestressed reinforcement tensioning is carried out, so that a corrugated pipe needs to be installed before concrete pouring to form a post-tensioned prestressed duct, and a plastic corrugated pipe or a metal corrugated pipe is usually used. When the corrugated pipe is used as a prestressed duct, the theoretical procedures are as follows: installing corrugated pipe → pouring concrete → penetrating prestressed reinforcement → tensioning → grouting corrugated pipe. However, the existing prestressed plastic corrugated pipe is processed by single high-density polyethylene, has single performance, has defects in the aspects of rigidity, toughness, dimensional stability, tensile strength and the like, is relatively light, and is easy to float during the concrete pouring process.
The patent publication No. CN201473874U discloses a prestressed plastic-steel corrugated pipe for a bridge, which comprises a pipe body, wherein the pipe wall of the pipe body is provided with inward-concave and outward-convex spiral or annular ripples at equal intervals, the pipe body comprises an inner layer steel pipe, and the outer surface of the inner layer steel pipe is provided with a plastic layer in a compounding manner.
The above prior art solutions have the following drawbacks: the ripple and the ripples interval of above-mentioned heliciform helicitic texture's bellows are little, and area of contact is little, can influence the bonding strength between the bellows outside and the concrete like this, and then cause the bellows to drag the bridge member because of the tensile force and cause the damage of bellows, simultaneously, although above-mentioned bellows strengthens the ripple hardness through the mode that increases the screw thread at the inner wall, nevertheless can make bellows whole rigidity not enough so on the contrary, and then causes the bellows to cause the bellows fracture because of the bending force is used for bridge member. Therefore, the plastic corrugated pipe needs to be improved so as to have the advantages of high strength and stable performance, and can meet the use requirements in the field of concrete foundation construction such as bridges and large-span buildings.
Disclosure of Invention
The present invention is directed to provide a high strength corrugated pipe for prestressed concrete, which has the advantages of high strength and stable performance, and avoids damage caused by tensile and bending forces, in view of the above-mentioned disadvantages of the prior art.
The above object of the present invention is achieved by the following technical solutions:
a high-strength corrugated pipe for prestressed concrete comprises a plastic inner pipe, a support belt spirally wound on the plastic inner pipe, and a steel-plastic composite belt wrapped on the support belt and the plastic inner pipe; the support band is including being fixed in the apex angle strip and a pair of winding of steel-plastic composite band inner wall are located end angle strip on the plastics inner tube, be fixed in the billet on apex angle strip and this pair of end angle strip, the billet is in form through buckling many times between end angle strip and the apex angle strip.
By adopting the technical scheme, the original mode that the outer steel pipe is combined with the inner steel-plastic composite pipe is changed into the mode that the inner plastic pipe is combined with the steel-plastic composite belt, and the support belt is used for filling and supporting the inner steel-plastic composite belt, so that the ring stiffness of the corrugated pipe can be improved while the corrugated hardness and the contact area are enhanced, and the bonding strength between the corrugated pipe and concrete after the corrugated pipe is installed is ensured; in addition, the structure of the supporting belt is optimized, so that the top angle strip and the pair of bottom angle strips are abutted and fixed on the steel-plastic composite belt, a triangular supporting structure can be formed by connecting two adjacent sections of the steel strip and the top angle strip and/or the bottom angle strip, and when stretching and bending forces act on the corrugated pipe, the structure can uniformly transmit and disperse the stress of the corrugated pipe and has a better stress effect; in conclusion, the mode that the plastic inner pipe is combined with the steel-plastic composite belt is adopted, and the supporting belt after structure optimization is used for filling and supporting, so that the corrugated hardness and the contact area are enhanced, the bonding strength between the corrugated pipe and concrete after installation can be improved, the rigidity of the corrugated pipe can be integrally enhanced, and the use requirements in the field of concrete infrastructure such as bridges and large-span buildings can be met.
Further, the steel strip is bent back and forth between one bottom angle strip, the top angle strip and the other bottom angle strip in sequence. The whole spiral direction that supports the area of following of billet extends to buckle, and its bending point arranges in proper order on angle strip, top angle strip, another end angle strip, top angle strip, one of them end angle strip at one of them end, when guaranteeing to support the intensity of area, the installation of the billet between top angle strip and this pair of end angle strip is fixed, is favorable to improving the installation effectiveness.
Furthermore, one end of the steel-plastic composite belt extends to the outside of the plastic inner pipe in a spiral mode, the extending section of the steel-plastic composite belt forms a sleeve, and a connecting pipe used for being sleeved with the other end of the steel-plastic composite belt is arranged on the inner wall of the sleeve. When two bellows are connected, the connecting pipe of one bellows is sleeved at one end of the other bellows far away from the sleeve, and the operation is simple, easy and quick.
Preferably, one end of the connecting pipe extends into the steel-plastic composite belt and is tightly sleeved on the plastic inner pipe, and one end of the connecting pipe, which is close to the plastic inner pipe, is provided with a guide surface which is abutted against the steel-plastic composite belt. When the steel-plastic composite strip is wound and wrapped, the guide surface can guide the steel-plastic composite strip to smoothly transit between the plastic inner pipe and the connecting pipe, so that the installation is facilitated, and meanwhile, the structural strength of the transition position can be ensured.
Preferably, a heating wire penetrates through the bottom angle strip, and one end of the heating wire penetrates out of the bottom angle strip and is fixed on the connecting pipe. After the two sections of corrugated pipes are installed, the bottom angle strips, the sleeve and the plastic inner pipe are connected in a hot melting mode by electrifying the heating wires, and the plastic inner pipe and the steel-plastic composite belt and the corrugated pipes can be tightly structured by the structure of layer-by-layer welding and mutual wrapping and supporting, so that the structural strength of the corrugated pipes is ensured.
Further, the steel-plastic composite belt comprises a bonding resin layer, a steel belt layer, a plastic coating layer and a wear-resistant coating which are sequentially connected from inside to outside. The bonding resin layer is convenient for bonding and fixing the top corner strip and the bottom corner strip on the steel-plastic composite strip and bonding and fixing the steel-plastic composite strip on the sleeve and the plastic inner tube, and the strength and the corrosion resistance of the corrugation are respectively enhanced through the steel strip layer, the plastic coating layer and the wear-resistant coating, so that collapse or cracking caused by concrete impact on the outer part of the corrugated pipe during pouring is avoided.
Preferably, the bonding resin of the bonding resin layer is prepared from the following raw materials in parts by weight, 10-25 parts of metallocene linear low density polyethylene; 15-25 parts of maleic anhydride grafted high-density polyethylene; 10-15 parts of polypropylene; 30-35 parts of polyurethane; 5-15 parts of terpene resin; 5-10 parts of nano filler; 0.1-0.5 part of antioxidant. The adhesive resin layer is a key structure for ensuring the adhesive force between each layer of the corrugated pipe, firstly, the metallocene linear low-density polyethylene has very obvious advantages in the aspects of improving and improving the product performance by virtue of the advantages of excellent heat sealing performance, good low-temperature toughness, optical performance, excellent drop hammer impact strength and the like, and then the metallocene linear low-density polyethylene, terpene resin, polypropylene and polyurethane blending system is toughened and modified by maleic anhydride grafted high-density polyethylene, so that the metallocene linear low-density polyethylene can be better adhered to a steel belt layer, and can be shrunk and tightly adhered along with the structure when the shrinkage temperature of the support belt and the plastic inner pipe is higher than the shrinkage temperature of the support belt, so that the adhesive force between a polyethylene material and a steel material is better, and the purposes of sealing and blocking are further achieved.
Specifically, the nano filler is one or a composition of more of nano calcium carbonate, nano zinc oxide and nano silicon dioxide which are treated by a silane coupling agent; the antioxidant is antioxidant 168, antioxidant 245 or antioxidant 300. By optimizing the nano filler and the antioxidant, the influence of light and oxygen on the bonding resin can be blocked strongly, so that the sealing and blocking effects are ensured.
Preferably, the coating of the wear-resistant coating is prepared by mixing the following raw materials in parts by weight, 20-80 parts of polyurethane hexaacrylate; 5-15 parts of epoxy modified acrylate; 5-50 parts of phenoxyethyl acrylate; 5-50 parts of beta-carboxyethyl acrylate; 2-50 parts of pentaerythritol tetraacrylate; 0.5-2.0 parts of butyl titanate; 3-10 parts of cracking type photoinitiator. The plastic coating layer on the outer side of the steel belt layer is mainly used for preventing the steel belt layer from being affected by chemical corrosion, so that the composite wear-resistant coating on the outer side of the plastic coating layer can further prevent the steel belt composite from being corroded on the premise of avoiding the wear of the plastic coating layer, the hardness of the wear-resistant coating is improved by adopting polyurethane hexaacrylate and epoxy modified acrylate, the viscosity and the leveling property of the wear-resistant coating are adjusted by adopting phenoxy ethyl acrylate and beta-carboxyethyl acrylate and pentaerythritol tetraacrylate, and finally the components are promoted to be modified and bonded by the butyl titanate and a cracking photoinitiator, so that the wear resistance and the scratch resistance of the wear-resistant coating can be effectively enhanced.
Specifically, the cleavage type photoinitiator is photoinitiator 184, photoinitiator 1173, or photoinitiator 8700. The compounding effect of the cracking type photoinitiator is optimal.
In conclusion, the beneficial technical effects of the invention are as follows: the mode that the plastic inner pipe is combined with the steel-plastic composite belt is adopted, and the supporting belt after structure optimization is used for filling and supporting, so that the corrugated hardness and the contact area are enhanced, the bonding strength between the corrugated pipe and concrete after installation can be improved, the rigidity of the corrugated pipe can be integrally enhanced, and the use requirements in the field of concrete infrastructure such as bridges and large-span buildings can be met.
Drawings
Fig. 1 is a schematic structural view of a high-strength corrugated pipe for prestressed concrete according to example 1 of the present invention.
Fig. 2 is a schematic view showing the connection relationship among the socket pipe, the connection pipe and the plastic inner pipe according to example 1 of the present invention.
Fig. 3 is a schematic view showing the coupling relationship between the support band and the plastic inner tube according to example 1 of the present invention.
Fig. 4 is a schematic sectional view of a high-strength corrugated pipe for prestressed concrete according to example 1 of the present invention.
In the figure, 1, a plastic inner tube; 2. a support band; 21. a vertex angle bar; 22. a bottom corner strip; 23. a steel bar; 3. a steel-plastic composite strip; 31. an adhesive resin layer; 32. a steel belt layer; 33. coating a plastic layer; 34. a wear-resistant coating; 4. a connecting pipe; 41. a guide surface; 5. a sleeve; 6. a heating wire.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the invention clearer and easier to understand, the invention is further explained in the following with the accompanying drawings and the detailed description.
Examples
Example 1: referring to fig. 1 and 2, the high strength corrugated pipe for prestressed concrete according to the present invention includes a plastic inner pipe 1, a support band 2 spirally wound on the plastic inner pipe 1, and a steel-plastic composite band 3 wrapped on the support band 2 and the plastic inner pipe 1, so that the corrugated pipe has a structure with threads on the outside and a smooth inside.
Referring to fig. 2, in order to facilitate the connection and fixation between the corrugated pipes, a connecting pipe 4 is tightly sleeved at one end of the plastic inner pipe 1, a guide surface 41 is arranged at one end of the connecting pipe 4 close to the plastic inner pipe 1, the other end of the connecting pipe extends and is used for being sleeved with the other end of the steel-plastic composite belt 3, and one end of the steel-plastic composite belt 3 is tightly wound on the connecting pipe 4 along the guide surface 41 and forms a sleeve 5. When the steel-plastic composite belt 3 is wound and wrapped, the guide surface 41 can guide the steel-plastic composite belt 3 to smoothly transit between the plastic inner pipe 1 and the connecting pipe 4, so that the installation is convenient, and meanwhile, the structural strength of the transition position can be ensured. Then when two bellows are connected, the connecting pipe 4 of one bellows is sleeved at one end of the other bellows far away from the sleeve 5, and the operation is simple and rapid.
Referring to fig. 3, the support band 2 is a main structure for enhancing the rigidity of the corrugated pipe, and includes a top angle bar 21 fixed to an inner wall of the steel-plastic composite band 3, a pair of bottom angle bars 22 wound around the plastic inner pipe 1, and steel bars 23 fixed to the top angle bar 21 and the pair of bottom angle bars 22. The steel strip 23 is formed by bending for many times between the bottom angle strip 22 and the top angle strip 21, and the bending sequence of the steel strip 23 is one of the bottom angle strip 22, the top angle strip 21, the other bottom angle strip 22 and the top angle strip 21 in sequence, and one of the bottom angle strip 22 is used for enabling the cross section of the supporting belt 2 to be in a V shape in the tangential projection. In actual installation, the steel strip 23 is bent according to a predetermined shape, the bottom corner strips 22 and the top corner strips 21 made of plastic are fixed on the steel strip 23, the support band 2 is fixed on the steel-plastic composite band 3 in a bonding mode, and the steel-plastic composite band 3 is installed on the plastic inner tube 1.
Through optimizing the structure that supports area 2, so that apex angle strip 21 and this to the base angle strip 22 support to lean on to fix on steel-plastic composite belt 3, make apex angle strip 21 and this to between the base angle strip 22, two adjacent sections of billet 23 and apex angle strip 21 and/base angle strip 22 between homoenergetic line formation triangle bearing structure, when tensile and bending force act on the bellows, this kind of structure can be with the even transmission dispersion that the bellows received, and have better atress effect, consequently, after the installation is accomplished, under the prerequisite of guaranteeing to support area 2 stable bearing plastics inner tube 1 and steel-plastic composite belt 3, make the connection structure between the three more firm, and can increase the weight of bellows, avoid the bellows come-up, thereby can wholly strengthen the rigidity of bellows.
Referring to fig. 2 and 4, in order to match the structures of the sleeve 5, the connecting pipe 4, and the like, a heating wire 6 is inserted into the bottom angle strip 22, and one end of the heating wire 6 penetrates out of the bottom angle strip 22 and is fixed on the connecting pipe 4. After the two sections of corrugated pipes are installed, the electric heating wires are electrified, so that the bottom corner strips 22, the sleeve 5 and the plastic inner pipe 1 are connected in a hot melting mode, and the plastic inner pipe 1 and the steel-plastic composite belt 3 and the corrugated pipes can be tightly structured by the structure of layer-by-layer welding and mutual wrapping and supporting, so that the structural strength of the corrugated pipes is ensured.
Referring to fig. 4, the steel-plastic composite band 3 includes a bonding resin layer 31, a steel band layer 32, a plastic coating layer 33, and a wear-resistant coating layer 34, which are sequentially connected from inside to outside, at the outside where the corrugations of the corrugated pipe are formed. The bonding resin layer 31 facilitates the bonding and fixing of the top corner strip 21 and the bottom corner strip 22 on the steel-plastic composite strip 3 and the bonding and fixing of the steel-plastic composite strip 3 on the sleeve 5 and the plastic inner pipe 1, and the strength and the corrosion resistance of the corrugation are respectively enhanced through the steel strip layer 32, the plastic coating layer 33 and the wear-resistant coating 34, so that the corrugated pipe is prevented from collapsing or cracking due to concrete impact during pouring. The original mode that the outer steel pipe is combined with the inner steel-plastic composite pipe is changed into the mode that the plastic inner pipe 1 is combined with the steel-plastic composite belt 3, and the support belts 2 are used for filling and supporting in the plastic inner pipe, so that the rigidity of the corrugated pipe and the contact area are enhanced, the ring rigidity of the corrugated pipe can be improved, and the bonding strength between the corrugated pipe and concrete after the corrugated pipe is installed is ensured.
Wherein, the bonding resin of the bonding resin layer 31 is prepared by the following raw materials by weight, 10 parts of metallocene linear low density polyethylene; 22 parts of maleic anhydride grafted high-density polyethylene; 15 parts of polypropylene; 33 parts of polyurethane; 5 parts of terpene resin; 5 parts of nano filler; 0.1 part of antioxidant; the nano filler is nano calcium carbonate treated by a silane coupling agent; the antioxidant is antioxidant 168. The adhesive resin layer 31 is a key structure for ensuring the adhesive force between the layers of the corrugated pipe, firstly, the metallocene linear low-density polyethylene has very obvious advantages in the aspects of improving and improving the product performance by virtue of the advantages of excellent heat sealing performance, good low-temperature toughness, optical performance, excellent drop hammer impact strength and the like, and then the metallocene linear low-density polyethylene, terpene resin, polypropylene and polyurethane blending system is toughened and modified by maleic anhydride grafted high-density polyethylene, so that the metallocene linear low-density polyethylene can be better adhered to the steel belt layer 32, and can be shrunk and tightly adhered along with the structure when the shrinkage temperature is higher than the shrinkage temperature of the supporting belt 2 and the plastic inner pipe 1, so that the adhesive force is better for polyethylene materials and steel materials, and the purposes of sealing and blocking are further achieved. In addition, the influence of light and oxygen on the bonding resin can be blocked strongly by optimizing the nano filler and the antioxidant, so that the sealing and blocking effects are ensured.
In addition, the coating of the wear-resistant coating 34 is prepared by mixing the following raw materials in parts by weight, 20 parts of polyurethane hexaacrylate; 10 parts of epoxy modified acrylate; 35 parts of phenoxyethyl acrylate; 15 parts of beta-carboxyethyl acrylate; 2 parts of pentaerythritol tetraacrylate; 0.5 part of butyl titanate; 3 parts of a cracking type photoinitiator; the cleavage type photoinitiator is photoinitiator 184. The plastic coating layer 33 on the outer side of the steel belt layer 32 is mainly used for preventing the steel belt layer 32 from being affected by chemical corrosion, so that the composite wear-resistant coating 34 on the outer side of the plastic coating layer 33 can further prevent the steel-plastic composite belt 3 from being corroded on the premise of avoiding the wear of the plastic coating layer 33, therefore, the hardness of the wear-resistant coating 34 is improved by adopting polyurethane hexaacrylate and epoxy modified acrylate, the viscosity and the leveling property of the wear-resistant coating 34 are adjusted by adopting phenoxy ethyl acrylate and beta-carboxyethyl acrylate and pentaerythritol tetraacrylate, and finally the components are promoted to be modified and bonded by adopting butyl titanate and a cracking photoinitiator, so that the wear resistance and scratch resistance of the wear-resistant coating 34 can be effectively enhanced.
Example 2: the invention discloses a high-strength corrugated pipe for prestressed concrete, which is different from the embodiment 1 in that the weight parts of the bonding resin layer 31 and the raw materials of the coating of the wear-resistant coating 34 are shown in table 1. In addition, the nano filler is nano zinc oxide treated by a silane coupling agent; the antioxidant is an antioxidant 245; the cleavage type photoinitiator is photoinitiator 1173.
Example 3: the invention discloses a high-strength corrugated pipe for prestressed concrete, which is different from the embodiment 1 in that the weight parts of the bonding resin layer 31 and the raw materials of the coating of the wear-resistant coating 34 are shown in table 1. The nano filler is nano calcium carbonate treated by a silane coupling agent; the antioxidant is antioxidant 300; the cleavage type photoinitiator was photoinitiator 8700.
Example 4: the invention discloses a high-strength corrugated pipe for prestressed concrete, which is different from the embodiment 1 in that the weight parts of the bonding resin layer 31 and the raw materials of the coating of the wear-resistant coating 34 are shown in table 1. The nano filler is nano silicon dioxide treated by a silane coupling agent; the antioxidant is antioxidant 168; the cleavage type photoinitiator is photoinitiator 1173.
Example 5: the invention discloses a high-strength corrugated pipe for prestressed concrete, which is different from the embodiment 1 in that the weight parts of the bonding resin layer 31 and the raw materials of the coating of the wear-resistant coating 34 are shown in table 1. The nano filler is nano silicon dioxide treated by a silane coupling agent; the antioxidant is an antioxidant 245; the cleavage type photoinitiator was photoinitiator 8700.
TABLE 1
| Components | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Metallocene linear low density polyethylene | 10 | 15 | 20 | 25 | 17 |
| Maleic anhydride grafted |
22 | 20 | 25 | 15 | 18 |
| Polypropylene | 15 | 13 | 12 | 11 | 10 |
| |
33 | 35 | 32 | 30 | 33 |
| Terpene resin | 5 | 10 | 15 | 13 | 10 |
| Nano-filler | 5 | 10 | 6 | 8 | 8 |
| Antioxidant agent | 0.1 | 0.3 | 0.3 | 0.5 | 0.5 |
| Polyurethane hexaacrylate | 20 | 30 | 50 | 60 | 80 |
| Epoxy modified acrylates | 10 | 15 | 5 | 13 | 10 |
| Phenoxyethyl acrylate | 35 | 25 | 10 | 5 | 50 |
| Beta-carboxyethyl acrylate | 15 | 30 | 50 | 50 | 5 |
| |
2 | 9 | 15 | 30 | 50 |
| Butyl titanate | 0.5 | 1.5 | 1.0 | 2.0 | 1.5 |
| |
3 | 10 | 5 | 9 | 8 |
Performance test
The corrugated pipes of examples 1 to 5 were used as test pieces, and tensile yield strength, elongation at break, flexural strength, ring stiffness and the like were measured. Wherein, the tensile yield strength and the elongation at break are detected according to the methods of GB/T1040.1 and GB/T1040.2, the bending strength is detected according to the method of GB/T9341, the ring stiffness is detected according to the method of GB/T9647, and the detection results are shown in Table 2.
TABLE 2
| Detecting items | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Tensile yield strength (Mpa) | 20.4 | 21.6 | 21.5 | 22.3 | 21.9 |
| Elongation at Break (%) | 590 | 580 | 600 | 630 | 620 |
| Flexural strength (Mpa) | 35.6 | 36.2 | 38.1 | 37.6 | 37.3 |
| Ring stiffness (kN/m) | 6.9 | 7.3 | 7.0 | 6.8 | 7.0 |
As can be seen from table 2, in examples 1 to 5 of the present invention, the plastic inner pipe 1 is combined with the steel-plastic composite strip 3, and the support strip 2 with the optimized structure is used for filling and supporting therein, so that the stiffness of the corrugated pipe can be integrally enhanced while the corrugated hardness and the contact area are enhanced, and the use requirements in the concrete infrastructure field such as bridges and large-span buildings can be satisfied.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The utility model provides a high strength bellows for prestressed concrete which characterized in that: comprises a plastic inner pipe (1), a supporting belt (2) spirally wound on the plastic inner pipe (1), and a steel-plastic composite belt (3) wrapped on the supporting belt (2) and the plastic inner pipe (1); support area (2) including being fixed in apex angle strip (21) and a pair of winding of steel-plastic composite band (3) inner wall are located end angle strip (22) on plastics inner tube (1), are fixed in billet (23) on apex angle strip (21) and this pair of end angle strip (22), billet (23) are in form through buckling many times between end angle strip (22) and apex angle strip (21).
2. The high strength corrugated pipe for prestressed concrete according to claim 1, wherein: the steel bars (23) are bent back and forth among one bottom angle bar (22), the top angle bar (21) and the other bottom angle bar (22) in sequence.
3. The high strength corrugated pipe for prestressed concrete according to claim 1, wherein: one end of the steel-plastic composite belt (3) extends to the outside of the plastic inner pipe (1) in a spiral mode, an extending section of the steel-plastic composite belt (3) forms a sleeve (5), and a connecting pipe (4) which is used for being sleeved with the other end of the steel-plastic composite belt (3) is arranged on the inner wall of the sleeve (5).
4. The high strength corrugated pipe for prestressed concrete according to claim 3, wherein: one end of the connecting pipe (4) extends into the steel-plastic composite belt (3) and is tightly sleeved on the plastic inner pipe (1), and one end of the connecting pipe (4) close to the plastic inner pipe (1) is provided with a guide surface (41) which is abutted against the steel-plastic composite belt (3).
5. The high strength corrugated pipe for prestressed concrete according to claim 3, wherein: a heating wire (6) penetrates through the bottom angle strip (22), and one end of the heating wire (6) penetrates out of the outer part of the bottom angle strip (22) and is fixed on the connecting pipe (4).
6. A high-strength corrugated pipe for prestressed concrete according to any one of claims 1 to 5, wherein: the steel-plastic composite belt (3) comprises a bonding resin layer (31), a steel belt layer (32), a plastic coating layer (33) and a wear-resistant coating (34) which are sequentially connected from inside to outside.
7. The high strength corrugated pipe for prestressed concrete according to claim 6, wherein: the adhesive resin of the adhesive resin layer (31) is prepared from the following raw materials in parts by weight,
10-25 parts of metallocene linear low-density polyethylene;
15-25 parts of maleic anhydride grafted high-density polyethylene;
10-15 parts of polypropylene;
30-35 parts of polyurethane;
5-15 parts of terpene resin;
5-10 parts of nano filler;
0.1-0.5 part of antioxidant.
8. The high strength corrugated pipe for prestressed concrete according to claim 7, wherein: 8. the nano filler is one or a composition of more of nano calcium carbonate, nano zinc oxide and nano silicon dioxide which are treated by a silane coupling agent; the antioxidant is antioxidant 168, antioxidant 245 or antioxidant 300.
9. The high strength corrugated pipe for prestressed concrete according to claim 6, wherein: the coating of the wear-resistant coating (34) is formed by mixing the following raw materials in parts by weight,
20-80 parts of polyurethane hexaacrylate;
5-15 parts of epoxy modified acrylate;
5-50 parts of phenoxyethyl acrylate;
5-50 parts of beta-carboxyethyl acrylate;
2-50 parts of pentaerythritol tetraacrylate;
0.5-2.0 parts of butyl titanate;
3-10 parts of cracking type photoinitiator.
10. The high strength corrugated pipe for prestressed concrete according to claim 9, wherein: the cleavage type photoinitiator is photoinitiator 184, photoinitiator 1173 or photoinitiator 8700.
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| CN202110986575.5A CN113756178A (en) | 2021-08-26 | 2021-08-26 | High-strength corrugated pipe for prestressed concrete |
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| CN202110986575.5A CN113756178A (en) | 2021-08-26 | 2021-08-26 | High-strength corrugated pipe for prestressed concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114719097A (en) * | 2022-06-08 | 2022-07-08 | 山东交通学院 | Corrugated pipe suitable for winter prestressed pipeline grouting and use method |
-
2021
- 2021-08-26 CN CN202110986575.5A patent/CN113756178A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114719097A (en) * | 2022-06-08 | 2022-07-08 | 山东交通学院 | Corrugated pipe suitable for winter prestressed pipeline grouting and use method |
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