Fiber composite anchor rod

Abstract

The utility model provides a fiber composite anchor rod which is used for solving the problem that in the prior art, the application range of a fiber composite anchor rod is limited. The anchor core is made of a plurality of first fiber composite material bundles, the woven layer is arranged on the outer side face of the anchor core and made of a plurality of second fiber composite material bundles, and the reinforcing ribs are formed after third fiber composite material bundles are spirally wound on the outer side face of the woven layer. Wherein the first fiber composite material bundle and the second fiber composite material bundle are different types of fiber composite material bundles; the first fiber composite material bundle for manufacturing the anchor core and the second fiber composite material bundle for manufacturing the weaving layer are different fiber composite material bundles, so that the respective mechanical properties of the two different fiber composite material bundles can be utilized to form a complementary effect, the overall mechanical property of the anchor rod is improved, and the application range of the anchor rod is expanded.

Description

TECHNICAL FIELD

[0001] The utility model belongs to civil engineering field, especially relate to a fiber composite anchor rod. BACKGROUND

[0002] Anchor rod support is a commonly used rock soil anchoring form, which can be used in underground engineering, slope stability, tunnel construction, mine roadway, deep foundation pit support and various rock soil reinforcement engineering. It provides stable support force by embedding anchor rod in rock soil body and using the adhesion and friction between anchor rod and surrounding rock soil body, thereby enhancing the overall stability of rock soil body and ensuring the safety of engineering structure. The commonly used steel anchor rod has the disadvantages of insufficient strength, excessive self-weight, easy corrosion, large creep and relaxation, etc., which are increasingly difficult to meet the construction requirements of high performance and long life of rock soil anchoring in new period infrastructure construction.

[0003] In order to solve the problems of steel anchor rod, in the prior art, fiber composite (i.e. fiber reinforced polymer (FRP), which is an advanced material formed by the fusion of various types of fiber reinforced phase with high strength, high toughness, high temperature resistance and other characteristics and resin matrix phase) is used to make anchor rod, such as glass fiber composite anchor rod made of glass fiber composite, basalt fiber composite anchor rod made of basalt fiber composite and carbon fiber composite anchor rod made of carbon fiber composite. However, due to the large creep, low creep fracture stress, low shear and bending strength of glass fiber composite and basalt fiber composite anchor rod, and the small fracture elongation rate, high price and low shear and bending strength of carbon fiber composite anchor rod, the application range of fiber composite anchor rod is limited, which cannot be applied on a large scale. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present utility model is to provide a fiber composite anchor rod to solve the problem of limited application range of fiber composite anchor rod in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides an anchor rod made of fiber composite, which comprises: an anchor core made of a plurality of first fiber composite bundles, a woven layer made of a plurality of second fiber composite bundles arranged on the outer side of the anchor core, and a reinforcing rib formed after the third fiber composite bundle is spirally wound on the outer side of the woven layer; wherein the first fiber composite bundle and the second fiber composite bundle are different types of fiber composite bundles.

[0006] Optionally, the first fiber composite bundle comprises a first sub-fiber composite bundle and a second sub-fiber composite bundle, and the first sub-fiber composite bundle and the second sub-fiber composite bundle form the anchor core by hybrid pultrusion.

[0007] Optionally, the first sub-fiber composite bundle is a glass fiber composite bundle; and / or, the second sub-fiber composite bundle is a carbon fiber composite bundle.

[0008] Optionally, the second fiber composite bundle and the second fiber composite bundle are the same kind of fiber composite bundle.

[0009] Optionally, the second fiber composite bundle and / or the third fiber composite bundle is an LCP fiber composite bundle.

[0010] Optionally, the reinforcing rib comprises at least two third fiber composite bundles, and the at least two third fiber composite bundles are cross-wound on the woven layer.

[0011] Optionally, the anchor rod further comprises a bonding agent, and the bonding agent is used to bond the woven layer on the anchor core and to bond the reinforcing rib on the woven layer.

[0012] Optionally, the bonding agent is a thermosetting resin.

[0013] Optionally, the bonding agent is an epoxy resin or a vinyl ester resin.

[0014] In another aspect, the utility model also provides a fiber composite anchor rod production system, and the production system is used for producing the fiber composite bundle anchor rod as described above.

[0015] As described above, the fiber composite anchor rod and the fiber composite anchor rod production system of the utility model have at least the following beneficial effects:

[0016] 1. The woven layer made of a plurality of second fiber composite bundles is arranged on the outer side of the anchor core to improve the overall strength of the anchor rod and increase the contact area between the anchor rod and the grouting material, which is beneficial to the penetration and curing of the grouting material.

[0017] 2. The third fiber composite bundle is spirally wound on the outer side of the woven layer to form a reinforcing rib on the outer side of the woven layer, that is, to simulate the structure of a threaded steel bar. This structure not only increases the surface area of the anchor rod, but also increases the mechanical engagement force between the anchor rod and the grouting material, thereby significantly improving the anchoring effect and meeting the demand of complex geotechnical engineering on the mechanical properties of the anchor rod.

[0018] 3. The first fiber composite bundle for making the anchor core and the second fiber composite bundle for making the woven layer are different fiber composite bundles. In this way, the mechanical properties of the two different fiber composite bundles can be utilized to form a complementary effect to improve the overall mechanical properties of the anchor rod and expand the application range of the anchor rod. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure of the fiber composite anchor rod of the utility model is shown.

[0020] Figure 2The structure diagram of the fiber composite anchor rod production system is shown.

[0021] Element number explanation:

[0022] 1, anchor core, 2, braided layer, 3, reinforcing rib, 4, fiber yarn frame, 5, calibration plate, 6, main glue tank, 7, round tube type pre-mold, 8, braiding machine, 9, secondary glue tank, 10, winding machine, 11, heating and curing mold, 12, traction device, 13, cutting saw. DETAILED DESCRIPTION

[0023] The following specific embodiments illustrate the embodiments of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosed content.

[0024] Please refer to the following drawings. It should be noted that the structures, proportions, sizes, etc. shown in the drawings of the present application are only used to illustrate the disclosed content, to facilitate understanding and reading by those skilled in the art, and are not intended to limit the scope of the present application, so they do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" used in the present application are only for the convenience of clear description, and are not intended to limit the scope of the present application, the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0025] The following embodiments are only for illustration. The various embodiments can be combined, which are not limited to the content shown in the following single embodiment.

[0026] Please refer to Figure 1 The present application provides a kind of anchor rod made of fiber composite, anchor rod includes: from the anchor core 1 made of multiple first fiber composite bundle, the braided layer 2 made of multiple second fiber composite bundle is arranged on the outer side of anchor core 1, and after the third fiber composite bundle is spirally wound on the outer side of braided layer 2, reinforcing rib 3 is formed;Wherein, first fiber composite bundle and second fiber composite bundle are different kinds of fiber composite bundle.

[0027] The braided layer 2 can be a braided structure formed by braiding a plurality of second fiber composite bundles, which is wrapped on the outer side of the anchor core 1. The braided structure not only improves the overall strength of the anchor rod, but also increases the contact area between the anchor rod and the grouting material, which is conducive to the penetration and curing of the grouting material. The third fiber composite bundle is spirally wound on the outer side of the braided layer 2 to form a reinforcing rib 3 on the outer side of the braided layer 2, i.e. to simulate the structure of a threaded steel bar. This structure not only increases the surface area of the anchor rod, but also increases the mechanical engagement force between the anchor rod and the grouting material, thereby significantly improving the anchoring effect and meeting the demand of complex geotechnical engineering for the mechanical properties of the anchor rod. In addition, in the embodiment, the first fiber composite bundle and the second fiber composite bundle are different fiber composite bundles. In this way, the mechanical properties of the two different fiber composite bundles can be utilized to form a complementary effect to improve the overall mechanical properties of the anchor rod. For example, the first fiber composite bundle can be a high-strength and high-modulus carbon fiber composite bundle to improve the tensile strength and stiffness of the anchor rod; and the second fiber composite bundle and the third fiber composite bundle can be a glass fiber composite bundle or a basalt fiber composite bundle, etc. which has good toughness and corrosion resistance, to enhance the durability and adaptability of the anchor rod, thereby expanding the application range of the anchor rod.

[0028] In an embodiment, the anchor core 1 can be made of one fiber composite bundle, for example, a glass fiber bundle; or can be made of a plurality of fiber composite bundles, i.e. the first fiber composite bundle can include a first sub-fiber composite bundle and a second sub-fiber composite bundle, and the first sub-fiber composite bundle and the second sub-fiber composite bundle form the anchor core 1 by hybrid pultrusion technology. The first sub-fiber composite bundle can be a high-strength and high-modulus carbon fiber composite bundle or an aramid fiber composite bundle to improve the tensile strength and stiffness of the anchor core 1; and the second sub-fiber composite bundle can be a glass fiber composite bundle or a basalt fiber composite bundle to enhance the toughness and corrosion resistance of the anchor core 1. In the embodiment, the first sub-fiber composite bundle is a glass fiber composite bundle, and the second sub-fiber composite bundle is a carbon fiber composite bundle. By using a glass fiber composite bundle and a carbon fiber composite bundle to make the anchor core 1, the creep of the anchor rod made of pure glass fiber composite bundle or pure carbon fiber composite bundle can be effectively reduced, and the mechanical properties can be improved.

[0029] The second fiber composite bundle or the third fiber composite bundle can be a glass fiber composite bundle, a carbon fiber composite bundle, or an LCP fiber composite bundle, etc. In this embodiment, the second fiber composite bundle is an LCP fiber composite bundle. After being braided and wound on the anchor core 1, the LCP fiber composite bundle can improve the shear and bending resistance of the anchor rod. In one implementation, the second fiber composite bundle can be 16, and of course, in other implementations, the second fiber composite bundle can also be other quantities, which are not limited in this embodiment. The third fiber composite bundle can also be an LCP fiber composite bundle, i.e., the second fiber composite bundle and the second fiber composite bundle are the same kind of fiber composite bundle. This design not only improves the anchoring effect and durability of the anchor rod, but also takes advantage of the good processing performance of the LCP fiber bundle to facilitate the processing of the braided layer 2 and the reinforcing rib 3, thereby reducing production costs.

[0030] The reinforcing rib 3 includes at least two third fiber composite bundles, and the at least two third fiber composite bundles are cross-wound on the braided layer 2. The third fiber composite bundle can be two, three, four, etc., which are not limited in this embodiment. The at least two third fiber composite bundles are cross-wound on the braided layer 2. On the one hand, a more complex and solid fiber network can be formed. This network structure can more effectively disperse and resist the pressure and shear force from the surrounding soil, thereby improving the overall structural strength of the anchor rod. On the other hand, the cross-wound fiber composite bundles can support each other to prevent the overall structure from failing due to the breakage of a single fiber bundle. This design increases the redundancy of the anchor rod and improves its stability under extreme conditions. On the other hand, the cross-wound fiber composite bundles can more evenly distribute stress and reduce stress concentration. This helps to prolong the service life of the anchor rod and reduce the risk of potential failure due to stress concentration.

[0031] In one embodiment, the anchor rod further includes an adhesive for bonding the braided layer 2 to the anchor core 1 and for bonding the reinforcing rib 3 to the braided layer 2. On the one hand, the adhesive can tightly combine the braided layer 2 with the anchor core 1 to form an integral structure. This helps to prevent relative movement between the braided layer 2 and the anchor core 1, improving the overall stability of the anchor rod. At the same time, the adhesive also tightly combines the reinforcing rib 3 with the braided layer 2, ensuring that the reinforcing rib 3 can effectively transfer and disperse stress, further enhancing the load-carrying capacity of the anchor rod. On the other hand, the adhesive can enhance the mechanical properties of the anchor rod such as tensile, shear, and uplift resistance; through good adhesion, the various parts of the anchor rod can work together to resist external loads; the adhesive can also reduce stress concentration during the stress process of the anchor rod, improving the fatigue life and durability of the anchor rod.

[0032] The binder can be a thermosetting resin. The thermosetting resin has high strength and rigidity after curing, which can provide stable mechanical support for the anchor rod, which helps to ensure that the anchor rod will not deform or be damaged during the stress process. It also has excellent bonding performance: it can penetrate between the fibers of the woven layer 2 and the reinforcing rib 3 to form a tight bond, thereby enhancing the overall structural strength of the anchor rod. In addition, the thermosetting resin will undergo a chemical reaction during the curing process to form a three-dimensional network structure. Once this structure is formed, it cannot be restored to its original state by heating or other means, which ensures that the anchor rod will not be damaged due to the failure of the binder during use. In optional embodiments, the binder is an epoxy resin or a vinyl ester resin. In actual application, the binder can be selected according to different engineering scenarios, for example, in engineering scenarios with high temperature or chemicals, a vinyl ester resin can be selected; in engineering scenarios requiring high strength anchoring, an epoxy resin can be selected.

[0033] In another aspect of the utility model, as Figure 2 shown, a fiber composite anchor rod production system is also provided. The production system is used for producing the fiber composite anchor rod as described above. Specifically, the production system includes a fiber yarn rack 4, a calibration plate 5, a main resin immersion tank 6, a circular tube-shaped pre-mold 7, a braiding machine 8, a secondary resin immersion tank 9, a winding machine 10, a heating and curing mold 11, a traction device 12, and a cutting saw 13. The fiber yarn rack is used for storing the first fiber composite bundle. The calibration plate 5 is used for straightening the first fiber composite bundle. The main resin immersion tank 6 is used for performing immersion treatment on the first fiber composite bundle. The circular tube-shaped pre-mold 7 is used for extruding the first fiber composite bundle to form the anchor core 1. The braiding machine 8 is used for braiding the second fiber composite bundle on the outer side surface of the anchor core 1 to form the woven layer 2. The secondary resin immersion tank 9 is used for performing immersion treatment on the woven layer 2. The winding machine 10 is used for spirally winding the third fiber composite bundle on the woven layer 2. The traction device 12 is used for pulling the fiber composite anchor rod.

[0034] In use, the traction device 12 extracts multiple first fiber composite bundles from the fiber yarn rack 4, and straightens the multiple first fiber composite bundles through the calibration plate 5 to ensure uniform arrangement and neatness of the fiber bundles. After being straightened, the multiple first fiber composite bundles enter the main resin immersion tank 6 containing the thermosetting resin, so that the first fiber composite bundles are immersed in the thermosetting resin, and then the fibers are bonded to each other, while providing the necessary corrosion resistance and high strength performance for the produced fiber composite anchor rod.

[0035] The produced fiber composite anchor rod is pulled by the traction device 12, and then the first fiber composite bundle immersed in the thermosetting resin is pulled through the circular tube-shaped pre-mold 7. The first fiber composite bundle immersed in the thermosetting resin is extruded in the pre-mold to form the anchor core 1, and at the same time, the braiding machine 8 braids multiple second fiber composite bundles on the surface to form a uniform woven layer 2.

[0036] Under the traction of the traction device 12, the anchor core 1 after weaving enters the secondary impregnation groove 9 filled with thermosetting resin to perform secondary impregnation treatment, thereby providing an attachment basis for the third fiber composite bundle. The anchor core 1 after weaving enters the winding machine 10 after the secondary impregnation treatment, the winding machine 10 uses the third fiber composite bundle to be wound on the woven layer 2 in a spiral shape, thereby forming the reinforcing rib 3, and further obtaining the anchor rod semi-finished product.

[0037] The anchor rod semi-finished product is sent into the heating and curing mold 11, so that the anchor core 1, the woven layer 2 and the reinforcing rib 3 are tightly combined to form a whole under the action of the thermosetting resin, and finally the fiber composite anchor rod is obtained. The fiber composite anchor rod is cut by the cutting saw 13 after passing through the traction device 12, and different lengths of the fiber composite anchor rod can be obtained.

[0038] The above embodiment only exemplarily illustrates the principle and effect of the present application, and is not used to limit the present application. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A fiber reinforced composite anchor rod, characterized by, The anchor rod comprises: an anchor core made of a plurality of first fiber composite strands, a braided layer made of a plurality of second fiber composite strands arranged on the outer side of the anchor core, and a reinforcing rib formed after a third fiber composite strand is spirally wound on the outer side of the braided layer; Wherein, the first fiber composite strand and the second fiber composite strand are different types of fiber composite strands.

2. A fibre reinforced anchor according to claim 1, characterised in that: The first fiber composite strand comprises a first sub-fiber composite strand and a second sub-fiber composite strand, and the first sub-fiber composite strand and the second sub-fiber composite strand form the anchor core by hybrid pultrusion.

3. A fibre reinforced anchor according to claim 2, characterised in that: The first sub-fiber composite strand is a glass fiber composite strand; And / or, the second sub-fiber composite strand is a carbon fiber composite strand.

4. A fibre reinforced anchor rod according to claim 1, characterised in that: The second fiber composite strand and the second fiber composite strand are the same type of fiber composite strand.

5. A fibre composite anchor according to claim 1 or 4, characterised in that: The second fiber composite strand and / or the third fiber composite strand is an LCP fiber composite strand.

6. A fibre reinforced anchor rod as claimed in claim 1, wherein: The reinforcing rib comprises at least two third fiber composite strands, and the at least two third fiber composite strands are cross-wound on the braided layer.

7. A fibre reinforced anchor rod as claimed in claim 1, wherein: The anchor rod further comprises a bonding agent for bonding the braided layer to the anchor core and for bonding the reinforcing rib to the braided layer.

8. A fibre reinforced anchor according to claim 7, characterised in that: The bonding agent is a thermosetting resin.

9. A fibre reinforced anchor according to claim 8, characterised in that: The bonding agent is an epoxy resin or a vinyl ester resin.

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