Insulation connection structure for steel bars and preparation method thereof

By using a combination method of epoxy resin and insulating gaskets in the steel bar connection structure, the problem of the insulation resistance requirements of the embedded steel bars in the concrete to the ground is solved, and efficient insulation effect and mechanical connection strength are achieved.

CN116044095BActive Publication Date: 2024-12-13PANGANG GRP ENG TECH
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Patent Information

Application Number
CN202310260814.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-17
Publication Date
2024-12-13
Estimated Expiration
2043-03-17

AI Technical Summary

Technical Problem

In metallurgical/electric power construction, it is a problem to achieve high insulation resistance requirements for the ground by embedded steel bars in concrete, and it is difficult to effectively solve the existing technology.

Method used

A method of preparing an insulating connection structure is adopted, including applying a formulation on the inner surface of the steel casing, inserting an epoxy resin casing and tightly bonding, injecting the formulation into the casing and curing, opening threaded holes, and installing insulating gaskets to separate Space to ensure the separation and connection between steel bars and insulating materials and meet the insulation requirements.

Benefits of technology

It realizes high insulation resistance of steel bars to the ground, meets the insulation resistance requirements of more than 200MΩ, and at the same time improves the strength and mechanical joint force of the threaded holes, ensuring the safety and efficiency of construction.

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Abstract

The present invention discloses an insulating connection structure for steel bars and a preparation method thereof. The method comprises the following steps in sequence: applying a formulation on the inner surface of a steel casing; inserting an epoxy resin casing coaxially into the steel casing, and making the steel casing and the epoxy resin casing tightly bonded by the formulation; injecting the formulation into the epoxy resin casing; opening a threaded hole coaxial with the steel casing on the cured product of the injected formulation; installing an insulating gasket in the threaded hole to separate the space in the threaded hole; wherein the formulation is prepared from at least epoxy resin, epoxy curing agent and epoxy resin diluent. The present invention can meet the requirements of steel bar insulation connection and can also ensure good connection strength.
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Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to an insulating connection structure for steel bars and a preparation method thereof. Background Art

[0002] In metallurgical / electric power construction, according to process requirements, it is required that the pre-buried steel bars in the concrete be insulated from the ground. For example, the pre-buried steel bars in the concrete prefabricated columns of the magnesium chloride electrolysis workshop supporting the magnesium process titanium sponge production line are required to achieve an insulation resistance of more than 200MΩ to the ground in a 1000V voltage test. How to achieve the insulation resistance requirements of the pre-buried steel bars in the concrete structure is a difficult problem for construction, so it is urgent to develop an insulating connection structure for steel bars and its preparation method. Summary of the invention

[0003] The main purpose of the present invention is to provide an insulating connection structure for steel bars and a preparation method thereof, so as to achieve the insulation requirement of pre-buried steel bars in concrete to the ground.

[0004] According to one aspect of the present invention, a method for preparing an insulating connection structure for steel bars is provided, comprising the following steps performed in sequence:

[0005] Applying the formulation to the inner surface of the steel casing;

[0006] Inserting the epoxy resin sleeve coaxially into the steel sleeve, and making the steel sleeve and the epoxy resin sleeve tightly bonded by the formulation;

[0007] injecting the formulation into the epoxy resin sleeve;

[0008] A threaded hole coaxial with the steel casing is formed on the solidified product of the injected formulation;

[0009] Installing an insulating gasket in the threaded hole to separate the space in the threaded hole;

[0010] The formulation is prepared from at least epoxy resin, epoxy curing agent and epoxy resin diluent.

[0011] According to one embodiment of the present invention, the formulation is prepared by at least epoxy resin, epoxy curing agent and epoxy resin diluent in a mass ratio of 100:18:20, the model of the epoxy resin is E-44 6101, and the model of the epoxy curing agent is CYDHD-531.

[0012] According to an embodiment of the present invention, the insulating gasket is perpendicular to the axis of the threaded hole.

[0013] According to an embodiment of the present invention, the insulating gasket abuts against the hole wall of the threaded hole.

[0014] According to one embodiment of the present invention, the coating thickness of the formulation is 3 mm.

[0015] According to one embodiment of the present invention, after applying the formulation, the method further comprises: performing vacuum extraction to remove bubbles in the formulation.

[0016] According to one embodiment of the present invention, before injecting the formulation, the method further comprises: sealing the tube opening at one end of the epoxy resin sleeve.

[0017] According to one embodiment of the present invention, the method further comprises: performing an insulation test after the epoxy resin sleeve is coaxially inserted into the steel sleeve, after the threaded hole is opened, and / or after the two steel bars are threadedly connected to the insulating connection structure.

[0018] According to another aspect of the present invention, an insulating connection structure for steel bars is provided, comprising:

[0019] Steel casing;

[0020] coating;

[0021] an epoxy resin sleeve coaxially disposed in the steel sleeve, wherein the epoxy resin sleeve is tightly bonded to the steel sleeve through the coating;

[0022] An insulating ring is coaxially arranged in the epoxy resin sleeve, the outer surface of the insulating ring is bonded to the inner surface of the epoxy resin sleeve, and the inner surface of the insulating ring forms a thread structure;

[0023] An insulating gasket, installed in the insulating ring and dividing the space in the insulating ring;

[0024] The coating and the insulating ring are cured products of a formulation, and the formulation is prepared from at least epoxy resin, epoxy curing agent and epoxy resin diluent.

[0025] According to one embodiment of the present invention, the formulation is prepared by at least epoxy resin, epoxy curing agent and epoxy resin diluent in a mass ratio of 100:18:20, the model of the epoxy resin is E-44 6101, and the model of the epoxy curing agent is CYDHD-531.

[0026] Through the technical solution of the present invention, two steel bars can be respectively matched with threaded holes prepared by insulating materials (cured products of the formulation), and the two steel bars can be separated by insulating gaskets, so as to achieve good insulation connection of the steel bars and meet the insulation requirements of the steel bars to the ground. In addition, by applying the formulation, the steel casing and the epoxy resin casing can be tightly bonded and the strength of the bonding can be guaranteed; the threaded hole is opened on the cured product of the injected formulation to ensure the high strength of the threaded hole, thereby ensuring good mechanical bite force when the threaded hole cooperates with the threaded structure of the steel wire head, and ensuring the required mechanical connection strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A flow chart showing a method for preparing an insulating connection structure for steel bars according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram showing an intermediate product obtained after inserting an epoxy resin sleeve into a steel sleeve according to an embodiment of the present invention;

[0030] Figure 3 A schematic diagram showing an intermediate product obtained after injecting a formulation into an epoxy resin sleeve according to an embodiment of the present invention;

[0031] Figure 4 A schematic diagram showing the connection between a final product and steel bars according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0033] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0034] Figure 1 A flow chart showing a method for preparing an insulating connection structure for steel bars according to an embodiment of the present invention is shown. Figure 1 As shown, the method comprises the following steps performed in sequence:

[0035] S1, applying the formulation on the inner surface of the steel casing;

[0036] S2, coaxially inserting the epoxy resin sleeve into the steel sleeve, and making the steel sleeve and the epoxy resin sleeve tightly bonded by the formulation;

[0037] S3, injecting the formulation into the epoxy resin sleeve;

[0038] S4, forming a threaded hole coaxial with the steel casing on the solidified product of the injected formulation;

[0039] S5, installing an insulating gasket in the threaded hole to separate the space in the threaded hole;

[0040] The formulation is prepared from at least epoxy resin, epoxy curing agent and epoxy resin diluent.

[0041] In the embodiment of the present invention, at least epoxy resin, epoxy curing agent and epoxy resin diluent are used to prepare the formulation. Such a formulation has a strength significantly better than the epoxy resin itself after curing, so that the strength of the insulating connection structure finally obtained can be guaranteed. In particular, for the threaded hole, the higher strength ensures that when it cooperates with the straight thread structure of the steel wire head, it can achieve good mechanical bite force, thereby ensuring the required mechanical connection strength. At the same time, the formulation has a more excellent bonding force, which can achieve a tight bond between the steel casing and the epoxy resin casing, and can ensure the strength of the bonding point. On the basis of ensuring good strength, through the technical solution of the present invention, the two steel bars can be respectively matched with the threaded holes prepared by the insulating material (cured product of the formulation), and the two steel bars can be separated by an insulating gasket, so as to achieve a good insulation connection of the steel bars and meet the insulation requirements of the steel bars to the ground.

[0042] In some embodiments, the formulation is prepared by at least epoxy resin, epoxy curing agent and epoxy resin diluent in a mass ratio of 100:18:20, the epoxy resin model is E-446101, and the epoxy curing agent model is CYDHD-531. Such a ratio and raw material model selection can achieve excellent adhesion and strength after curing of the formulation, so that the finally obtained insulating connection structure can well meet the strength requirements and insulation requirements.

[0043] Before step S1, the steel casing can be made. The seamless steel pipe can be cut to obtain the required steel casing. The length of the steel casing is not less than 5 times the outer diameter of the steel bar to meet the specifications and achieve a good connection effect on the steel bar. The inner diameter of the steel casing can be 5-8mm larger than the outer diameter of the steel bar to ensure that there is enough space in the steel casing to set up corresponding components and materials later. The wall thickness of the steel casing can be 16mm. The inner and outer surfaces of the manufactured steel casing can be derusted and polished.

[0044] In order to ensure that the steel casing and the epoxy resin casing are tightly bonded by the formulation, the formulation can be applied thinly, for example, the thickness of the formulation can be 3 mm, so as to prevent bubbles from being generated in the applied formulation. In addition, after applying the formulation, the method further includes: vacuuming to remove bubbles in the formulation, further removing bubbles to prevent bubbles from hindering the tight bonding of the steel casing and the epoxy resin.

[0045] In step S2, the outer diameter of the epoxy resin sleeve inserted into the steel sleeve can be 3-5 mm smaller than the inner diameter of the steel sleeve, the wall thickness of the epoxy resin sleeve can be 1.5 mm, and the axial length of the epoxy resin sleeve can be the same as the axial length of the steel sleeve. Figure 2 A schematic diagram showing an intermediate product obtained after inserting an epoxy resin sleeve into a steel sleeve according to an embodiment of the present invention, as shown in Figure 2 As shown, the steel casing and the epoxy resin casing are coaxially arranged, the epoxy resin casing is located inside the steel casing, and the outer wall of the epoxy resin casing and the inner wall of the steel casing are tightly bonded by the formulation.

[0046] After step S2, after a predetermined time (e.g., 24 hours) to ensure that the applied formulation is completely cured, step S3 is performed. Before injecting the formulation, the nozzle at one end of the epoxy resin sleeve can be sealed (e.g., using tape to seal) to prevent the formulation from leaking out of the nozzle. Figure 3 A schematic diagram showing an intermediate product obtained after injecting a formulation into an epoxy resin sleeve according to an embodiment of the present invention is shown. Figure 3 As shown, the steel sleeve and the epoxy resin sleeve are coaxially sleeved together with the smeared formulation between them, and the epoxy resin sleeve is filled with the injected formulation.

[0047] After step S3, after a predetermined time (for example, 24 hours) to ensure that the injected formulation is completely cured, step S4 is performed. In step S4, the internal thread can be machined using a lathe. The internal thread of the threaded hole matches the external thread of the steel wire head.

[0048] In step S5, the insulating gasket can be perpendicular to the axis of the threaded hole, and the insulating gasket can abut against the hole wall of the threaded hole to achieve fixation. The insulating gasket can be circular and its radial dimension matches the radial dimension of the threaded hole. The thickness of the insulating gasket can be 2mm. The insulating gasket can be made of any suitable insulating material, such as epoxy resin, polyurethane. When connecting steel bars, the thread heads of the two steel bars can be respectively located in two spaces separated by the insulating gasket to ensure that the two steel bar thread heads are not in direct contact when connected, thereby achieving an insulating effect.

[0049] In some embodiments, the method further comprises: performing an insulation test after the epoxy resin sleeve is coaxially inserted into the steel sleeve, after the threaded hole is opened, and / or after the two steel bars are threadedly connected to the insulating connection structure. By performing insulation tests respectively after multiple steps of the method, and eliminating unqualified products according to the test results, qualified products enter the next step. The standard for passing the test can be that when the insulation test voltage is 1000V, the measured insulation resistance reaches more than 200MΩ.

[0050] Figure 4 A schematic diagram showing the connection between the final product (insulated connection structure 100) and the steel bar 200 according to an embodiment of the present invention is shown. Figure 4 As shown, the insulating connection structure 100 includes: a steel casing 10; a coating 20; an epoxy resin casing 30 coaxially arranged in the steel casing 10, the epoxy resin casing 30 is tightly bonded to the steel casing 10 through the coating 20; an insulating ring 40 coaxially arranged in the epoxy resin casing 30, the outer surface of the insulating ring 40 is bonded to the inner surface of the epoxy resin casing 30, and the inner surface of the insulating ring 40 forms a thread structure; an insulating gasket 50, which is installed in the insulating ring 40 and separates the space in the insulating ring 40; wherein the coating 20 and the insulating ring 40 are cured products of the formulation, and the formulation is prepared by at least epoxy resin, epoxy curing agent and epoxy resin diluent. The thread heads 202 of the two steel bars 200 extend into the insulating ring 40 from the opposite sides respectively, the outer thread structure of the thread head 202 cooperates with the inner thread structure of the insulating ring 40, and the insulating gasket 50 blocks between the thread heads 202 of the two steel bars 200.

[0051] In some embodiments, the formulation is prepared by at least epoxy resin, epoxy curing agent and epoxy resin diluent in a mass ratio of 100:18:20, the model of the epoxy resin is E-446101, and the model of the epoxy curing agent is CYDHD-531.

[0052] To summarize, in an embodiment of the present invention, an epoxy resin insulating sleeve is added to the inside of a traditional steel bar straight thread connection sleeve, and the steel sleeve / epoxy resin sleeve is bonded and filled by a formulation, and after the formulation is cured, a straight thread is turned in the middle of the epoxy resin filler by a lathe, and then an insulating gasket is installed, and finally the two straight threaded steel bars are butt-jointed and tightened to ensure that the two steel bar wire heads are not in direct contact when butt-jointed, thereby achieving an insulating effect. The technical solution of the present invention can be applied to construction such as power construction / metallurgy, especially in the construction of pre-buried steel bars in building structures with insulation requirements, to meet the requirement that the insulation resistance value of concrete structural parts to the ground is above 20MΩ, and has the advantages of low construction cost, low skill requirements for operators, simple and convenient operation, and good insulation effect. In addition to being applicable to the construction of pre-buried steel bars in concrete structural parts of building projects with insulation requirements to the ground, the technical solution of the present invention can also be applied to the insulation construction of other concrete structural parts.

[0053] A person skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the embodiments of the present invention as described above, which are not provided in detail for the sake of simplicity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A method for preparing an insulating connection structure for steel bars, characterized in that: The method includes the following steps: Applying the formulation to the inner surface of the steel casing; Inserting the epoxy resin sleeve coaxially into the steel sleeve, and making the steel sleeve and the epoxy resin sleeve tightly bonded by the formulation; injecting the formulation into the epoxy resin sleeve; A threaded hole coaxial with the steel casing is formed on the solidified product of the injected formulation; Installing an insulating gasket in the threaded hole to separate the space in the threaded hole; The formulation is prepared from at least epoxy resin, epoxy curing agent and epoxy resin diluent.

2. The method according to claim 1, characterized in that The formulation is prepared by at least epoxy resin, epoxy curing agent and epoxy resin diluent in a mass ratio of 100:18:

20. The model of the epoxy resin is E-44 6101, and the model of the epoxy curing agent is CYDHD-531.

3. The method according to claim 1, characterized in that The insulating gasket is perpendicular to the axis of the threaded hole.

4. The method according to claim 1, characterized in that: The insulating gasket abuts against the hole wall of the threaded hole.

5. The method according to claim 1, characterized in that The formulation was applied at a thickness of 3 mm.

6. The method according to claim 1, characterized in that After applying the formulation, the method further includes: performing vacuuming to remove air bubbles within the formulation.

7. The method according to claim 1, characterized in that Before injecting the formulation, the method further comprises: sealing the tube opening at one end of the epoxy resin sleeve.

8. The method according to claim 1, characterized in that: Also includes: After the epoxy resin sleeve is coaxially inserted into the steel sleeve, after the threaded hole is opened and / or after the two steel bars are threadedly connected to the insulating connection structure, an insulation test is performed.

9. An insulating connection structure for steel bars, characterized in that: include: Steel casing; coating; an epoxy resin sleeve coaxially disposed in the steel sleeve, wherein the epoxy resin sleeve is tightly bonded to the steel sleeve through the coating; An insulating ring is coaxially arranged in the epoxy resin sleeve, the outer surface of the insulating ring is bonded to the inner surface of the epoxy resin sleeve, and the inner surface of the insulating ring forms a thread structure; An insulating gasket, installed in the insulating ring and dividing the space in the insulating ring; The coating and the insulating ring are cured products of a formulation, and the formulation is prepared from at least epoxy resin, epoxy curing agent and epoxy resin diluent.

10. The insulating connection structure according to claim 9, characterized in that: The formulation is prepared by at least epoxy resin, epoxy curing agent and epoxy resin diluent in a mass ratio of 100:18:

20. The model of the epoxy resin is E-44 6101, and the model of the epoxy curing agent is CYDHD-531.