A construction method of a welding embedded part

Abstract

The application discloses a construction method of a bolt welding embedded part, which comprises the following steps: constructing a groove on the surface of a base body; constructing a base body positioning hole in the groove; fixing an anchor rod in the base body positioning hole; filling a foamed body into the groove, and the anchor rod penetrates through the foamed body; arranging an anchoring plate on the foamed body, and the anchor rod penetrates through the plate body positioning hole of the anchoring plate; injecting cooling water into the foamed body; welding the anchor rod and the anchoring plate; cutting off the part of the anchor rod which extends out of the anchoring plate; taking out the foamed body in the groove; removing the cooling water in the groove; and filling a pouring body into the groove. The method has the beneficial effects that the groove is filled with the foamed body containing saturated ice water, so that the high temperature generated in the anchor rod during welding is absorbed by the ice water and is not transmitted to the structural glue, and the adverse effects of the high temperature during the welding of the conventional post-embedded part are solved; the grouting material or the fine stone concrete is used to fill the groove, and the complete anchoring structure body is formed, and the functional requirement that the fixing interface is a plane is solved.

Description

Technical Field

[0001] This invention belongs to the field of industrial and civil buildings and structures, and specifically relates to a construction structure for a welded anchor for reinforcing bars. Background Technology

[0002] Embedded parts are divided into pre-embedded parts and post-embedded parts. They are components installed within concealed works for the installation and fixation of subsequent components. Pre-embedded parts are installed before the structural concrete is poured, while post-embedded parts are installed after the structural concrete is poured. Embedded parts consist of anchor plates (steel plates) and anchor rods (anchor bars or anchor bolts). Pre-embedded parts are installed by welding the anchor plates and anchor rods together as a whole within the concealed works before pouring the concrete together. Post-embedded parts are installed after the concealed works have been poured, using post-anchoring techniques such as rebar installation or chemical anchors. In actual engineering, due to various reasons, it is often necessary to install embedded parts after the concealed works are completed. Therefore, post-embedded parts are more common in engineering practice, especially in industrial engineering construction.

[0003] Because rebar anchoring and chemical anchors require the use of structural adhesive, and the high temperatures of welding can significantly weaken the anchoring performance of the adhesive, the "Code for Strengthening Concrete Structures" recommends using post-installed anchors, as shown in the attached document. Figure 1 As shown, the anchor plate 3 is fixed by external force using threaded portion 4 and nut 5. However, in engineering, the surface of the embedded part often needs to be a flat plane. The threaded portion 4 and nut 5 protruding from the steel plate surface in the post-installed anchor bolt part will affect its functionality. Post-installed anchor bar parts do not have this problem, but they require welding, as shown in the attached diagram. Figure 2 As shown, conventional post-installed anchorages, due to the high temperature generated by welding the anchorage to the steel plate, significantly weaken the anchoring performance of the structural adhesive, thus affecting the durability of the structure.

[0004] To prevent the high temperature and current generated during welding from weakening the anchoring effect of the structural adhesive and thus affecting the durability of the structure, it is necessary to develop a post-embedded component that can both ensure the mechanical properties of the embedded component and meet the functional requirements. Summary of the Invention

[0005] The purpose of this invention is to provide a construction structure for welded rebar embedding, which solves the problem that welding connections of existing post-installed embeddings affect anchoring performance.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A construction method for welded anchor parts for rebar includes the following steps:

[0008] Step 1: Create grooves on the surface of the substrate;

[0009] Step 2: Construct positioning holes for the substrate within the groove;

[0010] Step 3: Fix the anchor rod in the positioning hole of the base;

[0011] Step 4: Fill the groove with foam, and pass the anchor rod through the foam.

[0012] Step 5: Install anchor plates on the foam body, and pass the anchor rods through the positioning holes of the anchor plates.

[0013] Step 6: Inject cooling water into the foam.

[0014] Step 7: Weld the anchor rod to the anchor plate and use cooling water to absorb the heat generated during welding.

[0015] Step 8: Cut off the portion of the anchor bolt that extends beyond the anchor plate;

[0016] Step 9: Remove the foam from the groove;

[0017] Step 10: Remove the cooling water from the groove;

[0018] Step 11: Fill the groove with the cast-in-place material and cure the cast-in-place material. The cast-in-place material wraps around the anchor rod and supports the anchor plate.

[0019] In step 1, the surface of the substrate is chiseled to create a rectangular groove.

[0020] In step 2, four base positioning holes are drilled at the bottom of the groove, and the base positioning holes are distributed at the four corners of the rectangle.

[0021] In step 3, the anchor rod is either a rebar or a chemical anchor, and the anchor rod is fixed in the positioning hole of the substrate with structural adhesive.

[0022] In step 4, the foam is water-absorbing foam, and the outer surface of the foam is flush with the outer surface of the substrate.

[0023] In step 5, the anchor plate is a rectangular steel plate to ensure that the anchor rod and the anchor plate are perpendicular to each other.

[0024] In step 6, ice water is used as the cooling water, and the porous structure within the foam adsorbs the cooling water.

[0025] In step 7, the anchor rod and the anchor plate are connected by through-hole plug welding.

[0026] In step 11, the casting body is grout or fine aggregate concrete. The casting body provides anchoring force to the anchor rod or does not provide anchoring force, and ensures that the outer surface of the casting body is flush with the outer surface of the base.

[0027] It also includes step 12, which involves grinding the surface of the anchor plate smooth.

[0028] The beneficial effects of this invention are:

[0029] 1. A groove of a certain depth and width is chiseled between the starting end of the adhesive and the welding position of the anchor plate. Before welding the anchor rod to the anchor plate, the groove is filled with foam containing saturated ice water. This allows the high temperature generated in the anchor rod during welding to be absorbed by the ice water and not transferred to the structural adhesive, thus solving the adverse effects of high temperature during conventional post-installed embedded part welding.

[0030] 2. After the anchor rod and anchor plate are welded, remove the ice water foam and use dry foam to absorb the water remaining in the groove. Then fill the groove with grout or fine stone concrete to form a complete anchor structure, which solves the functional requirement of fixing the interface to a plane.

[0031] The aforementioned main solution of the present invention and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed by the present invention; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding the solution of the present invention, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected by the present invention, and will not be exhaustively listed here. Attached Figure Description

[0032] Figure 1 This is a structural schematic diagram of the post-installed anchor bolt.

[0033] Figure 2 This is a schematic diagram of the structure of the post-installed anchor bar.

[0034] Figure 3 This is a schematic diagram of the construction of the groove of the present invention.

[0035] Figure 4 This is a schematic diagram of the construction of the positioning holes in the substrate of the present invention.

[0036] Figure 5 This is a schematic diagram of the construction of the anchor bolt of the present invention.

[0037] Figure 6 This is a schematic diagram of the construction of the foam body of the present invention.

[0038] Figure 7 This is a schematic diagram of the construction of the positioning holes on the plate of the present invention.

[0039] Figure 8 This is a construction diagram of the anchor plate of the present invention.

[0040] Figure 9 This is a schematic diagram of the construction of the cooling water system of this invention.

[0041] Figure 10 This is a construction schematic diagram of the welding of the anchor rod and the anchor plate of the present invention.

[0042] Figure 11 This is a construction diagram of the anchor bolt cutting process of the present invention.

[0043] Figure 12 This is a schematic diagram of the construction process for removing the foam body according to the present invention.

[0044] Figure 13 This is a construction schematic diagram of the casting body of the present invention.

[0045] Figure 14 This is a construction diagram of grinding the anchor plate according to the present invention.

[0046] In the diagram: 1-substrate, 2-anchor rod, 3-anchor plate, 4-threaded part, 5-nut, 6-welded part, 7-groove, 8-substrate positioning hole, 9-plate positioning hole, 10-foam body, 11-cooling water, 12-cast body. Detailed Implementation

[0047] The following non-limiting examples are used to illustrate the present invention.

[0048] Example 1:

[0049] refer to Figures 3 to 14 As shown, a construction method for a welded anchor for reinforcing bars includes the following steps: Step 1, a groove 7 is constructed on the surface of the substrate 1. Specifically, the groove 7 is constructed by chiseling on the surface of the substrate 1. The constructed groove 7 is a rectangular groove. The substrate 1 is a pre-cast structure. The groove 7 provides space for the arrangement of the foam body 10 and the cast body 12, ensuring that the grooves constructed before and after have different components to perform different functions.

[0050] Step 2: Construct base positioning holes 8 in the groove 7. Drill four base positioning holes 8 at the bottom of the groove 7. The base positioning holes 8 are arranged vertically and distributed at the four corners of the rectangle. The base positioning holes 8 provide a foundation for the fixed arrangement of the anchor rod 2.

[0051] Step 3: Fix anchor rods 2 in each base positioning hole 8. Anchor rods 2 are either rebar anchors or chemical anchors. Anchor rods 2 are fixed in the base positioning hole 8 with structural adhesive, thereby forming four anchor rods 2 arranged in a rectangle. Anchor rods 2 are mainly used to anchor in the base 1 and to fix the anchor plate 3.

[0052] Step 4: Fill the groove 7 with foam 10. Foam 10 is water-absorbing foam and is a porous material to absorb the internal cooling water 11. Since the anchor rod 2 has a length allowance, it passes through the foam 10. Furthermore, the outer surface of the foam 10 is flush with the outer surface of the base 1 to prevent the foam 10 from interfering with the placement of the anchor plate 3.

[0053] Step 5: Install anchor plate 3 on foam body 10. Anchor plate 3 is a rectangular steel plate. Beforehand, holes are drilled on anchor plate 3 to mark the rebar positions. After anchor plate 3 is installed, anchor rod 2 passes through the positioning hole 9 of anchor plate 3 and extends out of anchor plate 3. Temporarily spot weld anchor rod 2 to anchor plate 3 to ensure that anchor rod 2 and anchor plate 3 are perpendicular to each other. Ensure that anchor plate 3 is also installed on the outer surface of base body 1 to avoid excessive outward extension of anchor plate 3.

[0054] Step 6: Inject cooling water 11 into the foam 10. The cooling water 11 is ice water, which has a better heat absorption effect. The porous structure inside the foam 10 adsorbs the cooling water 11.

[0055] Step 7: Weld the anchor rod 2 to the anchor plate 3. The anchor rod 2 and the anchor plate 3 are fixed by through-hole plug welding. Cooling water 11 is used to absorb the heat generated by welding to avoid the high temperature from being transmitted downwards and having an adverse effect on the structural adhesive.

[0056] Step 8: Cut off the portion of the anchor rod 2 that extends beyond the anchor plate 3 to ensure that the surface of the anchor plate 3 is flat.

[0057] Step 9: Remove the foam body 10 from the groove 7.

[0058] Step 10: Remove the cooling water 11 from the groove 7 to prepare for the subsequent pouring of the casting body 12.

[0059] Step 11: Fill the groove 7 with the casting body 12, which is grout or fine stone concrete, and cure the casting body 12. The casting body 12 wraps the anchor rod 2 and supports the anchor plate 3. The casting body 12 provides anchoring force to the anchor rod 2 or does not provide anchoring force, and ensures that the outer surface of the casting body 12 is flush with the outer surface of the base 1, so as to realize the support of the anchor plate 3 by the casting body 12.

[0060] Step 12: Grind the surface of the anchor plate 3 until it is smooth to meet the functional requirement of fixing the interface to be a plane.

[0061] The anchorage bearing capacity of the anchor bolt = bearing capacity of the colloid section + bearing capacity of the cast-in-place section. Alternatively, only the bearing capacity of the colloid section can be used, with the cast-in-place section serving as a safety reserve, depending on the length of the cast-in-place section and the specific circumstances.

[0062] Taking a post-installed anchor system used in a certain project as an example: the anchor plate 3 is 300mm x 200mm in size, and there are 4 Φ12 anchor rods, each 336mm long. If M12 Hilti mechanical anchors are used, each costs 100 yuan, and the total cost of the anchor system is about 430 yuan. If Φ12 rebar is used, each costs 15 yuan, and the total cost of the anchor system is about 90 yuan, which can save 80% of the cost.

[0063] The foregoing basic examples and their further alternative examples of the present invention can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed by the present invention. In the present invention, each alternative example can be arbitrarily combined with any other basic example and alternative example.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of constructing a welded-in anchor, characterized in that It comprises the following steps: Step 1: a groove (7) is constructed on the surface of the base (1), and the outer contour of the groove is larger than that of the anchoring plate; Step 2: a base positioning hole (8) is constructed in the groove (7); Step 3: an anchor rod (2) is fixed in the base positioning hole (8); Step 4: a foam body (10) is filled into the groove (7), and the anchor rod (2) penetrates through the foam body (10); Step 5: an anchoring plate (3) is arranged on the foam body (10), and the anchor rod (2) penetrates through the plate positioning hole (9) of the anchoring plate (3); Step 6: cooling water (11) is injected into the foam body (10); Step 7: the anchor rod (2) and the anchoring plate (3) are welded, and the cooling water (11) absorbs the heat generated by welding; Step 8: the part of the anchor rod (2) protruding from the anchoring plate (3) is cut off; Step 9: the foam body (10) in the groove (7) is taken out; Step 10: the cooling water (11) in the groove (7) is removed; Step 11: a pouring body (12) is filled into the groove (7), and the pouring body (12) is cured, the pouring body (12) wraps the anchor rod (2) and supports the anchoring plate (3).

2. The method of claim 1, wherein: In step 1, the groove (7) constructed on the surface of the base (1) is a rectangular groove.

3. The method of claim 1, wherein: In step 2, four base positioning holes (8) are drilled at the bottom of the groove (7), and the base positioning holes (8) are distributed at the four corners of the rectangle.

4. The method of claim 1 or 3, wherein: In step 3, the anchor rod (2) is a reinforcing bar or a chemical anchor, and the anchor rod (2) is fixed in the base positioning hole (8) through structural glue.

5. The method of claim 1, wherein: In step 4, the foam body (10) is water-absorbing foam, and the outer surface of the foam body (10) is flush with the outer surface of the base (1).

6. The method of claim 1 or 2, wherein: In step 5, the anchoring plate (3) is a rectangular steel plate, and the anchoring plate (3) is perpendicular to the anchor rod (2).

7. The method of claim 1 or 5, wherein: In step 6, the cooling water (11) is ice water, and the porous structure of the foam body (10) adsorbs the cooling water (11).

8. The method of claim 1, wherein: In step 7, the anchor rod (2) and the anchoring plate (3) are welded by hole plug welding.

9. The method of claim 1, wherein: In step 11, the pouring body (12) is grouting material or fine stone concrete, the pouring body (12) provides anchoring force or does not provide anchoring force for the anchor rod (2), and the outer surface of the pouring body (12) is flush with the outer surface of the base (1).

10. The method of claim 1, wherein: It further comprises step 12: polishing the surface of the anchoring plate (3) flat.

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