Integrated densification method and device for screw hole structure

Abstract

The application provides a method and device for integrally filling a pull screw hole structure. The method comprises the following steps: S1, interface pretreatment and sealed cavity construction; S2, connecting of a glue injection device; S3, low-pressure thixotropic glue injection; and S4, plugging and curing. The method and device for integrally filling a pull screw hole structure have the advantages that a dense glue layer without air bubbles and voids can be formed inside the node, and the "rigid integration" connection of a steel plate, a screw and a concrete matrix is realized.

Description

Technical Field

[0001] This invention relates to the field of building reinforcement technology, and in particular to an integrated dense filling method and apparatus for the pore structure of tie rods. Background Technology

[0002] In the field of building structure reinforcement, especially when implementing steel bonding or steel wrapping reinforcement processes, a special connection requirement is often encountered: due to the physical barriers of existing concrete floor slabs, walls, beams, and columns, the steel plates used for reinforcement cannot pass through the structural components (such as beams, slabs, columns, and walls), making it difficult to directly form closed or continuous load-bearing hoops.

[0003] To address this space-constrained issue, the industry commonly employs a "post-drilling and tie rod (reinforcing bar)" connection method. The specific procedure involves drilling holes in the concrete substrate, injecting anchoring adhesive, inserting equivalent reinforcing bars or tie rods, and then fixing the steel plate to both ends of the tie rods (reinforcing bars) by welding (or anchoring with nuts). This achieves a physical connection between the steel plate and the original structure. The core of this process lies not only in achieving a physical connection but also in ensuring that the steel plate, tie rods (reinforcing bars), and concrete form a robust structural whole, effectively transmitting shear and tensile forces.

[0004] Currently, the most common and readily accepted solution in the industry is the traditional rebar anchoring process of "injecting adhesive first, then inserting / welding". The specific procedure is as follows: First, holes are drilled in the concrete. Then, a low-viscosity modified epoxy anchoring adhesive is injected into the holes using a manual or electric injection gun. Next, the screw is quickly rotated and inserted into the hole, using the screw's threaded structure to expel some air and coat the screw surface with adhesive. Finally, a steel plate is welded or anchored to the exposed end of the screw using a nut to complete the reinforcement. However, in actual construction, the compaction of the filling at the connection joints remains a challenge in construction quality control.

[0005] Another similar improvement is the "pre-embedded pipe injection method," which involves pre-embedding sleeves during the early stages of construction. After the concrete is poured, threaded rods are inserted and tightened using nuts at both ends. Finally, a small amount of adhesive is added through a small hole on the side for rust prevention or fine-tuning of the bond. However, this method typically does not involve large-volume structural infill and is mostly used for curtain wall pre-embedding rather than reinforcement of existing structures.

[0006] Traditional rebar adhesives are mostly designed as low-viscosity systems, intended to penetrate concrete micropores to achieve interfacial bonding. However, when used for filling the channels of tie rods, this characteristic becomes a fatal weakness:

[0007] 1. Gravity-induced flow effect: Due to the excessive fluidity of the colloid, when applied in vertical or inclined channels, the colloid is prone to flow and drip due to gravity.

[0008] 2. Air bubbles and hollow areas: The above phenomena directly lead to incomplete filling of the upper part of the hole, forming air bubbles or cavities (i.e., the phenomenon of "empty on top and solid at the bottom").

[0009] 3. Reduced force transmission performance: The internal voids disrupt the continuity of the filler, preventing the tie rods from forming an integrated force-bearing structure with the original structure, thus significantly reducing the load-bearing capacity of the joint.

[0010] Furthermore, traditional techniques have stringent requirements for construction conditions and worker skills, and are extremely inconvenient to operate.

[0011] 1. Complex auxiliary measures: In order to prevent dripping and ensure filling, it is often necessary to install baffles, use segmented glue injection or repeated compaction and other cumbersome auxiliary measures.

[0012] 2. Poor controllability: The high fluidity of the colloid makes it impossible to use pressure injection, and the injection volume and position are difficult to control precisely.

[0013] 3. Waste of resources: During construction, colloids may overflow and be wasted, and cause unnecessary pollution to the environment.

[0014] Furthermore, the hidden dangers caused by inadequate filling will gradually become more apparent after the structure is put into use:

[0015] 1. Corrosive media intrusion: The voids inside the node provide a hiding place for water vapor and corrosive media.

[0016] 2. Screw corrosion and failure: Over time, the internal screw corrodes, and the expansion of the corrosion products further stretches the adhesive layer, leading to the destruction of the bonding interface.

[0017] 3. Shortened structural lifespan: Severe corrosion not only leads to reinforcement failure, but may also damage the concrete protective layer, seriously affecting the safe service life of the structure.

[0018] At the same time, there is an irreconcilable contradiction between the thermal properties of traditional rebar adhesive and the on-site construction procedures:

[0019] 1. Low heat distortion temperature: Traditional epoxy-based rebar adhesives have a low heat distortion temperature (usually only 50°C-80°C).

[0020] Welding heat damage: In the conventional process of "applying adhesive first and then welding", the instantaneous high temperature generated by electric welding (which often exceeds 100°C even when conducted to the adhesive interface) can easily cause the cured adhesive to melt, carbonize or fail, resulting in debonding of the bonding interface and seriously affecting the structural safety.

[0021] Therefore, it is necessary to provide a new method and apparatus for integrated dense filling of the pore structure of tie rods to solve the above-mentioned technical problems. Summary of the Invention

[0022] The technical problem solved by this invention is to provide a method and apparatus for the integrated and dense filling of the pore structure of a tie rod that can form a dense adhesive layer without air bubbles or gaps inside the node, thereby achieving a "rigid integrated" connection between the steel plate, the tie rod and the concrete matrix.

[0023] To solve the above-mentioned technical problems, the present invention provides an integrated dense filling method for the pore structure of a tie rod, comprising the following steps:

[0024] S1. Interface pretreatment and sealing cavity construction: Clean the pores on the concrete substrate and the surface of the tie rods inserted therein, and weld both ends of the tie rods to the reinforcing steel plate; then, construct a sealed filling cavity in the contact area between the tie rods and the concrete substrate, and set an injection port at the lowest point of the filling cavity and an exhaust port at the highest point.

[0025] S2. Connecting the dispensing equipment: Connect the dispensing end of the dispensing equipment to the dispensing port;

[0026] S3, Low-pressure thixotropic injection: Using the injection equipment, inject highly thixotropic epoxy resin into the filling cavity, maintaining the injection pressure at 0.2~0.4MPa until continuous resin overflow is observed from the vent hole;

[0027] S4. Sealing and curing: Sealing the vent holes and injection ports allows the epoxy resin to cure statically within the filling cavity.

[0028] Preferably, in S1, constructing a sealed filling cavity specifically involves: applying quick-drying structural sealant or installing rubber sealing rings / sealing baffles with injection holes and vent holes at both ends of the outer side of the contact surface between the tie rod and the concrete substrate.

[0029] Preferably, in step S3, the epoxy resin is gel-like when at rest and flows in a liquid state when subjected to force.

[0030] The present invention also provides an integrated dense filling device for the pore structure of a tie rod, comprising:

[0031] A sealing member for surrounding the tie rod and forming a filling cavity between it and the concrete matrix;

[0032] The injection port is located at the lowest point of the filling cavity;

[0033] An exhaust port is located at the highest point of the filling cavity;

[0034] The injection port is used to connect to external injection equipment, and the vent is used to expel air from the cavity during the injection process.

[0035] Preferably, the sealing component is a quick-drying structural sealant layer coated on both ends of the contact surface between the tie rod and the concrete.

[0036] Preferably, the sealing component is a rubber sealing ring sleeved on the tie rod or a sealing baffle fixed to the concrete base surface, and the rubber sealing ring or sealing baffle is pre-drilled with the glue injection hole and the vent hole.

[0037] Compared with related technologies, the integrated dense filling method and apparatus for the pore structure of the tie rod provided by the present invention has the following beneficial effects:

[0038] This invention provides an integrated dense filling method and device for the pore structure of tie rods, which can solve the common quality problems of "hollows", "air bubbles" and "upper cavities" in traditional processes, achieving a 100% filling fullness. Utilizing mechanical injection combined with thixotropic adhesive, the construction operation is extremely simple, eliminating the need for complex tamping procedures, greatly reducing labor intensity and improving construction efficiency. The cured epoxy steel-filling adhesive firmly bonds the steel plate, tie rod, and concrete into a rigid whole, ensuring reliable force transmission. Furthermore, the dense adhesive layer isolates moisture and oxygen, significantly enhancing the corrosion resistance and durability of the joint. It is applicable to all steel plate tie rod (reinforcing bar) connections, including those facing upwards, upwards, vertical surfaces, and in confined spaces, thus solving the problem of traditional processes where ordinary adhesives cannot be used. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a preferred embodiment of the integrated dense filling device for the pore structure of a tie rod provided by the present invention.

[0040] Figure 2 for Figure 1 The diagram shows a top-view cross-sectional view of the structure.

[0041] The following are the labels in the diagram: 1. Filling cavity, 2. Injection port, 3. Tie rod, 4. Epoxy steel filler, 5. Reinforcing steel plate, 6. Concrete substrate, 7. Vent hole. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] Please refer to the following: Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of a preferred embodiment of the integrated dense filling device for the pore structure of a tie rod provided by the present invention. Figure 2 for Figure 1 The diagram shows a top-view cross-sectional view of the structure. The integrated dense filling method for the tie rod pore structure includes the following steps:

[0044] Step 1: Interface pretreatment and sealing:

[0045] 1. Hole Cleaning and Rust Removal: First, clean the post-drilled holes on the concrete substrate 6, using a steel brush to remove dust from the hole walls and then blowing them clean with a high-pressure air gun. At the same time, remove rust and grind the surface of the inserted tie rod 3 to ensure a clean and rough surface.

[0046] 2. Positioning and Welding: Position and weld both ends of the tie rod 3 to the reinforcing steel plate 5. After welding, thoroughly clean the weld slag and oil around the weld.

[0047] 3. Constructing a Sealed Cavity: Apply a layer of quick-drying structural sealant to both ends of the contact surface between the tie rod 3 and the concrete substrate 6, and pre-embed the injection tube (at the lowest point) and vent pipe (at the highest point), or install a specially designed rubber sealing ring / sealing baffle (with injection port 2 and vent hole 7). The purpose is to form a sealed, filled cavity 1 between the tie rod 3 and the concrete substrate 6 to prevent sealant leakage during injection.

[0048] Step 2: Connecting the dispensing equipment:

[0049] 1. Equipment selection: Select a two-component dispensing pump (or manual / electric dispensing gun) with a static mixer.

[0050] 2. Piping Connection: Connect the injection tube to the injection port 2 at the lowest point of the sealed cavity. If space is limited, a long and thin injection tube can be pre-embedded. At the same time, reserve or open an vent 7 at the highest point of the cavity.

[0051] Step 3: Low-pressure thixotropic injection:

[0052] 1. Material Preparation: Mix the modified epoxy steel potting compound 4 (component A, main agent, and component B, curing agent) evenly in a ratio of 2:1. This colloid has high thixotropy, meaning it is gel-like and does not flow easily when at rest, but flows in a liquid state when subjected to force.

[0053] 2. Adhesive injection operation: Start the adhesive injection equipment and begin injection at a constant low pressure of 0.2~0.4MPa.

[0054] 3. Air bubble removal: The colloid first fills the bottom of cavity 1. As the colloid is injected, the air inside the cavity is gradually squeezed upwards and discharged from the vent 7 at the top. When continuous colloid overflow is observed from the vent 7, it indicates that the cavity is completely filled and there is no residual air.

[0055] Step 4: Curing and Maintenance

[0056] 1. Seal the vent hole 7: After the adhesive overflows, immediately seal the vent hole 7 and the injection port 2 with quick-drying structural sealant, and maintain pressure for a moment.

[0057] 2. Static curing: Allow the epoxy resin 4 to cure within the sealed cavity at room temperature or under appropriate heating conditions. During the curing process, the resin undergoes slight expansion, further compacting the internal structure.

[0058] 3. Remove the rubber sealing ring / sealing baffle.

[0059] Compared with related technologies, the integrated dense filling method and apparatus for the pore structure of the tie rod provided by the present invention has the following beneficial effects:

[0060] This invention provides an integrated dense filling method and device for the pore structure of tie rods, which can solve the common quality problems of "hollows", "air bubbles" and "upper cavities" in traditional processes, achieving a 100% filling fullness. Utilizing mechanical injection combined with thixotropic adhesive, the construction operation is extremely simple, eliminating the need for complex tamping procedures, greatly reducing labor intensity and improving construction efficiency. The cured epoxy steel-filling adhesive firmly bonds the steel plate, tie rod, and concrete into a rigid whole, ensuring reliable force transmission. Furthermore, the dense adhesive layer isolates moisture and oxygen, significantly enhancing the corrosion resistance and durability of the joint. It is applicable to all steel plate tie rod (reinforcing bar) connections, including those facing upwards, upwards, vertical surfaces, and in confined spaces, thus solving the problem of traditional processes where ordinary adhesives cannot be used.

[0061] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for integrated dense filling of the pore structure of a tie rod, characterized in that, Includes the following steps: S1. Interface pretreatment and sealing cavity construction: Clean the pores on the concrete substrate and the surface of the tie rods inserted therein, and weld both ends of the tie rods to the reinforcing steel plate; then, construct a sealed filling cavity in the contact area between the tie rods and the concrete substrate, and set an injection port at the lowest point of the filling cavity and an exhaust port at the highest point. S2. Connecting the dispensing equipment: Connect the dispensing end of the dispensing equipment to the dispensing port; S3, Low-pressure thixotropic injection: Using the injection equipment, inject highly thixotropic epoxy resin into the filling cavity, maintaining the injection pressure at 0.2~0.4MPa until continuous resin overflow is observed from the vent hole; S4. Sealing and curing: Sealing the vent holes and injection ports allows the epoxy resin to cure statically within the filling cavity.

2. The integrated dense filling method for the pore structure of the tie rod according to claim 1, characterized in that, In S1, the construction of the sealed filling cavity specifically involves: applying quick-drying structural sealant or installing rubber sealing rings / sealing baffles with injection holes and vent holes at both ends of the outer side of the contact surface between the tie rod and the concrete substrate.

3. The integrated dense filling method for the pore structure of the tie rod according to claim 1, characterized in that, In S3, the epoxy steel potting compound is in a gel state when at rest and in a liquid state when subjected to force.

4. A device for integrating and compacting the pore structure of a tie screw for implementing the integrated compacting method for the pore structure of a tie screw as described in any one of claims 1-3, characterized in that, include: A sealing member for surrounding the tie rod and forming a filling cavity between it and the concrete matrix; The injection port is located at the lowest point of the filling cavity; An exhaust port is located at the highest point of the filling cavity; The injection port is used to connect to external injection equipment, and the vent is used to expel air from the cavity during the injection process.

5. The integrated dense filling device for the pore structure of the tie screw according to claim 4, characterized in that, The sealing component is a quick-drying structural sealant layer coated on both ends of the contact surface between the tie rod and the concrete.

6. The integrated dense filling device for the pore structure of the tie screw according to claim 5, characterized in that, The sealing component is a rubber sealing ring sleeved on the tie rod or a sealing baffle fixed to the concrete base surface. The rubber sealing ring or sealing baffle is pre-drilled with the glue injection hole and the vent hole.

Images