A method of using a bar anchoring and glue injecting device

Abstract

A method for using a rebar injection device includes a site cleaning and positioning device. The site cleaning device is used to clean the original concrete structure surface where rebar needs to be injected. It also includes a drilling device for mechanically drilling holes according to predetermined positions; a hole cleaning device for blowing away dust from the holes and using a special brush to clean the hole walls, ensuring the holes are clean, dry, and free of water; a rebar treatment device for removing rust and other contaminants from the rebar surface; and an injection device, including a grouting nozzle or syringe, for injecting rebar injection adhesive into the drilled holes. The rebar injection device performs the injection immediately after the adhesive is applied. The rebar injection device includes a fixing device that is fitted onto the inserted rebar and supported on the ground. The diameter of the central hole of the fixing device is larger than the outer diameter of the rebar, with an interference fit between them. This method of using the rebar injection device enables more stable bonding and fixing of the rebar.

Description

Technical Field

[0001] This invention relates to the field of rebar injection, and in particular to a method of using a rebar injection device. Background Technology

[0002] Rebar anchoring with adhesive is a construction method that involves drilling holes in concrete or other poured surfaces to insert reinforcing bars. Also known as rebar planting, it is a post-anchoring connection technique in seismic reinforcement of building structures, utilizing the locking and holding force of structural adhesive. For buildings requiring re-casting or reinforcement, rebar anchoring with adhesive is the optimal choice for structural reinforcement and heavy-load fastening.

[0003] There are multiple methods for injecting adhesive into rebar anchoring. Currently, the most commonly used method is the chemical anchoring method, which involves drilling holes in the substrate such as concrete, wall, or rock, and then injecting high-strength anchoring adhesive to achieve high-strength anchoring. Class A modified epoxy adhesive is typically used for this process.

[0004] Caissons are the main structure in the construction of wharves and ports. Because they are close to the coast or located in the sea, their construction is easily affected by tides. When installing and grouting the rebar on the caisson cover plate, it is necessary to take various protective measures such as waterproofing and preventing loosening to ensure that the rebar on the caisson cover plate can obtain stable and consistent strength. Summary of the Invention

[0005] The purpose of this invention is to provide a method for using a rebar injection device that can ensure the stability and consistency of rebar installation.

[0006] The technical solution adopted in this invention is as follows: A method for using a rebar injection device, including a site cleaning and positioning device, wherein the site cleaning device is used to clean the surface of the original concrete structure to be injected with rebar; a drilling device is also included, used to mechanically drill holes according to predetermined hole positions; a hole cleaning device is also included, used to blow away dust from the holes and use a special brush to clean the hole walls to ensure that the holes for rebar injection are clean, dry and free of water accumulation; a rebar treatment device is used to remove rust and other dirt from the surface of the rebar; an injection device includes an injector or syringe to inject rebar injection adhesive into the drilled holes; the rebar injection device performs injection immediately after injection; the rebar injection device includes a fixing device, which is sleeved on the inserted rebar and supported on the ground, wherein the diameter of the central hole of the fixing device is larger than the outer diameter of the rebar, and the two are interference-fitted.

[0007] Furthermore, the on-site cleaning device includes a hot air blower, which is used to blow away the accumulated water on the caisson cover plate to keep the caisson cover plate dry; the positioning device includes an alignment device for marking the location where rebar needs to be installed, and a positioning stamp, which is pre-engraved with the diameter and depth information of the rebar to be installed, and the positioning stamp is affixed at the positioning location of the alignment device.

[0008] Furthermore, the drilling device also includes an eccentric drilling device for machining several sections with enlarged diameters in the borehole; the enlarged diameter sections are evenly distributed along the depth direction of the borehole.

[0009] Furthermore, first, a hole of a certain depth is drilled using a regular drill bit. Then, an eccentric drill bit is used to drill an enlarged portion of the hole. Subsequently, a hole of a certain depth is drilled using a regular drill bit, and then another enlarged portion of the hole is drilled using an eccentric drill bit. This process is repeated several times.

[0010] Furthermore, the fixing device includes a support base and legs located below the support base. The support base is generally cylindrical in shape and has a through central hole. The diameter of the central hole is slightly larger than the diameter of the reinforcing bar, allowing the reinforcing bar to be inserted into it. The diameter of the central hole is smaller than the diameter of the drilled hole. The legs are generally A-shaped, with one side of the A-shaped leg extending towards the center and the other side extending away from the center. Multiple legs are arranged around the bottom of the cylindrical support base.

[0011] Furthermore, the fixing device includes a cylindrical support base and a supporting cylinder extending downward along the support base. The support base and the supporting cylinder are concentrically arranged and have a central hole passing through them. The diameter of the supporting cylinder is smaller than the diameter of the support base, and the lower part of the support base is connected to the supporting cylinder by an inclined surface. The diameter of the supporting cylinder is smaller than the inner diameter of the drill hole so that it can be inserted into the drill hole. The length of the supporting cylinder ensures that it can be inserted into the drill hole and ensures a certain degree of stability. The diameter of the through hole is slightly larger than the diameter of the reinforcing bar.

[0012] Furthermore, a hole of a predetermined depth is drilled using a conventional drill bit, and then an eccentric drill bit is used to penetrate to the predetermined depth position in the hole to machine a section of enlarged hole diameter downwards, ensuring that the enlarged hole diameter sections are spaced a sufficiently large distance from each other.

[0013] Furthermore, the borehole should be dried before rebar installation, and a hot air blower should be used to clean the borehole.

[0014] Furthermore, after the adhesive is applied, dip the processed rebar into a small amount of adhesive and slowly insert it into the anchoring hole. While inserting the rebar, rotate it several times in a certain direction to ensure that the adhesive adheres tightly to the rebar and the surface of the hole. When inserting the rebar, rotate it in one direction to insert it into the bottom of the hole to prevent gas from being trapped inside the hole.

[0015] Furthermore, it also includes a hole-sealing device, used to seal the cleaned hole tightly after cleaning the drilled hole to prevent dust and foreign objects from falling in and contaminating the hole.

[0016] This invention uses a drying device to clean and dry the drilled holes, ensuring that the caisson cover plate is not corroded by seawater during adhesive application. By using a hole-enlarging method, several annular grooves are machined in the drilled holes, allowing more adhesive to be injected and providing stronger adhesion to the anchor bars in the radial direction. A fixing device is used to fix the anchor bars a second time, which can withstand the impact of sea waves and sea winds, making the anchor bars more stable. Attached Figure Description

[0017] Figure 1 This is a flowchart of the rebar installation process of the rebar installation device described in this invention;

[0018] Figure 2 This is a schematic diagram of the drilling cross-section of a rebar planting device according to the present invention;

[0019] Figure 3 This is a structural schematic diagram of the fixing device of the planting rebar device according to the present invention;

[0020] Figure 4 This is a structural schematic diagram of the fixing device of another embodiment of the planting rebar device described in this invention. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] refer to Figure 1 The rebar injection method of the present invention is as follows: Figure 1 As shown, the process includes steps such as site cleaning and positioning, drilling, hole cleaning, rebar cutting, rebar rust removal, adhesive preparation, adhesive injection, rebar installation, and curing. Among these, site cleaning and positioning, drilling, hole cleaning, rebar cutting, rebar rust removal, and adhesive preparation can be performed simultaneously, saving a significant amount of time.

[0023] The method of using the rebar injection device of the present invention includes a site cleaning and positioning device. The site cleaning device is used to clean the surface of the original concrete structure where rebar needs to be injected. The site cleaning device includes a hot air blower, which is used to blow away the water accumulated on the caisson cover plate to keep the caisson cover plate as dry as possible. The positioning device includes an alignment device for marking the location where rebar needs to be injected, and a positioning stamp. The positioning stamp is pre-engraved with the diameter and depth information of the rebar to be injected, and the positioning stamp is affixed at the positioning location of the alignment device.

[0024] It also includes drilling equipment: mechanical drilling is performed according to the predetermined hole positions, and the drilling depth is determined according to the anchoring depth required by the drawings: the depth in the vertical direction of the top of the caisson partition wall and the horizontal direction of the wharf breast wall is 550mm, and the hole diameter is 28mm. Generally, pneumatic drills or water drills are used, perpendicular to the plane of the concrete component, with an inclination angle of no more than 8°.

[0025] When drilling, avoid the existing structural steel reinforcement, and the depth of some holes should be determined according to the actual site conditions.

[0026] The drilling apparatus also includes an eccentric drilling device for machining several sections with enlarged diameters in a pre-drilled hole.

[0027] During processing, a standard drill bit is first used to drill a hole to a certain depth. Then, an eccentric drill bit is used to drill an enlarged section of the hole. The standard drill bit is then used again to drill a hole to a certain depth, and the eccentric drill bit is used again to drill another enlarged section of the hole. This process is repeated several times to create a hole with several enlarged sections. The enlarged section can also be understood as a transverse annular groove set along the depth direction of the drill hole.

[0028] In another embodiment, a hole of a predetermined depth can be drilled first using a conventional drill bit, and then an eccentric drill bit can be used to penetrate to the predetermined depth in the hole 1 to machine a section of enlarged diameter 2 downwards. During machining, it should be ensured that the enlarged diameter sections are spaced sufficiently far apart to guarantee the strength of the hole wall.

[0029] refer to Figure 2 The enlarged aperture portion is evenly distributed along the depth direction of the drill hole. The depth of the enlarged aperture portion is approximately in the range of 1-3cm. It should not be too large to avoid affecting the strength of the drill hole, nor should it be too small to avoid affecting the adhesion of the adhesive.

[0030] The presence of the enlarged aperture portion 2 allows the adhesive to be injected into the enlarged aperture portion when glue is applied. After the adhesive solidifies, the cured adhesive hardens in the enlarged aperture portion and firmly adheres to the hole wall, thereby increasing the axial bonding force to the reinforcing bar.

[0031] This also includes hole cleaning equipment: The "four-blow, three-brush" method is used for hole cleaning. First, blow away the surface dust, then use a special brush to clean the hole walls. While brushing, the brush is pulled and rotated inside the hole, repeating this blowing and brushing process until all dust is removed. It is strictly forbidden to flush the holes with water. The holes for rebar installation should be thoroughly cleaned, dry, and free of standing water. After cleaning, the next construction step can only proceed after the construction team's self-inspection is passed and the project's technical and quality inspection departments have approved the work. Generally, high-pressure air or high-pressure water flushing is used. When using high-pressure water flushing, the hole should be dry before rebar installation. Alternatively, a hot air blower can be used to clean the holes.

[0032] For rebar treatment, the anchored portion of the rebar must be free of rust and other contaminants. Generally, an angle grinder with a wire brush is used for rust removal, grinding until the metal shines through. The rust removal length should be approximately 50mm longer than the anchorage length. Severely rusted rebar cannot be used for rebar installation. The rebar surface must be rust-removed, and bolts must be fully threaded.

[0033] Adhesive injection device: The adhesive used for rebar anchoring should be injected using a specialized injector or syringe. Grade A modified epoxy adhesive should be used, and the injection into the hole should be complete, meeting the following requirements:

[0034] (1) The grouting method should not hinder the air from being discharged from the hole.

[0035] (2) The amount of grout should be such that a small amount of adhesive overflows after the steel bar is implanted.

[0036] (3) The adhesive used for anchoring should not be used for anchoring after it has initially hardened.

[0037] Rebar installation: This should be done immediately after adhesive injection. To ensure the hole is fully filled with adhesive, after injection, dip the prepared rebar end in a small amount of adhesive and slowly insert it into the hole. While inserting, rotate the rebar several times in a specific direction to ensure a tight bond between the adhesive and the rebar and the hole wall. Insert the rebar to the deepest point in the hole and ensure it remains undisturbed for 24 hours. The hole should be fully filled with adhesive to avoid gaps. When inserting the rebar, rotate it in one direction to the bottom of the hole to prevent air from accumulating inside.

[0038] refer to Figure 3 The rebar anchoring device also includes a fixing device, which includes a support base 4 and legs 41 located below the support base 4. The support base is approximately cylindrical in shape and has a through central hole. The diameter of the central hole is slightly larger than the diameter of the rebar, allowing the rebar to be inserted. The diameter of the central hole is smaller than the diameter of a drilled hole. The legs 41 are approximately A-shaped, with one side extending towards the center and the other side extending away from the center. Multiple legs 41 are arranged around the bottom of the cylindrical support base. Thus, when the fixing device is fitted onto the rebar, regardless of which direction a pushing force is applied to the fixing device, a reaction force is applied to it from the opposite side of the applied force direction, thereby firmly fixing the rebar.

[0039] In use, first insert the reinforcing bar into the drilled hole, then slip the fixing device over the reinforcing bar from above and support it on the ground. Adjust the position of the reinforcing bar to ensure it is vertical. After the adhesive has cured, remove the fixing device upwards along the reinforcing bar's axis for reuse. During use, care should be taken to prevent the adhesive from sticking to the legs 41 of the fixing device; therefore, the height of the legs 41 should be sufficient to ensure they do not come into contact with any adhesive overflowing from the drilled hole. If the legs come into contact with the adhesive, use tools to clean it promptly.

[0040] refer to Figure 4 This illustrates another embodiment of the fixing device of the present invention.

[0041] In this embodiment, the fixing device includes a cylindrical support base 4 and a supporting cylinder 42 extending downward along the support base 4. The support base 4 and the supporting cylinder 42 are concentrically arranged and have a through hole connecting them. The diameter of the supporting cylinder 42 is smaller than the diameter of the support base 4, and the lower part of the support base 4 is transitionally connected to the supporting cylinder 42 via an inclined surface 43. The diameter of the supporting cylinder 42 is smaller than the inner diameter of the drill hole 1, so it can be inserted into the drill hole. The length of the supporting cylinder 42 should not be too long, just enough to ensure a certain stability when inserted into the drill hole; for example, its length can be 1-5 cm. The diameter of the through hole is slightly larger than the diameter of the reinforcing bar.

[0042] In use, first insert the reinforcing bar into the drilled hole to complete the rebar installation. Then, slip the fixing device over the reinforcing bar and insert it into the drilled hole. Ensure there is sufficient rebar adhesive in the drilled hole, allowing it to overflow between the outer wall of the supporting cylinder 42 and the inner wall of the drilled hole, with a small amount overflowing. The overflowing adhesive will fill the space between the supporting cylinder 42 and the supporting base 4, and between the supporting inclined surface 43, thus bonding the supporting device to the cover plate surface. Observe whether the through hole and the reinforcing bar are completely filled with rebar adhesive. If not, add more adhesive to secure the reinforcing bar to the fixing device. Simultaneously, fill the space between the inclined surfaces 43 with rebar adhesive, ensuring it is completely filled.

[0043] Thus, the fixing device is bonded and fixed to the drilled hole, and the fixing device and the reinforcing bar also remain bonded and fixed, with all three firmly fixed together. Using this method, the fixing device and the reinforcing bar are subsequently poured into the concrete together, without being recycled. This method achieves better rebar strength and is also faster during construction.

[0044] During curing, the anchoring rebars must not be touched before the adhesive has fully cured. The curing time of the anchoring adhesive should be determined according to the product instructions. After the anchoring adhesive has fully cured and passed the project's technical and quality inspection, it should be submitted to the client and supervisor for inspection. The next construction process can only proceed after the client and supervisor have approved it. During the curing period, it is strictly forbidden to disturb the bolts or rebars.

[0045] Considering the influence of tides, vertical rebar installation cannot be carried out on the longitudinal and transverse partition walls of the caisson when the tide level is high and submerges the top of the caisson. Therefore, to make full use of time, when the tide level drops below the horizontal rebar installation position on the wharf breast wall (elevation 1.25m), workers immediately begin drilling holes for horizontal rebar installation on the wharf breast wall until the tide level exposes the top of the caisson. Then, vertical holes are drilled at the top of the caisson partition walls. After completing a section of vertical drilling, rebar installation should be carried out promptly to prevent the rebar holes from being submerged by rising tide, which would require secondary hole cleaning, drying, and rework.

[0046] 1) After cleaning the hole, seal it tightly with clean cotton thread to prevent dust and foreign objects from falling in and contaminating the hole.

[0047] 2) After rust removal and cleaning, the reinforcing bars should be placed in a dry place, and the polished parts of the reinforcing bars should be wrapped and protected to prevent contamination.

[0048] 3) Protect the installed steel bars to prevent them from being swayed or bumped during the curing time of the adhesive.

[0049] Since the caisson cover plate will be submerged by the tide, it is especially important to fix the rebar. This invention uses a fixing device to fix the rebar for a second time, which can withstand the impact of sea waves and sea winds, making the rebar more stable.

[0050] The above description is only 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 using an adhesive dispensing apparatus, comprising: The system includes a site cleaning device and a positioning device. The site cleaning device is used to clean the original concrete structure surface where rebar needs to be installed. It also includes a drilling device for mechanically drilling holes according to predetermined positions; a hole cleaning device for blowing away dust from the holes and using a special brush to clean the hole walls, ensuring the holes are clean, dry, and free of water; a rebar treatment device for removing rust and other contaminants from the rebar surface; and an adhesive injection device, including a grouting device or syringe, for injecting rebar adhesive into the drilled holes. The rebar installation device immediately performs the rebar installation after the adhesive injection. The rebar installation device includes a fixing device, which is fitted onto the installed rebar and supported on the ground. The diameter of the through hole in the fixing device is larger than the outer diameter of the rebar, and the two are interference-fitted. The fixing device includes a cylindrical support base and a support along the... The support base extends downwards into a supporting cylinder. The support base and the supporting cylinder are concentrically arranged and have a through hole connecting them. The diameter of the supporting cylinder is smaller than the diameter of the support base, and the lower part of the support base is connected to the supporting cylinder via an inclined surface. The diameter of the supporting cylinder is smaller than the inner diameter of the drill hole so that it can be inserted into the drill hole. The length of the supporting cylinder ensures that it can be inserted into the drill hole and ensures a certain degree of stability. The diameter of the through hole is slightly larger than the diameter of the reinforcing bar. In use, the reinforcing bar is inserted into the drill hole to complete the rebar installation. Then, the fixing device is inserted from above the reinforcing bar and inserted into the drill hole. Sufficient rebar adhesive should be provided in the drill hole so that the rebar adhesive can overflow between the outer wall of the supporting cylinder and the inner wall of the drill hole, with a small amount overflowing from the drill hole. The rebar adhesive overflowing from the drill hole will fill the space between the supporting cylinder and the support base.

2. The method of using the rebar injection device according to claim 1, characterized in that, The on-site cleaning device includes a hot air blower, which is used to blow away the accumulated water on the caisson cover plate and keep the caisson cover plate in a dry state; the positioning device includes an alignment device, which marks the location where the rebar needs to be installed, and a positioning stamp, which is pre-engraved with the diameter and depth information of the rebar to be installed, and the positioning stamp is affixed at the positioning location of the alignment device.

3. The method of using the rebar injection device according to claim 1 or 2, characterized in that, The drilling device also includes an eccentric drilling device for machining several sections with enlarged diameters in the borehole; the enlarged diameter sections are evenly distributed along the depth direction of the borehole.

4. The method of using the rebar injection device according to claim 1 or 2, characterized in that, First, use a regular drill bit to drill a hole to a certain depth. Then, switch to an eccentric drill bit to drill an enlarged section of the hole. Next, use a regular drill bit to drill another hole to a certain depth. Then, switch to an eccentric drill bit again to drill another enlarged section of the hole. Repeat this process several times.

5. The method of using the rebar injection device according to claim 4, characterized in that, A hole of a predetermined depth is drilled using a conventional drill bit. Then, an eccentric drill bit is used to penetrate to the predetermined depth within the hole to machine a section of enlarged diameter, ensuring that the enlarged diameter sections are spaced sufficiently far apart from each other.

6. The method of using the rebar injection device according to claim 5, characterized in that, The borehole should be dry before rebar installation, and a hot air blower should be used to clean the borehole.

7. The method of using the rebar injection device according to claim 6, characterized in that: After the adhesive is applied, dip the processed rebar into a small amount of adhesive and slowly insert it into the anchoring hole. While inserting the rebar, rotate it several times in a certain direction to ensure that the adhesive adheres tightly to the rebar and the surface of the hole. When inserting the rebar, rotate it in one direction to insert it into the bottom of the hole to prevent gas from being trapped inside the hole.

8. The method of using the rebar injection device according to claim 7, characterized in that: It also includes a hole-sealing device, which is used to seal the cleaned hole tightly after cleaning the drill hole to prevent dust and foreign objects from falling in and contaminating the hole.

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