Inclined secondary structure embedded steel bar construction method

Abstract

The invention discloses an inclined secondary structure embedded steel bar construction method which comprises the following steps: S1, designing and optimizing an embedded steel bar point position and depth by using software; s2, a drilling machine is used for forming holes in the steel bar planting point positions in an inclined mode; s3, hole cleaning and glue injection; s4, the front ends of the steel bars are sleeved with fixing pieces, and steel bar planting is completed; s5, nondestructive anti-drawing force detection is carried out; a detachable angle control piece is used for standardizing the drilling angle, and a downward inclined hole forming mode is selected, so that the interior of a hole is cleaned conveniently; the angle control assembly capable of sliding on the machine body fixing piece can effectively control the drilling depth to avoid the situation that the drilling depth is too deep or too short; the embedded steel bar anchoring effect and the qualified rate can be greatly improved by matching with a fixing piece; and the torque sensor can cut off a power supply to prevent internal steel bars from being damaged when sensing reverse torque change.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a method for constructing inclined secondary structures with rebar anchoring. Background Technology

[0002] Rebar anchoring, also known as post-anchoring rebar installation, involves drilling holes in existing concrete structures, injecting high-strength specialized anchoring adhesive, and then inserting rebars (or bolts). The adhesive's bonding and anchoring force allows the newly inserted rebar to form a strong bond with the existing concrete, thus connecting, reinforcing, strengthening, or adding new components. In secondary structure construction (masonry work), it is a key technology for achieving reliable connections between the secondary and main structures. However, current technology lacks detailed standard specifications to govern the drilling, hole cleaning, rebar insertion, and adhesive injection processes, hindering construction quality. After completion, a certain proportion of rebars from the anchoring points are randomly selected for pull-out destructive testing to assess the anchoring effect. However, pull-out tests often result in anchoring failure, leading to extensive rework and compromising overall anchoring quality. Therefore, in-depth optimization of rebar anchoring technology and the development of systematic innovative anchoring techniques are of significant practical importance for improving project quality.

[0003] Therefore, there is an urgent need to develop a construction method or facility that can standardize and unify the rebar installation standards so that they are based on evidence, reduce the need for extensive rework after pull-out destructive tests, and improve the rebar anchoring effect and work efficiency. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a method for constructing inclined secondary structures with rebar anchoring. This method standardizes construction procedures, addresses the issue of extensive rework following pull-out destructive tests, and improves the anchoring effect, efficiency, and pass rate of rebar anchoring inspections.

[0005] The present invention provides a method for constructing inclined secondary structure rebar installation, comprising the following steps:

[0006] S1. Use software to design and optimize the location and depth of rebar installation;

[0007] S2. Use a drilling rig to create inclined holes at the rebar anchoring points;

[0008] S3. Clean the hole and apply adhesive;

[0009] S4. Connect the front end of the rebar to the fixing piece to complete the rebar installation;

[0010] S5. Non-destructive tensile strength test.

[0011] Furthermore, in step S2, a drilling auxiliary device is provided on the outside of the drilling rig. The drilling auxiliary device includes a body fixing component and an angle control component. The body fixing component is snapped onto the body of the drilling rig, and the angle control component is slidably sleeved on the outside of the body fixing component.

[0012] Furthermore, the angle control component includes an angle control element and a connector. The end of the angle control element is an angled bevel that connects to the end of the connector. When in use, it fits against the working surface to change the drilling angle. The inner side of the connector is provided with a wedge that engages with the machine body fixing element.

[0013] Furthermore, the fuselage fixing component includes symmetrically arranged side slides and a slide groove on the top of the fuselage. The slides engage with the wedges, allowing the connector to slide along the length of the fuselage under constraint. A bolt is provided in the slide groove, and the bolt can slide in a lockable manner within the slide groove. The connector can have its sliding length limited along the length of the fuselage by the bolt.

[0014] Furthermore, the body fixing component also includes L-shaped clips, and several L-shaped clips are provided along the length of the body. The body fixing component can be constrained and fixed to the surface of the drilling rig by the L-shaped clips.

[0015] Furthermore, one end of the angle control component is flush with the end of the drill bit of the drilling rig, and the other end is bent inward along the contour to form a plane. The plane is provided with a plurality of bolt holes, and one end of the connector is bent along the contour direction to form a mating surface. The plane and the mating surface are fastened together by bolts.

[0016] Furthermore, the surface of the slide groove is provided with graduations, and a nut is provided inside. The nut can be restricted from rotating by the slide groove and cooperates with the bolt to form a self-locking mechanism.

[0017] Furthermore, the L-shaped fastener includes a side plate with adjustable length. The side plate consists of two hollow plates that are fitted together. The hollow plates are provided with several bolt holes, which can be fixed by limiting members, so that the length of the side plate is adjustable.

[0018] Furthermore, in step S4, the fastener has multiple layers of barbs circumferentially, and the barbs are alternately arranged radially.

[0019] Furthermore, a torque sensor is installed below the drilling rig, which can detect the torque of the drilling rig drive motor.

[0020] The beneficial effects of this invention are as follows: This invention provides an inclined secondary structure rebar installation method; the use of a detachable angle control component to standardize the drilling angle and select a downward inclined drilling method facilitates cleaning inside the hole; the angle control component, which can slide on the machine body fixing component, can effectively control the drilling depth to avoid excessive depth or shortness; the combination with the fixing component can greatly improve the rebar anchoring effect and qualification rate; and the torque sensor can cut off the power supply when sensing changes in reverse torque to prevent damage to the internal rebar. Attached Figure Description

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

[0022] Figure 1 This is a schematic diagram of the installation structure of the drilling auxiliary device of the present invention;

[0023] Figure 2 Left view of the drilling auxiliary device of the present invention being installed;

[0024] Figure 3 This is a left view of the fuselage fixing component of the present invention;

[0025] Figure 4 This is a right view of the fuselage connector of the present invention;

[0026] Figure 5 This is a schematic diagram of rebar installation after drilling in this invention;

[0027] Figure 6 This is a schematic diagram of the installation of the fastener of the present invention. Detailed Implementation

[0028] like Figures 1 to 6 As shown: This embodiment of a method for constructing rebar anchoring in an inclined secondary structure includes the following steps:

[0029] S1. Utilize software to design and optimize the location and depth of rebar installation; fully analyze the stress characteristics based on the intended use of the rebar installation, and adjust the drilling depth according to the concrete strength grade (e.g., increase the drilling depth by 2d for C25 concrete compared to C30). For cantilevered components or areas with weak stress, a key mechanical analysis should be conducted. Select a rebar installation depth that meets the maximum value of 0.3Ls, 10d, and 100mm, and multiply it by a correction factor of 1.15. Simulate the conflict between the rebar installation location and the main structural reinforcement using a Revit model, automatically optimize the drilling coordinates, and clarify the rebar installation diagram to minimize the risk of "drilling through the main reinforcement" and repeated drilling.

[0030] S2. Drilling hole 5 at the rebar insertion point using drilling rig 3; the drill bit 301 of the drilling rig is a threaded drill bit, which is pushed forward to form a hole and then reversed to clean the hole and withdraw. The formed threaded hole is better for resisting pull-out after gluing and inserting rebar. Generally, the optimal difference between the hole diameter and the rebar diameter (Dd) is 4mm, which can not only meet the needs of convenient rebar insertion construction, but also ensure full gluing. In order to avoid drilling the main structural rebar by drilling rig 3, the drilling rig 3 is equipped with torque sensor 4. The torque sensor 4 can detect the torque of the drive motor. When the drill bit 301 drills into the structural rebar, the torque sensor 4 detects that the torque reaches the threshold and sends a signal to the PLC controller to automatically shut down the drilling rig 3. This can effectively avoid damage to the wall column rebar and affect the structural safety. The hole forming of the rebar insertion hole 5 is different from the existing technology level. It adopts a more superior downward slightly inclined hole forming method, which is beneficial for subsequent hole cleaning and improves the bonding of the rebar adhesive to the hole.

[0031] S3. Hole Cleaning and Adhesive Injection: Since clean holes can increase bonding strength by more than 30%, the on-site process of "multiple blowing, repeated brushing, endoscopic inspection, and temporary sealing with tape" is adopted. This involves using high-pressure air (0.6MPa) to blow into the hole, combined with at least three reciprocating strokes with a wire brush. After completion, an endoscope is used to check if the hole cleaning is thorough. Finally, tape is applied to the hole opening to temporarily seal it and prevent dust from entering before adhesive injection. A material matching control mechanism is used during adhesive injection, establishing a database of compatibility between "reinforcing steel - adhesive - concrete - ambient temperature." For example, HRB400E reinforcing steel is preferentially paired with solvent-free adhesives, and high-elasticity modulus adhesives (elasticity modulus ≥ 2000MPa) are selected for C40 and above concrete. In high-temperature environments, where the substrate surface temperature exceeds 35℃, the high temperature accelerates the curing of the adhesive, significantly shortening the rebar adhesive's working time. Improper operation may lead to increased adhesive shrinkage stress or the formation of air bubbles, ultimately affecting the bonding strength. In such cases, high-temperature type or Class II adhesive should be selected. The material should be stored in a cool place and used only before construction. Before construction, spray water mist onto the substrate surface to cool it down. Construction should be avoided during high-temperature periods and should be carried out in the early morning or late evening. In low-temperature environments (referring to substrate surface temperatures below -5℃), the adhesive has poor fluidity, long initial setting and curing times, making it difficult to fill the gaps between the hole walls and the reinforcing bars. The adhesive is also prone to freezing damage before curing, severely affecting its strength. In this case, a low-temperature curing type rebar adhesive should be selected. Before construction, a hot air blower can be used to preheat the substrate and remove moisture. After rebar installation, it is advisable to cover it with insulation material to delay heat loss. In this embodiment, the preferred high-performance adhesive, "modified epoxy resin adhesive," has added nano-calcium carbonate filler to increase the compressive strength to over 45MPa.

[0032] S4. The front end of the rebar is fitted with the fixing piece 6 to complete the rebar installation; after the fixing piece 6 is securely fitted with the rebar 7, it is then inserted into the rebar hole 5. Even without injecting rebar adhesive, the rebar 7 and the rebar hole 5 can generate an interaction force, making it difficult for the rebar 7 to be pulled out. The new end structure of the rebar 7 has a significant effect on the tensile strength of the rebar installation.

[0033] S5. Pull-out force test; To avoid destructive pull-out force testing, non-destructive testing technology, namely ultrasonic rebound combined method, is applied. The anchoring quality is judged by the sound wave propagation speed (≥3.5km / s) and rebound value (≥35MPa). The sampling rate can be increased to 10% and the testing process is non-destructive. In the early stage, the application of non-destructive testing technology can be combined with pull-out test for comparison. The non-destructive testing qualification standard can be clarified through statistical comparative analysis.

[0034] In this embodiment, in step S2, a drilling auxiliary device is provided on the outside of the drilling rig. The drilling auxiliary device includes a body fixing component 2 and an angle control component 1. The body fixing component 2 is snapped onto the body of the drilling rig 3, and the angle control component 1 is slidably sleeved on the outside of the body fixing component 2. When the drilling rig 3 is drilling, the angle control component 1 of the drilling auxiliary device is pressed against the structural surface. At the same time, the bolt 201 on the slide groove 204 of the body fixing component 2 is adjusted to the predetermined depth scale line position to form a limit and control the drilling depth. The drilling depth is improved and stabilized by changing the method from manual perception to visual data. While the angle control component 1 is pressed against the structural surface, it makes the entire drilling rig 3 form a certain angle with the structural surface. Through tool-like assistance, the hole forming angle is guaranteed to be neither too low nor too low. This will not be elaborated further here.

[0035] In this embodiment, the angle control component 1 includes an angle control connector 101 and a connector 102. The end of the angle control connector 101 is an angled bevel, and the other end connects to the end of the connector 102. During use, it conforms to the structural surface to change the drilling angle. The inner side of the connector 102 is provided with a wedge 1021 that engages with the machine body fixing component 2. The connector 102 is a metal structural piece with a certain degree of elasticity, facilitating adaptation to different drilling rig models and improving equipment applicability. The wedge 1021 is a "T"-shaped component symmetrically welded to the inner side of the connector 102. This symmetrical arrangement ensures smooth sliding and avoids self-locking between structures during unilateral sliding connections. Once the "T"-shaped structure is embedded in the groove, it can be firmly locked in the direction perpendicular to the mounting surface, preventing direct removal. All tensile forces are converted into shear and compressive stresses on the inner wall of the groove, resulting in high load-bearing capacity.

[0036] In this embodiment, the body fixing component 2 includes symmetrically arranged side slides 202 and a slide groove 204 disposed on the top of the body. The slide groove 202 engages with the wedge 1021, allowing the connecting component 102 to slide along the length of the body under constraint. A bolt 201 is provided in the slide groove 204, and the bolt 201 can slide lockably within the slide groove 204. The connecting component 102 can be limited in its sliding length along the length of the body by the bolt 201. By locking the bolt 201 at different positions within the slide groove, the angle control component 1 can control different sliding lengths. This method visualizes and controls the feed depth of the drill bit 301. The main structure of the body fixing component 2 is also designed as a metal sheet structure with a certain degree of elasticity, thereby achieving a snap-fit ​​and covering of different models of drilling rig bodies, improving the applicability of the device. The slide groove 202 can be formed using a bending process, improving the overall integrity of the body fixing component 2.

[0037] In this embodiment, the body fixing component 2 further includes L-shaped clips 203. Several L-shaped clips 203 are provided along the length direction of the body. The body fixing component 2 can be constrained and fixed to the surface of the drilling rig by the L-shaped clips 203. At least two L-shaped clips 203 are provided, and their positions are close to both sides of the handle, forming a length direction constraint on the body fixing component 2 to prevent the body fixing component 2 from sliding during operation and thus affecting the drilling accuracy. The L-shaped clips 203 form a vertical limit on the body fixing component 2 and cooperate with the setting of the elastic metal structural plate, so that the body fixing component 2 can be firmly fixed to the surface of the drilling rig 3.

[0038] In this embodiment, one end of the angle control connector 101 is flush with the end of the drill bit 301, and the other end is bent inward along the contour to form a plane. The plane has several bolt holes. One end of the connector 102 is bent along the contour to form a mating surface. The plane and the mating surface are fastened together by bolts. By using the detachable angle control connector 101, a more suitable angle can be quickly changed for drilling, or drilling can be performed directly without the angle control connector if the working space does not meet the requirements. This effectively standardizes the inclined drilling angle, ensures uniformity, and reduces the defect rate.

[0039] In this embodiment, the surface of the slide groove 204 is provided with a scale, and a nut 2011 is provided inside. The nut 2011 can be restricted from rotation by the slide groove 204 and cooperates with the bolt 201 to form a self-locking mechanism. Since the internal width of the slide groove 204 is similar to the width of the nut 2011, the nut 2011 can be constrained by the rotation of the slide groove 204, which facilitates the smooth screwing of the top bolt 201. This method reduces the use of auxiliary tools and improves the ease of use of the device. The scale facilitates quick positioning according to the drilling depth set by the software before drilling, and improves work efficiency through visualization.

[0040] In this embodiment, the L-shaped clamp 203 includes an adjustable-length side plate, which is a combination of two hollow plates of different sizes. The hollow plates have several bolt holes through which the limiting member 2031 passes and fixes the plate, making the length of the side plate adjustable. The adjustable-length side plate can be used to adapt to different types of drilling rigs, preventing installation failure on other types of drilling rigs. The limiting member 2031 is a cylindrical body with a length longer than the hollow plate, making it easy to remove and reconnect when the length of the L-shaped clamp 203 is changed.

[0041] In this embodiment, the fixing member 6 in step S4 has multiple layers of barbs circumferentially arranged, and the barbs are alternately arranged radially. The fixing member 6 is welded to the end of the rebar 7. The barbs have a certain elasticity, and their outer diameter is slightly larger than that of the anchoring hole 5. When the barbs of the fixing member enter the anchoring hole, they are in a compressed state. Because the barbs are elastic, they can apply pressure to the anchoring hole 5, so that the barbs can fully contact the wall of the anchoring hole. The multiple layers of alternating barbs can form multiple support points on the wall of the anchoring hole, preventing the rebar 7 from moving outward. This improves the stability and pass rate of the anchoring.

[0042] In this embodiment, a torque sensor 4 is provided below the drilling rig 3. The torque sensor 4 can detect the torque of the drilling rig drive motor. When the drilling rig 3 drills, the hardness of concrete and steel bars are different, and the torque generated when the drill bit 301 contacts is different. Therefore, a corresponding torque threshold is set. However, when the torque reaches the torque required to drill steel bars, a signal is sent to stop the machine. This helps to avoid steel bars that were not detected during BIM collaborative settings or steel bars that have shifted due to pouring or on-site binding. This prevents damage to the structural reinforcement and ensures the safety of the building structure.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for constructing inclined secondary structure rebar installation, characterized in that: Includes the following steps: S1. Use software to design and optimize the location and depth of rebar installation; S2. Use a drilling rig to create inclined holes at the rebar anchoring points; S3. Clean the hole and apply adhesive; S4. Connect the front end of the rebar to the fixing piece to complete the rebar installation; S5. Non-destructive tensile strength test.

2. The method for constructing inclined secondary structure rebar installation according to claim 1, characterized in that: In step S2, a drilling auxiliary device is provided on the outside of the drilling rig. The drilling auxiliary device includes a body fixing component and an angle control component. The body fixing component is snapped onto the body of the drilling rig, and the angle control component is slidably sleeved on the outside of the body fixing component.

3. The method for constructing inclined secondary structure rebar installation according to claim 2, characterized in that: The angle control component includes an angle control element and a connector. The end of the angle control element is an angled bevel that connects to the end of the connector. When in use, it fits against the structural surface to stabilize the drilling angle. The inner side of the connector is provided with a wedge that engages with the machine body fixing element.

4. The method for constructing inclined secondary structure rebar installation according to claim 3, characterized in that: The fuselage fixing component includes symmetrically arranged side slides and a slide groove on the top of the fuselage. The slides engage with the wedges, allowing the connecting component to be constrained to slide along the length of the fuselage. The slide groove is equipped with bolts, which can slide in a lockable manner within the slide groove. The connecting member can be limited in sliding length along the length of the machine body by the bolts.

5. The method for constructing inclined secondary structure rebar installation according to claim 2, characterized in that: The body fixing component also includes L-shaped clips, and several L-shaped clips are provided along the length of the body. The body fixing component can be constrained and fixed to the surface of the drilling rig by the L-shaped clips.

6. The method for constructing inclined secondary structure rebar installation according to claim 3, characterized in that: One end of the angle control component is flush with the end of the drill bit of the drilling rig, and the other end is bent inward along the contour to form a plane. Several bolt holes are provided in the plane. One end of the connector is bent along the contour direction to form a mating surface. The plane and the mating surface are fastened together by bolts.

7. The method for constructing inclined secondary structure rebar installation according to claim 4, characterized in that: The surface of the slide is marked with graduations and a nut is provided inside. The nut can be restricted from rotating by the slide and cooperates with the bolt to form a self-locking mechanism.

8. The method for constructing inclined secondary structure rebar installation according to claim 5, characterized in that: The L-shaped fastener includes a side plate with adjustable length. The side plate consists of two hollow plates that are fitted together. The hollow plates have several bolt holes through which a limiting member can pass and fix the plate, thus making the length of the side plate adjustable.

9. The method for constructing inclined secondary structure rebar anchoring according to claim 1, characterized in that: The fastener in step S4 has multiple layers of barbs circumferentially, and the barbs are alternately arranged radially.

10. The method for constructing inclined secondary structure rebar anchoring according to claim 1, characterized in that: A torque sensor is installed below the drilling rig, which can detect the torque of the drilling rig drive motor.

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