Special metal anchor bolt with drilling depth positioning structure for reinforced concrete prefabricated frame and mounting method of special metal anchor bolt

Abstract

The invention relates to the technical field of building operation, in particular to a metal anchor bolt special for a reinforced concrete prefabricated frame with a drilling depth positioning structure and an installation method thereof.One end of the anchor bolt is arranged on the inner side of a prefabricated frame body to be prefabricated and formed, the needed embedding depth is obtained, and the needed exposed length is reserved; a plurality of anchor bolt positioners are adopted to place the anchor bolts around the periphery of the prefabricated frame body, and each anchor bolt positioner is composed of a positioning template, and a distance adjusting plate and a distance increasing plate which are elastically connected to the two sides of the positioning template; the anchor bolt positioner is used for adjusting the overall width by adjusting the distance adjusting plate and additionally arranging the distance increasing plate so that the anchor bolt positioner can be adaptively erected on a prefabricated formwork on the outer side of the prefabricated frame body. According to the method, the special metal anchor bolt provided with the scale area through laser etching is cooperatively matched with the anchor bolt positioner, millimeter-level accurate pre-control over the embedding depth and the exposed length of the anchor bolt is completed, and it is ensured that each anchor bolt has the effective anchoring depth and the exposed length required by design after pouring and curing.

Description

Technical Field

[0001] This invention relates to the field of construction operation technology, specifically to a special metal anchor bolt for precast reinforced concrete frames with a drilling depth positioning structure and its installation method. Background Technology

[0002] In the field of prefabricated buildings, efficient and reliable on-site connection of reinforced concrete precast frames is a core element in ensuring overall structural safety and construction quality. Among these, the precise positioning of pre-embedded metal anchors is fundamental to achieving connections between precast components such as beams and columns. Current technologies often employ simple fixing methods or rely on the experience of on-site workers for depth adjustment when pre-embedding anchors, which commonly suffers from the following problems: Firstly, the imprecise control of the embedment depth and exposed length of the anchor bolts leads to inconsistent pre-drilling depths in the connected precast components, resulting in uneven stress on the anchor bolts at the same node and difficulty in ensuring the effective anchoring depth. This seriously affects the design mechanical properties of the node, such as pull-out force, shear force, and seismic reliability. Secondly, it is difficult to adapt to the needs of precast components of different sizes and diverse anchor bolt arrangement schemes, resulting in poor versatility. Furthermore, it is prone to grout leakage or displacement during the pouring process, affecting the molding quality. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, the present invention aims to provide a special metal anchor bolt for reinforced concrete precast frames with a drilling depth positioning structure and its installation method. It integrates three major functional advantages: precise measurement, flexible adaptation, and flexible layout, forming a complete anchor bolt pre-embedding solution. It not only ensures the core accuracy requirements of anchor bolt pre-embedding through hardware design, but also significantly improves the convenience and adaptability of construction through modular and adjustable tooling design. This has significant practical application value for promoting the standardization, high quality, and high efficiency of reinforced concrete precast frame structure construction.

[0004] To achieve the above objectives, this invention provides an installation method for a special metal anchor bolt for a precast reinforced concrete frame with a drilling depth positioning structure. The method involves prefabricating the anchor bolt by placing one end inside the precast frame body to achieve the required embedment depth and reserving the required exposed length. Several anchor bolt locators are used to position the anchor bolt around the periphery of the precast frame body. Each anchor bolt locator consists of a positioning template, elastically connected adjusting plates on both sides, and an extending plate placed between the positioning template and the adjusting plates. The anchor bolt locator adjusts its overall width by adjusting the adjusting plates and adding extending plates to fit the precast template on the outside of the precast frame body, forming the anchor bolt precast plate. Adjacent anchor bolt locators are connected by locking rods. Several anchor bolt locators surround the precast template to form a precast cavity for placing the reinforcing cage and pouring concrete. The anchor bolt is inserted into the reserved hole in the positioning template, and the exposed length of the anchor bolt is measured and adjusted to the reserved length.

[0005] As a further improvement to this technical solution, a prefabricated slab with adjustable width is formed by using a positioning template, several adjusting plates and several extending plates. The positioning template has horizontal positioning holes at the top and bottom of both narrow sides. The adjusting plates have guide posts embedded at the top and bottom of one narrow side. The guide posts are limited and sleeved with the positioning holes, and springs are sleeved on the outside of the guide posts.

[0006] As a further improvement to this technical solution, the distance extending plate is of the same thickness and height as the positioning template and the distance adjusting plate. The narrow side of the distance extending plate is provided with slots at the top and bottom. The slots are L-shaped and their horizontal sections penetrate the wide side of the distance extending plate. The slots are slidably engaged with the guide post.

[0007] As a further improvement to this technical solution, positioning grooves are provided on both narrow sides of the positioning template, and a locking strip is provided on one side of both the adjusting plate and the extending plate. The locking strip engages with the positioning groove, and a groove is provided on the other side of the extending plate to engage with another locking strip.

[0008] As a further improvement to this technical solution, the outer side of the adjusting plate is inclined and fits into the inclined surface of another adjacent adjusting plate. A limiting hole is provided on the inclined surface of the outer side of the adjusting plate. The limiting hole passes through the upper and lower ends of the adjusting plate and has a structure that is wider on the inside and narrower on the outside. The locking rod is inserted into a pair of limiting holes.

[0009] As a further improvement to this technical solution, a fixing plate is provided at the lower end of the positioning template. The fixing plate is snapped onto the outside of the precast template and fixedly connected by bolts.

[0010] As a further improvement to this technical solution, a positioning plate is used to place the anchor bolts. The center of the side of the positioning template is provided with an anchor bolt installation port for installing the positioning plate. The side of the positioning plate is provided with a number of bolt holes in a dot matrix pattern for inserting the anchor bolts. The outer side of the positioning plate is rotatably connected to a positioning frame, and the positioning frame is fixedly connected to the anchor bolt installation port.

[0011] As a further improvement to this technical solution, an annular groove is provided on the outer side of the positioning disk, and a limiting groove is provided on the inner side of the positioning frame. Several limiting pieces are slidably arranged between the annular groove and the limiting groove.

[0012] As a further improvement to this technical solution, a number of sliding grooves are provided at the outer edge of the positioning disk. The sliding grooves pass through the annular groove but do not pass through the inner end face of the positioning disk. The limiting piece is inserted into the sliding groove by a limiting pin.

[0013] On the other hand, the present invention provides a special metal anchor for precast reinforced concrete frames with a drilling depth positioning structure. The installation and positioning are carried out by the above-mentioned installation method of the special metal anchor for precast reinforced concrete frames with a drilling depth positioning structure. The special metal anchor consists of a threaded rod and a threaded cap connected by threads. The outer wall of the threaded rod has a scale area opened along its axial direction, and the positioning length of the threaded rod is displayed by setting the scale line.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The special metal anchor bolt for precast reinforced concrete frames with drilling depth positioning structure and its installation method, through the coordinated use of special metal anchor bolts with laser-etched scale areas and anchor bolt positioners, achieves millimeter-level precise pre-control of anchor bolt embedment depth and exposed length. The scale area provides an intuitive visual calibration benchmark. Combined with the stable precast cavity formed by the positioner, it ensures that each anchor bolt has the effective anchoring depth and exposed length required by the design after pouring and curing, thus achieving the key technical effect of fundamentally ensuring uniform and reliable mechanical performance of node connections.

[0015] 2. The special metal anchor bolt for precast reinforced concrete frames with drilling depth positioning structure and its installation method, through the width-adjustable anchor bolt locator system composed of positioning template, elastic adjusting plate and extending plate, completes the rapid adaptation and sealed assembly of precast frame templates of various sizes. The spring-driven adjusting plate can automatically clamp the extending plate to ensure tight alignment between the plates; the locking rod further strengthens the connection between adjacent locators, together forming a precast cavity with good rigidity and good sealing performance, achieving the technical effect of improving the versatility of tooling and simplifying construction.

[0016] 3. The special metal anchor bolt for precast reinforced concrete frames with drilling depth positioning structure and its installation method, by setting a positioning plate structure with dot matrix bolt holes and rotatable adjustment, realizes the rapid conversion of different numbers and layouts of anchor bolts at the same template position, thereby achieving the technical effect of enhancing the design flexibility of precast frame connection nodes. Attached Figure Description

[0017] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, will select various possible shapes and proportions to implement the invention according to specific circumstances.

[0018] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention; Figure 2 For the present invention Figure 1 Top view; Figure 3 This is a schematic diagram of the assembly structure of several anchor bolt positioners of the present invention; Figure 4 This is an exploded view of the anchor bolt locator of the present invention; Figure 5 This is an exploded view of the adjusting plate and the extending plate of the present invention; Figure 6 This is a schematic diagram of the locking rod structure of the present invention; Figure 7 This is an exploded view of the positioning frame and positioning disk of the present invention; Figure 8 This is an exploded view of the positioning disc and the special metal anchor bolt of the present invention; Figure 9 This is a split view of the special metal anchor bolt of the present invention; The meanings of the labels in the diagram are as follows: 100. Prefabricated frame body; 200. Anchor bolt locator; 210. Positioning template; 211. Positioning hole; 212. Fixing plate; 213. Positioning groove; 214. Anchor bolt installation port; 220. Adjusting plate; 221. Guide post; 222. Positioning sleeve; 223. Locking strip; 224. Limiting hole; 230. Extending plate; 231. Locking groove; 240. Locking rod; 300, Threaded rod; 301, Scale area; 302, Threaded cap; 310, Positioning plate; 311, Bolt hole; 312, Sealing part; 313, Annular groove; 314, Sliding groove; 320, Positioning frame; 321, Limiting groove; 330, Limiting piece; 340, Limiting pin. Detailed Implementation

[0019] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art will conceive of any possible variations of the invention, all of which should be considered within the scope of the invention. The terms "installation" and "connection" should be interpreted broadly, referring to direct connection as well as indirect connection through an intermediate medium.

[0020] The terms "central axis," "vertical," "horizontal," "front," "rear," "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer" used herein to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, in the description of the invention, "a number" means two or more, unless otherwise explicitly specified.

[0021] Please see Figure 9 As shown, the present invention provides a special metal anchor bolt for precast reinforced concrete frames with a drilling depth positioning structure. The special metal anchor bolt is composed of a threaded rod 300 and a threaded cap 302 connected by threads. The outer wall of the threaded rod 300 has a scale area 301 along its axial direction, and the positioning length of the threaded rod 300 is indicated by the scale lines. The internal thread of the threaded cap 302 is more than two turns to increase the sealing performance with the threaded rod 300. The scale area 301 is laser-etched to form a scale, which facilitates visual inspection and calibration during installation.

[0022] Please see Figures 1-2 As shown, the installation method of the special metal anchor bolt for reinforced concrete precast frames with drilling depth positioning structure includes: placing one end of the aforementioned special metal anchor bolt for reinforced concrete precast frames with drilling depth positioning structure inside the precast frame body 100 to precast it, obtaining the required embedment depth, ensuring effective anchoring depth, and optimizing the pull-out force and shear resistance of the anchor bolt; and reserving the required exposed length, which determines the number of turns the nut can be screwed in when the beam and column are tightened through the connecting plate and nut. A consistent exposed length, combined with a torque wrench, ensures uniform clamping force at all connection points that meets design requirements.

[0023] Please see Figures 3-6 As shown, several anchor bolt positioners 200 are used to place the anchor bolts around the periphery of the precast frame body 100 so that concrete precast anchor bolts can be poured onto the precast frame within the enclosed space. The anchor bolt positioner 200 consists of a positioning template 210 and adjustable plates 220 elastically connected on both sides, as well as an extending plate 230 placed at the gap between the positioning template 210 and the adjustable plate 220. All components of the anchor bolt positioner 200 are made of POM plastic, which is hard, corrosion-resistant, and durable. The anchor bolt positioner 200 adjusts its overall width by adjusting the adjustable plate 220 and adding the extending plate 230 to fit on the precast template outside the precast frame body 100, forming the anchor bolt precast plate.

[0024] Two adjacent anchor bolt positioners 200 are connected by a locking rod 240. Several anchor bolt positioners 200 surround the precast template to form a precast cavity for placing the steel cage and pouring concrete. The anchor bolt is inserted into the reserved hole of the positioning template 210 and the exposed length of the anchor bolt is measured and adjusted to the reserved length.

[0025] Specifically, a precast slab with adjustable width is formed by using a positioning template 210, several adjusting plates 220, and several extending plates 230. The positioning template 210 has horizontally positioned holes 211 on both sides of its narrow edges. The adjusting plates 220 have guide posts 221 embedded on both sides of their narrow edges. The guide posts 221 are fitted into the positioning holes 211 and are fitted with springs. The outer end of the guide posts 221 is fixed with a round block that fits into the positioning holes 211. The positioning holes 211 are fitted with positioning sleeves 222. The guide posts and positioning sleeves 222 are slidably fitted together, so that the springs are restricted within the positioning holes 211, which causes the adjusting plates 220 to spring back and reset, clamping the extending plates 230 and forming a whole-slab barrier against cement with the positioning template 210.

[0026] Furthermore, the distance extender plate 230 is of the same thickness and height as the positioning template 210 and the distance adjuster plate 220. The narrow side of the distance extender plate 230 is provided with slots 231 at the top and bottom. The slots 231 are L-shaped and their horizontal sections penetrate the wide side of the distance extender plate 230. The slots 231 are slidably engaged with the guide post 221, so that the distance extender plate 230 is positioned and installed and clamped between the positioning template 210 and the distance adjuster plate 220.

[0027] Positioning slots 213 are provided on both narrow sides of the positioning template 210. The adjusting plate 220 and the extending plate 230 are provided on one side with a retaining strip 223. The retaining strip 223 engages with the positioning slot 213 to further ensure that the three are aligned and side by side, forming a blocking surface together with the precast template. The extending plate 230 is provided with a groove on the other side to engage with another retaining strip 223, so that when several extending plates 230 are added, they are positioned and installed together.

[0028] Furthermore, the outer side of the adjusting plate 220 is beveled and fits snugly against the bevel of the adjacent adjusting plate 220. A limiting hole 224 is provided on the beveled outer side of the adjusting plate 220. The limiting hole 224 passes through the upper and lower ends of the adjusting plate 220, and the width of the limiting hole 224 is wider on the inside and narrower on the outside, forming a limiting structure. The locking rod 240 is inserted into a pair of limiting holes 224, so that the connection between the two adjacent anchor bolt positioners 200 is stable and without gaps, thus preventing cement from overflowing.

[0029] The lower end of the positioning template 210 is provided with a fixing plate 212. The fixing plate 212 is snapped onto the outside of the precast template and fixed by bolts. Several holes are opened on the side of the fixing plate 212 so that screws can pass through. The lower ends of the adjusting plate 220 and the extending plate 230 are also provided with fixing plates 212 to hold the precast template. Several vertical reinforcing ribs are provided at equal intervals on the outer side of the fixing plate 212 to increase the resistance to cement.

[0030] Please see Figures 7-8 As shown, in order to flexibly adjust the placement and number of anchor bolts, a positioning plate 310 is used to place the anchor bolts. The center of the side of the positioning template 210 is provided with an anchor bolt installation port 214 for installing the positioning plate 310. The side of the positioning plate 310 is provided with a number of anchor bolt holes 311 in a dot matrix pattern for inserting anchor bolts. The anchor bolt holes 311 that do not require anchor bolt insertion are sealed by inserting a sealing member 312 to prevent cement from overflowing. The inner and outer ends of the anchor bolt holes 311 are holes of different sizes. It is preferred that the anchor bolt holes are composed of cylindrical holes and polygonal holes so that the sealing member 312 does not slip when blocking cement.

[0031] In addition, the threaded cap 302 is fitted with the polygonal hole adapter, allowing the threaded rod 300 to rotate and adjust the reserved length; the outer side of the positioning plate 310 is rotatably connected to the positioning frame 320, which is fixedly connected to the anchor bolt installation port 214 to stabilize the positioning plate 310 and adjust the anchor bolt placement position.

[0032] Specifically, the outer side of the positioning disk 310 is provided with an annular groove 313, and the inner side of the positioning frame 320 is provided with a limiting groove 321. Several limiting pieces 330 are slidably arranged between the annular groove 313 and the limiting groove 321 to ensure that the positioning disk 310 and the positioning frame 320 are connected as a whole, and the positioning disk 310 can be rotated and adjusted. By using sizes that are compatible, the friction between the two is increased, so that the positioning disk 310 can be suspended at any position.

[0033] Several grooves 314 are formed on the outer edge of the positioning plate 310. The grooves 314 penetrate the annular groove 313 but do not penetrate the inner end face of the positioning plate 310 to prevent overflow when cement is blocked by the inner end face of the positioning plate 310. The limiting piece 330 is inserted into the groove 314 through the limiting pin 340. The groove 314 is composed of a circular hole and a square hole connected together, with the square hole near the edge of the positioning plate 310. The limiting pin 340 is a square-headed column. The positioning plate 310 is engaged with the positioning plate 310. Before the positioning frame 320, the positioning plate 310 is moved to the round hole of the slide groove 314 by the limiting pin 340, which drives the limiting piece 330 to move completely into the annular groove 313. When the positioning plate 310 is aligned with the end face of the positioning frame 320, the positioning plate 310 is moved to the square hole of the slide groove 314 by the limiting pin 340, which drives the limiting piece 330 to move partially into the limiting groove 321. Then the limiting pin 340 is pressed down so that its square head is inserted into the square hole to form a limiting state, ensuring that the positioning plate 310 rotates and fits in the positioning frame 320 without slipping.

[0034] It should be noted that the fixed connection and fixing method of the present invention are achieved by conventional fixing means such as bolt connection, welding, or bonding that are compatible with each other. These are existing technologies and will not be described in detail here. The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An installation method for a special metal anchor bolt for a precast reinforced concrete frame with a drilling depth positioning structure, wherein the anchor bolt is precast by placing one end inside the precast frame body to obtain the required embedment depth, and leaving the required exposed length; characterized in that: Several anchor bolt locators are used to place the anchor bolt around the periphery of the precast frame body. The anchor bolt locator consists of a positioning template and adjustable plates elastically connected to both sides, as well as an extending plate placed in the gap between the positioning template and the adjustable plates. The anchor bolt locator adjusts its overall width by adjusting the adjustable plates and adding extending plates to fit the precast template on the outside of the precast frame body, forming the anchor bolt precast plate. Adjacent anchor bolt locators are connected by locking rods. Several anchor bolt locators surround the precast template to form a precast cavity for placing the reinforcing cage and pouring concrete. The anchor bolt is inserted into the reserved hole of the positioning template, and the exposed length of the anchor bolt is measured and adjusted to the reserved length.

2. The installation method of the special metal anchor bolt for reinforced concrete precast frame with drilling depth positioning structure according to claim 1, characterized in that: A prefabricated slab with adjustable width is formed by using a positioning template, several adjusting plates, and several extending plates. The positioning template has horizontal positioning holes at the top and bottom of both narrow sides. The adjusting plates have guide posts embedded at the top and bottom of one narrow side. The guide posts are limited and sleeved with the positioning holes, and springs are sleeved on the outside of the guide posts.

3. The installation method of the special metal anchor bolt for reinforced concrete precast frame with drilling depth positioning structure according to claim 2, characterized in that: The distance-extending plate is of the same thickness and height as the positioning template and the distance-adjusting plate. The narrow side of the distance-extending plate is provided with slots at the top and bottom. The slots are L-shaped and their horizontal sections penetrate the wide side of the distance-extending plate. The slots are slidably engaged with the guide posts.

4. The installation method of the special metal anchor bolt for reinforced concrete precast frame with drilling depth positioning structure according to claim 3, characterized in that: The positioning template has positioning grooves on both narrow sides. The adjusting plate and the extending plate each have a locking strip on one side, which engages with the positioning groove. The extending plate has a groove on the other side that engages with another locking strip.

5. The installation method of the special metal anchor bolt for reinforced concrete precast frame with drilling depth positioning structure according to claim 4, characterized in that: The outer edge of the adjusting plate is beveled and fits into the bevel of another adjacent adjusting plate. A limiting hole is provided on the outer edge bevel of the adjusting plate. The limiting hole passes through the upper and lower ends of the adjusting plate and has a structure that is wider on the inside and narrower on the outside. The locking rod is inserted into a pair of limiting holes.

6. The installation method of the special metal anchor bolt for reinforced concrete precast frame with drilling depth positioning structure according to claim 5, characterized in that: The lower end of the positioning template is provided with a fixing plate, which is snapped onto the outside of the precast template and fixedly connected by bolts.

7. The installation method of the special metal anchor bolt for reinforced concrete precast frame with drilling depth positioning structure according to claim 1, characterized in that: An anchor bolt is placed using a positioning plate. The center of the side of the positioning template has an anchor bolt installation port for installing the positioning plate. The side of the positioning plate has a number of bolt holes in a dot matrix pattern for inserting the anchor bolt. The outer side of the positioning plate is rotatably connected to a positioning frame, which is fixedly connected to the anchor bolt installation port.

8. The installation method of the special metal anchor bolt for reinforced concrete precast frame with drilling depth positioning structure according to claim 7, characterized in that: The outer side of the positioning disk has an annular groove, and the inner side of the positioning frame has a limiting groove. Several limiting pieces are slidably arranged between the annular groove and the limiting groove.

9. The installation method of the special metal anchor bolt for reinforced concrete precast frame with drilling depth positioning structure according to claim 8, characterized in that: The positioning disk has several sliding grooves at its outer edge. The sliding grooves pass through the annular groove but do not pass through the inner end face of the positioning disk. The limiting piece is inserted into the sliding groove by a limiting pin.

10. A special metal anchor bolt for precast reinforced concrete frames with a drilling depth positioning structure, characterized in that: The installation and positioning are performed using the installation method for the special metal anchor bolt for precast reinforced concrete frames with a drilling depth positioning structure as described in claim 9. This special metal anchor bolt consists of a threaded rod and a threaded cap connected by threads. The outer wall of the threaded rod has a scale area along its axial direction, and the positioning length of the threaded rod is displayed by setting scale lines.

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