screw-on rod

Abstract

The application provides a kind of pair of pull screw, by the inner screw thread sleeve is set in the outer screw of barrel, then set wedge between the tip of inner screw and body, make wedge hinge in the rear end of the tip by compression spring, and can be consistent with the taper of outer screw, when need to put pair of pull screw into wall building template, only need to make tip as front end into inside and outside of wall building template, turn outer screw, make the taper of outer screw lift wedge, then adjust the big nut of rear end of outer screw, make big nut close to the outside of building template back, then fasten pair of pull screw in both sides of building template, when wall building need to remove pair of pull screw, make wedge close, then take out closed pair of pull screw from building template, realize pair of pull screw is removed from building template operation platform without removing pair of pull screw head nut buckle in high altitude, high safety factor and realize repeated use of pair of pull screw.

Description

Technical Field

[0001] This invention relates to the field of building construction, to a construction tool, and more specifically, to a tie rod. Background Technology

[0002] Tie bolts are used to connect the inner and outer formwork of a wall, bearing the lateral pressure of the concrete and other loads, ensuring that the spacing between the inner and outer formwork meets construction requirements. They also serve as fulcrums for the formwork and its supporting structure. Therefore, the arrangement of tie bolts is crucial to the overall stability, rigidity, and strength of the formwork structure. However, traditional tie bolts are mostly disposable bolts. When the wall is poured and the formwork needs to be removed, the nuts at both ends can be loosened to remove the formwork, while the tie bolts remain in the poured wall. The bolt heads exposed outside the wall can then be removed to complete the wall pouring. However, traditional tie bolts cannot be used to connect the inner and outer formwork of a hollow thin-walled pier in a bridge. This is because thin-walled piers are often hundreds of meters high, and it is very difficult and dangerous for workers to enter the narrow cavity of the thin-walled pier to install the nuts on the inside of the tie bolts. A slight mistake could result in a fall from a height.

[0003] Therefore, there is an urgent need for a tie rod that does not require the installation of an inner nut on the tie rod, facilitates the installation of inner and outer steel formwork for hollow thin-walled pier columns at high altitudes, and can be reused. Summary of the Invention

[0004] In view of the above problems, the purpose of this invention is to provide a tie rod to solve the problem that, since thin-walled piers are often hundreds of meters high, it is very difficult and dangerous for workers to enter the cavity of the thin-walled pier to install the nuts on the inside of the tie rod. A slight mistake could lead to a fall from a height, making it impossible for traditional tie bolts to connect the inner and outer formwork of the hollow thin-walled pier wall of the bridge.

[0005] This invention provides a tie rod, characterized in that it comprises an external threaded rod and an internal threaded rod, wherein,

[0006] The external screw has a cylindrical structure, and,

[0007] A tapered inclined surface is provided on the outer side of the front end of the external screw, and a thread is provided on the inner side of the external screw;

[0008] The internal screw includes a body and a pointed part fixed to the front end of the body; and,

[0009] The outer side of the body is also provided with threads, and the body passes through the external thread and is threaded with the external thread;

[0010] A wedge-shaped block is provided between the pointed body and the main body;

[0011] The wedge block is hinged to the rear end of the pointed body by a compression spring. When the wedge block is closed, it is joined to the conical inclined surface, and the diameter of the wedge block closed on the conical inclined surface is not greater than the diameter of the external screw.

[0012] Preferably, the body is longer than the external screw.

[0013] Preferably, the pointed body is bullet-shaped.

[0014] Preferably, the outer side of the external screw is provided with threads;

[0015] A large nut with threads is provided at the rear of the external screw;

[0016] A wrench is provided on the outside of the large nut, and the wrench is used to adjust the relative position of the large nut and the outer threads of the external screw.

[0017] Preferably, a handle is provided at the rear end of the external screw, the handle being used to turn the external screw.

[0018] Preferably, an inner nut is provided at the rear end of the body, and the inner nut is used to adjust the inner screw.

[0019] Preferably, the outer threaded rod and the inner threaded rod penetrate the inner and outer sides of the building formwork;

[0020] Channel steel back ribs are provided on both the inner and outer sides of the building formwork.

[0021] Preferably, if the wedge block opens, the rear end of the pointed body supports the wedge block, so that the wedge block fastens the channel steel back rib on the inner side of the building template;

[0022] The large nut is threaded with the external threaded rod to fasten the channel steel back rib on the outside of the building template.

[0023] Preferably, the internal screw is a solid screw.

[0024] Preferably, the tip has the same diameter as the external screw.

[0025] As described above, the tie rod provided by this invention adjusts the relative relationship between the inner and outer screws by fitting the inner screw thread inside the cylindrical outer screw. A wedge block is placed between the tip and the body of the inner screw, and this wedge block is hinged to the rear end of the tip by a compression spring, and can engage with the tapered slope at the front end of the outer screw. Therefore, when the tie rod needs to be inserted into building formwork such as the inner and outer steel formwork of thin-walled piers, the tip is simply inserted into the inner and outer sides of the formwork. The distance between the inner and outer sides of the formwork is adjusted by regulating the relative relationship between the threads of the inner and outer screws. Once the distance is determined, the outer screw is turned forward or the inner screw is pulled back, causing the tapered slope at the front end of the outer screw to move forward relative to the inner screw, and the inner screw to move backward relative to the outer screw. This allows the tapered slope at the front end of the outer screw to... The wedge-shaped block between the pointed body and the main body is lifted, and the outer screw is kept stationary while the inner screw is moved backward until the rear end of the wedge-shaped block is pressed against the inner side of the formwork. Then, the large nut at the rear end of the outer screw is adjusted so that it is pressed against the outer side of the formwork, thus securing the tie rod to both sides of the formwork. When the wall is completed and the tie rod needs to be removed, the inner screw is moved forward relative to the outer screw, so that the wedge-shaped block is not subjected to the upward force of the outer screw and automatically closes under the action of the spring. The wedge-shaped block closes and aligns on the conical inclined surface, and the diameter of the closed wedge-shaped block on the conical inclined surface is not greater than the diameter of the outer screw. This allows the entire closed tie rod to be pulled out of the formwork, enabling the tie rod to be removed from under the formwork without removing the head nut. This method has a high safety factor, high formwork removal efficiency, and allows for the repeated use of the tie rod. Attached Figure Description

[0026] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings and the contents of the claims, and with a more complete understanding of the invention. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of a pull screw according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic cross-sectional view of the head of the pull screw according to an embodiment of the present invention;

[0029] Figure 3 This is a front view of the head of the pull screw according to an embodiment of the present invention;

[0030] The reference numerals in the accompanying drawings include: 1. outer screw, 2. inner screw, 3. conical inclined surface, 4. body, 5. pointed body, 6. wedge block, 7. spring, 8. large nut, 9. wrench, 10. handle, 11. inner nut, 12. building template, 13. channel steel back rib.

[0031] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0032] Because thin-walled piers are often hundreds of meters high, it is very difficult and dangerous for workers to enter the cavity of the thin-walled pier to install the nuts on the inside of the tie rods. A slight mistake could result in a fall from a height, which makes it impossible for traditional tie bolts to connect the inner and outer formwork of the hollow thin-walled pier wall of the bridge.

[0033] To address the aforementioned problems, the present invention provides a tie rod, and specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] The following description of exemplary embodiments is merely illustrative and is in no way intended to limit the invention or its application or use. Techniques and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques and equipment should be considered part of the specification.

[0035] Figure 1 and Figure 2 These are schematic diagrams of the structure and head cross-section of the pull screw according to an embodiment of the present invention. Figure 1 , Figure 2 As shown in the figure, the present invention provides a tie rod, including an outer screw 1 and an inner screw 2. The specific structure of the outer screw 1 and the inner screw 2 is not specifically limited. In this embodiment, the outer screw 1 is a cylindrical structure, the inner screw 2 is a solid screw, and a tapered inclined surface 3 is provided at the front end of the outer screw 1. A thread is provided on the inner side of the outer screw 1, so that the inner screw 2 passes into the outer screw 1.

[0036] exist Figure 1 , Figure 2 In the commonly illustrated embodiment, the inner screw 2 includes a body 4 and a pointed body 5 fixed to the front end of the body 4; and a thread is also provided on the outer side of the body 4, and the body 4 passes through the outer screw 1 and is threaded with the outer screw 1, that is, the inner screw 2 is screwed into the outer screw 1 by the thread. The specific thread sequence is not specifically limited. In this embodiment, rotating the inner screw 2 counterclockwise will cause the inner screw 2 to move backward relative to the outer screw 1 and the outer screw 1 to move forward relative to the inner screw 2. Rotating the inner screw 2 clockwise will cause the inner screw 2 to move forward relative to the outer screw 1 and the outer screw 1 to move backward relative to the inner screw 2. Rotating the outer screw clockwise is equivalent to rotating the inner screw counterclockwise, which will not be elaborated here.

[0037] Figure 3 This is a front view of the head of the pull screw according to an embodiment of the present invention. Figure 1 , Figure 2 and Figure 3In the commonly illustrated embodiment, a wedge-shaped block 6 is provided between the pointed body 5 and the body 4. This wedge-shaped block 6 is hinged to the rear end of the pointed body 5 via a compression spring and can fit into the conical inclined surface 3. When the wedge-shaped block 6 is closed, it fits onto the conical inclined surface 3, and the diameter of the wedge-shaped block 6 closed on the conical inclined surface 3 is not greater than the diameter of the outer screw 1. That is, the front end of the wedge-shaped block 6 is fixed to the rear end of the pointed body 5 and is openable and closable. Under external force, the wedge-shaped block 6 can open; without external force, it can close, and when closed, it fits precisely into the conical inclined surface 3. In this embodiment, two wedge-shaped blocks 6 are provided between the pointed body 5 and the body 4, one upper and one lower. Two wedge-shaped blocks 6 are symmetrically arranged vertically. There are no specific restrictions on the model and length of the body 4 and the pointed body 5. In this embodiment, the body 4 is longer than the outer screw 1 to facilitate adjustment of the relative position of the inner screw 2. The pointed body 5 is bullet-shaped so that the entire tie rod can easily pass through the hole of the building template 12. The tail of the bullet-shaped pointed body 5 can easily block the wedge-shaped block 6, providing a support point for the wedge-shaped block 6. At the same time, in this embodiment, the pointed body 5 has the same diameter as the outer screw 1, which makes the tail of the pointed body 5 form a stable support point for the wedge-shaped block 6. It also makes it easy for the wedge-shaped block 6 to fit perfectly with the conical inclined surface 3 after closing, forming a smooth column, so that the tie rod can exit the hole of the building template 12.

[0038] It should be noted that the front and back are relative front and back. In this embodiment, one end of the pointed body 5 of the pull screw is the front and the other end is the back. In other words, the direction of insertion into the pull screw is the front end of the pull screw in this application. The directional description of all accessories of the pull screw in the entire text shall be based on the above directional description.

[0039] exist Figure 1 , Figure 2 and Figure 3In the commonly illustrated embodiment, a thread is provided on the outer side of the external threaded rod 1; a large nut 8 with threads is provided at the rear of the external threaded rod 1, and a wrench 9 is provided on the outer side of the large nut 8 for engaging the threads of the large nut 8 with the outer side of the external threaded rod 1; a handle 10 is provided at the rear end of the external threaded rod 1 for turning the external threaded rod 1; an inner nut 11 is provided at the rear end of the body 4 for adjusting the relative position of the inner threaded rod 2, so that when it is necessary to insert the tie rod into a similar building template 12 such as the inner and outer steel formwork of a thin-walled pier column, only the pointed part as the front end needs to be inserted into the inner and outer sides of the building template, so that the external threaded rod 1 and the inner threaded rod 2 pass through the inner and outer sides of the building template 12; and channel steel back ribs 13 are provided on the inner and outer sides of the building template, and then the threads are adjusted. The relative relationship between the inner and outer screws is used to adjust the spacing between the inner and outer sides of the building template. Once the spacing between the inner and outer sides of the building template is determined, the outer screw is turned forward or the inner screw is pulled back, so that the conical inclined surface of the outer screw moves forward relative to the inner screw, and the inner screw moves backward relative to the outer screw. This causes the front end of the outer screw 1 to support the wedge block 6, which in turn tightens the channel steel back rib 13 on the inner side of the building template 12. That is, the conical inclined surface of the outer screw 1 pushes up the wedge block 6 set between the pointed body 5 and the body 4, so that the wedge block 6 is tightened on the outer side of the inner building template 12. Then, the large nut 8 at the rear end of the outer screw 1 is adjusted. The large nut 8 is threaded with the outer screw 1 to tighten the channel steel back rib on the outer side of the building template 12. This ensures that the large nut 8 is close to the outer side of the outer building template 12, thereby tightening the tie rods on both sides of the building template.

[0040] exist Figure 1 , Figure 2 and Figure 3 In one specific embodiment shown, taking the reinforced concrete construction of the hollow thin-walled pier wall of a highway bridge as an example, the pier is 162 meters high, the net thickness of the thin-walled pier wall is 0.6 meters, the formwork 12 adopts a standardized steel formwork with a thickness of 4 mm, and its channel steel back ribs 13 adopt I... 12The channel steel, outer threaded rod 1, and inner threaded rod 2 of the tie rod are made of Q235 steel. The outer threaded rod 1 can be 70-80 cm long, with an outer diameter of 20-30 mm and a wall thickness of 3-5 mm. The inner threaded rod can have a diameter of 15-20 mm and a length of 80-90 mm. In this embodiment, the outer threaded rod 1 is 70 cm long, with an outer diameter of 24 mm and a wall thickness of 3 mm. The inner threaded rod has a diameter of 18 mm and a length of 80 mm. Each of the two wedge-shaped blocks 6 is 40 mm long. The bolts are 10mm wide, with fully threaded internal and external bolts. The handle 10 is welded to the rear end of the outer bolt 1, and the inner nut 11 is welded to the rear end of the inner bolt 2. The handle 10 is a ring handle to prevent it from obstructing the rotation of the inner nut 11. The tie bolts are installed according to the tie rod layout designed in the construction plan, with the pointed ends of the tie bolts inserted into the template holes of the steel template. The inner nut 11 is rotated counterclockwise, causing the inner bolt 2 to retract relative to the outer bolt 1, thus allowing the outer bolt 1 to move back onto the inner bolt 2. Wedge block 6 is pushed open (springs open) and secured to the channel steel back rib on the inner side of the high pier column wall. Then, wrench 9 is rotated so that the threads of large nut 8 are engaged with the outer thread rod 1. Large nut 8 is then tightened, securing it to the channel steel back rib on the outer side of the high pier column wall. Next, the spacing of the steel formwork on both the inner and outer sides and the transverse steel reinforcement supports (the ends of the steel reinforcement supports have special pads at their contact points with the inner side of the steel formwork) are checked. Foam plastic is sprayed onto the surface of the tie bolts between the steel formwork sections, and then concrete is poured. After the necessary time has passed, the mold will be removed. First, rotate the inner nut 11 at the tail of the inner bolt 2 clockwise so that the front end of the inner bolt 2 moves forward relative to the outer screw 1. This will cause the force exerted by the outer screw 1 on the wedge block 6 to disappear, and the wedge block 6 will automatically close under the action of the spring. After the wedge block 6 closes to its original state, it will form a column with the same diameter as the outer screw 1. Then, grasp the ring handle 10 and pull the column outward. The tie rod will then be completely pulled out. Clean the foam plastic and debris on the tie rod for future reuse.

[0041] The tie rod provided by this invention adjusts the relative relationship between the inner and outer screws by fitting the inner screw thread inside the cylindrical outer screw. A wedge block is placed between the pointed end and the main body of the inner screw, and this wedge block is hinged to the rear end of the pointed end by a compression spring, aligning with the tapered surface of the outer screw. Therefore, when inserting the tie rod into building formwork such as the inner or outer steel formwork of thin-walled piers, the pointed end is inserted into the inner or outer side of the formwork. The distance between the inner and outer sides of the formwork is adjusted by regulating the relative relationship between the threads of the inner and outer screws. Once the distance is determined, the outer screw is turned forward or the inner screw is pulled back, causing the tapered surface of the outer screw to move forward relative to the inner screw, and the inner screw to move backward relative to the outer screw. The conical inclined surface lifts the wedge-shaped block set between the pointed body and the main body. Then, the outer screw is kept stationary, and the inner screw is moved backward until the rear end of the wedge-shaped block is close to the inner side of the building formwork. Then, the large nut at the rear end of the outer screw is adjusted so that the large nut is close to the outer side of the building formwork, thereby fastening the tie rod to both sides of the building formwork. When the wall is built and the tie rod needs to be removed, simply move the inner screw forward relative to the outer screw so that the wedge-shaped block is not subjected to the pushing force of the outer screw, and the wedge-shaped block automatically closes under the action of the spring, so that the wedge-shaped block closes to its original state, making the wedge-shaped block a column with a diameter no larger than that of the outer screw. Thus, the entire closed tie rod can be pulled out of the building formwork, realizing the removal of the tie rod under the building formwork without removing the head nut clip of the tie rod, and realizing the repeated use of the tie rod.

[0042] The tie rod according to the present invention has been described above by way of example with reference to the accompanying drawings. However, those skilled in the art will understand that various modifications can be made to the tie rod proposed in the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. A tie screw, characterized in that, Includes an external screw and an internal screw, wherein, The external screw has a cylindrical structure, and, A tapered inclined surface is provided on the outer side of the front end of the external screw, and a thread is provided on the inner side of the external screw; The internal screw includes a body and a pointed part fixed to the front end of the body; the pointed part is bullet-shaped; and... The outer side of the body is also provided with threads, and the body passes through the external thread and is threaded with the external thread; Two wedge-shaped blocks are provided between the pointed body and the main body, and the two wedge-shaped blocks are arranged symmetrically. The wedge block is hinged to the rear end of the pointed body by a compression spring, and the wedge block matches the conical inclined surface. If the wedge block is closed, the wedge block is joined to the conical inclined surface, and the diameter of the wedge block closed on the conical inclined surface is not greater than the diameter of the external screw. The tail of the bullet-shaped tip can abut against the wedge block, providing a fulcrum for the wedge block; and the diameter of the bullet-shaped tip is the same as that of the external screw, so that the tail of the tip forms a stable fulcrum for the wedge block, and that the wedge block, when closed, fits perfectly with the conical inclined surface to form a smooth column, so as to exit the hole of the building template; The outer side of the external screw is provided with threads; A large nut with threads is provided at the rear of the external screw; A wrench is provided on the outside of the large nut, and the wrench is used to adjust the relative position of the large nut and the outer threads of the external screw. A handle is provided at the rear end of the external screw, and the handle is used to turn the external screw; An inner nut is provided at the rear end of the main body, and the inner nut is used to adjust the inner screw. The outer and inner screws penetrate the inner and outer sides of the building formwork; Channel steel back ribs are provided on both the inner and outer sides of the building formwork; Specifically, rotating the internal screw counterclockwise will cause the internal screw to move backward relative to the external screw and the external screw to move forward relative to the internal screw; rotating the internal screw clockwise will cause the internal screw to move forward relative to the external screw and the external screw to move backward relative to the internal screw; and rotating the external screw clockwise is equivalent to rotating the internal screw counterclockwise. If the wedge block opens, the rear end of the pointed body supports the wedge block, so that the wedge block fastens the channel steel back rib on the inner side of the building template; The large nut is threaded with the external threaded rod to fasten the channel steel back rib on the outside of the building template.

2. The tie screw as described in claim 1, characterized in that, The body is longer than the external screw.

3. The tie rod as described in claim 1 or 2, characterized in that, The internal screw is a solid screw.

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