Tunnel radial hook reinforcement installation method

Abstract

The present invention provides a method for installing radial hook reinforcement in a tunnel, wherein the radial hook reinforcement includes a first bent portion and a portion to be bent that are opposed to each other. The method comprises hooking the first bent portion onto a first circumferential steel bar; applying pressure to the second longitudinal steel bar and the second circumferential steel bar using a pressure-assisting tool, thereby deforming the second longitudinal steel bar and the second circumferential steel bar in a direction proximal to the bent portion; bending the portion to be bent using a bending-assisting tool with a predetermined position as the bending center, thereby forming a second bent portion. The predetermined position is a position at a predetermined distance from the second circumferential steel bar in a direction away from the bent portion; releasing the pressure applied to the second longitudinal steel bar and the second circumferential steel bar, thereby allowing the second longitudinal steel bar and the second circumferential steel bar to recover their deformation, while simultaneously hooking the second bent portion onto the second circumferential steel bar. The present invention reduces construction costs and operational difficulty while ensuring the quality of steel bar bending.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction engineering, and in particular to a method for installing radial hook reinforcement in a tunnel. Background Art

[0002] During the secondary lining construction of the tunnel, the longitudinal hook reinforcement needs to be processed and tied on site according to the on-site dimensions, especially the installation of radial hook reinforcement, such as Figure 1 As shown, after fixing the bottom longitudinal reinforcement 911, the bottom circumferential reinforcement 912, the top longitudinal reinforcement 921 and the top circumferential reinforcement 922, the radial hook reinforcement 93 needs to be installed; first, the lower end portion 931 of the radial hook reinforcement 93 needs to be prefabricated in advance, and after the lower end portion 931 hooks the bottom circumferential reinforcement 912, the upper end portion 932 extending in a straight line is bent on site to form a second bent portion 932' in the shape of a hook.

[0003] Because the top annular reinforcement 922 must be used as the bending center to bend the straight-extending upper end 932, the top annular reinforcement 922 at the bending center hinders the use of auxiliary tools. Therefore, workers generally bend it manually. This method is not only difficult to operate, but also results in the use of radial hooks 93 that are much larger than the designed amount, increasing construction costs. Furthermore, the lengthened hooks are not manufactured to standard, affecting the quality of the binding. Summary of the Invention

[0004] The object of the present invention is to provide a tunnel radial hook reinforcement installation method which reduces the operation difficulty and helps to ensure the bending quality of the steel bars.

[0005] In the tunnel radial hook reinforcement installation method provided by the present invention, the radial hook reinforcement includes a relative first bent portion and a to-be-bent portion, and the tunnel radial hook reinforcement installation method includes: hooking the first bent portion on the first circumferential steel bar; using a pressure-assisting tool to apply pressure to the second longitudinal steel bar and the second circumferential steel bar so that the second longitudinal steel bar and the second circumferential steel bar are deformed in a direction close to the bent portion; using a bending-assisting tool to bend the to-be-bent portion with a preset position as the bending center to form a second bent portion, the preset position being a position at a preset distance from the second circumferential steel bar in a direction away from the bent portion; releasing the pressure applied to the second longitudinal steel bar and the second circumferential steel bar so that the second longitudinal steel bar and the second circumferential steel bar recover their deformation, and at the same time, the second bent portion is hooked on the second circumferential steel bar.

[0006] As can be seen from the above scheme, the present invention addresses the potential interference of longitudinal and circumferential bars with auxiliary tools. By leveraging the bending and deformation capabilities of the long longitudinal and circumferential bars, pressure is applied to the bars to prevent them from moving past the auxiliary tools. Once the bending is complete, the bars are released to reset, allowing the bent portion to naturally engage with the reset circumferential bars. This reduces construction costs and operational difficulty while ensuring the quality of the bar bends.

[0007] A further solution is that before the step of applying pressure to the second longitudinal reinforcement and the second circumferential reinforcement using a pressure-assisted tool to deform the second longitudinal reinforcement and the second circumferential reinforcement in a direction close to the bent portion, the second circumferential reinforcement is located at a preset position.

[0008] As can be seen from the above, the preset position is the position of the second annular reinforcement before elastic deformation occurs. Therefore, when the bending process is completed and the second annular reinforcement is reset, not only the second bent portion is hooked to the second annular reinforcement, but also the two are not loose and no adverse interaction force is generated.

[0009] Another further solution is that in the step of using a bending auxiliary tool to bend the portion to be bent with a preset position as the bending center to form a second bent portion, the step includes using a bending auxiliary tool to bend the portion to be bent 180 degrees with a preset position as the bending center to form a second bent portion.

[0010] A further solution is that, in the step of using a bending auxiliary tool to bend the portion to be bent 180 degrees with a preset position as the bending center to form a second bent portion, the second bent portion includes a first straight extension segment, a curved extension segment and a second straight extension segment connected in sequence, the first straight extension segment and the second straight extension segment are parallel to each other and extend in opposite directions; when the second bent portion is formed, the second circumferential steel bar is located between the first straight extension segment and the second straight extension segment.

[0011] As can be seen from the above, when the bending is completed and the second longitudinal reinforcement and the second circumferential reinforcement have not yet recovered their deformation, the second circumferential reinforcement is already located within the surrounding position of the second bent portion. This arrangement can avoid sudden loss of pressure in an emergency situation, which may cause the second circumferential reinforcement to move and detach from the second bent portion, thereby reducing the difficulty of construction.

[0012] A further solution is that the first circumferential reinforcement is located below the second circumferential reinforcement; and the step of applying pressure to the second longitudinal reinforcement and the second circumferential reinforcement using a pressure-assisting tool to cause the second longitudinal reinforcement and the second circumferential reinforcement to deform in a direction close to the bent portion includes applying downward pressure to the second longitudinal reinforcement and the second circumferential reinforcement using the pressure-assisting tool to cause the second longitudinal reinforcement and the second circumferential reinforcement to bend downward.

[0013] As can be seen from the above, it is easier for construction workers to apply downward pressure than to apply upward force.

[0014] A further solution is that in the step of using a pressure-assisting tool to apply pressure to the second longitudinal steel bars and the second circumferential steel bars so that the second longitudinal steel bars and the second circumferential steel bars are deformed in a direction close to the bent portion, the pressure-assisting tool, the second circumferential steel bars and the second longitudinal steel bars are abutted in sequence.

[0015] As can be seen from the above, the second annular reinforcement and the second longitudinal reinforcement are connected to each other, and the second longitudinal reinforcement can be pushed while applying pressure to the second annular reinforcement using a pressure-assisted tool, thereby making the operation simpler.

[0016] A further solution is that the pressure assisting tool and the bending assisting tool are integrated into the same handheld device.

[0017] As can be seen from the above, this setting is convenient for construction workers to hold and operate.

[0018] A further solution is that the pressure auxiliary tool is provided with a longitudinal steel bar hook structure and a circumferential steel bar hook structure. The longitudinal steel bar hook structure is used to hook with the longitudinal steel bars of the tunnel, and the circumferential steel bar hook structure is used to hook with the circumferential steel bars of the tunnel.

[0019] A further solution is that the bending auxiliary tool includes a rotation drive unit, a rotating pendulum member, a first pressure wheel and a second pressure wheel, and the rotation drive unit drives the rotating pendulum member to rotate; the first pressure wheel and the second pressure wheel are rotatably installed on the rotating pendulum member, and the rotating axes of the rotating pendulum member, the first pressure wheel and the second pressure wheel are arranged in sequence along a straight line; a radial hook rib passing position is formed between the first pressure wheel and the second pressure wheel, and the radial hook rib passing position is used for radial hook rib passing.

[0020] As can be seen above, the staggered arrangement of longitudinal and circumferential reinforcement provides reliable support points for the device, bringing stability to the subsequent radial hook bending operation. Placing the radial hook into the radial hook insertion position and activating the rotary drive unit with a switch causes the pendulum to rotate and bend the radial hook. Therefore, with the assistance of the handheld device, the difficulty of radial hook bending is effectively reduced, and the bending angle accuracy is controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the radial hook reinforcement installation method in the background technology.

[0022] Figure 2 This is a first structural diagram of an embodiment of a handheld device of the present invention.

[0023] Figure 3 FIG. 2 is a second structural diagram of an embodiment of a handheld device according to the present invention.

[0024] Figure 4 This is an enlarged view of the rotation drive unit in the embodiment of the handheld device of the present invention.

[0025] Figure 5 Schematic diagram of the first step in an embodiment of a method for installing radial hook reinforcement in a tunnel according to the present invention.

[0026] Figure 6 Schematic diagram of the second step in the embodiment of the tunnel radial hook reinforcement installation method of the present invention.

[0027] Figure 7 Schematic diagram of the third step in the embodiment of the tunnel radial hook reinforcement installation method of the present invention.

[0028] Figure 8 Schematic diagram of the fourth step in the embodiment of the tunnel radial hook reinforcement installation method of the present invention.

[0029] Figure 9 This is a schematic diagram of the completed installation state of an embodiment of the tunnel radial hook reinforcement installation method of the present invention. DETAILED DESCRIPTION

[0030] The radial hook reinforcement installation method in this embodiment is implemented using a handheld device, so the handheld device is described first. Figure 2 and Figure 3 The handheld device of this embodiment includes a main body 1, which is the pressure-assisted tool of the present invention. The main body 1 includes a handheld portion 11 and a hook portion 12 arranged opposite to each other. The main body 1 can be an integral component or can be made up of multiple parts fixedly connected. In this embodiment, the outer contour of the handheld portion 11 is in the shape of a pistol handle. A friction layer 119 is provided on the side of the handheld portion 11 away from the hook portion 12. The friction layer 119 is a rubber or silicone layer with continuous undulating wrinkles. The friction layer 119 is used to contact and cooperate with the base of the hand holding the handheld portion 11.

[0031] The handheld device also includes a squeeze trigger 61 and a reset button 62 movably mounted on the handheld portion 11. In the z-axis direction, the squeeze trigger 61 and the friction layer 119 are arranged on opposite sides of the handheld portion 11, and the reset button 62 is arranged on the surface side of the handheld portion 11 in the x-axis direction. The switch circuits corresponding to the squeeze trigger 61 and the friction layer 119 are electrically connected to the battery 64 arranged in the main body 1 through the line 63.

[0032] The hook portion 12 is provided with a longitudinal steel bar hook structure 13 and a circumferential steel bar hook structure 14, and the longitudinal steel bar hook structure 13 is provided with a longitudinal steel bar hook position 131. Figure 3As shown, the longitudinal steel bar hook position 131 is through along the x-axis direction, and the longitudinal steel bar hook position 131 has a first opening 133 opened toward the y-axis direction, and the inner surface of the longitudinal steel bar hook position 131 is a first concave arc surface 132. Along the y-axis direction, from the first opening 133 to the bottom of the longitudinal steel bar hook position 131, the depth h1 of the longitudinal steel bar hook position 131 is greater than the radius of the top longitudinal steel bar 921 to be inserted into the longitudinal steel bar hook position 131, and in this embodiment, the depth h1 of the longitudinal steel bar hook position 131 is greater than the diameter close to the top longitudinal steel bar 921.

[0033] See also Figure 2 A semi-shielded annular steel bar hook position 141 is provided on the annular steel bar hook structure 14. The annular steel bar hook position 141 is through along the y-axis direction, and the annular steel bar hook position 141 has a second opening 143 facing the z-axis direction. The inner surface of the annular steel bar hook position 141 is a second concave arc surface 142. Along the z-axis direction, the depth h2 from the second opening 143 to the bottom of the annular steel bar hook position 141 is less than the radius of the top-level annular steel bar 922, and the annular steel bar hook position 141 only blocks the top-level annular steel bar 922 from the positive direction of the x-axis.

[0034] Combine Figure 5 When using the handheld device, the top longitudinal steel bar 921 and the top circumferential steel bar 922 can be hooked into the longitudinal steel bar hook position 131 and the circumferential steel bar hook position 141 respectively. Since the extension directions of the top longitudinal steel bar 921 and the top circumferential steel bar 922 are staggered, this setting realizes the positioning of the device while providing a reliable force support point for the device, bringing stability to the subsequent bending work of the radial hook 93.

[0035] See also Figures 2 to 4 The handheld device also includes a bending mechanism for bending the radial hook rib 93. The bending mechanism is a bending assist tool according to the present invention. The bending mechanism includes a rotation drive unit disposed on the hook portion 12, a swing member 3, a first pressure roller 28, a second pressure roller 29, a baffle 4, a swing shaft 21, a first shaft 22, a second shaft 23, a first stopper 51, and a second stopper 52.

[0036] The rotation drive unit includes a motor 65, a driving gear 66, and a driven gear 67. The motor 65 is fixed to the hook portion 12. The driving gear 66 rotates coaxially with the output shaft of the motor 65. The driving gear 66 and the driven gear 67 are meshed. The swing shaft 21 is set at the first axis 101. The swing member 3 and the driven gear 67 are both connected to the swing shaft 21 and rotate coaxially. Figure 3 The motor 65 is powered by a battery 64, and pressing the trigger 61 and the reset button 62 can control the rotating pendulum 3 to rotate along the first rotation direction and the second rotation direction respectively.

[0037] Therefore, when the motor 65 is started, the swing member 3 can swing with the first axis 101 as the rotation axis; further, the first limit member 51 and the second limit member 52 are respectively arranged on the opposite sides of the hook portion 12, such as Figure 2 The swing member 3 is in the first extreme position. Figure 6 The swing member 3 is in the second extreme position. Figure 2 As shown, at this time, the first limit member 51 limits the swing member 3 from the second rotation direction, and the second rotation direction is the direction in which the swing member 3 rotates from the second extreme position to the first extreme position; Figure 6 As shown, at this time, the second limiting member 52 limits the swing member 3 from the first rotation direction, and the first rotation direction is the direction in which the swing member 3 rotates from the first extreme position to the second extreme position.

[0038] See also Figure 2 The first rotating shaft 22 and the second rotating shaft 23 are both connected to the swing portion of the swing member 3, and the first rotating shaft 22 and the second rotating shaft 23 are respectively located at the second axis 102 and the third axis 103. Figure 2 It can be seen that the swing shaft 21 , the first shaft 22 and the second shaft 23 are parallel to each other, and on the axial projection of the first axis 101 , the swing shaft 21 , the first shaft 22 and the second shaft 23 are arranged in sequence along a straight line with intervals.

[0039] The first pressing wheel 28 is rotatably connected to the first rotating shaft 22, and the second pressing wheel 29 is rotatably connected to the second rotating shaft 23. The outer diameter of the second pressing wheel 29 is larger than the outer diameter of the first pressing wheel 28. There is a gap between the first pressing wheel 28 and the second pressing wheel 29 to form a radial hook rib passing position 100 for the radial hook rib 93 to pass through. Figure 2 and Figure 6 As shown, when the swing member 3 is in the first extreme position and the second extreme position, the radial hook ribs pass through position 100 along the z-axis direction. It can be seen that the angle through which the swing member 3 rotates from the first extreme position to the second extreme position is exactly 180 degrees.

[0040] In addition, the radial hook rib passing position 100 has an entrance facing the y-axis direction. This configuration makes it easier for the radial hook rib 93 to enter the radial hook rib passing position 100. In order to ensure that the radial hook rib 93 is in the radial hook rib passing position 100 during bending, a detachable baffle 4 is provided. The baffle 4 includes a rotating engagement portion 41 and a swing end 42 arranged opposite to each other. The rotating engagement portion 41 is rotatably connected to the second rotating shaft 23. The swing end 42 is provided with a U-shaped bayonet 421. The baffle 4 can rotate along the third axis 103 between a release position and a blocking position. Figure 2 The baffle 4 is shown in the released position, at which point the baffle 4 does not block the entrance of the radial hook through the position 100; Figure 5 and Figure 6The baffle 4 is shown in the released position, at which time the baffle 4 blocks the entrance of the radial hook rib passing through the position 100 from the y-axis direction, and at this time the U-shaped bayonet 421 is buckled onto the first rotating shaft 22 to achieve a detachable connection.

[0041] See also Figures 2 to 4 The tunnel radial hook reinforcement installation method of the present invention comprises:

[0042] First, the handheld device of the present invention or other steel bar bending machines are used to process the lower end portion 931 of the radial hook bar 93 into a first bent portion, while the upper end portion 932 is not bent and serves as the portion to be bent of the present invention.

[0043] See also Figure 5 Then, first hook the lower end 931 onto the bottom circumferential reinforcement 912, and then extend the upper end 932 upward to the intersection between the top longitudinal reinforcement 921 and the top circumferential reinforcement 922. The bottom circumferential reinforcement 912 is the first circumferential reinforcement of the present invention, and the top longitudinal reinforcement 921 and the top circumferential reinforcement 922 are the second longitudinal reinforcement and the second circumferential reinforcement of the present invention, respectively.

[0044] Then, place the handheld device until the top longitudinal steel bar 921 enters the longitudinal steel bar hook position 131, the top annular steel bar 922 enters the annular steel bar hook position 141, and the upper end 932 enters the radial hook passing position 100. Then operate the baffle 4 to reach the blocking position.

[0045] Then the staff needs to press the handheld device down with the handheld part 11, thereby applying pressure to the top longitudinal steel bars 921 and the top circumferential steel bars 922. The upper retaining wall of the circumferential steel bar hook position 141, the top circumferential steel bars 922 and the top longitudinal steel bars 921 abut and interact with each other in turn, causing the top longitudinal steel bars 921 and the top circumferential steel bars 922 to undergo elastic bending deformation in the direction close to the lower end 931.

[0046] Combine Figure 6 The swing axis 21 is the bending center of the second bent portion 932'. The preset position of the swing axis 21 is the position of the top annular reinforcement 922 before elastic bending deformation occurs. The trigger 61 is then pulled to rotate the swing member 3 in the first rotational direction around the swing axis 21 until it reaches the second limit position. During this process, the upper end portion 932, under the action of the first and second pressure rollers 28 and 29, completes a 180-degree bend, forming the hook-shaped second bent portion 932'.

[0047] See also Figure 7The second bent portion 932' includes a first straight extension segment 9321, a curved extension segment 9322, and a second straight extension segment 9323 connected in sequence. The first straight extension segment 9321 and the second straight extension segment 9323 are parallel to each other and extend in opposite directions. When the second bent portion 932' is formed, the top circumferential reinforcement 922 is located between the first straight extension segment 9321 and the second straight extension segment 9323.

[0048] Continue to see Figure 7 , and then operate the baffle 4 to reach the release position, so that the baffle 4 releases the obstruction of the entrance of the radial hook through the position 100.

[0049] Recombination Figure 8 and Figure 9 After the handheld device is removed, the top longitudinal reinforcement 921 and the top circumferential reinforcement 922 recover their deformations, so that the second bent portion 932 ′ hooks the top circumferential reinforcement 922 .

[0050] Because the longitudinal and circumferential steel bars extend in intersecting directions, the handheld device first coordinates with the longitudinal and circumferential steel bars to achieve positioning and obtain a force support point, providing stability for the subsequent radial rebar bending operation. Because the longitudinal and circumferential steel bars may interfere with the swing of the counter-rotating pendulum, the bending and deformation capabilities of the long longitudinal and circumferential steel bars are utilized to apply pressure to the longitudinal and circumferential steel bars to avoid the rotating pendulum. After the bending operation is completed, the longitudinal and circumferential steel bars are released to reset, and the bent portion naturally hooks with the reset circumferential steel bars. This invention reduces construction costs and ensures the quality of rebar bending.

[0051] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for installing radial hook reinforcement in a tunnel, wherein the radial hook reinforcement comprises a first bent portion and a portion to be bent opposite to each other, characterized in that: The tunnel radial hook reinforcement installation method includes: Hooking the first bent portion onto the first circumferential steel bar; Applying pressure to the second longitudinal steel bars and the second circumferential steel bars using a pressure-assisting tool so that the second longitudinal steel bars and the second circumferential steel bars are deformed in a direction close to the bent portion; Using a bending auxiliary tool, the portion to be bent is bent with a preset position as a bending center to form a second bent portion, wherein the preset position is a position at a preset distance from the second circumferential steel bar in a direction away from the bent portion; releasing the pressure applied to the second longitudinal reinforcement and the second circumferential reinforcement to restore the deformation of the second longitudinal reinforcement and the second circumferential reinforcement, while the second bent portion is hooked on the second circumferential reinforcement; The pressure assisting tool and the bending assisting tool are integrated into the same handheld device; The pressure auxiliary tool is provided with a longitudinal steel bar hook structure and a circumferential steel bar hook structure, wherein the longitudinal steel bar hook structure is used to hook with the longitudinal steel bars of the tunnel, and the circumferential steel bar hook structure is used to hook with the circumferential steel bars of the tunnel; The bending auxiliary tool comprises a rotation driving unit, a rotating swing member, a first pressing wheel and a second pressing wheel, wherein the rotation driving unit drives the rotating swing member to rotate; The first pressing wheel and the second pressing wheel are rotatably mounted on the swing member, and the rotation axes of the swing member, the first pressing wheel and the second pressing wheel are sequentially arranged along a straight line; A radial hook rib passing position is formed between the first pressing wheel and the second pressing wheel, and the radial hook rib passing position is used for the radial hook rib to pass through.

2. The method for installing radial hook reinforcement in a tunnel according to claim 1, characterized in that: Before the step of applying pressure to the second longitudinal reinforcement and the second circumferential reinforcement using a pressure-assisting tool to deform the second longitudinal reinforcement and the second circumferential reinforcement in a direction close to the bent portion, the second circumferential reinforcement is located at the preset position.

3. The method for installing radial hook reinforcement in a tunnel according to claim 1, characterized in that: The step of using a bending auxiliary tool to bend the portion to be bent with a preset position as the bending center to form a second bent portion includes: The portion to be bent is bent 180 degrees with a preset position as a bending center using a bending auxiliary tool so as to form a second bent portion.

4. The method for installing radial hook reinforcement in a tunnel according to claim 3, characterized in that: The step of using a bending auxiliary tool to bend the portion to be bent 180 degrees with a preset position as the bending center so that the portion to be bent forms a second bent portion includes: The second curved portion includes a first straight extension segment, a curved extension segment, and a second straight extension segment connected in sequence, wherein the first straight extension segment and the second straight extension segment are parallel to each other and extend in opposite directions; When the second bent portion is formed, the second circumferential reinforcement is located between the first straight extension segment and the second straight extension segment.

5. The method for installing radial hook reinforcement in a tunnel according to any one of claims 1 to 4, characterized in that: The first annular reinforcement is located below the second annular reinforcement; The step of applying pressure to the second longitudinal steel bars and the second circumferential steel bars using a pressure-assisting tool so as to deform the second longitudinal steel bars and the second circumferential steel bars in a direction close to the bent portion includes: The pressure-assisted tool is used to apply downward pressure to the second longitudinal steel bars and the second circumferential steel bars so that the second longitudinal steel bars and the second circumferential steel bars are bent and deformed downward.

6. The method for installing radial hook reinforcement in a tunnel according to any one of claims 1 to 4, characterized in that: The step of applying pressure to the second longitudinal steel bars and the second circumferential steel bars using a pressure-assisting tool so as to deform the second longitudinal steel bars and the second circumferential steel bars in a direction close to the bent portion includes: The pressure auxiliary tool, the second annular steel bar and the second longitudinal steel bar are abutted in sequence.

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