Tunnel low side wall steel bar protection layer control turnover device

Abstract

The utility model relates to the technical field of turnover devices, in particular to a turnover device for controlling a tunnel short side wall steel bar protection layer. The method mainly aims at solving the problems that main reinforcements are additionally arranged on the clearance side of a side wall to control an inner side protection layer, for a tunnel with the large diameter, steel bar excess consumption is increased, and therefore the construction cost is increased, and when shuttle groove pouring and vibrating are adopted for an inverted arch side wall, steel bars are squeezed, and the protection layer is difficult to control. According to the technical scheme, the device comprises a side wall formwork and further comprises multiple sets of nuts, and the multiple sets of nuts are fixedly connected to the top of the side wall formwork at equal intervals; the first bolt is in threaded connection with the nut; the connecting rod is fixedly connected to the outer ring of the first bolt; and the multiple sets of first bolts are fixedly connected with the fixing rod. The secondary lining clearance side reinforcing steel bar connection structure ensures better connection of secondary lining clearance side reinforcing steel bars, ensures construction quality, can be recycled, saves the reinforcing steel bars and construction cost, and is remarkable in social benefit and economic benefit.

Description

Technical Field

[0001] This utility model relates to the field of flipping device technology, and in particular to a flipping device for controlling the protective layer of steel reinforcement in tunnel sidewalls. Background Technology

[0002] The thickness of the concrete cover for tunnel lining reinforcement directly affects the construction quality of the secondary lining. An excessively large concrete cover can negatively impact the structural strength of the lining and lead to safety hazards such as concrete cracking and spalling. Conversely, an insufficiently large cover can result in exposed reinforcement and rebar corrosion. Therefore, both excessively large and insufficiently large reinforcement in the secondary lining can seriously affect train operation safety, and the pass rate of the concrete cover thickness plays a crucial role in the overall quality of the tunnel secondary lining. Thus, during construction, strict control of the concrete cover thickness is necessary to ensure that the pass rate meets design and specification standards. In existing tunnel sidewall construction techniques, the spacing of longitudinal reinforcement bars is controlled by reinforcement clamps. While spacers can be used to control the cover thickness on the sidewall near the surrounding rock, using additional main reinforcement bars to control the inner cover thickness on the sidewall with clear clearance not only increases rebar consumption for larger diameter tunnels, leading to increased construction costs, but also causes rebar compression during shuttle casting and vibration compaction of the invert arch sidewall, making cover thickness control difficult. Therefore, this invention proposes a flip-up device for controlling the concrete cover of tunnel sidewall reinforcement. Utility Model Content

[0003] The purpose of this invention is to address the problems in the background technology where increasing the main reinforcement to control the inner protective layer on the sidewall clearance side not only increases steel consumption for tunnels with large diameters, thus increasing construction costs, but also causes the steel reinforcement to be squeezed and the protective layer to be difficult to control when the invert arch sidewall is cast and vibrated. The invention proposes a flip-up device for controlling the steel reinforcement protective layer of the tunnel sidewall.

[0004] The technical solution of this utility model is as follows: A controllable and reversible device for the protective layer of the steel reinforcement of a tunnel sidewall includes a sidewall template, and multiple sets of nuts, which are equidistantly fixed to the top of the sidewall template; a first bolt threaded into the nuts; a connecting rod fixedly connected to the outer ring of the first bolt; a fixing rod, to which the multiple sets of the first bolt are fixedly connected; and multiple sets of sidewall steel reinforcement connected to one side of the fixing rod, which are equidistantly arranged.

[0005] Optionally, a locking mechanism is also included at the connection position between the fixing rod and the side wall reinforcement, the locking mechanism being used to lock the side wall reinforcement to the side of the fixing rod.

[0006] Optionally, the locking mechanism includes an installation block disposed on the side of the fixing rod away from the side wall reinforcement. The installation block has an adapter groove corresponding to the fixing rod. Both sides of the adapter groove are provided with fastening rods rotatably connected in the installation block. The fastening rods are J-shaped and are sleeved on the outer ring of the side wall reinforcement.

[0007] Optionally, the two sets of fastening rods are arranged diagonally, and the outer ring of the fastening rod is fitted with a rubber sleeve, which is installed inside the mounting block.

[0008] Optionally, an adjusting block is fixedly connected to the end of the fastening rod away from the side wall reinforcement. The adjusting block has a T-shaped cross-section and an adjusting groove is provided at the end of the adjusting block away from the fastening rod.

[0009] Optionally, the locking mechanism further includes a movable plate disposed on the side of the mounting block away from the side wall reinforcement. One end of the fastening rod passes through the movable plate and is fixedly connected to the adjusting block. A threaded sleeve is fixedly connected to the side of the movable plate near the mounting block. A second bolt is threadedly connected to the threaded sleeve and is disposed in the middle of the movable plate.

[0010] Optionally, multiple sets of limiting rods are fixedly connected to the side of the mounting block near the moving plate. The limiting rods pass through the moving plate and are slidably connected to it. A limiting plate is fixedly connected to the end of the limiting rod away from the mounting block.

[0011] Optionally, a protective shell is fixedly connected to the outside of the mounting block, and the movable plate is slidably connected to the inside of the protective shell.

[0012] In summary, this application includes at least one of the following beneficial technical effects:

[0013] This utility model, through the setting of the first bolt, connecting rod and fixing rod, after the template is installed and positioned, flips the fixing rod and ties it with the side wall reinforcement on the side wall, so that the reinforcement protective layer is uniform and will not be squeezed or vibrated during concrete pouring, thus preventing the protective layer from changing.

[0014] Furthermore, the locking mechanism improves the ease of connecting the side wall reinforcement bars to the fixing rod, avoiding the complicated operation of wrapping wire, facilitating dismantling, and allowing for reuse, thus reducing construction costs.

[0015] In summary, this utility model ensures better connection of the steel bars on the clear side of the secondary lining, guarantees construction quality, and enables the recycling and saving of steel bars, thereby reducing construction costs and achieving significant social and economic benefits. Attached Figure Description

[0016] Figure 1 A schematic diagram of a reversible device for controlling the protective layer of steel reinforcement in tunnel sidewalls is provided.

[0017] Figure 2 for Figure 1 Installation diagram of the locking mechanism;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a cross-sectional structural diagram of the locking mechanism;

[0020] Figure 5 This is a cross-sectional schematic diagram of the locking mechanism.

[0021] Figure label:

[0022] 1. Side wall formwork; 2. Nut; 3. First bolt; 4. Connecting rod; 5. Fixing rod; 6. Side wall reinforcement;

[0023] 7. Locking mechanism; 71. Mounting block; 72. Adaptor groove; 73. Fastening rod; 74. Rubber cylinder; 75. Adjusting block; 76. Adjusting groove; 77. Moving plate; 78. Threaded sleeve; 79. Second bolt; 710. Limiting rod; 711. Limiting plate; 712. Protective shell. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0025] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0026] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Example 1

[0030] like Figure 1 As shown, this utility model proposes a controllable and reversible device for the protective layer of tunnel sidewall reinforcement, including a sidewall template 1 and multiple sets of nuts 2. The multiple sets of nuts 2 are equidistantly welded to the top of the sidewall template 1, and their positions are fixed. The multiple sets of nuts 2 are also aligned in a straight line. A first bolt 3 is threaded into the nut 2, and the diameter of both the nut 2 and the first bolt 3 is 20 mm. A connecting rod 4 is fixedly connected to the outer ring of the first bolt 3, allowing for rotational adjustment. The connecting rod 4 has a diameter of 18 mm and a length of 10 cm. Multiple sets of first bolts 3 are fixedly connected to a fixing rod 5, allowing for rotational adjustment. The fixing rod 5 has a diameter of 25 mm and a length of 12 m. Multiple sets of sidewall reinforcement 6 are connected to one side of the fixing rod 5, and the multiple sets of sidewall reinforcement 6 are equidistantly arranged. The fixing rod 5 and the sidewall reinforcement 6 are locked together with wire.

[0031] In this embodiment, according to the dimensions required by the design drawings, a 12m long fixed rod 5 is prepared, along with five 10cm long connecting rods 4, five sets of 20mm diameter nuts 2, and a first bolt 3. The nuts 2 are welded to the side wall template 1, with the nuts 2 welded on a straight line along the side wall template 1, at a distance of 15.5cm from the side wall template. After welding, the five connecting rods 4 are welded to the first bolts 3, ensuring that the connecting rods 4 extend 4.5cm into the side wall of the inverted arch after being flipped over. Finally, the fixed rod 5 is welded to the connecting rods 4.

[0032] The reinforcing bars are fabricated at the steel bar processing plant outside the tunnel according to the design requirements, transported to the site by material trucks, and then manually installed and tied. The invert arch reinforcing bars are pre-bent at the processing plant and connected on-site using cold-extruded sleeve connection technology. Reinforcing bar spacing is achieved using reinforcing bar positioning clips to ensure uniform spacing. Square steel is used for the clips, with two clips welded every 20cm, fixing the reinforcing bars between these points. The reinforcing bar clips are removed after construction is completed.

[0033] After the invert arch reinforcement is completed, the formwork is positioned. The invert arch lining formwork uses curved steel formwork. Before installation, the formwork's rigidity, dimensions, and flatness are carefully checked. Rust and other dirt are cleaned from the inside of the formwork, and a release agent is applied. Formwork installation is strictly carried out according to the surveyor's layout. After the formwork is positioned, the fixing rod 5 is tied to the side wall reinforcement 6 to ensure a uniform concrete cover and prevent changes in the cover due to compression or vibration during concrete pouring.

[0034] Example 2

[0035] like Figures 2 to 5As shown, based on Embodiment 1, a locking mechanism 7 is also included at the connection position between the fixing rod 5 and the side wall reinforcement 6. The locking mechanism 7 is used to lock the side wall reinforcement 6 to the side of the fixing rod 5, and at the same time facilitates reuse to reduce construction costs. The locking mechanism 7 includes an installation block 71 located on the side of the fixing rod 5 away from the side wall reinforcement 6. The installation block 71 has an adapter groove 72 corresponding to the fixing rod 5, which facilitates the installation block 71 being snapped onto one side of the fixing rod 5. Both sides of the adapter groove 72 are provided with fastening rods 73 rotatably connected to the installation block 71. The fastening rods 73 are J-shaped and are sleeved on the outer ring of the side wall reinforcement 6. The two sets of fastening rods 73 are diagonally arranged, so that when the installation block 71 approaches the installation block 71, it drives the fastening rods 73 to snap onto the side of the side wall reinforcement 6 away from the fixing rod 5, thereby fixing the side wall reinforcement 6 to the fixing rod 5. At the same time, rubber pads can be provided on the inner side of the adapter groove 72 and the side of the fastening rod 73 near the side wall reinforcement 6 to increase friction. A rubber sleeve 74 is fitted around the outer ring of the fastening rod 73. The rubber sleeve 74 is installed inside the mounting block 71. The rubber sleeve 74 is used to increase the friction when the fastening rod 73 rotates, so that the fastening rod 73 will encounter resistance when rotating. It is used to position the direction of the fastening rod 73 and prevent the fastening rod 73 from sagging under the influence of gravity. An adjusting block 75 is fixedly connected to the end of the fastening rod 73 away from the side wall reinforcement 6. The adjusting block 75 has a T-shaped cross-section, which facilitates increasing the contact area between the moving plate 77 and the adjusting block 75. An adjusting groove 76 is opened at the end of the adjusting block 75 away from the fastening rod 73. The setting of the adjusting groove 76 makes it easy to use a screwdriver to rotate the adjusting block 75, thereby driving the fastening rod 73 to rotate. Before the locking mechanism 7 is installed, the fastening rod 73 is rotated to move away from the side wall reinforcement 6. After the locking mechanism 7 is installed on one side of the fixed rod 5, the fastening rod 73 is rotated to rotate the fastening rod 73 to the side wall reinforcement 6. The locking mechanism 7 also includes a movable plate 77 disposed on the side of the mounting block 71 away from the side wall reinforcement 6. One end of the fastening rod 73 passes through the movable plate 77 and is fixedly connected to the adjusting block 75. When the movable plate 77 moves away from the mounting block 71, it pushes the adjusting block 75 to move, thereby causing the fastening rod 73 to move closer to the fixed rod 5 to clamp the side wall reinforcement 6. A threaded sleeve 78 is fixedly connected to the side of the movable plate 77 near the mounting block 71. A second bolt 79 is threadedly connected to the threaded sleeve 78. The second bolt 79 is disposed in the middle of the movable plate 77. When the second bolt 79 rotates, it moves along its own length direction. After one end of the second bolt 79 contacts the mounting block 71, the second bolt 79 continues to rotate and, through the reaction force, drives the movable plate 77 away from the mounting block 71, thereby causing the fastening rod 73 to move and squeeze the side wall reinforcement 6. Multiple sets of limiting rods 710 are fixedly connected to the side of the mounting block 71 near the movable plate 77. The limiting rods 710 pass through the movable plate 77 and are slidably connected to it to limit the movement of the movable plate 77, so that the movement of the movable plate 77 is smooth. The end of the limiting rod 710 away from the mounting block 71 is fixedly connected to a limiting plate 711, which is used to prevent the movable plate 77 from detaching.The outer side of the mounting block 71 is fixedly connected to the protective shell 712, and the movable plate 77 is slidably connected to the inner side of the protective shell 712 to play a protective role and prevent some soil from reaching its inner side and affecting the locking function of the locking mechanism 7.

[0036] In this embodiment, a screwdriver is used to rotate the adjusting block 75, causing the fastening rods 73 to rotate synchronously, so that the bending positions of the two sets of fastening rods 73 are far apart. At this time, the mounting block 71 is locked on one side of the contact position between the fixing rod 5 and the side wall reinforcement 6. Rotating the adjusting block 75 causes the bending position of the fastening rod 73 to rotate to the side of the side wall reinforcement 6 away from the fixing rod 5. At this time, the second bolt 79 is rotated, and the second bolt 79 moves along its own length direction. At this time, the second bolt 79 approaches the mounting block 71. When one end of the second bolt 79 contacts the mounting block 71, the second bolt 79 continues to rotate, causing the threaded sleeve 78 to move away from the mounting block 71, so that the moving plate 77 moves away from the mounting block 71 synchronously. At this time, the moving plate 77 pushes the adjusting block 75 to move, causing the fastening rod 73 to approach the fixing rod 5 and lock the side wall reinforcement 6, so that the side wall reinforcement 6 is fixed to one side of the fixing rod 5.

[0037] The above specific embodiments are merely several optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A reversible device for controlling the protective layer of steel reinforcement in tunnel sidewalls, comprising sidewall formwork (1), characterized in that, Also includes: Multiple sets of nuts (2) are fixedly connected at equal intervals to the top of the side wall template (1); The first bolt (3) is threaded into the nut (2); A connecting rod (4) is fixedly connected to the outer ring of the first bolt (3); The fixing rod (5) and multiple sets of the first bolts (3) are fixedly connected to the fixing rod (5); Multiple sets of side wall steel bars (6) are connected to one side of the fixing rod (5), and the multiple sets of side wall steel bars (6) are arranged at equal intervals.

2. The reversible device for controlling the protective layer of steel reinforcement in tunnel sidewalls according to claim 1, characterized in that, It also includes a locking mechanism (7) located at the connection position between the fixing rod (5) and the side wall reinforcement (6), the locking mechanism (7) being used to lock the side wall reinforcement (6) to the side of the fixing rod (5).

3. The reversible device for controlling the protective layer of steel reinforcement in tunnel sidewalls according to claim 2, characterized in that, The locking mechanism (7) includes an installation block (71) disposed on the side of the fixing rod (5) away from the side wall reinforcement (6). The installation block (71) has an adapter groove (72) corresponding to the fixing rod (5). Both sides of the adapter groove (72) are provided with fastening rods (73) rotatably connected in the installation block (71). The fastening rods (73) are J-shaped and are sleeved on the outer ring of the side wall reinforcement (6).

4. The reversible device for controlling the protective layer of steel reinforcement in tunnel sidewalls according to claim 3, characterized in that, The two sets of fastening rods (73) are arranged diagonally, and the outer ring of the fastening rod (73) is fitted with a rubber cylinder (74), which is installed inside the mounting block (71).

5. The reversible device for controlling the protective layer of steel reinforcement in tunnel sidewalls according to claim 4, characterized in that, An adjusting block (75) is fixedly connected to the end of the fastening rod (73) away from the side wall reinforcement (6). The adjusting block (75) has a T-shaped cross-section and an adjusting groove (76) is provided at the end of the adjusting block (75) away from the fastening rod (73).

6. The reversible device for controlling the protective layer of steel reinforcement in tunnel sidewalls according to claim 5, characterized in that, The locking mechanism (7) further includes a movable plate (77) disposed on the side of the mounting block (71) away from the side wall reinforcement (6). One end of the fastening rod (73) passes through the movable plate (77) and is fixedly connected to the adjusting block (75). A threaded sleeve (78) is fixedly connected to the side of the movable plate (77) near the mounting block (71). A second bolt (79) is threadedly connected in the threaded sleeve (78). The second bolt (79) is disposed through the middle position of the movable plate (77).

7. A reversible device for controlling the protective layer of steel reinforcement in tunnel sidewalls according to claim 6, characterized in that, The mounting block (71) is fixedly connected to a plurality of limiting rods (710) on the side near the moving plate (77). The limiting rods (710) pass through the moving plate (77) and are slidably connected thereto. The end of the limiting rod (710) away from the mounting block (71) is fixedly connected to a limiting plate (711).

8. The reversible device for controlling the protective layer of steel reinforcement in tunnel sidewalls according to claim 7, characterized in that, The mounting block (71) is fixedly connected to a protective shell (712) on the outside, and the movable plate (77) is slidably connected to the inside of the protective shell (712).

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