Road tunnel trench cover plate cast-in-place movable formwork

Abstract

The utility model discloses a kind of highway tunnel trench cover plate cast-in-place movable form, belong to tunnel engineering technical field, the bottom mould of the present device is formed when cover plate pouring by fixed form and two movable forms, movable form is slidably arranged below fixed form, and the spacing between two movable forms is adjusted by driving unit, so that form assembly can adapt to different width of trench within a certain range, most importantly, by the adjustment of movable form spacing, movable form can always closely adhere to the side of trench, avoid pouring material from the gap between bottom mould and the side of trench to leak in trench during cover plate pouring process, increase the applicability of overall device.

Description

Technical Field

[0001] This utility model relates to the field of tunnel engineering technology, specifically to a cast-in-place movable template for highway tunnel trench cover plates. Background Technology

[0002] In tunnel engineering, trench covers are mainly made in two ways: precast and cast-in-place. Each method has its own advantages, and the choice should be made according to the specific construction conditions. When casting trench covers in place, a cast-in-place movable formwork is required as the bottom formwork. For example, Chinese utility model patent CN212406747U discloses an integral movable formwork for the construction of cast-in-place cover slabs for the central drainage ditch of a tunnel auxiliary structure. The integral movable formwork includes a traveling trolley with wheels underneath, a channel steel crossbeam on the trolley, a steel pipe longitudinal beam on the channel steel crossbeam, a bottom formwork template above the steel pipe longitudinal beam, and a support hanger. Vertical connecting parts are arranged downwards on the horizontal supports of the support hanger. The vertical connecting parts include spiral threads and spiral rods. The threaded portions below the spiral threads and spiral rods are connected to an intermediate partition plate through PVC pre-drilled holes. The intermediate partition plate is fixedly connected to the bottom formwork template. Rotating the spiral threads and spiral rods can drive the intermediate partition plate and the bottom formwork template to rise and fall.

[0003] In existing movable formwork, the bottom formwork uses a fixed-size formwork. The formwork is designed according to the size of the trench. However, since the formwork needs to be moved within the trench to change the construction position, the formwork cannot fit tightly against the side of the trench. A gap needs to be left between the formwork and the side of the trench when designing the formwork. This causes concrete to enter the gap between the bottom formwork and the trench during the pouring process, resulting in the gap between the bottom formwork and the trench being filled, which affects the normal demolding of the bottom formwork.

[0004] Based on this, this utility model designs a cast-in-place movable formwork for highway tunnel trench covers to solve the above problems. Utility Model Content

[0005] This utility model provides a cast-in-place movable formwork for highway tunnel trench covers to solve the technical problem of...

[0006] According to one aspect of the present invention, a movable formwork for cast-in-place trench cover plates in highway tunnels is provided, comprising a movable base and a formwork assembly fixed to the top of the movable base. The formwork assembly includes a fixed formwork, a movable formwork, and a driving unit. The fixed formwork is fixed to the top of the movable base. Two movable formworks are provided, which are slidably arranged on opposite sides below the fixed formwork in a horizontal direction. The driving unit is used to drive the two movable formworks to move closer to or further away from each other. The movable formworks are used to abut against the side of the trench in the width direction and together with the fixed formwork to form a bottom mold.

[0007] As a further embodiment of this utility model, the template assembly also includes a frame fixedly disposed at the bottom end of the fixed template, and a slide rail is formed between the frame and the bottom surface of the fixed template for the movable template to be slidably installed.

[0008] As a further embodiment of this utility model, the driving unit includes a lead screw, a nut, and a connecting arm. The lead screw is rotatably disposed below the fixed template and is located between the two movable templates. The nut is threaded onto the lead screw and is used to move along the length of the lead screw under the drive of the lead screw. The nut is connected to both movable templates through at least one connecting arm, and the connecting arm is rotatably connected to the nut and the movable templates.

[0009] As a further embodiment of this utility model, the movable template has a receiving groove for accommodating the connecting arm on the side near the lead screw, and the connecting arm is rotatably connected to the inside of the receiving groove.

[0010] As a further embodiment of this utility model, the connecting arm and the movable template are offset in the vertical direction, and the connecting arm is rotatably connected to the bottom surface of the movable template.

[0011] As a further embodiment of this utility model, one end of the lead screw extends beyond the vertical projection of the fixed template, and a knob is fixedly provided at the end of the lead screw that extends beyond the fixed template.

[0012] As a further embodiment of this utility model, the frame has an assembly hole on its side, and a lifting ring can be detachably installed in the assembly hole.

[0013] As a further embodiment of this utility model, the mobile base includes a base frame, wheels, and support legs. The wheels and support legs are both located on the bottom surface of the base frame. The wheels are used to support the base frame on the ground so that it can move on the ground. The height of the support legs is adjustable so that they can support the base frame on the ground and suspend the wheels.

[0014] As a further embodiment of this utility model, the traveling wheel is a swivel wheel.

[0015] As a further embodiment of this invention, the support leg is a hydraulic telescopic cylinder.

[0016] This utility model has the following beneficial effects: This device forms the bottom mold for cover plate casting using a fixed template and two movable templates. The movable templates are slidably positioned below the fixed template, and the distance between the two movable templates is adjusted by a drive unit. This allows the template assembly to adapt to trenches of different widths within a certain range. Most importantly, by adjusting the distance between the movable templates, the movable templates can always be kept in close contact with the side of the trench, preventing the casting material from leaking into the trench through the gap between the bottom mold and the side of the trench during cover plate casting, thus increasing the applicability of the overall device.

[0017] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the template component structure of this utility model; Figure 3 A schematic diagram of the structure of the movable template with a receiving groove in this utility model; Figure 4 This is a schematic diagram of the vertical misalignment structure between the movable template and the connecting arm in this utility model; Figure 5 This is a schematic diagram of the movable base in this utility model.

[0019] Legend: 1. Mobile base; 11. Base frame; 12. Traveling wheels; 13. Support legs; 2. Template assembly; 21. Fixed template; 22. Movable template; 221. Receiving slot; 23. Drive unit; 231. Lead screw; 232. Nut; 233. Connecting arm; 24. Frame; 241. Assembly hole; 242. Lifting ring. Detailed Implementation

[0020] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0021] Please see Figure 1-5This utility model provides a technical solution: a cast-in-place movable template for a highway tunnel trench cover, including a movable base 1 and a template assembly 2 fixed to the top of the movable base 1. The template assembly 2 includes a fixed template 21, a movable template 22, and a driving unit 23. The fixed template 21 is fixed to the top of the movable base 1. There are two movable templates 22, which are slidably arranged on opposite sides below the fixed template 21 in the horizontal direction. The driving unit 23 is used to drive the two movable templates 22 to move closer or further away from each other. The movable templates 22 are used to abut against the side in the trench width direction and together with the fixed template 21 form the bottom mold. During operation, the entire assembly is first hoisted into the trench where the cover plate needs to be poured. The fixed template 21 is then moved to the processing position using the movable base 1. Next, the fixed template 21 and the movable template 22 are raised to a preset height using the movable base 1. Finally, the drive unit 23 drives the two movable templates 22 away from each other, so that they abut against both sides of the trench width. At this point, the fixed template 21 and the movable template 22 close the trench opening, forming a bottom mold within the trench. The pouring of the trench cover plate can then begin. After pouring is complete and the cover plate concrete reaches its strength, the movable base 1 lowers the fixed template 21 and the movable template 22, allowing them to be demolded from the poured cover plate. The template assembly 2 is then moved to the next pouring position using the movable base 1. like Figure 1-5 As shown, this device forms the bottom mold for the cover plate casting by a fixed template 21 and two movable templates 22. The movable templates 22 are slidably set below the fixed template 21, and the distance between the two movable templates 22 is adjusted by the drive unit 23, so that the template assembly 2 can adapt to trenches of different widths within a certain range. Most importantly, by adjusting the distance between the movable templates 22, the movable templates 22 can always be kept close to the side of the trench, preventing the casting material from leaking into the trench through the gap between the bottom mold and the side of the trench during the cover plate casting process, thus increasing the applicability of the overall device.

[0022] Specifically, since the movable template 22 is slidably set below the fixed template 21, a height difference will inevitably be formed between the top surface of the movable template 22 and the top surface of the fixed template 21. When pouring through the template assembly 2, the top surface of the movable template 22 needs to be aligned with the top surface of the trench. In this way, the bottom surface of the cover plate will not invade the trench, while the main template will form a groove on the bottom surface of the cover plate, which will not affect the normal use of the cover plate.

[0023] Furthermore, the template assembly 2 also includes a frame 24 fixedly disposed at the bottom end of the fixed template 21, and a slide rail is formed between the frame 24 and the bottom surface of the fixed template 21 for the movable template 22 to be slidably installed. like Figure 3As shown, in order to slide the movable template 22 under the fixed template 21, a frame 24 is fixedly installed under the fixed template 21. The frame 24 has a groove in the middle and the top of the groove is an open structure. After the frame 24 is installed at the bottom of the fixed template 21, the fixed template 21 can close the top of the groove, thereby forming a slide between the frame 24 and the fixed template 21 for the sliding template to slide in. By using the fixed template 21 directly as the top surface of the slide, the height difference between the fixed template 21 and the movable template 22 can be reduced, so that the bottom of the final cover plate is as flat as possible. At the same time, the height of the slide is matched with the height of the movable template 22, so that the movable template 22 can slide smoothly in the slide.

[0024] Furthermore, the drive unit 23 includes a lead screw 231, a nut 232, and a connecting arm 233. The lead screw 231 is rotatably disposed below the fixed template 21 and is located between the two movable templates 22. The nut 232 is threaded onto the lead screw 231 and is used to move along the length of the lead screw 231 under the drive of the lead screw 231. The nut 232 is connected to both movable templates 22 by at least one connecting arm 233. The connecting arm 233 is rotatably connected to the nut 232 and the movable templates 22, and the length of the connecting arm 233 is greater than the distance between the nut 232 and the movable templates 22. like Figure 3As shown, in order to simultaneously drive the movement of two movable templates 22, a lead screw 231 is rotatably installed below the fixed template 21. A nut 232 is threaded onto the lead screw 231. By rotating the lead screw 231, the nut 232 can be moved along the length direction of the lead screw 231. Subsequently, at least one connecting arm 233 is rotatably installed on each side of the nut 232. The end of the connecting arm 233 away from the nut 232 is connected to the movable template 22. The length direction of the lead screw 231 is the same as the length direction of the fixed template 21. When the lead screw 231 rotates, the nut 232 moves along the length direction of the fixed template 21, thereby driving the end of the connecting arm 233 away from the movable template 22 to move. Since the end of the connecting arm 233 connected to the movable template 22 cannot move along the length direction of the fixed template 21, the angle of the connecting arm 233 changes when the nut 232 moves. When the angle of the connecting arm 233 changes, its position along the length direction of the fixed template 21... The projected length will change. When the projected length of the connecting arm 233 in the length direction of the fixed template 21 increases, the connecting arm 233 will push the movable template 22 away from the nut 232. When the projected length of the connecting arm 233 in the length direction of the fixed template 21 decreases, the connecting arm 233 will pull the movable template 22 closer to the nut 232, thereby realizing the movement of the movable template 22. Since the nut 232 is connected to the two movable templates 22 respectively through the connecting arms 233 on its left and right sides, the movement of the nut 232 can simultaneously drive the two movable templates 22 to move, and the two movable templates 22 move in opposite directions. This can achieve the effect of adjusting the distance between the two movable templates 22. After the position of the movable template 22 is adjusted, as long as the position of the nut 232 on the screw 231 does not change, the distance between the two movable templates 22 will also not change, which has a self-locking effect and can ensure the stability of the movable template 22 during the subsequent pouring process. Preferably, the connection position between the connecting arm 233 and the movable template 22 is located in the middle of the length direction of the movable template 22. When the movable template 22 is moved by pulling or pushing it through the connecting arm 233, the position where the connecting arm 233 applies driving force is located in the middle of the length direction of the movable template 22, so as to avoid the movable template 22 from getting stuck due to the force position deviating from the center. Specifically, the number of connecting arms 233 on one side of the nut 232 is at least one. In this example, there is a connecting arm 233 on both the left and right sides of the nut 232.

[0025] In some examples, the movable template 22 has a receiving groove 221 for accommodating the connecting arm 233 on the side near the lead screw 231, and the connecting arm 233 is rotatably connected to the inside of the receiving groove 221. like Figure 3As shown, in order for the connecting arm 233 to smoothly push the movable template 22 to move, in the initial state, the connecting arm 233 needs to maintain a certain angle with the lead screw 231. This will cause the connecting arm 233 to encroach on the space of the movable template 22 in the width direction in the initial state. Therefore, a receiving groove 221 is opened on the side of the movable template 22 near the nut 232. The connection position between the connecting arm 233 and the movable template 22 is located inside the receiving groove 221. The receiving groove 221 can accommodate the connecting arm 233 within it. Thus, the movable template 22 moves closer to the connecting arm 233. One side can be closer to the nut 232, which increases the overall width of the movable template 22 and the portion of the movable template 22 located within the slide. When the movable template 22 is under force, the slide will provide better support for the movable template 22, making the movable template 22 more stable during use. Similarly, the larger the area of ​​the portion of the movable template 22 located within the slide, the larger the contact area between the movable template 22 and the fixed template 21, resulting in better support for the fixed template 21. This increases the stability of both the movable template 22 and the fixed template 21. In other examples, the connecting arm 233 is offset from the movable template 22 in the vertical direction, and the connecting arm 233 is rotatably connected to the bottom surface of the movable template 22; like Figure 4 As shown, in order to prevent the connecting arm 233 from encroaching on the space in the width direction of the movable template 22, the connecting arm 233 and the movable template 22 are installed in a staggered manner in the vertical direction. In this way, the connecting arm 233 will not encroach on the space of the movable template 22 in the width direction. The side of the movable template 22 closer to the connecting arm 233 can be closer to the nut 232, which increases the overall width of the movable template 22. The portion of the movable template 22 located within the slide rail is larger. When the movable template 22 is under force, the slide rail provides better support for the movable template 22, making the movable template 22 more stable during use. Similarly, the larger the area of ​​the portion of the movable template 22 located within the slide rail, the larger the contact area between the movable template 22 and the fixed template 21, and the better the support effect for the fixed template 21. This increases the stability of both the movable template 22 and the fixed template 21. Preferably, the bottom surface of the slide groove on the frame 24 is provided with a groove, and the connecting arm 233 is located in the groove, so that the bottom surface of the slide groove on the frame 24 can still contact the bottom surface of the movable template 22, thus preventing the bottom surface of the movable template 22 from being suspended.

[0026] Furthermore, one end of the lead screw 231 extends beyond the vertical projection of the fixed template 21, and a knob is fixedly provided at the end of the lead screw 231 that extends beyond the fixed template 21. like Figure 3As shown, in order to facilitate the rotation of the lead screw 231, one end of the lead screw 231 extends from below the fixed template 21, and a knob is installed at the extended end of the lead screw 231. When it is necessary to adjust the position between the two movable templates 22, the lead screw 231 can be quickly rotated by the knob, making it more convenient to use.

[0027] Furthermore, the frame 24 has an assembly hole 241 on its side, and a lifting ring 242 can be detachably installed in the assembly hole 241. like Figure 2 As shown, threaded holes are opened on both sides of the frame 24 along its length. The two threaded holes on the same side are distributed at both ends of the frame 24 along its width. When it is necessary to hoist the whole device, the hoisting ring 242 can be assembled into the assembly hole 241, and then the whole device can be hoisted by hoisting equipment.

[0028] Furthermore, the mobile base 1 includes a base frame 11, wheels 12, and support legs 13. The wheels 12 and support legs 13 are both located on the bottom surface of the base frame 11. The wheels 12 are used to support the base frame 11 on the ground so that the base frame 11 can move on the ground. The height of the support legs 13 is adjustable so that they can support the base frame 11 on the ground and allow the wheels 12 to be suspended in the air. like Figure 5 As shown, in order to enable the template assembly 2 to move within the trench, the mobile base 1 includes wheels 12. After the entire device is hoisted into the trench, the mobile base 1 can drive the template assembly 2 to move along the length of the trench, thereby allowing on-site pouring of the cover plates at different locations in the trench. At the same time, in order to ensure that the template assembly 2 can be stably supported, the mobile base 1 also includes support legs 13. The height of the support legs 13 can be adjusted. When the template assembly 2 moves to the designated position, the support legs 13 extend and support the bottom surface of the trench, and the wheels 12 are suspended in the air. At this time, the template assembly 2 is only supported by the support legs 13, and the entire device will not be able to move, which can ensure the stability of the template assembly 2 during the subsequent pouring process. Furthermore, there are four walking wheels 12 and four support legs 13. The four walking wheels 12 are located near the four corners of the base frame 11. Similarly, the four support legs 13 are also located near the four corners of the base frame 11. Furthermore, such as Figure 5 As shown, the traveling wheel 12 is a universal wheel. The traveling wheel 12 includes a rotating seat and a wheel body. The rotating seat is fixed on the base frame 11. The wheel body is rotatably mounted on the rotating seat, and the rotation axis of the wheel body is perpendicular to the horizontal plane. After the whole device is hoisted into the trench, the movable base 1 can drive the template assembly 2 to move freely in the horizontal direction, so that both movable templates 22 can be in close contact with the side of the trench, making it more convenient to move the template assembly 2 in the width direction of the trench. like Figure 5As shown, the support leg 13 is a hydraulic telescopic cylinder, which extends and retracts by hydraulic drive, making it more convenient to use.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A movable formwork for cast-in-place trench cover plates in highway tunnels, comprising a movable base (1) and a formwork assembly (2) fixed to the top of the movable base (1), characterized in that: The template assembly (2) includes a fixed template (21), a movable template (22), and a driving unit (23). The fixed template (21) is fixed to the top of the movable base (1). There are two movable templates (22). The two movable templates (22) are slidably arranged on opposite sides below the fixed template (21) in the horizontal direction. The driving unit (23) is used to drive the two movable templates (22) to move closer or further away from each other. The movable templates (22) are used to abut against the side in the width direction of the groove and form a bottom mold together with the fixed template (21).

2. A highway tunnel trench cover plate cast-in-situ movable formwork according to claim 1, characterized in that: The template assembly (2) also includes a frame (24) fixedly installed at the bottom of the fixed template (21), and a slide is formed between the frame (24) and the bottom surface of the fixed template (21) for the movable template (22) to be slidably installed.

3. A highway tunnel trench cover plate cast-in-situ movable formwork according to claim 1, characterized in that: The drive unit (23) includes a lead screw (231), a nut (232), and a connecting arm (233). The lead screw (231) is rotatably disposed below the fixed template (21) and is located between two movable templates (22). The nut (232) is threaded onto the lead screw (231) and is used to move along the length of the lead screw (231) under the drive of the lead screw (231). The nut (232) is connected to both movable templates (22) through at least one connecting arm (233). The connecting arm (233) is rotatably connected to the nut (232) and the movable templates (22).

4. A highway tunnel trench cover plate cast-in-situ movable formwork according to claim 3, characterized in that: The movable template (22) has a receiving groove (221) for accommodating the connecting arm (233) on the side near the lead screw (231), and the connecting arm (233) is rotatably connected to the inside of the receiving groove (221).

5. A highway tunnel trench cover plate cast-in-situ movable formwork according to claim 3, characterized in that: The connecting arm (233) and the movable template (22) are offset in the vertical direction, and the connecting arm (233) is rotatably connected to the bottom surface of the movable template (22).

6. A highway tunnel trench cover plate cast-in-situ movable formwork according to claim 3, characterized in that: One end of the lead screw (231) extends beyond the vertical projection of the fixed template (21), and a knob is fixedly provided at the end of the lead screw (231) that extends beyond the fixed template (21).

7. A highway tunnel trench cover plate cast-in-situ movable formwork according to claim 2, characterized in that: The frame (24) has an assembly hole (241) on its side, and a lifting ring (242) can be detachably installed in the assembly hole (241).

8. A highway tunnel trench cover plate cast-in-situ movable formwork according to claim 1, characterized in that: The mobile base (1) includes a base frame (11), wheels (12) and support legs (13). The wheels (12) and support legs (13) are both located on the bottom surface of the base frame (11). The wheels (12) are used to support the base frame (11) on the ground so that the base frame (11) can move on the ground. The height of the support legs (13) is adjustable so that they can support the base frame (12) on the ground and suspend the wheels (12) in the air.

9. A highway tunnel trench cover plate cast-in-situ movable formwork according to claim 8, characterized in that: The traveling wheel (12) is a swivel wheel.

10. A highway tunnel trench cover plate cast-in-situ movable formwork according to claim 8, characterized in that: The support leg (13) is a hydraulic telescopic cylinder.

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