A segmental inverted arch layering pouring formwork device

Abstract

The utility model provides a device for layered pouring formwork of inverted arch, specifically relates to the field of tunnel construction technology to solve the defect that exists when half width formwork is used. The device includes prefabricated arc steel framework, layered pouring adjusting mechanism, the prefabricated arc steel framework is continuous arc structure and is arranged along the arc contour of inverted arch bottom, the inside fixedly fits with smooth panel of prefabricated arc steel framework, the movable side mould of layered pouring adjusting mechanism is connected perpendicularly in the inside of smooth panel, the movable side mould extends horizontally along the length direction of arc contour and is lifted vertically through telescopic part, the outside wall of prefabricated arc steel framework is connected with support structure, and the other end of support structure is fixed in tunnel surrounding rock or base. The device can effectively solve the defect that exists when half width formwork is used.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and more specifically, to a formwork device for layered casting of an invert arch. Background Technology

[0002] Currently, the requirements for tunnel lining in terms of safety, durability, and waterproofing are increasingly stringent, especially regarding the construction quality of the tunnel invert. To meet these requirements, the tunnel invert needs to be continuously poured and constructed in one go. Traditional invert formwork often uses half-width formwork. In invert construction, the tunnel bottom is divided into two halves, left and right, and excavation, support, and concrete pouring are carried out sequentially. One half is constructed first, and after its concrete strength reaches the required level, the other half is constructed, ultimately closing to form a complete invert structure. This method is often used in tunnels with poor geological conditions (such as soft and fractured surrounding rock) to simplify the construction process or reduce interference with operations ahead.

[0003] However, half-width formwork has the following drawbacks when used: First, it is difficult to ensure the curvature of the bottom during construction, resulting in an uneven concrete surface and affecting the construction effect. Second, when the left and right halves are poured in stages, cold joints or interfaces are easily formed between the old and new concrete, leading to poor bonding and defects such as water seepage or voids. Utility Model Content

[0004] The purpose of this invention is to provide a formwork device for layered casting of inverted arches, which can effectively solve the above-mentioned technical problems.

[0005] The embodiments of this utility model are achieved through the following technical solutions:

[0006] A layered casting template device for an invert arch includes a prefabricated arc-shaped steel frame and a layered casting adjustment mechanism. The prefabricated arc-shaped steel frame has a continuous arc structure and is arranged along the arc contour of the bottom of the invert arch. A smooth panel is fixedly attached to the inner side of the prefabricated arc-shaped steel frame. The movable side mold of the layered casting adjustment mechanism is vertically connected to the inner side of the smooth panel. The movable side mold extends horizontally along the length direction of the arc contour and is vertically raised and lowered by a telescopic component. A support structure is connected to the outer wall of the prefabricated arc-shaped steel frame, and the other end of the support structure is fixed to the surrounding rock or foundation of the tunnel.

[0007] In some embodiments, the prefabricated arc-shaped steel frame is formed by bending I-beams according to the arch design curvature, and the edge of the smooth panel is fully welded to the inner wall of the prefabricated arc-shaped steel frame, with the joint filled with sealant.

[0008] In some embodiments, the outer side wall of the prefabricated arc-shaped steel frame is vertically connected to a curvature calibration component, the other end of which abuts against the surface of the tunnel surrounding rock or temporary support; the curvature calibration component is an adjustable jacking bolt, the end of which is hinged to the outer side wall of the prefabricated arc-shaped steel frame.

[0009] In some embodiments, the layered pouring adjustment mechanism further includes a layered height controller, which is fixed to the surface of the smooth panel; the movable side mold is hinged to the top edge of the precast arc-shaped steel frame through the telescopic member, one end of the telescopic member is connected to the upper part of the outer side wall of the precast arc-shaped steel frame, and the other end is obliquely connected to the outer side wall of the movable side mold.

[0010] In some embodiments, the layer height controller is a graduated ruler that is vertically attached to the surface of a smooth panel; the telescopic component is a hydraulic cylinder, with its cylinder end hinged to the outer wall of the prefabricated arc-shaped steel frame and its piston rod end hinged to the outer wall of the movable side mold.

[0011] In some embodiments, a sealing assembly is provided at the contact interface between the bottom of the movable side formwork and the concrete; the sealing assembly includes a water-swellable rubber strip, which is continuously pasted along the bottom edge of the movable side formwork.

[0012] In some embodiments, the support structure includes a bottom support, which is a spiral lifting adjustable outrigger, the top of which is vertically welded to the bottom edge of a prefabricated arc-shaped steel frame, and the bottom is fixed to the tunnel foundation anchor rod by bolts.

[0013] In some embodiments, a vibration auxiliary mechanism is further included, wherein the attached vibrator of the vibration auxiliary mechanism is fixed to the outer side wall of the prefabricated arc-shaped steel frame, and the vibration auxiliary mechanism further includes a vibration window that is opened through the smooth panel and is provided with a closable cover.

[0014] In some embodiments, the bottom of the smooth panel is horizontally extended along the length direction and welded with an inverted trapezoidal shear cavity, the bottom of which is welded to the web of a prefabricated arc-shaped steel frame.

[0015] In some embodiments, the movable side mold has a roller on the side near the smooth panel, and the roller abuts against the smooth panel.

[0016] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0017] 1. This device relies on the overall arc structure of a prefabricated arc-shaped steel frame (using I-beams bent to the designed arc) to form a continuous, unsegmented arc reference, fundamentally avoiding the curvature discontinuity problem caused by traditional half-width formwork segmented construction. The curvature of the frame is precisely adjusted through curvature calibration components, and a stabilizing system composed of spiral lifting adjustable legs counteracts deformation during construction, ensuring that the smoothness of the concrete surface at the bottom of the invert arch meets design requirements.

[0018] 2. This device dynamically adjusts the height of the movable side formwork via telescopic components, completing the preparation for pouring the second layer before the initial setting of the first layer of concrete, avoiding interface disturbances inherent in traditional multi-stage construction. The water-swellable rubber strip at the bottom of the movable side formwork creates a sealed boundary, preventing grout leakage and cold joints. Simultaneously, the inverted trapezoidal shear cavity at the bottom of the smooth panel is embedded in the concrete, forming a physical interlocking structure between the old and new concrete. The vibration auxiliary mechanism (attached vibrator and vibration window) provides precise vibration at the joint, eliminating voids and promoting interlayer concrete fusion. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An external view of a layered casting template device for an inverted arch provided in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of a layered casting template device for an inverted arch provided in an embodiment of this utility model.

[0022] Icons: 1. Precast curved steel frame; 2. Movable side formwork; 3. Smooth panel; 4. Telescopic component; 5. Curvature calibration component; 6. Scale; 7. Water-swellable rubber strip; 8. Spiral lifting adjustable support leg; 9. Attached vibrator; 10. Vibration window; 11. Closable cover plate; 12. Inverted trapezoidal shear cavity; 13. Roller. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they 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.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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.

[0028] Please see Figures 1-2 As shown, the main body of this embodiment is a layered casting template device for an invert arch, including a prefabricated arc-shaped steel frame 1 and a layered casting adjustment mechanism; the prefabricated arc-shaped steel frame 1 has a continuous arc structure and is arranged along the arc contour of the bottom of the invert arch, and a smooth panel 3 is fixedly attached to the inner side of the prefabricated arc-shaped steel frame 1; the movable side mold 2 of the layered casting adjustment mechanism is vertically connected to the inner side of the smooth panel 3, the movable side mold 2 extends horizontally along the length direction of the arc contour and is vertically raised and lowered by a telescopic component 4; the outer wall of the prefabricated arc-shaped steel frame 1 is connected to a [missing information], and the other end is fixed to the tunnel surrounding rock or foundation.

[0029] Furthermore, the prefabricated arc-shaped steel frame 1 is formed by bending I-beams according to the arch design curvature, and the edge of the smooth panel 3 is fully welded to the inner wall of the prefabricated arc-shaped steel frame 1, with the joint filled with sealant.

[0030] Furthermore, the outer side wall of the prefabricated arc-shaped steel frame 1 is vertically connected to a curvature calibration component 5, the other end of which abuts against the surface of the tunnel surrounding rock or temporary support; the curvature calibration component 5 is an adjustable jacking bolt, the end of which is hinged to the outer side wall of the prefabricated arc-shaped steel frame 1.

[0031] Furthermore, the layered pouring adjustment mechanism also includes a layered height controller, which is fixed to the surface of the smooth panel 3; the movable side mold 2 is hinged to the top edge of the precast arc-shaped steel frame 1 through the telescopic member 4, one end of the telescopic member 4 is connected to the upper part of the outer side wall of the precast arc-shaped steel frame 1, and the other end is obliquely connected to the outer side wall of the movable side mold 2.

[0032] Furthermore, the layer height controller is a scale 6 with graduations, which is vertically attached to the surface of the smooth panel 3; the telescopic component 4 is a hydraulic cylinder, the end of which is hinged to the outer wall of the prefabricated arc-shaped steel frame 1, and the end of the piston rod is hinged to the outer wall of the movable side mold 2.

[0033] Furthermore, a sealing component is provided at the contact interface between the bottom of the movable side mold 2 and the concrete; the sealing component includes a water-swellable rubber strip 7, which is continuously pasted along the bottom edge of the movable side mold 2.

[0034] Furthermore, the system includes a bottom support, which is a spiral lifting adjustable outrigger 8. Its top is vertically welded to the bottom edge of the prefabricated arc-shaped steel frame 1, and its bottom is fixed to the tunnel foundation anchor rod by bolts.

[0035] Furthermore, it also includes a vibration auxiliary mechanism, wherein the attached vibrator 9 of the vibration auxiliary mechanism is fixed to the outer side wall of the prefabricated arc-shaped steel frame 1, and the vibration auxiliary mechanism also includes a vibration window 10, which is opened through the smooth panel 3, and the vibration window 10 is provided with a closable cover plate 11.

[0036] Furthermore, an inverted trapezoidal shear cavity 12 is welded to the bottom of the smooth panel 3 along its length direction, and the bottom of the shear cavity is welded to the web of the prefabricated arc-shaped steel frame.

[0037] Furthermore, the movable side mold 2 is provided with a roller 13 on the side near the smooth panel 3, and the roller 13 abuts against the smooth panel 3.

[0038] In operation, this device first involves continuously splicing the prefabricated arc-shaped steel frame 1 along the arc-shaped contour of the bottom of the invert arch. The overall structure, formed by bending I-beams according to the designed curvature, ensures precise curvature, which is further adjusted using curvature calibration components 5. The smooth panel 3 is then attached and fixed to the inner side of the prefabricated arc-shaped steel frame 1, with sealant filling the joints. An inverted trapezoidal shear cavity 12 is welded to the bottom of the smooth panel 3, ensuring a secure connection between its bottom and the web of the prefabricated arc-shaped steel frame 1. During installation, the bottom is fixed to the tunnel foundation anchor bolts using spiral lifting adjustable outriggers 8. Laterally, temporary support for the tunnel sidewalls can be connected via diagonal steel braces, forming a stable support system.

[0039] Subsequently, the layered pouring adjustment mechanism is operated, and the movable side formwork 2 is driven vertically downward through the telescopic component 4. Adjusted to the first layer pouring height with reference to the scale 6, the movable side formwork 2 is made to vertically fit the inner side of the smooth panel 3 and extend along the arc contour. The water-swellable rubber strip 7 at the bottom of the movable side formwork 2 contacts the base to form a seal. The first layer of concrete is poured into the enclosed space, and the attached vibrator 9 is activated to compact it. For dead corners around the inverted trapezoidal shear cavity 12, a vibrator is inserted through the vibration window 10 to assist in vibration. After completion, the closable cover plate 11 is closed. It is worth mentioning that the inverted trapezoidal shear cavity 12 allows for an additional trapezoidal block on the outer side after the invert arch is poured, facilitating the overlap of the later-poured body, further reducing the degree of poor bonding between the old and new concrete, and reducing the risk of leakage.

[0040] Then, before the first layer of concrete initially sets, the movable side formwork 2 is driven vertically upwards to the height of the second layer via the expansion joint 4. The water-swellable rubber strip 7 at the bottom of the movable side formwork 2 is sealed and adhered to the surface of the first layer of concrete, and the rollers 13 reduce the friction during lifting and lowering to ensure stability. Concrete is continuously poured into the second layer space, and the bonding area between the new and old concrete is focused on by the attached vibrator 9 and the vibration window 10, so that the inverted trapezoidal shear cavity 12 is embedded into the second layer of concrete to form a physical interlock, promoting interlayer fusion. After pouring, it is covered and cured, and stability is maintained during the curing period.

[0041] After the concrete reaches the required strength, the movable side formwork 2 is lowered to its initial position using the expansion joint 4. Sealing components such as the water-swellable rubber strip 7 are removed, and the attached vibrator 9 and the closable cover 11 of the vibration window 10 are unloaded. Then, the lateral supports and the spiral-lift adjustable outriggers 8 are removed in sequence. The splicing bolts of the precast curved steel frame 1 are loosened, and the precast curved steel frame 1 is lifted off the smooth panel 3 in sections. After cleaning, it is transferred to the next construction section.

[0042] This device relies on the overall arc-shaped structure of the prefabricated arc-shaped steel frame 1 (made by bending I-beams according to the design arc) to form a continuous, unsegmented arc-shaped reference, fundamentally avoiding the curvature discontinuity problem caused by traditional half-width formwork segmented construction. The curvature of the frame is precisely adjusted by the curvature calibration component 5, and the stabilizing system formed by the spiral lifting adjustable support legs 8 counteracts deformation during construction, ensuring that the smoothness of the concrete surface at the bottom of the invert arch meets the design requirements.

[0043] This device uses the telescopic component 4 to drive the movable side formwork 2 to dynamically adjust its height, completing the preparation for pouring the second layer of concrete before the first layer of concrete has initially set, thus avoiding interface disturbances in traditional multi-stage construction. The water-swellable rubber strip 7 at the bottom of the movable side formwork 2 forms a sealed boundary, preventing grout leakage and cold joints. At the same time, the inverted trapezoidal shear cavity 12 at the bottom of the smooth panel 3 is embedded in the concrete, forming a physical interlocking structure between the old and new concrete. The vibration auxiliary mechanism (attached vibrator 9 and vibration window 10) provides precise vibration at the joint, eliminating voids and promoting the fusion of interlayer concrete.

[0044] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A formwork device for layered casting of an inverted arch, characterized in that, It includes a prefabricated arc-shaped steel frame (1) and a layered casting adjustment mechanism; the prefabricated arc-shaped steel frame (1) has a continuous arc structure and is arranged along the arc contour of the bottom of the inverted arch, and a smooth panel (3) is fixedly attached to the inner side of the prefabricated arc-shaped steel frame (1); the movable side mold (2) of the layered casting adjustment mechanism is vertically connected to the inner side of the smooth panel (3), the movable side mold (2) extends horizontally along the length direction of the arc contour and is vertically raised and lowered by a telescopic component (4); the outer side wall of the prefabricated arc-shaped steel frame (1) is connected to a support structure, and the other end of the support structure is fixed to the surrounding rock or foundation of the tunnel.

2. The invert arch layered casting formwork device according to claim 1, characterized in that, The prefabricated arc-shaped steel frame (1) is formed by bending I-beams according to the arch design. The edge of the smooth panel (3) is fully welded to the inner wall of the prefabricated arc-shaped steel frame (1), and the joint is filled with sealant.

3. The invert arch layered casting formwork device according to claim 2, characterized in that, The outer side wall of the prefabricated arc-shaped steel frame (1) is vertically connected to a curvature calibration component (5), and the other end of the curvature calibration component (5) abuts against the surface of the tunnel surrounding rock or temporary support; the curvature calibration component (5) is an adjustable jacking bolt, and its screw end is hinged to the outer side wall of the prefabricated arc-shaped steel frame (1).

4. The invert arch layered casting formwork device according to claim 1, characterized in that, The layered pouring adjustment mechanism also includes a layered height controller, which is fixed to the surface of the smooth panel (3); the movable side mold (2) is hinged to the top edge of the precast arc steel frame (1) through the telescopic member (4), one end of the telescopic member (4) is connected to the upper part of the outer side wall of the precast arc steel frame (1), and the other end is obliquely connected to the outer side wall of the movable side mold (2).

5. The invert arch layered casting formwork device according to claim 4, characterized in that, The layer height controller is a scale (6) with graduations, which is vertically pasted on the surface of the smooth panel (3); the telescopic component (4) is a hydraulic cylinder, the end of which is hinged to the outer wall of the prefabricated arc-shaped steel frame (1), and the end of the piston rod is hinged to the outer wall of the movable side mold (2).

6. The invert arch layered casting formwork device according to claim 1, characterized in that, The bottom of the movable side formwork (2) is sealed to the interface between the concrete and the concrete with a sealing component; the sealing component includes a water-swellable rubber strip (7), which is continuously pasted along the bottom edge of the movable side formwork (2).

7. The invert arch layered casting formwork device according to claim 1, characterized in that, The support structure includes a bottom support, which is a spiral lifting adjustable outrigger (8), the top of which is vertically welded to the bottom edge of the prefabricated arc-shaped steel frame (1), and the bottom is fixed to the tunnel foundation anchor rod by bolts.

8. The invert arch layered casting formwork device according to claim 1, characterized in that, It also includes a vibration auxiliary mechanism, wherein the attached vibrator (9) of the vibration auxiliary mechanism is fixed to the outer side wall of the precast arc-shaped steel frame (1), and the vibration auxiliary mechanism also includes a vibration window (10), which is opened through the smooth panel (3), and the vibration window (10) is provided with a closable cover plate (11).

9. The invert arch layered casting formwork device according to claim 1, characterized in that, The bottom of the smooth panel (3) is horizontally extended along the length direction and welded with an inverted trapezoidal anti-shear cavity (12), the bottom of which is welded to the web of the prefabricated arc-shaped steel frame.

10. The invert arch layered casting formwork device according to claim 1, characterized in that, The movable side mold (2) has a roller (13) on the side near the smooth panel (3), and the roller (13) abuts against the smooth panel (3).

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