A rapid construction method using a self-propelled inverted arch trestle

Abstract

The present application discloses a rapid construction method using a self-propelled inverted arch trestle. When constructing and pouring an inverted arch concrete layer, a flexible cover plate is pulled out by a pulling assembly arranged on an inverted arch formwork system so that the flexible cover plate covers the top surface of the inverted arch, and then concrete is poured into a space surrounded by the flexible cover plate and the inverted arch formwork system through pouring holes on the flexible cover plate; the curvature of the top surface of the formed inverted arch concrete layer meets the design requirements; then a filling concrete layer is poured, and after the inverted arch concrete is formed, the flexible cover plate is rolled up by a rolling assembly arranged on the inverted arch formwork to realize automatic demoulding, which significantly improves the construction efficiency, and then concrete is poured until the concrete reaches the designed elevation; finally, concrete curing is performed to complete the construction of a section of the inverted arch structure.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel construction, and in particular to a rapid construction method using a self-propelled inverted trestle. Background Art

[0002] In tunnel construction projects, the construction of secondary lining inverts is a key link in tunnel construction progress control. After the invert construction is completed, it represents the initial ring formation of the tunnel, which plays a very critical role in controlling the initial support deformation of the tunnel and ensuring the safety of tunnel construction.

[0003] The current invert construction process is generally: tunnel bottom excavation and slag removal, invert reinforcement binding, invert trestle driving the invert formwork system to move to the construction position, installing water stop and end-capping formwork, pouring concrete, concrete curing, etc. Since the invert and the filling are two different structures, they are often designed as different grade concretes, so they need to be poured twice in the process of pouring concrete. However, the existing invert formwork is difficult to ensure the curvature of the invert top surface during the invert structure concrete pouring process, and before pouring the filling structure concrete, the lower formwork needs to be removed before it can be carried out, which greatly increases the construction time. Therefore, it is necessary to improve this. Summary of the invention

[0004] In order to solve the above-mentioned technical problems, the present application provides a rapid construction method using a self-propelled inverted arch trestle.

[0005] The present application provides a method for rapid construction of a self-propelled inverted trestle using the following technical solution:

[0006] A rapid construction method using a self-propelled inverted trestle comprises the following steps:

[0007] S1. Excavate the tunnel bottom and remove the slag;

[0008] S2. Lay low side wall waterproofing boards and longitudinal blind pipes;

[0009] S3, binding of invert reinforcement;

[0010] S4, the inverted arch trestle drives the inverted arch formwork system to move forward to the construction position, and then installs the water stop and end-sealing formwork;

[0011] S5, pouring the inverted arch concrete layer: using the pull-out assembly arranged on the inverted arch formwork system to pull out the flexible cover plate so that the flexible cover plate covers the top surface of the inverted arch, and then pouring concrete into the space enclosed by the flexible cover plate and the inverted arch formwork system through the pouring holes on the flexible cover plate;

[0012] S6, pouring filling concrete layer: after the inverted arch concrete is formed, the flexible cover plate is rolled up by the rolling assembly arranged on the inverted arch formwork, and then the concrete is poured until the design elevation is reached;

[0013] S7, concrete curing;

[0014] S8. Repeat steps S1 to S7 until the invert construction is completed.

[0015] By adopting the above technical solution, when pouring the inverted arch concrete, the flexible cover plate is pulled out by the pull-out assembly. When the flexible cover plate is spread in place, the concrete is poured through the pouring hole by a concrete pump truck. Since the flexible cover plate is flexible, it is easy to adjust the shape of the flexible cover plate so that the curvature of the flexible cover plate matches the curvature of the top surface of the inverted arch, so that the curvature of the top surface of the formed inverted arch concrete meets the design requirements, which is conducive to improving the force performance. After the inverted arch concrete layer is formed, the flexible cover plate is rolled up by the winding assembly to realize the automatic disassembly of the flexible cover plate without manual disassembly, so as to facilitate the subsequent pouring of the filling concrete layer, which significantly improves the construction efficiency.

[0016] Preferably, the inverted arch formwork system includes two groups of side form units and an arc-shaped steel frame arranged between the two groups of side form units, the curvature of the arc-shaped steel frame matches the designed curvature of the top surface of the inverted arch, and the flexible sealing plate is arranged on the lower surface of the arc-shaped steel frame.

[0017] By adopting the above technical scheme, on the one hand, the arc-shaped steel frame plays a shaping role on the flexible covering plate, so that the flexible covering plate conforms to the designed curvature of the top surface of the invert arch after being spread out; on the other hand, the arc-shaped steel frame plays a supporting role on the flexible covering plate, so that the flexible covering plate will not be deformed during the pouring of concrete, which is beneficial to ensure the molding quality of the concrete layer of the invert arch.

[0018] Preferably, the winding assembly is arranged at one end of the arc-shaped steel frame close to one of the side mold units, and the winding assembly includes a winding shaft arranged on the upper surface of the arc-shaped steel frame, one end of the flexible sealing plate is fixed on the winding shaft, and the other end of the flexible sealing plate penetrates the arc-shaped steel frame from the upper surface to the lower surface of the arc-shaped steel frame and is fixedly connected with two flexible belts, and the flexible belts penetrate the arc-shaped steel frame from the lower surface to the upper surface of the arc-shaped steel frame and are connected to the pulling assembly.

[0019] By adopting the above technical solution, the pull-out assembly can pull out the flexible cover plate by pulling out the flexible belt so as to pour the inverted arch concrete layer. When the inverted arch concrete layer is constructed, the reel can rotate to retract the flexible cover plate so as to pour the filling concrete layer.

[0020] Preferably, the pulling assembly is located on the opposite side of the arc-shaped steel frame where the winding assembly is provided, and the pulling assembly includes a rotating shaft installed on the upper surface of the arc-shaped steel frame, and one end of the flexible belt away from the flexible sealing plate is wound around the rotating shaft.

[0021] By adopting the above technical solution, the rotating shaft rotates to reel in the flexible belt, thereby pulling out the flexible sealing plate.

[0022] Preferably, the side mold unit is provided with a lifting member for driving the arc-shaped steel frame to move in the vertical direction.

[0023] By adopting the above technical solution, after the construction of the inverted arch concrete layer is completed, the arc-shaped steel frame is driven upward by the jacking member, thereby facilitating the demoulding of the flexible sealing plate and the subsequent pouring of the filling concrete layer.

[0024] Preferably, the arc-shaped steel frame includes two groups of steel frame components, the steel frame components include a first steel frame connected to the side mold unit, a second steel frame is hingedly connected to a side of the first steel frame away from the side mold unit, and the first steel frame is provided with a flip cylinder for driving the second steel frame to rotate.

[0025] By adopting the above technical solution, since the surface of the filling layer needs to be leveled, in order to facilitate construction, before pouring the filling concrete layer, the two second steel frames are driven by a flip cylinder to rotate in a direction away from the inverted arch concrete layer, thereby opening the arc steel frame to pour the filling concrete layer and level it.

[0026] Preferably, when the flexible sealing plate is unfolded, overflow holes are provided at the four corners of the flexible sealing plate close to the side mold unit.

[0027] By adopting the above technical solution, it is convenient to judge whether the amount of poured inverted arch concrete is sufficient, thereby ensuring the construction quality of the inverted arch concrete layer.

[0028] Preferably, the flexible sealing plate is configured as an airbag.

[0029] By adopting the above technical solution, by using the airbag as the flexible sealing plate, when pouring the inverted arch concrete layer, the flexible sealing plate is first inflated to expand it, so that the flexible sealing plate can be sealed at the corners so that the flexible sealing plate itself has a strong strength, so that the arc surface of the formed inverted arch concrete layer is smoother, which is conducive to improving the forming quality. After the inverted arch concrete layer is formed, the flexible sealing plate is deflated, and the arc-shaped steel frame is lifted in conjunction with the lifting piece, which is conducive to the demoulding of the flexible sealing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of the invert construction in this application;

[0031] Figure 2 It is a schematic diagram of the overall structure of the inverted arch formwork system in this application;

[0032] Figure 3 Schematic diagram of the structure after the flexible sealing plate is unfolded in this application;

[0033] Figure 4 It is a schematic diagram of the structure of the winding assembly after the flexible sealing plate is retracted in the present application.

[0034] Description of reference numerals:

[0035] 1. Side mold unit; 2. Arc steel frame; 21. First steel frame; 22. Second steel frame; 23. Flip cylinder; 3. Flexible sealing plate; 4. Winding assembly; 41. Winding shaft; 42. First motor; 5. Pulling assembly; 51. Rotating shaft; 52. Second motor; 6. Flexible belt; 7. Casting hole; 8. Overflow hole; 9. Lifting cylinder; 10. Connecting plate. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-4 This application is described in further detail.

[0037] The present application embodiment discloses a method for rapid construction of a self-propelled inverted trestle. Figure 1 , including the following steps:

[0038] S1. Use an excavator and a dump truck to excavate the tunnel bottom and remove the slag. This process can be completed during the face drilling time and will not affect the face construction.

[0039] S2. Lay the waterproof board and longitudinal blind pipe of the low side wall. Specifically: The longitudinal blind pipe is wrapped with geotextile and waterproof board according to the design and fixed on the shotcrete primary support surface at the bottom of the side wall. The exposed overlap of the waterproof board at the construction joint is not less than 1m. The waterproof board is double-welded strictly according to the design requirements. It should be laid closely to the primary support surface and the top should be neat. Circumferential drainage board should be laid at the seepage and dripping parts. Pressure relief drainage pipes should be added in the groundwater development section of the invert.

[0040] S3. Binding of invert reinforcement.

[0041] S4. The inverted arch trestle drives the inverted arch formwork system to move forward to the construction position, and then installs the waterstop and end-sealing formwork. Since the inverted arch construction joint is designed with a buried waterstop, a back-sticking waterstop is provided at the bottom. The end formwork is designed in blocks according to the position of the buried waterstop. The upper part is a fixed steel formwork. Due to the influence of the initial support and irregular excavation of the inverted arch, the lower part is designed as a steel formwork clamped by a wooden formwork to adapt to the linear changes of the inverted arch bottom, so as to achieve a tight end sealing without leakage. Before laying the back-sticking waterstop at the bottom of the construction joint, the base surface should be cleaned and leveled with mortar to ensure that the back-sticking waterstop does not fall off.

[0042] S5. Casting of invert concrete layer: refer to Figure 2 and Figure 3 The flexible cover plate 3 is pulled out by using the pulling assembly 5 arranged on the inverted arch formwork system so that the flexible cover plate 3 covers the top surface of the inverted arch, and then concrete is poured into the space enclosed by the flexible cover plate 3 and the inverted arch formwork system through the pouring holes 7 on the flexible cover plate 3.

[0043] S6, pouring filling concrete layer: after the inverted arch concrete is formed, the flexible cover plate 3 is rolled up by the rolling assembly 4 arranged on the inverted arch formwork, and then the concrete is poured until the designed elevation is reached.

[0044] Reference Figure 2 The inverted arch formwork system includes two groups of side formwork units 1 and an arc-shaped steel frame 2 arranged between the two groups of side formwork units 1. The curvature of the arc-shaped steel frame 2 matches the designed curvature of the top surface of the inverted arch. The arc-shaped steel frame 2 can be opened and closed. The side formwork unit 1 is provided with a lifting member for lifting the arc-shaped steel frame 2. The pulling assembly 5 and the winding assembly 4 are both located on the upper surface of the arc-shaped steel frame 2. The pulling assembly 5 is arranged on one side of the arc-shaped steel frame 2 close to one group of side formwork units 1, and the winding assembly 4 is arranged on the side of the arc-shaped steel frame 2 close to the other group of side formwork units 1. The flexible sealing plate 3 is arranged on the lower surface of the arc-shaped steel frame 2, and the flexible sealing plate 3 is configured as an airbag. One end of the flexible sealing plate 3 penetrates the arc-shaped steel frame 2 from the lower surface to the upper surface of the arc-shaped steel frame 2 and is connected to the winding component 4; the other end of the flexible sealing plate 3 is connected to two flexible belts 6, and the two flexible belts 6 are respectively located on both sides of the length direction of the flexible sealing plate 3. The flexible belts 6 penetrate the arc-shaped steel frame 2 from the lower surface to the upper surface of the arc-shaped steel frame 2 and are connected to the pulling component 5.

[0045] Reference Figure 2 and Figure 3 When pouring the inverted arch concrete layer, the arc steel frame 2 is closed, and the flexible cover plate 3 is pulled out from the winding assembly 4 by the pulling assembly 5 until the flexible cover plate 3 is stuck and cannot move anymore, and then the flexible cover plate 3 is inflated. The arc steel frame 2 plays a shaping role on the flexible cover plate 3, so that the arc surface of the flexible cover plate 3 after opening matches the designed arc surface of the inverted arch. A casting hole 7 and four overflow holes 8 are left on the flexible cover plate 3. When the flexible cover plate 3 is unfolded, the projection of the casting hole 7 on the horizontal plane is located in the middle of the inverted arch, and the four overflow holes 8 are respectively located at the four corners of the flexible cover plate 3 close to the side mold unit 1. The inverted arch concrete is poured through the casting hole 7. During the pouring process, if concrete is found to gush out of the overflow hole 8, it means that the pouring of the inverted arch concrete is completed. When the inverted arch concrete is formed, the flexible cover plate 3 is deflated, and then the arc steel frame 2 is pushed up by the lifting piece to facilitate the demoulding of the flexible cover plate 3.

[0046] Reference Figure 4 Then, pour the inverted arch concrete. Use the winding assembly 4 to retract the flexible cover plate 3, then open the arc steel frame 2, and use the concrete pump truck to pour concrete from the opening of the arc steel frame 2. During this process, vibrate the corners. When the concrete is poured to the designed elevation, it is leveled, and the construction of a section of the inverted arch structure is completed.

[0047] Reference Figure 2Specifically, the arc-shaped steel frame 2 includes two groups of steel frame components, each group of steel frame components includes a first steel frame 21 connected to the side form unit 1, and a second steel frame 22 is hingedly connected to the side of the first steel frame 21 away from the side form unit 1. A fracture is provided on the side of the second steel frame 22 away from the first steel frame 21. When the two second steel frames 22 are closed, the two fractures are directly opposite to the pouring hole 7, so as to pour the inverted arch concrete. A flip cylinder 23 is provided on the first steel frame 21 to drive the second steel frame 22 to rotate. The cylinder body of the flip cylinder 23 is hinged to the upper surface of the first steel frame 21, and the piston rod of the flip cylinder 23 is hinged to the upper surface of the second steel frame 22. When pouring the filling concrete layer, the second steel frame 22 is opened by using the flip cylinder 23, so as to facilitate the pouring of the filling concrete layer and leveling of the filling concrete layer.

[0048] Reference Figure 2 The winding assembly 4 is arranged on the upper surface of one of the first steel frames 21, and the winding assembly 4 is located near the side mold unit 1. The winding assembly 4 includes a winding shaft 41 arranged on the upper surface of the arc-shaped steel frame 2 and a first driving member driving the winding shaft 41 to rotate. The first driving member is a first motor 42, and the output shaft of the first motor 42 is fixedly connected to the winding shaft 41, and the flexible sealing plate 3 is wound on the winding shaft 41.

[0049] Reference Figure 2 The pull-out assembly 5 is arranged on the upper surface of another first steel frame 21, and the pull-out assembly 5 is located near the side mold unit 1. The pull-out assembly 5 includes a rotating shaft 51 arranged on the upper surface of the first steel frame 21 and a second driving member driving the rotating shaft 51 to rotate. The second driving member is a second motor 52, and the output shaft of the second motor 52 is fixedly connected to the rotating shaft 51. The axis of the rotating shaft 51 is parallel to the winding shaft 41, and the flexible belt 6 is wound on the rotating shaft 51.

[0050] When the flexible cover plate 3 needs to be pulled out, the first motor 42 drives the reel 41 to rotate to loosen the flexible cover plate 3, and the second motor 52 drives the rotating shaft 51 to rotate to reel in the flexible belt 6. When the end of the flexible cover plate 3 away from the reel 41 abuts against the lower surface of the arc-shaped steel frame 2, the flexible cover plate 3 stops moving, and the flexible cover plate 3 is spread out. Similarly, the process of retracting the flexible cover plate 3 is similar, which will not be described in detail here.

[0051] Reference Figure 2 The lifting part is a lifting cylinder 9. The upper surface of the side mold unit 1 is recessed with a groove for preventing the lifting cylinder 9. The lifting cylinder 9 is placed in the groove. The upper surface of the first steel frame 21 is fixedly connected with a connecting plate 10. The piston rod of the lifting cylinder 9 is fixedly connected to the connecting plate 10. When the inverted arch concrete is poured, the lifting cylinder 9 pushes up the arc-shaped steel frame 2, so as to facilitate the demoulding of the flexible sealing plate 3.

[0052] S7. Concrete curing.

[0053] S8. Repeat steps S1 to S7 until the invert construction is completed.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rapid construction method using a self-propelled inverted trestle, characterized in that: The following steps are involved: S1. Excavate the tunnel bottom and remove the slag; S2. Lay low side wall waterproofing boards and longitudinal blind pipes; S3, binding of invert reinforcement; S4, the inverted arch trestle drives the inverted arch formwork system to move forward to the construction position, and then installs the water stop and end-sealing formwork; S5, pouring the inverted arch concrete layer: using the pulling assembly (5) arranged on the inverted arch formwork system to pull out the flexible cover plate (3) so that the flexible cover plate (3) covers the top surface of the inverted arch, and then pouring concrete into the space enclosed by the flexible cover plate (3) and the inverted arch formwork system through the pouring holes (7) on the flexible cover plate (3); S6, pouring the filling concrete layer: after the inverted arch concrete is formed, the flexible cover plate (3) is rolled up by a rolling assembly (4) arranged on the inverted arch formwork, and then the concrete is poured until the designed elevation is reached; S7, concrete curing; S8, repeating steps S1 to S7 until the invert construction is completed; The inverted arch formwork system comprises two groups of side formwork units (1) and an arc-shaped steel frame (2) arranged between the two groups of side formwork units (1), the curvature of the arc-shaped steel frame (2) matches the designed curvature of the top surface of the inverted arch, and the flexible sealing plate (3) is arranged on the lower surface of the arc-shaped steel frame (2); The winding assembly (4) is arranged at one end of the arc-shaped steel frame (2) close to one of the side mold units (1), and the winding assembly (4) includes a winding shaft (41) arranged on the upper surface of the arc-shaped steel frame (2), one end of the flexible sealing plate (3) is fixed on the winding shaft (41), and the other end of the flexible sealing plate (3) penetrates the arc-shaped steel frame (2) from the upper surface to the lower surface of the arc-shaped steel frame (2) and is fixedly connected with two flexible belts (6), and the flexible belts (6) penetrate the arc-shaped steel frame (2) from the lower surface to the upper surface of the arc-shaped steel frame (2) and are connected to the pulling assembly (5); The pulling assembly (5) is located on the opposite side of the arc-shaped steel frame (2) where the winding assembly (4) is provided. The pulling assembly (5) comprises a rotating shaft (51) installed on the upper surface of the arc-shaped steel frame (2), and one end of the flexible belt (6) away from the flexible sealing plate (3) is wound around the rotating shaft (51).

2. A rapid construction method using a self-propelled inverted trestle according to claim 1, characterized in that: The side mold unit (1) is provided with a lifting member for driving the arc-shaped steel frame (2) to move in a vertical direction.

3. The rapid construction method using a self-propelled inverted trestle according to claim 1, characterized in that: The arc-shaped steel frame (2) comprises two groups of steel frame components, wherein the steel frame components comprise a first steel frame (21) connected to the side mold unit (1), a second steel frame (22) being hingedly connected to a side of the first steel frame (21) away from the side mold unit (1), and a turning cylinder (23) for driving the second steel frame (22) to rotate is arranged on the first steel frame (21).

4. The rapid construction method using a self-propelled inverted trestle according to claim 1, characterized in that: When the flexible sealing plate (3) is unfolded, overflow holes (8) are provided at the four corners of the flexible sealing plate (3) close to the side mold unit (1).

5. The rapid construction method using a self-propelled inverted trestle according to claim 1, characterized in that: The flexible sealing plate (3) is configured as an air bag.

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