Construction method of a combined type needle beam steel mold trolley with a flat hole bottom arch and a circumferential slip form

Abstract

The present application relates to a kind of construction methods of flat hole bottom arch circumferential slipform composite needle beam steel mould trolley, belong to the technical field of tunnel lining construction.The top of the trolley frame and both sides are matched with tunnel inner wall, and side top arch profiled steel mould is arranged by telescopic support support, the bottom of the trolley frame is symmetrically installed with bottom arch profiled steel mould by bottom arch slipform sliding positioning device, and arch slipform sliding positioning device is arc block same with the arc of the bottom arch of tunnel, bottom arch profiled steel mould is slidably installed on arch slipform sliding positioning device by telescopic support, and the support telescopic support of side top arch profiled steel mould and the support telescopic support of bottom arch profiled steel mould are connected by bottom arch slipform inclined bracing hydraulic oil cylinder, and both ends of bottom arch slipform inclined bracing hydraulic oil cylinder are respectively hinged with telescopic support.The present application can guarantee concrete construction quality, simultaneously, anchor groove formwork is removed in time during concrete curing, and the appearance quality of reserved groove is guaranteed and the turnover utilization rate of anchor groove formwork is improved.

Description

Technical Field

[0001] This invention belongs to the field of tunnel lining construction technology, specifically, it relates to a construction method for a composite needle beam steel formwork trolley with circumferential slipform for the bottom arch of a flat tunnel. Background Technology

[0002] With the country increasing its investment in infrastructure, in addition to the large-scale construction of tunnels for high-speed railways and highways, more deep and long-distance water conveyance and diversion tunnels are being widely used. The construction of tunnels for other purposes is also gradually increasing. The requirements for tunnel lining are also higher than those for conventional tunnels. Steel formwork trolleys used for concrete lining construction of the inner wall of tunnels are an indispensable non-standard product for secondary lining in the tunnel construction process.

[0003] Traditionally used needle beam steel formwork trolleys include bottom formwork needle beam type, side-top arch needle beam type, and full-circle needle beam type. Conventional needle beam steel formwork trolleys are used for simple lining structures. However, tunnel lining structures used for different purposes are now more complex and diverse, such as prestressed lining structures, where anchor grooves and other structures are pre-reserved in the lining. Therefore, conventional needle beam steel formwork trolleys have obvious limitations. The formwork treatment at the reserved groove positions is more complicated. At the same time, the post-concrete surface quality defects after demolding of conventional steel formwork trolleys require a lot of manpower and resources for treatment, making it difficult to guarantee the quality of concrete construction. The turnover rate of anchor groove formwork is low, resulting in unnecessary waste.

[0004] Therefore, it is necessary to provide a construction method for a composite needle beam steel formwork trolley with circumferential slipform for the bottom arch of a flat tunnel, to solve the problem of formwork treatment for the reserved groove in the lining, to promptly address surface defects in the bottom arch concrete, and to ensure the quality of concrete construction. Summary of the Invention

[0005] To overcome the problems in the background technology, such as the need for significant manpower and resources to address concrete surface defects after demolding using conventional steel formwork trolleys, the difficulty in ensuring concrete construction quality, and the low turnover rate of anchorage slot formwork leading to unnecessary waste, this invention provides a construction method for a composite needle beam steel formwork trolley with circumferential slipforming for the bottom arch of a flat tunnel. This method solves the problem of handling the formwork for the lining reserved slot, enabling timely treatment of surface defects in the bottom arch concrete, ensuring concrete construction quality, and allowing for timely removal of the anchorage slot formwork during concrete curing, thus ensuring the appearance quality of the reserved slot and improving the turnover rate of the anchorage slot formwork.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention provides a construction method for a composite needle beam steel formwork trolley with circumferential slipform for the bottom arch of a flat tunnel, comprising the following steps: Step 1: Move the composite needle beam steel formwork trolley and slide the bottom arch shaping steel formwork 2 onto the arch sliding formwork sliding positioning device 4 using the telescopic bracket. The bottom arch range is 120° to 130° from the bottom. Pull or push the telescopic bracket with the bottom arch sliding formwork inclined support hydraulic cylinder 5 to move the bottom arch shaping steel formwork 2 on the arch sliding formwork sliding positioning device 4. Then fix the bottom arch shaping steel formwork 2 with the telescopic bracket to complete the lining concrete construction at different positions within the bottom 120° to 130° range. The bottom of the bottom arch can be a horizontal section or a circular arc section structure. The lining concrete construction of both horizontal and circular arc sections can be completed by moving the bottom arch shaping steel formwork 2.

[0007] Step 2: Move the bottom arch shaping steel mold 2 to the reserved anchor groove 6 by sliding the arch sliding positioning device 4. Stretch and fix the telescopic bracket to fix the bottom arch shaping steel mold 2 at the reserved anchor groove 6. Pour the bottom arch concrete of the reserved anchor groove 6 to complete the defect treatment and removal of the anchor groove formwork. After the bottom arch concrete of the reserved anchor groove is poured, move the bottom arch shaping steel mold 2 to both sides in a circumferential direction. Perform manual finishing on the surface of the poured concrete according to the strength requirements.

[0008] Step 3: After the concrete pouring within the bottom arch area is completed, the bottom arch shaping steel mold 2 is rotated by the hydraulic cylinder 5 of the bottom arch sliding formwork inclined support so that the bottom arch shaping steel mold 2 and the side top arch shaping steel mold 3 are connected and fixed by the connecting bolts 7 set at their ends, and the side top arch concrete is poured to complete the concrete placement vibration and layered pouring treatment. Step 4: Demolding the device by moving the composite needle beam steel mold trolley forward, then repairing defects in the completed concrete pouring, and curing the concrete.

[0009] Preferably, the flat tunnel bottom arch circumferential sliding formwork composite needle beam steel formwork trolley includes a trolley frame 1, a bottom arch shaping steel formwork 2, a side arch shaping steel formwork 3, a bottom arch sliding formwork sliding positioning device 4, and a bottom arch sliding formwork inclined support hydraulic cylinder 5. The top and sides of the trolley frame 1 are equipped with side arch shaping steel formwork 3 supported by telescopic brackets to match the tunnel inner wall. The bottom sides of the trolley frame 1 are symmetrically equipped with bottom arch shaping steel formwork 2 via the bottom arch sliding positioning device 4. The bottom arch sliding formwork sliding positioning device 4 is an arc-shaped block with the same curvature as the bottom arch on both sides of the tunnel. The arch-shaped steel mold 2 is slidably installed on the arch sliding mold sliding positioning device 4 via a telescopic bracket. The supporting telescopic brackets of the side top arch-shaped steel mold 3 and the supporting telescopic brackets of the bottom arch-shaped steel mold 2 are connected by the bottom arch sliding mold inclined support hydraulic cylinder 5. The two ends of the bottom arch sliding mold inclined support hydraulic cylinder 5 are respectively hinged to the telescopic bracket, which can simultaneously realize the contraction and movement of the longitudinal side top arch-shaped steel mold 3 and the circumferential bottom arch-shaped steel mold 2, meet the different concrete pouring construction requirements of the bottom arch-shaped steel mold 2 and the side top arch-shaped steel mold 3, and ensure the continuity of the full-section concrete pouring.

[0010] Preferably, the moving trajectory of the bottom arch shaping steel mold 2 covers the location of the reserved anchor groove 6.

[0011] Preferably, the maximum sliding angle of the two bottom arch shaping steel molds 2 on the two arch sliding mold sliding positioning devices 4 on both sides of the bottom of the trolley frame 1 is 120° to 130°.

[0012] Preferably, both the bottom arch shaping steel mold 2 and the side arch shaping steel mold 3 are provided with connecting bolts 7 at their ends, and the bottom arch shaping steel mold 2 and the side arch shaping steel mold 3 are connected by the connecting bolts 7.

[0013] The beneficial effects of this invention are: This invention satisfies the requirements of conventional needle beam steel formwork for longitudinal side arch concrete lining construction, while simultaneously solving the problem of achieving bottom arch concrete lining construction using circumferential slipform in tunnels. It enables the needle beam steel formwork trolley to move longitudinally and circumferentially. The bottom arch circumferential slipform system, composed of the bottom arch shaping steel formwork and the bottom arch slipform sliding positioning device, effectively solves the problem of prestressed anchor groove formwork treatment in the circumferential direction of the lining. Furthermore, the circumferential slipform allows for timely manual finishing of the poured concrete surface, significantly improving the construction quality of the bottom arch concrete surface and the appearance quality of the pre-reserved groove. This improves the concrete construction quality of the bottom arch while ensuring continuous lining concrete construction. The bottom arch circumferential slipform also reduces the amount of bottom arch formwork material used, saving construction costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] In the diagram, 1-car frame, 2-bottom arch shaping steel mold, 3-side top arch shaping steel mold, 4-bottom arch sliding mold sliding positioning device, 5-bottom arch sliding mold inclined support hydraulic cylinder, 6-reserved anchor groove, 7-connecting bolt. Detailed Implementation

[0016] To make the objectives, technical solutions, and beneficial effects of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to facilitate understanding by those skilled in the art.

[0017] like Figure 1As shown, the construction method of the composite needle beam steel formwork trolley for the circumferential sliding formwork of the bottom arch of the flat tunnel includes the following steps: First step: pouring concrete for the bottom arch; Second step: pouring concrete for the bottom arch with reserved anchor slots; Third step: pouring concrete for the side and top arches. The bottom arch shaping steel formwork 2 is used to complete the lining concrete construction within its bottom arch range (bottom 120°~130° range, the bottom can be a horizontal section or a circular arc section). After the concrete within the range of the bottom arch shaping steel formwork 2 is poured, it is moved circumferentially to both sides, and the surface of the poured concrete is manually smoothed according to the strength requirements.

[0018] The aforementioned flat tunnel bottom arch circumferential sliding formwork composite needle beam steel formwork trolley includes a trolley frame 1, a bottom arch shaping steel formwork 2, a side arch shaping steel formwork 3, a bottom arch sliding formwork sliding positioning device 4, and a bottom arch sliding formwork inclined support hydraulic cylinder 5. The top and sides of the trolley frame 1 are matched with the tunnel inner wall and are supported by telescopic brackets to arrange the side arch shaping steel formwork 3. The bottom sides of the trolley frame 1 are symmetrically installed with the bottom arch shaping steel formwork 2 through the bottom arch sliding formwork sliding positioning device 4. The arch sliding formwork sliding positioning device 4 is an arc-shaped block with the same curvature as the bottom arch on both sides of the tunnel. The bottom arch shaping steel formwork 2 is slidably installed on the arch sliding formwork sliding positioning device 4 through telescopic brackets. The telescopic brackets supporting the side arch shaping steel formwork 3 and the telescopic brackets supporting the bottom arch shaping steel formwork 2 are connected by the bottom arch sliding formwork inclined support hydraulic cylinder 5. The two ends of the bottom arch sliding formwork inclined support hydraulic cylinder 5 are respectively hinged to the telescopic brackets.

[0019] This device can simultaneously realize the contraction and movement of the longitudinal side arch shaping steel mold 3 and the circumferential bottom arch shaping steel mold 2, meeting the different concrete pouring construction requirements of the bottom arch shaping steel mold 2 and the side arch shaping steel mold 3, ensuring the continuity of concrete pouring across the entire cross section, and improving the quality of concrete construction. The bottom arch shaping steel mold 2 can slide and extend in the circumferential direction of the tunnel through the push and pull of the bottom arch sliding formwork inclined support hydraulic cylinder 5. It can also be connected to the longitudinal side arch shaping steel mold 3 by sliding upward in the circumferential direction, which can meet the requirements of individual use and combined use.

[0020] The moving trajectory of the bottom arch shaping steel mold 2 covers the location of the reserved anchor groove 6. Both the bottom arch shaping steel mold 2 and the side top arch shaping steel mold 3 are equipped with connecting bolts 7 at their ends. The bottom arch shaping steel mold 2 and the side top arch shaping steel mold 3 are connected by the connecting bolts 7. The two arch sliding positioning devices 4 on both sides of the bottom of the trolley frame 1 can realize the bottom arch shaping steel mold 2 to complete the circumferential sliding within the range of 120° to 130°. This can effectively solve the problem of the prestressed anchor groove template reserved in the circumferential direction of the lining. At the same time, the circumferential sliding can promptly perform manual finishing on the surface of the poured concrete, which greatly improves the construction quality of the bottom arch concrete surface and the appearance quality of the reserved groove.

[0021] The working process of this invention: The construction method of the flat tunnel bottom arch circumferential slipform composite needle beam steel formwork trolley is divided into three steps: the first step is the pouring of the bottom arch concrete, the second step is the pouring of the bottom arch concrete with reserved anchor slots, and the third step is the pouring of the side top arch concrete.

[0022] First, the composite needle beam steel formwork trolley is moved, and the bottom arch shaping steel formwork 2 is slidably installed on the arch sliding formwork sliding positioning device 4 via the telescopic bracket. The bottom arch range is 120° to 130° from the bottom. The bottom arch sliding formwork inclined support hydraulic cylinder 5 pulls or pushes the telescopic bracket to move the bottom arch shaping steel formwork 2 on the arch sliding formwork sliding positioning device 4. Then, the bottom arch shaping steel formwork 2 is fixed by the telescopic bracket, completing the lining concrete construction at different positions within the bottom 120° to 130° range. The bottom of the lowest arch can be a horizontal section or a circular arc section structure. The construction of the lining concrete can be completed by moving the bottom arch shaping steel mold 2. This solves the problem of circumferential slipforming in tunnels to achieve concrete lining construction in the bottom arch area. It also enables the needle beam steel mold trolley to move longitudinally and circumferentially. The two arch slipform sliding positioning devices 4 on both sides of the bottom of the trolley frame 1 can enable the bottom arch shaping steel mold 2 to complete circumferential slipforming within the range of 120° to 130°. The range of 120° to 130° covers the location of the reserved anchor groove 6, which can effectively solve the problem of prestressed anchor groove template treatment in the circumferential direction of the lining.

[0023] Secondly, the bottom arch shaping steel mold 2 is moved to the reserved anchor groove 6 by sliding the arch sliding positioning device 4. The telescopic bracket is stretched and fixed to fix the bottom arch shaping steel mold 2 at the reserved anchor groove 6. The bottom arch concrete of the reserved anchor groove 6 is poured, the defect is handled and the anchor groove formwork is removed. After the bottom arch concrete of the reserved anchor groove is poured, the bottom arch shaping steel mold 2 is moved to both sides in a circumferential direction. The surface of the poured concrete is manually smoothed according to the strength requirements. The bottom arch circumferential sliding formwork system composed of the bottom arch shaping steel mold 2 and the bottom arch sliding positioning device 4 effectively solves the problem of the prestressed anchor groove formwork reserved in the circumferential direction of the lining. At the same time, the circumferential sliding formwork can promptly perform manual smoothing on the surface of the poured concrete, which greatly improves the construction quality of the bottom arch concrete surface and the appearance quality of the reserved groove.

[0024] Then, after the concrete pouring within the bottom arch area is completed, the bottom arch shaping steel mold 2 is rotated by the hydraulic cylinder 5 of the bottom arch sliding formwork inclined support so that the bottom arch shaping steel mold 2 and the side top arch shaping steel mold 3 are connected and fixed by the connecting bolts 7 set at their ends. The side top arch concrete is then poured, and the concrete is placed in the formwork for vibration and layered pouring. This improves the concrete construction quality of the bottom arch while meeting the requirements for continuous construction of the lining concrete.

[0025] Finally, the device is demolded, the composite needle beam steel mold trolley is moved forward, defects in the completed concrete pouring are repaired, and the concrete is cured.

[0026] This invention satisfies the requirements of conventional needle beam steel formwork for longitudinal side arch concrete lining construction, while simultaneously solving the problem of achieving bottom arch concrete lining construction using circumferential slipform in tunnels. It enables the needle beam steel formwork trolley to move longitudinally and circumferentially. The bottom arch circumferential slipform system, composed of the bottom arch shaping steel formwork 2 and the bottom arch slipform sliding positioning device 4, effectively solves the problem of prestressed anchor groove formwork treatment in the circumferential direction of the lining. Furthermore, the circumferential slipform allows for timely manual finishing of the poured concrete surface, significantly improving the construction quality of the bottom arch concrete surface and the appearance quality of the pre-reserved groove. This improves the concrete construction quality of the bottom arch while ensuring continuous lining concrete construction. The bottom arch circumferential slipform also reduces the amount of bottom arch formwork material used, saving construction costs.

[0027] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A construction method for a composite needle beam steel formwork trolley with circumferential slipform for the bottom arch of a flat tunnel, characterized in that: The flat tunnel bottom arch circumferential sliding formwork composite needle beam steel formwork trolley includes a trolley frame (1), a bottom arch shaping steel formwork (2), a side top arch shaping steel formwork (3), a bottom arch sliding formwork sliding positioning device (4), and a bottom arch sliding formwork inclined support hydraulic cylinder (5). The top and sides of the trolley frame (1) are matched with the tunnel inner wall and are supported by telescopic brackets to arrange the side top arch shaping steel formwork (3). The bottom sides of the trolley frame (1) are respectively equipped with bottom arch shaping steel formwork (2) through the bottom arch sliding formwork sliding positioning device (4). The two bottom arch shaping steel formwork (2) are symmetrically arranged. The arch sliding formwork sliding positioning device (4) is the same as the arc of the bottom arch on both sides of the tunnel. The arc-shaped block, the bottom arch fixed steel mold (2) is slidably installed on the arch sliding mold sliding positioning device (4) through the telescopic bracket. The support telescopic bracket of the side top arch fixed steel mold (3) and the support telescopic bracket of the bottom arch fixed steel mold (2) are connected by the bottom arch sliding mold inclined support hydraulic cylinder (5). The two ends of the bottom arch sliding mold inclined support hydraulic cylinder (5) are respectively hinged to the telescopic bracket, which can simultaneously realize the shrinkage and movement of the longitudinal side top arch fixed steel mold (3) and the circumferential bottom arch fixed steel mold (2), meet the different concrete pouring construction requirements of the bottom arch fixed steel mold (2) and the side top arch fixed steel mold (3), and ensure the continuity of the full-section concrete pouring; The construction method involves the following steps: Step 1: Move the composite needle beam steel mold trolley and slide the bottom arch fixed steel mold (2) onto the arch sliding mold sliding positioning device (4) through the telescopic bracket. The bottom arch range is the bottom 120°~130° range. Pull or push the telescopic bracket through the bottom arch sliding mold inclined support hydraulic cylinder (5) to drive the bottom arch fixed steel mold (2) to move on the arch sliding mold sliding positioning device (4). Then fix the bottom arch fixed steel mold (2) through the telescopic bracket to complete the lining concrete construction at different positions within the bottom 120°~130° range. The bottom of the bottom arch can be a horizontal section or a circular arc section structure. The horizontal section or circular arc section structure can be completed by moving the bottom arch fixed steel mold (2) to complete the lining concrete construction. Step 2: Slide the bottom arch shaping steel mold (2) through the arch sliding positioning device (4) to move the bottom arch shaping steel mold (2) to the reserved anchor groove (6), stretch and fix the telescopic bracket to fix the bottom arch shaping steel mold (2) at the reserved anchor groove (6), pour the bottom arch concrete of the reserved anchor groove (6), complete the defect treatment and the removal of the anchor groove template. After the bottom arch concrete of the reserved anchor groove is poured, move the bottom arch shaping steel mold (2) to both sides in a circumferential direction, and perform manual finishing on the surface of the poured concrete according to the strength requirements. Step 3: After the concrete pouring within the bottom arch area is completed, rotate the bottom arch shaping steel mold (2) so that the bottom arch shaping steel mold (2) and the side top arch shaping steel mold (3) are connected and fixed through the connecting bolts (7) set at their ends, and carry out the side top arch concrete pouring to complete the concrete placement vibration and layered pouring treatment. Step 4: Demolding the device, moving the composite needle beam steel mold trolley forward, then repairing defects in the completed concrete pouring, and curing the concrete. The movement trajectory of the bottom arch shaping steel mold (2) covers the location of the reserved anchor groove (6); the maximum sliding angle of the two bottom arch shaping steel molds (2) on the two arch sliding mold sliding positioning devices (4) on both sides of the bottom of the trolley frame (1) is 120° to 130°.

2. The construction method of a flat-bottomed arch ring circumferential slip-form composite needle beam steel mold trolley according to claim 1, characterized in that: The bottom arch forming steel mold (2) and the side top arch forming steel mold (3) are both provided with connecting bolts (7) at their ends, and the bottom arch forming steel mold (2) and the side top arch forming steel mold (3) are connected by connecting bolts (7).

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