A non-standard support method for confined space template

Abstract

The present invention belongs to the technical field of bridge engineering, and specifically relates to a method for non-standard support of a confined space formwork. The technical scheme is as follows: the non-standard support device for a confined space formwork used includes a Bailey beam, a steel plate is arranged on the Bailey beam, and several layers of standardized steel molds are set on the steel plate, and the standardized steel molds are filled with fine sand for supporting the bridge formwork. A method for non-standard support of a confined space formwork, comprising the following steps: S1: setting up the Bailey beam, laying the steel plate on the Bailey beam; S2: assembling several layers of standardized steel molds according to the size and height of the bridge formwork; S3: pouring fine sand into the standardized steel mold and pre-pressing it; S4: laying the bridge formwork on the fine sand, and casting the beam and slab; S5: removing the bridge formwork; S6: removing the standardized steel mold and steel plate. The present invention provides a method for non-standard support of a confined space formwork.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a non-standardized support method for a confined space template. Background Art

[0002] Economic development has driven rapid growth in transportation construction, with an increasing number of bridge projects spanning canals and canyons. The mature and easy-to-use cast-in-place scaffolding method is commonly used in the construction of reinforced concrete bridge spans. However, in practice, site constraints sometimes prevent the use of full-scale scaffolding. For example, after installing a Bailey beam over a river, the height difference between the Bailey beam's upper surface and the bridge's planned height is too small to allow full-scale scaffolding to be used for the bridge formwork.

[0003] Existing technologies typically involve modifying the bridge superstructure, prefabricating, and then installing it using a crane or crane. These methods are notoriously inefficient, cost-effective, and maneuverable, making them difficult to meet the demands of the fast-paced bridge construction process. Solving the installation of bridge formwork in confined spaces and efficiently constructing bridge superstructures has become a major research topic. Effectively addressing these challenges will greatly improve the applicability of cast-in-place box girders using the scaffolding method, paving the way for their widespread adoption. Summary of the Invention

[0004] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a non-standard support method for a confined space template.

[0005] The technical solution adopted in the present invention is:

[0006] A non-standard support device for a confined space template comprises a Bailey beam, a steel plate is arranged on the Bailey beam, and several layers of standard steel molds are built on the steel plate. The standard steel molds are filled with fine sand for supporting the bridge template.

[0007] According to the bottom size and height of the bridge formwork, several layers of fixed steel formwork are assembled. Fine sand is added to the fixed steel formwork and pressed tightly, so that the bridge formwork can be stably placed on the fine sand. After the beams and slabs are cast in the bridge formwork, the fine sand is drained and the bridge formwork and the fixed steel formwork are removed, or the bridge formwork and the fixed steel formwork are directly removed. Compared with setting up a full-floor support, the fine sand in the fixed steel formwork can directly support the bridge formwork, saving space, and is suitable for casting beams and slabs under space-constrained conditions. In addition, compared with methods such as changing the superstructure of the bridge, selecting a bridge erection machine or crane for lifting after prefabrication, the present invention has higher applicability, economy, and maneuverability and flexibility, and can meet the requirements of fast-paced construction of bridge projects.

[0008] As a preferred embodiment of the present invention, a plurality of telescopic struts are connected between one or more layers of the shaped steel molds and the steel plates. The telescopic struts are connected between the shaped steel molds and the steel plates so that the telescopic struts can reliably support the two shaped steel molds, thereby preventing the fine sand from deforming due to lack of support from the shaped steel molds when the bridge formwork is erected on the fine sand.

[0009] As a preferred embodiment of the present invention, the telescopic support rod comprises a sleeve, with telescopic rods threadedly connected to both ends of the sleeve. The other end of the telescopic rod on one side is pivotally connected to the steel plate, while the other end is pivotally connected to the shaped steel mold. Both the steel plate and the shaped steel mold are provided with a plurality of connecting seats, and the ends of the telescopic rods distal from the sleeves are connected to the connecting seats via rotating pins. The telescopic rod's telescopic length within the sleeve is adjusted based on the distance between the connecting seats on the steel plate and the shaped steel mold, ensuring that the telescopic support rod can reliably support the shaped steel mold.

[0010] As a preferred embodiment of the present invention, the adjacent steel molds are connected by bolts. To prevent the steel molds from being dislocated, the adjacent steel molds need to be connected so that the fine sand inside the steel molds will not deform after being compressed, so that the fine sand can reliably support the bridge formwork.

[0011] As a preferred embodiment of the present invention, the steel formwork is provided with a plurality of sand discharge holes, each of which is plugged with a plug. After the beam and slab are cast, if the beam and slab need to be lowered and attached to the bridge support, the fine sand is first discharged from the sand discharge holes, and then the bridge formwork and beam and slab are lowered, and then the bridge formwork and steel formwork are removed.

[0012] As a preferred embodiment of the present invention, the shaped steel mold includes a plurality of steel mold frames, and adjacent steel mold frames are connected by bolts. When the shaped steel mold is spliced ​​together by a plurality of steel mold frames, when removing the shaped steel mold, the steel mold frames can be removed separately for easy lifting.

[0013] A non-standard support method for a confined space template comprises the following steps:

[0014] S1: Erect Bailey beam and lay steel plate on the Bailey beam;

[0015] S2: Assemble several layers of standard steel formwork according to the size and height of the bridge formwork;

[0016] S3: Pour fine sand into the steel mold and pre-press it;

[0017] S4: Lay bridge formwork on fine sand and cast beams and slabs;

[0018] S5: dismantling bridge formwork;

[0019] S6: Remove the steel mold and steel plate.

[0020] First, the Bailey beam support system is erected. Once this is complete, the steel plates are laid. Pre-defined slots in the steel plates connect the steel forms to the pre-formed steel. Several layers of pre-formed steel forms are assembled, depending on the beam dimensions and available space. Fine sand is poured into the pre-formed steel forms to complete the support system. The support system is pre-stressed. The bridge formwork is installed and adjusted, and the beam is cast. Finally, the bridge formwork, pre-formed steel forms, and steel plates are removed. The fine sand in the pre-formed steel forms directly supports the bridge formwork, saving space and making it suitable for casting beams and slabs in space-constrained conditions.

[0021] As a preferred embodiment of the present invention, after step S2, a plurality of telescopic struts are connected between one or more layers of the shaped steel formwork and the steel plates to support the shaped steel formwork, thereby ensuring that the bridge formwork is reliably supported.

[0022] As a preferred embodiment of the present invention, telescopic struts are connected only between the topmost steel mold and the steel plate. The length of the telescopic struts is adjusted according to the height of the topmost steel mold. The topmost steel mold is connected to the steel plate via telescopic struts, and adjacent steel molds are connected to ensure the integrity and stability of the assembled steel molds.

[0023] As a preferred embodiment of the present invention, a plurality of sand discharge holes are provided on the side wall of the shaped steel mold. Before step S3, the sand discharge holes are blocked with a plug; before step S5, the plug is removed and the fine sand is discharged. After the bridge formwork and the beam slab are lowered into place, steps S5 and S6 are performed.

[0024] The beneficial effects of the present invention are:

[0025] The fine sand in the shaped steel mold of the present invention can directly support the bridge template, saving space and being suitable for pouring beams and slabs under space-constrained conditions. The present invention has higher applicability, economy and flexibility, and can meet the requirements of fast-paced bridge construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a structural diagram of the finalized steel mold;

[0028] Figure 3 It is a structural diagram of a telescopic support rod.

[0029] In the figure, 1-Bailey beam; 2-steel plate; 3-shaped steel mold; 4-telescopic support rod; 31-sand discharge hole; 41-sleeve; 42-telescopic rod. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0031] like Figure 1 As shown, the non-standard support device for confined space formwork of this embodiment includes a Bailey beam 1, a steel plate 2 is provided on the Bailey beam 1, and several layers of standardized steel molds 3 are erected on the steel plate 2. The standardized steel molds 3 are filled with fine sand for supporting the bridge formwork.

[0032] According to the bottom size and height of the bridge formwork, several layers of shaped steel formwork 3 are assembled. Fine sand is added to the shaped steel formwork 3 and pressed tightly, so that the bridge formwork can be stably placed on the fine sand. After the beams and slabs are cast in the bridge formwork, the fine sand is drained and the bridge formwork and the shaped steel formwork 3 are removed, or the bridge formwork and the shaped steel formwork 3 are directly removed. Compared with setting up a full-floor support, the fine sand in the shaped steel formwork 3 can directly support the bridge formwork, saving space, and is suitable for casting beams and slabs under space-constrained conditions. In addition, compared with methods such as changing the superstructure of the bridge, selecting a bridge erection machine or crane for lifting after prefabrication, the present invention has higher applicability, economy, and maneuverability and flexibility, and can meet the requirements of fast-paced construction of bridge projects.

[0033] A plurality of telescopic struts 4 are connected between the uppermost shaped steel formwork 3 and the steel plate 2. The telescopic struts 4 are connected between the shaped steel formwork 3 and the steel plate 2 so that the telescopic struts 4 can reliably support the two shaped steel forms 3, thereby preventing the fine sand from being deformed due to lack of support from the shaped steel formwork 3 after the bridge formwork is set up on the fine sand.

[0034] Among them, such as Figure 3 As shown, the telescopic support rod 4 comprises a sleeve 41, with telescopic rods 42 threadedly connected at both ends of the sleeve 41. The other end of the telescopic rod 42 on one side is pivotally connected to the steel plate 2, while the other end is pivotally connected to the shaped steel mold 3. Both the steel plate 2 and the shaped steel mold 3 are provided with a plurality of connecting blocks, and the ends of the telescopic rods 42 distal from the sleeve 41 are connected to the connecting blocks via rotating pins. The telescopic length of the telescopic rods 42 within the sleeve 41 is adjusted according to the distance between the connecting blocks on the steel plate 2 and the shaped steel mold 3 to ensure that the telescopic support rod 4 can reliably support the shaped steel mold 3.

[0035] In order to avoid misalignment of the shaped steel molds 3, the adjacent shaped steel molds 3 are connected by bolts. After the adjacent shaped steel molds 3 are connected, the fine sand in the shaped steel molds 3 will not be deformed after being compressed, so that the fine sand can reliably support the bridge template.

[0036] like Figure 2As shown, the steel formwork 3 is provided with a plurality of sand discharge holes 31, each of which is plugged with a plug. After the beam and slab are cast, if the beam and slab need to be lowered and overlapped on the bridge support, the fine sand is first discharged from the sand discharge holes 31, and then the bridge formwork and beam and slab are lowered, and then the bridge formwork and steel formwork 3 are removed.

[0037] Furthermore, the shaped steel mold 3 includes a plurality of steel mold frames, and adjacent steel mold frames are connected by bolts. When the shaped steel mold 3 is spliced ​​together by a plurality of steel mold frames, when the shaped steel mold 3 is removed, the steel mold frames can be removed separately for easy lifting.

[0038] A non-standard support method for a confined space template comprises the following steps:

[0039] S1: Erect Bailey beam 1 and lay steel plate 2 on Bailey beam 1;

[0040] S2: According to the size and height of the bridge formwork, connect the bottom layer of fixed steel formwork 3 to the limit groove reserved on the steel plate 2, and assemble and bolt several layers of fixed steel formwork 3 on the bottom layer of fixed steel formwork 3; connect several telescopic struts 4 between the top layer of fixed steel formwork 3 and the steel plate 2;

[0041] S3: Pour fine sand into the shaped steel mold 3 and pre-press it;

[0042] S4: Lay bridge formwork on fine sand and cast beams and slabs;

[0043] S5: dismantling bridge formwork;

[0044] S6: Remove the steel mold 3 and the steel plate 2.

[0045] First, the Bailey beam 1 support system is erected. Once this is complete, the steel plate 2 is laid. Pre-set slots in the steel plate 2 connect the steel formwork 3 to the pre-set steel formwork 3. Several layers of pre-set steel formwork 3 are assembled, depending on the beam size and available space. Fine sand is poured into the pre-set steel formwork 3 to complete the support system. The support system is pre-stressed. The bridge formwork is installed and adjusted, and the beam is cast. Finally, the bridge formwork, pre-set steel formwork 3, and steel plate 2 are removed. The fine sand in the pre-set steel formwork 3 directly supports the bridge formwork, saving space and making it suitable for casting beams and slabs in space-constrained conditions.

[0046] If the bridge template is pre-installed with supports, the beam and slab do not need to be lowered after pouring, as the beam and slab are integrated with the supports. Thus, when removing the formwork, the bridge template can be directly removed first, and then the shaped steel formwork 3 and the steel plate 2 can be removed.

[0047] If the bridge formwork lacks pre-reserved supports and there's a gap between the cast beams and the supports, the beams must be lowered onto the supports before removing the formwork. Remove the plugs, allowing fine sand to drain from the sand drain holes 31. Once the bridge formwork is free of sand, it can be lowered. Once the beams are lowered onto the supports, the bridge formwork, steel formwork 3, and steel plate 2 can be removed.

[0048] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any technical solution that falls within the scope defined by the claims of the present invention falls within the scope of protection of the present invention.

Claims

1. A non-standard support method for a confined space template, characterized in that: A non-standard support device for a confined space formwork is used, the non-standard support device for a confined space formwork comprising a Bailey beam (1), a steel plate (2) being arranged on the Bailey beam (1), a plurality of layers of shaped steel molds (3) being arranged on the steel plate (2), the shaped steel molds (3) being filled with fine sand for supporting the bridge formwork; adjacent shaped steel molds (3) being connected by bolts; a plurality of sand discharge holes (31) being arranged on the shaped steel molds (3), the sand discharge holes (31) being plugged with plugs; the shaped steel molds (3) comprising a plurality of steel mold frames, adjacent steel mold frames being connected by bolts; The steps include: S1: erecting a Bailey beam (1), and laying a steel plate (2) on the Bailey beam (1); S2: Assemble several layers of standardized steel formwork (3) according to the size and height of the bridge formwork; S3: Pour fine sand into the shaped steel mold (3) and pre-press it; S4: Lay bridge formwork on fine sand and cast beams and slabs; S5: Removal of bridge formwork; S6: Remove the shaping steel mold (3) and the steel plate (2).

2. A method for supporting a confined space formwork in a non-standard manner according to claim 1, characterized in that: After step S2, a plurality of telescopic support rods (4) are connected between one or more layers of the shaping steel mold (3) and the steel plate (2).

3. A method for supporting a confined space formwork in a non-standard manner according to claim 2, characterized in that: The telescopic support rod (4) is connected only between the uppermost shaping steel mold (3) and the steel plate (2), and the length of the telescopic support rod (4) is adjusted according to the height of the uppermost shaping steel mold (3).

4. The method for non-standardized support of a confined space template according to claim 1, characterized in that: The side wall of the shaped steel mold (3) is provided with a plurality of sand discharge holes (31). Before step S3, the sand discharge holes (31) are blocked with plugs; before step S5, the plugs are removed and fine sand is discharged. After the bridge formwork and the beam slab are lowered into place, steps S5 and S6 are performed.

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