Unequal-height side formwork device for rockfill dam panel concrete pouring

Abstract

The utility model relates to a kind of unequal high side mould device for rock-fill dam panel concrete pouring, including side mould plate main body and mould plate lateral fixing mechanism, copper water stop, lower sand cushion layer foundation, copper water stop is installed in lower sand cushion layer foundation top, side mould plate main body is vertically installed on copper water stop, and mould plate lateral fixing mechanism is installed on copper water stop and lower sand cushion layer foundation and carries out reinforcement support to side mould plate main body;Side mould plate main body is made of wooden formwork and the steel structure framework of composite in its outside, and steel structure framework includes the top angle steel fixed in the top of wooden formwork and the vertical flat steel fixed in the inner and outer side of wooden formwork by connecting piece, and top angle steel constitutes the running track of sliding formwork;Mould plate lateral fixing mechanism includes the triangular support of angle steel and the anchoring member for anchoring triangular support to dam body.The utility model effectively solves the problem of insufficient rigidity of formwork, poor adaptability and not closely combined with sliding formwork track in unequal thick panel pouring of rock-fill dam.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy and hydropower engineering construction technology, and in particular to an unequal height side formwork device for concrete pouring of rockfill dam face. Background Technology

[0002] Concrete-faced rockfill dams, as a type of dam constructed using locally sourced materials, are widely used due to their ease of construction and wide applicability. The concrete face, as the primary seepage barrier in this type of dam, is crucial to the quality of its construction. Concrete faces are constructed using a slipform process, meaning the side formwork must bear the lateral pressure of the concrete and serve as the track foundation for the slipform construction. Furthermore, given the unequal thickness of the face, the structural design of the side formwork significantly impacts the quality of the concrete's formation. Using pure steel formwork requires extensive cutting to accommodate height variations, resulting in material waste and construction inconvenience. Using pure wood formwork, however, lacks rigidity, makes deformation control difficult, and compromises the required face alignment and flatness for the slipform track. Summary of the Invention

[0003] This utility model aims to address the shortcomings of existing technologies by providing a non-uniform height side formwork device for concrete pouring of rockfill dam panels.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a side formwork device for pouring concrete for rockfill dam panels, comprising a side formwork body and a side formwork fixing mechanism, a copper waterstop, and a lower sand cushion foundation. The copper waterstop is installed on the top of the lower sand cushion foundation, the side formwork body is vertically installed on the copper waterstop, and the side formwork fixing mechanism is installed on the copper waterstop and the lower sand cushion foundation to reinforce and support the side formwork body.

[0005] The side formwork is composed of wooden formwork and a steel frame composite on its outer side. The steel frame includes a top angle steel fixed to the top of the wooden formwork and several vertical flat steels fixed to the inner and outer sides of the wooden formwork by connectors. The top angle steel forms the running track of the slipform.

[0006] The lateral fixing mechanism of the template includes a triangular bracket made of angle steel and anchoring fasteners for anchoring the triangular bracket to the dam body. The upper end of the triangular bracket is detachably fixed to a vertical flat steel or a top angle steel.

[0007] Specifically, the thickness of the wooden formwork is not less than 5cm, and its height gradually changes along the dam slope to accommodate the variable thickness design of the panels.

[0008] Specifically, adjacent wooden templates are joined together by flat wedge grooves set on their contact surfaces.

[0009] In particular, a copper waterstop groove is provided on the lower inner side of the wooden formwork, and the height of the groove is higher than the height of the copper waterstop nose set at the vertical seam of the panel.

[0010] Specifically, geotextile is installed between the lateral fixing mechanism of the template and the copper waterstop to isolate and protect the copper waterstop.

[0011] Specifically, the anchor is an anchoring steel rod, which passes through the bottom of the triangular bracket and penetrates into the dam body for a length greater than 20cm.

[0012] Specifically, the vertical flat steel is fastened to the wooden formwork using square-head bolts and hexagonal nuts.

[0013] The beneficial effects of this utility model are:

[0014] This utility model adopts a steel-wood composite structure, which not only takes advantage of the fact that wood is easy to cut on site to adapt to changes in height, but also provides sufficient rigidity and strength through the steel structure frame composed of angle steel and flat steel, effectively resisting the lateral pressure of concrete, and serving as a flat and reliable slipform track.

[0015] The template rests directly on the pre-installed copper waterstop through the pre-reserved groove at the bottom, ensuring accurate positioning and quick installation. Wooden templates of varying heights are joined using flat wedge groove joints, guaranteeing a smooth transition in panel thickness.

[0016] The overall stability of the formwork during the pouring process was ensured by using laterally fixed triangular supports and anchoring steel rods that penetrate deep into the dam body. Geotextile fabric was used to effectively isolate the lateral formwork fixing mechanism from the copper waterstop, preventing damage to critical seepage-proof components during construction.

[0017] The main materials used in this invention are conventional wood and structural steel, resulting in low costs. Most components can be prefabricated in the factory and assembled on-site, leading to high construction efficiency and significant overall economic benefits. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the planar structure of the side template body of this utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the side template body of this utility model;

[0020] Figure 3 This is a schematic diagram of the side template body, the template lateral fixing mechanism, and the copper waterstop installation position of this utility model;

[0021] In the diagram: 1-Side formwork body; 11-Wooden formwork; 12-Top angle steel; 13-Vertical flat steel; 14-Flat wedge groove joint; 15-Copper waterstop reserved groove; 2-Formwork lateral fixing mechanism; 21-Triangular bracket; 22-Anchor; 3-Copper waterstop; 4-Geotextile;

[0022] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0024] like Figures 1-3 As shown, an unequal-height side formwork device for concrete pouring of rockfill dam face includes a side formwork body 1, a formwork lateral fixing mechanism 2, a copper waterstop 3, and a lower sand cushion foundation. The copper waterstop 3 is installed on the top of the lower sand cushion foundation, the side formwork body 1 is vertically installed on the copper waterstop 3, and the formwork lateral fixing mechanism 2 is installed on the copper waterstop 3 and the lower sand cushion foundation to reinforce and support the side formwork body 1.

[0025] The side formwork body 1 consists of a wooden formwork 11 and a steel frame composite on its outer side. The steel frame includes a top angle steel 12 fixed to the top of the wooden formwork 11 and several vertical flat steels 13 fixed to the inner and outer sides of the wooden formwork 11 via connectors. The top angle steel 12 forms the running track of the slipform, and the vertical flat steels 13 are fastened to the wooden formwork 11 with square head bolts and hexagonal nuts. The top angle steel 12 not only strengthens the rigidity of the top of the wooden formwork, but more importantly, it forms the running track of the slipform. This steel-wood composite design combines the flexibility of the wooden formwork 11, which is easy to process to adapt to changes in height, with the excellent rigidity and stability provided by the steel structure, ensuring smooth operation of the slipform and high-quality concrete molding.

[0026] The thickness of the wooden formwork 11 is not less than 5cm, and its height gradually changes along the dam slope to accommodate the variable thickness design of the panel.

[0027] The adjacent wooden formwork 11 are spliced ​​together by a flat wedge groove joint 14 set on their contact surface. The design of the flat wedge groove joint 14 greatly optimizes the stress performance at the joint, increases the contact area, makes the load transfer more uniform, effectively prevents misalignment and deformation at the joint under the lateral pressure of concrete, and ensures a smooth appearance at the splice.

[0028] A copper waterstop pre-reserved groove 15 is provided on the lower inner side of the wooden formwork 11. The height of this groove is higher than the height of the nose of the copper waterstop 3 set at the vertical seam of the panel. This groove allows the wooden formwork 11 to "sit" precisely on the pre-installed copper waterstop 3, providing perfect accommodation and protection space for the nose part of the copper waterstop 3, and utilizing the copper waterstop 3 itself as part of the bottom support of the formwork, simplifying the installation and ensuring precise positioning.

[0029] The lateral fixing mechanism 2 of the formwork includes a triangular bracket 21 made of angle steel and anchoring fasteners 22 for anchoring the triangular bracket 21 to the dam body. The upper end of the triangular bracket 21 is detachably fixed to the vertical flat steel 13 or the top angle steel 12. The structure of the triangular bracket 21 provides excellent anti-tilting stability. Its upper end is rigidly connected to the side formwork body 1, and its lower end is fixed by the anchoring fasteners 22, forming a reliable force transmission path and effectively transmitting the lateral pressure of the concrete to the dam body.

[0030] A geotextile 4 is installed between the lateral fixing mechanism 2 of the template and the copper waterstop 3 to isolate and protect the copper waterstop 3. As a flexible buffer layer, the geotextile 4 effectively isolates the rigid triangular support 21 from the sensitive copper waterstop 3, preventing the triangular support 21 from scratching or squeezing the copper waterstop 3 during installation and reinforcement, and playing an important protective role for the key seepage prevention element.

[0031] Anchor 22 is an anchoring steel rod that passes through the bottom of the triangular bracket 21 and extends into the dam body for a length greater than 20cm. The sufficiently long anchoring depth ensures that the lateral fixing mechanism 2 of the formwork will not be pulled up or loosened under any working conditions, providing the final foundation guarantee for the entire formwork system, and the stability meets the requirements of the construction specifications.

[0032] Before installing the side formwork, the dam slope is treated. First, the extruded sidewall is divided into a 5m x 5m grid, and any over- or under-grid areas are addressed. After treatment, a foundation trench approximately 60cm wide and 30cm deep is excavated at the panel joint locations, i.e., the side formwork placement locations, and filled with a mortar cushion layer. After the mortar cushion layer reaches a certain strength, copper waterstops 3 are installed. Then, the main body of the side formwork 1 is assembled and placed on the copper waterstops 3. Next, the lateral fixing mechanism 2 is installed, and geotextile 4 is laid for protection. Finally, it is completely fixed with anchoring steel stakes. During concrete pouring, the slipform slides along the track formed by the top angle steel 12, effectively resisting concrete pressure and forming a panel with the designed gradually varying thickness.

[0033] The main body of the side formwork 1 adopts a steel-wood composite structure, which ensures the rigidity of the formwork to resist the lateral pressure of the concrete, and the angle steel at the top can be directly used as a slipform track, integrating functions and ensuring structural stability. The wooden formwork 11 is easy to cut on site and perfectly adapts to the design of uneven panel thickness; the steel structure frame can be prefabricated in the factory, allowing for quick on-site assembly and low overall cost. The wooden formwork 11 is precisely connected to the copper waterstop 3 through the pre-reserved groove at the bottom, making installation convenient; the geotextile 4 effectively isolates the lateral fixing mechanism 2 of the formwork, preventing damage to key waterstop components. This utility model effectively solves the problems of insufficient formwork rigidity, poor adaptability, and loose connection with the slipform track in the pouring of uneven panel thickness in rockfill dams.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A unequal-height side formwork device for pouring concrete for rockfill dam face panels, characterized in that, It includes a side template body (1) and a template lateral fixing mechanism (2), a copper water stop (3), and a lower sand cushion foundation. The copper water stop (3) is installed on the top of the lower sand cushion foundation. The side template body (1) is vertically installed on the copper water stop (3), and the template lateral fixing mechanism (2) is installed on the copper water stop (3) and the lower sand cushion foundation to reinforce and support the side template body (1). The side formwork body (1) is composed of a wooden formwork (11) and a steel structure frame composite on its outer side. The steel structure frame includes a top angle steel (12) fixed to the top of the wooden formwork (11) and several vertical flat steels (13) fixed to the inner and outer sides of the wooden formwork (11) by connectors. The top angle steel (12) forms the running track of the slipform. The template lateral fixing mechanism (2) includes a triangular bracket (21) made of angle steel and an anchor (22) for anchoring the triangular bracket (21) to the dam body. The upper end of the triangular bracket (21) is detachably fixed to a vertical flat steel (13) or a top angle steel (12).

2. The unequal-height side formwork device for concrete pouring of rockfill dam face panels according to claim 1, characterized in that, The thickness of the wooden formwork (11) is not less than 5cm, and its height gradually changes along the dam slope to accommodate the variable thickness design of the panel.

3. The unequal-height side formwork device for concrete pouring of rockfill dam face panels according to claim 1, characterized in that, The adjacent wooden templates (11) are spliced ​​together by a flat wedge groove joint (14) set on their contact surface.

4. A unequal-height side formwork device for concrete pouring of rockfill dam face panels according to claim 1, characterized in that, A copper waterstop reserved groove (15) is provided on the lower inner side of the wooden template (11), and the height of the groove is higher than the nose height of the copper waterstop (3) set at the vertical seam of the panel.

5. A unequal-height side formwork device for concrete pouring of rockfill dam face panels according to claim 1, characterized in that, A geotextile (4) is provided between the template lateral fixing mechanism (2) and the copper water stop (3) to isolate and protect the copper water stop (3).

6. A unequal-height side formwork device for concrete pouring of rockfill dam face panels according to claim 1, characterized in that, The anchor (22) is an anchoring steel rod that passes through the bottom of the triangular bracket (21) and penetrates into the dam body for a length greater than 20cm.

7. A unequal-height side formwork device for concrete pouring of rockfill dam face panels according to claim 1, characterized in that, The vertical flat steel (13) is fastened to the wooden template (11) by square head bolts and hexagonal nuts.

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