Construction method of surge shaft steel lining concrete

Abstract

The invention discloses a construction method of surge shaft steel lining concrete, which comprises the following steps: firstly binding a surge shaft reinforcement cage, then constructing surge shaft side wall steel lining concrete, and then constructing surge shaft bottom plate steel lining concrete. During surge shaft side wall steel lining concrete construction, a steel lining plate is used as a formwork for concrete pouring; when the surge shaft bottom plate steel lining concrete is constructed, the steel rib plates are arranged above the bottom plate reinforcement cage, the L-shaped anchor bars are fixedly connected with the bottom plate reinforcement cage, and the surge shaft bottom plate is divided into a grid shape by welding the adjacent steel rib plates together; bottom plate concrete is poured; the bottom face of the bottom plate lining steel plate is coated with glue, bonded to the surface of concrete and connected with the side face of the steel rib plate in a welded mode. While reliable connection of the steel lining and the concrete is guaranteed, it is guaranteed that the bottom concrete is poured compactly at a time, the construction technology is simplified, the construction progress is accelerated, the construction quality is improved, and the construction cost is saved.

Description

Technical Field

[0001] This invention relates to the field of steel-lined concrete construction technology, and in particular to a construction method for steel-lined concrete in surge tanks. Background Technology

[0002] In water conservancy and hydropower projects, surge tanks are water level fluctuation buffer facilities installed between pressurized tunnels and pressure pipelines. To prevent seepage instability and hydraulic fracturing failure of surge tanks under high water head, a steel plate (i.e., steel lining) is usually added to the inner surface of the concrete for a fully enclosed design, forming a steel-lined concrete structure. However, existing steel-lined concrete construction techniques have shortcomings. If the steel lining is installed first and then the concrete is poured, the steel lining and concrete can be connected by anchor bars, but the concrete filling state cannot be directly observed after the steel lining is sealed, making vibration operation difficult to carry out effectively. Even if high-flow-state concrete is used, local voids may still occur at the contact surface due to concrete shrinkage or incomplete compaction, requiring secondary treatment by subsequent contact grouting, increasing the uncertainty of construction procedures and quality. If the concrete is poured first and then the steel lining is installed, the steel lining cannot be effectively connected to the pre-embedded anchor bars, making it difficult to form a reliable joint load-bearing system between the steel lining and concrete, affecting the overall quality of the steel-lined concrete structure. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a construction method for steel-lined concrete surge tanks that is convenient to construct, reliably connected, and produces stable pouring quality. Specifically, the following technical solution can be adopted: The construction method of the surge tank with steel-lined concrete according to the present invention first involves binding the reinforcing cage of the surge tank, then constructing the steel-lined concrete of the sidewall of the surge tank, and finally constructing the steel-lined concrete of the bottom plate of the surge tank.

[0004] The construction of the steel-lined concrete wall of the surge tank is carried out according to the following steps: S1, precast L-shaped steel bars; S2, insert and fix the horizontal section of the L-shaped steel bar onto the side wall reinforcement cage, and leave the bent section of the L-shaped steel bar inside the side wall reinforcement cage; S3, the inner steel plate of the side wall is welded to the bent section of the L-shaped steel bar, and the inner steel plate of the side wall is used as the construction template to pour the side wall concrete.

[0005] Preferably, multiple sidewall reinforcement cages are arranged radially at intervals, and each sidewall reinforcement cage is composed of circumferential reinforcement and vertical reinforcement.

[0006] Preferably, multiple sets of L-shaped steel bars are arranged from bottom to top, and each set of L-shaped steel bars contains multiple bars. The horizontal section of each L-shaped steel bar is arranged radially along the surge tank, while its bent section is arranged vertically along the surge tank.

[0007] Preferably, the horizontal section of the L-shaped steel bar passes through multiple side wall steel cages and is tied or welded to the circumferential and vertical steel bars.

[0008] The construction of the steel-lined concrete bottom plate of the surge tank is carried out according to the following steps: S1, prefabricated steel ribs, with downwardly extending L-shaped anchor bars welded onto the steel ribs; S2, place the steel ribs above the bottom plate reinforcement cage, fix the L-shaped anchor bars to the bottom plate reinforcement cage, and divide the pressure regulating well bottom plate into a grid by welding adjacent steel ribs together; S3, several bottom plate inner lining steel plates are prefabricated according to the grid shape formed by the steel ribs; S4, pour the foundation slab concrete; S5, apply adhesive to the bottom surface of the steel lining plate inside the base plate, bond it to the concrete surface, and weld it to the side of the steel rib plate.

[0009] Preferably, the L-shaped anchor bars are arranged on both sides of the steel rib plate, and the bottom support of each L-shaped anchor bar extends outward in a direction perpendicular to the steel rib plate.

[0010] Preferably, in step five, the top surface of the inner steel plate of the bottom plate is flush with the top surface of the steel rib plate.

[0011] The construction method for steel-lined concrete in surge tanks provided by this invention ensures a reliable connection between the steel lining and the concrete, while ensuring that the bottom concrete is poured densely in one go. This simplifies the construction process, accelerates the construction progress, improves the construction quality, and saves construction costs.

[0012] Compared with the prior art, the advantages of the present invention are as follows: 1) By using L-shaped steel bars / L-shaped anchor bars, the contact area between them and the steel liner and the steel cage is increased, thereby increasing the reliability of the connection between the steel liner and the concrete structure. 2) When constructing the steel-lined concrete sidewall of the surge tank, the steel lining plate is welded first and then the concrete is poured. The steel lining plate is used as a pouring template, which reduces the construction steps and saves construction costs. 3) When constructing the steel-lined concrete bottom plate of the surge tank, the steel ribs are cleverly used as connectors and separators. This allows for visible concrete filling, ensuring the quality of concrete construction, and also enables a reliable connection between the steel lining and the steel ribs after the concrete is poured, ensuring the overall structural reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the connection structure between the L-shaped steel bar and the side wall steel cage in this invention.

[0014] Figure 2This is a schematic diagram of the connection structure between the L-shaped anchor bar and the bottom plate reinforcement cage in this invention.

[0015] Figure 3 yes Figure 2 Top view. Detailed Implementation

[0016] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given. However, the scope of protection of the present invention is not limited to the following embodiments.

[0017] The construction method of the surge tank with steel-lined concrete according to the present invention first involves binding the reinforcing cage of the surge tank, then constructing the steel-lined concrete of the sidewall of the surge tank, and finally constructing the steel-lined concrete of the bottom plate of the surge tank.

[0018] The aforementioned surge tank reinforcement cage includes sidewall reinforcement cages and bottom slab reinforcement cages. Multiple sidewall reinforcement cages are arranged radially along the surge tank, each consisting of circumferential reinforcement 11 and vertical reinforcement 12. During the construction of the surge tank sidewall steel lining concrete, L-shaped reinforcement 2 is used as a connector. This L-shaped reinforcement 2 includes a horizontal section and a bent section perpendicular to it, wherein the length of the horizontal section is approximately equal to the thickness of the sidewall concrete. During the construction of the surge tank bottom slab steel lining concrete, steel ribs 3 and L-shaped anchor bars 4 are used as connectors. The aforementioned L-shaped anchor bars 4 are welded to the sidewall of the steel ribs 3, and the bottom support of each L-shaped anchor bar 4 extends outward in a direction perpendicular to the steel ribs 3. Typically, multiple pairs of L-shaped anchor bars 4 are arranged longitudinally along the steel ribs 3, with each pair of L-shaped anchor bars 4 symmetrically arranged along the center plane of the steel ribs 3.

[0019] The specific construction steps for the steel-lined concrete sidewall of the aforementioned surge tank are as follows: S1, precast L-shaped steel bar 2; S2, determine the installation height of the inner steel plate 5 of the side wall, and install the L-shaped steel bar 2 below this height; Specifically, place the L-shaped steel bar 2 inside the side wall reinforcement cage, hold the bent section, and insert the horizontal section radially outward along the circumferential steel bar 11 until the bent section reaches the side wall concrete pouring interface (see...). Figure 1 Then, the L-shaped steel bar 2 is tied or welded together with the circumferential steel bar 11 and the vertical steel bar 12; like Figure 1 As shown, there are multiple sets of L-shaped steel bars 2 arranged from bottom to top. Each set of L-shaped steel bars 2 consists of multiple bars. In order to facilitate the secure welding of the inner lining steel plate 5 of the side wall, the bent section of each L-shaped steel bar 2 is arranged vertically upward or downward along the pressure regulating well.

[0020] S3, weld the inner steel plate 5 of the side wall to the bent section of the L-shaped steel bar 2, and use the inner steel plate 5 of the side wall as a construction template to pour the side wall concrete.

[0021] The specific construction steps for the steel-lined concrete bottom plate of the aforementioned surge tank are as follows: S1, prefabricated steel rib plate 3, and L-shaped anchor bars 4 extending downward are welded on the steel rib plate 3; S2, place the steel rib plate 3 above the bottom slab reinforcement cage, and fix the L-shaped anchor bar 4 to the bottom slab reinforcement cage (see...). Figure 2 ), and by welding adjacent steel ribs 3 together, the bottom plate of the pressure regulating well is divided into a grid pattern; S3, several bottom plate inner steel plates 6 are prefabricated according to the grid shape formed by the steel ribs 3; S4, pour 7 cubic meters of concrete for the base slab; S5, apply adhesive 61 to the bottom surface of the inner steel plate 6 of the base plate and bond it to the surface of the concrete 7 of the base plate, keeping the top surface of the inner steel plate of the base plate flush with the top surface of the steel rib plate. Then, weld it together with the side of the steel rib plate 3.

[0022] Specifically, Figure 3 The first steel rib plate 31 shown is welded to the left and right sides respectively with the second steel rib plate 32 and the third steel rib plate 33, which divides the area into 4 grids; the bottom plate of one grid is constructed with a steel plate 6, and after the bottom plate lining plate 6 is bonded to the bottom plate concrete 7, the edge is welded to the first steel rib plate 31 and the second steel rib plate 32, etc.

[0023] The construction method for steel-lined concrete in surge tanks provided by this invention ensures a reliable connection between the steel lining and the concrete, while ensuring that the bottom concrete is poured densely in one go. This simplifies the construction process, accelerates the construction progress, improves the construction quality, and saves construction costs.

[0024] It should be noted that in the description of this invention, terms such as "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

Claims

1. A construction method for a steel-lined concrete surge tank, characterized in that: First, the steel reinforcement cage of the surge tank is tied, then the steel-lined concrete of the surge tank sidewall is constructed, and finally the steel-lined concrete of the surge tank bottom slab is constructed.

2. The construction method of steel-lined concrete for surge tanks according to claim 1, characterized in that, The construction of the steel-lined concrete sidewall of the surge tank is carried out according to the following steps: S1, precast L-shaped steel bars; S2, insert and fix the horizontal section of the L-shaped steel bar onto the side wall reinforcement cage, and leave the bent section of the L-shaped steel bar inside the side wall reinforcement cage; S3, the inner steel plate of the side wall is welded to the bent section of the L-shaped steel bar, and the inner steel plate of the side wall is used as the construction template to pour the side wall concrete.

3. The construction method of steel-lined concrete for surge tanks according to claim 2, characterized in that: Multiple sidewall reinforcement cages are arranged radially at intervals, and each sidewall reinforcement cage is composed of circumferential reinforcement and vertical reinforcement.

4. The construction method of steel-lined concrete for surge tanks according to claim 3, characterized in that: The L-shaped steel bars are arranged in multiple groups from bottom to top, and each group of L-shaped steel bars contains multiple bars. The horizontal section of each L-shaped steel bar is arranged radially along the surge tank, while its bent section is arranged vertically along the surge tank.

5. The construction method of steel-lined concrete for surge tanks according to claim 3, characterized in that: The horizontal section of the L-shaped steel bar penetrates multiple side wall steel cages and is tied or welded to the circumferential and vertical steel bars.

6. The construction method of steel-lined concrete for surge tanks according to claim 1, characterized in that, The construction of the steel-lined concrete bottom plate of the surge tank is carried out according to the following steps: S1, prefabricated steel ribs, with downwardly extending L-shaped anchor bars welded onto the steel ribs; S2, place the steel ribs above the bottom plate reinforcement cage, fix the L-shaped anchor bars to the bottom plate reinforcement cage, and divide the pressure regulating well bottom plate into a grid by welding adjacent steel ribs together; S3, several bottom plate inner lining steel plates are prefabricated according to the grid shape formed by the steel ribs; S4, pour the foundation slab concrete; S5, apply adhesive to the bottom surface of the steel lining plate inside the base plate, bond it to the concrete surface, and weld it to the side of the steel rib plate.

7. The construction method of steel-lined concrete for surge tanks according to claim 1, characterized in that: The L-shaped anchor bars are installed on both sides of the steel rib plate, and the bottom support of each L-shaped anchor bar extends outward in a direction perpendicular to the steel rib plate.

8. The construction method of steel-lined concrete for surge tanks according to claim 1, characterized in that: In step five, the top surface of the inner steel plate of the base plate is flush with the top surface of the steel rib plate.

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