CN209873811U - Subway major structure medium plate also serves as temporary supporting structure - Google Patents

Abstract

The utility model belongs to the technical field of subway engineering construction, in particular to a middle plate of a subway main structure doubled as a temporary support structure. The utility model comprises a middle plate, a continuous wall, a side wall and a lattice column. The two ends of the middle plate are connected with the continuous wall through the steel bars reserved for the continuous wall and the oblique tension bars of the middle plate; Horizontal pallets and supporting pallets welded on the structural columns are supported; a small section of the side wall is above and below the connection between the middle plate and the continuous wall; a horizontal grouting pipe is reserved on the side of the side wall close to the continuous wall; The vertical grouting pipe is left to be connected with the horizontal grouting pipe. On the one hand, the utility model can reduce one or two concrete supports, greatly shorten the construction period and save investment; Foundation pit construction risks.

Description

The middle plate of the main structure of the subway doubles as a temporary support structure

technical field

The utility model belongs to the technical field of subway engineering construction, in particular to a middle plate of a main structure of a subway double as a temporary support structure.

Background technique

Conventional subway foundation pit construction is to first construct the enclosure structure (diaphragm wall or cast-in-place pile, etc.), and then gradually excavate and construct various supports. After excavating to the bottom of the foundation pit, pour the station floor, then remove the upper support, and pour the side walls , middle plate, and gradually pour the main structure upwards. Temporary supports in the construction of subway foundation pits require a lot of investment, but their service life is short, and they are usually dismantled after several months of use. Not only does pouring and dismantling require a lot of manpower and material resources, but it also takes a lot of time to wait for the concrete setting period and concrete removal. The construction period, and the disposal of these construction wastes also has adverse effects on the environment.

Utility model content

In view of the above-mentioned problems, the utility model provides a subway main structure mid-slab which doubles as a temporary support structure. During the construction of the subway project, the main structure mid-slab is constructed first, and the main structure mid-slab doubles as a temporary support.

The utility model is designed to use the middle plate of the main structure of the subway as a temporary support structure, including the middle plate, the continuous wall, the side wall, and the lattice column; The ties are connected to the diaphragm wall; the middle part of the middle plate is supported by the horizontal tray and the support tray panel welded on the lattice column; a small section of the side wall is above and below the connection between the middle plate and the diaphragm wall; A horizontal grouting pipe is reserved on the side wall close to the continuous wall; a reserved vertical grouting pipe is connected to the horizontal grouting pipe.

Further, the reserved reinforcing bars of the diaphragm wall are reserved reinforcing bars of the diaphragm wall; the diagonal tie bars of the middle plate are welded to the main bars of the diaphragm wall.

Further, the height of the horizontal tray is equal to the bottom surface of the middle plate.

Further, the reserved surface at the lower end of the side wall is an inclined surface toward the foundation pit.

Further, the main side wall reinforcement, reinforcement connectors, and waterproof steel plates are reserved in the side wall.

Further, the vertical grouting pipes are connected with horizontal grouting pipes every 3m.

The middle plate of the main structure of the station has high rigidity and its position is close to the supporting position. The utility model constructs the middle plate of the main structure of the station first by changing the construction process, and uses the middle plate of the station to replace the second or and a third support. In this way, on the one hand, one or two supports can be reduced, which greatly shortens the construction period and saves investment. On the other hand, the rigidity of the middle plate is high, which can effectively improve the overall stability of the foundation pit and reduce the risk of foundation pit construction.

The utility model follows the reduction (Reduce) principle in the 3R principle of resource circular economy, and realizes the reduction of concrete support in the temporary enclosure structure, and has the following advantages: 1. Reduce the cost of temporary structure pouring and demolition, and reduce Garbage disposal reduces environmental pollution; 2. Saves concrete support pouring, waiting for setting period, and concrete demolition period, which can effectively save the construction period; 3. The rigidity of the middle plate structure is good for the safety of the foundation pit enclosure structure, which can effectively reduce Excavation risk. The utility model has the advantages of simple operation and can bring good economic and social benefits.

Description of drawings

Figure 1 is a schematic diagram of a conventional foundation pit support section.

Fig. 2 is a schematic diagram of the main structure of the subway station.

Fig. 3 is a cross-sectional schematic diagram of the foundation pit support of the utility model.

Figure 4 is a schematic diagram of the connection between the middle plate and the continuous wall.

Figure 5 is a schematic diagram of the joint between the middle plate and the lattice column.

Fig. 6 is a schematic diagram of lattice column tray nodes.

Among them: 1. Middle plate, 2. Diaphragm wall, 3. Concrete support, 4. Rebar connector, 5. Main side wall reinforcement, 6. Side wall, 7. Waterproof steel plate, 8. Vertical grouting pipe, 9. Horizontal grouting pipes, 10. Reinforcement bars reserved for diaphragm walls, 11. Diagonal ties for middle plates, 12. Lattice columns, 13. Support tray panels, 14. Horizontal trays, 15. Base plates, 16. Top plates.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the utility model, and the detailed implementation and specific operation process are given, but the protection scope of the utility model is not limited to the following examples.

As shown in Figures 1-2, the conventional subway foundation pit construction is to first construct the enclosure structure such as the diaphragm wall 2, and then gradually excavate and construct various concrete supports 3, and pour the station floor 15 after excavating to the bottom of the foundation pit, and then Remove the upper concrete support 3, pour the side walls 6, the middle plate 1, and gradually pour the main structure upwards.

As shown in Figure 3, the middle plate of the main structure of the subway designed by the utility model doubles as a temporary support structure. By changing the construction process, the middle plate 1 of the main structure of the station is constructed first, and the middle plate 1 of the station has the characteristics of high rigidity and suitable position. The second or third concrete support 3 is replaced by the middle plate 1 .

As shown in Figures 2 to 6, the middle plate of the main structure of the subway is also used as a temporary support structure, including the middle plate 1, the diaphragm wall 2, the side wall 6, and the lattice column 12; the two ends of the middle plate 1 are reserved through the diaphragm wall. 10 and the oblique reinforcement 11 of the middle plate are connected with the continuous wall 2; the middle part of the middle plate 1 is supported by the horizontal tray 14 welded on the lattice column 12 and the supporting tray panel 13; a small section of the side wall 6 is in the middle Above and below the connection between the plate 1 and the diaphragm wall 2; a horizontal grouting pipe 9 is reserved on the side wall 6 close to the diaphragm wall 2; a reserved vertical grouting pipe 8 is connected to the horizontal grouting pipe 9 every 3m .

The reserved reinforcing bar 10 of the diaphragm wall is the reserved reinforcing bar of the diaphragm wall 2;

The height of the horizontal tray 14 is equal to the bottom surface of the middle plate 1 .

Both the upper and lower reserved surfaces of the side wall 6 need to be chiseled, and the reserved surface at the lower end is an inclined surface toward the foundation pit. The side wall 6 needs to reserve the main side wall steel bar 5 and the steel bar connector 4 according to the design requirements, and at the same time, a waterproof steel plate 7 needs to be pre-embedded in the side wall 6 .

The utility model replaces the concrete support in the original foundation pit support system with the middle slab of the main structure constructed later, and solves the structural load of the middle slab caused by the first construction of the middle slab structure and the pouring of concrete on the side wall through certain structural measures. Issues such as pouring and construction joint waterproofing are as follows:

(1) When constructing the temporary enclosure structure (diaphragm wall or enclosure pile), it is necessary to reserve reinforcement bars 10 for the diaphragm wall as connecting reinforcement with the middle plate 1 of the main structure to bear the structural load of the middle plate 1;

(2) In addition to using the supporting function of the connection between the two ends of the middle plate 1 and the enclosure structure, it is generally necessary to use the lattice columns 12 in the existing foundation pit or re-arrange the columns to support the structural load of the middle plate 1;

(3) At the connection between the middle plate 1 and the diaphragm wall 2, a small section of side wall 6 needs to be constructed above and below the middle plate 1, and special structural construction measures are adopted to ensure that the concrete pouring of the side wall is compact and convenient for construction in the later stage, ensuring that the main body quality of structural construction;

(4) Grouting construction measures should be reserved at the 6 joints of the side wall to ensure effective waterproofing of the later construction joints.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (6)

1. The middle plate of the main structure of the subway doubles as a temporary support structure, including the middle plate (1), the continuous wall (2), the side wall (6), and the lattice column (12). It is characterized in that: the middle plate (1) The two ends are connected to the diaphragm wall (2) through the reserved reinforcing bars (10) of the diaphragm wall and the oblique tie bars (11) of the middle plate; (14) and supporting tray panel (13) support; a section of the side wall (6) is above and below the junction of the middle plate (1) and the continuous wall (2); leaning against the continuous wall at the side wall (6) (2) A horizontal grouting pipe (9) is reserved on the side; a reserved vertical grouting pipe (8) is connected to the horizontal grouting pipe (9). 2. the middle plate of the subway main structure according to claim 1 doubles as a temporary support structure, and it is characterized in that: the reserved reinforcing bar (10) of the diaphragm wall is the reserved reinforcing bar of the diaphragm wall (2); the oblique direction of the middle plate The tie bars (11) are welded to the main bars of the diaphragm wall (2). 3. The middle plate of the subway main structure according to claim 1 or 2 doubles as a temporary support structure, characterized in that: the height of the horizontal tray (14) is equal to the bottom surface of the middle plate (1). 4. The middle plate of the subway main structure according to claim 2 doubles as a temporary support structure, characterized in that: the reserved surface at the lower end of the side wall (6) is an inclined surface toward the foundation pit. 5. The middle plate of the subway main structure according to claim 4 doubles as a temporary support structure, and is characterized in that: the main side wall reinforcement (5) and reinforcement connector (4) are reserved in the side wall (6), Waterproof steel plate (7). 6. The middle plate of the subway main structure according to claim 5 doubles as a temporary support structure, characterized in that: the vertical grouting pipes (8) are connected to the horizontal grouting pipes (9) every 3m.