CN211816267U - Deep foundation pit support structure - Google Patents

Abstract

The utility model relates to the field of foundation pits, in particular to a deep foundation pit enclosure structure, which comprises a foundation pit body, wherein a slope is formed on the side of the foundation pit body toward the center, and a vertical slope is inserted into the foundation pit body. A plurality of connected Larsen steel sheet piles, the slope is provided with a drain hole, and a drain pipe connected to the outside and both ends is inserted and fixed in the drain hole, and the drain pipe is inclined downward, A support body is formed on the slope surface, and the support body includes a two-way steel mesh sheet laid on the slope surface and a connecting hook connected between the two-way steel mesh and the slope. The utility model has the effect of improving the stability of the slope side wall of the foundation pit body.

Description

A deep foundation pit enclosure structure

technical field

The utility model relates to the technical field of foundation pits, in particular to a deep foundation pit enclosure structure.

Background technique

The foundation pit is a soil pit excavated at the base design position according to the base elevation and the size of the base plane. It is a particularly complex project, which mainly includes the design and construction of the foundation pit support system and the earthwork excavation. It is a highly comprehensive systematic project.

Because the soil in coastal areas is mainly caused by artificial sand filling on the surface, and the soil conditions on the side walls of the foundation pit are poor, in order to avoid landslides during the excavation of the foundation pit, the outer wall of the foundation pit will be sloped first, so that the It can be more stable during foundation pit construction.

Chinese Patent Publication No. CN110206039A discloses a construction method for Larsen steel sheet piles in pits with complex geological conditions, comprising the following steps: S1, construction of Larsen steel sheet piles, S2, construction of pits in pits, S3, construction of cushion layers and caps, S4, temporary slope construction, S5, diagonal bracing system installation, S6, basement shear wall construction, S7, removal of Larsen steel sheet piles. The present invention provides a brand-new support system, which firstly carries out the construction of the pit in the pit and its surrounding cushion layer, pours the cap, and uses the support function of the cap at the wellhead of the pit in the pit to install inclined planes between the cap and the Larsen steel sheet piles. A diagonal bracing system composed of braces and central pillars.

In the above technical solution, a temporary slope is set up, but because there will be groundwater behind the sidewall of the slope, when the pressure of the groundwater is too high, the sidewall of the foundation pit will easily collapse, causing danger.

Utility model content

In view of the deficiencies of the prior art, the purpose of the present invention is to provide a deep foundation pit enclosure structure capable of improving the stability of the foundation pit body.

The above purpose of the present utility model is achieved through the following technical solutions: a deep foundation pit enclosure structure, comprising a foundation pit body, the foundation pit body is formed with a slope toward the center side, and the foundation pit body is inserted with a A plurality of Larsen steel sheet piles are connected vertically, and the slope is provided with a drain hole, and a drain pipe connected to the outside and both ends is inserted and fixed in the drain hole. Tilt down setting.

By adopting the above technical solution, the drain pipe inserted in the drain hole can connect the outside world with the soil behind the side wall of the slope, so that the groundwater in the soil of the side wall of the slope can be drained, and the soil behind the side wall of the slope can be drained. The water pressure can improve the stability of the side wall of the foundation pit and avoid danger during the construction process.

In a preferred example of the present invention, it can be further configured that: the drainage hole is filled with clay surrounding the outer wall of the middle section of the drainage pipe.

By adopting the above technical solution, the clay is used to stabilize the drain pipe inserted in the drain hole, thereby preventing the drain pipe from falling out of the slope and failing to achieve the effect of connecting the outside and the back of the side wall of the slope.

In a preferred example of the present invention, it can be further configured that: the end of the drainage hole located at the end of the drainage pipe extending into the slope is filled with medium-coarse sand.

By adopting the above technical solution, because the particle size of medium and coarse sand is slightly larger, when it has a certain stabilization effect on the drain pipe, a certain gap can be formed behind the side wall of the slope at the same time. Maintaining the connection, balancing the pressure, and using medium-coarse sand can also have a certain filtering effect, avoiding the blockage of the drain pipe and failing to achieve the connection effect.

In a preferred example of the present invention, it can be further configured as follows: the outer wall of the end of the drain pipe extending into the slope is provided with a plurality of water seepage holes, and the end of the drain pipe extending into the slope is covered with an 80-mesh filter screen cloth, the filter cloth is located in medium-coarse sand.

By adopting the above technical solution, the filter cloth can filter the water entering the drain pipe, so as to prevent the soil behind the side wall of the slope from falling from the seepage hole and blocking the entire drain pipe. Connecting the outside and the rear of the slope side wall will not achieve the effect of balancing the pressure.

In a preferred example of the present invention, it can be further configured that: the slope surface is formed with a support body, and the support body includes a two-way steel mesh sheet laid on the slope surface, and is connected between the two-way steel mesh sheet and the slope. connection hook.

By adopting the above technical solution, one end of the connecting hook is inserted into the side wall of the slope, and one end is clamped to the two-way steel mesh, so that the two-way steel mesh can be fixed on the surface of the side wall of the slope. Temporary support effect to improve the stability of slope side walls.

In a preferred example of the present invention, a concrete surface layer is sprayed between the two-way steel mesh and the slope surface, and one end of the drain pipe protrudes from the concrete surface layer.

By adopting the above technical solutions, the overall strength of the support body can be improved by relying on the concrete surface layer, and the two-way steel mesh can be stabilized, thereby reinforcing the slope side wall and avoiding the collapse of the slope side wall and affecting the subsequent construction.

In a preferred example of the present invention, it can be further configured that: the surface of the foundation pit body along its periphery and the bottom surface of the foundation pit body are located at the toe of the slope, and a drainage ditch is opened.

By adopting the above technical scheme, the groundwater generated during the excavation of the foundation pit body can be discharged in a centralized manner by means of the drainage ditch, so as to avoid random flow and influence on the subsequent construction inside the foundation pit body.

In a preferred example of the present invention, it can be further configured as follows: bricks or corrugated pipes are placed in the drainage ditch.

By adopting the above technical solution, the bottom of the drainage ditch and the bottom of the foundation pit body can be isolated by means of bricks or corrugated pipes, so that the groundwater collected in the drainage ditch will not re-infiltrate into the bottom of the foundation pit body, which can effectively Collect and process groundwater to improve the stability of the sidewall of the foundation pit.

To sum up, the present utility model includes the following beneficial technical effects:

The inclined drain pipe inserted in the drain hole can discharge the groundwater in the soil behind the side wall of the slope, so that the drain pipe connects the outside world with the soil layer behind the side wall of the slope, balances the internal and external pressure, and lifts the side of the slope. the stability of the wall;

The clay and medium-coarse sand in the drain hole are used to fix the drain pipe and filter and isolate it respectively. Combined with the filter cloth set outside the drain pipe, it can have a good filtering effect on the drain pipe and avoid the drain pipe. It is blocked and affects its communication and drainage effect.

Description of drawings

FIG. 1 is a schematic structural diagram of a vertical section of the present embodiment.

FIG. 2 is a partial cross-sectional schematic diagram mainly used for embodying the drain assembly in this embodiment.

FIG. 3 is a schematic diagram mainly used for embodying a support body in this embodiment.

Reference numerals: 1. Foundation pit body; 2. Slope; 3. Larsen steel sheet pile; 4. Drainage hole; 5. Drainage pipe; 6. Clay; 7. Medium-coarse sand; 8. Seepage hole; Mesh; 10. Supporting body; 101. Two-way reinforced mesh; 102. Connecting hook; 103. Concrete surface layer; 11. Drainage ditch;

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

Referring to Fig. 1, it is a kind of deep foundation pit enclosure structure disclosed by the utility model, comprising a foundation pit body 1 forming an inner pit, and a side wall with a looser soil quality of the foundation pit body 1 is formed with an inclination towards the center of the foundation pit body 1 Compared with the upper end of the slope 2, the bottom end of the slope 2 is closer to the center of the foundation pit body 1, and the slope of the slope 2 is determined according to the actual soil conditions. In order to improve the stability of the slope 2, at the side wall of the slope 2 A drain assembly 12 is provided to connect the soil layer behind the side wall of the slope 2 and the outside world, so that the groundwater in the soil layer behind the side wall of the slope 2 can be discharged to the outside, so as to prevent the groundwater in the soil layer behind the side wall of the slope 2 from affecting the slope 2. stability has an impact.

Referring to FIG. 2 , a plurality of drain assemblies 12 can be provided on the side wall of the slope 2 according to actual needs. The drain assembly 12 includes a drain hole 4 opened on the side wall of the slope 2. The center of the drain hole 4 is horizontal, and the drain hole 4 is horizontal. The water hole 4 runs through the outer wall of the slope 2 and is connected to the soil layer behind the side wall of the slope 2. A water discharge pipe 5 is arranged in the water discharge hole 4. The central axis of the water discharge pipe 5 is inclined downward, and the water discharge pipe 5 extends. Since one end of the side wall of the slope 2 is lower than the end located in the drain hole 4, the included angle between the central axis of the drain pipe 5 and the horizontal line is 15°. Both ends of the drain pipe 5 are penetrated. In order to make the drain pipe 5 more stably placed in the drain hole 4, the middle position of the drain pipe 5 in the drain hole 4 is filled with clay 6, and the clay 6 is wrapped around the drain pipe. The outer wall of 5 is tightly filled in the drain hole 4, the clay 6 is used to stabilize the drain pipe 5, and the inclination angle of the drain pipe 5 is also determined at the same time, so that the groundwater in the soil layer behind the side wall of the slope 2 can pass through the drain pipe 5. flow out.

Because the end of the drain pipe 5 located in the drain hole 4 will be in contact with the soil layer behind the side wall of the slope 2, in order to prevent the soil from blocking the drain pipe 5, the drain hole 4 at the end of the drain pipe 5 is filled with medium Coarse sand 7 and medium-coarse sand 7 surround the outer wall of the drain pipe 5 , so that the end of the drain pipe 5 located in the drain hole 4 is placed in the medium-coarse sand 7 . In order to improve the drainage capacity of the drain pipe 5 , the outer wall of the end of the drain pipe 5 located in the drain hole 4 is provided with a plurality of seepage holes 8 , so that the groundwater behind the side wall of the slope 2 can pass through the seepage holes 8 and enter the drain pipe 5 At the same time, the outer wall of the water seepage hole 8 at the end of the drain pipe 5 is covered with an 80-mesh filter cloth 9, and the part of the filter cloth 9 is placed in the middle and coarse sand 7 layers. Tie it tightly to the outer wall of the drain pipe 5 , or use a rubber ring to hold the filter cloth 9 tightly to the outer wall of the drain pipe 5 , so that the filter cloth 9 can be fixed to the end of the drain pipe 5 .

Referring to FIG. 3, in order to improve the stability of the side wall of the slope 2, a support body 10 is laid on the surface of the side wall of the slope 2. A part of the reinforced mesh 101 is embedded in the soil layer of the side wall of the slope 2, and at the same time, a connecting hook 102 is hooked on the two-way reinforced mesh 101, and the upper end of the connecting hook 102 is a hook and is hooked to the two-way reinforced mesh. 101, the lower end outer wall of the connecting hook 102 is integrally formed with an upwardly bent ground hook 14, and the bottom of the lower end of the connecting hook 102 is inserted into the soil layer of the side wall of the slope 2, so that the two-way steel mesh 101 can be stably laid on the ground. The surface of the side wall of the slope 2, at the same time, a position for extending the drain pipe 5 is reserved at the two-way steel mesh 101, and then a concrete surface layer 103 (marked in Figure 2) is sprayed on the surface of the two-way steel mesh 101. The layer 103 is formed of concrete, and the two-way steel mesh 101 is formed in the concrete surface layer 103, which has a better stabilization effect on the surface of the side wall of the slope 2.

Referring to Fig. 1, a drainage ditch 11 recessed downward is provided on the upper surface of the foundation pit body 1 along its periphery and the bottom surface of the foundation pit body 1 is located at the foot of the slope 2. Bricks or a corrugated pipe 13 with an upper opening is fixedly placed, and the upper surface and bottom surface of the foundation pit body 1 are set to be inclined toward the side of the drainage ditch 11, so that the seepage groundwater can flow into the drainage ditch 11 and be discharged centrally. to collect.

The implementation principle of this embodiment is: relying on the drain pipe 5 to connect the outside world with the soil layer behind the side wall of the slope 2 to balance the pressure inside and outside, so that the groundwater in the soil layer behind the side wall of the slope 2 can be discharged through the drain pipe 5 to the outside. , and combined with the two-way steel mesh 101 and the sprayed concrete surface layer 103 have a stabilizing effect on the side wall of the slope 2, so that the side wall of the slope 2 is difficult to collapse.

The examples of this specific embodiment are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore: all equivalent changes made according to the structure, shape and principle of the present invention are not It should be covered within the protection scope of the present invention.

Claims (8)

1. The utility model provides a deep basal pit retaining structure, includes the basic pit body (1), basic pit body (1) is formed with slope (2) towards center one side, basic pit body (1) interpolation is equipped with and is vertical many larsen steel sheet piles (3) that are connected, its characterized in that: the slope (2) is provided with a drain hole (4), a drain pipe (5) which is communicated with the outside and has two through ends is fixedly inserted into the drain hole (4), and the drain pipe (5) is arranged in a downward inclined mode.

2. A deep foundation pit enclosure structure according to claim 1, wherein: and clay (6) surrounding the outer wall of the middle section of the drain pipe (5) is filled in the drain hole (4).

3. A deep foundation pit enclosure structure according to claim 2, wherein: the tail end of the drain hole (4) which is positioned at the position where the drain pipe (5) extends into the slope (2) is filled with medium coarse sand (7).

4. A deep foundation pit enclosure structure according to claim 3, wherein: the water drain pipe (5) stretches into and has seted up a plurality of infiltration holes (8) in the terminal outer wall in slope (2), water drain pipe (5) stretch into the terminal cladding in slope (2) have 80 mesh filter screen cloth (9), filter screen cloth (9) are located coarse sand (7).

5. A deep foundation pit enclosure structure according to claim 1, wherein: the supporting body (10) is formed on the surface of the slope (2), and the supporting body (10) comprises a bidirectional steel bar net piece (101) paved on the surface of the slope (2) and a connecting hook (102) connected between the bidirectional steel bar net piece (101) and the slope (2).

6. A deep foundation pit enclosure structure according to claim 5, wherein: a concrete surface layer (103) is sprayed between the bidirectional reinforcing mesh (101) and the surface of the slope (2), and one end of the drain pipe (5) extends out of the concrete surface layer (103).

7. A deep foundation pit enclosure structure according to claim 5, wherein: and drainage ditches (11) are formed in the surface of the foundation pit body (1) along the periphery of the foundation pit body and the slope toe of the bottom surface of the foundation pit body (1) positioned on the slope (2).

8. A deep foundation pit enclosure structure according to claim 7, wherein: bricks or corrugated pipes (13) are laid in the drainage ditch (11).

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