CN204590038U - A kind of permanent foundation pit supporting construction - Google Patents

Abstract

The utility model discloses a permanent foundation pit supporting structure, which comprises an underground continuous wall which is constructed around the foundation pit and fully integrated with the main structure, and an inner lining wall close to the outer layer of the underground continuous wall. There are several purlins and the basement floor at the bottom of the lining wall in turn, horizontal supports are provided between the two opposite purlins, and supports for supporting the horizontal supports are provided at the bottom of the two intersecting horizontal supports column. The permanent foundation pit support structure enhances the stability and anti-seepage performance of the diaphragm wall through the combination of the underground diaphragm wall and the lining wall. The setting of multiple purlins, horizontal supports and support columns is conducive to strengthening the foundation pit support structure Excellent support strength and rigidity, so that the foundation pit support structure can be used for a long time, and used as a permanent foundation pit support, thereby effectively avoiding resource waste and environmental pollution. This utility model is used in the field of building structures.

Description

A permanent foundation pit support structure

technical field

The utility model relates to the field of building structures, in particular to a permanent foundation pit supporting structure.

Background technique

Traditional foundation pit support structures are mostly temporary structures, which will be abandoned and permanently placed underground after the basement construction is completed. Some temporary structures must be dismantled, resulting in a large waste of resources, high construction risks, and long construction periods. , environmental pollution and other issues.

In order to solve the above problems, actively develop the support form that combines the foundation pit support structure with the permanent structure, so that the foundation pit support structure can be used as a part of the main structure of the basement, which can avoid resource waste and environmental pollution, shorten the construction period, and reduce construction risks. , Reduce project cost.

Utility model content

In order to solve the above problems, the utility model provides a permanent foundation pit support structure that can provide permanent support to avoid waste of resources and environmental pollution.

The technical scheme that the utility model solves its technical problem adopts is:

A permanent foundation pit support structure, including an underground diaphragm wall that is fully integrated with the main structure around the foundation pit and an inner lining wall that is close to the outer layer of the underground diaphragm wall. A number of purlins and the basement floor at the bottom of the lining wall, horizontal supports are provided between the two opposite purlins, and support columns for supporting the horizontal supports are provided at the bottom of the two intersecting horizontal supports.

As a further improvement of the technical solution of the utility model, support piles are provided at the bottom of each support column, and the bottom of the support column is embedded in the support pile.

As a further improvement of the technical solution of the utility model, the support piles are reinforced concrete cast-in-situ piles, and the support columns are steel lattice columns.

As a further improvement of the technical solution of the utility model, reserved steel bars perpendicular to the underground diaphragm wall are reserved in the underground diaphragm wall, and the purlins, basement floor and horizontal supports are fixed to the inner lining wall or the underground diaphragm wall through the reserved steel bars connect.

As a further improvement of the technical solution of the utility model, the inner lining wall is a reinforced concrete wall, and the thickness of the inner lining wall is 200mm-400mm.

Beneficial effects of the utility model: the permanent foundation pit supporting structure enhances the stability and impermeability of the continuous wall through the combination of the underground continuous wall and the lining wall, and the setting of multiple purlins, horizontal supports and supporting columns has It is beneficial to enhance the support strength and rigidity of the foundation pit support structure, so that the foundation pit support structure can be used for a long time and used as a permanent foundation pit support, thereby effectively avoiding resource waste and environmental pollution.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is a side sectional view of the overall structure of the utility model embodiment;

Fig. 2 is a top view of the overall structure of the embodiment of the utility model.

Detailed ways

Referring to Fig. 1 and Fig. 2, the utility model is a permanent foundation pit support structure, including an underground diaphragm wall 1 which is fully integrated with the main structure around the foundation pit and an inner lining wall close to the outer layer of the underground diaphragm wall 1 2. A number of purlins 3 and a basement floor 7 located at the bottom of the lining walls 2 are arranged in sequence from top to bottom along each lining wall 2. Horizontal supports 4 are provided between the two opposing purlins 3, located at the two intersections. The bottom of the horizontal support 4 is provided with a support column 6 for supporting the horizontal support 4 .

This permanent foundation pit support structure enhances the stability and anti-seepage performance of the diaphragm wall through the combination of the underground diaphragm wall 1 and the lining wall 2. The support strength and rigidity of the foundation pit support structure enable the foundation pit support structure to be used for a long time and be used as a permanent foundation pit support, thereby effectively avoiding resource waste and environmental pollution.

The underground diaphragm wall 1 is used as a water stop wall and a retaining wall of the foundation pit enclosure structure, and can also be used as a permanent outer wall of the basement simultaneously. The underground diaphragm wall 1 needs to meet the strength, stiffness, stability and anti-leakage requirements of foundation pit support, and also meet other requirements of the code for permanent underground diaphragm walls. The connecting steel bars for purlin 3, horizontal support 4, basement floor 7 and lining wall 2 reserved in the underground diaphragm wall 1 for subsequent construction.

The lining wall 2 can ensure the smoothness of the basement wall surface and good waterproof effect. Before the lining wall 2 is poured, the underground diaphragm wall 1 needs to be chiseled to improve the tightness of the two.

As a preferred embodiment of the present invention, the bottom of each support column 6 is provided with a support pile 5 , and the bottom of the support column 6 is embedded in the support pile 5 .

Each horizontal support 4 is supported by the vertical support form composed of the support column 6 and the support pile 5, which facilitates the construction of the vertical support. The bottom of the support pile 5 is embedded in the deep underground structure, which is conducive to strengthening the foundation pit support structure overall stability.

The horizontal support 4 is in the form of T-beams combined with floor belts and beams, and pure floor belts are provided when necessary. Figure-of-eight supports can be set at the 4 ends of the horizontal support, and connecting rod supports can be set between the supports.

In this foundation pit support structure, the strength of reinforcement and concrete shall not be lower than the requirements of the permanent structure, the spacing of the supports and the width of the slab as the horizontal support 4 shall meet the requirements of construction operations and earthwork excavation space, and the strength, stiffness and stability of the supports shall meet the requirements of the foundation pit. Pit support requirements.

Horizontal support 4 is reserved for connecting steel bars with subsequent construction floors, beams and structural columns. A concrete pouring hole is reserved at the junction of the horizontal support 4 and the column, and the inner diameter of the concrete pouring hole is 100 mm to 150 mm.

As a preferred embodiment of the present invention, the support pile 5 is a reinforced concrete pouring pile, and the support column 6 is a steel lattice column.

As a preferred embodiment of the present invention, the underground diaphragm wall 1 is reserved with reserved steel bars perpendicular to the underground diaphragm wall 1, and each purlin 3, basement floor 7 and horizontal support 4 pass through the reserved steel bars and the lining wall 2 Or the underground diaphragm wall 1 is fixedly connected.

As a preferred embodiment of the present invention, the inner lining wall 2 is a reinforced concrete wall, and the thickness of the inner lining wall 2 is 200mm-400mm.

The purlin 3 is a T-shaped member composed of the floor belt near the wall and the segmented lining wall. The reinforcement and concrete strength in the purlin 3 and the thickness of the segmented lining wall are not lower than the requirements of the permanent structure. The purlin 3 can be The corners of the foundation pit and the floor at the connection with the support are provided with tuck angles, and the segmented lining walls, floor belts and tuck angles meet the strength, stiffness and stability requirements of the foundation pit support.

The purlin 3 is reserved for the connection reinforcement with the subsequent construction floor slab and the lining wall 2, and at the same time, waterproof measures are taken for the construction joints of the lining wall in sections. Concrete pouring holes for the subsequent lining wall shall be reserved for the surrounding purlin 3, with an inner diameter of 100mm to 150mm and a spacing of 2m to 3m.

The supporting pile 5 adopts the reinforced concrete cast-in-place pile of the main structure, and the supporting column 6 adopts the steel lattice column. When the position of the permanent pile cannot be used, a temporary lower cast-in-place pile and a steel lattice column are added as the supporting pile.

The steel lattice column is welded with angle steel and steel plate, the cross section is square, and the side length is generally not more than 600mm. The steel lattice column is inserted into the lower reinforced concrete pouring pile to a certain depth. The supporting piles 5 and the supporting columns 6 meet the strength, rigidity and stability requirements of foundation pit support. The joint of the horizontal support 4 and the support column 6 adopts a well-shaped hoop to enhance its overall stability, and the well-shaped hoop is welded by angle steel and steel plate stiffeners close to the steel lattice column.

During the construction of the main structure of the basement, the soil in the steel lattice column is cleaned first, then the column reinforcement is installed according to the section size of the main structural column in the later stage, the formwork is installed and concrete is poured, so that the steel lattice column becomes a part of the structural column. For the temporary support piles added when the permanent piles cannot be used, the steel lattice columns can be cut and removed after the main structure of the basement is completed.

The earthwork excavation of the foundation pit and the construction of the basement adopt the straight method, that is, a layer of earthwork is excavated to construct a support, and when the excavation reaches the bottom of the pit, the basement floor 7 is constructed. Since the construction of the engineering piles has been completed in advance, the use time of the foundation pit has been shortened. The basement floor 7 is firstly constructed around the foundation pit, and then the middle part, which further reduces the construction risk and effectively guarantees the safety of the foundation pit.

Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art can also make equivalent modifications or replacements without violating the spirit of the present utility model. These equivalent modifications or replacements are all included in the claims of this application. within the limited range.

Claims (5)

1. A permanent foundation pit support structure, characterized in that: it includes an underground diaphragm wall (1) that is fully integrated with the main structure around the foundation pit and an inner lining that is close to the outer layer of the underground diaphragm wall (1) Walls (2), a number of purlins (3) and a basement floor (7) located at the bottom of the lining walls (2) are arranged in turn along each of the lining walls (2) from top to bottom. Horizontal supports (4) are provided between the purlins (3), and support columns (6) for supporting the horizontal supports (4) are provided at the bottom of two intersecting horizontal supports (4). 2. The permanent foundation pit support structure according to claim 1, characterized in that: the bottom of each support column (6) is provided with a support pile (5), and the bottom of the support column (6) is embedded in the support pile (5). 3. The permanent foundation pit support structure according to claim 2, characterized in that: the support piles (5) are reinforced concrete pouring piles, and the support columns (6) are steel lattice columns. 4. The permanent foundation pit support structure according to any one of claims 1 to 3, characterized in that: the underground diaphragm wall (1) is reserved with a pre-set vertical to the underground diaphragm wall (1). Steel bars are reserved, and the purlins (3), basement floor (7) and horizontal support (4) are fixedly connected to the lining wall (2) or the underground diaphragm wall (1) through the reserved steel bars. 5. The permanent foundation pit support structure according to any one of claims 1-3, characterized in that: the inner lining wall (2) is a reinforced concrete wall, and the thickness of the inner lining wall (2) is 200mm ~ 400mm.