CN210529711U

CN210529711U - Pre-arranged inclined supporting structure in pit before deep foundation pit excavation

Info

Publication number: CN210529711U
Application number: CN201920811452.6U
Authority: CN
Inventors: 王辉; 陈凯; 李继承; 王星; 魏倩
Original assignee: China Construction Third Engineering Bureau Co Ltd
Current assignee: China Construction Third Engineering Bureau Co Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2020-05-15
Anticipated expiration: 2029-05-31

Abstract

The utility model relates to a preset oblique supporting structure in a pit before excavation of a deep foundation pit, which comprises an upper oblique component and a lower oblique component, wherein the upper oblique component and the lower oblique component are connected in a detachable mode to form an integrated oblique support; before excavation of foundation pit earthwork, the oblique supporting structure is obliquely inserted into soil in the foundation pit at an inclination angle of 10-80 degrees along the horizontal direction and the vertical direction of the foundation pit according to a set horizontal interval and a set vertical interval; after the foundation pit is excavated, the upper end of the upper inclined member is connected with the foundation pit support structure through the purlin, and the lower end of the lower inclined member is anchored in the soil body below the basement structure bottom plate. The utility model discloses be applied to the deep basal pit of excavation depth within 20m, because the upper portion slant component of slant bearing structure can effectively transmit the load to the soil body below the hole bottom, more conventional foundation ditch supporting construction, can effectively reduce vertical foundation ditch retaining structure's anchor depth; the problem of supporting construction top horizontal displacement is big is solved, has the advantage that construction speed is fast, with low costs.

Description

Pre-arranged inclined supporting structure in pit before deep foundation pit excavation

Technical Field

The utility model relates to a deep basal pit engineering construction technical field, concretely relates to predetermine diagonal bracing structure in hole before deep basal pit excavation.

Background

In order to effectively control the horizontal deformation during foundation pit excavation and effectively control the deep foundation pit engineering with the excavation depth within 20m, enclosing structures such as cantilever piles, double-row piles and horizontal inner supports or a supporting form of profile steel inclined cast supports and soil retaining is often adopted, and measures such as pit bottom reinforcement are adopted. The arrangement and the dismantling of the structural form have the problems of long construction period occupation, high economic cost and the like.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lie in to the setting that above-mentioned prior art exists with demolish that construction period is long, economic cost is high not enough, provide a preset diagonal bracing structure in the hole before the deep basal pit excavation, it solves foundation ditch engineering excavation in-process foundation ditch soil body horizontal deformation, construction period, economic cost's the difficult control problem within 20m, have characteristics such as construction convenience, efficient, with low costs.

The utility model discloses a solve the technical scheme that technical problem that the aforesaid provided adopted and be:

a preset inclined supporting structure in a pit before deep foundation pit excavation is carried out, wherein the inclined supporting structure comprises an upper inclined member and a lower inclined member, and the upper inclined member and the lower inclined member are detachably connected to form an integrated inclined support; before excavation of the foundation pit earthwork, the oblique supporting structure is obliquely inserted into soil in the foundation pit at an inclination angle of 10-80 degrees along the horizontal direction and the vertical direction of the foundation pit according to a set horizontal interval and a set vertical interval, wherein the upper oblique member is positioned in the soil within the pit bottom, and the lower oblique member is positioned in the soil below the pit bottom; after the foundation pit is excavated, the upper end of the upper inclined member is connected with the foundation pit support structure through the purlin, and the lower end of the lower inclined member is anchored in the soil body below the basement structure bottom plate.

In the above scheme, the upper inclined member adopts a structural form of profile steel, cast-in-place reinforced concrete or a prefabricated member, the lower inclined member adopts a structural form of a reinforced concrete structure, a PHC tubular pile, a cement-soil mixing pile or a high-pressure jet grouting pile, and the lower end of the upper inclined member is inserted into the upper end of the lower inclined member.

In the scheme, the soil body around the lower inclined component is reinforced by grouting according to the field geological conditions, so that the bearing capacity of the inclined supporting structure is improved.

In the above scheme, the horizontal distance of the oblique supporting structures is 6-8 m.

In the above scheme, the vertical distance between the oblique supporting structures is 3-6 m.

In the above scheme, the oblique supporting structures are arranged in parallel two by two.

The beneficial effects of the utility model reside in that:

1. before foundation ditch earthwork excavation, through inciting somebody to action the utility model discloses an oblique bearing structure sets up in advance in the building foundation ditch, can solve the deep basal pit of the excavation degree of depth within 20m and for control foundation ditch deformation need set up the time limit for a project and the cost problem that supporting construction and reinforcement measure such as cantilever pile, double row pile, level internal support, pit end reinforcement brought. Meanwhile, the inclined support structure is different from a conventional inclined cast support and is arranged after soil body with a certain width is reserved along the edge of the foundation pit and is subjected to back pressure in the foundation pit excavation process.

2. The utility model discloses a slant bearing structure form is simple, construction convenience, and more conventional foundation ditch bearing structure has that the construction speed is fast, advantage with low costs, can execute before foundation ditch earthwork excavation and do in the hole, and the foundation ditch earthwork excavation in-process is connected upper portion slant component through enclosing purlin and foundation ditch retaining structure in proper order, can effectively improve the bulk rigidity and the horizontal rigidity of excavation supporting system, solves the big problem of supporting structure top horizontal displacement.

3. The utility model discloses an area occupied after the slant bearing structure installation is little, and it is little to dig fortune and basement structure construction to the foundation ditch earthwork.

4. The utility model discloses an oblique bearing structure's structural style is simple, and the operation space requirement is little, and it is convenient to install, can repeat the turnover use.

5. Adopt the utility model discloses predetermine diagonal bracing structure in the hole before the deep basal pit excavation, be the foundation ditch engineering go on smoothly, improve the important guarantee of efficiency of construction and economic nature.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

FIG. 1 is an installation schematic diagram of a diagonal support structure preset in a pit before excavation of a deep foundation pit of the utility model;

fig. 2 is the utility model discloses predetermine diagonal bracing structure's structure picture in the hole before the deep basal pit excavation.

In the figure: 10. an angled support structure; 11. an upper diagonal member; 12. a lower diagonal member; 20. a foundation pit support structure; 21. enclosing purlins; 30. earthwork outside the foundation pit; 40. earthwork at the bottom of the pit; 50. basement structure.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-2, for the utility model discloses an inclined support structure is predetermine in the pit before the deep basal pit excavation of a preferred embodiment, can set up before the foundation ditch excavation in the building foundation ditch of excavation depth within 20 m. The inclined support structure 10 comprises an upper inclined member 11 and a lower inclined member 12, the upper inclined member 11 and the lower inclined member 12 are detachably connected to form an integral inclined support, and the inclined support structure 10 is convenient to construct by adopting the sectional structure. Specifically, the upper inclined member 11 is formed by structural steel, cast-in-place reinforced concrete or prefabricated members, the lower inclined member 12 is formed by a reinforced concrete structure, a PHC pipe pile, a cement mixing pile or a high-pressure jet grouting pile, and the lower end of the upper inclined member 11 is inserted into the upper end of the lower inclined member 12 for a certain length.

The diagonal support structure 10 may be provided in a plurality of courses in a vertical direction according to the excavation depth of the foundation pit. Before excavation of the foundation pit earthwork, each inclined support structure 10 is manufactured, and the inclined support structures 10 are obliquely inserted into soil in the foundation pit at an inclination angle of 10-80 degrees in advance along the horizontal direction and the vertical direction of the foundation pit according to a set horizontal interval and a set vertical interval, wherein the upper inclined member 11 is positioned in the soil within the pit bottom, and the lower inclined member 12 is positioned in the soil below the pit bottom (namely, in the pit bottom earthwork 40). And then excavating all layers of earthwork of the foundation pit to a set depth till the bottom of the pit. Before excavation of the earthwork of the foundation pit, the inclined support structure 10 is arranged in the building foundation pit in advance, so that the problems of construction period and cost caused by the fact that support structures and reinforcement measures such as cantilever piles, double-row piles, horizontal inner supports and pit bottom reinforcement are needed to be arranged for controlling foundation pit deformation in a deep foundation pit with the excavation depth within 20m can be solved. Meanwhile, the form of the inclined support structure 10 is different from that of a conventional inclined cast support which needs to be arranged after soil body with a certain width is reserved along the edge of a foundation pit and is subjected to back pressure in the foundation pit excavation process. The utility model discloses an oblique bearing structure 10, more conventional foundation ditch bearing structure, have that the construction speed is fast, advantage with low costs, can effectively improve the bulk rigidity and the horizontal rigidity of excavation supporting system, solve the big problem of supporting structure top horizontal displacement.

After the foundation pit is excavated, the upper end of the upper inclined member 11 is connected with the foundation pit support structure 20 through the purlin 21, and the lower end of the lower inclined member 12 is anchored in the soil body below the bottom plate of the basement structure 50. Through the connection of upper portion diagonal member 11 and corresponding purlin 21, can transmit the soil pressure on foundation ditch envelope 20 to lower part diagonal member 12 and the soil body. The upper diagonal member 11 is removed after the construction of the basement structure 50 is completed. The foundation pit support structure 20 is arranged on the inner side of the earthwork 30 on the outer side of the foundation pit and is inserted into the pit bottom for a certain distance.

Further preferably, in this embodiment, soil around the lower diagonal member 12 within a certain range is reinforced by grouting according to field geological conditions, so as to improve the bearing capacity of the diagonal support structure 10.

Further preferably, in this embodiment, the horizontal distance between the diagonal support structures 10 is 6-8m, the vertical distance is 3-6m, and every two diagonal support structures 10 are arranged in parallel.

The utility model discloses a hole is preset slant bearing structure 10 before the deep basal pit excavation, is applied to the deep basal pit that the excavation degree of depth is within 20m, because the upper portion slant component 11 of slant bearing structure 10 can effectively transmit the load to the soil body below the hole bottom, more conventional foundation pit supporting construction, can effectively reduce vertical foundation pit retaining structure 20's anchor degree of depth; the problem of supporting construction top horizontal displacement is big is solved, has the advantage that construction speed is fast, with low costs.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A preset inclined support structure in a pit before excavation of a deep foundation pit is characterized by comprising an upper inclined member and a lower inclined member, wherein the upper inclined member and the lower inclined member are detachably connected to form an integrated inclined support; before excavation of the foundation pit earthwork, the oblique supporting structure is obliquely inserted into soil in the foundation pit at an inclination angle of 10-80 degrees along the horizontal direction and the vertical direction of the foundation pit according to a set horizontal interval and a set vertical interval, wherein the upper oblique member is positioned in the soil within the pit bottom, and the lower oblique member is positioned in the soil below the pit bottom; after the foundation pit is excavated, the upper end of the upper inclined member is connected with the foundation pit support structure through the purlin, and the lower end of the lower inclined member is anchored in the soil body below the basement structure bottom plate.

2. The preset inclined supporting structure in the pit before excavation of the deep foundation pit according to claim 1, wherein the upper inclined member is in a structural form of profile steel, cast-in-place reinforced concrete or a prefabricated member, the lower inclined member is in a structural form of a reinforced concrete structure, a PHC (prestressed high-strength concrete) pipe pile, a cement-soil mixing pile or a high-pressure jet grouting pile, and the lower end of the upper inclined member is inserted into the upper end of the lower inclined member.

3. The preset inclined supporting structure in the pit before excavation of the deep foundation pit according to claim 1, wherein soil around the lower inclined member is reinforced by grouting according to field geological conditions so as to improve the bearing capacity of the inclined supporting structure.

4. The pre-arranged diagonal support structure in the pit before excavation of the deep foundation pit according to claim 1, wherein the horizontal distance between the diagonal support structures is 6-8 m.

5. The pre-arranged diagonal support structure in the pit before excavation of the deep foundation pit according to claim 1, wherein the vertical spacing of the diagonal support structure is 3-6 m.

6. The pre-arranged diagonal support structure in the pit before excavation of the deep foundation pit according to claim 1, wherein two diagonal support structures are arranged in parallel with each other.