CN210887229U - Irregular foundation pit assembled steel strutting arrangement - Google Patents

Irregular foundation pit assembled steel strutting arrangement Download PDF

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Publication number
CN210887229U
CN210887229U CN201921394546.4U CN201921394546U CN210887229U CN 210887229 U CN210887229 U CN 210887229U CN 201921394546 U CN201921394546 U CN 201921394546U CN 210887229 U CN210887229 U CN 210887229U
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steel
foundation pit
irregular
reinforced concrete
assembled
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CN201921394546.4U
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赵升峰
陈祉阳
黄莹
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Nanjing Surveying And Mapping Research Institute Co ltd
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Nanjing Surveying And Mapping Research Institute Co ltd
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Abstract

The utility model discloses an irregular foundation pit assembled steel support device and a construction application method thereof, wherein the irregular foundation pit refers to a foundation pit sideline in an irregular polygonal shape; the reinforced concrete frame structure adopts reinforced concrete cross beams and reinforced concrete slabs to form a closed supporting structure with higher rigidity; the irregular foundation pit is enclosed into a rectangular regular foundation pit through a reinforced concrete beam plate frame structure; the assembled steel support adopts H-shaped steel or steel pipes; a steel angle support and a steel opposite support are arranged in a regular foundation pit formed by the steel supports; the steel diagonal braces are connected into an integral steel support structure through an H-shaped steel transverse tie rod; the steel angle braces are connected into an integral steel brace through an H-shaped steel oblique tie rod; the steel support is vertically provided with a steel upright post; the steel support is connected with a supporting pile crown beam or an enclosing purlin through a steel triangular grid piece. The utility model discloses whole engineering time limit for a project is short, and the construction site is spacious, and the material transportation with stack the convenience, guaranteed efficiency of construction and safety better, reach the purpose of practicing thrift the cost simultaneously.

Description

Irregular foundation pit assembled steel strutting arrangement
Technical Field
The utility model relates to an underground space development midcourt ground hole exists irregular area's excavation supporting engineering field, specifically is a be applied to assembled steel strutting arrangement of underground space excavation irregular excavation supporting engineering.
Background
With the development of urban construction, available land in urban areas is less and less, and construction site conditions are also worse and worse. The development of underground space needs to be carried out in a place with a complex shape and extremely irregular, so that the problem of irregular foundation pit excavation exists. The irregular foundation pit is complex in stress, the inner support is difficult to arrange, and particularly, the application of the fabricated steel support is limited because the stress requirement of the steel support is simple to support, balance and stress level. Therefore, a method for arranging an assembly type steel support in an irregular foundation pit is needed to solve the above problems.
Patent document No. CN101666095A discloses a method for constructing an irregular foundation pit, which is characterized in that the inner support adopts a mode that a girt beam is supported on an arched beam, the arched beam is arranged in the irregular foundation pit, and the arched beam is provided with a cross beam to strengthen the transverse rigidity. The utility model discloses a structural style is succinct, and the atress route is clear and definite, and engineering cost is low, construction convenience, and supporting construction warp for a short time. The following disadvantages still remain: (1) the utility model adopts concrete beams for the inner support mining, and has slow construction speed and long maintenance time for large-area deep foundation pits, so that the construction period is too long; (2) the large-area concrete inner support is adopted in the foundation pit, the later-stage dismantling is difficult, and meanwhile, dust pollution and a large amount of concrete waste can be caused, so that the environment is polluted. (3) The inner support cannot be reused, and is not economical.
The patent document with the publication number of CN104790408A discloses a construction method of an irregular foundation pit, which is characterized in that a foundation pit top beam adopts double-spliced channel steel, a supporting pile adopts a mode of inserting profile steel into a triaxial mixing pile, an anchor rod is arranged on the outer side of the foundation pit, the length of the anchor rod inserted into foundation pit edge foundation soil is 14-20 m, and an inner support is prevented from being arranged inside the foundation pit. The following disadvantages remain: (1) the utility model adopts the form of anchor rod soil retaining, which leads the anchor rod to exceed the land red line and leaves an unpleasantable obstacle for the ground outside the pit, thus seriously affecting the construction of the subsequent engineering; (2) as for soft soil bodies such as silt, silt and the like, anchor rod supporting is adopted, and the resistance of the anchor rod side is too small, the foundation pit is excessively deformed, and the safety of the foundation pit environment is influenced.
Disclosure of Invention
In order to solve the deficiencies existing in the prior art, the utility model provides a carry out regularization with irregular foundation ditch and handle for whole engineering time limit for a project is short, and the construction site is spacious, and the material transportation is convenient with stacking, has guaranteed efficiency of construction and safety better, reaches an irregular foundation ditch assembled steel strutting arrangement and the construction application method of saving the purpose of cost simultaneously.
The purpose of the utility model is realized like this:
an irregular foundation pit assembly type steel support device comprises an irregular area processing structure and a foundation pit assembly type steel support, wherein the irregular area processing structure is used for processing by adopting a reinforced concrete frame structure;
the irregular area processing structure is a reinforced concrete frame structure, and the reinforced concrete frame structure adopts reinforced concrete cross beams and reinforced concrete slabs 2 to form a closed supporting structure with higher rigidity; the reinforced concrete longitudinal and transverse cross beam comprises a reinforced concrete beam plate frame 1 and a structure formed by connecting and fixing the reinforced concrete beam plate frame 1, and an irregular foundation pit is enclosed into a rectangular regular foundation pit;
the assembled steel support for the foundation pit comprises an assembled steel diagonal support structure and an assembled steel angle support structure;
the matched steel diagonal bracing structure is arranged in the middle of the foundation pit and comprises a steel upright post 8 and an assembly type steel diagonal bracing connection rod 4 connected with the steel upright post 8, and the assembly type steel diagonal bracing connection rod 4 is fixedly propped against the assembly type steel;
the assembly type steel pair brace connecting rod 4 is H-shaped steel or a steel pipe;
the assembly type steel corner brace structure is arranged at four corners of the foundation pit and comprises steel upright columns, an assembly type steel corner brace H-shaped steel transverse tie bar 6 fixedly connected with the steel upright columns, and an assembly type steel corner brace 5 fixedly connected with the assembly type steel corner brace H-shaped steel transverse tie bar 6; two ends of the assembled steel angle brace 5 are provided with steel triangular grid parts 7; the steel triangular mesh 7 consists of a plurality of regular triangular meshes 701; the steel support is connected with a supporting pile crown beam or an enclosing purlin through a steel triangular grid piece;
the steel upright column 8 is a square lattice column formed by welding 4L 140 or L160 equilateral angle steels 802 and steel batten plates 801, and an upright column pile 803 is arranged at the bottom;
the lower end of the assembly type steel pair brace connecting rod 4 is provided with a box type lifting box 401 which is connected through a high-strength bolt; one side of the box-type lifting box 401 is connected with the steel upright posts through at least 4 high-strength bolts while being welded.
Has the positive and beneficial effects that: the utility model solves the problem of difficult arrangement of the irregular deep foundation pit due to the adoption of the assembled steel support, and realizes the purposes of rapid construction and environmental protection of foundation pit engineering; the small-range adoption of the reinforced concrete frame structure in each irregular deep foundation pit area not only can enable the assembly type steel support arrangement area to form a regular rectangle, but also can enable the frame concrete area to be used as a small trestle, namely stacking construction appliances and the like; after the reinforced concrete frame structure is trimmed, a horizontal assembled steel supporting structure is arranged in a formed regular foundation pit, so that not only is the supporting cost saved, but also the foundation pit earthwork excavation of the tower is facilitated, and the construction period is saved; after the reinforced concrete frame structure is trimmed, the phenomenon that stress at the corner of the supporting structure is concentrated or local area deformation is prominent is avoided, the deformation of the supporting structure in the excavation process of the foundation pit is reduced, and the formed regular foundation pit ensures the uniformity of the deformation of the supporting structure; the assembled steel supports are used in a large area in the foundation pit, and can be disassembled and reused at the later stage, so that the requirements of energy conservation, environmental protection and green construction are met, and the assembled steel supports can be used in urban areas; the utility model discloses not only solved the foundation ditch sideline irregular, assembled steel shotcrete sets up the difficult problem, provides a large tracts of land deep basal pit construction method moreover. The method is simple and easy to implement, simple and reliable in process conversion and connection, capable of reducing the flow of constructors to the maximum extent and effectively improving the working efficiency, and has outstanding substantive characteristics and remarkable progress.
Drawings
FIG. 1 is a schematic plan view of an application method of an assembled steel support for irregular foundation pits according to the present invention;
FIG. 2 is a schematic cross-sectional view of a concrete frame beam;
FIG. 3 is a schematic view of an assembled steel support connection;
FIG. 4 is a schematic view of the connection between the H-shaped steel cross tie bar and the fabricated steel support;
FIG. 5 is a schematic view of a steel lattice column;
fig. 6 is a cross-sectional view of a steel triangular mesh.
In the figure, the following steps are carried out: the steel reinforced concrete frame beam comprises a reinforced concrete frame beam 1, a reinforced concrete slab 2, an assembled steel butt brace 3, an assembled steel butt brace H-shaped steel transverse tie bar 4, an assembled steel corner brace 5, an assembled steel corner brace H-shaped steel transverse tie bar 6, a steel triangular grid element 7 and a steel upright post 8.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
as shown in fig. 1 to 6, an irregular foundation pit fabricated steel bracing apparatus includes an irregular area treatment structure for treatment with a reinforced concrete frame structure, and a foundation pit fabricated steel bracing disposed in the irregular area treatment structure;
the irregular area processing structure is a reinforced concrete frame structure, and the reinforced concrete frame structure adopts reinforced concrete cross beams and reinforced concrete slabs 2 to form a closed supporting structure with higher rigidity; the reinforced concrete longitudinal and transverse cross beam comprises a reinforced concrete beam plate frame 1 and a structure formed by connecting and fixing the reinforced concrete beam plate frame 1, and an irregular foundation pit is enclosed into a rectangular regular foundation pit;
the assembled steel support for the foundation pit comprises an assembled steel diagonal support structure and an assembled steel angle support structure;
the matched steel diagonal bracing structure is arranged in the middle of the foundation pit and comprises a steel upright post 8 and an assembly type steel diagonal bracing connection rod 4 connected with the steel upright post 8, and the assembly type steel diagonal bracing connection rod 4 is fixedly propped against the assembly type steel;
the assembly type steel pair brace connecting rod 4 is H-shaped steel or a steel pipe;
the assembly type steel corner brace structure is arranged at four corners of the foundation pit and comprises steel upright columns, an assembly type steel corner brace H-shaped steel transverse tie bar 6 fixedly connected with the steel upright columns, and an assembly type steel corner brace 5 fixedly connected with the assembly type steel corner brace H-shaped steel transverse tie bar 6; two ends of the assembled steel angle brace 5 are provided with steel triangular grid parts 7; the steel triangular mesh 7 consists of a plurality of regular triangular meshes 701; the steel support is connected with a supporting pile crown beam or an enclosing purlin through a steel triangular grid piece;
the steel upright column 8 is a square lattice column formed by welding 4L 140 or L160 equilateral angle steels 802 and steel batten plates 801, and an upright column pile 803 is arranged at the bottom;
the lower end of the assembly type steel pair brace connecting rod 4 is provided with a box type lifting box 401 which is connected through a high-strength bolt; one side of the box-type lifting box 401 is connected with the steel upright posts through at least 4 high-strength bolts while being welded.
Examples
Taking a G20 project of a certain city as an example, the project belongs to a large-area deep foundation pit, and the outer side line of the basement is extremely irregular to form an irregular deep foundation pit. In order to meet the requirements of environmental protection and construction period, the inner support irregular area of the deep foundation pit adopts a reinforced concrete frame, an assembled steel support form is adopted after treatment, and the concrete construction steps of the foundation pit are as follows:
firstly, section division is carried out according to the sidelines of the foundation pit engineering, the form of each section of supporting pile and water-stop pile is determined, and then construction of the supporting pile and the water-stop pile is carried out. After the construction of the support piles and the water stop piles is finished, the positions and the spans of the reinforced concrete frame beams 1 are set according to the size of the area of the irregular area of the foundation pit, the space between the reinforced concrete frame beams is not more than 9.0m, the reinforced concrete slabs 2 are set according to the later stage trestle loading requirement, and the thickness of the reinforced concrete slabs is not less than 250 mm. After the position of the reinforced concrete frame beam is determined, constructing a steel upright 8 and an upright pile 803, wherein the upright pile adopts a cast-in-situ bored pile, the diameter of the pile is not less than 800mm, the length of the pile is determined according to the load, and the steel upright adopts a square lattice column formed by welding 4L 140 or L160 equilateral angle steels 802 and steel batten plates 801.
The method comprises the steps of firstly, constructing an assembled steel counter-bracing H-shaped steel transverse tie bar 4, arranging a box-type supporting box 401 at the lower end of the steel counter-bracing H-shaped steel transverse tie bar, welding 3 steel plates of-400 × 400 × 20 to form the box-type supporting box, welding one side of the box-type supporting box and the steel upright post, and simultaneously adopting not less than 4 Ø 28 high-strength bolts for connection, and simultaneously adopting not less than 2 Ø 28 high-strength bolts for connection between the upper end of the box-type supporting box and the H-shaped steel transverse tie bar.
After the construction of the transverse tie bar of the H-shaped steel of the steel diagonal brace is finished, erecting an assembly type steel diagonal brace 3, wherein the steel diagonal brace adopts H350 × 350-shaped steel, the length of the steel diagonal brace adopts 3 moduli of 9m, 1m and 2m, splicing and mounting are carried out, splicing of every two H-shaped steel diagonal braces is connected through a welding seam, meanwhile, two sides of a web plate of the H-shaped steel are respectively provided with a reinforced steel plate 301 of-700 × 300 × 20, the reinforced steel plate is connected with the H-shaped steel through a high-strength bolt 302 of Ø 28, and the lower end of the steel diagonal brace is connected with the transverse tie bar of the H-shaped steel through welding and is connected through no less than 2 high-strength bolts Ø 28.
And after the construction of the assembled steel diagonal brace and the H-shaped steel transverse connecting rod is finished, the construction of the assembled corner brace 5 and the H-shaped steel corner brace transverse connecting rod 6 is carried out. The construction method is consistent with the construction method of the assembled steel counter-bracing and H-shaped steel transverse tie rod.
And after the erection construction of the assembly type steel diagonal brace and the assembly type steel corner brace is finished, the connection with the crown beam or the surrounding purlin is carried out, wherein the two are connected with the crown beam and the surrounding purlin through the steel triangular piece 7. The steel diagonal brace and the steel angle brace are connected with the steel triangle through welding and a steel plate reinforcing mode. The other end of the steel triangle is connected with the crown beam and the surrounding purlin through the embedded steel plate;
the earth excavation and precipitation of the foundation pit engineering are consistent with those of the traditional foundation pit construction method; the construction method of all the subsequent inner supports is the same as that of the inner support in the first layer.
The utility model solves the problem of difficult arrangement of the irregular deep foundation pit due to the adoption of the assembled steel support, and realizes the purposes of rapid construction and environmental protection of foundation pit engineering; the small-range adoption of the reinforced concrete frame structure in each irregular deep foundation pit area not only can enable the assembly type steel support arrangement area to form a regular rectangle, but also can enable the frame concrete area to be used as a small trestle, namely stacking construction appliances and the like; after the reinforced concrete frame structure is trimmed, a horizontal assembled steel supporting structure is arranged in a formed regular foundation pit, so that not only is the supporting cost saved, but also the foundation pit earthwork excavation of the tower is facilitated, and the construction period is saved; after the reinforced concrete frame structure is trimmed, the phenomenon that stress at the corner of the supporting structure is concentrated or local area deformation is prominent is avoided, the deformation of the supporting structure in the excavation process of the foundation pit is reduced, and the formed regular foundation pit ensures the uniformity of the deformation of the supporting structure; the assembled steel supports are used in a large area in the foundation pit, and can be disassembled and reused at the later stage, so that the requirements of energy conservation, environmental protection and green construction are met, and the assembled steel supports can be used in urban areas; the utility model discloses not only solved the foundation ditch sideline irregular, assembled steel shotcrete sets up the difficult problem, provides a large tracts of land deep basal pit construction method moreover. The method is simple and easy to implement, simple and reliable in process conversion and connection, capable of reducing the flow of constructors to the maximum extent and effectively improving the working efficiency, and has outstanding substantive characteristics and remarkable progress.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (8)

1. The utility model provides an irregular foundation ditch assembled steel strutting arrangement which characterized in that: the method comprises an irregular area processing structure used for processing by adopting a reinforced concrete frame structure and a foundation pit assembled steel support arranged in the irregular area processing structure.
2. The irregular foundation pit assembled steel supporting device of claim 1, wherein: the irregular area processing structure is a reinforced concrete frame structure, and the reinforced concrete frame structure adopts reinforced concrete cross beams and reinforced concrete slabs to form a closed supporting structure with higher rigidity; the reinforced concrete criss-cross beam comprises a reinforced concrete beam plate frame, and the reinforced concrete beam plate frame is connected and fixed to form a structure which encloses the irregular foundation pit into a rectangular regular foundation pit.
3. The irregular foundation pit assembled steel supporting device of claim 1, wherein: the assembled steel support for the foundation pit comprises an assembled steel diagonal bracing structure and an assembled steel angle bracing structure.
4. The irregular foundation pit assembled steel supporting device of claim 3, wherein: the matched steel diagonal bracing structure is arranged in the middle of the foundation pit and comprises a steel upright post and an assembly steel diagonal bracing connecting rod connected with the steel upright post, and the assembly steel diagonal bracing connecting rod is fixed with the assembly steel diagonal bracing.
5. The irregular foundation pit assembled steel supporting device of claim 4, wherein: the assembly type steel counter-bracing tie rod is H-shaped steel or a steel pipe.
6. The irregular foundation pit assembled steel supporting device of claim 3, wherein: the assembled steel corner brace structure is arranged at four corners of the foundation pit and comprises steel upright posts, assembled steel corner brace H-shaped steel transverse connecting rods fixedly connected with the steel upright posts and assembled steel corner braces fixedly connected with the assembled steel corner brace H-shaped steel transverse connecting rods; two ends of the assembled steel angle brace are provided with steel triangular grid parts; the steel triangular mesh part consists of a plurality of regular triangular meshes; the steel support is connected with a supporting pile crown beam or an enclosing purlin through a steel triangular grid piece.
7. The irregular foundation pit assembled steel supporting device of claim 4, wherein: the steel stand be the square lattice column that adopts 4L 140 or L160 equilateral angle steel plus steel lacing plate welding to form, the bottom is provided with the stand stake.
8. The irregular foundation pit assembled steel supporting device of claim 7, wherein: the lower end of the assembly type steel counter-bracing tie rod is provided with a box-shaped supporting box which is connected through a high-strength bolt; one side of the box-type lifting box is connected with the steel upright posts through at least 4 high-strength bolts while being welded.
CN201921394546.4U 2019-08-27 2019-08-27 Irregular foundation pit assembled steel strutting arrangement Active CN210887229U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921394546.4U CN210887229U (en) 2019-08-27 2019-08-27 Irregular foundation pit assembled steel strutting arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921394546.4U CN210887229U (en) 2019-08-27 2019-08-27 Irregular foundation pit assembled steel strutting arrangement

Publications (1)

Publication Number Publication Date
CN210887229U true CN210887229U (en) 2020-06-30

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Application Number Title Priority Date Filing Date
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