CN214573978U - Deep foundation pit protection structure next to high-rise building - Google Patents

Abstract

The utility model discloses a deep basal pit protective structure of next-door neighbour high-rise building thing, including set up in the envelope in the deep basal pit outside, set up in the lattice column of deep basal pit central point position, set up in the concrete support at deep basal pit top, it still includes: the steel pipe pile comprises a small-diameter steel pipe pile arranged between a building foundation and an enclosure structure, a pile top crown beam arranged at the top of the small-diameter steel pipe pile, a foundation reinforcing pile, a steel pipe concrete column arranged at the center of a deep foundation pit, a structural plate, a cross brace arranged between the steel pipe concrete column and a lattice column, and a connecting beam for connecting the steel pipe concrete column and the lattice column in series into a whole. The utility model discloses can improve deep basal pit's the ability of strutting, can effectively guarantee the side and lean on the safety of the high-rise building thing of foundation ditch enclosure wall to prevent that the high-rise building thing from taking place to subside, arousing structural deformation, crack, the building scheduling problem that collapses appears even.

Description

Deep foundation pit protection structure next to high-rise building

Technical Field

The utility model relates to a side is by deep foundation pit building's foundation stabilization's technical field, concretely relates to next-door neighbour high-rise building's deep basal pit protective structure.

Background

With the continuous acceleration of urbanization process in China, deep foundation pit engineering in cities is increasing day by day. The project that a newly-built deep foundation pit is close to a high-rise building is gradually increased, dynamic interaction is inevitably generated between the deep foundation pit and the building in the construction process, and when the existing enclosure structure is difficult to meet the side pressure requirement of the surrounding building due to climate, geology, time effect and the like of the deep foundation pit, the building is settled, the structural deformation and cracks are caused, and even the building collapses and the like.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a deep basal pit protective structure of next-door neighbour high-rise building thing, it can improve deep basal pit's supporting ability, can effectively guarantee the side and lean on the safety of the high-rise building thing of foundation ditch enclosure wall to prevent that the high-rise building thing from taking place to subside, arousing structural deformation, crack, the building scheduling problem that collapses appears even.

In order to achieve the above object, the present invention provides the following technical solutions.

The deep basal pit protective structure of next-door neighbour high-rise building, including setting up in the envelope in the deep basal pit outside, setting up in the lattice column of deep basal pit central point position, set up in the concrete support at deep basal pit top, it still includes:

the steel pipe pile is arranged between a building foundation and a building enclosure, the pile top crown beam is arranged at the top of the steel pipe pile, the foundation reinforcing pile, the steel pipe concrete column is arranged at the center of a deep foundation pit, the structural plate, the cross brace is arranged between the steel pipe concrete column and the lattice column, and the steel pipe concrete column and the lattice column are connected in series to form an integral connecting beam; the foundation reinforcing pile is arranged towards the right lower part of the building by taking the ground between the steel pipe pile and the building as a starting point and an oblique angle of 30-60 degrees; the structural plate is arranged at the top of the deep foundation pit and is connected with the steel pipe concrete column, the enclosure structure and the lattice column;

in the structure, the pile top crown beam is arranged at the top of the steel pipe pile, so that the single-pile steel pipe pile can be constrained into an integral stress structure, and the single-pile stress is converted into pile group stress when the steel pipe pile is subjected to lateral force; when the steel pipe pile is subjected to lateral force, the pile top crown beam and the pile top bedrock section respectively play a role of a support, so that a cantilever structure is changed into a simple structure, the shearing resistance of the pile body is greatly improved, and the lateral sliding resistance of the pile body is further improved; the foundation reinforcing piles can reduce disturbance to an undisturbed soil body at the bottom of the foundation, and avoid the change of a stressed stable state of the soil body and overlarge strength loss, thereby influencing the bearing capacity of the building foundation; the steel pipe concrete column is arranged at the center of the deep foundation pit and anchored into the bedrock to ensure the vertical bearing capacity of the single pile, so that a support and vertical supporting force are provided for the structural slab, the span of the structural slab can be reduced, and the stability of the structural slab can be improved; the top of the deep foundation pit is provided with the structural plate, so that a plurality of horizontal supporting functions can be realized, a great horizontal supporting force is provided for the enclosure structure, the lateral deformation resistance of the enclosure structure in the foundation pit is improved, and the steel pipe concrete column, the enclosure structure in the deep foundation pit and the lattice column are connected into a whole; the independent supporting structure forms a supporting system by the arrangement of the cross braces and the connecting beams, and the deformation resistance of the supporting system is greatly improved.

As a specific technical scheme, the distance between the outer side of the steel pipe pile and the enclosure structure at the outer side of the deep foundation pit is not less than 50 cm; the length of the steel pipe pile anchored into the bottom of the adjacent foundation pit is not less than 1 m; the pile spacing and the row spacing of the steel pipe piles are 2-3 times of the diameter of the piles, and the steel pipe piles are arranged in a quincunx mode.

According to the specific technical scheme, the top of the steel pipe in the steel pipe pile is exposed out of the beam surface of the pile top crown beam by 50-100 mm.

According to the specific technical scheme, the diameter d of the steel pipe used in the steel pipe pile is greater than or equal to 95mm and smaller than or equal to 127mm, and the wall thickness of the steel pipe is not less than 8 mm.

As a specific technical scheme, when the depth of the deep foundation pit exceeds 20m, the number of the arranged rows of the steel pipe piles is not less than 3, and when the depth of the deep foundation pit is less than 20m, the number of the rows of the steel pipe piles is not less than 2.

As a specific technical scheme, the position of the foundation reinforcing pile at the ground starting point is not less than 1m and not more than 2m away from the building.

As a specific technical scheme, the steel pipe concrete column consists of a permanent pile and a temporary steel pipe column anchored in the permanent pile; the length of the temporary steel pipe column anchored into the permanent pile is not less than 4m, the outer wall of the anchoring section of the temporary steel pipe column is provided with studs, and the periphery of the temporary steel pipe column is backfilled with a water-permeable dense material.

Specifically, the diameter of the temporary steel pipe column is more than or equal to 600mm and less than or equal to 800 mm.

As a specific technical scheme, the cross brace is made of I-shaped steel.

The utility model discloses beneficial effect:

the utility model discloses to the condition that appears subsiding a little near the building in the deep basal pit work progress, adopt steel-pipe pile, ground reinforcing pile, consolidate the peripheral soil body of building foundation, improve bulk strength, roof reverse-operation in the combination foundation ditch, multiple support system, promote the interior supporting capability of foundation ditch, reduce the building and subside, prevent fracture and slope, when practicing thrift engineering cost, still green, it is little and improved deep basal pit excavation efficiency to occupy the place, effectively guaranteed building safety.

Drawings

Fig. 1 is a schematic structural view of the deep foundation pit protection structure of the present invention;

FIG. 2 is a connection diagram of a concrete filled steel tube column and a lattice column according to the present invention;

FIG. 3 is an enlarged schematic view at A in FIG. 1;

the meanings of the marks in the above figures are as follows: 1-steel pipe pile, 2-pile top crown beam, 3-foundation reinforced pile, 4-steel pipe concrete column, 401-permanent pile, 402-temporary steel pipe column, 5-structural plate, 6-concrete support, 7-crown beam, 8-enclosure structure, 9-lattice column, 10-building foundation, 11-deep foundation pit, 12-building, 13-shear brace and 14-connecting beam.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

Referring to fig. 1 to 3, the deep foundation pit protection structure is close to a deep foundation pit protection structure of a high-rise building, and comprises an enclosure structure 8 arranged outside a deep foundation pit 11, a lattice column 9 arranged at the center of the deep foundation pit 11, a concrete support 6 arranged at the top of the deep foundation pit 11, a steel pipe pile 1 arranged between a building foundation 10 and the enclosure structure 8, a pile top crown beam 2 arranged at the top of the steel pipe pile 1, a foundation reinforcing pile 3, a steel pipe concrete column 4 arranged at the center of the deep foundation pit 11, a structural plate 5, a shear brace 13 arranged between the steel pipe concrete column 4 and the lattice column 9, and a tie beam 14 for connecting the steel pipe concrete column 4 and the lattice column 9 into a whole in series; wherein, the foundation reinforcing pile 3 is arranged towards the right lower part of the building 12 by taking the ground between the steel pipe pile 1 and the building 12 as a starting point and by an oblique angle of 30-60 degrees; the structural plate 5 is arranged at the top of the deep foundation pit 11 and is connected with the steel pipe concrete column 4, the enclosure structure 8 and the lattice column 9.

Further, in a preferred embodiment, the distance between the outer side of the steel pipe pile 1 and the building enclosure 8 at the outer side of the deep foundation pit 11 is not less than 50 cm; the length of the steel pipe pile 1 anchored into the bottom of the adjacent foundation pit is not less than 1 m; the pile spacing and the row spacing of the steel pipe piles 1 are 2-3 times of the diameter of the piles, and the steel pipe piles are arranged in a quincunx mode.

Further, in a preferred embodiment, the beam surface of the pile top crown beam 2 exposed out of the steel pipe top in the steel pipe pile 1 is 50-100 mm.

Further, in a preferred embodiment, the diameter d of the steel pipe used in the steel pipe pile 1 is 95mm or more and 127mm or less, and the wall thickness of the steel pipe used is not less than 8 mm.

Further, in a preferred embodiment, when the depth of the deep foundation pit 11 exceeds 20m, the number of the arranged rows of the steel pipe piles 1 is not less than 3, and when the depth of the deep foundation pit 11 is less than 20m, the number of the arranged rows of the steel pipe piles is not less than 2.

Further, in a preferred embodiment, the position of the foundation reinforcing pile 3 from the ground starting point is not less than 1m and not more than 2m from the building 12.

Further, in a preferred embodiment, the steel core concrete column 4 is composed of a permanent pile 401 and a temporary steel core column 402 anchored into the permanent pile 401; the length of the temporary steel pipe column 402 anchored into the permanent pile 401 is not less than 4m, the outer wall of the anchoring section of the temporary steel pipe column 402 is provided with studs, and the periphery of the temporary steel pipe column 402 is filled with a water-permeable compact material.

Further, in a preferred embodiment, the temporary steel pipe column 402 has a diameter of 600mm or more and 800mm or less.

Further, in a preferred embodiment, I-shaped steel is used for the cross-braces 13.

Example 2

The construction method of the deep foundation pit protection structure adjacent to the high-rise building comprises the following steps:

s1 construction of steel pipe pile

Before the excavation of the deep foundation pit, a steel pipe pile 1 is constructed between a building foundation 10 and a building enclosure 8 on the outer side of the foundation pit, and the method specifically comprises the following steps:

1) carrying out site cleaning, pipeline investigation, building an operation platform and measuring the position of a pile position;

2) drill in-place pore-forming and pore-cleaning in hole

Wherein, the drilling machine is connected with a drill rod once every 2m of footage, and bentonite slurry is adopted to protect the wall, so as to prevent hole collapse; the distance between the outer side of the steel pipe pile 1 and the enclosure structure is not less than 50cm, so that the integrity of a flexible soil body is guaranteed, and the disturbance of foundation pit excavation to a building foundation is reduced;

3) hoisting steel pipe pile

When the depth of the foundation pit exceeds 20m, the number of rows of the steel pipe piles is not less than 3, and when the depth of the foundation pit is less than 20m, the number of rows of the steel pipe piles is not less than 2; the steel pipe pile adopts the technology of 'segmenting, jumping rows and jumping piles at intervals'; the diameter d of the steel pipe is more than or equal to 95mm and less than or equal to 127mm, and the wall thickness is not less than 8 mm; the pile spacing and the row spacing of the steel pipe piles are 2.5 times of the diameter d of the piles, and the steel pipe piles are arranged in a quincunx manner; the length of the steel pipe pile anchored into the bottom of the adjacent foundation pit is not less than 1m, so that the anchoring force and the stability of the pile body are ensured; arranging grouting holes in a quincunx shape at an anchoring section of 2-5 m at the bottom of the steel pipe pile, selecting cement-water glass double-grout as grout, and calculating diffusion radius of the grout and the distance between piles;

4) pouring double slurry to the upper opening for turning slurry

The top surface of the steel pipe top of the steel pipe pile is exposed out of the top surface of the pile top crown beam 2 by 50-100 mm so as to be convenient for connecting a grouting pipe; grouting pressure is 0.6-1.0 Mpa, diffusion radius is 0.25m, and water-cement ratio is controlled between 0.6: 1-1: 1; grouting is carried out in a mode of multiple gaps, the average time is 3-5 times, and the standard of finishing grouting is pipe top slurry leakage;

s2 construction of pile top crown beam

Constructing a pile top crown beam 2 at the top of the steel pipe pile 1, and constraining the single-pile steel pipe pile 1 into an integral stress structure, which comprises the following steps:

1) survey lofting

2) Pile head for manually removing steel pipe pile

Before the construction of the pile top crown beam, pile head removing operation can be carried out when the strength of cement paste in the steel pipe pile 1 reaches more than 30Mpa, and the steel pipe top of the steel pipe pile 1 is controlled to be exposed out of the top surface of the pile top crown beam 2 by 50-100 mm for later-stage secondary grouting;

3) pouring concrete cushion layer

4) Masonry brick moulding bed

5) Plastering with cement mortar

6) Binding of reinforcing steel bars

L-shaped steel bars are welded on the upper surface and the lower surface of the outer wall of a steel pipe in the steel pipe pile 1, and the L-shaped steel bars are welded in contact with main bars of a pile top crown beam 2, so that the effective connection and the stable stress of the steel pipe pile and the crown beam are ensured;

7) pouring of concrete

The pile top crown beam 2 and the crown beam 7 are controlled to have the same elevation and the same thickness and are connected into a whole through embedded steel bars so as to improve the lateral force resistance;

8) maintaining

S3 sleeve valve pipe compensation grouting construction

Adopt sleeve valve pipe compensation slip casting construction foundation reinforcing pile 3, specifically include the following step:

1) measuring the hole position

Wherein, the initial position of the drilling is not less than 1m and not more than 2m away from the building 12, thus after the foundation reinforcing pile 3 is formed by sleeve valve pipe compensation grouting construction, the position (namely pile head position) of the ground initial point of the foundation reinforcing pile 3 is not less than 1m and not more than 2m away from the building 12.

2) Drill in place

3) Oblique hole forming

Between the steel pipe pile 1 and the building 12, 5 rows of construction are carried out

Sleeve valve pipes are arranged in a quincunx mode, the distance between every two sleeve valve pipes is 1.0m, the row spacing is 0.5m, and the grouting pipes are PVC pipes provided with grouting holes with the diameter of 6 mm; after the hole position is determined, the drilling machine enters the field and is in place, and holes are drilled at the bottom of the building 12 towards the position right below the building 12 at an oblique angle of 30-60 degrees so as to avoid the building foundation 10;

4) injecting jacket shell material

The water-cement ratio of the slurry is 1:1, and the grouting range is 1m below the residual sandy cohesive soil (hard plastic); after the casing material replaces the mud in the hole, the casing material is immediately inserted into the sleeve valve pipe, and the upper part of the casing material is 20cm higher than the ground; curing the shell material for 5-7 days, and grouting after the strength reaches 0.3-0.5 MPa;

5) down-sleeve valve pipe

6) Grouting

S4 construction of concrete filled steel tubular column

The method is characterized in that the concrete-filled steel tubular column 4 is constructed in the center of the deep foundation pit 11, and the method specifically comprises the following steps:

1) pile position lofting

The longitudinal spacing of the steel pipe concrete columns 4 is equal to the supporting spacing of foundation pit concrete, and the steel pipe concrete columns 4 are arranged at the central position (the position of one-half of the width of the foundation pit) of the deep foundation pit 11 so as to provide a support and vertical supporting force for the structural slab, reduce the span of the structural slab and improve the stability of the structural slab;

2) embedding a pile casing;

measuring the pile position by using a total station, excavating a pile casing hole, and adopting a steel pile casing with the diameter of more than 1.5 m;

3) drill in-place drilling

4) Cleaning the hole after the hole is formed

5) Inspection of pore formation

6) Drill shifting

7) Hoisting steel pipe column

The aperture needs to be rechecked before hoisting, the pile position tolerance deviation is not more than 50mm, and the pile body verticality deviation is not more than 1/300; the steel pipe concrete column 4 consists of a permanent pile and a temporary steel pipe column anchored in the permanent pile; the diameter of the permanent pile is more than or equal to that of a surrounding wall or a pile in the enclosure structure 8, the anchoring depth and the concrete grade of the base of the permanent pile are the same as those of the surrounding wall or the pile in the enclosure structure 8, the anchoring length of the temporary steel pipe column into the permanent pile is not less than 4m, the outer wall of the anchoring section of the temporary steel pipe column is provided with studs, the length of the studs is 100mm, the distance between the studs is 150mm, and each section is not less than 12;

8) down-placing conduit

9) Pouring concrete

Pouring underwater concrete, and marking the same number as the enclosure wall or pile in the enclosure structure 8;

10) removal of a catheter

11) Initial setting of pile foundation for fixing steel pipe column

12) Cast-in-place steel pipe column concrete

A hidden beam is additionally arranged on the structural slab to connect the lattice column and the steel pipe concrete column; the steel tube concrete column and the hidden beam bottom main rib are connected by adopting an annular rigid plate, the steel reinforcement cage is connected with the steel tube concrete column and the hidden beam top main rib, the steel reinforcement cage is inserted into the steel tube concrete column and is not less than 1200mm, and the anchoring length of the steel reinforcement cage and the hidden beam top main rib is not less than 400 mm; filling water-permeable dense materials such as gravel, sand and the like around the pile of the temporary steel pipe column;

s5, construction of structural slab

The construction method comprises the following steps of constructing a structural slab 5 at the top of the deep foundation pit 11 to connect the concrete-filled steel tubular column 4 with an enclosure structure 8 and a lattice column 9 in the deep foundation pit 11 to form a whole, and specifically comprising the following steps:

1) excavating earth to the bottom of the top plate

2) Chiseling diaphragm wall

Before construction, chiseling part of enclosure walls or piles, wherein the depth is 300mm, and the height is equal to the thickness of a structural plate; when chiseling, I-shaped steel at the joint is reserved, concrete in the I-shaped steel is removed completely, and L-shaped steel bars and the I-shaped steel are welded on two sides;

3) bar planting

Chiseling off the underground diaphragm wall part for bar planting construction, adopting an electric hammer to form a hole, and drilling the hole with the aperture d + 4-8 mm (d is the diameter of a steel bar); two rows of anchoring ribs are implanted into the enclosure wall or the pile from top to bottom, the diameter of each anchoring rib is the same as that of a transverse main rib of the structural slab, the length of each anchoring rib is not less than 300mm, and the anchoring ribs are connected with the main ribs of the structural slab in a single-sided welding manner; the reinforcing steel bar planting in the horizontal hole is carried out by tamping the glue in the hole by using a phi 6 thin reinforcing steel bar matched with a glue supporting plate (a clean wood plate), and the reinforcing steel bar is driven into the hole by adopting a rotating or hand hammer striking mode;

4) excavation downward turning beam and side wall groove

5) Pouring concrete cushion layer

6) Brick mould for building downward turning beam and side wall

The length of a single structural slab is not less than 18m and not more than 25m, the number of the structural slabs is set according to the length of the deep foundation pit 11 adjacent to the building, and when the length of the deep foundation pit 11 adjacent to the building is more than 54m, the structural slab is constructed by adopting a hop method, the hop part of the structural slab is constructed by adopting a forward construction method, the other part of the structural slab is constructed by adopting a reverse construction method, and a hidden beam is additionally arranged in the structural slab constructed by the reverse construction method, wraps and connects the steel pipe concrete column 4 and the lattice column 9;

7) waterproof construction

Grouting pipes are respectively embedded above and below the positions where the top plate penetrates into the building envelopes at two sides by 300mm and the height of the top plate is 800mm, and cement-based permeable crystallization type waterproof materials are applied to the positions which are in contact with the building envelopes; the full-section pre-buried steel plate water stop belts of the structural plates and the side walls, the grouting pipes capable of grouting the brand-new sections and the steel bar connectors;

8) binding top plate steel bar

9) Mounting end die

10) Pouring concrete

11) Maintaining

S6 construction of support system

And (3) constructing a concrete support 6 in the deep foundation pit 11 in a layering manner, and arranging a cross brace 13 and a connecting beam 14 between the steel pipe concrete column 4 and the lattice column 9 to enable the independent support structure to form a support system.

Claims (9)

1. Deep basal pit protective structure of next-door neighbour high-rise building, including setting up in envelope (8) in deep basal pit (11) outside, setting up in lattice column (9) that deep basal pit (11) central point put, set up in concrete support (6) at deep basal pit (11) top, its characterized in that still includes:

the steel pipe pile structure comprises a steel pipe pile (1) arranged between a building foundation (10) and a building enclosure (8), a pile top crown beam (2) arranged at the top of the steel pipe pile (1), a foundation reinforcing pile (3), a steel pipe concrete column (4) arranged at the center of a deep foundation pit (11), a structural plate (5), a cross brace (13) arranged between the steel pipe concrete column (4) and a lattice column (9), and a connecting beam (14) for connecting the steel pipe concrete column (4) and the lattice column (9) into a whole in series; the foundation reinforcing pile (3) is arranged towards the right lower part of the building (12) by taking the ground between the steel pipe pile (1) and the building (12) as a starting point and an oblique angle of 30-60 degrees; the structural plate (5) is arranged at the top of the deep foundation pit (11) and is connected with the steel pipe concrete column (4), the enclosure structure (8) and the lattice column (9).

2. The deep foundation pit protection structure adjacent to a high-rise building as claimed in claim 1, wherein the distance from the outside of the steel pipe pile (1) to the enclosure (8) outside the deep foundation pit (11) is not less than 50 cm; the pile length of the steel pipe pile (1) is anchored into the bottom of the adjacent foundation pit by not less than 1 m; the pile spacing and the row spacing of the steel pipe piles (1) are 2-3 times of the diameter of the piles, and the steel pipe piles are arranged in a quincunx mode.

3. The deep foundation pit protection structure adjacent to a high-rise building as claimed in claim 1, wherein the top of the steel pipe in the steel pipe pile (1) is exposed to the beam surface of the pile top crown beam (2) by 50-100 mm.

4. The deep foundation pit protection structure adjacent to a high-rise building as claimed in claim 1, wherein the diameter d of the steel pipe used in the steel pipe pile (1) is not less than 95mm and not more than 127mm, and the wall thickness of the steel pipe used is not less than 8 mm.

5. The deep foundation pit guarding structure adjacent to a high-rise building as claimed in claim 1, wherein the number of the rows of the steel pipe piles (1) is not less than 3 when the depth of the deep foundation pit (11) exceeds 20m, and not less than 2 when the depth of the deep foundation pit (11) is less than 20 m.

6. The deep foundation pit protection structure adjacent to a high-rise building as claimed in claim 1, wherein the position of the foundation reinforcing pile (3) from the ground starting point is not less than 1m, not more than 2m from the building (12).

7. The deep foundation pit protection structure in the immediate vicinity of a high-rise building as claimed in claim 1, wherein said steel reinforced concrete column (4) is composed of a permanent pile (401) and a temporary steel pipe column (402) anchored into the permanent pile (401); the length of the temporary steel pipe column (402) anchored into the permanent pile (401) is not less than 4m, the outer wall of the anchoring section of the temporary steel pipe column (402) is provided with a stud, and the periphery of the temporary steel pipe column (402) is filled with a water-permeable compact material.

8. The deep foundation pit guarding structure next to a high-rise building according to claim 7, wherein the diameter of the temporary steel pipe column (402) is 600mm or more and 800mm or less.

9. The deep foundation pit protection structure next to a high-rise building as claimed in any one of claims 1 to 8, wherein said shear braces (13) are I-type I-shaped steel.

Images