CN216865190U

CN216865190U - Compound supporting construction

Info

Publication number: CN216865190U
Application number: CN202220580220.6U
Authority: CN
Inventors: 杨信强; 吴嘉希; 焦勇; 孙素凤; 裴少元; 张雷刚; 胡越; 张震; 褚金栋; 刘小波; 张学忠; 汤乃奇; 白晋合; 程嘉庆; 陈以千
Original assignee: Zhongyan Technology Co Ltd; Beijing Construction Engineering Group Co Ltd
Current assignee: Zhongyan Technology Co Ltd; Beijing Construction Engineering Group Co Ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-07-01
Anticipated expiration: 2032-03-17

Abstract

The utility model discloses a composite supporting structure, which comprises a foundation pit, a slope protection arranged on the periphery of the foundation pit, a waterproof curtain connected to the slope foot of the slope protection, soil nails connected to the slope protection, a top enclosure assembly connected to the slope top of the slope protection, and core piles connected to the interior of the waterproof curtain; the bottom end of the core pile is higher than the bottom end of the waterproof curtain and is arranged within the length range of the waterproof curtain at intervals. According to the waterproof curtain, the waterproof curtain is formed by the stirring piles, the core piles are inserted into the stirring piles, so that the waterproof curtain is favorably reinforced, the length of each core pile is smaller than the height of the waterproof curtain, and the construction cost is saved while the strength is ensured; through the setting of bank protection and top enclosure subassembly, do benefit to and consolidate the design and carry out waterproof design to the top of the slope to the bank protection. By arranging the backfill layer, the lateral overturn resistance of the waterproof curtain is enhanced, and the soil property of the foundation is ensured; the integral connection between the waterproof curtain and the top of the core pile is enhanced by arranging the crown beam.

Description

Compound supporting construction

Technical Field

The utility model belongs to the technical field of foundation pit construction, and particularly relates to a composite supporting structure.

Background

In the foundation ditch construction, if meet unfavorable geology or ground water level too high, all can cause the foundation ditch construction difficulty, influence bottom bearing capacity. Generally, a single pile type or a treatment measure is mostly adopted in the foundation treatment under the condition, and the single pile type treatment mode has long construction period and inflexible disposal, so that the investment of manpower and cost is overlarge. From this need carry out compound and strut, and compound supporting construction pattern is various and need design according to the foundation ditch of different grade type, then more needs the scheme of pertinence to the higher and foundation ditch that need carry out the reinforcement of ground water level.

SUMMERY OF THE UTILITY MODEL

The utility model provides a composite supporting structure, which is used for solving the technical problems of arrangement of waterproof curtains and core piles for treating foundation with underground water, slope protection, waterproof design and the like.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a composite supporting structure comprises a foundation pit, a protective slope arranged on the periphery of the foundation pit, a waterproof curtain connected to the slope foot of the protective slope, soil nails connected to the protective slope, a top enclosure assembly connected to the top of the protective slope, and core piles connected to the inside of the waterproof curtain;

the bottom end of the core pile is higher than the bottom end of the waterproof curtain and is arranged at intervals within the length range of the waterproof curtain;

the bank protection extends to the subaerial top of top and encloses and protect subassembly department, and still is provided with at bank protection and top and encloses and protect subassembly junction and beat into formula earth anchor.

Further, the slope protection has a slope ratio of 1: 0.3, two soil nails are arranged, the thickness of the anchor spraying surface layer is not less than 100mm, and a reinforcing mesh is arranged in the anchor spraying surface layer.

Further, the top enclosure assembly comprises a guardrail connected to the top of the slope protection and a water interception platform connected between the guardrail and the top of the slope; the water intercepting platform is of a concrete structure and is integrally connected with the anchor spraying surface on the outer side of the revetment.

Furthermore, the waterproof curtain is a group of stirring piles, the stirring piles are in occlusion connection, the tops of the stirring piles exceed the tops of the aquifer, and the bottoms of the stirring piles are embedded into the waterproof layer; the axle center of the mixing pile is coincided with the axle center of the core pile.

Furthermore, the top of the core pile is also connected with crown beams, and anchor cables are vertically arranged at intervals; the bottom ends of the waterproof curtain and the core pile are lower than the bottom surface of a backfill layer at the designed bottom of the foundation pit, and the top of the waterproof curtain and the core pile are higher than the structural bottom plate.

Furthermore, the anchor cable is provided with at least one channel, and the included angle between the anchor cable and the horizontal plane is 15 degrees.

Further, the core pile is a tubular pile, a solid cylindrical pile or a profile steel pile, the top of the core pile is fixedly connected with the crown beam, and the top of the core pile extends into the crown beam.

Furthermore, the top beam is connected with an anchor cable, the cross section of the top beam is in a right trapezoid shape, the bevel edge faces one side of the foundation pit, and the angle of the bevel edge corresponds to that of the anchor cable.

The utility model has the beneficial effects that:

1) according to the waterproof curtain, the waterproof curtain is formed by the stirring piles, the core piles are inserted into the stirring piles, so that the waterproof curtain is favorably reinforced, the length of each core pile is smaller than the height of the waterproof curtain, and the construction cost is saved while the strength is ensured;

2) according to the utility model, through the arrangement of the slope protection and the top enclosure assembly, the slope protection is favorably reinforced and the slope top is favorably designed to be waterproof;

3) according to the utility model, through the arrangement of the backfill layer, the lateral overturn resistance of the waterproof curtain is favorably enhanced, and the soil property of the foundation is ensured; the integral connection between the waterproof curtain and the top of the core pile is favorably strengthened through the arrangement of the crown beam;

additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model; the primary objects and other advantages of the utility model may be realized and attained by the instrumentalities particularly pointed out in the specification.

Drawings

Fig. 1 is a schematic structural view of a composite supporting structure;

fig. 2 is a partial schematic view of a composite supporting structure;

FIG. 3 is a top view of the waterproof curtain and core stakes.

Reference numerals: 1-foundation pit, 2-slope protection, 3-waterproof curtain, 4-core pile, 5-crown beam, 6-anchor cable, 7-backfill layer, 8-structural bottom plate, 9-top enclosure assembly, 91-guardrail, 92-water cut-off platform, 10-soil body, 11-driven ground anchor and 12-soil nail.

Detailed Description

Taking a project as an example, the whole land of the project is approximately quadrangular, the east-west length is about 758m, and the north-south width is about 850 m. The supporting design excavation depth of the foundation pit 1 is 6.1 m-12.7 m. The field is slightly fluctuated, the east is high, the west is low, the elevation around the ground is 24.30-32.00 m, and the elevation of the project +/-0.00 is the absolute elevation 27.8 m. The foundation pit 1 has an importance safety level of two levels, and the design service life is 1 year. The proposed site survey reveals that the surface layer is an artificial fill layer within the depth range of 65.00m, and a quaternary recently surging layer and a general quaternary surging sedimentary layer are arranged below the artificial fill layer.

In the embodiment, the excavation depth is 11.7-12.0m, the safety level of the foundation pit 1 is two levels, and a support form of a high-speed deep mixing composite pile DMC pile and a prestressed anchor cable 6 is adopted; the current state of the project ground is temporarily considered according to the building design-0.8027.000 m. Cement paste: the strength M20, the water cement ratio is 0.45-0.50, and the cement adopts PO 42.5; c25 is adopted for the concrete of the crown beam 5, and secondary grouting is adopted for anchor rods in the area; the core pile 4 is a prefabricated pipe pile, and the pipe pile is constructed in 6 hours of the construction of the triaxial mixing pile; ground overload <20kPa during construction; the width of the fertilizer groove is 1000 mm; a240 x200mm water-stopping table 92 is arranged at the top of the pit, a 300x300 drainage ditch is arranged at the bottom of the pit, and a water collecting well is arranged at the bottom of the pit every 30 m.

Referring to fig. 1 to 3, a composite supporting structure includes a foundation pit 1, a slope protection 2 disposed around the foundation pit 1, a waterproof curtain 3 connected to the toe of the slope protection 2, soil nails 12 connected to the slope protection 2, a top enclosure assembly 9 connected to the top of the slope protection 2, and core piles 4 connected to the waterproof curtain 3.

In the embodiment, the waterproof curtain 3 is a group of stirring piles, the stirring piles are in occlusion connection, the tops of the stirring piles exceed the tops of the aquifer and the backfill layer 7, and the bottoms of the stirring piles are embedded into the waterproof layer; (ii) a The axle center of the mixing pile coincides with the axle center of the core pile 4. The top of the core pile 4 is also connected with crown beams 5, anchor cables 6 are vertically arranged at intervals, and the anchor cables 6 are inserted into a soil body 10. The bottom ends of the waterproof curtain 3 and the core piles 4 are lower than the bottom surface of a designed bottom backfill layer 7 of the foundation pit 1, and the top parts of the waterproof curtain and the core piles are higher than a structural bottom plate 8. The bottom end of the core pile 4 is higher than the bottom end of the waterproof curtain 3 and is arranged at intervals in the length range of the waterproof curtain 3.

In this embodiment, at least three anchor cables 6 are provided, and an included angle between each anchor cable 6 and a horizontal plane is 15 °. The core pile 4 is a tubular pile, a solid cylindrical pile or a profile steel pile, the top of the core pile 4 is fixedly connected with the crown beam 5, and the top of the core pile 4 extends into the crown beam 5. An anchor cable 6 is connected to the top beam 5, the cross section of the top beam 5 is in a right trapezoid shape, the inclined edge faces one side of the foundation pit 1, and the inclined edge is correspondingly anchored in the angle to be connected with the anchor cable 6.

In the embodiment, a 23.0m long phi 850@600 triaxial mixing pile is arranged, a 15.0m long PRC600-130-C @1200 precast tubular pile is inserted, 3 anchor cables 66 are arranged on a pile body, one pile is arranged, one anchor is arranged, and the horizontal included angle is 15 degrees. The opposite side of the bearing platform is supported by a slope-releasing spray anchor, the slope-releasing height is 2.1m, the slope ratio is 1:1, the thickness of the spray anchor is 80mm, and a 40 multiplied by 70 multiplied by 1mm steel plate net is arranged in the support.

In this embodiment, the bank protection 2 extends to the subaerial top of top and protects 9 departments, and still is provided with at bank protection 2 and top and protects 9 junctions and beat into formula earth anchor 11. The slope protection 2 has a slope rate of 1: 0.3, two soil nails 12 are arranged, the thickness of the anchor spraying surface layer is not less than 100mm, and a reinforcing mesh is arranged in the anchor spraying surface layer.

In this embodiment, the top enclosure assembly 9 includes a guardrail 91 connected to the top of the revetment 2 and a water intercepting platform 92 connecting between the guardrail 91 and the top of the slope; the water interception platform 92 is of a concrete structure, and the water interception platform 92 is integrally connected with an anchor spray face on the outer side of the revetment 2.

During site construction, the height of the upper part slope is 3.0m, and the slope rate is 1: 0.3, 2 soil nails 12 are arranged, the thickness of the anchor spraying surface layer is 100mm, and a reinforcing steel bar net sheet with the diameter of 6.5@200 multiplied by 200 is arranged in the anchor spraying surface layer. Slope protection 2 extends to the subaerial top of top and encloses and protect 9 departments of subassembly, still is provided with at slope protection 2 and top enclosure and protects 9 junctions and beat into formula earth anchor 11, and domatic setting outlet, outlet level and vertical interval are 3000mm, and the outlet is ∅ 50PVC pipe, and length is not less than 0.80 m.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.

Claims

1. A composite supporting structure is characterized by comprising a foundation pit (1), a protective slope (2) arranged on the periphery of the foundation pit (1), a waterproof curtain (3) connected to the slope foot of the protective slope (2), soil nails (12) connected to the protective slope (2), a top enclosure component (9) connected to the slope top of the protective slope (2), and a core pile (4) connected to the waterproof curtain (3);

the bottom end of the core pile (4) is higher than the bottom end of the waterproof curtain (3), and the waterproof curtain (3) is arranged at intervals within the length range;

slope protection (2) extend to the subaerial top of top and protect subassembly (9) department, and still be provided with at slope protection (2) and top and protect subassembly (9) junction and beat into formula earth anchor (11).

2. A composite supporting construction according to claim 1, characterised in that the slope protection (2) has a slope ratio of 1: 0.3, two soil nails (12) are arranged, the thickness of the anchor spraying surface layer is not less than 100mm, and a reinforcing mesh is arranged in the anchor spraying surface layer.

3. A composite supporting construction according to claim 2, wherein the top enclosure assembly (9) comprises a guard rail (91) connected to the top of the revetment (2) and a water interception platform (92) connecting between the guard rail (91) and the top of the slope; the water intercepting platform (92) is of a concrete structure, and the water intercepting platform (92) is integrally connected with the anchor spraying surface on the outer side of the revetment (2).

4. A composite supporting structure as claimed in claim 1, wherein the waterproof curtain (3) is a set of mixing piles, the mixing piles are in occlusion connection, the top of the mixing pile exceeds the top of the aquifer, and the bottom of the mixing pile is embedded into the waterproof layer; the axle center of the mixing pile coincides with the axle center of the core pile (4).

5. A composite supporting construction, as claimed in claim 4, characterised in that the top of the core pile (4) is also connected with crown beams (5) provided with anchor cables (6) at vertical intervals; the bottom ends of the waterproof curtain (3) and the core piles (4) are lower than the bottom surface of a designed bottom backfill layer (7) of the foundation pit (1), and the top of the waterproof curtain is higher than the structural bottom plate (8).

6. A composite supporting construction according to claim 5, characterised in that the anchor lines (6) are provided in at least one row, the anchor lines (6) being angled at 15 ° to the horizontal.

7. A composite supporting construction as claimed in claim 6, wherein the core pile (4) is a tubular pile, a solid cylindrical pile or a profile steel pile, the top of the core pile (4) is fixedly connected with the crown beam (5), and the top of the core pile (4) extends into the crown beam (5).

8. A composite supporting structure as claimed in claim 7, wherein an anchor cable (6) is connected to the top beam (5), the cross section of the top beam (5) is right trapezoid, the inclined side faces the side of the foundation pit (1) and is anchored at an angle corresponding to the anchor cable (6).