CN110485452B - Independent foundation constructed on bearing layer and construction method thereof - Google Patents
Independent foundation constructed on bearing layer and construction method thereof Download PDFInfo
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- CN110485452B CN110485452B CN201910769128.7A CN201910769128A CN110485452B CN 110485452 B CN110485452 B CN 110485452B CN 201910769128 A CN201910769128 A CN 201910769128A CN 110485452 B CN110485452 B CN 110485452B
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
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Abstract
The invention relates to an independent foundation constructed on a bearing stratum and a construction method thereof, wherein the independent foundation comprises the following components: the main structure is poured in the super-excavation foundation pit, and a backfill space is reserved between the peripheral side wall of the main structure and the inner side wall corresponding to the super-excavation foundation pit; the cushion blocks are arranged on the top surface of the main body structure and positioned at the corresponding edges; a plurality of leveling cushion blocks cast on the ground at the corresponding edges of the super-excavation foundation pit in a cast-in-place mode, wherein the top surfaces of the leveling cushion blocks are flush with the top surfaces of the cushion blocks; the backfill layer is filled in the backfill space, and the top surface of the backfill layer is flush with the top surface of the cushion block; the supporting beams are used for supporting the floor, and the two opposite ends of the supporting beams are supported on the cushion blocks and the corresponding leveling cushion blocks. The top surfaces of the cushion blocks are used as reference standards, and the leveling cushion blocks are cast in situ, so that the supporting beams can be horizontally arranged, and the defect that the ground around the super-excavation foundation pit is influenced by excavation and is not necessarily horizontal is overcome. And supporting the floor by using the supporting beam.
Description
Technical Field
The invention relates to the field of building construction, in particular to an independent foundation constructed on a bearing layer and a construction method thereof.
Background
When the superstructure of the building is supported by a frame structure or a single-layer bent structure, the foundation of the building is usually an independent foundation in the form of square, round and the like. The independent foundation is located on the bearing stratum, the bearing stratum is normally a medium-weathering rock stratum or a strong-weathering rock stratum, the rock stratum excavation depth is not easy to control, and one excavation part often brings a large piece of rock to generate an over-excavation phenomenon. When the overbreak phenomenon occurs, the terrace on the backfill layer constructed around the independent foundation of the bearing layer is easy to subside.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an independent foundation constructed on a bearing layer and a construction method thereof, and solves the problem that the terrace on the backfill layer around the independent foundation is easy to settle in the prior art.
The technical scheme for realizing the purpose is as follows:
the invention provides an independent foundation constructed in a bearing layer, which is poured in an overexcavation foundation pit excavated in the bearing layer, wherein the independent foundation comprises:
the main body structure is poured in the super-excavation foundation pit, and a backfill space is reserved between the peripheral side wall of the main body structure and the inner side wall corresponding to the super-excavation foundation pit;
the cushion blocks are arranged on the top surface of the main body structure and positioned at the corresponding edges;
a plurality of leveling cushion blocks cast on the ground at the corresponding edges of the super excavation foundation pit in a cast-in-place mode, wherein the top surfaces of the leveling cushion blocks are flush with the top surfaces of the cushion blocks;
the backfill layer is filled in the backfill space, and the top surface of the backfill layer is flush with the top surface of the cushion block; and
the supporting beams are used for supporting the floor, and the two opposite ends of each supporting beam are supported on the cushion blocks and the corresponding leveling cushion blocks.
The invention discloses an independent foundation constructed on a bearing stratum and a construction method thereof, and has the following beneficial effects:
according to the invention, the plurality of cushion blocks are arranged on the top surface of the main body structure and at the positions corresponding to the edges, the leveling cushion blocks are cast in situ on the ground corresponding to the edges of the super-excavation foundation pit by using the horizontally arranged top surfaces of the main body structure and the cushion blocks as reference standards, and the top surfaces of the leveling cushion blocks are flush with the top surfaces of the cushion blocks, so that supporting beams for subsequently constructing the cushion blocks and the leveling cushion blocks can be horizontally arranged, and the defect that the ground around the super-excavation foundation pit is influenced by excavation and is not necessarily horizontal in the process of excavating the super-excavation foundation pit in the prior art is overcome. Through pour on the cushion and the cushion of making level and form a plurality of supporting beam, utilize a supporting beam to play the effect of supporting the terrace, can guarantee the stability of terrace, can solve among the prior art directly lay the terrace on the backfill layer and cause the problem that the terrace sinks easily.
The invention further improves the independent foundation constructed on the bearing layer, and the independent foundation also comprises a back-filling layer which is filled on the back-filling layer and is positioned between two adjacent support beams, and the top surface of the back-filling layer is flush with the top surfaces of the support beams.
The invention is further improved in that the backfill layer and the back backfill layer are plain soil layers.
The invention is further improved by constructing the independent foundation of the bearing layer, wherein the main body structure comprises:
the cushion layer is poured in the super-excavation foundation pit, and the backfill space is formed between the peripheral side wall of the cushion layer and the inner wall corresponding to the super-excavation foundation pit; and
and the base layer is poured on the cushion layer, and the bottom area of the base layer is smaller than the top area of the cushion layer.
The invention provides a construction method of an independent foundation constructed on a bearing stratum, which comprises the following steps:
excavating the bearing stratum to form an overexcavation foundation pit;
pouring the super-excavated foundation pit to form a main body structure, and reserving a backfill space between the peripheral side wall of the main body structure and the inner side wall corresponding to the super-excavated foundation pit;
arranging a plurality of cushion blocks on the top surface of the main body structure and at the corresponding edges;
pouring a plurality of leveling cushion blocks on the ground at the corresponding edges of the super-excavated foundation pit, so that the top surfaces of the leveling cushion blocks are flush with the top surfaces of the cushion blocks;
filling the backfill space to form a backfill layer with the top surface flush with the top surface of the cushion block; and
and pouring to form a plurality of supporting beams for supporting the terrace, wherein the two opposite ends of each supporting beam are respectively supported on the cushion blocks and the corresponding leveling cushion blocks.
The construction method of the independent foundation constructed on the bearing stratum is further improved in that a back-filling layer positioned between two adjacent support beams is filled and formed on the back-filling layer, and the top surface of the back-filling layer is flush with the top surfaces of the support beams.
The construction method of the independent foundation constructed on the bearing stratum is further improved in that the step of pouring the main body structure in the super-excavation foundation pit comprises the following steps:
providing a cushion layer template, vertically arranging the cushion layer template in the ultra-excavation foundation pit, and forming the backfill space between the peripheral side wall of the cushion layer template and the inner wall corresponding to the ultra-excavation foundation pit;
pouring a cushion layer in the enclosed area of the cushion layer template;
providing a basic template, and vertically arranging the basic template on the top surface of the cushion layer and close to the corresponding edge; and
and pouring in the enclosing area of the foundation template to form a foundation layer.
The construction method of the independent foundation constructed on the bearing layer is further improved in that a plurality of supporting beams for supporting the terrace are formed by pouring, the method comprises the steps of providing a plurality of beam templates, supporting the beam templates on the cushion blocks and the leveling cushion blocks, and pouring the beam templates to form the supporting beams.
Drawings
FIG. 1 is a schematic plan view of an independent foundation constructed on a bearing layer according to the present invention.
Fig. 2 is a longitudinal sectional view of the independent foundation constructed on the bearing layer according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, a schematic plan view of the independent foundation of the present invention constructed on a bearing layer is shown. Fig. 2 is a longitudinal sectional view of the independent foundation constructed on the bearing layer according to the present invention. Referring to fig. 1 and 2, the independent foundation constructed on the bearing stratum of the present invention is poured into an overexcavation pit excavated in the bearing stratum 10, and the independent foundation constructed on the bearing stratum includes:
the main structure 20 is poured in the super-excavation foundation pit, and a backfill space is reserved between the peripheral side wall of the main structure 20 and the inner side wall corresponding to the super-excavation foundation pit;
a plurality of cushion blocks 40 arranged on the top surface of the main body structure and positioned at the corresponding edges;
a plurality of leveling cushion blocks 41 cast on the ground at the corresponding edges of the super excavation foundation pit in a cast-in-place mode, wherein the top surfaces of the leveling cushion blocks 41 are flush with the top surfaces of the cushion blocks 40;
the backfill layer 30 is filled in the backfill space, and the top surface of the backfill space is flush with the top surface of the cushion block 40; and
and a plurality of support beams 50 for supporting the floor 60, wherein opposite ends of the support beams 50 are supported on the cushion blocks 40 and the corresponding leveling cushion blocks 41.
Set up a plurality of cushions 40 through the top surface at major structure 20 and be located the position that corresponds the border, utilize the top surface that major structure 20 and cushion 40's level set up as the reference standard, the subaerial cast-in-place formation of the foundation ditch that surpasses excavation corresponds the border cushion 41 of making level, the top surface of the cushion 41 of making level and the top surface of cushion 40 flush to can make follow-up construction in cushion 40 and the supporting beam 50 of cushion 41 of making level set up, remedied among the prior art excavation and form the in-process of surpassing excavation foundation ditch, the peripheral ground of surpassing excavation foundation ditch receives the excavation influence and not necessarily horizontally not enough.
As a preferred embodiment of the independent foundation of the present invention, the present invention further comprises a back-filling layer filled on the back-filling layer 30 and located between two adjacent support beams 50, wherein the top surface of the back-filling layer is flush with the top surfaces of the support beams 50.
By keeping the top surface of the back-filling layer flush with the top surface of the support beam 50, a flat surface is formed, which facilitates the subsequent casting of the terrace 60 on the flat surface. The support beam 50 can support the floor 60 to prevent the floor 60 from sinking. The number and position of the support beams 50 are not limited, and can be determined according to the actual construction requirements,
in this embodiment, the backfill layer 30 and the post-backfill layer are both layers of prime soil. In the backfilling process, the backfilling is carried out by layering and tamping so as to compact the backfill layer 30 and the back backfill layer and prevent the subsequent sedimentation problem.
As a preferred embodiment of the independent foundation constructed on the bearing layer of the present invention, the main body structure 20 includes:
the cushion layer 21 is poured in the super-excavation foundation pit, and the backfill space is formed between the peripheral side wall of the cushion layer 21 and the inner wall corresponding to the super-excavation foundation pit; and
and the base layer 22 is poured on the cushion layer 21, and the bottom area of the base layer 22 is smaller than the top area of the cushion layer 21. The cushion layer 21 is arranged to make up the part of the excavated foundation pit exceeding the height of the foundation layer 22, and the thickness of the cushion layer 21 is determined according to the height of the excavated foundation pit exceeding the height of the foundation layer 22. The problem of excavation too deeply when excavation foundation ditch is solved.
After the supporting layer 10 is excavated to form the super-excavation foundation pit, the position line of the cushion layer 21 is placed in the super-excavation foundation pit, the formwork is erected for construction to form a cushion layer thickened by plain concrete, and the foundation layer 22 is constructed on the cushion layer 21 after the cushion layer 21 reaches the strength. In this embodiment, the top periphery of the cushion layer 21 is 100mm wider than the bottom periphery of the base layer 22. The template of the foundation layer is convenient to erect on the cushion layer 21 subsequently. The support beam 50 is a reinforced concrete structural beam.
The invention also provides a construction method of the independent foundation constructed on the bearing stratum, which comprises the following steps:
excavating the bearing stratum to form an overexcavation foundation pit;
pouring to form a main body structure 20 in the super-excavation foundation pit, and reserving a backfill space between the peripheral side walls of the main body structure 20 and the inner side walls corresponding to the super-excavation foundation pit;
a plurality of cushion blocks 40 are arranged on the top surface of the main body structure 20 and positioned at the corresponding edges;
pouring a plurality of leveling cushion blocks 41 on the ground at the corresponding edges of the super-excavated foundation pit, so that the top surfaces of the leveling cushion blocks 41 are flush with the top surfaces of the cushion blocks 40;
filling the backfill space to form a backfill layer 30 with the top surface flush with the top surface of the cushion block 40; and
and a plurality of supporting beams 50 for supporting the floor 60 are formed by pouring, and two opposite ends of each supporting beam 50 are respectively supported on the cushion block 40 and the corresponding leveling cushion block 41.
The invention also includes filling a back-filling layer between two adjacent support beams 50 on the back-filling layer 30, wherein the top surface of the back-filling layer is flush with the top surfaces of the support beams 50.
Pouring in the super excavation foundation ditch and forming major structure 20 includes:
providing a cushion layer template, vertically arranging the cushion layer template in the ultra-excavation foundation pit, and forming the backfill space between the peripheral side wall of the cushion layer template and the inner wall corresponding to the ultra-excavation foundation pit;
pouring a cushion layer 21 in the enclosed area of the cushion layer template;
providing a base template, and vertically arranging the base template on the top surface of the cushion layer 21 and close to the corresponding edge; and
and pouring to form a foundation layer 22 in the enclosing area of the foundation template.
And pouring to form a plurality of supporting beams 50 for supporting the floor, wherein the step of pouring comprises the steps of providing a plurality of beam templates, supporting the beam templates on the cushion blocks 40 and the leveling cushion blocks 41, and pouring to form the supporting beams 50 on the beam templates.
In this embodiment, the cushion layer 21, the foundation layer 22 and the support beams 50 are all cast by erecting a formwork.
The invention discloses an independent foundation constructed on a bearing stratum and a construction method thereof, and has the following beneficial effects:
according to the invention, the plurality of cushion blocks are arranged on the top surface of the main body structure and at the positions corresponding to the edges, the leveling cushion blocks are cast in situ on the ground corresponding to the edges of the super-excavation foundation pit by using the horizontally arranged top surfaces of the main body structure and the cushion blocks as reference standards, and the top surfaces of the leveling cushion blocks are flush with the top surfaces of the cushion blocks, so that supporting beams for subsequently constructing the cushion blocks and the leveling cushion blocks can be horizontally arranged, and the defect that the ground around the super-excavation foundation pit is influenced by excavation and is not necessarily horizontal in the process of excavating the super-excavation foundation pit in the prior art is overcome. Through pour on the cushion and the cushion of making level and form a plurality of supporting beam, utilize a supporting beam to play the effect of supporting the terrace, can guarantee the stability of terrace, can solve among the prior art directly lay the terrace on the backfill layer and cause the problem that the terrace sinks easily.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (8)
1. The utility model provides a be under construction in the independent basis on holding power layer, pour in excavating in the intraformational super excavation foundation ditch of holding power, its characterized in that, independent basis includes: the main body structure is poured in the super-excavation foundation pit, and a backfill space is reserved between the peripheral side wall of the main body structure and the inner side wall corresponding to the super-excavation foundation pit; the cushion blocks are arranged on the top surface of the main body structure and positioned at the edges; a plurality of leveling cushion blocks cast on the ground at the edge of the super-excavation foundation pit in a cast-in-place mode, wherein the top surfaces of the leveling cushion blocks are flush with the top surfaces of the cushion blocks; the backfill layer is filled in the backfill space, and the top surface of the backfill layer is flush with the top surface of the cushion block; and a plurality of supporting beams for supporting the floor, wherein the two opposite ends of each supporting beam are supported on the cushion blocks and the corresponding leveling cushion blocks.
2. The isolated footing of claim 1 further comprising a back-fill layer disposed on said back-fill layer between two adjacent said support beams, wherein a top surface of said back-fill layer is flush with a top surface of said support beams.
3. The isolated footing of claim 2 wherein said backfill layer and said post-backfill layer are layers of virgin soil.
4. The free-standing foundation of claim 1 constructed in a bearing stratum wherein said body structure comprises: the cushion layer is poured in the super-excavation foundation pit, and the backfill space is formed between the peripheral side wall of the cushion layer and the inner wall corresponding to the super-excavation foundation pit; and a foundation layer poured on the cushion layer, wherein the bottom area of the foundation layer is smaller than the top area of the cushion layer.
5. A method of constructing a free-standing foundation for a bearing layer, the method comprising:
excavating the bearing stratum to form an overexcavation foundation pit; pouring the super-excavated foundation pit to form a main body structure, and reserving a backfill space between the peripheral side wall of the main body structure and the inner side wall corresponding to the super-excavated foundation pit; a plurality of cushion blocks are arranged on the top surface of the main body structure and positioned at the edge; pouring a plurality of leveling cushion blocks on the ground at the edge of the super-excavation foundation pit, so that the top surfaces of the leveling cushion blocks are flush with the top surfaces of the cushion blocks; filling the backfill space to form a backfill layer with the top surface flush with the top surface of the cushion block; and pouring to form a plurality of supporting beams for supporting the floor, wherein the two opposite ends of each supporting beam are respectively supported on the cushion blocks and the corresponding leveling cushion blocks.
6. The method of constructing an independent foundation for a bearing stratum according to claim 5,
the back-filling layer is filled between two adjacent support beams, and the top surface of the back-filling layer is flush with the top surfaces of the support beams.
7. The method of claim 5, wherein the step of casting the main structure in the excavation pit comprises: providing a cushion layer template, vertically arranging the cushion layer template in the ultra-excavation foundation pit, and forming the backfill space between the peripheral side wall of the cushion layer template and the inner wall corresponding to the ultra-excavation foundation pit; pouring a cushion layer in the enclosed area of the cushion layer template; providing a basic template, and vertically arranging the basic template on the top surface of the cushion layer and close to the corresponding edge; and pouring in the enclosing area of the foundation template to form a foundation layer.
8. The method of constructing an independent foundation for a bearing stratum according to claim 5,
and pouring to form a plurality of supporting beams for supporting the terrace, wherein the plurality of supporting beams comprise a plurality of beam templates, the beam templates are arranged on the cushion blocks and the leveling cushion blocks in a supporting mode, and the supporting beams are formed on the beam templates in a pouring mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910769128.7A CN110485452B (en) | 2019-08-20 | 2019-08-20 | Independent foundation constructed on bearing layer and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910769128.7A CN110485452B (en) | 2019-08-20 | 2019-08-20 | Independent foundation constructed on bearing layer and construction method thereof |
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| Publication Number | Publication Date |
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| CN110485452A CN110485452A (en) | 2019-11-22 |
| CN110485452B true CN110485452B (en) | 2021-02-26 |
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| CN201910769128.7A Active CN110485452B (en) | 2019-08-20 | 2019-08-20 | Independent foundation constructed on bearing layer and construction method thereof |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4047356A (en) * | 1975-12-22 | 1977-09-13 | Depirro Mario Louis | Post footing form holder and stabilizer system |
| US4815891A (en) * | 1984-10-26 | 1989-03-28 | Thermal Power Corporation | Method for repairing an opening formed in and below a section of pavement |
| JP2830804B2 (en) * | 1995-11-21 | 1998-12-02 | 株式会社こあ | Concrete formless foundation excavation method |
| JP2002356857A (en) * | 2001-05-30 | 2002-12-13 | Takao Takamoto | Foundation constructing method |
| CN100523394C (en) * | 2007-12-19 | 2009-08-05 | 南通华新建工集团有限公司 | Construction method for concrete shaft wall module masonry |
| CN110004991B (en) * | 2019-04-29 | 2023-12-08 | 中铁第一勘察设计院集团有限公司 | Underground structure anti-floating system based on convex wing foot plate and construction method |
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