CN111535331A - Underpinning structure of foundation pit inner support and construction method thereof - Google Patents
Underpinning structure of foundation pit inner support and construction method thereof Download PDFInfo
- Publication number
- CN111535331A CN111535331A CN202010392788.0A CN202010392788A CN111535331A CN 111535331 A CN111535331 A CN 111535331A CN 202010392788 A CN202010392788 A CN 202010392788A CN 111535331 A CN111535331 A CN 111535331A
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- Prior art keywords
- foundation pit
- support
- base
- underpinning structure
- column
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
Abstract
The invention relates to a underpinning structure for an inner support of a foundation pit, wherein a plurality of lattice columns and supporting beams which are mutually and vertically connected are arranged in the foundation pit, and the underpinning structure comprises: pouring a base formed on the bottom surface of the foundation pit, wherein the base is close to the latticed column to be cut off and is positioned outside the area of the main body structure to be constructed; the fixing piece is embedded in the base in advance, and the fixing piece part protrudes outwards from the top of the base; and the column body is vertically arranged and fixedly connected with the protruding part of the fixing piece, and is fixedly connected with the corresponding supporting beam. The invention effectively solves the problem that the support strength can not be ensured after the lattice columns at the conflict positions are cut off, and the underpinning structure is utilized to strengthen the inner support strength of the foundation pit, thereby meeting the construction requirement and ensuring the integral stability of the foundation pit.
Description
Technical Field
The invention relates to the field of building construction, in particular to a underpinning structure of an inner support of a foundation pit and a construction method thereof.
Background
Usually before the foundation ditch construction, need consider whether supporting construction can exert an influence to basement major structure construction, especially the position that sets up of lattice column, thick cushion cap basis need be avoided to the lattice column, the sump pit, the elevartor shaft, beam column isotructure, nevertheless there is the interior construction of supporting to accomplish the back in the actual construction, the temporary scheduling problem of revising of structure drawing, the condition such as part basement major structure and lattice column conflict appear, need to cut off the lattice column at this position, but the inside support intensity of foundation ditch can not satisfy design and construction requirements, the stability of foundation ditch can not be guaranteed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a underpinning structure for an inner support of a foundation pit and a construction method thereof, which solve the problem that the support strength cannot be ensured after lattice columns at conflict positions are cut off, and the underpinning structure is used for strengthening the inner support strength of the foundation pit, so that the construction requirement can be met, and the integral stability of the foundation pit is ensured.
The technical scheme for realizing the purpose is as follows:
the invention provides a underpinning structure for an inner support of a foundation pit, wherein a plurality of lattice columns and supporting beams which are mutually and vertically connected are arranged in the foundation pit, and the underpinning structure comprises:
pouring a base formed on the bottom surface of the foundation pit, wherein the base is close to the latticed column to be cut off and is positioned outside the area of the main body structure to be constructed;
the fixing piece is embedded in the base in advance, and the fixing piece part protrudes outwards from the top of the base; and
and the cylinder is vertically arranged and fixedly connected with the protruding part of the fixing piece and is fixedly connected with the corresponding supporting beam.
The underpinning structure for the inner support of the foundation pit is adopted, the base is formed by pouring the bottom surface of the foundation pit, the fixing piece is embedded in the base, the column body is fixed on the fixing piece and is fixedly connected with the corresponding supporting beam, at the moment, the underpinning structure is formed outside the area which is close to the lattice column to be cut off and is positioned at the main body structure to be constructed, the lattice column to be cut off is cut off after the structure is stable, the underpinning structure can ensure the inner support strength of the foundation pit, the problem that the support strength cannot be ensured after the lattice column at a conflict position is cut off is solved, the inner support strength of the foundation pit is enhanced by using the underpinning structure, the construction requirement can be met, and the.
The underpinning structure of the foundation pit inner support is further improved in that the underpinning structure further comprises:
the supporting piece is fixed on the side part of the column body and is arranged close to the supporting beam, and the top surface of the supporting piece is propped against the bottom surface of the supporting beam;
one end of the anchor bar is fixedly connected with the column body, and the other end of the anchor bar is anchored into the supporting beam; and
and pouring a connecting block formed at the connecting part of the column body and the supporting beam to fixedly connect the column body and the supporting beam, wherein the anchor bar is embedded in the connecting block.
The underpinning structure of the foundation pit inner support is further improved in that the column comprises:
the four vertical pipes are arranged in pairs in an opposite mode and are enclosed to form a rectangle, and the four vertical pipes are correspondingly attached to the side portions of the supporting beams;
the connecting plates are arranged at intervals along the length direction of the vertical pipes and fixedly connected between every two adjacent vertical pipes; and
and the inclined strut is obliquely supported between the two vertical pipes on the diagonal line.
The underpinning structure of the foundation pit inner support is further improved in that the support piece is L-shaped and comprises a vertical plate fixedly connected between two adjacent vertical pipes and a horizontal plate vertically connected to the vertical plate;
the horizontal plate vertical to the support beam is propped against the bottom surface of the support beam;
one end of the anchor bar is fixed on a vertical plate parallel to the support beam, and the other end of the anchor bar is vertically anchored into the support beam.
The underpinning structure of the foundation pit inner support is further improved in that the fixing piece comprises a fixing rib pre-buried in the base and a fixing plate fixed at the top of the fixing rib, the top surface of the fixing plate is flush with the top surface of the base, and the bottom of the column body is fixedly connected with the fixing plate.
The underpinning structure of the foundation pit inner support is further improved in that the height of the base is matched with that of a bottom plate to be formed at the bottom of the foundation pit.
The invention provides a construction method of a underpinning structure of an inner support of a foundation pit, which comprises the following steps:
pouring concrete at the position, close to the lattice column to be cut off, of the bottom surface of the foundation pit to form a base, wherein the base is formed outside the area of the main body structure to be constructed;
embedding a fixing piece in the base, wherein the fixing piece partially protrudes out of the base;
and the protruding part of the fixing piece is provided with a column body, and the column body is fixedly connected with the corresponding supporting beam.
The construction method of the underpinning structure of the foundation pit inner support is further improved in that when the column body and the supporting beam are fixedly connected, the construction method further comprises the following steps:
fixedly mounting a support part at the position of the side part of the column body close to the support beam so that the support part is abutted against the bottom surface of the support beam;
fixedly connecting a plurality of anchor bars to the column body, and anchoring the anchor bars into the supporting beams;
concrete is poured at the joint of the column body and the support beam to form a connecting block so as to fixedly connect the support beam and the column body, and the anchor bar is embedded in the connecting block.
The construction method of the underpinning structure of the foundation pit inner support is further improved in that the connecting block is formed by pouring C30 fine stone concrete.
The construction method of the underpinning structure of the foundation pit inner support is further improved in that the height of the base is matched with that of a bottom plate to be formed at the bottom of the foundation pit.
Drawings
Fig. 1 is an overall schematic view of the underpinning structure of the foundation pit inner support of the present invention.
Fig. 2 is a schematic structural view of a base portion in the underpinning structure of the foundation pit inner support of the present invention.
Fig. 3 is a schematic structural diagram of a column part in the underpinning structure of the foundation pit inner support.
FIG. 4 is a top view of the connection between the column and the support beam in the underpinning structure of the foundation pit inner support of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a underpinning structure for an inner support of a foundation pit, wherein a base is formed by pouring the bottom surface of the foundation pit, a fixing part is embedded in the base, a cylinder is fixed on the fixing part and is fixedly connected with a corresponding supporting beam, at the moment, an underpinning structure is formed outside an area which is close to a lattice column to be cut off and is positioned at a main body structure to be constructed, the lattice column to be cut off is cut off after the structure is stable, the underpinning structure can ensure the inner support strength of the foundation pit, the problem that the support strength cannot be ensured after the lattice column at a conflict position is cut off is solved, the inner support strength of the foundation pit is reinforced by using the underpinning structure, the construction requirement can be met, and the. The underpinning structure of the foundation pit inner support is explained below with reference to the attached drawings.
Referring to fig. 1, fig. 1 is an overall schematic view of a underpinning structure of an inner support of a foundation pit according to the present invention. The underpinning structure of the foundation pit inner support of the invention is explained below with reference to fig. 1.
As shown in fig. 1, the underpinning structure for the support in the foundation pit of the present invention, in which a plurality of lattice columns and supporting beams 21 are vertically connected to each other, is provided, and comprises:
pouring a base 11 formed on the bottom surface of the foundation pit, wherein the base 11 is close to the lattice column to be cut off and is positioned outside the area of the main body structure to be constructed;
a fixing member 12 pre-buried in the base 11, the fixing member 12 partially protruding outward from the top of the base 11; and
a column 14 vertically disposed and fixedly connected to the protruding portion of the fixing member 12, the column 14 being fixedly connected to the corresponding support beam 21.
Preferably, the height of the base 11 matches the height of the bottom plate to be formed at the bottom of the foundation pit, so as to avoid uneven bottom plate after construction.
As a preferred embodiment of the present invention, as shown in fig. 4, the present invention further includes:
a support member 13 fixed to a side of the column 14 and disposed adjacent to the support beam 21, a top surface of the support member 13 abutting against a bottom surface of the support beam 21;
an anchor bar 15 having one end fixedly connected to the column 14, the other end of the anchor bar 15 being anchored to the support beam 21; and
the connecting block 16 formed at the connecting position of the column 14 and the support beam 21 is poured to fixedly connect the column 14 and the support beam 21, and the anchor bar 15 is embedded in the connecting block 16.
Further, as shown in fig. 3, the column 14 includes:
the four vertical pipes 141 are arranged vertically, every two of the four vertical pipes 141 are arranged oppositely and enclose a rectangle, and the four vertical pipes 141 are correspondingly attached to the side part of the support beam 21;
a plurality of connection plates 142 arranged at intervals along the length direction of the vertical pipes 141 and fixedly connected between two adjacent vertical pipes 141; and
and a diagonal brace 143 supported obliquely between the two vertical pipes 141 on the diagonal line.
Specifically, the supporting member 13 is L-shaped, and includes a vertical plate 131 fixedly connected between two adjacent vertical pipes 141, and a horizontal plate 132 vertically connected to the vertical plate 131;
the horizontal plate 132 perpendicular to the support beam 21 abuts against the bottom surface of the support beam 21, that is, the horizontal plate 132 supports the support beam 21;
the anchor bar 15 has one end fixed to a vertical plate 131 parallel to the support beam 21 and the other end anchored perpendicularly to the support beam 21 to further enhance the strength of the connection of the support beam 21 to the column 14.
Further, as shown in fig. 2, the fixing member 12 includes a fixing rib 121 pre-embedded in the base 11 and a fixing plate 122 fixed on the top of the fixing rib 121, the top surface of the fixing plate 122 is flush with the top surface of the base 11, and the bottom of the column 14 is fixedly connected to the fixing plate 122.
The specific embodiment of the invention is as follows:
binding base reinforcing steel bars on the bottom surface of the foundation pit, which is close to the lattice column to be cut off and is positioned outside the region of the main structure to be constructed, fixedly connecting the fixing ribs with the base reinforcing steel bars, further pouring concrete to form a base 11, embedding the fixing ribs 121 in the base 11, and enabling the top surface of the fixing plate 122 to be flush with the top surface of the base 11;
manufacturing the column 14, correspondingly welding the vertical pipes 141 to the fixing plate 122, attaching the vertical pipes 141 to the side portions of the corresponding support beams 21, fixing the connecting plate 142 between the adjacent vertical pipes 141, and obliquely connecting the inclined struts 143 between the two diagonal vertical pipes 141;
welding the supporting piece 13 at a position close to the supporting beam 21 on the side part of the column body 14, fixedly connecting a vertical plate 131 of the supporting piece 13 to the side part of the column body 14, correspondingly abutting a horizontal plate 132 of the supporting piece 13 vertical to the supporting beam 21 against the bottom surface of the supporting beam 21 to support the supporting beam 21, fixedly connecting an anchor bar 15 on the vertical plate 131 of the supporting piece 13 parallel to the supporting beam 21, and vertically anchoring the anchor bar 15 into the supporting beam 21;
pouring concrete at the joint of the column body 14 and the supporting beam 21 to form a joint block 16, embedding the anchor bars 15 in the joint block 16 at the moment, and fixedly connecting the column body 14 and the supporting beam 21, wherein the anchor bars 15 can further strengthen the strength of the joint;
the underpinning structure is completed at the moment, the strength of the support in the foundation pit can be ensured, and the main structure can be constructed after the lattice column to be cut off is cut off.
The invention also provides a construction method of the underpinning structure of the foundation pit inner support, which comprises the following steps:
pouring concrete at the position, close to the lattice column to be cut off, of the bottom surface of the foundation pit to form a base 11, wherein the base 11 is formed outside the area of the main body structure to be constructed;
embedding a fixing piece 12 in the base 11, wherein the fixing piece 12 partially protrudes out of the base 11;
the columns 14 are installed at the protruded portions of the fixing members 12 and the columns 14 are fixedly connected to the corresponding support beams 21.
Further, when the column 14 and the support beam 21 are fixedly connected, the method further includes:
fixedly mounting the supporting member 13 at a position on the side of the column 14 near the supporting beam 21 so that the supporting member 13 abuts against the bottom surface of the supporting beam 21;
fixedly connecting a plurality of anchor bars 15 to the column body 14, and anchoring the anchor bars 15 into the supporting beam 21;
concrete is poured at the joint of the column body 14 and the support beam 21 to form a joint block 16 for fixedly connecting the support beam 21 and the column body 14, and the anchor bar 15 is embedded in the joint block 16.
Preferably, the engagement block 16 is cast from C30 fine stone concrete.
Specifically, the height of the base 11 matches the height of the bottom plate to be formed at the bottom of the foundation pit.
The concrete operation mode of the construction method provided by the invention is as follows:
binding base reinforcing steel bars on the bottom surface of the foundation pit, which is close to the lattice column to be cut off and is positioned outside the region of the main structure to be constructed, fixedly connecting the fixing ribs with the base reinforcing steel bars, further pouring concrete to form a base 11, embedding the fixing ribs 121 in the base 11, and enabling the top surface of the fixing plate 122 to be flush with the top surface of the base 11;
manufacturing the column 14, correspondingly welding the vertical pipes 141 to the fixing plate 122, attaching the vertical pipes 141 to the side portions of the corresponding support beams 21, fixing the connecting plate 142 between the adjacent vertical pipes 141, and obliquely connecting the inclined struts 143 between the two diagonal vertical pipes 141;
welding the supporting piece 13 at a position close to the supporting beam 21 on the side part of the column body 14, fixedly connecting a vertical plate 131 of the supporting piece 13 to the side part of the column body 14, correspondingly abutting a horizontal plate 132 of the supporting piece 13 vertical to the supporting beam 21 against the bottom surface of the supporting beam 21 to support the supporting beam 21, fixedly connecting an anchor bar 15 on the vertical plate 131 of the supporting piece 13 parallel to the supporting beam 21, and vertically anchoring the anchor bar 15 into the supporting beam 21;
pouring concrete at the joint of the column body 14 and the supporting beam 21 to form a joint block 16, embedding the anchor bars 15 in the joint block 16 at the moment, and fixedly connecting the column body 14 and the supporting beam 21, wherein the anchor bars 15 can further strengthen the strength of the joint;
the underpinning structure is completed at the moment, the strength of the support in the foundation pit can be ensured, and the main structure can be constructed after the lattice column to be cut off is cut off.
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 (10)
1. The utility model provides an underpinning structure of support in foundation ditch, be provided with a plurality of mutually perpendicular's lattice column and a supporting beam in the foundation ditch, its characterized in that, underpinning structure includes:
pouring a base formed on the bottom surface of the foundation pit, wherein the base is close to the latticed column to be cut off and is positioned outside the area of the main body structure to be constructed;
the fixing piece is embedded in the base and partially protrudes outwards from the top of the base; and
the post bodies are vertically arranged and fixedly connected with the protruding parts of the fixing pieces, and the post bodies are fixedly connected with the corresponding supporting beams.
2. The underpinning structure for an inner support of a foundation pit as claimed in claim 1, further comprising:
the supporting piece is fixed on the side part of the column body and is arranged close to the supporting beam, and the top surface of the supporting piece is propped against the bottom surface of the supporting beam;
one end of the anchor bar is fixedly connected with the column body, and the other end of the anchor bar is anchored into the supporting beam; and
and pouring a connecting block formed at the joint of the column body and the supporting beam to fixedly connect the column body and the supporting beam, wherein the anchor bars are embedded in the connecting block.
3. The underpinning structure for an internal support of a foundation pit as claimed in claim 2, wherein said column comprises:
the four vertical pipes are arranged in pairs in an opposite mode and enclose a rectangle, and the four vertical pipes are correspondingly attached to the side parts of the supporting beams;
the connecting plates are arranged at intervals along the length direction of the vertical pipes and fixedly connected between every two adjacent vertical pipes; and
and the inclined strut is obliquely supported between the two vertical pipes on the diagonal line.
4. The underpinning structure for an inner support of a foundation pit as claimed in claim 3, wherein said support member is L-shaped and comprises a vertical plate fixedly connected between two adjacent vertical pipes and a horizontal plate vertically connected to the vertical plate;
a horizontal plate vertical to the support beam is propped against the bottom surface of the support beam;
one end of the anchor bar is fixed on a vertical plate parallel to the supporting beam, and the other end of the anchor bar is vertically anchored into the supporting beam.
5. The underpinning structure for the inner support of the foundation pit as claimed in claim 1, wherein the fixing member comprises a fixing rib pre-embedded in the base and a fixing plate fixed at the top of the fixing rib, the top surface of the fixing plate is flush with the top surface of the base, and the bottom of the column body is fixedly connected with the fixing plate.
6. The underpinning structure for an inner support of an excavation as claimed in claim 1, wherein the base has a height matching a height of a floor to be formed at the bottom of the excavation.
7. A method of constructing an underpinning structure for an internal support of a foundation pit as claimed in claim 1, comprising the steps of:
pouring concrete at a position, close to the latticed column to be cut off, of the bottom surface of the foundation pit to form a base, wherein the base is formed outside an area of a main body structure to be constructed;
pre-burying a fixing piece in the base, wherein the fixing piece partially protrudes out of the base;
and mounting a cylinder on the protruding part of the fixing piece, and fixedly connecting the cylinder with the corresponding supporting beam.
8. The method of constructing an underpinning structure for an inner support of a foundation pit as claimed in claim 7, wherein when fixedly connecting the column body and the support beam, further comprising:
fixedly mounting a support part at the position of the side part of the column body close to the support beam so that the support part is abutted against the bottom surface of the support beam;
fixedly connecting a plurality of anchor bars to the column body, and anchoring the anchor bars into the supporting beams;
and pouring concrete at the joint of the column body and the support beam to form a connecting block so as to fixedly connect the support beam and the column body, and embedding the anchor bars in the connecting block.
9. The method of constructing an underpinning structure for an internal foundation pit support according to claim 8, wherein the said joint blocks are cast of C30 fine stone concrete.
10. The method of constructing an underpinning structure for an inner support of a foundation pit as claimed in claim 7, wherein the height of the pedestal matches the height of a floor to be formed at the bottom of the foundation pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010392788.0A CN111535331A (en) | 2020-05-11 | 2020-05-11 | Underpinning structure of foundation pit inner support and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010392788.0A CN111535331A (en) | 2020-05-11 | 2020-05-11 | Underpinning structure of foundation pit inner support and construction method thereof |
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| CN111535331A true CN111535331A (en) | 2020-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010392788.0A Pending CN111535331A (en) | 2020-05-11 | 2020-05-11 | Underpinning structure of foundation pit inner support and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114775631A (en) * | 2022-04-13 | 2022-07-22 | 上海勘测设计研究院有限公司 | Construction method for replacing support of internal support lattice column |
| CN115506370A (en) * | 2022-10-26 | 2022-12-23 | 中建一局集团建设发展有限公司 | Construction system and construction method for solving conflict between outer frame column and inner support node |
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| CN209523198U (en) * | 2018-10-30 | 2019-10-22 | 上海建工七建集团有限公司 | A kind of underpinning structure supporting lattice column |
| CN210031829U (en) * | 2019-01-14 | 2020-02-07 | 杭州江润科技有限公司 | Steel stand and supporting beam connection structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114775631A (en) * | 2022-04-13 | 2022-07-22 | 上海勘测设计研究院有限公司 | Construction method for replacing support of internal support lattice column |
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| CN115506370A (en) * | 2022-10-26 | 2022-12-23 | 中建一局集团建设发展有限公司 | Construction system and construction method for solving conflict between outer frame column and inner support node |
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