CN116163331A - Construction process of large-thickness variable-section raft foundation - Google Patents
Construction process of large-thickness variable-section raft foundation Download PDFInfo
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- CN116163331A CN116163331A CN202310295046.XA CN202310295046A CN116163331A CN 116163331 A CN116163331 A CN 116163331A CN 202310295046 A CN202310295046 A CN 202310295046A CN 116163331 A CN116163331 A CN 116163331A
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- steel pipe
- layer
- raft foundation
- support
- steel
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- 238000010276 construction Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 103
- 239000010959 steel Substances 0.000 claims abstract description 103
- 239000000758 substrate Substances 0.000 claims abstract description 5
- 239000002023 wood Substances 0.000 claims description 49
- 238000009415 formwork Methods 0.000 claims description 22
- 239000011159 matrix material Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 9
- 239000002689 soil Substances 0.000 abstract description 5
- 230000002787 reinforcement Effects 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0275—Retaining or protecting walls characterised by constructional features cast in situ
Abstract
The invention discloses a construction process of a large-thickness variable-section raft foundation, which comprises the following steps: forming a bottom layer retaining wall, pouring into a top layer retaining wall, and forming a raft steel bar steel pipe support frame and a raft foundation to be poured and layered. The construction process of the large-thickness variable-section raft foundation can effectively solve the construction problem caused by large thickness and large substrate height difference, effectively cope with a soil layer structure, greatly firmly realize the foundation structure, greatly reduce the consumption of reinforcing steel bars, effectively reduce the cost, and be more convenient and efficient in construction.
Description
Technical Field
The invention relates to the technical field of construction of building raft foundation, in particular to a construction process of a large-thickness variable-section raft foundation.
Background
The raft foundation is a foundation structure adopted in the current building according to the conditions of foundation types, soil layer distribution and the like, wherein the large-thickness variable-section raft foundation is also called an ultra-thick variable-section raft foundation, because the height difference of the lowest position of the raft foundation is large, the raft foundation needs high structural requirements on the pit high side surface in the pit, and meanwhile, the raft foundation has to bear the foundation bearing capacity of the building, when the number of building layers is higher, the thickness is larger, and the influences of soil layer composition, rock mass characteristics and the like are caused, the conventional or old raft foundation cannot be constructed to meet the requirements, the construction is more difficult, the use amount of reinforcing steel bars is also increased sharply, and the cost is high.
Disclosure of Invention
The purpose of the invention is that: the construction process of the large-thickness variable-section raft foundation can cope with the loose soil layer structure and can provide a stable foundation for high-rise buildings.
The construction process of the large-thickness variable-section raft foundation comprises the following steps:
firstly, after excavating earthwork, constructing a bedding layer, vertically arranging a single-sided wood formwork support when constructing the bedding layer at the position with the base height difference being more than 0.5m and less than 2m, arranging a steel pipe diagonal bracing between the inner side of the single-sided wood formwork support and the bedding layer, and then carrying out concrete backfilling between the outer side of the single-sided wood formwork support and a side slope to form a bottom retaining wall;
setting up a single-sided wood template support vertically when a cushion layer at the position with the substrate height difference larger than 2m is constructed, setting up a steel pipe diagonal brace between the inner side of the single-sided wood template support and the cushion layer, setting up a top layer retaining wall steel bar on the cushion layer at the outer side of the single-sided wood template support, then carrying out concrete backfilling between the outer side of the single-sided wood template support and the earthwork to form a bottom layer retaining wall, setting up a double-sided wood template support on the top layer retaining wall steel bar extending out of the bottom layer retaining wall, setting up a steel pipe diagonal brace between one side of the double-sided wood template support and a side slope, setting up a steel pipe diagonal brace between one side of the double-sided wood template support and the cushion layer, and casting concrete into the double-sided wood template support to form the top layer retaining wall;
arranging concrete cushion blocks 31 on the inner bottom surface of the raft foundation in a matrix distribution manner, arranging longitudinal and transverse lower-layer steel bars on the concrete cushion blocks, binding, welding a bottom support on the lower-layer steel bars in a distribution manner, arranging steel pipe upright posts at the upper ends of the bottom supports, arranging one or more layers of spaced steel pipe cross beams in the middle of the steel pipe upright posts, binding middle-layer steel bars correspondingly, and arranging one layer of steel pipe cross beams at the top of the steel pipe upright posts, binding upper-layer steel bars correspondingly to form a raft steel bar steel pipe support frame;
and fourthly, performing concrete pouring on the pits in the inner pits of the raft foundation to form a first concrete pouring area, and performing concrete pouring on the pits on the upper part in the raft foundation to form a second concrete pouring area, thereby completing the layered forming of the raft foundation.
In the first and second steps, short steel bars for fixedly connecting the steel pipe diagonal braces are pre-buried on the cushion layer at intervals.
In the first and second steps, the steel pipe diagonal brace connected with the single-sided wood template support is two, and the steel pipe diagonal brace connected with the double-sided wood template support and the steel pipe top brace are five.
In the second step, the double-sided wood formwork support comprises a red formwork, a wood column vertical edge, a double-steel-pipe transverse edge and a high-strength opposite-pull screw rod.
In the third step, the bottom support is shaped like a Chinese character 'tu', the bottom support is connected with the lower layer steel bar in a spot welding mode, and the lower end of the steel tube upright post is sleeved with the upper end of the bottom support.
In the third step, the steel pipe column is fastened to the steel pipe beam through a fastener, and the steel pipe column, the steel pipe beam and the fastener are subjected to oil and rust removal treatment.
In the fourth step, a water stop steel plate is arranged on the inner side wall of the raft foundation.
Compared with the prior art, the construction process of the large-thickness variable-section raft foundation has the beneficial effects that: the construction problem caused by large thickness and large substrate height difference can be effectively solved, the soil layer structure is effectively treated, the foundation structure is very firm, the consumption of reinforcing steel bars is greatly reduced, the cost is effectively reduced, and the construction is more convenient and efficient.
Drawings
Fig. 1 is a schematic view of a construction structure of a retaining wall at a bottom layer according to an embodiment of the present invention;
FIG. 2 is a schematic view of construction structures of a bottom retaining wall and a top retaining wall according to an embodiment of the present invention;
fig. 3 is a schematic view of a construction structure of a top retaining wall according to an embodiment of the present invention;
fig. 4 is a schematic view of a construction structure of a raft reinforcement steel pipe support frame in an embodiment of the invention;
fig. 5 is a schematic view of a partial structure of a raft reinforcement steel tube support frame in an embodiment of the present invention;
FIG. 6 is an enlarged schematic view of a construction structure at a shoe in an embodiment of the invention;
fig. 7 is a schematic view of a construction structure of a raft foundation cast and layered forming in an embodiment of the invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "mounted," "connected," and "connected" are to be construed broadly in this application, and may be either fixedly connected, detachably connected, or integrally connected, for example, unless otherwise explicitly stated and defined; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the description of the present invention, it should be further understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the machine or element in question must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. It should be understood that the terms "first," "second," and the like are used herein to describe various information, but such information should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the invention.
Referring to fig. 1 to 7, the construction process of the large-thickness variable-section raft foundation according to the embodiment of the invention comprises the following steps:
firstly, after earthwork is excavated, a cushion layer 1 is constructed, when the cushion layer 1 with the base height difference being more than 0.5m and less than 2m is constructed, a single-sided wood template support 21 is vertically arranged at an excavation control line, a steel pipe diagonal bracing 22 is arranged between the inner side of the single-sided wood template support 21 and the cushion layer 1, and then concrete backfilling is carried out between the outer side of the single-sided wood template support 21 and a side slope to form a bottom retaining wall;
setting a single-sided wood formwork support 21 vertically at an excavation control line when the bedding layer 1 with the substrate height difference being larger than 2m is constructed, setting a steel pipe diagonal brace 22 between the inner side of the single-sided wood formwork support 21 and the bedding layer 1, setting a top layer retaining wall reinforcing steel bar 23 at the outer side of the single-sided wood formwork support 21, backfilling concrete between the outer side of the single-sided wood formwork support 21 and the earthwork to form a bottom layer retaining wall, setting a double-sided wood formwork support 24 on the top layer retaining wall reinforcing steel bar 23 extending out of the bottom layer retaining wall, setting a steel pipe diagonal brace 25 between one side of the double-sided wood formwork support 24 and a side slope, setting the steel pipe diagonal brace 22 between one side of the double-sided wood formwork support 24 and the bedding layer 1, pouring concrete into the double-sided wood formwork support 24 to form a top layer retaining wall, and backfilling between the top layer retaining wall and the side slope after the double-sided wood formwork support and the steel pipe support are removed;
arranging concrete cushion blocks 31 on the inner bottom surface of a raft foundation in a matrix distribution manner, arranging lower layer steel bars 32 in a longitudinal and transverse manner on the concrete cushion blocks 31, binding, welding a bottom support 33 corresponding to the concrete on the lower layer steel bars 32 in a distribution manner, arranging steel pipe upright posts 34 at the upper ends of the bottom supports 33, arranging one or more layers of spaced steel pipe cross beams 35 and corresponding binding middle layer steel bars 36 in the middle of the steel pipe upright posts 34, arranging one layer of steel pipe cross beams 35 and corresponding binding upper layer steel bars 37 at the top of the steel pipe upright posts 34, and forming a raft steel bar steel pipe support frame, thereby greatly saving the consumption of steel bars and simultaneously ensuring that the support frame has enough structural strength;
and fourthly, firstly, performing concrete pouring on the pits in the inner pits of the raft foundation to form a first concrete pouring area 41, and then performing concrete pouring on the pits on the upper part in the raft foundation to form a second concrete pouring area 42, so that the layered forming of the raft foundation pouring is completed, and the pouring construction is smoother.
Referring to fig. 1-3, in the first and second steps, short steel bars 26 for fixedly connecting the steel pipe diagonal braces 22 are pre-buried on the cushion layer 1 at intervals, so that construction is facilitated.
Referring to fig. 1 to 3, in the first and second steps, the steel pipe diagonal braces 22 connected to the single-sided wood form support 21 are two, and the steel pipe diagonal braces 22 and the steel pipe diagonal braces 25 connected to the double-sided wood form support 24 are five, respectively, so that the single-sided wood form support 21 and the double-sided wood form support 24 are firmly fixed.
Referring to fig. 3, in an exemplary second step, the double-sided wood formwork support 24 includes a red formwork, a wood beam vertical edge, a double-steel-pipe transverse edge and a high-strength opposite wire-drawing rod, preferably, the red formwork is 13mm to 18mm thick, the wood beam vertical edge is distributed at a horizontal distance of 300mm, the double-steel-pipe transverse edge is spaced at a horizontal distance of 500mm, and the high-strength opposite wire-drawing rod is ensured to construct and structurally strengthen the top-layer retaining wall.
Referring to fig. 6, in the third step, the shoe 33 is shaped like a letter "earth", the shoe 33 is spot-welded to the lower layer steel bar 32, and the lower end of the steel pipe column 34 is sleeved on the upper end of the shoe 33, so that the shoe 33 is firmly fixed and the steel pipe column 34 is firmly supported.
In the third step, the steel pipe column 34 is fastened to the steel pipe beam 35 through a fastener, and the steel pipe column 34, the steel pipe beam 35 and the fastener are subjected to oil and rust removal treatment, so that the structure is durable and the strength is firm.
In the fourth step, a water stop steel plate is arranged on the periphery of the inner side wall of the raft foundation, so that later-stage water seepage of the raft construction joint is effectively prevented.
Referring to fig. 1-5, an exemplary embodiment of the present invention provides a large-thickness variable-section raft foundation structure, including a retaining wall and a raft reinforcement steel tube support frame, where the retaining wall is disposed around the periphery of the raft foundation, the retaining wall includes a bottom retaining wall and a top retaining wall formed by layering from bottom to top, the raft reinforcement steel tube support frame includes a concrete pad 31, a lower layer reinforcement 32, a bottom support 33, a steel tube column 34, a steel tube beam 35, a middle layer reinforcement 36 and an upper layer reinforcement 37, the concrete pad 31 is distributed on an inner bottom of the raft foundation along a matrix, the lower layer reinforcement 32 is vertically and horizontally distributed and connected to the concrete pad 31, the bottom support 33 is distributed and connected to the lower layer reinforcement 32 along a matrix, each bottom support 33 is connected to one steel tube column 34, a middle layer or more of steel tube beam 35 and the middle layer reinforcement 36 are connected to the middle portion of the steel tube column 34, and the top of the steel tube column 34 is connected to one layer of steel tube beam 35 and the upper layer reinforcement 37, thereby well forming the raft foundation, the large-thickness and the large-thickness variable-section raft foundation structure is well reduced, and the cost of the raft foundation structure is well reduced.
Illustratively, the shoe 33 is made of a steel pipe with a diameter of 28mm or more, and the height of the shoe 33 is 260mm to 360mm.
Illustratively, the middle layer steel bar 36 and the upper layer steel bar 37 are respectively connected to the upper side of the steel pipe beam 35 through binding, so that the construction is easy, and the structure is firm.
Illustratively, the steel pipe column 34 is fastened to the steel pipe beam 35 by a fastener, which further reduces the construction time.
Referring to fig. 1 to 3, the bottom retaining wall is exemplarily made of concrete backfill between an earth slope and a single-sided timber formwork support 21, and the top retaining wall is made of cast concrete in a double-sided timber formwork support 24, thereby ensuring simple construction of the bottom retaining wall and having a firm structure, and effectively reducing the amount of concrete used for the top retaining wall.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (7)
1. The construction process of the large-thickness variable-section raft foundation is characterized by comprising the following steps of:
firstly, after excavating earthwork, constructing a bedding layer, vertically arranging a single-sided wood formwork support when constructing the bedding layer at the position with the base height difference being more than 0.5m and less than 2m, arranging a steel pipe diagonal bracing between the inner side of the single-sided wood formwork support and the bedding layer, and then carrying out concrete backfilling between the outer side of the single-sided wood formwork support and a side slope to form a bottom retaining wall;
setting up a single-sided wood template support vertically when a cushion layer at the position with the substrate height difference larger than 2m is constructed, setting up a steel pipe diagonal brace between the inner side of the single-sided wood template support and the cushion layer, setting up a top layer retaining wall steel bar on the cushion layer at the outer side of the single-sided wood template support, then carrying out concrete backfilling between the outer side of the single-sided wood template support and the earthwork to form a bottom layer retaining wall, setting up a double-sided wood template support on the top layer retaining wall steel bar extending out of the bottom layer retaining wall, setting up a steel pipe diagonal brace between one side of the double-sided wood template support and a side slope, setting up a steel pipe diagonal brace between one side of the double-sided wood template support and the cushion layer, and casting concrete into the double-sided wood template support to form the top layer retaining wall;
arranging concrete cushion blocks 31 on the inner bottom surface of the raft foundation in a matrix distribution manner, arranging longitudinal and transverse lower-layer steel bars on the concrete cushion blocks, binding, welding a bottom support on the lower-layer steel bars in a distribution manner, arranging steel pipe upright posts at the upper ends of the bottom supports, arranging one or more layers of spaced steel pipe cross beams in the middle of the steel pipe upright posts, binding middle-layer steel bars correspondingly, and arranging one layer of steel pipe cross beams at the top of the steel pipe upright posts, binding upper-layer steel bars correspondingly to form a raft steel bar steel pipe support frame;
and fourthly, performing concrete pouring on the pits in the inner pits of the raft foundation to form a first concrete pouring area, and performing concrete pouring on the pits on the upper part in the raft foundation to form a second concrete pouring area, thereby completing the layered forming of the raft foundation.
2. The large-thickness variable-section raft foundation construction process as claimed in claim 1, wherein: in the first step and the second step, short steel bars for fixedly connecting the steel pipe diagonal braces are pre-buried on the cushion layer at intervals.
3. The large-thickness variable-section raft foundation construction process as claimed in claim 1, wherein: in the first step and the second step, two steel pipe diagonal braces are connected with the single-sided wood template support, and five steel pipe diagonal braces are connected with the double-sided wood template support and the steel pipe top braces respectively.
4. The large-thickness variable-section raft foundation construction process as claimed in claim 1, wherein: in the second step, the double-sided wood template support comprises a red template, a wood column vertical edge, a double-steel-pipe transverse edge and a high-strength opposite-pull screw rod.
5. The large-thickness variable-section raft foundation construction process as claimed in claim 1, wherein: in the third step, the bottom support is shaped like a Chinese character 'Tu', the bottom support is connected with the lower layer steel bar in a spot welding mode, and the lower end of the steel pipe stand column is sleeved with the upper end of the bottom support.
6. The large-thickness variable-section raft foundation construction process as claimed in claim 1, wherein: in the third step, the steel pipe column is fastened with the steel pipe beam through a fastener, and oil and rust removal treatment is carried out on the steel pipe column, the steel pipe beam and the fastener.
7. The large-thickness variable-section raft foundation construction process as claimed in claim 1, wherein: in the fourth step, a water stop steel plate is arranged on the inner side wall of the raft foundation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310295046.XA CN116163331B (en) | 2023-03-23 | Construction process of large-thickness variable-section raft foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310295046.XA CN116163331B (en) | 2023-03-23 | Construction process of large-thickness variable-section raft foundation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116163331A true CN116163331A (en) | 2023-05-26 |
| CN116163331B CN116163331B (en) | 2024-05-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103572784A (en) * | 2013-11-21 | 2014-02-12 | 中建二局第三建筑工程有限公司 | Supporting system and construction method of post-cast strip template of super-thick raft |
| CN203795450U (en) * | 2014-05-05 | 2014-08-27 | 上海绿地建设(集团)有限公司 | Raft foundation steel bar binding supporting structure |
| WO2014139252A1 (en) * | 2013-03-15 | 2014-09-18 | 中国十七冶集团有限公司 | Method for constructing large raft foundation in high-temperature environment |
| WO2017152674A1 (en) * | 2016-03-10 | 2017-09-14 | 何发林 | Underground engineering waterproofing structure |
| CN215858626U (en) * | 2021-08-12 | 2022-02-18 | 中国建筑第四工程局有限公司 | Super thick raft foundation multilayer steel bar support frame |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014139252A1 (en) * | 2013-03-15 | 2014-09-18 | 中国十七冶集团有限公司 | Method for constructing large raft foundation in high-temperature environment |
| CN103572784A (en) * | 2013-11-21 | 2014-02-12 | 中建二局第三建筑工程有限公司 | Supporting system and construction method of post-cast strip template of super-thick raft |
| CN203795450U (en) * | 2014-05-05 | 2014-08-27 | 上海绿地建设(集团)有限公司 | Raft foundation steel bar binding supporting structure |
| WO2017152674A1 (en) * | 2016-03-10 | 2017-09-14 | 何发林 | Underground engineering waterproofing structure |
| CN215858626U (en) * | 2021-08-12 | 2022-02-18 | 中国建筑第四工程局有限公司 | Super thick raft foundation multilayer steel bar support frame |
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