CN113463650A - Foundation pit inclined support system and foundation pit inner support construction method - Google Patents
Foundation pit inclined support system and foundation pit inner support construction method Download PDFInfo
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- CN113463650A CN113463650A CN202110711609.XA CN202110711609A CN113463650A CN 113463650 A CN113463650 A CN 113463650A CN 202110711609 A CN202110711609 A CN 202110711609A CN 113463650 A CN113463650 A CN 113463650A
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- 238000010276 construction Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 239000002689 soil Substances 0.000 claims abstract description 21
- 238000009412 basement excavation Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000011065 in-situ storage Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000005536 corrosion prevention Methods 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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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Abstract
The invention discloses a foundation pit diagonal bracing system and a foundation pit inner support construction method, wherein the foundation pit diagonal bracing system comprises a side wall enclosure structure of a foundation pit, a crown beam connected with the side wall enclosure structure, a steel pipe diagonal bracing and a bracket; the bracket is fixedly arranged on the foundation pit bottom plate, the steel pipe inclined strut is arranged between the side wall enclosure structure and the foundation pit bottom plate, one end of the steel pipe inclined strut is fixedly connected with the crown beam, and the other end of the steel pipe inclined strut is fixedly connected with the bracket. The foundation pit inner support construction method is based on a foundation pit inclined support system and comprises the following steps: (1) installing a long inclined strut; (2) excavating reserved soil and constructing a residual bottom plate; (3) installing a short type replacing support and dismantling a long type inclined support; (4) constructing a main body structure and dismantling the short inclined strut. It has the following advantages: the supporting material can be recycled, so that the supporting rigidity is increased; the supporting construction period is short, the excavation difficulty of the reserved soil is reduced, the construction cost is reduced, and the construction safety is improved.
Description
Technical Field
The invention relates to a foundation pit supporting structure, in particular to a foundation pit inclined supporting system and a foundation pit inner support construction method.
Background
The function of the foundation pit supporting system is to ensure that the excavation and the structural construction of the foundation pit can be smoothly finished according to a set plan under the anhydrous condition, not only the side wall is kept stable and the deformation of the soil layer is limited to ensure the normal use of the existing buildings and facilities outside the pit, but also the pit bottom soil is kept stable to ensure that the pit bottom soil body and the foundation are not damaged in structure and function.
In coastal and along-river regions, soft soil with a certain thickness generally exists in the depth range influenced by engineering construction. The soft soil has the characteristics of high water content, low shear strength, high compressibility, obvious rheological property and the like, and the foundation pit excavation difficulty is large. This puts higher demands on the safety and deformation control of the foundation pit supporting structure.
For a large deep foundation pit close to a building in a soft soil area, a cast-in-place pile, an underground continuous wall, an SMW construction method pile and the like are generally adopted as a side wall enclosure structure, one or more horizontal supports are adopted in a pit in combination with the excavation depth and the soil condition, the horizontal supports are adopted and can be carried out only when a main structure of the foundation pit is constructed to a support position, firstly, the exposure time of the foundation pit is too long, and great hidden danger is brought to the safety of the foundation pit; the construction period is too long, and the construction cost is increased; meanwhile, under the condition that the main body structure is constructed for most parts, the construction difficulty of the reserved soil excavation is increased, and the safety and the investment are correspondingly increased. The construction of the deep foundation pit mainly has the following difficulties and characteristics:
a. peripheral buildings (structures) are key protection objects for foundation pit excavation, and have small bearable deformation limit values;
b. the supporting structure does not allow access to the surrounding underground soil;
c. the construction site and the construction period of the supporting structure are strict.
Disclosure of Invention
The invention provides a foundation pit inclined support system and a foundation pit inner support construction method, which overcome the defects of the existing horizontal support in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a foundation pit diagonal bracing system comprises a side wall enclosure structure of a foundation pit, a crown beam connected with the side wall enclosure structure, a steel pipe diagonal bracing and a bracket; the bracket is fixedly arranged on the foundation pit bottom plate, the steel pipe inclined strut is arranged between the side wall enclosure structure and the foundation pit bottom plate, one end of the steel pipe inclined strut is fixedly connected with the crown beam, and the other end of the steel pipe inclined strut is fixedly connected with the bracket.
In one embodiment: the steel tube inclined strut is characterized by further comprising an upright post used for supporting the steel tube inclined strut, wherein one end of the upright post is vertically fixed on the base, and the other end of the upright post is connected to the axial middle part of the steel tube inclined strut.
In one embodiment: one end of the upright post is fixed to the base by an embedded cast-in-situ bored pile.
In one embodiment: the depth of the upright column embedded into the cast-in-situ bored pile is more than or equal to 3 meters.
In one embodiment: the steel pipe diagonal brace is a long diagonal brace of a steel pipe with the diameter of phi 609mm multiplied by 16 mm.
In one embodiment: the steel pipe inclined strut is a short type change strut of H400mm x400mm x13mm x21mm section steel.
According to the foundation pit inner support construction method based on the foundation pit diagonal support system, the steel pipe diagonal support is a long diagonal support or a short type replacement support, the length of the long diagonal support is larger than that of the short type replacement support, and the corbel is a diagonal support corbel used for being connected with the long diagonal support or a replacement support corbel used for being connected with the short type replacement support; the method comprises the following steps:
(1) after the construction of the side wall enclosure structure at the side of the foundation pit is finished, constructing a bottom plate and an inclined strut bracket of the unreserved soil area, and installing a long inclined strut after the concrete strength of the bottom plate and the inclined strut bracket reaches a designed value, so that two ends of the long inclined strut are respectively and fixedly connected with the crown beam and the inclined strut bracket;
(2) after the steel pipe supports are installed and qualified through inspection, reserved soil in the excavation pit is excavated to the bottom, the other foundation pit bottom plates and the support replacement brackets are constructed, and a bottom plate force transmission belt is constructed;
(3) firstly, a short type replacing support is not erected, after part of long inclined supports are tried to be disassembled, if the deformation of the side wall enclosure structure is monitored to be within a set allowable range and the force transmission belt of the bottom plate reaches the design strength, the long inclined supports are disassembled;
(4) and constructing a main body structure.
In one embodiment: in the step (3), if the deformation of the side wall enclosure structure is monitored to be out of the set allowable range, before the rest long inclined struts are dismantled, the short type replacement strut is erected, and two ends of the short type replacement strut are fixedly connected with the crown beam and the replacement strut bracket respectively.
In one embodiment: and (4) backfilling the outer wall of the foundation pit after the top plate of the basement of the foundation pit is finished, cutting off the short support outside the outer wall and carrying out corrosion prevention and rust resistance treatment, and removing the short support after backfilling is finished and deformation is stable.
In one embodiment: in the step (1), at least part of the long inclined strut with large span is provided with an upright post and a transverse connecting rod, one end of the upright post is vertically fixed on the substrate, and the other end of the upright post is connected to the axial middle part of the long inclined strut.
In one embodiment: in the step (2), the bottom plate force transmission belt is poured by concrete with the same mark number as the bottom plate, and the bottom plate force transmission belt is constructed to the side wall enclosure structure.
Compared with the background technology, the technical scheme has the following advantages:
1. the steel pipe inclined strut is used as the inner support, and the whole material can be recycled and recycled after the steel pipe inclined strut is detached, so that the steel pipe inclined strut has the advantages of being fast in construction, low in cost, free of waste concrete and the like. Meanwhile, the steel pipe inclined support is obliquely supported on the foundation slab, and the soil pressure behind the side wall of the foundation pit is obliquely transmitted to the foundation slab constructed in advance, so that the support length is greatly reduced, the support rigidity is ensured, the relevance of each side of the foundation pit is reduced, the foundation pit can be constructed independently and respectively, and the foundation pit has high flexibility.
2. The foundation pit inner support construction method has the advantages that after a foundation pit bottom plate is completed, supporting is completed in a synchronous mode, the construction period of foundation pit supporting is greatly shortened, construction cost is reduced, a main structure starts construction after supporting and building are completed, construction of the inner support is not needed after the main structure is constructed to a certain degree, reserved soil excavation difficulty is reduced, the defect that the exposure time of a foundation pit is too long is overcome, meanwhile, short support replacement is adopted, influence on construction of the main structure is reduced, and convenience and rapidness are achieved.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic view of the overall structure of a foundation pit diagonal bracing system (including a long diagonal bracing and a short type replacement bracing).
Fig. 2 is a schematic view of a short type support-changing structure.
Detailed Description
Referring to fig. 1 and 2, a foundation pit diagonal bracing system includes a sidewall enclosure 100 of a foundation pit, a crown beam 200 connected to the sidewall enclosure, a steel pipe diagonal brace, and a bracket; the bracket is fixedly arranged on the foundation pit bottom plate, the steel pipe inclined strut is arranged between the side wall enclosure structure 100 and the foundation pit bottom plate, one end of the steel pipe inclined strut is fixedly connected with the top beam 200, the other end of the steel pipe inclined strut is fixedly connected with the bracket, usually, a steel plate is embedded in the bracket, and the steel pipe inclined strut is fixedly connected with the bracket through the embedded steel plate.
To supporting the great steel pipe bracing of span, in order to prevent that the steel pipe bracing from leading to the support unstability because of axial centre pressure is too big, set up stand 12 and horizontal tie rod, the axial middle part at the steel pipe bracing is connected to the one end vertical fixation in basement and the other end of stand 12. The connection of the steel pipe inclined strut and the upright post 12 can adopt a profile steel welding bracket, one end of the upright post 12 can be fixed on the substrate through an embedded cast-in-situ bored pile 13, and the depth of the embedded cast-in-situ bored pile 13 of the upright post is more than or equal to 3 meters. The column 12 may be a steel tube column or a lattice column.
The steel pipe diagonal brace can be a long diagonal brace 11 of a steel pipe with the diameter of phi 609mm multiplied by 16 mm.
The steel pipe inclined strut can also be a short type change strut 21 of H400mm x400mm x13mm x21mm section steel.
Referring to fig. 1 and fig. 2, in the foundation pit inner support construction method based on the foundation pit diagonal bracing system, the steel pipe diagonal bracing is a long diagonal bracing 11 or a short type change bracing 21, the length of the long diagonal bracing 11 is greater than that of the short type change bracing 21, and the corbel is a diagonal bracing corbel 14 used for being connected with the long diagonal bracing or a support change corbel 24 used for being connected with the short type change bracing; the method comprises the following steps:
(1) installing a long inclined strut 11;
and after the reinforcing construction of the side wall enclosure structure 100 and the inner skirt 300 of the pit is completed, earth excavation is performed, after the excavation is completed, an early bottom plate 15 of a non-reserved soil area is constructed according to a civil construction drawing, the inclined strut bracket 14 and the inclined strut steel plate 16 are constructed together with the early bottom plate 15, and the inclined strut steel plate 16 is pre-embedded on the inclined strut bracket 14. And after the concrete strength of the early bottom plate 15 and the diagonal brace bracket 14 reaches the design value, installing the long diagonal brace 11, wherein the supporting points at two ends of the long diagonal brace 11 are the crown beam 200 and the diagonal brace bracket 14 arranged on the early bottom plate 15 respectively, so that two ends of the long diagonal brace 11 are fixedly connected with the crown beam 200 and the diagonal brace bracket 14 respectively.
Because most long bracing 11 span is great, in order to prevent that long bracing 11 from leading to the support unstability because of axial central pressure is too big, set up stand 12 and horizontal tie rod to the long bracing 11 that the span is great, the one end vertical fixation of stand 12 is in the basement and the other end is connected at the axial middle part of long bracing 11. The connection of the long inclined strut 11 and the upright post 12 adopts a steel section bracket connection. One end of the upright 12 is embedded into the cast-in-situ bored pile 13, and the depth of the upright 12 embedded into the cast-in-situ bored pile 13 is not less than 3 m. The top surface elevation must be controlled well when the upright post 12 is installed, and the installation accuracy of the long inclined strut 11 in the later period is ensured. The angle of the supporting surface of the diagonal bracing bracket 14 is required to meet the requirement, and the error is controlled within the allowable deviation range.
(2) Excavating reserved soil and constructing a residual bottom plate (a later-stage bottom plate 22);
after the installation of foundation ditch elongated bracing 11 is accomplished and acceptance check is qualified, begin to open and dig the interior reserve soil of hole, reserve soil and adopt the mini-excavator excavation, use elongated bracing 11 to divide into a plurality of districts with foundation ditch peripheral region as the border, use the district to excavate as the unit, because elongated bracing 11, stand 12 equidistant is less, the mechanical touch braced system and the stand of digging strictly forbid among the excavation process ensures foundation ditch safety. After the earth around the pit is excavated to the bottom, the other foundation pit bottom plates, namely the later-stage bottom plate 22, are constructed in a limited time, the support-replacing bracket 24 and the pre-buried support-replacing steel plate 23 of the short type support 21 are constructed at the same time, the bottom plate force transmission belt 400 is constructed, the bottom plate force transmission belt 400 is cast by concrete with the same label as the bottom plate, and is constructed to the side wall enclosure structure 100 of the pit.
(3) Short type of installation trades and props and demolish long bracing
Because the excavation depth of the foundation pit is large, the construction site environment is complex, the deformation control of the foundation pit is strict, and if the long inclined strut 11 is removed, the side wall maintenance structure 100 is in a cantilever state, and the cantilever height is large. In order to control the deformation of the foundation pit, a short type replacing support 21 is arranged, the length of the short type replacing support is short, and the influence on the construction of an underground structure is small. In implementation, the short type replacing support 21 is not directly erected, a part (generally two or three) of the long inclined supports 11 is tried to be disassembled, if the deformation of the sidewall enclosure structure 100 is monitored to be out of the set allowable range, the short type replacing support 21 is erected before the rest long inclined supports 11 are disassembled, and two ends of the short type replacing support 21 are fixedly connected with the crown beam 200 and the replacing support bracket 21 respectively. On the contrary, if the deformation of the sidewall enclosure 100 is monitored to be within the set allowable range, the short type support 21 does not need to be erected. When the short type is installed and the support 21 is replaced, a 10mm thick water stop steel plate 25 is arranged at the middle part of the basement outer wall 500 in the foundation pit and is fully welded with the short type replacement support 21.
If the short type exchange support 21 is not required to be installed and the floor force transmission belt 400 reaches the design strength, the remaining long inclined supports 11 can be directly dismantled. If the short type replacing support 21 needs to be installed, the long inclined support 11 is detached after the base plate force transmission belt 400 reaches the design strength and the installation of the short type replacing support 21 is completed.
(4) And constructing a main body structure. And (3) backfilling the outer wall of the foundation pit after the top plate of the basement of the foundation pit is finished, cutting off the short support-changing part outside the outer wall at the moment, performing corrosion prevention and rust resistance treatment, and removing the short support-changing 21 after backfilling is finished and deformation is stable.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (11)
1. The utility model provides a foundation ditch diagonal bracing system which characterized in that: the foundation pit supporting structure comprises a side wall supporting structure of a foundation pit, a crown beam connected with the side wall supporting structure, a steel pipe inclined strut and a bracket; the bracket is fixedly arranged on the foundation pit bottom plate, the steel pipe inclined strut is arranged between the side wall enclosure structure and the foundation pit bottom plate, one end of the steel pipe inclined strut is fixedly connected with the crown beam, and the other end of the steel pipe inclined strut is fixedly connected with the bracket.
2. The foundation pit diagonal bracing system according to claim 1, wherein: the steel tube inclined strut is characterized by further comprising an upright post used for supporting the steel tube inclined strut, wherein one end of the upright post is vertically fixed on the base, and the other end of the upright post is connected to the axial middle part of the steel tube inclined strut.
3. The foundation pit diagonal bracing system according to claim 1, wherein: one end of the upright post is fixed to the base by an embedded cast-in-situ bored pile.
4. The foundation pit diagonal bracing system according to claim 3, wherein: the depth of the upright column embedded into the cast-in-situ bored pile is more than or equal to 3 meters.
5. The foundation pit diagonal bracing system according to any one of claims 1 to 4, wherein: the steel pipe diagonal brace is a long diagonal brace of a steel pipe with the diameter of phi 609mm multiplied by 16 mm.
6. The foundation pit diagonal bracing system according to claim 1, wherein: the steel pipe inclined strut is a short type change strut of H400mm x400 x13mm x21mm section steel.
7. The foundation pit inner support construction method based on the foundation pit diagonal support system according to any one of claims 1 to 6, characterized in that: the steel pipe inclined strut is a long inclined strut or a short type change strut, the length of the long inclined strut is greater than that of the short type change strut, and the corbel is an inclined strut corbel used for being connected with the long inclined strut or a change strut corbel used for being connected with the short type change strut; the method comprises the following steps:
(1) after the construction of the side wall enclosure structure at the side of the foundation pit is finished, constructing a bottom plate and an inclined strut bracket of the unreserved soil area, and installing a long inclined strut after the concrete strength of the bottom plate and the inclined strut bracket reaches a designed value, so that two ends of the long inclined strut are respectively and fixedly connected with the crown beam and the inclined strut bracket;
(2) after the steel pipe supports are installed and qualified through inspection, reserved soil in the excavation pit is excavated to the bottom, the other foundation pit bottom plates and the support replacement brackets are constructed, and a bottom plate force transmission belt is constructed;
(3) firstly, a short type replacing support is not erected, after part of long inclined supports are tried to be disassembled, if the deformation of the side wall enclosure structure is monitored to be within a set allowable range and the force transmission belt of the bottom plate reaches the design strength, the long inclined supports are disassembled;
(4) and constructing a main body structure.
8. The method for supporting construction in a foundation pit according to claim 7, wherein: in the step (3), if the deformation of the side wall enclosure structure is monitored to be out of the set allowable range, before the rest long inclined struts are dismantled, the short type replacement strut is erected, and two ends of the short type replacement strut are fixedly connected with the crown beam and the replacement strut bracket respectively.
9. The method for constructing an inner support of a foundation pit according to claim 8, wherein: and (4) backfilling the outer wall of the foundation pit after the top plate of the basement of the foundation pit is finished, cutting off the short support outside the outer wall and carrying out corrosion prevention and rust resistance treatment, and removing the short support after backfilling is finished and deformation is stable.
10. The method for supporting construction in a foundation pit according to claim 7, 8 or 9, wherein: in the step (1), at least part of the long inclined strut with large span is provided with an upright post and a transverse connecting rod, one end of the upright post is vertically fixed on the substrate, and the other end of the upright post is connected to the axial middle part of the long inclined strut.
11. The method for supporting construction in a foundation pit according to claim 7, wherein: in the step (2), the bottom plate force transmission belt is poured by concrete with the same mark number as the bottom plate, and the bottom plate force transmission belt is constructed to the side wall enclosure structure.
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| CN114086596A (en) * | 2021-11-17 | 2022-02-25 | 中天建设集团有限公司 | Detachment-free support changing construction method for underground roof construction |
| CN114941333A (en) * | 2022-07-07 | 2022-08-26 | 上海宝冶集团有限公司 | Secondary support replacing construction method for deep foundation pit adjacent to subway |
| CN114960664A (en) * | 2022-04-22 | 2022-08-30 | 上海宝冶集团南京建筑有限公司 | Deep foundation pit supporting and support changing device for wall-penetrating H-shaped steel support and concrete force transmission belt |
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