CN217399672U - Supporting and protecting structure in foundation pit - Google Patents
Supporting and protecting structure in foundation pit Download PDFInfo
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- CN217399672U CN217399672U CN202221130409.1U CN202221130409U CN217399672U CN 217399672 U CN217399672 U CN 217399672U CN 202221130409 U CN202221130409 U CN 202221130409U CN 217399672 U CN217399672 U CN 217399672U
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Abstract
The utility model belongs to the technical field of building engineering, a support structure in foundation ditch is related to. In order to solve the technical problems of site pollution and influence on the construction period of a raft structure caused by foundation pit supporting by using an anchor cable structure in the prior art, the utility model provides an inner supporting structure of a foundation pit, which comprises a waterproof curtain, a plurality of slope protection piles, a raft unit, a first force transmission assembly, a second force transmission assembly and a plurality of steel pipe inner supports; the utility model applies axial prestress to the steel pipe inner support, the prestress is transmitted to the second force transmission component through the supporting counter-force provided by the first force transmission component, the raft and the engineering pile, and the supporting effect is achieved on the side wall of the foundation pit; the pollution and the influence on the site caused by water leakage and slurry leakage in the anchor cable construction are avoided, and the construction period is saved.
Description
Technical Field
The utility model belongs to the technical field of building engineering, a structure is protected to foundation ditch inner support is related to.
Background
With the promotion of urban updating projects, the transformation of old urban areas of cities brings about a large amount of deep foundation pit projects, the foundation pits are larger and larger in scale, and the excavation depth is deeper and deeper. In the foundation pit engineering in old urban areas, peripheral buildings and underground pipelines are particularly complex, the underground water level rises, the environmental conditions of the foundation pit are more and more complex, a waterproof curtain is usually adopted for intercepting water for protecting the safety of the peripheral buildings of the foundation pit, and an anchor rope structure is adopted for supporting in the foundation pit, but when a local elevator shaft deep pit exists, the site is greatly polluted and influenced by water leakage and slurry leakage caused by anchor rope construction; and the anchor cable construction plus age period needs about 20 days, the anchor cable can be dug and cleared after being tensioned, and then the raft structure construction is carried out, which causes serious influence on the construction period of the raft structure, and is an important problem which must be faced and solved in the current urban construction engineering.
SUMMERY OF THE UTILITY MODEL
In order to solve and use anchor rope structure to carry out produced place pollution of excavation supporting, influence raft structure construction period's technical problem, the utility model provides an inner supporting structure of foundation ditch.
The technical solution of the utility model is as follows:
the utility model provides a supporting structure in foundation ditch, needs the stagnant water curtain of strutting the inner wall including setting up at the foundation ditch, its special character lies in, still includes:
the raft unit comprises a raft and a plurality of engineering piles, and the raft is positioned at the bottom of the foundation pit and is opposite to the inner wall of the foundation pit to be supported; the engineering piles are positioned in a foundation pit soil layer and are used for supporting a raft plate; the range between the raft and the inner wall of the foundation pit to be supported is the digging range of a local deep foundation pit in the foundation pit;
the steel pipe inner supports are arranged, and one ends of the steel pipe inner supports are provided with movable heads; the plurality of steel pipe inner supports are positioned between the raft units and the inner wall of the foundation pit to be supported, and the two adjacent steel pipe inner supports are axially distributed in parallel;
the first force transmission assembly is fixedly arranged at the raft; one end of the steel pipe inner support is propped against the first force transmission assembly, and the counter force borne by the steel pipe inner support is transmitted to the engineering pile through the first force transmission assembly;
the second force transmission assembly is fixedly arranged on the inner wall of the foundation pit to be supported; the other end of the steel pipe inner support is supported against the second force transmission assembly, and the prestress applied to the steel pipe inner support is transmitted to the inner wall of the foundation pit to be supported through the second force transmission assembly.
By adopting the technical scheme, the utility model discloses can be before local deep basal pit digs and establishes, the construction of raft unit is carried out earlier, during raft unit concrete solidification, can install other component structures of supporting structure in the basal pit, apply axial prestressing force to the steel pipe inner support after raft unit concrete intensity reaches the design requirement, prestressing force is transmitted to second power transmission subassembly through the support counter-force that first power transmission subassembly, raft and engineering pile provided to play the supporting role to the foundation ditch lateral wall; through this technical scheme also solved the problem that the raft construction lags behind simultaneously.
Optionally, the first force transfer assembly includes a plurality of shear-resistant corbels, and the shear-resistant corbels are fixedly arranged at the top of the raft and are sequentially arranged along the length direction of the raft;
the first force transmission assembly further comprises a first steel waist beam, the first steel waist beam is placed on the raft and clings to the plurality of shear-resistant corbels, and the first steel waist beam is fixedly connected with the plurality of shear-resistant corbels; one end of the steel pipe inner support props against the other side, close to the shearing-resistant corbels, of the first steel waist beam.
Through adopting above-mentioned technical scheme, after applying axial prestressing force in supporting a plurality of steel pipes, preprocessing can loop through first steel waist rail, the even transmission of a plurality of corbels that shear to raft unit, can reduce raft unit's atress uneven, alleviates raft unit's deformation.
Optionally, the second force transmission assembly comprises a plurality of slope protection piles, and the slope protection piles are sequentially arranged along the length direction of the inner wall of the foundation pit to be supported and are tightly attached to the waterproof curtain;
the second force transmission assembly is also provided with a second steel wale, and the second steel wale is fixedly connected with the plurality of slope protection piles; the other end of the steel pipe inner support is propped against one side, far away from the slope protection piles, of the second steel waist beam.
Through adopting above-mentioned technical scheme, support in supporting and apply axial prestressing force back to a plurality of steel pipes, the preprocessing can loop through the even transmission of second steel waist roof beam to a plurality of fender slope piles, therefore the more even of the supporting power that the foundation ditch lateral wall received avoids the damage of local atress reinforce initiation.
Optionally, the bracket that shears is the steel construction bracket that shears.
Optionally, each shear-resistant corbel comprises a side plate, a bottom plate, a rib plate and a plurality of force transmission steel bars arranged at the bottom of the bottom plate, wherein the side plate is perpendicular to the bottom plate, and the rib plate is arranged between the side plate and the bottom plate; each shear-resistant bracket is fixedly connected with the raft plate through the force transmission steel bars embedded in the raft plate; the first steel waist rail is fixedly connected with the side plates of the shearing-resistant corbels.
Through adopting above-mentioned technical scheme, the bracket that shears is lighter than conventional concrete bracket weight, and the installation is demolishd the convenience, can satisfy biography power requirement, guarantees foundation ditch safety.
Optionally, the ribbed slab is a right-angled trapezoid ribbed slab, one side face where the right-angled edge of the ribbed slab is located is fixedly connected with the side plate, and the other side face where the right-angled edge of the ribbed slab is located is fixedly connected with the bottom plate.
Through adopting above-mentioned technical scheme, right trapezoid ribbed slab can satisfy biography power requirement, and material saving reduces the bracket weight that shears, convenient construction.
Optionally, the number of the ribbed plates is multiple, and the ribbed plates are sequentially arranged along the length direction of the bottom plate and have the same interval.
The foundation ditch transmitted force is great, and the single ribbed slab can not satisfy the atress requirement, under the condition that does not influence and pass power and shearing bracket size, through adopting above-mentioned technical scheme to satisfy and pass the power requirement.
Optionally, a bottom plate of the shear-resistant bracket is provided with a plurality of rows of reinforcing steel bar mounting holes for mounting force transmission reinforcing steel bars, and the plurality of rows of reinforcing steel bar mounting holes are respectively and correspondingly arranged at the bottoms or beside the plurality of rib plates; the intervals among the multiple rows of reinforcing steel bar mounting holes are the same.
Through adopting above-mentioned technical scheme, raft reinforcing bar is avoided to multirow reinforcing bar mounting hole to the setting is at the bottom or the next door of a plurality of floor, and it is more direct simple to pass power, avoids shearing the bracket to take place great geometric deformation.
Optionally, the intervals between the steel bar mounting holes in the same row of steel bar mounting holes are the same.
Through adopting above-mentioned technical scheme, each atress of biography power reinforcing bar of bracket that shears is more even.
Optionally, concrete is filled between the second steel wale and the slope protection pile.
Through adopting above-mentioned technical scheme, atress is more even between a plurality of fender slope piles, ensures can the combined action.
Compared with the prior art, the utility model, beneficial effect is:
the utility model discloses an interior supporting structure of foundation ditch can accomplish local deep basal pit and strut the construction under the condition that does not influence raft construction, has solved raft and the mutual problem of influence of the simultaneous cross construction of excavation supporting, has avoided anchor rope construction to leak and has leaked thick liquid and give pollution and the influence that the scene caused, has practiced thrift the time limit for a project.
Drawings
Fig. 1 is the structural schematic diagram of the supporting structure in the foundation pit of the present invention.
Fig. 2 is the structural schematic diagram of the supporting structure in the foundation pit under the overlooking visual angle of the present invention.
Fig. 3 is the utility model discloses an embodiment shearing bracket sets up the schematic diagram on the raft board.
Fig. 4 is a top view of the shearing bracket of the embodiment of the invention.
Fig. 5 is the utility model discloses a top view of shearing bracket uninstallation power transmission steel bar.
Wherein the reference numerals are: 1. a waterproof curtain; 2. slope protection piles; 3. a raft plate; 4. engineering piles; 5. a shear-resistant corbel; 51. a side plate; 52. a base plate; 53. a rib plate; 54. a reinforcing steel bar mounting hole; 6. a first steel wale; 7. a second steel wale; 8. supporting in a steel pipe; 81. activating the head; 9. and (5) locally deep foundation pit.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1 and 2, the supporting and protecting structure in the foundation pit comprises a waterproof curtain 1 arranged on the inner wall of the foundation pit to be supported, a plurality of slope protection piles 2, a raft unit, a first steel waist beam 6, a second steel waist beam 7, a plurality of steel pipe inner supports 8 and a plurality of shearing-resistant corbels 5. The inner wall of the foundation pit to be supported can be the inner wall of one side of the foundation pit close to the building. The waterproof curtain 1 and the slope protection piles 2 are driven into a soil layer before foundation pit excavation.
Referring to fig. 1 and 2, a plurality of slope protection piles 2 are attached to the waterproof curtain 1 and are sequentially arranged along the length direction of the inner wall of the foundation pit. The raft unit is arranged after the foundation pit is dug, the local deep foundation pit 9 is arranged in the foundation pit, the supporting structure is arranged and then is dug, and an example of the local deep foundation pit 9 is an elevator shaft.
Referring to fig. 1 and 2, the raft unit comprises a raft 3 and a plurality of engineering piles 4 for supporting the raft 3, wherein the raft 3 is positioned at the bottom of the foundation pit and is arranged right opposite to the inner wall of the foundation pit; and a plurality of engineering piles 4 go deep into the soil layer in the foundation pit. The range between raft 3 and the inner wall of the foundation pit to be supported is the space dug by local deep foundation pit 9 in the foundation pit.
Referring to fig. 1 and 2, a plurality of shearing-resistant corbels 5 are fixedly arranged at the top of the raft 3 and are sequentially arranged along the length direction of the raft 3.
Referring to fig. 1 and 2, the first steel wale 6 is placed on the raft 3 and clings to the side plates 51 of the plurality of shear-resistant corbels 5; the first steel wale 6 is fixedly connected to the side plates 51 of the plurality of shear brackets 5. The second steel wale 7 is fixedly connected with the plurality of slope protection piles 2 of the side wall of the foundation pit to be supported, and the setting height of the second steel wale 7 is the same as that of the first steel wale 6; the second steel wale 7 and the slope protection pile 2 can be densely filled with fine stone concrete with the strength not lower than C30 or be reliably connected with each other.
Referring to fig. 2, the inner steel pipe supports 8 are sequentially arranged along the length direction of the first steel wale 6 and the second steel wale 7, one end of the inner steel pipe support 8 is provided with a moving head 81, one end of the inner steel pipe support 8 provided with the moving head 81 is pressed against the first steel wale 6, and the other end of the inner steel pipe support 8 is pressed against the second steel wale 7. The steel pipe inner support 8 can be formed by splicing a plurality of steel pipes, and the steel pipes are connected through flanges and bolts.
Referring to fig. 3 and 4, each shear bracket 5 comprises a side plate 51, a bottom plate 52, a rib plate 53 and a plurality of force transmission steel bars arranged at the bottom of the bottom plate 52, wherein the side plate 51 is arranged perpendicular to the bottom plate 52, and the rib plate 53 is arranged between the side plate 51 and the bottom plate 52; rib 53 is right angle trapezoid rib 53, and the quantity of rib 53 is 3, and 3 rib 53 are arranged in proper order and the interval is the same along bottom plate 52 length direction.
Referring to fig. 5, the bottom plate 52 of the shear bracket 5 is further provided with 3 rows of steel bar installation holes 54 for installing force transmission steel bars, and the 3 rows of steel bar installation holes 54 are respectively and correspondingly arranged at the bottoms or beside the 3 rib plates 53; the adjacent two reinforcing bar installation holes 54 in the same row of reinforcing bar installation holes 54 have the same distance therebetween. A plurality of force transmitting rebars are welded at the rebar mounting holes 54 of the force transmitting rebars. During construction, the shearing bracket 5 is fixedly connected with the raft plate 3 through a plurality of force transmission steel bars embedded into the raft plate 3.
The construction process of the supporting structure in the foundation pit comprises the following steps:
1) firstly, the supporting force required for ensuring the safety of the foundation pit needs to be calculated, the counterforce value required by foundation pit support is calculated according to the required supporting force, factors influencing the horizontal bearing capacity and displacement of the engineering piles 4 are comprehensively considered, and the horizontal bearing capacity of the single piles of the engineering piles 4 and the friction force of the raft 3 are calculated, so that the quantity of the engineering piles 4 required for providing counterforce and the area of the raft 3 are determined.
Before the raft unit is constructed, the structural size of the shear-resistant bracket 5 and the number and the length of force transmission reinforcing steel bars are determined according to the required counter force value of foundation pit support.
2) During construction, after parameters such as the number of engineering piles 4, the area of the raft plate 3, the number of force transmission reinforcing steel bars and the length are determined, soil bodies at the edges of local deep foundation pits 9 (elevator shaft) are reserved, soil bodies outside the range of the local deep foundation pits 9 are dug in a basin-shaped mode, raft plate 3 reinforcing steel bars are installed, the force transmission reinforcing steel bars of the shearing-resistant corbels 5 are buried, the shearing-resistant cors 5 are buried in parallel to the edges of the local deep foundation pits 9, the shearing-resistant cors 5 are arranged on a straight line as far as possible to facilitate installation of the first steel waist beams 6, and then raft plate 3 concrete is poured.
3) During the concrete solidification period of the raft units, a first steel waist beam 6 is arranged on the raft 3, and a second steel waist beam 7 is arranged on the foundation pit side wall slope protection pile 2, so that the uniform stress is coordinated, and the combined action is ensured; and a steel pipe inner support 8 is erected between the first steel wale 6 and the second steel wale 7.
4) After the strength of concrete of the raft 3 reaches the design requirement, applying axial prestress to the steel pipe inner support 8, fixing the adjustable head 81 after the prestress is applied in place, and welding and solidifying;
5) excavating residual soil in the range of the local deep foundation pit 9 in a segmented manner, and constructing an underground structure of the residual local deep foundation pit 9;
6) adopt concrete packing closely knit between 9 underground structure of local deep basal pit and slope protection stake 2, after the concrete strength reaches the bearing capacity requirement of trading the brace, demolish interior support of steel pipe 8 and bracket 5 that shears.
Through construction inspection in actual engineering, after inner support supporting is adopted, the deformation of the raft 3 is less than 3mm, the use of the engineering piles 4 and the raft 3 is not influenced, and the operation conditions of the shearing-resistant corbels 5, the steel pipe inner supports 8, the first steel wale 6 and the second steel wale 7 of the steel structure in the construction process are good.
The utility model discloses the supporting principle of supporting structure in the foundation ditch is: support 8 and exert axial prestressing force in the steel pipe through the loose head 81 department that supports 8 in the steel pipe, prestressing force transmits to second steel wale 7, revetment pile 2 through the support counter-force that first steel wale 6, shearing bracket 5, raft 3 and engineering pile 4 provided, plays the effect of strutting to the foundation ditch lateral wall.
Claims (10)
1. The utility model provides an interior supporting structure of foundation ditch, needs the stagnant water curtain (1) of strutting the inner wall including setting up at the foundation ditch, its characterized in that still includes: the raft unit comprises a raft (3) and a plurality of engineering piles (4), wherein the raft (3) is positioned at the bottom of the foundation pit and is opposite to the inner wall of the foundation pit to be supported; the engineering piles (4) are positioned in a foundation pit soil layer and used for supporting the raft plates (3); the range between the raft (3) and the inner wall of the foundation pit to be supported is the digging range of a local deep foundation pit (9) in the foundation pit;
the steel tube inner supports (8) are arranged, and one ends of the steel tube inner supports (8) are provided with movable heads (81); the plurality of steel pipe inner supports (8) are positioned between the raft unit and the inner wall of the foundation pit to be supported, and the two adjacent steel pipe inner supports are axially distributed in parallel;
the first force transmission assembly is fixedly arranged at the raft (3); one end of the steel pipe inner support (8) is propped against the first force transmission component, and the reaction force borne by the steel pipe inner support is transmitted to the engineering pile (4) through the first force transmission component;
the second force transmission assembly is fixedly arranged on the inner wall of the foundation pit to be supported; the other end of the steel pipe inner support (8) is supported against the second force transmission assembly, and the axial prestress received by the steel pipe inner support is transmitted to the inner wall of the foundation pit to be supported through the second force transmission assembly.
2. The in-pit supporting structure according to claim 1, characterized in that:
the first force transfer assembly comprises a plurality of shearing-resistant corbels (5), the shearing-resistant corbels (5) are fixedly arranged at the top of the raft (3) and are sequentially arranged along the length direction of the raft (3);
the first force transmission assembly further comprises a first steel wale (6), the first steel wale (6) is placed on the raft (3) and clings to the plurality of shear-resistant corbels (5), and the first steel wale (6) is fixedly connected with the plurality of shear-resistant corbels (5); one end of the steel pipe inner support (8) is propped against the other side, close to the plurality of shearing-resistant corbels (5), of the first steel waist beam (6).
3. An internal support structure for foundation pits according to claim 1 or 2, characterized in that:
the second force transmission assembly comprises a plurality of slope protection piles (2), the slope protection piles (2) are sequentially arranged along the length direction of the inner wall of the foundation pit to be supported and are tightly attached to the waterproof curtain (1);
the second force transmission assembly is also provided with a second steel wale (7), and the second steel wale (7) is fixedly connected with the plurality of slope protection piles (2); the other end of the steel pipe inner support (8) is propped against one side, far away from the multiple slope protection piles (2), of the second steel waist beam (7).
4. An internal support structure for foundation pits according to claim 2, characterized in that:
the shearing-resistant bracket (5) is a steel-structure shearing-resistant bracket.
5. An internal support structure for foundation pits according to claim 4, characterized in that:
the shear-resistant bracket (5) comprises a side plate (51), a bottom plate (52), a rib plate (53) and a plurality of force transmission steel bars arranged at the bottom of the bottom plate (52), wherein the side plate (51) is perpendicular to the bottom plate (52), and the rib plate (53) is arranged between the side plate (51) and the bottom plate (52);
each shear-resistant corbel (5) is fixedly connected with the raft plate (3) through the force transmission steel bars embedded into the raft plate (3);
the first steel wale (6) is fixedly connected with the side plates (51) of the shearing-resistant corbels (5).
6. The in-pit supporting structure according to claim 5, wherein:
the rib plate (53) is a right-angle trapezoidal rib plate (53), one side face where the right-angle side of the rib plate (53) is located is fixedly connected with the side plate (51), and the other side face where the right-angle side of the rib plate (53) is located is fixedly connected with the bottom plate (52).
7. The in-pit supporting structure according to claim 6, wherein:
the number of the rib plates (53) is multiple, and the plurality of rib plates (53) are sequentially arranged along the length direction of the bottom plate (52) at the same interval.
8. An internal support structure for foundation pits according to claim 7, characterized in that:
a bottom plate (52) of the shear-resistant bracket (5) is provided with a plurality of rows of steel bar mounting holes (54) for mounting force transmission steel bars, and the plurality of rows of steel bar mounting holes (54) are respectively and correspondingly arranged at the bottoms or the sides of the plurality of rib plates (53); the intervals among the rows of reinforcing steel bar mounting holes (54) are the same.
9. The in-pit supporting structure according to claim 8, characterized in that:
the intervals among the steel bar mounting holes (54) in the same row of the steel bar mounting holes (54) are the same.
10. An internal support structure for foundation pits according to claim 3, characterized in that:
concrete is filled between the second steel wale (7) and the slope protection pile (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221130409.1U CN217399672U (en) | 2022-05-11 | 2022-05-11 | Supporting and protecting structure in foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221130409.1U CN217399672U (en) | 2022-05-11 | 2022-05-11 | Supporting and protecting structure in foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217399672U true CN217399672U (en) | 2022-09-09 |
Family
ID=83145163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221130409.1U Active CN217399672U (en) | 2022-05-11 | 2022-05-11 | Supporting and protecting structure in foundation pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217399672U (en) |
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2022
- 2022-05-11 CN CN202221130409.1U patent/CN217399672U/en active Active
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