CN211498975U - Anti structure of floating of shallow earthing underground structure - Google Patents

Anti structure of floating of shallow earthing underground structure Download PDF

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Publication number
CN211498975U
CN211498975U CN202020014533.6U CN202020014533U CN211498975U CN 211498975 U CN211498975 U CN 211498975U CN 202020014533 U CN202020014533 U CN 202020014533U CN 211498975 U CN211498975 U CN 211498975U
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China
Prior art keywords
floating
roof
underground
plate
fender pile
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CN202020014533.6U
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Chinese (zh)
Inventor
王雷
彭琦
罗毅
唐超华
黄夏寅
贺亚思
丘锦山
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Shenzhen Municipal Design and Research Institute Co Ltd
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Shenzhen Municipal Design and Research Institute Co Ltd
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Abstract

The utility model discloses an anti structure of floating of shallow earthing underground structure, side wall including local thickening, fender pile and anti superficial roof beam, fender pile position pre-buried anti superficial roof beam bending reinforcing bar above the bottom plate, anti superficial roof beam bending reinforcing bar be located between fender pile's the spiral muscle and the stiffening hoop and with fender pile owner muscle welding, anti superficial roof beam bending reinforcing bar department has pour anti superficial roof beam, and the hole wall plain concrete has been pour to anti superficial roof beam top, and the interior segmentation of fender pile is executed with the tunnel side wall above the bottom plate, medium plate and roof. The utility model has the advantages that the space is not required to be added at the top of the structure, and the two sides of the structure are only required to be overhung outwards, so that the excavation width and the retaining range of the foundation pit with increased construction floating-resistant toes are greatly reduced, and the construction cost is reduced; the thickness of the local side wall of the underground structure is increased by utilizing the waist beam anti-floating design, so that the checking calculation of corner bending moment and shearing force is facilitated, and local reinforcement can be reduced; the side wall and the anti-floating beam are locally thickened at the top plate position, pressure is transmitted through plain concrete, and the function of controlling sedimentation can be achieved when the foundation is not uniformly settled.

Description

Anti structure of floating of shallow earthing underground structure
Technical Field
The utility model relates to an underground structure engineering technical field especially relates to a shallow earthing underground structure's anti structure of floating.
Background
Along with the continuous development of urban construction, the development and construction of urban underground spaces are increasingly emphasized, and various underground projects such as comprehensive pipe galleries, urban underground loops, vehicle-mounted communication channels, street crossing underpasses and the like are continuously increased in many cities. In order to reduce the construction cost, underground engineering construction generally adopts shallow burying as much as possible. Underground structure engineering, especially utility tunnel feeding, ejection of compact, ventilation, node such as flee often meet the operating mode that the earthing is shallower in the design. In the higher area of groundwater water level, because structural earthing light in weight, utility tunnel structure cavity is great, and the structure dead weight often can not satisfy anti requirement of floating, and underground structure's anti problem of floating is more outstanding this moment, needs to adopt anti measure of floating.
The anti-floating measures commonly adopted in the current underground engineering include the arrangement of anti-pulling piles, the arrangement of capping beams, the arrangement of anti-floating toes, the increase of soil covering depth and the like. The uplift pile is a pile which is arranged on a bottom plate of an underground structure and resists vertical water buoyancy by means of the self weight of a pile body and the friction force between the pile body and a soil layer. The capping beam is a beam which is arranged at the top of the structure and connected with the fender pile, and can resist water buoyancy by using the self weight of the fender structure. The anti-floating toes are cantilever plate structures extending out horizontally from two side edges of the structure, and soil is backfilled or bricks are laid on the anti-floating toes to increase the dead weight of the structure and resist buoyancy.
The anti-pulling pile or the anti-floating anchor rod is arranged to change the stress mode of the main structure, the structural bottom plate is stressed intensively, and partial water leakage of the pile head part is easily caused; the construction cost and the construction period are also increased by driving the anti-pulling pile or the anti-floating anchor rod; the uplift pile is generally long in length, occupies an underground space, and is not beneficial to development of the underground space. The soil covering depth of the joints such as the feeding port of the comprehensive pipe gallery, the personnel entrance and exit is shallow, and the joint can only be used as a pavement structure surface layer and can be used as a capping beam unconditionally. Anti-floating toes are arranged on an underground structure with shallow soil covering and large structural span, and generally need to be cantilevered outwards at two side edges of the structure for a long distance (generally more than 1 m), so that the excavation width of a foundation pit needs to be increased, the construction enclosure range is widened, and the construction cost is increased; to the utility tunnel along with road laying, set up anti floating toe and can occupy more lanes, it is big to the road surface traffic influence, increase and relieve pressure, also can arouse simultaneously that more pipelines move to change.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a shallow earthing underground structure's anti structure of floating to solve above-mentioned prior art and have large-span such as utility tunnel node, shallow earthing underground structure's anti problem of floating, overcome current anti technological measure of floating: the uplift pile and the anti-floating anchor rod have high cost and difficult construction; only the anti-floating toes are adopted, so that the occupied area is large, the excavated earth volume is large, the construction cost is high, and the pipeline moving and changing and the traffic fluffing can be caused; difficult problems that the capping beam can not be arranged under the condition of shallow soil covering and the like. The utility model discloses the anti foundation ditch excavation width that floats the toe and increase of greatly reduced construction with enclose the fender scope to reduce construction cost and traffic pressure of reliving.
In order to achieve the above object, the utility model provides a following scheme: the utility model provides an anti structure of floating of shallow earthing underground structure, side wall, fender pile and anti floating beam including local thickening, pre-buried anti floating beam bending reinforcement above the bottom plate, anti floating beam bending reinforcement is located between fender pile's spiral muscle and the stiffening hoop and with fender pile owner muscle welding, anti floating beam bending reinforcement department has pour anti floating beam, hole wall plain concrete has been pour to anti floating beam top, tunnel side wall, medium plate and roof have been executed to the subsection in the fender pile above the bottom plate.
Preferably, the height from the bottom plate to the anti-floating beam bending steel bar is adjustable.
Preferably, micro-expansion concrete is injected between the lower parts of the two sides of the top plate and the pitted wall plain concrete.
The construction method of the anti-floating structure of the shallow soil-covered underground structure comprises the following steps:
1) the construction of the steel reinforcement cage of the fender pile comprises the following steps: when the enclosure pile reinforcement cage is manufactured, anti-floating beam bending reinforcements are pre-embedded at the position 1.5m above a tunnel bottom plate, and the bending reinforcements are positioned between the enclosure pile spiral reinforcements and the stiffening hoops and are welded with the enclosure pile main reinforcements;
2) driving a fender post, arranging an upper support and a lower support, excavating earthwork to the bottom of the foundation pit, and constructing a bottom plate cushion layer;
3) binding a bottom plate reinforcing steel bar, and pouring the bottom plate in sections;
4) removing the second support, chiseling concrete on the surface of the fender post at the position of the embedded anti-floating beam steel bar, straightening the embedded steel bar of the anti-floating beam, and chiseling the concrete around the embedded steel bar; pouring anti-floating beams and pit wall plain concrete;
5) using anti-floating beams and pit wall plain concrete as templates, and constructing tunnel side walls and middle plates in sections;
6) removing the first support, constructing a tunnel top plate in sections, and injecting micro-expansion concrete between the lower side of the top plate and the pit wall plain concrete to make the top plate and the pit wall plain concrete closely attached;
7) and applying the pavement to restore traffic.
The utility model discloses for prior art gain following technological effect:
the utility model discloses anti structure of floating of well shallow earthing underground structure, its make full use of be used for the fender pile of excavation supporting to carry out the anti of underground structure and float. Compare and beat and establish anti-floating pile or anti-floating anchor rod, the utility model discloses reducible construction cost and time limit for a project also do not arouse local percolating water problem easily with processing anti-floating pile head portion. Compare and set up the capping beam, the utility model discloses need not to increase the space at the structure top, application scope is wider under shallow earthing operating mode. Compare and set up anti toe that floats, the utility model discloses only need outwards encorbelment at structure both sides limit and stretch out 20-30cm, the anti toe that floats of greatly reduced construction increases the foundation ditch excavation width with enclose and keep off the scope to reduce construction cost and traffic pressure of reliving.
The thickness of the local side wall of the underground structure is increased by utilizing the waist beam anti-floating design, so that the checking calculation of corner bending moment and shearing force is facilitated, the local reinforcement can be reduced, and the construction cost is reduced.
The side wall and the anti-floating beam are locally thickened at the top plate position, pressure is transmitted through plain concrete, and the function of controlling sedimentation can be achieved when the foundation is not uniformly settled. (the bearing capacity of the foundation meets the requirement, when the settlement does not need to be controlled, the underground top beam anti-floating beam can be arranged, the size of the top beam is increased, the fender post is protruded by 20-30cm, and the other parts are arranged with the waist beam anti-floating beam, as shown in figure 9)
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a top view of a fender post;
FIG. 2 is a schematic view showing a positional relationship between the fender post at the position A in FIG. 1 and the embedded steel bars of the waist floating-resisting beam;
FIG. 3 is a structural diagram of pre-embedded steel bars of an anti-floating beam;
FIG. 4 is a schematic view of a fender post being driven and two supports being provided;
FIG. 5 is a schematic view with the second support removed;
FIG. 6 is a schematic view of an anti-floating beam;
FIG. 7 is a schematic view with the first support removed;
FIG. 8 is a schematic view of the internal distribution of the underground wale anti-floating structure after being constructed as a road surface;
FIG. 9 is a schematic view of the internal distribution of the underground crown beam anti-floating structure after construction as a road surface;
wherein, 1, a main reinforcement of the fender post is enclosed; 2, spiral ribs; 3, enclosing piles; 4, a stiffening hoop; 5, pre-embedding reinforcing steel bars into the anti-floating beam; 6, first supporting; 7, second supporting; 8, a bottom plate; 9, resisting a floating beam; 10 pit wall plain concrete; 11, breaking off the pre-embedded steel bars of the straight anti-floating beam; 12 micro-expansive concrete.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a shallow earthing underground structure's anti structure of floating to solve above-mentioned prior art and have large-span such as utility tunnel node, shallow earthing underground structure's anti problem of floating, overcome current anti technological measure of floating: the uplift pile and the anti-floating anchor rod have high cost and difficult construction; only the anti-floating toes are adopted, so that the occupied area is large, the excavated earth volume is large, the construction cost is high, and the pipeline moving and changing and the traffic fluffing can be caused; difficult problems that the capping beam can not be arranged under the condition of shallow soil covering and the like. The utility model discloses the anti foundation ditch excavation width that floats the toe and increase of greatly reduced construction with enclose the fender scope to reduce construction cost and traffic pressure of reliving.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1-9, the utility model provides an anti structure of floating of shallow earthing underground structure of large-span, the construction method of this structure specifically includes following step:
1. waist floating beam resistance: waist anti-floating beam and major structure top, 8 laminating of bottom plates through the resistance to compression contact, can not destroy major structure outside waterproof layer. The arrangement can not only solve the problem of structural anti-floating, but also utilize the anti-floating beam 9 to control the settlement when the bearing capacity of the foundation at the bottom of the foundation is not satisfied, thereby solving the problem of the bearing capacity of part of the foundation.
(1) The construction of the steel reinforcement cage of the fender pile comprises the following steps: when the guard pile reinforcement cage is manufactured, the anti-floating beam bending reinforcement is pre-embedded at the position about 1.5m above the tunnel bottom plate 8, and the height B can be adjusted as required. The bent reinforcing steel bar is positioned between the fender pile spiral rib 2 and the stiffening hoops 4 and is welded with the fender pile main rib 1.
(2) According to a conventional method, the fender post 3 is arranged, the support is arranged, the earthwork is excavated to the bottom of the foundation pit, and the bottom plate cushion is constructed.
(3) And (3) binding the reinforcing steel bars of the bottom plate, and pouring the bottom plate 8 in sections (generally 8-10 m).
(4) Removing the second support 7, chiseling concrete on the surface of the fender post 3 at the position of the anti-floating beam embedded steel bar 5, straightening the anti-floating beam embedded steel bar 11, and chiseling the concrete around the embedded steel bar; and pouring plain concrete of the anti-floating beam 9 and the pit wall C20.
(5) Using anti-floating beams 9 and pit wall plain concrete 10 as templates, and constructing tunnel side walls and middle plates (generally 8-10m) in sections;
(6) the first support 6 is removed, a tunnel roof (generally 8-10m) is constructed in sections, and micro-expansion concrete 12 is injected between the lower side of the roof and the pit wall plain concrete 10 to make the roof and the pit wall plain concrete closely attached.
(7) And applying the pavement to restore traffic.
2. Crown beam floating beam resistance: for the underground structure with the foundation bearing capacity meeting the requirement, the crown beam floating resisting beam can be adopted for resisting floating.
Compared with the waist beam anti-floating beam, the crown beam anti-floating beam only needs to increase the size of the crown beam, and the rest of the arrangement is the same.
The utility model discloses an anti structure of floating for shallow earthing underground structure, its advantage make full use of the fender pile that is used for excavation supporting carries out the anti of underground structure and floats. Compare and beat and establish anti-floating pile or anti-floating anchor rod, the utility model discloses reducible construction cost and time limit for a project also do not arouse local percolating water problem easily with processing anti-floating pile head portion. Compare and set up the capping beam, the utility model discloses need not to increase the space at the structure top, application scope is wider under shallow earthing operating mode. Compare and set up anti toe that floats, the utility model discloses only need outwards encorbelment at structure both sides limit and stretch out 20-30cm, the anti toe that floats of greatly reduced construction increases the foundation ditch excavation width with enclose and keep off the scope to reduce construction cost and traffic pressure of reliving.
The thickness of the local side wall of the underground structure is increased by utilizing the waist beam anti-floating design, so that the checking calculation of corner bending moment and shearing force is facilitated, the local reinforcement can be reduced, and the construction cost is reduced.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims (3)

1. The utility model provides an anti structure of floating of shallow earthing underground structure which characterized in that: including the side wall of local thickening, fender pile and anti floating beam, the pre-buried anti floating beam reinforcing bar of buckling in fender pile position above the bottom plate, anti floating beam reinforcing bar of buckling is located between fender pile's spiral muscle and the stiffening hoop and with fender pile owner muscle welding, anti floating beam reinforcing bar department of buckling has pour anti floating beam, the hole wall plain concrete has been pour to anti floating beam top, tunnel side wall, medium plate and roof have been executed to the segmentation in the fender pile above the bottom plate.
2. The anti-floating structure of a shallow soil-covered underground structure of claim 1, wherein: the height from the bottom plate to the anti-floating beam bending steel bar is adjustable.
3. The anti-floating structure of a shallow soil-covered underground structure of claim 1, wherein: micro-expansion concrete is injected between the lower parts of the two sides of the top plate and the pit wall plain concrete.
CN202020014533.6U 2020-01-06 2020-01-06 Anti structure of floating of shallow earthing underground structure Active CN211498975U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020014533.6U CN211498975U (en) 2020-01-06 2020-01-06 Anti structure of floating of shallow earthing underground structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020014533.6U CN211498975U (en) 2020-01-06 2020-01-06 Anti structure of floating of shallow earthing underground structure

Publications (1)

Publication Number Publication Date
CN211498975U true CN211498975U (en) 2020-09-15

Family

ID=72398521

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020014533.6U Active CN211498975U (en) 2020-01-06 2020-01-06 Anti structure of floating of shallow earthing underground structure

Country Status (1)

Country Link
CN (1) CN211498975U (en)

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