CN217105109U - Supporting construction of deep basal pit synchronous construction under people's foot bridge - Google Patents
Supporting construction of deep basal pit synchronous construction under people's foot bridge Download PDFInfo
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- CN217105109U CN217105109U CN202121316786.XU CN202121316786U CN217105109U CN 217105109 U CN217105109 U CN 217105109U CN 202121316786 U CN202121316786 U CN 202121316786U CN 217105109 U CN217105109 U CN 217105109U
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Abstract
The utility model provides a supporting construction of deep basal pit synchronous construction under pedestrian overpass, including the original cushion cap of a plurality of pedestrian overpasses, the original cushion cap inside of pedestrian overpass has original bridge pile, the original cushion cap top of pedestrian overpass sets up pedestrian overpass superstructure, its characterized in that: including a plurality of deep basal pits that set up side by side, set up cushion cap protection architecture around the original cushion cap of pedestrian overpass that is close to deep basal pit to set up cushion cap expansion structure in the both sides of the original cushion cap of pedestrian overpass, the both sides limit of deep basal pit sets up second foundation ditch fender post, sets up bearing structure between the second foundation ditch fender post. The utility model discloses pedestrian overpass security performance when not only having improved the synchronous construction of polybase hole has shortened construction cycle moreover, has guaranteed construction convenience and economic nature.
Description
Technical Field
The utility model relates to a foundation ditch support engineering technical field, concretely relates to supporting construction of deep basal pit synchronous construction under pedestrian overpass.
Background
Under the background of accelerating the progress of novel urbanization, urban public facility construction is developed on a large scale, and the trend of greatly improving urban service capability becomes a mainstream trend. At present, municipal infrastructure is mostly constructed by an open cut method, a deep and large foundation pit needs to be excavated along the trend of the current ground road, and certain influence is inevitably caused on building structures around the road. Along with the continuous increase of municipal infrastructure construction strength, the condition that multiple projects such as urban tunnels, underground ramps, utility tunnels and the like are constructed simultaneously gradually appears, the influence problem of excavation unloading to adjacent structures is changed from a single foundation pit to a plurality of foundation pits, the mechanical mechanism is more complicated, and the control difficulty is more difficult.
Construction of a plurality of deep foundation pits simultaneously penetrating through pedestrian overpasses is a new phenomenon under the overall construction of municipal infrastructure. The influence of excavation of a plurality of deep foundation pits on the pedestrian overpass is mainly reflected in the side frictional resistance loss of a plurality of pile foundations and the additional lateral displacement and bending moment accumulation of the pile foundations in different degrees. When the local pile foundation bearing capacity of the pedestrian overpass is insufficient, the uneven settlement and even collapse of the upper structure are easily caused, and when the additional lateral displacement and the bending moment of the local pile foundation exceed the limit bearing capacity, the overall instability and damage of the pedestrian overpass can be caused. Therefore, unless the old bridge is dismantled, certain protective and reinforcing measures such as foundation grouting, pile foundation underpinning, temporary supporting, reinforcement monitoring and the like must be taken when the multiple foundation pits pass through the pedestrian overpass. Generally, the construction method for enabling most foundation pits to penetrate through the pedestrian overpass at present is a safe, reliable, economical and applicable construction method for complex conditions that a plurality of deep foundation pits simultaneously penetrate through the pedestrian overpass for construction aiming at a single deep foundation pit.
SUMMERY OF THE UTILITY MODEL
To the not enough of existence among the prior art, the utility model aims to provide a supporting construction of deep basal pit synchronous construction under people's walking overpass. The utility model discloses pedestrian overpass security performance when not only having improved the synchronous construction of polybase hole has shortened construction cycle moreover, has guaranteed construction convenience and economic nature.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
the utility model provides a supporting construction of deep basal pit synchronous construction under people's foot bridge which characterized in that: the novel bridge comprises a plurality of original bearing platforms of pedestrian overpasses, original bridge piles are arranged inside the original bearing platforms of the pedestrian overpasses, pedestrian overpass upper structures are arranged above the original bearing platforms of the pedestrian overpasses, bearing platform protection structures are arranged around the original bearing platforms of the pedestrian overpasses close to deep foundation pits, and bearing platform expansion structures are arranged on two sides of the original bearing platforms of the pedestrian overpasses.
And further: and arranging grouting reinforcement water stop bodies in soil bodies below the earth surface at the inner side of the bearing platform protection structure.
Further: the protection scope of cushion cap protection architecture is the rectangle setting, and cushion cap protection architecture is including setting up the first foundation ditch fender pile around the original cushion cap of pedestrian overpass, the both sides limit of deep basal pit sets up second foundation ditch fender pile, sets up bearing structure between the second foundation ditch fender pile.
Further: two rows of first foundation pit fender piles of the cushion cap protection structure parallel to the trend of the deep foundation pit are arranged on the outer side of the original cushion cap of the pedestrian overpass, and the distance between the two rows of first foundation pit fender piles and the original cushion cap of the pedestrian overpass is 0.5-4.0 times of the diameter of the first foundation pit fender piles.
Further: two rows of first foundation pit fender piles of the cushion cap protection structure perpendicular to the trend of the deep foundation pit are arranged on the outer side of the projection range of the upper structure of the pedestrian overpass, and the distance between the two rows of first foundation pit fender piles and the projection range of the upper structure of the pedestrian overpass is 1.5-2.5 times of the diameter of the first foundation pit fender piles.
Further: the cushion cap enlarges the structure and is cross symmetrical arrangement's newly-built bridge pile including setting up two inboard with original bridge pile in cushion cap protection architecture, the both sides wall of the original cushion cap of pedestrian overpass is connected with cushion cap planting muscle to through cushion cap planting muscle to the cushion cap owner muscle of the newly-built cushion cap of the external connection of the original cushion cap of pedestrian overpass, the cushion cap owner muscle of newly-built cushion cap, the original cushion cap of pedestrian overpass and newly-built bridge pile concreting connect as a whole, constitute newly-built cushion cap.
Further: the side of the original bearing platform of the pedestrian bridge is provided with a plurality of rows of mortises which are arranged at intervals, and the mortises and the centers of two adjacent mortises are provided with the bearing platform embedded bars.
Further: the side of second foundation ditch fender pile sets up foundation ditch stagnant water stake, second foundation ditch fender pile and foundation ditch stagnant water stake avoid cushion cap protection architecture to set up.
Further: the supporting structure comprises a plurality of steel supports, the steel supports are arranged at intervals along the depth direction of the deep foundation pit and the length direction of the deep foundation pit, and two ends of each steel support are connected with a first foundation pit fender pile or a second foundation pit fender pile on two sides of the deep foundation pit through steel purlins.
Further: the top and the below of connecting the steel purlin on the second foundation ditch fender pile are equallyd divide and are do not set up a pair of nose girder, the nose girder is connected many second foundation ditch fender piles in the length direction of deep basal pit, and a pair of nose girder symmetry sets up the both sides at the second foundation ditch fender pile, and a pair of nose girder wears to establish the counter-pull screw rod in the position of second foundation ditch fender pile to connect through the counter-pull nut.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model greatly improves the vertical bearing capacity and the lateral deformation resistance of the pedestrian overpass in the multi-base pit excavation process, counteracts the adverse effect caused by large-range foundation pit unloading to a certain extent, reduces the differential settlement among the piers of the pedestrian overpass caused by construction, and ensures that the pedestrian overpass can normally operate when the foundation pit is constructed;
2. the construction period is short, and the excavation of a plurality of deep foundation pits under the pedestrian overpass and the construction of a main body structure are guaranteed to be completed in the shortest time;
3. a plurality of deep basal pit constructions all can adopt conventional mode of strutting, and mutual interference is little, has improved the construction convenience, does benefit to the allotment of construction resources simultaneously, improves construction machinery's rate of utilization, and economic benefits is good.
Drawings
Fig. 1 is a schematic plan view of the present invention;
fig. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is a partial enlarged view of the connection relationship between the original bearing platform and the enlarged bearing platform, and between the newly-built bridge pile and the opposite-pulling reinforcing steel bars.
Reference numerals: 1. the foundation pit comprises a first foundation pit, a second foundation pit, a third foundation pit, a 4-pedestrian overpass superstructure, a 5-pedestrian overpass pier, a 6-pedestrian overpass original cushion cap, a 7-original bridge pile, a 8-cushion cap expanding structure, a 9-newly-built bridge pile, a 10-first foundation pit fender pile, a 11-foundation pit water stop pile, a 12-grouting reinforcement water stop body, a 13-crown beam, a 14-concrete support column, a 15-steel support, a 16-steel purlin, a 17-temporary steel pipe column, an 18-tongue-and-groove, a 19-cushion cap planting bar, a 20-cushion cap main bar of the newly-built cushion cap, a 21-counter-pull screw rod, a 22-counter-pull screw cap, a 23-guide beam and a 24-second foundation pit fender pile.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following preferred embodiments of the present invention are described with reference to specific examples, but it should be understood that the drawings are for illustrative purposes only and are not to be construed as limiting the present invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
The present invention will be further described with reference to the drawings and examples, which should not be construed as a limitation to the present invention.
As shown in fig. 1 to 3, a supporting construction of deep basal pit synchronous construction under pedestrian overpass, including the original cushion cap 6 of a plurality of pedestrian overpasses, the original cushion cap 6 of pedestrian overpass is inside to have original bridge pile 7, the original cushion cap 6 top of pedestrian overpass sets up pedestrian overpass superstructure 4, deep basal pit is including a plurality of deep basal pits (three deep basal pit has been arranged to the list in this embodiment, is foundation pit 1, No. two foundation pits 2 and No. three foundation pits 3 respectively), and the excavation depth difference of different deep basal pits is not more than 30cm, sets up cushion cap protection architecture around the original cushion cap 6 of pedestrian overpass near deep basal pit to set up cushion cap expansion structure 8 in the both sides of the original cushion cap 6 of pedestrian overpass, the both sides limit of deep basal pit sets up second foundation pit fender pile 24, sets up bearing structure between the second foundation pit fender pile 24.
And a grouting reinforcement water stopping body 12 is arranged on the soil body below the earth surface at the inner side of the bearing platform protection structure. Sleeve valve pipe grouting is carried out on soil below the earth surface on the inner side of the bearing platform protection structure, the strength and impermeability of soil around an original bearing platform 6 and an original bridge pile 7 of the pedestrian overpass are improved, the grouting depth is 1m below a strongly weathered rock layer, the bearing capacity of a foundation is not less than 150kPa after 28 days of grouting, and the unconfined compressive strength is not less than 0.8 MPa.
The protection scope of the bearing platform protection structure is rectangular, and the bearing platform protection structure comprises first foundation pit fender piles 10 arranged around the original bearing platform 6 of the pedestrian overpass. The diameter of the first foundation pit fender post 10 is calculated according to the depth of the deep foundation pit and geological conditions, and is selected within the range of 0.8-1.2 m.
Two rows of first foundation pit fender piles 10 of the pile cap protection structure parallel to the trend of the deep foundation pit are arranged on the outer side of the original pile cap 6 of the pedestrian overpass, and the distance between the pile cap protection structure and the original pile cap 6 of the pedestrian overpass is 0.5-4.0 times of the diameter of the first foundation pit fender piles 10.
Two rows of first foundation pit fender piles 10 of the cushion cap protection structure perpendicular to the trend of the deep foundation pit are arranged outside the projection range of the pedestrian overpass upper structure 4, and the distance between the projection range of the cushion cap protection structure and the projection range of the pedestrian overpass upper structure 4 is 1.5-2.5 times of the diameter of the first foundation pit fender piles 10. When the distance from the original bearing platform 6 of the pedestrian overpass to the side line of the adjacent deep foundation pit exceeds 4.0 times of the diameter of the foundation pit fender pile, the original bearing platform 6 of the pedestrian overpass is sealed without adopting the foundation pit fender pile.
The cushion cap enlarges structure 8 and is cross symmetrical arrangement's newly-built bridge pile 9 including setting up two and original bridge pile 7 at cushion cap protection architecture inboard, the both sides wall of the original cushion cap 6 of pedestrian overpass is connected with cushion cap bar planting 19 to through cushion cap bar planting 19 to the cushion cap owner muscle 20 of the newly-built cushion cap of the external connection of the original cushion cap 6 of pedestrian overpass, the cushion cap owner muscle 20 of the newly-built cushion cap, the original cushion cap 6 of pedestrian overpass and newly-built bridge pile 9 concreting connect as a whole, constitute newly-built cushion cap.
The distance from the newly-built bridge pile 9 to the edge of the original bearing platform 6 of the pedestrian overpass is not more than 2.0 times of the diameter of the first foundation pit fender pile 10, so as to ensure the balance stress of the pile group foundation after the construction of the bearing platform expanding structure 8, and the length of the newly-built bridge pile 9 is determined according to the length of the first foundation pit fender pile 10 adjacent to the deeper foundation pit; when the minimum horizontal distance between the first foundation pit fender pile 10 and the original bearing platform 6 of the pedestrian overpass is smaller than 2.0 times of the diameter of the foundation pit fender pile 10, selecting the appointed first foundation pit fender pile 10 to be used as a newly-built bridge pile 9, or else, additionally constructing the newly-built bridge pile 9 on the inner side of the bearing platform protection structure.
The side of the original cushion cap 6 of passenger foot bridge is dug the tongue-and-groove 18 of multirow interval arrangement, and the degree of depth of tongue-and-groove 18 is 20 ~ 40mm, avoids damaging the cushion cap owner muscle in the original cushion cap during the tongue-and-groove 18 of digging, the center department of tongue-and-groove 18 and two adjacent tongue-and-groove 18 is beaten and is established cushion cap bar planting 19. The height of the mortises 18 is the same as the vertical spacing of the main ribs of the bearing platform, generally controlled to be 150-200 mm, and the vertical spacing of the mortises 18 is controlled to be 2.0 times of the height of the mortises. And after the structural strength of the bearing platform enlarged structure 8 meets the design requirement, backfilling the soil body around the bearing platform enlarged structure 8 to the ground surface and rolling and compacting, wherein the backfilled soil is clay, and the rolling compaction degree is not less than 95%.
The side of second foundation ditch fender pile 24 sets up foundation ditch stagnant water stake 11, second foundation ditch fender pile 24 and foundation ditch stagnant water stake 11 avoid cushion cap protection architecture to set up. After the second foundation pit fender pile 24 and the foundation pit water stop pile 11 of the first foundation pit 1, the second foundation pit 2 and the third foundation pit 3 are constructed, constructing the crown beam 13 and the concrete support column 14; the intersection of the crown beam 13 and the bearing platform expanding structure 8 ensures that the length of the stressed steel bar of the crown beam 13 extending into the bearing platform expanding structure 8 meets the requirement of anchoring length.
A vertical temporary steel pipe column 17 is arranged between the bearing platform expanding structure 88 and the pedestrian overpass upper structure 4, and the temporary steel pipe column 17 is
Or
The top of the steel pipe is provided with an axial force servo system capable of performing double control of oil pressure and stroke, the deformation and settlement monitoring of the upper structure 4 of the pedestrian overpass are enhanced during construction, and an emergency plan is made.
The supporting structure comprises a plurality of steel supports 15, the steel supports 15 are arranged at intervals along the depth direction of the deep foundation pit and the length direction of the deep foundation pit, and two ends of each steel support 15 are connected with a first foundation pit fender pile 10 or a second foundation pit fender pile 24 on two sides of the deep foundation pit through steel purlins 16. And the difference of erection elevations of each steel support 15 of different deep foundation pits is not more than 30 cm.
The position of 20 ~ 30cm below and the top of connecting steel purlin 16 on second foundation ditch fender pile 24 is equallyd divide and is set up a pair of nose girder 23 respectively, nose girder 23 connects many second foundation ditch fender piles 24 in the length direction of deep basal pit, a pair of nose girder 23 symmetry sets up the both sides at second foundation ditch fender pile 24, a pair of nose girder 23 wears to establish counter-pulling screw 21 in the position of second foundation ditch fender pile 24, and the diameter of counter-pulling screw 21 is 28mm to connect through counter-pulling nut 22, bearing structure can strengthen the restraint to pedestrian overpass substructure, accomplish many foundation ditches synchronous constructions under the pedestrian overpass from this.
According to the utility model discloses a description and attached drawing, the field technical staff makes or uses very easily the utility model discloses a supporting construction of deep basal pit synchronous construction under pedestrian overpass to can produce the positive effect that the utility model discloses record.
The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention in any form, and all the technical matters of the present invention are all within the protection scope of the present invention for any simple modification and equivalent change of the above embodiments.
Claims (10)
1. The utility model provides a supporting construction of deep basal pit synchronous construction under people's foot bridge which characterized in that: including original cushion cap (6) of a plurality of pedestrian overpasses, original bridge pile (7) have inside original cushion cap (6) of pedestrian overpass, original cushion cap (6) top of pedestrian overpass sets up pedestrian overpass superstructure (4), sets up cushion cap protection architecture around original cushion cap (6) of pedestrian overpass near deep basal pit to set up cushion cap expansion structure (8) in the both sides of original cushion cap (6) of pedestrian overpass.
2. The supporting structure for the synchronous construction of the deep foundation pit under the pedestrian overpass of claim 1, which is characterized in that: and a grouting reinforcement water stopping body (12) is arranged on the soil body below the earth surface at the inner side of the bearing platform protection structure.
3. The supporting structure for the synchronous construction of the deep foundation pit under the pedestrian overpass of claim 1, which is characterized in that: the protection scope of cushion cap protection architecture is the rectangle setting, and cushion cap protection architecture is including setting up first foundation ditch fender pile (10) around original cushion cap (6) of pedestrian overpass, the both sides limit of deep basal pit sets up second foundation ditch fender pile (24), sets up bearing structure between second foundation ditch fender pile (24).
4. The supporting structure for the synchronous construction of the deep foundation pit under the pedestrian overpass of claim 3, wherein: two rows of first foundation pit fender piles (10) of the cushion cap protection structure parallel to the trend of the deep foundation pit are arranged on the outer side of the original cushion cap (6) of the pedestrian overpass, and the distance between the two rows of first foundation pit fender piles and the original cushion cap (6) of the pedestrian overpass is 0.5-4.0 times of the diameter of the first foundation pit fender piles (10).
5. The supporting structure for the synchronous construction of the deep foundation pit under the pedestrian overpass of claim 3, wherein: two rows of first foundation pit fender piles (10) of the cushion cap protection structure perpendicular to the trend of the deep foundation pit are arranged on the outer side of the projection range of the pedestrian overpass upper structure (4), and the distance between the cushion cap protection structure and the projection range of the pedestrian overpass upper structure (4) is 1.5-2.5 times of the diameter of the first foundation pit fender piles (10).
6. The supporting structure for the synchronous construction of the deep foundation pit under the pedestrian overpass of claim 1, which is characterized in that: cushion cap enlarges structure (8) and is cross symmetrical arrangement's newly-built bridge pile (9) including setting up two inboard with original bridge pile (7) in cushion cap protection architecture, the both sides wall of the original cushion cap of pedestrian overpass (6) is connected with cushion cap bar planting (19) to cushion cap owner muscle (20) of the newly-built cushion cap of the external connection of the original cushion cap of pedestrian overpass (6) through cushion cap bar planting (19), the cushion cap owner muscle (20) of the newly-built cushion cap, the original cushion cap of pedestrian overpass (6) and newly-built bridge pile (9) pour the concrete and connect as a whole, constitute newly-built cushion cap.
7. The supporting structure for the synchronous construction of the deep foundation pit under the pedestrian overpass of claim 6, wherein: the side of the original bearing platform (6) of the pedestrian bridge is provided with a plurality of rows of mortises (18) which are arranged at intervals, and the center of each mortise (18) and the center of each two adjacent mortises (18) are provided with the bearing platform embedded bars (19).
8. The supporting structure for the synchronous construction of the deep foundation pit under the pedestrian overpass of claim 3, wherein: the side of second foundation ditch fender pile (24) sets up foundation ditch stagnant water stake (11), second foundation ditch fender pile (24) and foundation ditch stagnant water stake (11) avoid cushion cap protection architecture to set up.
9. The supporting structure for the synchronous construction of the deep foundation pit under the pedestrian overpass of claim 3, wherein: the supporting structure comprises a plurality of steel supports (15), the steel supports (15) are arranged at intervals along the depth direction of the deep foundation pit and the length direction of the deep foundation pit, and two ends of each steel support (15) are connected with first foundation pit fender posts (10) or second foundation pit fender posts (24) on two sides of the deep foundation pit through steel purlins (16).
10. The supporting structure for the synchronous construction of the deep foundation pit under the pedestrian overpass of claim 9, wherein: a pair of guide beams (23) are respectively arranged above and below the second foundation pit fender post (24) connected with the steel fender purlin (16), the guide beams (23) are connected with the second foundation pit fender posts (24) in the length direction of the deep foundation pit, the guide beams (23) are symmetrically arranged on two sides of the second foundation pit fender post (24), and the counter-pulling screw rods (21) are arranged on the positions of the second foundation pit fender post (24) in the pair of guide beams (23) in a penetrating mode and are connected through the counter-pulling screw nuts (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121316786.XU CN217105109U (en) | 2021-06-11 | 2021-06-11 | Supporting construction of deep basal pit synchronous construction under people's foot bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121316786.XU CN217105109U (en) | 2021-06-11 | 2021-06-11 | Supporting construction of deep basal pit synchronous construction under people's foot bridge |
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| Publication Number | Publication Date |
|---|---|
| CN217105109U true CN217105109U (en) | 2022-08-02 |
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ID=82577159
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121316786.XU Active CN217105109U (en) | 2021-06-11 | 2021-06-11 | Supporting construction of deep basal pit synchronous construction under people's foot bridge |
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| Country | Link |
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| CN (1) | CN217105109U (en) |
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2021
- 2021-06-11 CN CN202121316786.XU patent/CN217105109U/en active Active
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