CN114108641B - Construction method for common foundation pit of bridge bearing platform and underground structure - Google Patents
Construction method for common foundation pit of bridge bearing platform and underground structure Download PDFInfo
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- CN114108641B CN114108641B CN202111492746.5A CN202111492746A CN114108641B CN 114108641 B CN114108641 B CN 114108641B CN 202111492746 A CN202111492746 A CN 202111492746A CN 114108641 B CN114108641 B CN 114108641B
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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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/12—Back-filling of foundation trenches or ditches
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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Abstract
The invention provides a construction method for a common foundation pit of a bridge bearing platform and an underground structure, relates to the technical field of underground building engineering, and solves the technical problem of long construction period of a construction process of firstly completing the underground structure and then constructing the bridge structure. The construction method comprises the steps of shared foundation pit excavation, foundation structure construction, supporting structure construction and synchronous construction of the structure on the bridge and the underground structure. The foundation pits of the bearing platforms at the two ends of the bridge at the cross section of the bridge and the underground structure are shared with the foundation pit of the underground supporting facility, so that the synchronous construction of the bridge and the underground structure is realized, the construction process is simplified, the construction period is shortened, and the construction cost is saved; compared with the construction process of firstly completing the underground structure and then constructing the bridge structure in the prior art, the construction of the underground structure in the upper bridge structure and the lower bridge space is simultaneously carried out, so that the mutual interference of the bridge construction and the underground structure construction is reduced to the maximum extent, and the engineering quality is improved.
Description
Technical Field
The invention relates to the technical field of underground construction engineering, in particular to a construction method for a foundation pit shared by a bridge bearing platform and an underground structure.
Background
In order to fully utilize underground space, a ramp bridge on a starting layer of a high-speed railway station and a matched underground structure under the bridge are arranged in a vertical crossing manner, the ramp bridge on the starting layer is a passenger vehicle channel, and a pedestrian channel and a bus lane are arranged in the matched underground structure. The cast-in-place concrete structure of the ramp bridge body is cast by erecting a template support system under the bridge, constructing the bearing platforms and the pier columns at two ends of the bridge span of the cross section after the underground structure under the bridge is constructed, backfilled and compacted according to the conventional process arrangement, and then erecting the support system for the cast-in-place beam body construction. The arrangement of the construction process not only results in long construction period, but also disturbs the constructed underground structure by excavating the bearing platform foundation pits at the two ends of the bridge span of the cross section.
Disclosure of Invention
The invention aims to provide a construction method for a common foundation pit of a bridge bearing platform and an underground structure, which at least solves the technical problem that the construction process of firstly completing the underground structure and then constructing the bridge structure in the prior art has long construction period. The technical effects that can be produced by the preferred technical scheme of the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a construction method for a common foundation pit of a bridge bearing platform and an underground structure, which comprises the following steps: the method comprises the steps of common foundation pit excavation, foundation structure construction, supporting structure construction and synchronous construction of an on-bridge structure and an underground structure.
Optionally, the common foundation pit excavation step includes:
and (3) sharing the foundation pit of the underground structure under the cross section bridge with the foundation pits of the bearing platforms at two ends of the bridge, and locally reinforcing the slope surface of the side slope by adopting slope-releasing construction.
Optionally, the foundation structure constructing step includes:
and (5) constructing the strip concrete foundation of the pile foundation, the bearing platform and the temporary steel pipe column below the bearing platform.
Optionally, before construction, the stratum below the strip-shaped concrete foundation is reinforced.
Optionally, the support structure constructing step includes:
s1, hoisting a temporary steel pipe column and constructing a bridge pier column;
s2, mounting an I-shaped steel distribution beam at the top end of the temporary steel pipe column;
s3, installing the Bailey beam;
and S4, erecting a full-hall support.
Optionally, a "Z" -shaped transverse connection assembly is arranged between adjacent temporary steel pipe columns.
Optionally, in the step S2, the i-shaped steel distribution beams are horizontally installed, and the heights of the rows are uniform.
Optionally, step S3 includes:
s31, assembling and connecting the Bailey beams on the ground in groups;
s32, marking the position of the Bailey beam at intervals on the transverse bridge direction I-shaped steel;
s33, hoisting the connected Bailey beams in place according to the sequence of the middle part and the two sides.
Optionally, two lifting points are arranged when the single group of bailey beams are lifted, and the lifting points are distributed equidistantly.
Optionally, the full hall support comprises an adjustable base, a vertical rod, a cross rod, an oblique rod and an adjustable bracket; and the connecting nodes of the full-hall bracket are locked and fixed through a disc-shaped buckle disc and a caliper type wedge buckle.
According to the construction method for the foundation pit shared by the bridge bearing platform and the underground structure, the foundation pits of the bearing platforms at two ends of the bridge at the cross section of the bridge and the underground structure are shared with the foundation pit of the underground supporting facility, so that the synchronous construction of the bridge and the underground structure is realized, the construction process is simplified, the construction period is shortened, and the construction cost is saved; compared with the construction process of firstly completing the underground structure and then constructing the bridge structure in the prior art, the construction of the underground structure in the upper bridge structure and the lower bridge space is simultaneously carried out, so that the mutual interference of the bridge construction and the underground structure construction is reduced to the maximum extent, and the engineering quality is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, 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 the drawings without creative efforts.
FIG. 1 is a schematic longitudinal cross-sectional structural view of a cross section of a bridge and an underground structure constructed by using a bridge bearing platform and an underground structure to share a foundation pit according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the infrastructure provided by an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the temporary steel pipe column after hoisting and bridge pier column construction;
FIG. 4 is a structural schematic diagram of an installed I-shaped steel distribution beam at the top end of the temporary steel pipe column;
FIG. 5 is a schematic view of a connection structure of a temporary steel pipe column, a bar-shaped concrete foundation and an I-shaped steel distribution beam;
FIG. 6 is a schematic structural view of the installed Bailey beam;
fig. 7 is a schematic structural view after the full framing is completed.
Fig. 8 is a structural schematic diagram of a cross section of a steel pipe column and beret beam combined support structure according to an embodiment of the present invention.
In the figure 1, a strip-shaped concrete foundation; 2. steel pipe columns; 3. a distribution beam; 4. a Bailey beam; 5. a full support; 6. a transverse connection assembly; 7. a flange plate; 8. pile foundations; 9. a bearing platform; 10. pier studs; 11. a beam body.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a construction method for sharing a foundation pit by a bridge bearing platform and an underground structure.
The invention provides a construction method for a foundation pit shared by a bridge bearing platform and an underground structure, which comprises the following steps: the method comprises the steps of common foundation pit excavation, foundation structure construction, supporting structure construction and synchronous construction of the structure on the bridge and the underground structure. The structure of the cross section of the bridge and the underground structure adopting the construction method is shown in figures 1 and 8.
The bridge and the underground structure are in a cross section, and the bearing platforms 9 at the two ends of the bridge share the foundation pit of the underground structure, so that the synchronous construction of the bridge and the underground structure is realized, the construction process is simplified, the construction period is shortened, and the construction cost is saved; the construction of the upper structure of the bridge and the underground structure in the space under the bridge is carried out simultaneously, so that the mutual interference of the bridge construction and the underground structure construction is reduced to the maximum extent, and the engineering quality is improved.
Specifically, the construction method includes the following steps (the construction process after disassembly is shown in fig. 2-4, 6 and 7):
(1) Excavating a foundation pit shared by an underground structure and a bridge bearing platform 9, and constructing a strip-shaped concrete foundation 1 of the bearing platform 9 and the temporary steel pipe column 2;
1) And combining and sharing the underground structure foundation pit under the bridge of the cross section and the bearing platform 9 foundation pits at two ends of the bridge span, and locally reinforcing the slope surface of the side slope by adopting slope releasing construction.
2) After the excavation of the common foundation pit is finished, the bar-shaped concrete foundations 1 of the pile foundation 8, the bearing platform 9 and the temporary steel pipe column 2 under the bridge bearing platform 9 are constructed, and before construction, the stratum below the bar-shaped concrete foundations 1 is reinforced so as to meet the requirement of the bearing capacity of the foundation. See fig. 2.
(2) Temporary steel pipe column 2 hoisting and bridge pier column 10 construction
The temporary steel pipe column 2 is made of steel pipes with the diameter of 800mm and the wall thickness of 16mm, each pipe is 10-11m long, a bottom flange 7 is welded at the lower part, and a top flange 7 is welded at the upper part. The spacing between the steel pipe columns 2 is 2.5-4m. And anchor bolts are reserved between the bottom flange 7 and the strip-shaped concrete foundation 1. And 20a channel steel is welded for connecting each row of steel columns and used as a connecting system, and the Z-shaped transverse connecting assembly 6 ensures the overall stability of the steel pipe column 2 system, and is shown in figure 3.
(3) Installation of I-steel distribution beam at top end of temporary steel pipe column 2
The I-steel distribution beam 3 can reasonably distribute the load on the bridge to the temporary steel pipe column 2. The I-shaped steel distribution beam 3 is welded and fixed with the top end of the steel pipe column 2. The I-steel installation process should guarantee the level, and each row of height should be unified, guarantees that bailey roof beam 4 and its contact each point are unsettled, and the atress is even. See fig. 4 and 5.
(4) Single-layer Bailey beam 4 installation
The Bailey beams 4 are assembled on the ground and connected in groups. And marking the position of the Bailey beam 4 by using red paint at certain intervals on the transverse bridge direction I-shaped steel. And hoisting the connected Bailey beam 4 in place by using a truck crane according to the sequence of the middle part and the two sides.
When the single group of Bailey beams 4 are hoisted, two hoisting points are required to be arranged and distributed at equal intervals, and the balance of the Bailey beams 4 in the hoisting process is kept so as to avoid the generation of torsional stress in the hoisting process. And laying 14# I-steel after the Bailey beam 4 is completely erected. The Bailey beams 4 need to be fixedly connected with the full frames on the two sides and the upper part by steel pipes, so that the shaking of the Bailey beams 4 is reduced. See fig. 6.
(5) The full framing 5 is set up and poured to form a beam body 11
The bridge cast-in-place box girder is built by adopting a full phi 60 series socket plate buckle support. The full support 5 consists of an adjustable base, an upright rod, a cross rod, an inclined rod and an adjustable bracket, and has good stability, light weight and high strength. The bearing capacity of the frame body is high. The connection form of the frame body adopts a disc-shaped buckle disc and a caliper type wedge buckle for locking and fixing. The installation speed is fast, and the precision is high. See fig. 7.
The specification of the bracket material is as follows: the bracket adopts a coil buckle type steel pipe frame, and the vertical rod adopts five specifications of 0.5m, 1.0m, 1.5m, 2.0m and 2.5 m. The horizontal rod adopts three specifications of 0.6m, 0.9m and 1.5m, and the top and bottom supports adopt adjustable support supports.
After the bridge full-hall support 5 is erected, the construction of the underground structures in the upper bridge structure and the lower bridge foundation pit can be simultaneously carried out, so that the mutual interference of the bridge construction and the underground structure construction is reduced to the maximum extent, and the method is shown in figure 1.
The foundation pits of the bearing platforms 9 at the two ends of the bridge at the cross section of the bridge and the underground structure are shared with the foundation pit of the underground supporting facility, so that the synchronous construction of the bridge and the underground supporting facility is facilitated, the construction process is simplified, and the construction cost is saved.
And the mode that the steel pipe column 2 and the Bailey beam 4 are combined for supporting can ensure that the structure pouring in the foundation pit under the bridge and the pouring of the bridge beam body 11 are carried out synchronously, so that the construction period is saved.
In the description of the invention, it is to be noted that "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A construction method for a bridge bearing platform and an underground structure to share a foundation pit is characterized by comprising the following steps: common foundation pit excavation, foundation structure construction, supporting structure construction and synchronous construction of an on-bridge structure and an underground structure; wherein:
the common foundation pit excavation step comprises the following steps:
the underground structure foundation pit under the cross section bridge and the bearing platform foundation pits at two ends of the bridge are excavated and shared, slope placing construction is adopted, and local reinforcement treatment is carried out on the slope surface of the side slope;
the foundation structure construction step comprises: constructing strip-shaped concrete foundations of the pile foundation, the bearing platform and the temporary steel pipe column below the bearing platform;
the support structure construction step comprises:
s1, hoisting a temporary steel pipe column and constructing a bridge pier column;
s2, mounting an I-shaped steel distribution beam at the top end of the temporary steel pipe column;
s3, installing the Bailey beam;
and S4, erecting a full-hall support.
2. The construction method of the foundation pit shared by the bridge bearing platform and the underground structure according to claim 1, wherein the stratum below the strip-shaped concrete foundation is reinforced before construction.
3. The construction method of the foundation pit shared by the bridge bearing platform and the underground structure according to claim 1, wherein a Z-shaped transverse connecting assembly is arranged between adjacent temporary steel pipe columns.
4. The construction method of the foundation pit shared by the bridge bearing platform and the underground structure according to claim 1, wherein the I-shaped steel distribution beams in the step S2 are horizontally arranged, and the heights of all the rows are uniform.
5. The construction method of the foundation pit shared by the bridge bearing platform and the underground structure according to claim 1, wherein the step S3 comprises:
s31, assembling and connecting the Bailey beams on the ground in groups;
s32, marking the position of the Bailey beam at intervals on the transverse bridge direction I-shaped steel;
s33, hoisting the connected Bailey beams in place according to the sequence of the middle part and the two sides.
6. The construction method of the foundation pit shared by the bridge bearing platform and the underground structure according to claim 5, wherein two lifting points are arranged when the single group of Bailey beams are lifted, and the lifting points are distributed at equal intervals.
7. The method of claim 1, wherein the full-scale support comprises an adjustable base, vertical rods, cross rods, diagonal rods, and adjustable brackets; and the connecting nodes of the full-space support are locked and fixed through a disc-shaped buckle disc and a caliper type wedge buckle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111492746.5A CN114108641B (en) | 2021-12-08 | 2021-12-08 | Construction method for common foundation pit of bridge bearing platform and underground structure |
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| CN202111492746.5A CN114108641B (en) | 2021-12-08 | 2021-12-08 | Construction method for common foundation pit of bridge bearing platform and underground structure |
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| CN114108641B true CN114108641B (en) | 2023-04-18 |
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| JP2001040669A (en) * | 1999-07-28 | 2001-02-13 | Emi Majima | Slope longitudinal-lateral shifter |
| CN101280549B (en) * | 2008-05-28 | 2010-11-10 | 中铁十二局集团第七工程有限公司 | Construction method of mobile type bracket subsection cast-in-situ continuous beam |
| CN207714143U (en) * | 2017-03-17 | 2018-08-10 | 中铁二十四局集团安徽工程有限公司 | A kind of cast-in-place and traversing supporting structure in place of concrete box girder high-altitude dislocation |
| CN111691454A (en) * | 2020-05-19 | 2020-09-22 | 广州地铁设计研究院股份有限公司 | Subway station and bridge co-construction structure and construction method |
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