CN111236040A - D-shaped temporary beam erecting method for underneath passing through railway frame bridge type tunnel - Google Patents

D-shaped temporary beam erecting method for underneath passing through railway frame bridge type tunnel Download PDF

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Publication number
CN111236040A
CN111236040A CN202010021046.7A CN202010021046A CN111236040A CN 111236040 A CN111236040 A CN 111236040A CN 202010021046 A CN202010021046 A CN 202010021046A CN 111236040 A CN111236040 A CN 111236040A
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CN
China
Prior art keywords
piles
temporary
erecting
bored pile
constructing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010021046.7A
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Chinese (zh)
Inventor
陈洪春
徐建华
罗星文
许志艳
刘发明
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China Railway Eryuan Engineering Group Co Ltd CREEC
Original Assignee
China Railway Eryuan Engineering Group Co Ltd CREEC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Railway Eryuan Engineering Group Co Ltd CREEC filed Critical China Railway Eryuan Engineering Group Co Ltd CREEC
Priority to CN202010021046.7A priority Critical patent/CN111236040A/en
Publication of CN111236040A publication Critical patent/CN111236040A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D18/00Bridges specially adapted for particular applications or functions not provided for elsewhere, e.g. aqueducts, bridges for supporting pipe-lines
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same

Abstract

The invention discloses a method for erecting a D-shaped temporary beam for a bridge tunnel of a downward-passing railway frame, which comprises the following steps: constructing an open cut foundation on the existing railway roadbed by using the skylight time; erecting a temporary girder on the open cut foundation to reinforce the line; excavating hole digging piles on the reinforced roadbed, excavating the hole digging piles to 15m below the road shoulder, and pouring the hole digging piles; after the bored piles reach the designed strength, constructing transverse supports between two rows of bored piles, excavating soil layers between the two rows of bored piles in a layered mode to form a bored pile construction foundation pit, and constructing the transverse supports at the bottom of the bored pile construction foundation pit; constructing a bored pile by using the bored pile construction foundation pit as a construction platform, backfilling the bored pile construction foundation pit after the bored pile construction is finished, and removing the temporary beam; taking the drilled piles as D-shaped temporary beam supporting piles, erecting the D-shaped temporary beams, and constructing transverse supports among the drilled piles; digging a frame foundation pit under the D-shaped temporary beam, and constructing a frame bridge type tunnel; and backfilling the foundation pit of the frame, removing the D-shaped temporary beam and recovering the line.

Description

D-shaped temporary beam erecting method for underneath passing through railway frame bridge type tunnel
Technical Field
The invention relates to the technical field of road and bridge engineering, in particular to a method for erecting a D-shaped temporary beam of a bridge tunnel passing through a railway frame.
Background
At present, the construction of underground tunnels passing through a large railway yard generally adopts D-shaped temporary bridge hollow existing railway construction, excavating bored piles are arranged on a roadbed after reinforcement to serve as D-shaped temporary bridge support piers for constructing the lower frames of the existing railway, and the construction method can meet the construction requirements of most frame type tunnels passing through the existing railway.
However, in areas with poor geology (without bedrock) and high ground water level, such as lake sedimentary areas, coastal areas and the like, although the excavation piles reach the ultimate excavation depth (up to 15 meters), the ultimate excavation depth of the excavation piles cannot be used as the areas of the D-shaped temporary beam support piles, and the requirements of the D-shaped temporary beam support piles cannot be met, so that the method cannot be used for constructing the underpass frame bridge tunnel in the areas.
Disclosure of Invention
The invention aims to: aiming at the problem that the deep limit excavation of an excavation pile can not meet the requirement of a D-shaped temporary beam supporting pile under the condition of special geology in the prior art, a method for erecting a D-shaped temporary beam of a bridge type tunnel of a downward-passing railway frame is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a D-shaped temporary beam erecting method for a bridge tunnel of an underpass railway frame comprises the following steps:
the method comprises the following steps: constructing an open cut foundation on the existing railway roadbed by using the skylight time as a fulcrum of a temporary beam;
step two: erecting a temporary girder on the open cut foundation to reinforce the line by using the skylight time;
step three: excavating hole digging piles on the reinforced roadbed, wherein the hole digging piles are excavated to be 10-15 m below the road shoulder, and pouring the hole digging piles;
step four: after the hole digging piles reach the designed strength, constructing transverse supports between two rows of hole digging piles, excavating soil layers between two rows of hole digging piles in a layered mode, taking the soil to a depth of 3-12 m below a road shoulder to form a bored pile construction foundation pit, and constructing the transverse supports at the bottom of the bored pile construction foundation pit;
step five: constructing a bored pile by using the bored pile construction foundation pit as a construction platform, backfilling the bored pile construction foundation pit after the bored pile construction is finished, and removing the temporary girder;
step six: taking the drilled piles as D-shaped temporary beam supporting piles, erecting D-shaped temporary beams and constructing transverse supports among the drilled piles;
step seven: digging a frame foundation pit under the D-shaped temporary beam, and constructing a frame bridge type tunnel;
step eight: and backfilling the frame foundation pit, removing the D-shaped temporary beam and recovering the line.
The construction method comprises the steps of firstly constructing the hole digging piles, constructing the drilling pile construction foundation pits among the hole digging piles, and constructing the drilling piles by using the drilling pile construction foundation pits as a construction platform, so that the defect of ultimate digging depth (15m) of the hole digging piles can be overcome, and the D-shaped temporary beam support piles can be constructed to be below 15m below the road shoulder through the drilling piles under the condition that the requirement of the D-shaped temporary beam support piles cannot be met at the ultimate digging depth of the hole digging piles, so that the existing railway line can be penetrated under a frame bridge type tunnel in the regions with poor geology (without bedrock) and high underground water level.
As a preferable aspect of the present invention, in the first step, the open cut foundation is a strip foundation.
In a preferred embodiment of the present invention, in the second step, the temporary girder is a D-shaped girder or a rail beam.
As a preferable scheme of the invention, in the fourth step, when the soil layer between two rows of the hole digging piles is excavated in layers, the excavation depth of each layer is less than or equal to 3m, and the hole digging piles are supported after each layer of excavation is finished, so that the stability of the hole digging piles is ensured.
As a preferred scheme of the invention, in the fourth step, after each layer of excavation is finished, a temporary steel pipe is adopted for supporting.
As a preferable scheme of the present invention, in the fourth step and the sixth step, the transverse supports are reinforced concrete supports, and in the fourth step, a reinforced concrete crown beam is provided at the top of the bored pile.
In a preferable embodiment of the present invention, in the fourth step, the soil sampling depth is 6m to 10m below the shoulder.
As a preferred scheme of the present invention, in the fifth step, the bored pile construction foundation pit is used as a platform for placing bored pile construction equipment.
And as a preferred scheme of the invention, in the fifth step, the bored pile is backfilled with concrete to construct the foundation pit.
In a preferred embodiment of the present invention, in the sixth step, a reinforced concrete cap is disposed on the top of the bored pile.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the construction method comprises the steps of firstly constructing the hole digging piles, constructing the drilling pile construction foundation pits among the hole digging piles, and constructing the drilling piles by using the drilling pile construction foundation pits as a construction platform, so that the defect of ultimate digging depth (15m) of the hole digging piles can be overcome, and the D-shaped temporary beam support piles can be constructed to be below 15m below the road shoulder through the drilling piles under the condition that the requirement of the D-shaped temporary beam support piles cannot be met at the ultimate digging depth of the hole digging piles, so that the existing railway line can be penetrated under a frame bridge type tunnel in the regions with poor geology (without bedrock) and high underground water level.
Drawings
FIG. 1 is a schematic structural diagram of step one according to the present invention.
FIG. 2 is a schematic structural diagram of step two of the present invention.
Fig. 3 is a schematic structural diagram of step three according to the present invention.
Fig. 4 is a schematic structural diagram of step four according to the present invention.
Fig. 5 is a schematic structural diagram of step five according to the present invention.
Fig. 6 is a schematic structural diagram of step six according to the present invention.
Fig. 7 is a schematic structural diagram of step seven in the present invention.
Icon: 1-rail surface, 2-open cut foundation, 3-temporary beam, 4-excavated pile, 5-slag retaining wall, 6-transverse support, 7-crown beam, 8-drilled pile construction foundation pit, 9-drilled pile, 10-bearing platform, 11-D type temporary beam and 12-frame bridge type tunnel.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A D-shaped temporary beam erecting method for a bridge tunnel of an underpass railway frame comprises the following steps:
the method comprises the following steps: as shown in fig. 1, an open cut foundation 2 is constructed on an existing railway roadbed (below a rail surface 1) by using skylight time as a fulcrum of a temporary beam 3, wherein the open cut foundation 2 is a strip foundation;
step two: as shown in fig. 2, a temporary girder 3 is erected on the open cut foundation 2 by using the skylight time to reinforce the line, wherein the temporary girder 3 is a D-shaped girder or a rail beam;
step three: as shown in fig. 3, excavating hole-digging piles 4 on the reinforced roadbed, excavating the hole-digging piles 4 to 10-15 m below the road shoulder, pouring the hole-digging piles 4, and arranging slag blocking walls 5 at the end parts of the hole-digging piles 4:
step four: as shown in fig. 4, after the bored piles 4 reach the designed strength, constructing a reinforced concrete transverse support 6 between two rows of the bored piles 4, arranging a reinforced concrete crown beam 7 at the top of each bored pile 4, excavating soil layers between two rows of the bored piles 4 in layers, wherein the depth of each layer of excavation is less than or equal to 3m, supporting each layer of excavation by adopting a temporary steel pipe after the excavation is finished, taking the soil depth to be 7m below a road shoulder, sealing the bottom by adopting concrete to form a bored pile construction foundation pit 8, and constructing the reinforced concrete transverse support 6 at the bottom of the bored pile construction foundation pit 8;
step five: as shown in fig. 5, the bored pile construction foundation pit 8 is used as a construction platform, a bored pile construction tool is placed on the bored pile construction foundation pit 8 to construct a bored pile 9, the bored pile construction foundation pit 8 is backfilled with concrete after the construction of the bored pile 9 is completed, and the temporary girder 3 is removed;
step six: as shown in fig. 6, a reinforced concrete bearing platform 10 is arranged on the top of the bored piles 9, the bored piles 9 are used as supporting piles of D-shaped temporary beams 11, the D-shaped temporary beams 11 are erected, and reinforced concrete transverse supports 6 between the bored piles 9 are constructed, wherein the transverse supports comprise steel supports, steel diagonal braces and reinforced concrete wales;
step seven: as shown in fig. 7, a frame foundation pit is excavated under the D-shaped temporary beam 11, and a frame bridge tunnel 12 is constructed;
step eight: and backfilling the frame foundation pit, removing the D-shaped temporary beam 11 and recovering the line.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A D-shaped temporary beam erecting method for a bridge tunnel of an underpass railway frame is characterized by comprising the following steps:
the method comprises the following steps: constructing an open cut foundation on the existing railway roadbed by using the skylight time as a fulcrum of a temporary beam;
step two: erecting a temporary girder on the open cut foundation to reinforce the line by using the skylight time;
step three: excavating hole digging piles on the reinforced roadbed, wherein the hole digging piles are excavated to be 10-15 m below the road shoulder, and pouring the hole digging piles;
step four: after the hole digging piles reach the designed strength, constructing transverse supports between two rows of hole digging piles, excavating soil layers between two rows of hole digging piles in a layered mode, taking the soil to a depth of 3-12 m below a road shoulder to form a bored pile construction foundation pit, and constructing the transverse supports at the bottom of the bored pile construction foundation pit;
step five: constructing a bored pile by using the bored pile construction foundation pit as a construction platform, backfilling the bored pile construction foundation pit after the bored pile construction is finished, and removing the temporary girder;
step six: taking the drilled piles as D-shaped temporary beam supporting piles, erecting D-shaped temporary beams and constructing transverse supports among the drilled piles;
step seven: digging a frame foundation pit under the D-shaped temporary beam, and constructing a frame bridge type tunnel;
step eight: and backfilling the frame foundation pit, removing the D-shaped temporary beam and recovering the line.
2. The method for D-shaped bridge erection of an underpass railway frame bridge tunnel as claimed in claim 1, wherein in said first step, said open cut foundation is a strip foundation.
3. The method for D-shaped temporary beam erection of an underpass railway frame bridge tunnel as claimed in claim 1, wherein in said second step, said temporary beam is a D-shaped temporary beam or a rail beam.
4. The method for erecting the bridge of the underneath passing railway frame bridge tunnel according to claim 1, wherein in the fourth step, when the soil layer between two rows of the excavated piles is excavated in layers, the depth of each layer of the excavated soil layer is less than or equal to 3m, and each layer of the excavated soil layer is supported after being excavated.
5. The method for erecting the bridge of the underneath passing railway frame bridge tunnel according to claim 4, wherein in the fourth step, each layer of excavation is completed and then supported by temporary steel pipes.
6. The method for erecting the bridge of the underneath passing railway frame bridge tunnel of claim 1, wherein in the fourth step and the sixth step, the transverse supports are reinforced concrete supports, and in the fourth step, reinforced concrete crown beams are arranged on the tops of the bored piles.
7. The method for erecting the bridge of the underneath passing railway frame bridge tunnel of claim 1, wherein in the fourth step, the soil taking depth is 6m to 10m below the road shoulder.
8. The method for erecting the D-shaped temporary beam for the underpass railway frame bridge tunnel according to any one of claims 1 to 7, wherein in the fifth step, the bored pile construction foundation pit is used as a platform for placing bored pile construction equipment.
9. The method for erecting the D-shaped temporary beam for the underpass railway frame bridge tunnel according to any one of claims 1 to 7, wherein in the fifth step, the bored pile is backfilled with concrete to construct the foundation pit.
10. The method for erecting the bridge of the D-shaped temporary girder for the underpass railway frame bridge tunnel as claimed in any one of claims 1 to 7, wherein in the sixth step, a reinforced concrete bearing platform is arranged at the top of the bored pile.
CN202010021046.7A 2020-01-08 2020-01-08 D-shaped temporary beam erecting method for underneath passing through railway frame bridge type tunnel Pending CN111236040A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112709147A (en) * 2020-12-28 2021-04-27 中铁第四勘察设计院集团有限公司 Line overhead method suitable for high underground water level
CN112727495A (en) * 2021-01-29 2021-04-30 中铁二院工程集团有限责任公司 Bracing structure for controlling deformation of bottom of tunnel
CN113235639A (en) * 2021-03-29 2021-08-10 中铁武汉勘察设计院有限公司 Existing line lower row pile enclosure structure and construction method thereof
CN113718784A (en) * 2021-09-29 2021-11-30 西安建筑科技大学 High-water-level loess stratum multi-track railway composite overhead system and construction method thereof

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CN107620261A (en) * 2017-09-14 2018-01-23 中国铁路设计集团有限公司 Based on the horizontal existing railway track reinforcement means for holding formula just beam
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112709147A (en) * 2020-12-28 2021-04-27 中铁第四勘察设计院集团有限公司 Line overhead method suitable for high underground water level
CN112727495A (en) * 2021-01-29 2021-04-30 中铁二院工程集团有限责任公司 Bracing structure for controlling deformation of bottom of tunnel
CN113235639A (en) * 2021-03-29 2021-08-10 中铁武汉勘察设计院有限公司 Existing line lower row pile enclosure structure and construction method thereof
CN113718784A (en) * 2021-09-29 2021-11-30 西安建筑科技大学 High-water-level loess stratum multi-track railway composite overhead system and construction method thereof

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