CN203174453U - Light-mass embankment structure for managing bump at bridge head - Google Patents

Light-mass embankment structure for managing bump at bridge head Download PDF

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Publication number
CN203174453U
CN203174453U CN2013201271181U CN201320127118U CN203174453U CN 203174453 U CN203174453 U CN 203174453U CN 2013201271181 U CN2013201271181 U CN 2013201271181U CN 201320127118 U CN201320127118 U CN 201320127118U CN 203174453 U CN203174453 U CN 203174453U
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China
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bridge
roadbed
head
foundation
light
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CN2013201271181U
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Chinese (zh)
Inventor
俞帆
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浙江省交通规划设计研究院
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Publication of CN203174453U publication Critical patent/CN203174453U/en

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Abstract

The utility model discloses a light-mass embankment structure for managing bump at a bridge head. The light-mass embankment structure comprises a soft soil foundation, wherein a gravel base layer is paved on the soft soil foundation; a road bed is arranged on the gravel base layer; a pavement structural layer is paved on the foundation; one side, which is adjacent to a bridge abutment, of the foundation is dug and unloaded to form a backfill region; a bridge head approach slap is arranged on the foundation and is positioned above the backfill region; and one end of the bridge head approach slap is erected on a bridge abutment bracket. The embankment structure provided by the utility model can control the after-settlement mount of the soft soil foundation at the bridge head, improve the stability of the embankment, reduce the lateral pressure on the bride abutment, relieve the sudden change of rigidity and flexibility of a material of a combined part between the bridge abutment and the foundation, realize settlement steady transition and avoid a phenomenon of secondary bump and is an effective technical scheme for managing the bump at the bridge head.

Description

A kind of for the light road bank structure of administering bumping at bridge-head

Technical field

The utility model belongs to technical field of civil engineering, is specifically related to a kind of for the light road bank structure of administering bumping at bridge-head.

Background technology

High-grade highway (comprising speedway) after operation is open to traffic soon, problem of ubiquity: sedimentation fracture in various degree appears in the road surface at the back filling behind abutment place, make vehicle by the time produce to jump and impact, thereby bridges and culverts and road surface are caused additional impact load, make driver and passenger feel the discomfort of jolting, even causing vehicle deceleration, serious caused traffic accident influences traffic safety; For freeway bridge parting base on soft foundation, need keep in repair every 3-5 especially, often cause the operation costs costliness.Therefore, problem of bumping at bridge-head is the technical barrier that presses for solution.

Bumping at bridge-head on the soft foundation is the technical problem of a more complicated, usually be subjected to the influence of many uncertain factors, as construction quality, design parameters, settlement calculation method, unreasonable design, construction and management of the effect of weak soil thickness and character thereof, treatment of soft foundation, roadbed filling height, platform back of the body filler etc.Usually the main cause that bumping at bridge-head produces can be summarised as the following aspects:

(1) the bad sedimentation that causes of ground soil property; Bridges and culverts is usually located at the place, gully, and groundwater table is higher, in southern area weak soil is arranged more, this type of native natural moisture content is greater than liquid limit, and natural void ratio is big, often contains organic matter, the compressibilty height, shear strength is low, in case be disturbed, natural structure easily is damaged, and intensity just significantly reduces, and end of the bridge roadbed filling height is bigger, the generation base stress is relatively large, under the vehicular load effect, the easier subsidence of foundations that causes, and stable the lasting of distortion often lasts for several years and even many decades.When filling roadbed on soft foundation, can make weak soil produce immediate settlement, primary consolidation sedimentation and secondary consolidation settlement.

(2) compression of platform back of the body filler causes the sedimentation of roadbed; Work plane is little because the platform back of the body bankets when road roller rolls, particularly general road roller can't operation around the embed-type pillar abutment platform cap, this just causes the fill compaction degree on bridge approach and awl slope not reach standard, under the effect repeatedly of wheel load, roadbed filling is compressed gradually, produces the compression sedimentation in the back a period of time that is open to traffic.

(3) depression that causes of hard and soft sudden change; Bridge normally is supported on the rigid structures on the rock stratum, has bigger integral rigidity, and the relative flexible body that belongs to of road that links to each other with it has the big characteristic of the little flexibility of rigidity, belongs to elasticoplastic body.Obviously, the existence of this rigidity difference must cause elasticity and the plastic strain difference that generation is bigger between road and the abutment, has increased the weight of the vibrating effect of bumping at bridge-head.

Wherein the sedimentation that causes of soft foundation is the most important reason of bumping at bridge-head, handles that soft foundation is the important measures of control bumping at bridge-head behind the platform well.Special in the end of the bridge roadbed that is built on the deep soft soil foundation, this problem is especially outstanding, mainly contains in order to address this problem traditional method for designing: consolidation+surcharge preloading method and pile formula reinforcement embankment method.Consolidation+surcharge preloading method disposal cost is low, the processing degree of depth is big, so be extensive use, finds that from nearly more than ten years speedway operation process the end of the bridge roadbed ubiquity settlement amount after construction after this method is handled is big, the phenomenon that bumping at bridge-head is serious; Pile formula reinforcement embankment method (generally adopting pile for prestressed pipe) disposal cost height, generally only be applicable to the end of the bridge roadbed, obviously reduce the settlement after construction of end of the bridge roadbed, improved the bumping at bridge-head phenomenon, but between end of the bridge highway section and general highway section, " secondary jumping car " phenomenon occurred.

Publication number is that the Chinese patent of CN102286907A has proposed a kind of method that stirs wall processing bumping at bridge-head based on gate-type cement, this method adopts cement to stir wall prolongation pore water dissipation path, slow down ground consolidation speed, suppress the sedimentation development, reaching settlement after construction at service lifetime inner control end of the bridge roadbed in 10cm, extenuating the bumping at bridge-head phenomenon, but this method only is applicable to low embankment, the situation of end of the bridge subgrade stability can not fundamentally solve problem of bumping at bridge-head.

Summary of the invention

At the above-mentioned technological deficiency of existing in prior technology, it is a kind of for the light road bank structure of administering bumping at bridge-head that the utility model provides, and can effectively punish the problem of bumping at bridge-head.

A kind of for the light road bank structure of administering bumping at bridge-head, comprise soft foundation; Be equipped with the gravel bed course on the described soft foundation; Described gravel bed course is provided with roadbed, is equipped with road surface structare layer on the described roadbed; The side that described roadbed and abutment are adjacent forms a back filled region by the excavation unloading; Described roadbed is provided with transition slab at bridge head, and described transition slab at bridge head is positioned at the top, back filled region, and transition slab at bridge head one end is erected on the abutment bracket.

Preferably, described roadbed is divided into three sections successively: general highway section, transition zone and end of the bridge section; General highway section does not have the back filled region, and transition zone and end of the bridge section all have the back filled region; The bottom surface of end of the bridge section back filled region is horizontal plane, and the bottom surface of transition zone back filled region is the inclined-plane; It is in order to make the sedimentation smooth transition, to avoid occurring " secondary jumping car " phenomenon that transition zone is set.

Preferably, be inserted with band drain or sand wick in the described soft foundation, it plugs the degree of depth and is limited for punching the weak soil layer; Can make soft foundation discharge fixing, improve the intensity of foundation soil body, accelerate the primary consolidation sedimentation.

Preferably, described back filled region adopts light material to fill; Can make foundation soil normal consolidation state be converted into the overconsolidation state, to reach the purpose that reduces and control the settlement amount after construction of soft foundation.

Described light material can adopt block foam, flyash or cast-in-place foamed concrete etc.

Preferably, described transition slab at bridge head adopts the armored concrete slab of non-equal thickness; To alleviate the rigidity sudden change of abutment and roadbed, it is poor to regulate abutment and roadbed settlement after construction, is beneficial to the road structure transition.

Preferably, the length of described armored concrete slab is 8m.

The depth capacity of described back filled region is L/3~L/2, and L is roadbed thickness, specifically should recently determine according to the overconsolidation of design.

Embankment structure of the present utility model can be controlled the settlement amount after construction of end of the bridge soft foundation, improves the stability of embankment; Minimizing is to the lateral pressure of abutment; Alleviated the hard and soft sudden change of abutment and roadbed joint portion material; Having realized the sedimentation smooth transition, eliminated " secondary jumping car " phenomenon, is a kind of punishment bumping at bridge-head otherwise effective technique scheme.

Description of drawings

Fig. 1 is structural representation of the present utility model.

Fig. 2 is that Fig. 1 is along the schematic cross-section of AA ' direction.

The specific embodiment

In order more specifically to describe the utility model, below in conjunction with the drawings and the specific embodiments the technical solution of the utility model is elaborated.

As depicted in figs. 1 and 2, a kind of for the light road bank structure of administering bumping at bridge-head, comprise soft foundation 1; Be inserted with band drain 7 in the soft foundation 1, band drain 7 quadrate array arrangements, the spacing of adjacent drainage channel plate 7 is 1~2m, plugs the degree of depth and is limited for punching the weak soil layer.

Be equipped with gravel bed course 2 on the soft foundation 1; Gravel bed course 2 is provided with roadbed 3, and roadbed 3 adopts native stone mixed fillers, and roadbed 3 and abutment 6 adjacent sides form a back filled region by the excavation unloading; The back filled region adopts light material (as block foam, flyash or cast-in-place foamed concrete etc.) to fill, and can make foundation soil normal consolidation state be converted into the overconsolidation state, with the purpose of the settlement amount after construction that reaches remarkable minimizing and control soft foundation;

Roadbed 3 is divided into three sections successively: general highway section, transition zone and end of the bridge section; General highway section does not have the back filled region, and transition zone and end of the bridge section all have the back filled region; The bottom surface of end of the bridge section back filled region is horizontal plane, and the bottom surface of transition zone back filled region is the inclined-plane; It is in order to make the sedimentation smooth transition, to avoid occurring " secondary jumping car " phenomenon that transition zone is set;

Roadbed 3 is provided with transition slab at bridge head 5 and is equipped with road surface structare layer 4, and transition slab at bridge head 5 is positioned at the top, back filled region, and the one end is erected on the bracket of abutment 6; Transition slab at bridge head 5 adopts the armored concrete slab of non-equal thickness, is conducive to the road structure transition.

The concrete construction sequence of present embodiment is as follows:

(1) adopts consolidation that soft foundation 1 is carried out ground and handle, in soft foundation 1, set plastic draining board 7 drainings, and spread gravel bed course 2; This method cost is low, applied widely, and easy construction is economical and practical;

(2) filling roadbed 3 pairs of soft foundations 1 carry out piling prepressing; Roadbed 3 adopts native stone mixed fillers commonly used, and the precompressed phase should be determined by design according to ground soil thickness and characteristic thereof and ground processing parameter;

(3) after the precompressed roadbed 3 is unloaded the backfill light material; The unit weight of unloading thickness and light material should recently be determined according to the overconsolidation of design, light material should satisfy as the required intensity of roadbed filling, distortion and life requirement, can adopt materials such as block foam, flyash, cast-in-place foamed concrete; If adopt cast-in-place foamed concrete, also need maintenance after reach design strength, the road surface of constructing again;

(4) at roadbed 3 transition slab at bridge head 5 is set, can alleviates the hard and soft sudden change of abutment 6 and roadbed 3 joint portion materials, transition slab at bridge head 5 adopts non-equal thickness armored concrete slab, and employing is obliquely installed (gradient is 2%~3%);

(5) between end of the bridge section and general highway section transition zone being set, is in order to make the sedimentation smooth transition, to avoid occurring " secondary jumping car " phenomenon; The length of transition zone should be poor according to the settlement after construction in end of the bridge section and general highway section, is 0.3~0.5% to design according to the sedimentation longitudinal gradient; And the ground in end of the bridge section, transition zone, general highway section all adopts same method for processing foundation.

Claims (6)

1. a light road bank structure that is used for administering bumping at bridge-head comprises soft foundation; Be equipped with the gravel bed course on the described soft foundation; Described gravel bed course is provided with roadbed, is equipped with road surface structare layer on the described roadbed; It is characterized in that: the side that described roadbed and abutment are adjacent forms a back filled region by the excavation unloading; Described roadbed is provided with transition slab at bridge head, and described transition slab at bridge head is positioned at the top, back filled region, and transition slab at bridge head one end is erected on the abutment bracket.
2. light road bank structure according to claim 1, it is characterized in that: described roadbed is divided into three sections successively: general highway section, transition zone and end of the bridge section; Transition zone and end of the bridge section all have the back filled region; The bottom surface of end of the bridge section back filled region is horizontal plane, and the bottom surface of transition zone back filled region is the inclined-plane.
3. light road bank structure according to claim 1 is characterized in that: be inserted with band drain or sand wick in the described soft foundation.
4. light road bank structure according to claim 1 and 2 is characterized in that: described back filled region adopts light material to fill.
5. light road bank structure according to claim 1, it is characterized in that: described transition slab at bridge head adopts the armored concrete slab of non-equal thickness.
6. light road bank structure according to claim 5, it is characterized in that: the length of described armored concrete slab is 8m.
CN2013201271181U 2013-03-20 2013-03-20 Light-mass embankment structure for managing bump at bridge head CN203174453U (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103572679A (en) * 2013-11-13 2014-02-12 河海大学 Embankment structure for reducing generation rate of bump at bridge head and filling method
CN103628376A (en) * 2013-11-20 2014-03-12 长安大学 Bridgehead vehicle bumping prevention structure based on concrete composite pavement and laying method thereof
CN103741595A (en) * 2014-01-21 2014-04-23 浙江省交通规划设计研究院 Bridge head structure for controlling bump at bridge head
CN104264581A (en) * 2014-10-21 2015-01-07 福州大学 Abutment earth pressure elimination based abutment structure and construction method
CN103614961B (en) * 2013-12-12 2015-06-10 西藏大学农牧学院 Stepped reinforced concrete slab capable of preventing abutment vehicle skips and construction method
CN105862595A (en) * 2015-01-20 2016-08-17 任丘市永基建筑安装工程有限公司 Construction technology of connecting abutment back of steel bridge and road
CN105908618A (en) * 2016-04-14 2016-08-31 江西博慧工程技术服务有限公司 Assembling type double layer bridge head overlapping board structure and construction method thereof
CN106087629A (en) * 2016-07-27 2016-11-09 浙江省交通规划设计研究院 Without conical slope prefabricated baffle plate foam concrete light road bank structure and construction method
CN108560422A (en) * 2018-01-18 2018-09-21 陇东学院 A kind of Bridge Seismic construction method combined based on two-ash soil and waste tire
CN110438884A (en) * 2019-07-12 2019-11-12 唐峰 A kind of novel bridge abutment structure

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103572679A (en) * 2013-11-13 2014-02-12 河海大学 Embankment structure for reducing generation rate of bump at bridge head and filling method
CN103572679B (en) * 2013-11-13 2016-01-06 河海大学 A kind of embankment structure and dam filling construction reducing bumping at bridge-head incidence
CN103628376A (en) * 2013-11-20 2014-03-12 长安大学 Bridgehead vehicle bumping prevention structure based on concrete composite pavement and laying method thereof
CN103614961B (en) * 2013-12-12 2015-06-10 西藏大学农牧学院 Stepped reinforced concrete slab capable of preventing abutment vehicle skips and construction method
CN103741595A (en) * 2014-01-21 2014-04-23 浙江省交通规划设计研究院 Bridge head structure for controlling bump at bridge head
CN104264581A (en) * 2014-10-21 2015-01-07 福州大学 Abutment earth pressure elimination based abutment structure and construction method
CN105862595A (en) * 2015-01-20 2016-08-17 任丘市永基建筑安装工程有限公司 Construction technology of connecting abutment back of steel bridge and road
CN105908618A (en) * 2016-04-14 2016-08-31 江西博慧工程技术服务有限公司 Assembling type double layer bridge head overlapping board structure and construction method thereof
CN106087629A (en) * 2016-07-27 2016-11-09 浙江省交通规划设计研究院 Without conical slope prefabricated baffle plate foam concrete light road bank structure and construction method
CN108560422A (en) * 2018-01-18 2018-09-21 陇东学院 A kind of Bridge Seismic construction method combined based on two-ash soil and waste tire
CN110438884A (en) * 2019-07-12 2019-11-12 唐峰 A kind of novel bridge abutment structure

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Address after: No. 89 round City West Road, Xihu District, Hangzhou, Zhejiang

Patentee after: Zhejiang transportation planning and Design Research Institute Co., Ltd.

Address before: No. 89 round City West Road, Xihu District, Hangzhou, Zhejiang

Patentee before: Zhejiang Provincial Plan Design&Research Institute of Communications

CP01 Change in the name or title of a patent holder