CN103114521B - Structure and construction method of junction position of bridge abutment and roadbed - Google Patents
Structure and construction method of junction position of bridge abutment and roadbed Download PDFInfo
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- CN103114521B CN103114521B CN201310020483.7A CN201310020483A CN103114521B CN 103114521 B CN103114521 B CN 103114521B CN 201310020483 A CN201310020483 A CN 201310020483A CN 103114521 B CN103114521 B CN 103114521B
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Abstract
The invention discloses a structure and a construction method of a junction position of a bridge abutment and a subgrade. The structure of the junction position of the bridge abutment and the subgrade comprises a soil body subgrade (5), concrete pavement (6), and a bridge abutment (4). The soil body subgrade (5) is connected with the back of the bridge abutment (4), ear-walls are arranged at the back of an abutment body (2), and an abutment back (10) is formed by the soil body subgrade (5) between the two ear-walls, horizontal steel bars (9), and concrete. Length-degressive thin wall tubular piles (11) and length and density degressive soil nails (12) are arranged in the soil body subgrade (5) which extends from the abutment back (10) along the length direction of the concrete pavement (6). The construction method of the junction position of the bridge abutment and the subgrade includes the critical steps of fixing the horizontal steel bars (9) on steel frame of the abutment body (2) and ear-wall steel bar cage, and nailing length-degressive thin wall tubular piles (11) and soil nails (12) into the soil body subgrade (5). With the structure and the construction method of the junction position of the bridge abutment and the subgrade, vehicle dumping can be avoided.
Description
Technical field
The present invention relates to technical field of bridge engineering, is specifically a kind of abutment of bridge and the structure of roadbed junction and construction method.
Background technology
The abutment of bridge refers to and is positioned at bridge two ends and the supporting superstructure be connected with roadbed and bear the structure of the pressure that bankets at the abutment back side (namely away from the one side in river course).Its function, except transmitting the load of bridge superstructure to except basis, also has the pressure that bankets of keeping out the abutment back side, the effect of stablizing Bridgehead by Blastig, bridge floor and road surface reliably and being reposefully connected.
The abutment of the bridge of prior art and the structure of roadbed junction as follows: abutment comprises platform cap, abutment body and concrete foundation and cushion cap, abutment body is cast on cushion cap, platform cap is cast in the end face of abutment body, bridge plate is shelved on the abutment body end face of abutment, the back side of abutment body is namely cast with the parallel ear wall of twice away from the one side in river course along the length direction on road surface, the back side of abutment body i.e. abutment body are connected with subgrade soil away from the one side in river course, subgrade soil upper has rigid pavement, and the end face of the end face on road surface, the platform cap of abutment is substantially concordant with bridge floor three.
The construction method of the abutment of the bridge of prior art and the structure of roadbed junction is as follows: the heatable adobe sleeping platform first digging out accommodating abutment in the position by river course, then the cushion cap of abutment, abutment body, platform cap and ear wall is poured into a mould successively, and by the abutment body end face of the ends rest of bridge plate at abutment, again by the heatable adobe sleeping platform earthen backfill between abutment and soil body roadbed and compacting, soil body roadbed and the abutment back side are drawn close namely makes soil body roadbed be connected with the abutment back side, finally in soil body roadbed upper rigid pavement.
There is following defect in the abutment of the bridge that prior art construction method is constructed out and the structure of roadbed junction: because abutment is rigidity abutment, rigidity is large, and the subgrade stiffness of roadbed especially in weak soil ground is little, like this, the sudden change of a rigidity is there is between rigidity abutment and roadbed, under the active force of vehicle, bridge floor and road surface all can produce certain sedimentation and deformation, and the sudden change of rigidity can make the sedimentation and deformation amplitude difference on bridge floor and road surface larger, cause producing very large difference in height between the two, generally, be exactly that the few roadbed subsidence of bridge floor sedimentation is many, difference in height makes to form step between the two, cause vehicle, through this position, bumping at bridge-head occurs, directly impact driving is comfortable and safe.
Summary of the invention
The technical problem that the present invention will solve is, provides a kind of abutment of bridge and the structure of roadbed junction that can avoid driving generation bumping at bridge-head situation.
A technical solution of the present invention is, a kind of abutment of bridge and the structure of roadbed junction are provided, it comprises soil body roadbed, rigid pavement and by cushion cap, the abutment that abutment body and platform cap are formed, abutment body is cast on cushion cap, platform cap is cast in the end face of abutment body, the bridge plate of bridge is shelved on the end face of abutment body, soil body roadbed is connected with the back side of abutment, rigid pavement is cast on soil body roadbed, the parallel ear wall of twice is built along the length direction of rigid pavement in the back side of abutment body, abutment body is embedded with many and protrudes the back side of abutment bodies and stretch into the horizontal steel bar of soil body roadbed, per pass ear wall is also embedded with the many medial surfaces protruding ear walls and stretches into the horizontal steel bar of soil body roadbed, every root horizontal steel bar is wrapped with concrete, soil body roadbed between twice ear wall, whole horizontal steel bar and the concrete be wrapped in outside horizontal steel bar form the platform back of the body, the thin-wall pipe pile that many row's length is successively decreased is provided with in the soil body roadbed extended from the platform back of the body along rigid pavement length direction, the soil nailing that many length and density are all successively decreased is provided with in the soil body roadbed extended from the platform back of the body along rigid pavement length direction.
Another technical problem that the present invention will solve is, provides a kind of and can avoid the drive a vehicle abutment of bridge of generation bumping at bridge-head situation and the construction method of the structure of roadbed junction.
Another technical solution of the present invention is, provide the construction method of a kind of abutment of bridge and the structure of roadbed junction, its step comprises:
A, the heatable adobe sleeping platform leaning on the position in river course to dig out accommodating abutment;
B, hole bottom pour mold note cushion cap;
C, on cushion cap, place the cage of reinforcement of the good abutment body of colligation, and on cage of reinforcement, fix many horizontal steel bars, fix the template of abutment body again, the template at the abutment body back side is provided with and every root horizontal steel bar through hole one to one, every root horizontal steel bar stretches out the template at the abutment body back side from through hole, fluid concrete, makes it to form abutment body and many horizontal steel bars are protruded at the back side of abutment body, then the template of abutment body of dismantling;
D, end face pouring platform cap at abutment body;
E, by the end face of the ends rest of bridge plate at abutment body;
The reinforcing cage of f, colligation two ear wall, and on ear wall reinforcing cage fixed level to reinforcing bar, the template of fixing ear wall, the template of the inner side of ear wall is provided with and every root horizontal steel bar through hole one to one, every root horizontal steel bar protrudes the template of ear side within the walls from through hole, cast ear wall concrete, then ear wall form of dismantling;
G, with the soil body backfill abutment and soil body roadbed between heatable adobe sleeping platform, the back side of the abutment body of soil body roadbed and abutment is finally made to close up, in the process of banketing, every root horizontal steel bar wraps up by fluid concrete, and with the soil body, each horizontal steel bar and concrete are buried, the soil body roadbed between twice ear wall, all horizontal steel bar and the concrete be wrapped in outside horizontal steel bar form the platform back of the body;
H, squeeze into and arrange thin-wall pipe pile more again in soil body roadbed, the many thin-wall pipe piles of same row are apart from equal, and the length of many row's thin-wall pipe piles is successively decreased from the platform back of the body along rigid pavement length direction;
I, in soil body roadbed, squeeze into many soil nailings, the length of soil nailing and density are successively decreased from the platform back of the body successively along rigid pavement length direction;
J, shelve one deck steel mesh reinforcement, and the top of every root soil nailing and steel mesh reinforcement are fixed, and every root thin-wall pipe pile is fixed through connecting reinforcement and steel mesh reinforcement, then fluid concrete, form soil nailing panel layer;
K, on soil nailing panel layer, lay bed course levelling, then in bed course upper rigid pavement.
The abutment of bridge of the present invention and the structure of roadbed junction and construction method compared with prior art, have following remarkable advantage and beneficial effect:
Owing to being the platform back of the body of the globality be jointly made up of the concrete of horizontal steel bar, horizontal steel bar outer wrapping and soil body roadbed closest to the platform back of the body of abutment, its rigidity increases, and namely a rigidity specific rigidity bridge floor rigidity of the platform back of the body is smaller, and being provided with from the soil body roadbed that the platform back of the body extends along the length direction on road surface the thin-wall pipe pile successively decreased highly successively, the thin-wall pipe pile highly successively decreased serves the effect of the elastic support of support upper pressure, and its rigidity is also carry on the back road surface from platform to successively decrease gently successively, moreover be provided with many soil nailings successively in the soil body roadbed extended from the platform back of the body along the length direction on road surface, the density of soil nailing and highly also successively decreasing gently successively on road surface dorsad from platform, the frictional force of soil nailing and the soil body can strengthen the rigidity of soil body roadbed, namely the existence of soil nailing also makes the rigidity of carrying on the back road surface from platform successively decrease successively, therefore carry on the back at the platform of globality, under the acting in conjunction of thin-wall pipe pile and soil nailing, the junction that the rigidity of one is successively decreased gently is there is between mud jacking by duct and prevailing roadway, make mud jacking by duct, joint portion, rigidity between prevailing roadway three is successively decreased gently, thus cause bridge floor, joint portion, the sedimentation and deformation amplitude of road surface three increases i.e. bridge floor gently, joint portion, road surface three seamlessly transit, and step can not be produced due to the drastic change of sedimentation and deformation amplitude, this just effectively prevent in driving conditions the situation occurring bumping at bridge-head, ensure the comfortable and safe of driving.
As improvement, one deck soil nailing panel layer is also cast with between soil body roadbed and rigid pavement, one deck steel mesh reinforcement is also provided with in soil nailing panel layer, top and the steel mesh reinforcement of every root soil nailing are fixed, and every root thin-wall pipe pile is fixed through connecting reinforcement and steel mesh reinforcement, like this, steel mesh reinforcement can make whole soil nailing and whole thin-wall pipe pile form an entirety, the rigidity of final increasing soil body roadbed, reduces the poor rigidity of soil body roadbed and mud jacking by duct further, makes from bridge floor to road surface more smooth-going.
As improving again, the array pitch of many rows thin-wall pipe pile is equal, the spacing of the thin-wall pipe pile of same row is also equal, the uniform force of soil body roadbed can be made so reasonable, the rigidity of final increasing soil body roadbed, the poor rigidity of further minimizing soil body roadbed and mud jacking by duct, makes from bridge floor to road surface more smooth-going.
As also improving, the many horizontal steel bars being embedded in abutment body are distributed in the multilayer of differing heights, and the many horizontal steel bars of every layer equidistantly distribute; Be embedded in the multilayer that ear many horizontal steel bars within the walls are also distributed in differing heights, also equidistantly distribute with layer much higher horizontal steel bar, like this, many horizontal steel bars of different layers define stereoeffect, stressed more reasonable, effectively can strengthen platform back of the body rigidity, reduce the platform back of the body and the poor rigidity of mud jacking by duct, make bridge floor more smooth-going to the platform back of the body.
As further improvement, the concrete be wrapped in outside horizontal steel bar is fast rigid concrete, like this can the reduction of erection time.
Accompanying drawing explanation
Fig. 1 is the sectional structure schematic diagram (for making Fig. 1 clear, saving ear wall in Fig. 1) of the abutment of bridge of the present invention and the structure of roadbed junction.
Fig. 2 is the plan structure schematic diagram of the abutment of bridge of the present invention and the structure of roadbed junction.
Shown in figure 1, cushion cap, 2, abutment body, 3, platform cap, 4, abutment, 5, soil body roadbed, 6, rigid pavement, 7, bridge plate, 8, ear wall, 9, horizontal steel bar, 10, the platform back of the body, 11, thin-wall pipe pile, 12, soil nailing, 13, steel mesh reinforcement, 14, soil nailing panel layer, 15, connecting reinforcement.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1 and Figure 2, the abutment of bridge of the present invention and the structure of roadbed junction, the abutment 4 that it comprises soil body roadbed 5, rigid pavement 6 and is made up of cushion cap 1, abutment body 2 and platform cap 3.Abutment body 2 is cast on cushion cap 1, and platform cap 3 is cast in the end face of abutment body 2, and the ends rest of the bridge plate 7 of bridge is at the end face of abutment body 2.Soil body roadbed 5 is connected with the back side of abutment 4, and in particular, the back side at abutment 4 drawn close by soil body roadbed 5, and the soil pressure of soil body roadbed 5 is born at the back side of abutment 4.Rigid pavement 6 is cast on soil body roadbed 5.The parallel ear wall 8 of twice is built, together with ear wall 8 is cast in abutment body 2 along the length direction of rigid pavement 6 in the back side of abutment body 2.The end face of rigid pavement 6, platform cap 3 is roughly concordant with the junction of bridge floor three, seamlessly transits.Abutment body 2 is embedded with many and protrudes the back side of abutment bodies 2 and stretch into the horizontal steel bar 9 of soil body roadbed 5, and the many horizontal steel bars 9 being namely embedded in abutment body 2 are distributed in the multilayer of differing heights, and the many horizontal steel bars 9 of every layer equidistantly distribute; As abutment body 2 is embedded with the horizontal steel bar 9 of 4 layers, every layer is 9 equally spaced horizontal steel bars 9.Described horizontal steel bar 9 refers to approximate horizontal, but in practice of construction, may have certain inclination instead of completely absolute level.Per pass ear wall 8 is also embedded with the many medial surfaces protruding ear walls 8 and stretches into the horizontal steel bar 9 of soil body roadbed 5, namely the many horizontal steel bars 9 be embedded in ear wall 8 are also distributed in the multilayer of differing heights, also equidistantly distribute with layer much higher horizontal steel bar 9, as being embedded with the horizontal steel bar 9 of 4 layers in ear wall 8, every layer is 4 equally spaced horizontal steel bars.Every root horizontal steel bar 9 is wrapped with fast rigid concrete, as the concrete of sulphate aluminium cement.Soil body roadbed 5 between twice ear wall 8, all horizontal steel bar 9 and be wrapped in the platform back of the body 10 of globality of the fast rigid concrete Special composition solid outside horizontal steel bar 9.The roughly vertical thin-wall pipe pile 11 that many row's length is successively decreased is provided with in the soil body roadbed 5 extended from the platform back of the body 10 along rigid pavement 6 length direction; Described roughly vertically refers in practice of construction, may have certain inclination instead of completely absolute vertical.The array pitch of many rows thin-wall pipe pile 11 is equal, the spacing of the thin-wall pipe pile 11 of same row is also equal, if the array pitch of arranging thin-wall pipe pile 11 is 5m more, and the spacing of often arranging thin-wall pipe pile 11 is also 5m, in other words, distance between adjacent two row's thin-wall pipe piles 11 is 5m, and the distance of often arranging every two adjacent thin-wall pipe piles 11 is also 5m, the length of the thin-wall pipe pile 11 of same row is equal, the length of the thin-wall pipe pile 11 of different row shortens gradually, length as the row's thin-wall pipe pile 11 near the platform back of the body 10 is 12m, second row length is 6m, 3rd row's length is 3m, 4th to arrange the namely destage back of the body 10 length be farthest 2m.The roughly vertical soil nailing 12 that many length and density are all successively decreased is provided with in the soil body roadbed 5 extended from the platform back of the body 10 along rigid pavement 6 length direction, length successively decrease be soil nailing 12 length along with away from platform the back of the body 10 distance increase and constantly successively decrease, if soil nailing 12 length closest to the platform back of the body 10 is 5m, soil nailing 12 increases along with the distance of carrying on the back 10 with platform and shortens gradually, and the length of the destage back of the body 10 soil nailing 12 is farthest 2m.The density of soil nailing 12 refer to every square metre in the radical of soil nailing, it is many that soil nailing 12 radical of in 10 close region soil body roadbeds 5 every square metre carried on the back by destage, soil nailing 12 is intensive, then along with the distance of the destage back of the body 10 increases the reduction of soil nailing 12 density, soil nailing 12 distributes thinning dredging, and in the soil body roadbed 5 in the maximum region of distance of the destage back of the body 10, the radical of soil nailing 12 of every square metre is minimum.Also be cast with one deck soil nailing panel layer 14 between soil body roadbed 5 and rigid pavement 6, in soil nailing panel layer 14, be also provided with one deck steel mesh reinforcement 13.Top and the steel mesh reinforcement 13 of every root soil nailing 12 are fixed, and specifically, soil nailing 12 comprises anchor tube, and anchor tube sinks in soil by people, then just define soil nailing 12 to fluid concrete in anchor tube, and the top of the anchor tube of soil nailing 12 is welded with steel mesh reinforcement 13.Every root thin-wall pipe pile 11 is fixed through connecting reinforcement 15 and steel mesh reinforcement 13, specifically, connecting reinforcement 15 is L shape, is cast with concrete in thin-wall pipe pile 11, the perpendicular muscle of L shape connecting reinforcement 15 is anchored in the concrete of thin-wall pipe pile 11, and the horizontal bar of L shape connecting reinforcement 15 welds with steel mesh reinforcement 12.
As shown in Figure 1 and Figure 2, the construction method of the abutment of bridge of the present invention and the structure of roadbed junction, its step comprises as follows.
A, the heatable adobe sleeping platform leaning on the position in river course to dig out accommodating abutment 4.
B, hole bottom pour mold note cushion cap 1.
C, on cushion cap 1, place the cage of reinforcement of the good abutment body of colligation 2, and on cage of reinforcement, fix many horizontal steel bars 9, fix the template of abutment body 2 again, the template at the back side of abutment body 2 is provided with and every root horizontal steel bar 9 through hole one to one, every root horizontal steel bar 9 stretches out the template at abutment body 2 back side from through hole, fluid concrete, make it to form abutment body 2 and many horizontal steel bars 9 are protruded at the back side of abutment body 2, to dismantle again the template of abutment body 2, to extract out along horizontal steel bar 9 during the template at the back side of abutment body 2 of dismantling, avoid bending horizontal steel bar 9 as far as possible.
D, conventionally the good platform cap 3 of the end face colligation of abutment body 2 cage of reinforcement, lay template pouring platform cap 3.
E, one end of bridge plate 7 is shelved on the end face of this abutment body 2, the other end of bridge plate 7 is shelved on the end face of the abutment body 2 of another abutment 4.
The reinforcing cage of f, colligation two ear wall 8, and on ear wall 8 reinforcing cage fixed level to reinforcing bar 9, the template of fixing ear wall 8, the template of the inner side of ear wall 8 is provided with and every root horizontal steel bar 9 through hole one to one, every root horizontal steel bar 9 protrudes the template inside ear wall 8 from through hole, cast ear wall 8 concrete, then ear wall 8 template of dismantling, to extract out along horizontal steel bar 9 during the template of medial surface of ear wall 8 of dismantling, avoid bending horizontal steel bar 9 as far as possible.
G, with the heatable adobe sleeping platform between soil body backfill abutment 4 and soil body roadbed 5, the back side of abutment body 2 of soil body roadbed 5 and abutment 4 and the back side of cushion cap 1 is finally made to close up, in the process of banketing, pour into a mould fast rigid concrete every root horizontal steel bar 9 is wrapped up, and with the soil body, each horizontal steel bar 9 and fast rigid concrete are buried, banket to the end face absolute altitude of soil body roadbed 5, compacted fill, soil body roadbed 5 between twice ear wall 8 and the whole horizontal steel bars 9 be imbedded in soil body roadbed 5 and fast rigid concrete form all-in-one-piece the back of the body 10 of the larger space multistory of rigidity.
H, squeezing into many row's thin-wall pipe piles 11 in soil body roadbed 5, the many thin-wall pipe piles 11 of same row are apart from equal, and the spacing of the thin-wall pipe pile 11 of same row is also equal, and the length of many row's thin-wall pipe piles 11 is successively decreased from the platform back of the body 10 along rigid pavement 6 length direction.
I, in soil body roadbed 5, squeeze into many soil nailings 12, the length of soil nailing 12 and density are successively decreased from the platform back of the body 10 successively along rigid pavement 6 length direction; The mode of beating soil nailing 12 belongs to prior art, as squeezed in soil by the hollow anchor tube of soil nailing, then from anchor tube top fluid concrete, forms soil nailing 12.The density of soil nailing 12 refer to every square metre in the radical of soil nailing 12.
J, shelve one deck steel mesh reinforcement 13, and the top of every root soil nailing 12 and steel mesh reinforcement 13 are fixed, and the connecting reinforcement 15 of every root thin-wall pipe pile 11 through L shape is fixed with steel mesh reinforcement 13, perpendicular muscle by the connecting reinforcement 15 of L shape is anchored in the concrete of thin-wall pipe pile 11, and the horizontal bar of L shape connecting reinforcement 15 welds with steel mesh reinforcement 12; Fluid concrete again, forms soil nailing panel layer 14.
K, on soil nailing panel layer 14, lay bed course levelling, then in bed course upper rigid pavement 6.
Claims (1)
1. a construction method for the abutment of bridge and the structure of roadbed junction, is characterized in that: its step comprises:
A, the heatable adobe sleeping platform leaning on the position in river course to dig out accommodating abutment (4);
B, hole bottom pour mold note cushion cap (1);
C, at the upper cage of reinforcement placing the good abutment body (2) of colligation of cushion cap (1), and on cage of reinforcement, fix many horizontal steel bars (9), fix the template of abutment body (2) again, the template at abutment body (2) back side is provided with and every root horizontal steel bar (9) through hole one to one, every root horizontal steel bar (9) stretches out the template at abutment body (2) back side from through hole, fluid concrete, make it to form abutment body (2) and many horizontal steel bars (9) are protruded at the back side of abutment body (2), then the template of abutment body of dismantling (2);
D, end face pouring platform cap (3) at abutment body (2);
E, by the end face of ends rest in abutment body (2) of bridge plate (7);
The reinforcing cage of f, colligation two ear wall (8), and on ear wall (8) reinforcing cage fixed level to reinforcing bar (9), the template of fixing ear wall (8), the template of the inner side of ear wall (8) is provided with and every root horizontal steel bar (9) through hole one to one, every root horizontal steel bar (9) protrudes the template of ear wall (8) inner side from through hole, cast ear wall (8) concrete, then ear wall (8) template of dismantling;
G, to backfill heatable adobe sleeping platform between abutment (4) and soil body roadbed (5) with the soil body, soil body roadbed (5) is finally made to close up with the back side of abutment (4), in the process of banketing, every root horizontal steel bar (9) wraps up by fluid concrete, and with the soil body, each horizontal steel bar (9) and concrete are buried, the soil body roadbed (5) between twice ear wall (8), all horizontal steel bar (9) and be wrapped in horizontal steel bar (9) concrete outward and form platform and carry on the back (10);
H, squeeze in soil body roadbed (5) and arrange thin-wall pipe pile (11) more again, the many thin-wall pipe piles (11) of same row are apart from equal, and the length of arranging thin-wall pipe pile (11) is successively decreased from the platform back of the body (10) along rigid pavement (6) length direction more;
I, in soil body roadbed (5), squeeze into many soil nailings (12), the length of soil nailing (12) is successively decreased from the platform back of the body (10) successively along rigid pavement (6) length direction; In every square metre, the radical of soil nailing 12 successively decreases from the platform back of the body (10) successively along rigid pavement (6) length direction;
J, shelve one deck steel mesh reinforcement (13), and the top of every root soil nailing (12) and steel mesh reinforcement (13) are fixed, and every root thin-wall pipe pile (11) is fixed through connecting reinforcement (15) and steel mesh reinforcement (13), fluid concrete again, forms soil nailing panel layer (14);
K, on soil nailing panel layer (14), lay bed course levelling, then in bed course upper rigid pavement (6).
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| CN105887795B (en) * | 2016-06-07 | 2018-05-01 | 浙江大学 | The long counter-force loading preloading method of Abutment Back soft soil foundation gradual change stake |
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