CN212895900U

CN212895900U - Gravity type U-shaped abutment rear drainage structure

Info

Publication number: CN212895900U
Application number: CN202021546985.5U
Authority: CN
Inventors: 赵振军; 赵宇; 王阳; 刘新; 唐震; 陈刚
Original assignee: Wisdri Engineering and Research Incorporation Ltd; Wisdri Urban Construction Engineering Technology Co Ltd
Current assignee: Wisdri Engineering and Research Incorporation Ltd; Wisdri Urban Construction Engineering Technology Co Ltd
Priority date: 2020-07-30
Filing date: 2020-07-30
Publication date: 2021-04-06
Anticipated expiration: 2030-07-30

Abstract

The utility model discloses a drainage structures behind gravity type U type abutment, enlarge the basis including the abutment, be equipped with the abutment side wall of abutment front wall and two relative settings on the abutment enlarges the basis, the both ends of abutment front wall are connected with the front end of two abutment side walls respectively, enclose into between abutment front wall and two abutment side walls to be equipped with clay tamp district in the space, transversely be equipped with rubble drainage blanket in the clay tamp district, the vertical a plurality of rubble infiltration ditches that are equipped with in rubble drainage blanket's the top. The invention has simple construction, improves the drainage efficiency, obviously enhances the bearing capacity of the filling soil behind the platform, and reduces the post-construction settlement of the filling soil behind the platform, thereby effectively reducing the probability of frost heaving of the roadbed at the back of the platform and bumping at the bridge head.

Description

Gravity type U-shaped abutment rear drainage structure

Technical Field

The utility model relates to a bridge highway technical field, concretely relates to drainage structures behind gravity type U type abutment platform.

Background

In the prior art, a bridge transition section is a difficult point in road construction, and the differential settlement of a bridge structure and a platform back roadbed can cause the phenomenon of bumping at the bridge head in different degrees. There are various causes of a bump at the bridge end, for example: the foundation under the abutment filling soil is subjected to post-construction consolidation settlement, the structural difference between the abutment and the roadbed, the compaction deformation of the abutment filling and the like. And because the infiltration of surface water that causes such as road surface fracture can accelerate the consolidation settlement of abutment under the abutment back of the bridge and the filled soil to aggravate the bridge head and jump the car disease, especially to gravity type U type abutment, the trilateral fender that encloses that abutment front wall and side wall enclose can hinder the getting rid of surface water, thereby changes and forms ponding behind the bridge between the filler. On the other hand, the accumulated water on the abutment back is easy to freeze in winter, so that the roadbed is frozen and expanded, and the abutment back of the abutment can be damaged by serious people.

The conventional gravity type U-shaped bridge abutment post-drainage treatment method is realized by arranging a drainage impervious layer behind an abutment or arranging a drainage blind ditch in an enlarged foundation, and when the height of the post-abutment filler is larger, the accumulated water in the post-abutment filler cannot be completely removed by the two methods due to the increase of a seepage path. There is therefore still room for improvement in the prior art measures.

Disclosure of Invention

The to-be-solved technical problem of the utility model is, to the above-mentioned defect that prior art exists, provide a drainage structures behind gravity type U type abutment, the construction is simple and convenient, has improved drainage efficiency, still is showing the bearing capacity that has strengthened the back filled out soil of platform, has reduced the post-construction settlement of back filled out soil of platform to the probability that abutment back road bed frost heaving and bridgehead jump car disease take place has effectively been reduced.

The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be:

the utility model provides a drainage structures behind gravity type U type abutment, enlarges the basis including the abutment, is equipped with the abutment side wall of abutment front wall and two relative settings on the abutment enlarges the basis, and the both ends of abutment front wall are connected with the front end of two abutment side walls respectively, encloses into between abutment front wall and two abutment side walls to be equipped with clay tamp district in the space, transversely is equipped with rubble drainage blanket in the clay tamp district, and the vertical a plurality of rubble oozing ditches that are equipped with in rubble drainage blanket's the top.

According to the technical scheme, a layer of impermeable geotextile is laid below the gravel drainage layer, and a layer of reverse filter geotextile is laid above the gravel drainage layer.

According to the technical scheme, the two side walls of the gravel seepage ditch are laid with the anti-filtration geotextile,

according to above-mentioned technical scheme, the lower extreme and the rubble drainage blanket intercommunication of rubble infiltration ditch, the upper end and the road bed place face of rubble infiltration ditch are connected, and the rubble drainage blanket sets up in the full width range of road bed cross section.

According to the technical scheme, the roadbed is arranged above the clay tamping area, the abutment cap is arranged at the upper end of the abutment front wall, and the bridge head butt strap is connected between the roadbed and the abutment cap.

According to the technical scheme, a broken stone blind ditch is arranged below the joint between the roadbed and the bridge end butt strap.

According to the technical scheme, impermeable geotextiles are wrapped on the two sides and the lower part of the macadam blind ditch, and reverse filter geotextiles are laid on the upper part of the macadam blind ditch.

According to the technical scheme, the broken stone drainage layer is arranged at the middle lower part of the clay tamping area.

According to the technical scheme, the slope of the gravel drainage layer along the two transverse sides is A, and the slope of the gravel drainage layer along the longitudinal rear side is B.

According to the technical scheme, the inclination A is 1-2%, and the inclination B is 4-6%.

The utility model discloses following beneficial effect has:

the invention starts from the structural construction of a common gravity type U-shaped abutment, starts from the aspect of rainwater seepage path, has reasonable and reliable structural design and simple and convenient construction, not only solves the problems of poor drainage effect and low drainage efficiency in the prior art, improves the drainage efficiency, but also obviously enhances the bearing capacity of the filling soil behind the abutment and reduces the post-construction settlement of the filling soil behind the abutment, thereby effectively reducing the probability of frost heaving of a roadbed at the abutment and the occurrence of bumping at the bridge head.

Drawings

Fig. 1 is a schematic structural diagram of a gravity type U-shaped bridge platform rear drainage structure in an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

in the figure, 1-abutment enlarged foundation, 2-side wall, 3-front wall, 4-clay tamping zone, 5-gravel drainage layer, 5-1-first impermeable geotextile, 5-2-first reverse filter geotextile, 6-gravel seepage ditch, 6-1-third reverse filter geotextile, 7-gravel blind ditch, 7-1-second impermeable geotextile, 7-2-second reverse filter geotextile, 8-abutment cap, 9-bridge head butt strap and 10-beam plate.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

Referring to fig. 1-2, the utility model provides a drainage structures behind gravity type U type abutment in embodiment, enlarge basis 1 including the abutment, be equipped with abutment front wall 3 and two abutment side walls 2 that set up relatively on the abutment enlarges basis 1, the both ends of abutment front wall 3 are connected with the front end of two abutment side walls 2 respectively, enclose between abutment front wall 3 and two abutment side walls 2 and be equipped with clay tamp district 4 in the space, transversely be equipped with rubble water drainage layer 5 in clay tamp district 4, the vertical a plurality of rubble oozing ditches 6 that are equipped with in rubble water drainage layer 5's top, rubble oozing ditch 6 sets up in clay tamp district 4.

Furthermore, a first anti-seepage geotextile 5-1 is laid below the gravel drainage layer 5, and a first reverse filter geotextile 5-2 is laid above the gravel drainage layer 5.

Furthermore, the two side walls of the gravel seepage ditch 6 are laid with third reversed filter geotextile 6-1,

further, the lower extreme and the rubble drainage blanket 5 intercommunication of rubble infiltration ditch 6, the upper end and the road bed place face of rubble infiltration ditch 6 are connected, and rubble drainage blanket 5 sets up in the full width within range of road bed cross section.

Further, a roadbed is arranged above the clay tamping area 4, a platform cap 8 is arranged at the upper end of the abutment front wall 3, and a bridge head butt strap 9 is connected between the roadbed and the platform cap 8.

Further, the outer end of the table cap 8 is connected with a beam plate 10.

Furthermore, a rubble blind ditch 7 is arranged below the joint between the roadbed and the bridge end butt strap 9.

Furthermore, second anti-seepage geotextiles 7-1 are wrapped on the two sides and the lower part of the macadam blind ditch 7, and a second reverse filtering geotextile 7-2 is laid on the upper part of the macadam blind ditch 7.

Further, a gravel drainage layer 5 is arranged at the middle lower part of the clay tamping zone 4.

Furthermore, the inclination of the gravel drainage layer 5 along the two transverse sides is A, and the inclination of the gravel drainage layer 5 along the longitudinal rear side is B.

Furthermore, the inclination A is 1-2%, and the inclination B is 4-6%.

The utility model discloses a theory of operation:

the utility model provides a drainage structures behind gravity type U type abutment, includes abutment enlarged footing 1, and 1 top both sides of abutment enlarged footing are equipped with abutment side wall 2, and 1 top front end of abutment enlarged footing is equipped with abutment front wall 3. Above the abutment enlarged foundation 1, a clay tamping zone 4 is arranged, and a gravel drainage layer 5 is arranged on the clay tamping zone 4. And an impermeable geotextile layer is arranged below the gravel drainage layer 5, and a reverse filter geotextile layer is arranged above the gravel drainage layer. The gravel drainage layer 5 top is equipped with clay tamp district 4 to be provided with a plurality of gravel infiltration ditches 6, the gravel infiltration ditches 6 quantity need be confirmed according to local rainfall and drainage needs, the gravel infiltration ditches 6 both sides wall is laid and is prevented straining geotechnological cloth. The bridge abutment is characterized in that a abutment cap 8 is arranged above the bridge abutment front wall 3, a bridge head butt plate 9 is arranged above the abutment cap 8, and a broken stone blind ditch 7 is arranged at the bottom of the joint of the bridge head butt plate 9 and the roadbed. Two sides and the lower part of the macadam blind ditch 7 are wrapped by impermeable geotextile, and the upper part is coated by reverse filter geotextile.

In the scheme, the gravel drainage layer 5 is arranged in parallel with the two side walls 2 of the abutment in the longitudinal direction and inclines for 4-6% towards the rear of the abutment to form a drainage longitudinal slope. The gravel drainage layer 5 transversely inclines to 1-2% of the two sides of the abutment to form a drainage cross slope. The gravel drainage layer 5 is arranged in the full-width range of the cross section of the roadbed.

In the above scheme, rubble infiltration ditch 6 is for setting up in the full width scope of road bed cross section, and the bottom is linked together with rubble drainage blanket 5, rubble infiltration ditch 6 not only can accelerate the infiltration of road bed water, still can play the effect of rubble stake, strengthens the bearing capacity of the back filled-up of platform, reduces the post-construction settlement of the back filled-up of platform.

In this structural design, rubble oozes ditch 6 has the effect of fine collection, infiltration rainwater, and rubble drainage blanket 5 has the effect of fine drainage and prevention rainwater infiltration. Inside back of entering into the road bed because of the road surface breaks when the rainwater behind the abutment, rubble infiltration ditch 6 can effectively collect the rainwater of infiltration to make the rainwater enter into rubble drainage blanket 5 along rubble infiltration ditch 6 in, the rethread rubble drainage blanket 5 indulges, the cross slope gets rid of the rainwater to the road bed outside, flows to the road bed escape canal through the mode of side slope overflow at last. In addition, as the road surface structure at the joint of the bridge head butt strap 9 and the roadbed is easy to generate transverse cracking, the broken stone blind ditch 7 arranged below the joint of the bridge head butt strap 9 and the roadbed can drain rainwater seeping from the crack to the outside of the roadbed.

The invention also aims to provide a construction method of the gravity type U-shaped abutment rear drainage structure, which comprises the following steps:

step one, after the bridge abutment reinforcing steel bars are bound, pouring bridge abutment concrete and maintaining to 80% of the designed strength.

And step two, filling the clay tamping zone 4 layer by layer, wherein the filling thickness of each layer is not more than 30cm, and the layers are tamped layer by using a small machine, and the tamping degree meets the design requirement after tamping.

And step three, when the clay tamping zone 4 is filled to the broken stone drainage layer 5, paving a layer of impermeable geotextile on the top surface of the clay tamping zone 4.

And fourthly, constructing a gravel drainage layer 5. The thickness of the gravel drainage layer 5 is 20cm, and the gravel cannot be crushed by using a small machine for tamping.

And fifthly, laying reverse filtering geotextile, and constructing a clay tamping area 4 layer by layer. The thickness of each layer of the clay tamping zone 4 is not more than 30cm, and the clay tamping zone is tamped by a small machine, and the tamping degree after tamping meets the design requirement. After each layer of clay tamping zone 4 is filled, excavating a groove according to design requirements, laying reverse filter geotextile in two side walls, filling broken stones in the groove, completing construction of the broken stone infiltration ditch 6 of the layer, tamping the broken stone infiltration ditch 6 by using a small machine, and ensuring that the compaction degree meets the design requirements.

And step six, according to the construction method in the step five, upwards constructing the clay tamping area 4 and the gravel seepage ditches 6 layer by layer until the clay tamping area and the gravel seepage ditches are filled on the top surface of the roadbed. It should be noted that the anti-filtration geotextile of each gravel seepage ditch 6 should be lapped, and the lapping length should not be less than 15 cm.

And seventhly, excavating the groove, constructing a rubble blind ditch 7 below the bridge head butt plate 9, wherein the cross section of the rubble blind ditch 7 is 15cm multiplied by 15cm and is arranged along the transverse through length of the road.

And step eight, mounting the bridge head butt strap 9.

The above is only a preferred embodiment of the present invention, and the scope of the right of the present invention should not be limited by this, so that the equivalent changes made in the claims of the present invention still belong to the protection scope of the present invention.

Claims

1. The utility model provides a drainage structures behind gravity type U type abutment, a serial communication port, enlarge the basis including the abutment, be equipped with abutment front wall and two abutment side walls that set up relatively on the abutment enlarges the basis, the both ends of abutment front wall are connected with the front end of two abutment side walls respectively, enclose into between abutment front wall and two abutment side walls and be equipped with the clay tamp district in the space, transversely be equipped with rubble drainage blanket in the clay tamp district, the vertical a plurality of rubble oozing ditches that are equipped with in rubble drainage blanket's the top.

2. A gravity type U-shaped abutment rear drainage structure according to claim 1, wherein a seepage-proofing geotextile is laid below the gravel drainage layer, and a reverse-filtering geotextile is laid above the gravel drainage layer.

3. A gravity type U-shaped abutment rear drainage structure according to claim 1, wherein the two side walls of the gravel infiltration trench are laid with anti-filtration geotextile.

4. A gravity type U-shaped abutment rear drainage structure according to claim 1, wherein the lower end of the gravel infiltration ditch is communicated with a gravel drainage layer, the upper end of the gravel infiltration ditch is connected with the surface of the roadbed, and the gravel drainage layer is arranged in the full width range of the cross section of the roadbed.

5. The gravity type U-shaped abutment rear drainage structure of claim 1, wherein a roadbed is arranged above the clay tamping area, an abutment cap is arranged at the upper end of a front wall of the abutment, and a bridge head butt strap is connected between the roadbed and the abutment cap.

6. A gravity type U-shaped abutment rear drainage structure according to claim 5, wherein a rubble blind ditch is arranged below the connection between the roadbed and the bridge head butt strap.

7. The gravity type U-shaped abutment rear drainage structure of claim 6, wherein impermeable geotextiles are wrapped at two sides and the lower part of the macadam blind ditch, and an anti-filtration geotextile is laid above the macadam blind ditch.

8. The gravity type U-shaped abutment rear drainage structure of claim 1, wherein a crushed stone drainage layer is arranged at the middle lower part of the clay tamping zone.

9. A gravity type U-shaped abutment rear drainage structure according to claim 1, wherein the gravel drainage layer has a transverse both-side inclination A and a longitudinal rear inclination B.

10. The gravity type U-shaped abutment rear drainage structure of claim 9, wherein the inclination A is 1-2% and the inclination B is 4-6%.