CN111622090A - Soft foundation lower abutment reinforcing construction method - Google Patents
Soft foundation lower abutment reinforcing construction method Download PDFInfo
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- CN111622090A CN111622090A CN202010453996.7A CN202010453996A CN111622090A CN 111622090 A CN111622090 A CN 111622090A CN 202010453996 A CN202010453996 A CN 202010453996A CN 111622090 A CN111622090 A CN 111622090A
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- abutment
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- bridge
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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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
Abstract
The application relates to a soft foundation lower abutment reinforcing construction method, which comprises the following steps: filling soil after the abutment of the abutment is removed; along the longitudinal direction of the bridge, in the range of the soft soil foundation, driving reinforcing piles for reinforcing the soft soil foundation into the two sides of the abutment; arranging a temporary buttress on a bearing platform of the bridge abutment, and jacking up the main beam through the temporary buttress until the main beam is separated from a bridge body and a rib plate of the bridge abutment; dismantling a body and a rib plate of the abutment; sequentially installing a newly-added pier and a newly-added support on the bearing platform from bottom to top; removing the temporary buttress to enable the main beam to descend and bear on the newly added support; and constructing a newly-built abutment at one end of the soft soil foundation close to the roadbed along the longitudinal bridge direction, and installing a newly-added main beam between the newly-built abutment and the newly-added support. Under the soft soil foundation among the correlation technique, and abutment, pier and girder all when being under construction completion, when carrying out the back filled soil construction of platform, because of the abutment takes place to incline or uneven settlement, cause the problem of stage body and floor fracture.
Description
Technical Field
The application relates to the field of reinforcing construction for inclined cracking of soft foundation lower abutment, in particular to a reinforcing construction method for soft foundation lower abutment.
Background
With the development of economy in China, traffic is greatly developed, and bridges across rivers and sea are increasingly increased. Due to the influence and limitation of the design, materials, construction and the like at the time, and the continuous appearance of overloaded vehicles, the load of the bridge is increasingly increased. Various problems of the old bridge should recover the bearing capacity of the old bridge and prolong the service life through proper reinforcement technology.
Aiming at the abutment under the soft soil foundation and in the construction process, the abutment is likely to crack due to improper maintenance, unreasonable arrangement of post-abutment drainage, uneven settlement of the foundation and the like, concrete maintenance can be enhanced and drainage can be enhanced in the construction process, as shown in figure 1, aiming at the soft soil foundation and the abutment 2, the pier 13 and the main beam 6 are all constructed, when the construction of the post-abutment filling 1, the abutment 2 is likely to incline and unevenly settle, the abutment body 21 and the rib plate 22 of the abutment 2 are cracked, the support is displaced, and the bridge safety is seriously damaged. In this case, since the main girder 6 and the like have been completed, the abutment 2 has been unsuitable for continuing to bear the load of the post-abutment fill 1. Obviously, the above problems cannot be solved by means of reinforced concrete curing and the like.
Disclosure of Invention
The embodiment of the application provides a soft foundation lower abutment reinforcing construction method, which aims to solve the problem that in the prior art, when the abutment, the pier and the main beam are constructed under a soft soil foundation and the earth filling construction is carried out after the abutment, the abutment is inclined or unevenly settled, so that the abutment body and the rib plate are cracked.
In a first aspect, a soft foundation lower abutment reinforcement construction method is provided, which includes the following steps:
filling soil after the abutment of the abutment is removed;
along the longitudinal direction of the bridge, in the range of the soft soil foundation, driving reinforcing piles for reinforcing the soft soil foundation into the two sides of the abutment;
arranging a temporary buttress on a bearing platform of the bridge abutment, and jacking up a main beam through the temporary buttress until the main beam is separated from a bridge body and a rib plate of the bridge abutment;
dismantling the abutment body and the rib plate of the abutment;
sequentially installing a newly-added pier and a newly-added support on the bearing platform from bottom to top;
the temporary buttress is dismantled so that the main beam descends and is loaded on the newly added support;
and constructing a newly-built abutment at one end of the soft soil foundation close to the roadbed along the longitudinal direction of the bridge, and installing a newly-added main beam between the newly-built abutment and the newly-added support.
In some embodiments, before jacking up a girder by the temporary buttress, the method further comprises: driving a newly-added pile foundation into at least one side of the abutment along the longitudinal bridge direction;
before installing newly-increased pier and newly-increased support in proper order from bottom to top on the cushion cap, the method still includes: and arranging a newly-added bearing platform on at least one side of the bearing platform along the longitudinal bridge direction, enabling the newly-added bearing platform to be positioned on the newly-added pile foundation, and enabling the newly-added bearing platform to be connected with the bearing platform to form an expanded bearing platform.
In some embodiments, the new platform is a steel platform.
In some embodiments, the method further comprises: and filling soil after a new abutment is constructed beside the newly-built abutment.
In some embodiments, the new filling after the platform is replaced adopts light concrete.
In some embodiments, the newly-built bridge abutment comprises a newly-built pile foundation inserted into the soft soil foundation, and a newly-built bearing platform, a newly-built platform body and a newly-built rib plate which are sequentially arranged from bottom to top.
In some embodiments, the temporary buttress is a steel-structure buttress, and/or the newly-added pier is a steel pier.
In some embodiments, the newly added main beam is a simply supported beam.
In some embodiments, the reinforcing pile is a high-pressure jet grouting pile, a powder spraying pile or a precast pile.
In some embodiments, the reinforcing piles have a diameter of 0.4m to 1 m.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a reinforcing construction method for an abutment under a soft foundation, the reinforcing construction method provided by the application unloads filling soil behind the abutment, reinforcing piles are adopted to reinforce part of a soft soil foundation around the abutment, a cracked abutment body and rib plates are dismantled and rebuilt into a newly-added pier and a newly-added support, finally, a newly-built abutment and a newly-added girder are added on one side of a roadbed of the newly-added pier, the newly-built abutment is smoothly connected with the roadbed, and the newly-added girder spans the range of the soft soil foundation, so that the problems of shifting and cracking of the abutment and the surrounding soft foundation are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a bridge provided in the related art in which the construction of abutment, pier, and girder has been completed on a soft soil foundation;
fig. 2 is a schematic view illustrating the insertion of reinforcing piles for reinforcing a soft soil foundation according to an embodiment of the present invention;
FIG. 3 is a schematic view of the platform and rib plates being removed according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a newly added bearing platform, a newly added pier and a newly added support according to an embodiment of the present application;
fig. 5 is a schematic view of the soft foundation lower abutment reinforcement provided in the embodiment of the present application after completion.
In the figure: 1. filling soil behind the platform; 2. an abutment; 20. a bearing platform; 21. a platform body; 22. a rib plate; 3. newly adding a pile foundation; 4. reinforcing piles; 5. temporary buttresses; 6. a main beam; 7. newly adding a bearing platform; 8. newly adding a bridge pier; 9. newly adding a support; 10. newly building a bridge abutment; 100. newly building a pile foundation; 101. building a bearing platform; 102. newly building a platform body; 103. newly building a ribbed slab; 11. newly adding a main beam; 12. filling soil after replacing the platform; 13. provided is a bridge pier.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a soft foundation lower abutment reinforcing construction method, which can solve the problem that in the prior art, when the abutment, a pier and a main beam are constructed and completed under a soft foundation and the filling construction is carried out after the abutment, the abutment is inclined or unevenly settled, so that the abutment body and rib plates are cracked.
A reinforcing construction method for a soft foundation lower abutment comprises the following steps:
s1: comparing fig. 1 and fig. 2, the filling 1 is filled after the abutment 2 is removed;
s2: referring to fig. 2, in the longitudinal direction of the bridge, within the range of the soft soil foundation, reinforcing piles 4 for reinforcing the soft soil foundation are driven into both sides of the abutment 2; the steps S1 and S2 may be performed simultaneously, or the reinforcing pile 4 may be constructed first and then the after-stage filling 1 may be removed.
S3: referring to fig. 2, a temporary buttress 5 is arranged on a bearing platform 20 of the bridge abutment 2, and the main beam 6 is jacked up by the temporary buttress 5 until the main beam 6 is separated from a body 21 and a rib plate 22 of the bridge abutment 2;
s4: referring to fig. 3, the abutment body 21 and the rib plate 22 of the abutment 2 are removed;
s5: referring to fig. 4, a newly added pier 8 and a newly added support 9 are sequentially installed on a bearing platform 20 from bottom to top;
s6: as shown in fig. 3 and 4, the temporary buttress 5 is removed, so that the main beam 6 descends and bears on the newly added support 9;
s7: referring to fig. 5, in the longitudinal direction of the bridge, a newly-built abutment 10 is constructed at one end of the soft soil foundation close to the roadbed, and a newly-added main beam 11 is installed between the newly-built abutment 10 and the newly-added support 9.
The reinforcing construction method provided by the application is used for unloading the filling soil 1 behind the abutment 2, reinforcing part of soft soil foundation around the abutment 2 by using the reinforcing piles 4, dismantling and rebuilding the cracked abutment body 21 and the ribbed slab 22 into the newly-added pier 8 and the newly-added support 9, and finally adding the newly-added abutment 10 and the newly-added girder 11 on one side of the roadbed of the newly-added pier 8, wherein the newly-added abutment 10 smoothly links the roadbed, and the newly-added girder 11 spans the range of the soft soil foundation, so that the problems of shifting and cracking of the abutment and the surrounding soft foundation are solved.
In some preferred embodiments, before the main girder 6 is jacked up by the temporary buttress 5, the method further comprises: referring to fig. 2, a newly-added pile foundation 3 is driven into at least one side of an abutment 2 along the longitudinal bridge direction; in fig. 2, newly added pile foundations are driven into two sides of the abutment 2, so that left and right balance can be guaranteed.
Before the newly added bridge piers 8 and the newly added supports 9 are sequentially installed on the bearing platform 20 from bottom to top, the method further comprises the following steps: referring to fig. 4, in the longitudinal bridge direction, at least one side of the bearing platform 20 is provided with the newly added bearing platform 7, the newly added bearing platform 7 is positioned on the newly added pile foundation 3, and the newly added bearing platform 7 is connected with the bearing platform 20 to form an enlarged bearing platform. In fig. 4, the newly added bearing platforms 7 are arranged on both sides of the bearing platform 20.
In this embodiment, the newly added bearing platform 7 can increase and enlarge the contact area between the bearing platform and the soft foundation to prevent settlement or inclination, and on the other hand, provides a sufficient support surface for the newly added pier 8.
And the addition of the newly-added pile foundation 3 can provide more sufficient supporting force for the newly-added bearing platform 7.
In some preferred embodiments, the newly added bearing platform 7 is a steel bearing platform, which has the advantages that, compared with a concrete bearing platform, the steel bearing platform is lighter, so that the steel bearing platform is convenient to hoist, and meets the weight reduction requirement relative to a soft soil foundation, and on the other hand, the steel bearing platform can be prefabricated and formed in a factory without cast-in-place, so that the construction period can be shortened.
Referring to fig. 5, in some preferred embodiments, a new post-abutment fill 12 is constructed alongside the newly-built abutment 10 to tamp the newly-built abutment 10.
In some preferred embodiments, lightweight concrete is used for the new filling 12. The light concrete has the advantages that the pressure of the abutment soil borne by the newly-built abutment 10 at the bridge head can be reduced, and the apparent density of the light concrete can be selected according to the actual construction requirements, for example, the apparent density is 5kN/m3The lightweight concrete of (1).
Referring to fig. 5, in some preferred embodiments, the newly-built abutment 10 includes a newly-built pile foundation 100 inserted into a soft foundation, and a newly-built bearing platform 101, a newly-built platform body 102 and a newly-built rib plate 103 which are arranged from bottom to top in sequence. Specifically, during construction, the newly-built abutment 10 can be selected from the same components as the original abutment 2, such as a bearing platform, a platform body, a rib plate and the like, and can be directly used without redesign.
In some preferred embodiments, the temporary buttress 5 is a steel-structured buttress, and the newly-added pier 8 is a steel pier.
Compare in the concrete material, adopt the steel material, on the one hand lighter, the hoist and mount of not only being convenient for satisfies the heavy requirement that subtracts for the soft soil foundation moreover, and on the other hand can be at the prefabricated shaping of mill, and need not cast-in-place, can shorten construction cycle.
In some preferred embodiments, the newly-added main beam 11 is a simple supported beam, so that the influence of the newly-built abutment 10 on the main beam 6 can be avoided.
In some preferred embodiments, the reinforcing pile 4 is a high-pressure jet grouting pile, a powder spraying pile or a precast pile, preferably a high-pressure jet grouting pile.
In some preferred embodiments, the diameter of the reinforcing piles 4 is 0.4m to 1m, and preferably, the diameter of the reinforcing piles 4 is 0.6 m.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A reinforcing construction method for a soft foundation lower abutment is characterized by comprising the following steps:
filling soil (1) after the abutment of the abutment (2) is removed;
along the longitudinal direction of the bridge, in the range of the soft soil foundation, driving reinforcing piles (4) for reinforcing the soft soil foundation into the two sides of the abutment (2);
arranging a temporary buttress (5) on a bearing platform (20) of the bridge abutment (2), and jacking up a main beam (6) through the temporary buttress (5) until the main beam (6) is separated from a body (21) and a rib plate (22) of the bridge abutment (2);
dismantling a body (21) and a rib plate (22) of the bridge abutment (2);
a newly-added pier (8) and a newly-added support (9) are sequentially installed on the bearing platform (20) from bottom to top;
the temporary buttress (5) is dismantled, so that the main beam (6) descends and is loaded on the newly added support (9);
along the longitudinal direction of the bridge, the soft soil foundation is close to one end of the roadbed, a newly-built abutment (10) is constructed, and a newly-added main beam (11) is installed between the newly-built abutment (10) and the newly-added support (9).
2. The soft foundation lower abutment reinforcement construction method according to claim 1, characterized in that:
before the main girder (6) is jacked up by the temporary buttress (5), the method further comprises: driving a newly added pile foundation (3) into at least one side of the abutment (2) along the longitudinal bridge direction;
before installing newly-increased pier (8) and newly-increased support (9) on the cushion cap (20) from bottom to top in proper order, the method still includes: along the longitudinal bridge direction, at least one side of the bearing platform (20) is provided with a newly-added bearing platform (7), the newly-added bearing platform (7) is positioned on the newly-added pile foundation (3), and the newly-added bearing platform (7) is connected with the bearing platform (20) to form an enlarged bearing platform.
3. The soft foundation lower abutment reinforcement construction method according to claim 2, characterized in that: and the newly-added bearing platform (7) adopts a steel bearing platform.
4. The soft foundation lower abutment reinforcement construction method according to claim 1, characterized in that: the method further comprises the following steps: and (5) filling soil (12) after the new abutment is replaced by constructing the newly-built abutment (10).
5. The soft foundation lower abutment reinforcement construction method according to claim 4, characterized in that: and the filling (12) after the new platform is replaced adopts lightweight concrete.
6. The soft foundation lower abutment reinforcement construction method according to claim 1, characterized in that: newly-built abutment (10) are including inserting and beating in the newly-built pile foundation (100) of soft soil foundation to and newly-built cushion cap (101), newly-built platform body (102) and newly-built floor (103) that set gradually from bottom to top.
7. The soft foundation lower abutment reinforcement construction method according to claim 1, characterized in that: the temporary buttress (5) adopts a steel structure buttress, and/or the newly-added pier (8) adopts a steel pier.
8. The soft foundation lower abutment reinforcement construction method according to claim 1, characterized in that: the newly-added main beam (11) adopts a simply-supported beam.
9. The soft foundation lower abutment reinforcement construction method according to claim 1, characterized in that: the reinforcing pile (4) adopts a high-pressure jet grouting pile, a powder jet grouting pile or a precast pile.
10. The soft foundation lower abutment reinforcement construction method according to claim 1, characterized in that: the diameter of the reinforcing pile (4) is 0.4-1 m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010453996.7A CN111622090B (en) | 2020-05-26 | 2020-05-26 | Soft foundation lower abutment reinforcing construction method |
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| CN202010453996.7A CN111622090B (en) | 2020-05-26 | 2020-05-26 | Soft foundation lower abutment reinforcing construction method |
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| CN111622090A true CN111622090A (en) | 2020-09-04 |
| CN111622090B CN111622090B (en) | 2021-10-26 |
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| CN200943182Y (en) * | 2006-08-28 | 2007-09-05 | 陈旭东 | Bridge structure |
| JP2015055084A (en) * | 2013-09-11 | 2015-03-23 | 公益財団法人鉄道総合技術研究所 | Earthquake strengthening method for bridge for preventing bridge fall |
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| KR20180019322A (en) * | 2016-08-16 | 2018-02-26 | 한국토지주택공사 | Integral bridge structure and construction method thereof |
| CN108457204A (en) * | 2018-02-10 | 2018-08-28 | 北京工业大学 | One kind carrying out bracing means for old Bridge Foundation Lack of support |
| CN108999097A (en) * | 2018-09-04 | 2018-12-14 | 杭州市交通规划设计研究院 | The reconstruction structure and construction method of existing abutment in a kind of bridge jacking |
| CN210561779U (en) * | 2019-06-26 | 2020-05-19 | 中铁八局集团第二工程有限公司 | Transformation structure of existing abutment |
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2020
- 2020-05-26 CN CN202010453996.7A patent/CN111622090B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200943182Y (en) * | 2006-08-28 | 2007-09-05 | 陈旭东 | Bridge structure |
| JP2015055084A (en) * | 2013-09-11 | 2015-03-23 | 公益財団法人鉄道総合技術研究所 | Earthquake strengthening method for bridge for preventing bridge fall |
| KR20180019322A (en) * | 2016-08-16 | 2018-02-26 | 한국토지주택공사 | Integral bridge structure and construction method thereof |
| CN107142856A (en) * | 2017-06-26 | 2017-09-08 | 中铁第四勘察设计院集团有限公司 | Bridge pier and the bridge of lifting reconstruction that abutment remodeling method, abutment, abutment are transformed |
| CN108457204A (en) * | 2018-02-10 | 2018-08-28 | 北京工业大学 | One kind carrying out bracing means for old Bridge Foundation Lack of support |
| CN108999097A (en) * | 2018-09-04 | 2018-12-14 | 杭州市交通规划设计研究院 | The reconstruction structure and construction method of existing abutment in a kind of bridge jacking |
| CN210561779U (en) * | 2019-06-26 | 2020-05-19 | 中铁八局集团第二工程有限公司 | Transformation structure of existing abutment |
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