Expansive soil limited deformation anti-upwarp foundation structure and construction method of foundation structure
阅读说明:本技术 膨胀土有限变形防上拱的地基结构和地基结构的施工方法 (Expansive soil limited deformation anti-upwarp foundation structure and construction method of foundation structure ) 是由 陈远洪 曾长贤 刘国 廖进星 郭建湖 孟祥龙 袁丛军 骆斌 黄红华 顾成权 李巍 于 2019-10-09 设计创作,主要内容包括:本发明公开了一种膨胀土有限变形防上拱的地基结构和地基结构的施工方法,所述地基结构包括柔性垫层、筏板和伸入地基土内的加固桩,所述柔性垫层设置在地基土的顶面上,所述筏板位于所述柔性垫层上方,且所述筏板同时与所述柔性垫层和所述加固桩连接。本发明实施例的地基结构不仅有效保证了承载和沉降控制效果,还避免了因地基土的膨胀导致路基结构产生上拱病害。(The invention discloses a foundation structure with expansive soil with limited deformation and anti-upwarp and a construction method of the foundation structure. The foundation structure of the embodiment of the invention not only effectively ensures the bearing and settlement control effects, but also avoids the upwarp disease of the roadbed structure caused by the expansion of the foundation soil.)
1. The utility model provides a confined foundation structure that warp is prevented to inflation soil, its characterized in that, foundation structure includes flexible bed course, raft and stretches into and has reinforcement stake in the foundation soil of inflation soil, the flexible bed course sets up on the top surface of foundation soil, the raft is located flexible bed course top, just the raft simultaneously with the flexible bed course with reinforcement stake is connected.
2. A foundation structure according to claim 1, further comprising a reinforcing structure inserted at one end into the reinforcing piles and at the other end into the rafts.
3. The foundation structure of claim 2, wherein the end of the reinforcing structure connected to the reinforcing piles is tapered with an inner diameter gradually decreasing from top to bottom, and the end of the reinforcing structure connected to the rafts is frustum-shaped with an inner diameter gradually decreasing from top to bottom.
4. A foundation structure according to claim 2, wherein the length of the reinforcing structure is less than the length of the reinforcing piles.
5. A foundation structure according to claim 3, wherein the rafts are of reinforced concrete construction; and/or
The reinforcing structure is made of steel.
6. A foundation structure according to claim 5, wherein the tendons of the rafts are connected to the reinforcing structure and the tendons of the rafts are connected to the compliant pad layer.
7. A foundation structure according to claim 1, wherein said reinforcing piles are CFG piles.
8. A method of constructing a foundation structure, the method comprising:
removing the foundation soil until the top surface of the foundation soil is positioned below the pile top of the reinforcing pile;
paving a flexible cushion layer on the top surface of the foundation soil;
arranging a raft on the flexible cushion layer, and simultaneously connecting the raft with the flexible cushion layer and the reinforcing piles.
9. The construction method according to claim 8, further comprising:
and inserting a reinforcing structure before the reinforcing piles are solidified, wherein the top ends of the reinforcing structure are exposed outside the reinforcing piles.
10. The construction method according to claim 9, further comprising:
the raft plates are of reinforced concrete structures;
binding reinforcing steel bars of the raft plate on the flexible cushion layer, and connecting the reinforcing steel bars of the raft plate with the reinforcing structure exposed outside;
and pouring concrete of the raft plates until the reinforcing structures exposed outside are located in the concrete.
Technical Field
The invention relates to the technical field of foundation treatment, in particular to a foundation structure with expansive soil limited deformation and upward arching prevention and a construction method of the foundation structure.
Background
The expansive soil has the characteristics of strong water loss shrinkage and strong water absorption expansion, and if the expansive soil in the foundation soil absorbs water and expands, an upwarp disease is generated on a roadbed structure on the foundation structure, so that the normal operation of a high-speed railway is influenced.
For low embankments and excavation cuts, foundation structures of high speed railways with expansive soils are typically treated by: the foundation bed is filled with qualified fillers, the foundation structure is processed by adopting a CFG (Cement Fly-ash Gravel) pile and pile cap combined with a broken stone cushion layer clamping and paving soil grid structure, the method has good effect of preventing the subgrade from settling, the cost is low, but expansive soil among the CFG piles is easy to expand and deform when meeting water, so that the cushion layer, the filling soil and a roadbed surface generate an upwarp disease under the expansion action, and the upwarp prevention requirement of the subgrade structure under the condition of strong expansion cannot be met. Therefore, although the scheme has a good effect of preventing subgrade settlement, the anti-arching capability is insufficient and the measures are weak.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention provides a foundation structure with expansive soil limited deformation and upward arching prevention and a construction method of the foundation structure.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention discloses a foundation structure with expansive soil limited deformation and upward arching prevention, which comprises a flexible cushion layer, a raft and reinforcing piles, wherein the reinforcing piles extend into foundation soil with the expansive soil, the flexible cushion layer is arranged on the top surface of the foundation soil, the raft is positioned above the flexible cushion layer, and the raft is simultaneously connected with the flexible cushion layer and the reinforcing piles.
In the above scheme, the foundation structure further comprises a reinforcing structure, one end of the reinforcing structure is inserted into the reinforcing piles, and the other end of the reinforcing structure is inserted into the raft.
In the above scheme, the end of the reinforcing structure connected with the reinforcing piles is in a cone shape with the inner diameter gradually decreasing from top to bottom, and the end of the reinforcing structure connected with the raft is in a frustum shape with the inner diameter gradually decreasing from top to bottom.
In the above scheme, the length of the reinforcing structure is smaller than that of the reinforcing pile.
In the above scheme, the raft is of a reinforced concrete structure; and/or
The reinforcing structure is made of steel.
In the above scheme, the reinforcing steel bars of the raft are connected with the reinforcing structure, and the reinforcing steel bars of the raft are connected with the flexible cushion layer.
In the above scheme, the reinforcing piles are CFG piles.
The embodiment of the invention also discloses a construction method of the foundation structure, which comprises the following steps:
removing the foundation soil until the top surface of the foundation soil is positioned below the pile top of the reinforcing pile;
paving a flexible cushion layer on the top surface of the foundation soil;
arranging a raft on the flexible cushion layer, and simultaneously connecting the raft with the flexible cushion layer and the reinforcing piles.
In the above scheme, the construction method further comprises:
and inserting a reinforcing structure before the reinforcing piles are solidified, wherein the top ends of the reinforcing structure are exposed outside the reinforcing piles.
In the above scheme, the construction method further comprises:
the raft plates are of reinforced concrete structures;
binding reinforcing steel bars of the raft plate on the flexible cushion layer, and connecting the reinforcing steel bars of the raft plate with the reinforcing structure exposed outside;
and pouring concrete of the raft plates until the reinforcing structures exposed outside are located in the concrete.
The invention provides a foundation structure with expansive soil limited deformation and upward arching prevention and a construction method of the foundation structure. The roadbed structure is arranged on the raft plates, and the raft plates are used for bearing loads from the roadbed structure and transmitting the loads to the reinforcing piles. The flexible cushion layer between the raft and the top surface of the foundation soil counteracts the expansion of the foundation soil by deforming. In conclusion, the foundation structure of the embodiment of the invention not only effectively ensures the bearing and settlement control effects, but also avoids the upwarp disease of the roadbed structure caused by the expansion of the foundation soil.
Drawings
FIG. 1 is a schematic view of an alternative construction of a foundation structure in an embodiment of the invention;
fig. 2 is an enlarged view of a point a in fig. 1.
Reference numerals:
a reinforcing
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, belong to the scope of protection of the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1.
The embodiment of the invention provides a foundation structure with limited deformation and upwarp prevention of expansive soil, which comprises a
As shown in fig. 1, a plurality of reinforcing
In addition to being able to counteract the deformation caused by a certain arching effect, the
Preferably, the
In the embodiment of the invention, the limited deformation refers to the condition that the deformation amount of the
In some embodiments of the invention, the foundation structure further comprises a reinforcing
The
Further, the end of the
As shown in fig. 1 and 2, the conical bottom of the
The material of the reinforcing
Without limitation, the
Preferably, the length of the reinforcing
In some embodiments of the invention, the
Further, the reinforcing bars of the
In some embodiments of the present invention, the reinforcing
In other preferred embodiments of the present invention, the reinforcing
The embodiment of the invention also provides a construction method of the foundation structure, and the construction method is suitable for any one of the foundation structures. The construction method comprises the following steps:
removing the foundation soil until the top surface of the foundation soil is positioned below the pile top of the reinforcing
laying a
arranging a
Taking the construction of the CFG pile as an example, the construction is measured and set off on site, the positioning and elevation of each point such as the CFG pile and the
When the foundation structure further includes the reinforcing
In particular, the reinforcing
The process of laying the
When the
binding reinforcing steel bars of the
and pouring concrete of the
Further, the reinforcing steel bars of the
After the above process is completed, the
Specifically, the construction of a high-speed railway is taken as an example. And filling the roadbed filling according to the high-speed railway standard. Firstly, filling foundation bed bottom filler according to a foundation bed bottom compaction standard, arranging running
As shown in fig. 1, the
The features disclosed in the several foundation structure construction methods or foundation structure embodiments provided in the present application may be combined arbitrarily without conflict to arrive at new method embodiments or apparatus embodiments.
Other structures and operations of the foundation structure according to the embodiments of the present invention will be understood and readily implemented by those skilled in the art, and thus will not be described in detail.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.