Expansive soil large-deformation anti-upwarp foundation structure and construction method of foundation structure
阅读说明:本技术 膨胀土大变形防上拱的地基结构和地基结构的施工方法 (Expansive soil large-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大变形防上拱的地基结构和地基结构的施工方法,所述地基结构包括加固桩和脱空结构,所述加固桩部分伸入地基土内,所述脱空结构用于承载路基结构;所述脱空结构连接在所述加固桩的顶部,所述脱空结构与所述地基土的顶面之间具有预设深度的容纳空间。通过设置加固桩、脱空结构,并在脱空结构和地基土的顶面之间设置容纳空间,不仅有效保证了承载和沉降控制效果,还有效消除了对路基的上拱风险。(The invention discloses a foundation structure for preventing expansive soil from being deformed greatly and arching and a construction method of the foundation structure, wherein the foundation structure comprises a reinforcing pile and a void structure, the reinforcing pile partially extends into foundation soil, and the void structure is used for bearing a roadbed structure; the void structure is connected at the top of the reinforcing pile, and an accommodating space with a preset depth is formed between the void structure and the top surface of the foundation soil. Through setting up reinforcing pile, void structure to set up accommodation space between the top surface of void structure and foundation soil, not only effectively guaranteed to bear and subside the control effect, still effectively eliminated the risk of encircleing to the road bed.)
1. The foundation structure is characterized by comprising reinforcing piles and a void structure, wherein the reinforcing piles partially extend into foundation soil with the expansive soil, and the void structure is used for bearing a roadbed structure;
the void structure is connected at the top of the reinforcing pile, and an accommodating space with a preset depth is formed between the void structure and the top surface of the foundation soil.
2. A foundation structure according to claim 1, further comprising a support structure connected to the top of the reinforcing piles and connected to the void structure.
3. A foundation structure according to claim 2, wherein said supporting structure comprises a first support and a second support, one end of said first support being inserted into said reinforcing piles and the other end of said first support being inserted into said hollowed structure;
the second supporting piece is arranged on the peripheral side of the first supporting piece and extends out of the reinforcing pile;
the void-free structure is supported on the second support.
4. A foundation structure according to claim 3, wherein the end of the first supporting member connected to the reinforcing piles is tapered such that the inner diameter thereof is gradually reduced from top to bottom, and the end of the first supporting member connected to the void structure is frustum-shaped such that the inner diameter thereof is gradually reduced from top to bottom.
5. A foundation structure according to claim 3, wherein said support structure is steel.
6. A foundation structure according to claim 5, wherein said first support member is a reinforcement cage and said second support member is a steel bar.
7. A foundation structure according to claim 6, wherein the second support is welded to the first support.
8. A foundation structure according to claim 1, wherein said reinforcing piles are CFG piles; and/or
The foundation structure further comprises a water drainage hole and a side ditch, the side ditch is located on one side of the void structure, and the water drainage hole is communicated with the accommodating space and the side ditch so as to guide water in the accommodating space into the side ditch.
9. A foundation structure according to any one of claims 2 to 8, wherein the void structure comprises a bottom form and rafts, the bottom form being provided on the support structure and the rafts being cast on the bottom form.
10. A foundation structure according to claim 9, wherein the rafts are of reinforced concrete construction.
11. A construction method of a roadbed structure is characterized by comprising 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;
and a void structure is arranged at the top of the reinforcing pile, and an accommodating space with a preset depth is formed between the void structure and the top surface of the foundation soil.
12. The construction method according to claim 11, further comprising: and arranging a running water slope on the top surface of the foundation soil.
13. The construction method according to claim 11, further comprising: and firstly, arranging a supporting structure at the top of the reinforcing pile, and then arranging the void structure on the supporting structure.
14. The construction method according to claim 13, further comprising:
inserting one end of a first support member of the support structure into the reinforcing pile before the reinforcing pile is solidified;
and inserting the pile top of the reinforcing pile and the other end of the first support piece into the void structure, and reserving a second support piece extending out of the reinforcing pile on the peripheral side of the first support piece.
15. The construction method according to claim 14, further comprising:
arranging a bottom die of the void structure on the second support;
binding reinforcing steel bars on the bottom die, and pouring concrete to form a raft plate of the void structure; the pile top of the reinforcing pile and the other end of the first supporting piece are inserted into the raft plate.
Technical Field
The invention relates to the technical field of foundation treatment, in particular to a foundation structure for preventing expansive soil from being deformed upwards and a construction method of the foundation structure.
Background
The expansive soil has the characteristics of strong shrinkage after water loss and strong expansion after water absorption, and if the foundation soil expands due to water absorption, a roadbed structure on a foundation structure generates an upwarp disease, 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 combining CFG (Cement Fly-ash Gravel) piles and pile caps with a broken stone cushion layer clamping and paving geogrid structure, the method has good effect of preventing the subgrade structure 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 the subgrade structure are subjected to expansion to generate upwarp diseases, and the upwarp prevention requirement of the subgrade structure under the condition of strong expansion cannot be met. Therefore, although the settlement prevention effect of the roadbed structure is good, the anti-arching capacity 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 large 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 for preventing expansive soil from being deformed upwards, which comprises a reinforcing pile and a void structure, wherein the reinforcing pile partially extends into foundation soil with the expansive soil, and the void structure is used for bearing a roadbed structure;
the void structure is connected at the top of the reinforcing pile, and an accommodating space with a preset depth is formed between the void structure and the top surface of the foundation soil.
In the above scheme, the foundation structure further comprises a support structure, and the support structure is connected to the top of the reinforcing pile and connected to the void structure.
In the above scheme, the support structure includes a first support member and a second support member, one end of the first support member is inserted into the reinforcing pile, and the other end of the first support member is inserted into the void structure;
the second supporting piece is arranged on the peripheral side of the first supporting piece and extends out of the reinforcing pile;
the void-free structure is supported on the second support.
In the above scheme, one end of the first support member connected to the reinforcing pile is in a tapered shape with an inner diameter gradually decreasing from top to bottom, and one end of the first support member connected to the void structure is in a frustum shape with an inner diameter gradually decreasing from top to bottom.
In the above scheme, the support structure is made of steel.
In the above scheme, the first support piece is a steel reinforcement cage, and the second support piece is a steel bar.
In the above scheme, the second supporting member is welded to the first supporting member.
In the above scheme, the reinforcing piles are CFG piles; and/or
The foundation structure further comprises a water drainage hole and a side ditch, the side ditch is located on one side of the void structure, and the water drainage hole is communicated with the accommodating space and the side ditch so as to guide water in the accommodating space into the side ditch.
In the above scheme, the void structure comprises a bottom die and a raft, the bottom die is arranged on the support structure, and the raft is poured on the bottom die.
In the above scheme, the raft is of a reinforced concrete structure.
The embodiment of the invention also provides a construction method of the roadbed 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;
and a void structure is arranged at the top of the reinforcing pile, and an accommodating space with a preset depth is formed between the void structure and the top surface of the foundation soil.
In the above scheme, the construction method further comprises: and arranging a running water slope on the top surface of the foundation soil.
In the above scheme, the construction method further comprises: and firstly, arranging a supporting structure at the top of the reinforcing pile, and then arranging the void structure on the supporting structure.
In the above scheme, the construction method further comprises:
inserting one end of a first support member of the support structure into the reinforcing pile before the reinforcing pile is solidified;
and inserting the pile top of the reinforcing pile and the other end of the first support piece into the void structure, and reserving a second support piece extending out of the reinforcing pile on the peripheral side of the first support piece.
In the above scheme, the construction method further comprises:
arranging a bottom die of the void structure on the second support;
binding reinforcing steel bars on the bottom die, and pouring concrete to form a raft plate of the void structure; the pile top of the reinforcing pile and the other end of the first supporting piece are inserted into the raft plate.
The invention provides a foundation structure for preventing expansive soil from being deformed and arching and a construction method of the foundation structure. An accommodating space provided for foundation soil expansion is arranged between the void structure and the top surface of the foundation soil, and the void structure has the function of resisting the foundation soil expansion and arching. According to the foundation structure provided by the embodiment of the invention, the reinforcing piles and the void structures are arranged, and the accommodating space is arranged between the void structures and the top surfaces of the foundation soil, so that the bearing and settlement control effects are effectively ensured, and the arching risk to the roadbed structure is effectively eliminated.
Drawings
Fig. 1 is a schematic view of a foundation structure and a roadbed structure according to an embodiment of the present invention;
fig. 2 is a partially enlarged view of a portion 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 for preventing expansive soil from being deformed upwards, which comprises a reinforcing
As shown in fig. 1, the foundation soil is reinforced by the reinforcing
The preset depth of the
The "large deformation" in the embodiment of the present invention refers to a case where the amount of upward arching deformation of the
In some embodiments of the present invention, the foundation structure further includes a
Further, the foundation structure further includes a
The
In some embodiments of the present invention, the supporting
The insertion of the
To better ensure the strength and integrity of the foundation structure, the
It is understood that other alloys may be used for the
Without limitation, for example: the first supporting
At least two second supporting members 32 may be uniformly disposed on the peripheral side of each first supporting
Preferably, the second support 32 is welded to the
Without limitation, the end of the
In some embodiments of the invention, the reinforcing piles are reinforced concrete bored piles and the void structures are plate girder structures.
In other preferred embodiments of the present invention, the reinforcing
Further, the
Rafts 22 are preferably of reinforced concrete construction. Specifically, during construction, the reinforcing steel bars of the raft 22 are bound on the
The embodiment of the invention also provides a construction method of the foundation structure, which is used for constructing and forming any one of the foundation structures. The construction method comprises the following steps:
removing the foundation soil until the
a
Taking the construction of the CFG pile as an example, the process of removing the foundation soil to form the reinforcing
When the foundation structure comprises the above-mentioned
Further, the construction method further comprises the following steps: before the reinforcing
Specifically, a steel bar cage (i.e., a first support member 31) is inserted into the top of the CFG pile in a post-reinforcement-inserting manner before the poured CFG pile hole concrete is initially set, wherein the conical bottom of the steel bar cage is inserted into the CFG pile, a steel bar (i.e., a second support member 32) capable of extending out of the CFG pile is welded and reserved at the pile head position of the steel bar cage, and the steel bar is positioned about 0.15m below the pile top elevation, i.e., flush with the excavated ground. And further, vibrating and compacting the loose concrete at the head part of the CFG pile by adopting a vibrating rod, removing the concrete which exceeds the elevation of the CFG pile top and leveling the pile head, and curing the concrete until the short reinforcement cage is solidified and hardened with the pile body into a whole.
Further, when the
Specifically, temporary field mound brought out when the CFG pile is drilled is cleaned and transported outwards, foundation soil between the piles is cleaned and excavated again to a preset depth below the top of the CFG pile, and the preset depth is about 0.3-0.5 m.
Preferably, a running water slope is provided on the
After the bottom die 21 is arranged, erecting raft 22 steel bars and pouring raft 22 concrete. Specifically, steel bars are bound on the bottom die 21, concrete is poured, and a raft 22 of the
The specific operation process comprises the following steps: and (3) binding reinforcing steel bars of the raft 22 on the bottom die 21, arranging detachable side dies 80 on the periphery by adopting supports, and pouring concrete of the raft 22, wherein the thickness of the raft 22 is preferably 0.4-0.6 m. When the concrete is cast in place, the top of the CFG pile is about 0.1m, and the frustum-shaped head steel bars of the first supporting
After the rafts 22 are formed, roadbed filling may be filled, and side ditches 70 and drainage holes 60 are provided, as shown in fig. 1, with a
Specifically, as shown in fig. 1, a
The process of constructing the lateral ditches 70 and the drainage holes 60 includes: the method comprises the steps of vertically excavating foundation pits with side ditches 70 on two sides, binding steel bars of the side ditches 70, arranging a detachable inner mold by using the vertical soil molds on the two sides and adopting a support, pouring concrete of the side ditches 70, arranging a
The features disclosed in the several construction method or foundation structure embodiments provided in the present application may be combined arbitrarily without conflict, resulting in a new construction method embodiment or foundation structure embodiment.
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.
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