CN110777569A - Expansive soil limited deformation anti-upwarp foundation structure and construction method of foundation structure - Google Patents
Expansive soil limited deformation anti-upwarp foundation structure and construction method of foundation structure Download PDFInfo
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- CN110777569A CN110777569A CN201910952750.1A CN201910952750A CN110777569A CN 110777569 A CN110777569 A CN 110777569A CN 201910952750 A CN201910952750 A CN 201910952750A CN 110777569 A CN110777569 A CN 110777569A
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- reinforcing
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- raft
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- foundation structure
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/008—Drainage of track
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/07—Drainage
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/08—Deep or vertical foundation
Abstract
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.
Description
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 pile 10; a flexible cushion layer 20; a raft plate 30; a reinforcing structure 40; a side form 50; a roadbed structure 100; a ramp 110; a running water slope 120; a ground line 130.
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 flexible cushion layer 20, a raft 30 and reinforcing piles 10 extending into foundation soil with the expansive soil, wherein the flexible cushion layer 20 is arranged on the top surface of the foundation soil, the raft 30 is positioned above the flexible cushion layer 20, and the raft 30 is simultaneously connected with the flexible cushion layer 20 and the reinforcing piles 10.
As shown in fig. 1, a plurality of reinforcing piles 10 are arranged in the form of pile groups of squares or regular triangles, without limitation. The reinforcing pile 10 is used for reinforcing foundation soil, so that the strength of the foundation soil is ensured, and the effect of controlling the settlement of the roadbed structure 100 is improved. The tops of the reinforcing piles 10 are exposed on the top surface of the foundation soil, the raft 30 is a rigid structure, the roadbed structure 100 is located on the raft 30, and the raft 30 is used for bearing the load from the roadbed structure 100 and transmitting the load to the reinforcing piles 10. When the swelling soil in the foundation soil absorbs water and deforms, the deformed foundation soil can press the flexible cushion layer 20 to deform, and the deformation of the flexible cushion layer 20 can effectively offset the deformation of the foundation soil, so that the damage of upwarp of the roadbed structure 100 is effectively avoided.
In addition to being able to counteract the deformation caused by a certain arching effect, the compliant cushion 20 is also able to produce a small amount of deformation due to its own weight to accommodate the structure of the raft 30 etc. located above it.
Preferably, the compliant pad 20 has a compression modulus of 1 to 3MPa and a thickness of 0.1 to 0.3 m. The material of the flexible cushion layer 20 includes, but is not limited to, loose porous material, or rubber. For example, the compliant pad 20 is a polystyrene foam board, glass wool, styrene butadiene rubber, or the like.
In the embodiment of the invention, the limited deformation refers to the condition that the deformation amount of the roadbed structure 100 caused by the expansion of the expansive soil is less than 0.1 m. Because the high-speed railway has strict requirements on the deformation of the roadbed structure 100, the roadbed structure adopting the embodiment of the invention can meet the requirements of the corresponding roadbed structure 100.
In some embodiments of the invention, the foundation structure further comprises a reinforcing structure 40, the reinforcing structure 40 being inserted at one end into the reinforcing piles 10 and at the other end into the rafts 30.
The reinforcing structure 40 further reinforces the mechanical properties of the foundation structure. Specifically, the reinforcing structure 40 may be inserted into the reinforcing piles 10 and the raft 30 by anchoring, so as to enhance the integrity among the reinforcing piles 10, the raft 30, the flexible cushion 20 and the reinforcing structure 40, and further improve the bending resistance and the compression resistance of the foundation structure.
Further, the end of the reinforcing structure 40 connected to the reinforcing piles 10 is tapered such that the inner diameter thereof gradually decreases from top to bottom, and the end of the reinforcing structure 40 connected to the raft 30 is frustum-shaped such that the inner diameter thereof gradually decreases from top to bottom.
As shown in fig. 1 and 2, the conical bottom of the reinforcing structure 40 is easier to insert into for construction, and the frustum shape with large top and small bottom of the reinforcing structure 40 can be better anchored into the raft 30, so that the connection strength between the raft 30 is increased.
The material of the reinforcing structure 40 is preferably steel, such as steel bar. It is understood that other alloys may be used for the reinforcing structure 40, or materials that may be substituted for steel reinforcement in future technologies. For example: the reinforcing structure 40 may be made of glass fiber, carbon fiber, or the like.
Without limitation, the reinforcing structure 40 is a cage of rebar, i.e., a rebar cage.
Preferably, the length of the reinforcing structure 40 is less than the length of the reinforcing pile 10. As shown in FIG. 1, the reinforcing structure 40 is disposed at the top of the reinforcing pile 10 and has a length of 2-5 m. The reinforcing structure 40 can reduce the use amount of reinforcing steel bar materials on the basis of meeting the mechanical performance of the foundation structure, and has better economic effect.
In some embodiments of the invention, the rafts 30 are of reinforced concrete structure.
Further, the reinforcing bars of the rafts 30 are connected with the reinforcing structures 40, and the reinforcing bars of the rafts 30 are connected with the flexible cushion 20. Specifically, during construction, the reinforcing steel bars of the raft 30 are bound on the flexible cushion layer 20, and meanwhile, the reinforcing steel bars of the raft 30 are also connected with the reinforcing steel bars of the reinforcing structure 40 positioned at the top of the reinforcing pile 10, and then concrete is poured to form the raft 30. The integrality of the reinforcing piles 10, the flexible cushion layer 20, the raft 30 and the reinforcing structure 40 is further improved, and the bending resistance and the compression resistance of the integral structure formed by the reinforcing piles 10, the flexible cushion layer 20, the raft 30 and the reinforcing structure 40 are ensured.
In some embodiments of the present invention, the reinforcing piles 10 are reinforced concrete bored piles.
In other preferred embodiments of the present invention, the reinforcing piles 10 are preferably CFG piles. Compared with the reinforced concrete bored pile, the CFG pile has smaller distance between the piles, the CFG pile is low in cost, the using amount of reinforcing steel bars is reduced, and the cost is further reduced. CFG stake, raft 30 and additional strengthening 40 bear the moment of flexure jointly, and the stake length of CFG stake is 10 ~ 25m generally, and raft 30 thickness is 0.4 ~ 0.6 m.
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 pile 10;
laying a flexible cushion 20 on the top surface of the foundation soil;
arranging a raft 30 on the flexible cushion layer 20, and simultaneously connecting the raft 30 with the flexible cushion layer 20 and the reinforcing piles 10.
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 raft 30 are determined, and the foundation soil is dug for the first time to a position about 0.15m below the designed pile top elevation. And (3) adopting a long spiral drilling machine to form holes, wherein the hole diameter is 0.4-0.6 m, the pile spacing is 1.5-2.0 m, the pile length is generally 10-25 m, the square or regular triangle is arranged, and pouring CFG pile hole concrete.
When the foundation structure further includes the reinforcing structure 40, the reinforcing structure 40 is inserted before the reinforcing piles 10 are solidified, and the top ends of the reinforcing structure 40 are exposed outside the reinforcing piles 10.
In particular, the reinforcing structure 40 is a reinforcement cage. Insert the steel reinforcement cage in CFG pile top according to back dowel bar mode before the concrete initial set and fix, the steel reinforcement cage height is 2 ~ 5m, and the totality is cylindricly. After inserting the steel reinforcement cage, adopt the vibrator to vibrate the loose concrete of CFG pile head portion closely knit to clear away and level the pile head with exceeding the concrete of CFG pile top elevation, maintenance concrete is as an organic whole with the consolidation hardening of reinforcement pile 10 to the steel reinforcement cage, then lays above-mentioned flexible bed course 20.
The process of laying the compliant backing layer 20 is generally: and excavating part of foundation soil again, specifically, cleaning and transporting temporary field mound brought out during pore-forming of the CFG pile, and cleaning and excavating the top surface of the foundation soil between the piles to a certain depth (about 0.2-0.4 m) below the top of the CFG pile. Then, a flexible cushion layer 20 is laid on the top surface of the foundation soil, the thickness of the flexible cushion layer 20 is 0.1-0.3 m, and the compression modulus is 1-3 MPa.
When the rafts 30 are of reinforced concrete structure, the construction method further comprises:
binding reinforcing steel bars of the raft plate 30 on the flexible cushion layer 20, and connecting the reinforcing steel bars of the raft plate 30 with the reinforcing structure 40 exposed outside;
and pouring concrete of the raft plates 30 until the reinforcing structures 40 exposed outside are positioned in the concrete.
Further, the reinforcing steel bars of the raft 30 are bound on the bottom die of the flexible cushion layer 20, the detachable side dies 50 are arranged on the periphery of the bottom die through the supports, concrete is poured on the raft 30, and the thickness of the raft 30 is 0.4-0.6 m. When concrete is cast in place, the top of the CFG pile is about 0.1m and the top of the reinforcing structure 40 is anchored into the raft 30 to form an integral structure, and a certain anti-upwarping effect is formed by utilizing the compressibility of the flexible cushion layer 20 at the bottom of the raft 30.
After the above process is completed, the roadbed structure 100 can be set. Specifically, it includes filling roadbed filling on the raft 30.
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 water slopes 120 on the top surfaces of the foundation bed bottom towards two sides, and preferably selecting the gradient coefficient of the running water slopes 120 to be 4%. And then, filling the bottom layer filler of the foundation bed according to the standard foundation bed surface layer compaction, wherein the shape of the top surface of the roadbed structure 100 is set according to the high-speed railway track type.
As shown in fig. 1, the roadbed structure 100 has a substantially trapezoidal shape, and the slopes 110 of both sides of the roadbed structure 100 preferably have a slope of 1: 15. The ground line 130 is located on the rafts 30.
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.
Claims (10)
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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952750.1A CN110777569A (en) | 2019-10-09 | 2019-10-09 | Expansive soil limited deformation anti-upwarp foundation structure and construction method of foundation structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910952750.1A CN110777569A (en) | 2019-10-09 | 2019-10-09 | Expansive soil limited deformation anti-upwarp foundation structure and construction method of foundation structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111379199A (en) * | 2020-03-30 | 2020-07-07 | 中铁二院工程集团有限责任公司 | Construction device, construction system and construction method for void pile plate structure |
| CN111424481A (en) * | 2020-03-10 | 2020-07-17 | 西南交通大学 | Expansive soil cutting structure and construction method thereof |
| CN113494074A (en) * | 2021-07-30 | 2021-10-12 | 中铁七局集团郑州工程有限公司 | Building foundation treatment method for area with liquefied soil bearing layer |
| CN113789687A (en) * | 2021-08-23 | 2021-12-14 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Pile plate structure |
| CN114164851A (en) * | 2021-11-19 | 2022-03-11 | 新疆交通建设集团股份有限公司 | CFG pile foundation construction method for improving bearing capacity of foundation |
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2019
- 2019-10-09 CN CN201910952750.1A patent/CN110777569A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424481A (en) * | 2020-03-10 | 2020-07-17 | 西南交通大学 | Expansive soil cutting structure and construction method thereof |
| CN111379199A (en) * | 2020-03-30 | 2020-07-07 | 中铁二院工程集团有限责任公司 | Construction device, construction system and construction method for void pile plate structure |
| CN111379199B (en) * | 2020-03-30 | 2021-08-03 | 中铁二院工程集团有限责任公司 | Construction device, construction system and construction method for void pile plate structure |
| CN113494074A (en) * | 2021-07-30 | 2021-10-12 | 中铁七局集团郑州工程有限公司 | Building foundation treatment method for area with liquefied soil bearing layer |
| CN113494074B (en) * | 2021-07-30 | 2022-09-13 | 中铁七局集团郑州工程有限公司 | Building foundation treatment method for area with liquefied soil bearing stratum |
| CN113789687A (en) * | 2021-08-23 | 2021-12-14 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Pile plate structure |
| CN113789687B (en) * | 2021-08-23 | 2023-10-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Pile plate structure |
| CN114164851A (en) * | 2021-11-19 | 2022-03-11 | 新疆交通建设集团股份有限公司 | CFG pile foundation construction method for improving bearing capacity of foundation |
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