CN211113579U - Heavy-load ground foundation structure for seepage-proofing area of soft foundation - Google Patents
Heavy-load ground foundation structure for seepage-proofing area of soft foundation Download PDFInfo
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- CN211113579U CN211113579U CN201921374727.0U CN201921374727U CN211113579U CN 211113579 U CN211113579 U CN 211113579U CN 201921374727 U CN201921374727 U CN 201921374727U CN 211113579 U CN211113579 U CN 211113579U
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Abstract
The utility model provides a regional heavy load ground foundation structure of weak ground seepage prevention, including composite foundation, plain soil layer, grit mattress pad layer, sodium-based bentonite pad, prevent the osmosis membrane, geotechnique's compound drainage network, plain concrete bed course and reinforced concrete layer, composite foundation includes vertical reinforcement and horizontal reinforcement, vertical reinforcement is prestressing force thin wall tubular pile, horizontal reinforcement is two-layer one-way polyester fiber grid tied in a bundle, horizontal reinforcement sets up the top surface at vertical reinforcement, plain soil layer sets up on vertical reinforcement top and in horizontal reinforcement bottom surface, the top surface of horizontal reinforcement has set gradually grit mattress layer, sodium-based bentonite pad, prevent the osmosis membrane, geotechnique's compound drainage network, plain concrete bed course and reinforced concrete layer. The utility model discloses can strengthen ground structural strength and bearing capacity, reduce ground deformation and creep, reduce pile foundation investment cost.
Description
Technical Field
The utility model belongs to the technical field of the industry civil engineering structure, especially, relate to a regional heavy load ground foundation structure of soft foundation prevention of seepage.
Background
With the increasing standardization and strictness of the national environmental protection requirements on engineering projects, the anti-seepage treatment of heavy-load floors of buildings has become an important component of industrial building design. The main mode of current anti-seepage treatment is to lay an anti-seepage film, and the anti-seepage film has strict requirements on the settlement of the foundation, i.e. large settlement and settlement difference are not allowed to occur. In addition, foundation treatment is carried out in the seepage-proofing area of the soft foundation, so that the requirements of ground load and seepage-proofing on differential settlement of the foundation can be met. However, the foundation is usually reinforced by using common prestressed pipe piles, cement mixing piles, gravel piles and other methods, and the treatment method still has the defects of insufficient structural strength and bearing capacity of the foundation, weak foundation deformation and creep control capability, large pile foundation investment and the like.
SUMMERY OF THE UTILITY MODEL
To the above prior art, the to-be-solved technical problem of the utility model lies in providing a can strengthen ground structural strength and bearing capacity, reduce ground deformation and creep, reduce pile foundation investment cost's regional heavy load ground foundation structure of weak ground prevention of seepage.
For solving the technical problem, the utility model provides a regional heavy load ground foundation structure of weak ground seepage prevention, including composite foundation, plain soil layer, grit mattress pad layer, sodium-based bentonite pad, prevention of seepage membrane, geotechnological composite drainage net, plain concrete bed course and reinforced concrete layer, composite foundation includes vertical reinforcement and horizontal reinforcement, vertical reinforcement is prestressing force thin wall tubular pile, horizontal reinforcement is two-layer one-way polyester fiber grid tied in a bundle, horizontal reinforcement sets up the top surface of vertical reinforcement, plain soil layer sets up vertical reinforcement top is just in horizontal reinforcement bottom surface, the top surface of horizontal grit mattress has set gradually mattress layer, sodium-based bentonite pad, prevention of seepage membrane, geotechnological composite drainage net, plain bed course concrete layer and reinforced concrete layer.
Furthermore, the wall thickness of the prestressed thin-wall tubular pile is 60-65 mm, the pile spacing is 1.5-2.5 m, and spiral reinforcements and prestressed reinforcements are arranged in the prestressed thin-wall tubular pile.
Further, the gravel proportion of the gravel cushion layer is 7:3, the maximum particle size is not more than 20mm, and the tamping coefficient is not less than 0.94.
Further, the plain concrete cushion layer has a model number of C15.
Compared with the prior art, the beneficial effects of the utility model are that:
1. by adopting the prestressed thin-wall tubular pile as the vertical reinforcement of the foundation, the unit bearing capacity of the prestressed thin-wall tubular pile can be 2-3 times higher than that of a gravel pile or a cement stirring pile, the production period can be saved by 50% compared with that of the gravel pile, and the engineering cost can be saved by more than 25% compared with that of a common prestressed tubular pile, so that the pile arrangement quantity can be reduced on the premise of ensuring that the ground load requirement is met, the pile foundation cost is reduced, the pile arrangement construction period is shortened, and the construction quality is improved.
2. The two layers of unidirectional polyester fiber cluster grids are laid on the top surface of the prestressed thin-wall pipe pile to serve as a transverse reinforcement of the foundation, and the unidirectional polyester fiber cluster grids have the characteristics of high strength, high bearing capacity, high friction coefficient, large tensile capacity and tensile strength range, small creep and the like compared with polypropylene grids or polyethylene grids, so that the bearing capacity of the foundation can be enhanced, the lateral displacement and deformation of the foundation are restrained, the stability of the foundation is enhanced, the pile spacing can be increased on the premise that the requirement of an anti-seepage film on differential settlement is met, the pile distribution quantity is reduced, and the investment cost is reduced.
Drawings
FIG. 1 is a schematic view of a heavy-load ground foundation structure of an impermeable area of a soft foundation of the present invention;
FIG. 2 is a schematic structural view of the prestressed thin-wall pipe pile in FIG. 1;
illustration of the drawings: the method comprises the following steps of 1-prestressed thin-wall pipe pile, 101-spiral ribs, 102-prestressed reinforcements, 2-head plate, 3-two layers of unidirectional polyester fiber bundling grids, 4-sandstone mattress layer, 5-plain concrete mattress layer and 6-reinforced concrete layer.
Detailed Description
The invention will be further described with reference to the drawings and preferred embodiments.
The utility model relates to a regional heavy load ground foundation structure's of weak ground seepage prevention schematic diagram as shown in fig. 1 and fig. 2, including compound ground, plain soil layer, grit mattress layer 4, sodium-based bentonite pad, HDPE prevention of seepage membrane, geotechnological composite drainage network, plain concrete bed course 5 and reinforced concrete layer 6.
The composite foundation comprises a vertical reinforcement and a transverse reinforcement. The vertical reinforcement body is a prestressed thin-wall tubular pile 1 with spiral ribs 101 and prestressed reinforcement bars 102 supported inside, the wall thickness of the prestressed thin-wall tubular pile 1 is 60-65 mm, the outer diameter is 400mm, the pile spacing is 1.5-2.5 m, a head sealing plate 2 is arranged at the top end of the prestressed thin-wall tubular pile 1, and the head sealing plate 2 is a round thin steel plate with the thickness of 5 mm. A plain soil layer (not marked in the figure) is laid on the top end of the prestressed thin-wall pipe pile 1, and a transverse reinforcement body is laid on the top surfaces of the prestressed thin-wall pipe pile 1 and the plain soil layer, wherein the transverse reinforcement body is two layers of unidirectional polyester fiber bundling grids 3. The top surfaces of the two layers of unidirectional polyester fiber bundling grids 3 are paved with sand-gravel cushion layers 4 with the thickness of 300mm, the sand-gravel proportion of the sand-gravel cushion layers 4 is 7:3, the maximum grain diameter is not more than 20mm, and the tamping coefficient is not less than 0.94. The top surface of the sandstone mattress layer 4 is also sequentially paved with a sodium bentonite pad, an HDPE impermeable membrane and a geotechnical composite drainage net (not shown in the figure). And a plain concrete cushion layer 5 with the thickness of 100mm is laid on the top surface of the geotechnical composite drainage network, and the model of the plain concrete cushion layer 5 is C15. And a reinforced concrete layer 6 with the thickness of 200mm is laid on the top surface of the plain concrete cushion layer 5.
The heavy-load ground foundation structure of the seepage-proofing area of the soft foundation can be realized by the following processing method:
1) before the construction of the prestressed thin-wall pipe pile 1, sundries such as old foundations and broken stones and concrete blocks in filling soil in a construction site are removed;
2) filling plain soil with the thickness of not less than 2m in the cleaned construction site, and tamping in layers, wherein the thickness of tamping in layers is not more than 350mm, and the compaction coefficient is not less than 0.94;
3) after the pipe pile construction machine is in place, the deviation of the pile sinking verticality is not more than 0.5 percent;
4) according to the work investigation report, penetration control is mainly used, pile end elevation is used as assistance, and the prestressed thin-wall pipe pile 1 is sunk in a hammering pile sinking mode, so that the depth of the pile end entering a bearing stratum during pile sinking meets the design requirement and is executed according to the technical specification of building foundation treatment (JGJ 79-2012) and the technical standard of prestressed concrete pipe piles (JGJ/T406-2017);
5) laying two layers of unidirectional polyester fiber bundling grids 3 on the top surface of the prestressed thin-wall pipe pile 1, wherein the two layers of unidirectional polyester fiber bundling grids 3 are arranged in a longitudinally and transversely staggered manner, and the width of the two layers of unidirectional polyester fiber bundling grids 3 is ensured to be 4-5 m;
6) paving a sand-stone mattress layer 4 on the top surfaces of the two layers of unidirectional polyester fiber bundling grids 3;
7) and a sodium-based bentonite pad, an HDPE impermeable membrane and a geotechnical composite drainage net are sequentially paved on the top surface of the sandstone mattress layer 4.
8) And finally, pouring a plain concrete cushion layer 5 and a reinforced concrete layer 6 according to the requirements of the construction drawing.
Example 1:
the engineering is located at the estuary and is a dangerous solid waste warehouse which needs anti-seepage treatment according to the environmental protection requirement, and the size of the warehouse is 33 × 285-9405 m2The ground surface is piled according to 8t/m2Consider. According to the work investigation report, the distribution of the engineering soil layer is as follows:
according to the above work report, the diameter of the prestressed thin-wall tubular pile 1 adopted in the project is 400mm, the wall thickness is 60mm, the pile spacing is 1.8m, the pile length is 12m, and other foundation structure setting and foundation treatment methods are as described above. The construction adopts the prestressed thin-wall pipe pile as a vertical reinforcement in the composite foundation, so that the requirement of ground load can be met; meanwhile, two layers of unidirectional polyester fiber cluster grids are laid on the top surface of the prestressed thin-wall pipe pile to serve as transverse reinforcements in the composite foundation, so that the bearing capacity of the foundation can be further enhanced, the lateral displacement and deformation of the foundation are restrained, and the requirement of an impermeable membrane on differential settlement is met.
Example 2:
the size of the warehouse is 30 × 60-180 m2Ground stacking load of 12t/m2Consider. The proposed site is flat and wide, the elevation change of the ground of the site is 3.70-4.61 m, and the elevation change of the ground of the hole opening is 3.75-4.51 m. According to design requirements, the leveling elevation of the outdoor design of the proposed site is 5.15-5.30 m, so that most of the sections of the proposed site need to be filled with about 0.70-1.80 m. The foundation soil layer of the proposed site mainly comprises silting and alluvial origin and granite weathered rock layer except the surface layer of artificial sand filling, and the foundation parent rock of the site is granite formed in later stage of Yanshan mountain, and the original landform belongs to a coastal terrace landform unit. According to the work investigation report, the concrete distribution conditions of the engineering soil layers are as follows:
according to the above work report, the diameter of the prestressed thin-wall tubular pile 1 adopted in the project is 400mm, the wall thickness is 60mm, the pile spacing is 1.8m, the pile length is 20m, and other foundation structure setting and foundation treatment methods are as described above. The construction adopts the prestressed thin-wall pipe pile as a vertical reinforcement in the composite foundation, so that the requirement of ground load can be met; meanwhile, two layers of unidirectional polyester fiber cluster grids are laid on the top surface of the prestressed thin-wall pipe pile to serve as transverse reinforcements in the composite foundation, so that the bearing capacity of the foundation can be further enhanced, the lateral displacement and deformation of the foundation are restrained, and the requirement of an impermeable membrane on differential settlement is met.
The foregoing merely illustrates preferred embodiments of the present invention, which are described in considerable detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, modifications and substitutions can be made, which are all within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (4)
1. The utility model provides a regional heavy load ground foundation structure of weak ground seepage prevention which characterized in that: including composite foundation, plain soil layer, grit mattress layer, sodium-based bentonite pad, prevention of seepage membrane, geotechnological composite drainage network, plain concrete bed course and reinforced concrete layer, composite foundation includes vertical reinforcement and horizontal reinforcement, vertical reinforcement is prestressing force thin wall tubular pile, horizontal reinforcement is two-layer one-way polyester fiber grid tied in a bundle, horizontal reinforcement sets up the top surface of vertical reinforcement, plain soil layer sets up vertical reinforcement top is just in horizontal reinforcement bottom surface, the top surface of horizontal reinforcement has set gradually grit mattress layer, sodium-based bentonite pad, prevention of seepage membrane, geotechnological composite drainage network, plain concrete bed course and reinforced concrete layer.
2. The heavy-duty ground foundation structure of the impermeable area of the soft foundation as claimed in claim 1, wherein: the wall thickness of the prestressed thin-wall pipe pile is 60-65 mm, the pile spacing is 1.5-2.5 m, and spiral reinforcements and prestressed reinforcements are arranged in the prestressed thin-wall pipe pile.
3. The heavy-duty ground foundation structure of the impermeable area of the soft foundation as claimed in claim 1, wherein: the sandstone proportion of the sandstone mattress layer is 7:3, the maximum grain diameter is not more than 20mm, and the tamping coefficient is not less than 0.94.
4. The heavy-duty ground foundation structure of the impermeable area of the soft foundation as claimed in claim 1, wherein: the model of the plain concrete cushion layer is C15.
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| CN201921374727.0U CN211113579U (en) | 2019-08-23 | 2019-08-23 | Heavy-load ground foundation structure for seepage-proofing area of soft foundation |
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| CN201921374727.0U CN211113579U (en) | 2019-08-23 | 2019-08-23 | Heavy-load ground foundation structure for seepage-proofing area of soft foundation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110593242A (en) * | 2019-08-23 | 2019-12-20 | 中国瑞林工程技术股份有限公司 | Heavy-load ground foundation structure of seepage-proofing area of soft foundation and processing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110593242A (en) * | 2019-08-23 | 2019-12-20 | 中国瑞林工程技术股份有限公司 | Heavy-load ground foundation structure of seepage-proofing area of soft foundation and processing method thereof |
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