CN203559427U

CN203559427U - Settlement-adjustable piled raft foundation structure under combined action of pile and soil

Info

Publication number: CN203559427U
Application number: CN201320673436.8U
Authority: CN
Inventors: 张健; 孙学锋; 冀科锋
Original assignee: Zhong Jian Architecture Design Institute Jinan Co Ltd
Current assignee: Zhong Jian Architecture Design Institute Jinan Co Ltd; CSCEC Jinan Architectural Design Institute Co Ltd
Priority date: 2013-10-30
Filing date: 2013-10-30
Publication date: 2014-04-23
Anticipated expiration: 2023-10-30

Abstract

The utility model discloses a settlement-adjustable piled raft foundation structure under the combined action of a pile and soil. The structure comprises a pile foundation, a raft plate and a pile cap, wherein the pile cap is arranged between the pile foundation and the raft plate, consists of an inner cylinder cavity formed by arranging annular stirrups, side protective nets and a pile cap cover plate, and is used for adjusting differential settlement of the pile foundation and the raft plate; and the height of the cavity is greater than the maximum settlement value of a superstructure. The structure has the benefits that the structure can sufficiently exert a bearing potential of foundation soil, can reduce the pile number, is easy and simple to operate and high in reliability, and has a better popularization prospect.

Description

A kind of pile soil common action sedimentation adjustable type pile-raft foundation structure

Technical field

The utility model relates to a kind of optimal design of pile-raft foundation, particularly, relates to a kind of pile soil common action sedimentation adjustable type pile-raft foundation structure.

Technical background

Along with the high speed development of economic construction, infrastructure is more and more, and pile foundation is because the reliability aspect settlement Control and bearing capacity is subject to increasing attention, and pile foundation theory has also had significant progress and development.Generally, there is the difference of the order of magnitude in the support stiffness of stake, soil, and therefore, under identical load level, the distortion of stake soil is also inharmonious, and both are difficult to as an overall work.Also just for these reasons, ordinary pile foundation designs by all transferring to pile foundation to bear superstructure load at present, do like this and not only easily make raft plate of building and foundation soil come to nothing, cause certain hidden danger to durability and the safety of building foundation, more seriously the bearing capacity of foundation soil cannot be brought into play, and causes larger waste.Bearing capacity of foundation soil is higher, wastes larger.Therefore consider how to utilize the supporting capacity of foundation soil self, the acting in conjunction that realizes stake soil is a problem in the urgent need to address.

Pile soil common action problem is one of key problem of theory of pile foundation research, the essence of its problem is exactly the bearing capacity that how to make full use of stake and foundation soil, make two kinds of diverse materials of mechanical property can bear superstructure load, and Deformation control within the range of permission simultaneously.For eliminating the modified difference of stake soil, guarantee pile soil common action, from realizing the prerequisite of pile soil common action, the implementation method of the pile soil common action that current engineering circles is occurred is roughly divided into three major types, is specially: compensate for displacement method, rigidity are adjusted method and adds in advance displacement method.Above method major part has also rested on theoretical side at present, the drawback that has design calculation theory imperfection, method is immature, construction cost is higher and is difficult to realization.

Summary of the invention

Technical problem to be solved in the utility model is for above-mentioned the deficiencies in the prior art, and provide a kind of pile soil common action sedimentation adjustable type pile-raft foundation to construct, the utility model can fully play potential bearing capacity, a minimizing stake number, cost-saving for foundation soil, it is a kind of both economical applicable new structure structure, easy and simple to handle, reliability is strong, has stronger promotion prospect.

For achieving the above object, the utility model is by the following technical solutions: a kind of pile soil common action sedimentation adjustable type pile-raft foundation structure, comprise pile foundation, raft plate, pile cover, described pile cover is arranged between pile foundation and raft plate, by forming by the inner core cavity that ring-shaped stirrup, side shield net and pile cover cover plate form is set, be used for regulating the differential settlement of pile foundation and raft plate, cavity height is greater than the greatest measure that superstructure is sunk.

Further, in described inner core cavity, be provided with vertical reinforcement, between its top and pile cover cover plate, there is certain space, its bottom is connected with pile foundation, its Main Function is after second pouring, pile foundation and raft plate to be reconnected in aggregates, after assurance stiffness tuning, the resistance to plucking ability of pile foundation is not less than ordinary pile foundation, and owing to having certain space between its top and pile cover cover plate, the situation of bending reinforcing bar in the time of therefore effectively preventing the sedimentation of raft plate.

Further, described inner core cavity bottom and pile foundation junction are provided with sealing ring, and it can effectively prevent that soil from advancing into cavity inside in slip casting.

Further, Grouting Pipe and anti-slurry pipe are installed on described pile cover cover plate, and anti-slurry in pipe is provided with settlement measurement bar, and settlement measurement bar is through anti-slurry pipe, its bottom is connected with pile foundation, it exposes outside anti-slurry pipe, for measuring the relative deformation of pile foundation and raft plate, when the stressed generation sedimentation of raft plate, stake is now not stressed, measuring stick stretches out the corresponding increase of raft plate length, and available meter ruler is measured the length of increase, records raft plate settling amount.

Further, raft plate top is extended in described Grouting Pipe and anti-one end, top of starching pipe, the other end of Grouting Pipe is positioned at the bottom of pile cover inner chamber, and the counter other end of starching pipe is concordant with the bottom surface of pile cover cover plate, anti-main exhaust passage when starching pipe and being secondary pressure cement injection slurry.

As preferably, the external margin of the junction of pile cover and raft plate and pile cover, raft plate is provided with pile cover arrangement of reinforcement, for strengthening the fastening degree of pile cover and raft plate.

Described a kind of pile soil common action sedimentation adjustable type pile-raft foundation structure and construction technology, generally be suitable for better area of soil property, as low compression soil such as sands, the settling amount that different soil properties completed in construction period has very large difference, generally for sand, can think that construction period its final settlement has completed more than 80%, for other low compressibility soil, can think and complete the 50%-80% of final settlement, for middle compressibilty soil, can think and complete 20%-50%, for high-compressibility soil, can think and complete 5%-20%, during design, need to estimate the foundation deformation value of building within the scope of design load, so that the height of reserved pile cover cavity, when foundation soil is born part superstructure load, with stake, bear total settlement and the relative settlement of residue load and control building.In this applicable novel specific design process, should note the value of bearing capacity of foundation slab,

The reasonable value of bearing capacity of foundation slab is the importance can rigidity mode pile-raft foundation successfully designing, also determined to a great extent the cost on whole basis, when the foundation soil destruction of loses stability not, and s is also just within permissible range [S] time in distortion, the design of ground is most economical, in order to make full use of the bearing capacity of foundation soil, when carrying out the calculating of bearing capacity of foundation slab, just can not be confined to all the time elastic stage.Concrete bearing capacity of foundation slab get surely should according to test in situ and with due regard to the dimensional effect of raft plate determine, that is also should control the bearing capacity of determining foundation soil by allowable strain.

The beneficial effects of the utility model are: can fully play foundation soil potential bearing capacity, reduce a stake number, easy and simple to handle, reliability is strong, has stronger promotion prospect.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the utility model is described further

Fig. 1 is the structural profile schematic diagram of pile cover of the present invention.

Fig. 2 is the structural reinforcement intention of pile cover of the present invention.

Fig. 3 is the structural plan schematic diagram of pile cover of the present invention.

Fig. 4 is the floor map of pile cover cover plate.

In figure: 1, pile cover, 2, vertical reinforcement, 3, side shield net, 4, steel hoop, 5, settlement measurement bar, 6, Grouting Pipe, 7, raft plate, 8, anti-slurry pipe, 9, pile cover cover plate, 10, pile cover arrangement of reinforcement, 11, sealing ring.

The specific embodiment

A kind of pile soil common action sedimentation adjustable type pile-raft foundation structure, it is to implement like this, 12 pile foundation constructions are complete, and through acceptance(check), the pile crown of 12 pile foundations cleared up and chipping, at 12 pile foundation tops, 11 sealing rings are set around, then at 11 sealing ring edges, 4 steel hoops are set, then 3 side shield nets are fixed on 4 steel hoops, on 12 pile foundation top pile crowns, 2 vertical reinforcements are set, the height of 2 vertical reinforcements is lower than the inner core cavity height that is intended to arrange, then 5 settlement measurement bars are vertically fixed in 12 pile foundations, 5 settlement measurement bars stretch out outside 7 raft plates, at the external margin of inner core cavity, the external margin of pile cover arranges 10 pile cover arrangements of reinforcement, 6 Grouting Pipe and 8 anti-slurry pipes are installed on 9 pile cover cover plates, one end, bottom of 8 anti-slurry pipes is concordant with 9 pile cover cover plate bottom surfaces, 7 raft plates are extended in one end, top, 7 raft plates are stretched out in one end of 6 Grouting Pipe, the other end extends to the bottom of inner core cavity, then 9 pile cover cover plates are covered on 4 steel hoops, now because 8 anti-slurry pipes are identical with the position of 5 settlement measurement bars, 5 settlement measurement bars expose outside 7 raft plates through 8 anti-slurry pipes, now 1 pile cover construction is complete, cast pile cover concrete, at the external margin of raft plate and with the junction of pile cover, 10 pile cover arrangements of reinforcement are set, then pour into a mould raft board concrete, when foundation deformation reaches after limiting design value, by 6 Grouting Pipe, to the cement slurry that pours into a high strength grade in pile cover, 2 vertical reinforcements of 12 pile foundations are connected in aggregates with 7 raft plates.

Obviously, above-mentioned embodiment is only better embodiment of the present utility model, and the simple modifications of then carrying out on this basis, all belongs to protection domain of the present utility model.

Claims

1. a pile soil common action sedimentation adjustable type pile-raft foundation is constructed, comprise pile foundation, raft plate, pile cover, it is characterized in that pile cover is arranged between pile foundation and raft plate, the inner core cavity being formed by ring-shaped stirrup, side shield net and pile cover cover plate forms, be used for regulating the differential settlement of pile foundation and raft plate, cavity height is greater than the greatest measure that superstructure is sunk.

2. a kind of pile soil common action sedimentation adjustable type pile-raft foundation according to claim 1 is constructed, it is characterized in that on pile cover cover plate, Grouting Pipe being installed manages with anti-slurry, in anti-slurry pipe, be provided with settlement measurement bar, settlement measurement bar bottom is connected with pile foundation, and it exposes outside anti-slurry pipe.

3. a kind of pile soil common action sedimentation adjustable type pile-raft foundation according to claim 1 is constructed, it is characterized in that being provided with vertical reinforcement in inner core cavity, between its top and pile cover cover plate, have certain space, its bottom is connected with pile foundation, and inner core cavity bottom and pile foundation junction are provided with sealing ring.