CN210002394U

CN210002394U - Be used for reinforced (rfd) outer protecting cylinder of pile foundation

Info

Publication number: CN210002394U
Application number: CN201920430039.5U
Authority: CN
Inventors: 李斐然; 梁柯峰; 李迅; 曹旭; 张理; 闫飞; 黄亚飞
Original assignee: Henan Provincial Communication Planning and Design Institute Co Ltd
Current assignee: Henan Provincial Communication Planning and Design Institute Co Ltd
Priority date: 2019-04-01
Filing date: 2019-04-01
Publication date: 2020-01-31
Anticipated expiration: 2029-04-01

Abstract

The utility model discloses a be used for outer protecting cylinder of pile foundation reinforcement, including the outer protection barrel of clearance suit at former pile foundation, the protection barrel is strengthened inlayer, glass fiber protection middle level and the outer constitution of wearing and tearing by the steel sheet, balanced interval has set firmly the horizontal welding nail on the inner wall of inlayer is strengthened to the steel sheet the pouring has the concrete sandwich layer in the annular gap between the inlayer is strengthened to former pile base member outer wall and steel sheet, the utility model has the advantages of simple structure, site operation is convenient, will protect the barrel to design into the sandwich plate structure who strengthens inlayer, glass fiber protection middle level and the outer constitution of wearing and tearing by the steel sheet, both can play the effect of recovering pile head bearing capacity, can reach the purpose that improves pile foundation durability again.

Description

Be used for reinforced (rfd) outer protecting cylinder of pile foundation

Technical Field

The utility model relates to a highway and municipal bridge reinforcement technology especially relate to kinds of outer protecting tube that are used for pile foundation reinforcement.

Background

According to the detection result of the bridge, most of pile foundations in the river can cause the problems of pile head exposure to the river bed, necking, concrete peeling, steel bar corrosion exposure and the like due to various reasons such as design, construction, river bed scouring and the like, and the problems are very likely to endanger the safety of the bridge substructure: the pile side soil body is scoured to cause the stress mode of the pile foundation to be changed, and the bending moment borne by the pile foundation is increased; the necking phenomenon can seriously reduce the ultimate bearing capacity of the pile foundation at the position; the durability of the structure is seriously affected by the peeling of concrete and the corrosion of reinforcing steel bars, and the service life of the lower structure is further affected. Therefore, measures need to be taken in time to reinforce the exposed position of the pile foundation after the occurrence of the disease.

The currently adopted pile foundation reinforcing methods comprise a steel plate wrapping method, a concrete section expanding method, a glass fiber sleeve reinforcing method and the like. Although the methods can protect the scoured part of the pile foundation, the methods also have the defect of limited application range. The method such as the steel plate wrapping method has the problems of steel plate durability, difficult mechanical and manual operation under the construction condition with a bearing platform and the like; the cross section expanding method has more complicated construction processes, such as erecting templates, binding stirrups and longitudinal steel bars, and the like. The method for reinforcing the glass fiber sleeve is limited by underwater construction conditions, the durability and wear resistance of the material, and more importantly, the method cannot reinforce the damaged part of the pile foundation.

Chinese utility model patent (No. CN 204139192U) discloses novel pile foundation reinforcing devices, but still there are still a lot of inconveniences in the device is applied to the pile group foundation with a cushion cap, is that the construction space of the pile head construction position under the cushion cap is limited, lifting equipment cannot be adopted, and each steel casing is heavy in weight and difficult to install manually, and secondly, the adopted steel casing still has the problem of corrosion resistance, is in a dry-wet alternative environment for a long time, and simultaneously, the scouring of rivers can also damage the protective paint film of the steel casing, so the application range of the method is limited.

The Chinese invention patent (publication No. CN 105569101A) discloses devices suitable for repairing and reinforcing underwater parts of pile foundations and a construction method using the devices, the method is simple and convenient to construct and can carry out underwater construction, but the method cannot play a role in reinforcing an original pile head structure, and the reliability of organic materials needs to be further tested by because the material performance of the organic materials is changed under the action of ultraviolet rays.

Disclosure of Invention

An object of the utility model is to provide a a be used for a pile foundation reinforced (rfd) outer protecting cylinder, this outer protecting cylinder can play the effect of resume pile head bearing capacity, can improve the durability of pile foundation again.

In order to achieve the above purpose, the utility model can adopt the following technical proposal:

the utility model discloses an outer protecting cylinder for pile foundation reinforcement, including the protection barrel of clearance suit outside the former pile foundation, the protection barrel comprises steel sheet reinforcement inlayer, glass fiber protection middle level and wearing and tearing skin, the balanced interval sets firmly horizontal welding nail on the inner wall of steel sheet reinforcement inlayer; and a concrete core layer is poured in an annular gap between the outer wall of the original pile matrix and the steel plate reinforced inner layer.

And fixing bolts are horizontally implanted into the original pile base body corresponding to the positions of the horizontal welding nails, the horizontal welding nails are connected into bodies through connecting sleeves and the fixing bolts, and the length of the fixing bolts penetrating into the original pile base body is at least 6.5 times of the diameter of the bolts.

The thickness of the glass fiber protection middle layer is 3mm, and the abrasion outer layer is a stainless steel plate with the thickness of 3 mm.

For convenient construction, the steel plate reinforcing inner layer is formed by splicing 3-5 arc-shaped unit pieces.

Adhesive layers are respectively coated between the steel plate reinforcing inner layer and the glass fiber protection middle layer and between the glass fiber protection middle layer and the abrasion outer layer.

The utility model has the advantages of simple structure, site operation is convenient. The protective cylinder body is designed into a sandwich plate structure consisting of a steel plate reinforced inner layer, a glass fiber protective middle layer and a wear outer layer, so that the effect of recovering the bearing capacity of the pile head can be achieved, and the aim of improving the durability of the pile foundation can be fulfilled.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a view from a-a of fig. 1.

Fig. 3 is a schematic illustration of the splicing of the steel plate reinforced inner layer of fig. 1.

Detailed Description

As shown in figures 1-3, the utility model discloses an outer protecting cylinder for pile foundation reinforcement, including the protection barrel of clearance suit outside former pile base member 1, this protection barrel comprises steel sheet reinforcement inlayer 2, glass fiber protection middle level 3 and wearing and tearing skin 4, between steel sheet reinforcement inlayer 2 and the glass fiber protection middle level 3, the viscose layer has coated respectively between glass fiber protection middle level 3 and the wearing and tearing skin 4, the sandwich panel structure is formed through the bonding to the three-layer structure, balanced interval has set firmly horizontal welding nail 5 on the inner wall of steel sheet reinforcement inlayer 2, it has concrete core layer 6 to pour into in the annular gap between former pile base member 1 outer wall and steel sheet reinforcement inlayer 2, the former pile base member 1 that corresponds with each horizontal welding nail 5 position goes up the level and has implanted fixing bolt 7, each horizontal welding nail 5 links to bodies through connecting sleeve 8 and fixing bolt 7.

In order to ensure the strength of the pile, the length of the fixing bolt 7 which penetrates into the original pile foundation body 1 is at least 6.5 times of the diameter of the bolt.

Wherein the thickness of the glass fiber protection middle layer 3 is 3mm, and the abrasion outer layer 4 adopts a stainless steel plate with the thickness of 3 mm.

For convenient site operation, the steel plate reinforcing inner layer 2 is formed by splicing 3-5 ( can be four) arc-shaped unit pieces prefabricated in advance in a factory.

Adopt the utility model discloses a reinforcing apparatus consolidates the construction steps who damages pile foundation head and does:

(1) building a temporary construction facility at the position of the pile matrix 1 to be reinforced, and building a temporary cofferdam if the pile matrix is in water;

(2) determining the thickness required by the steel plate reinforced inner layer 2 and the thickness of the poured concrete core layer 6 according to the disease condition of the pile matrix and the calculation result, wherein the thickness of the steel plate reinforced inner layer 2 (the thickness of the steel plate) is not less than 8mm and the thickness of the concrete core layer 6 is not less than 30 mm;

(3) determining the number and the spacing of the fixing bolts 7 and the horizontal welding nails 5 according to the interface bonding strength between the concrete core layer 6 and the original pile foundation body 1 and the interface bonding strength between the concrete core layer 6 and the steel plate reinforcing inner layer 2;

(4) chiseling and removing loose concrete on the surface of the original pile matrix 1, then performing chiseling treatment on the surface, performing rust removal treatment on the original rust steel bars, and then implanting fixing bolts 7 into the pile matrix 1;

(5) processing the arc-shaped unit pieces of the steel plate reinforcing inner layer 2 according to the design size in a factory (under the normal condition, the arc-shaped unit pieces can be evenly divided into four arc-shaped unit pieces), welding the horizontal welding nails 5 obtained through calculation on the arc-shaped unit pieces, and welding the arc-shaped unit pieces as shown in fig. 3;

(6) the fixing bolt 7 and the horizontal welding nail 5 can be aligned in a manual installation mode in a construction site, and the fixing bolt 7 and the horizontal welding nail 5 are connected into an body by adopting a mechanical connecting sleeve 8;

(7) four arc-shaped unit slices are connected into a whole steel plate reinforcing inner layer 2 in a welding mode;

(8) pouring a concrete core layer 6 in an annular gap between the steel plate reinforced inner layer 2 and the original pile foundation body 1, wherein the core filling concrete is self-compacting concrete with the weight of above C40 so as to ensure that the pouring is compact;

(9) the glass fiber protective middle layer 3 is adhered to the outer surface of the steel plate reinforced inner layer 2 in an adhesive manner, the thickness is at least 3mm, and the adhesive needs to meet the specification in a table 4.6.2 in the Highway bridge reinforcing design Specification (JTG/T J22-2008);

(10) a wearing outer layer 4 (a stainless steel plate with the thickness of at least 3mm can be adopted) is stuck on the outer surface of the glass fiber protection middle layer 3, and finally stainless steel nails are adopted for fixing at the interface;

(11) and (5) removing the built temporary construction facilities to finish the reinforcement of the damaged pile foundation head.

Claims

The external protective cylinder for pile foundation reinforcement is characterized by comprising a protective cylinder body which is sleeved outside an original pile base body (1) in a clearance mode, wherein the protective cylinder body is composed of a steel plate reinforced inner layer (2), a glass fiber protective middle layer (3) and a wear outer layer (4), horizontal welding nails (5) are fixedly arranged on the inner wall of the steel plate reinforced inner layer (2) at regular intervals, and a concrete core layer (6) is poured in an annular gap between the outer wall of the original pile base body (1) and the steel plate reinforced inner layer (2).
2. The outer protective sleeve for pile foundation reinforcement according to claim 1, wherein a fixing bolt (7) is horizontally implanted on the original pile base body (1) corresponding to the position of each horizontal welding nail (5), and each horizontal welding nail (5) is connected into an body through a connecting sleeve (8) and the fixing bolt (7).
3. The outer jacket tube for pile foundation reinforcement of claim 2, wherein: the length of the fixing bolt (7) penetrating into the original pile base body (1) is at least 6.5 times of the bolt diameter.
4. The outer jacket tube for pile foundation reinforcement of claim 1, wherein: the thickness of the glass fiber protection middle layer (3) is 3mm, and the abrasion outer layer (4) is a stainless steel plate with the thickness of 3 mm.
5. The outer jacket tube for pile foundation reinforcement of claim 1, wherein: the steel plate reinforcing inner layer (2) is formed by splicing 3-5 arc-shaped unit pieces.
6. The outer jacket tube for pile foundation reinforcement of claim 1, wherein: adhesive layers are respectively coated between the steel plate reinforcing inner layer (2) and the glass fiber protection middle layer (3) and between the glass fiber protection middle layer (3) and the abrasion outer layer (4).