CN210086231U

CN210086231U - Large-diameter high-performance UHPC-steel pipe composite pile foundation

Info

Publication number: CN210086231U
Application number: CN201920216963.3U
Authority: CN
Inventors: 郑和晖; 张永涛; 王敏; 彭成明; 巫兴发; 田飞; 李刚; 代浩; 彭志辉; 陈飞翔; 杨荣辉; 刘力; 徐鑫; 王江成
Original assignee: CCCC Second Harbor Engineering Co; CCCC Highway Long Bridge Construction National Engineering Research Center Co Ltd
Current assignee: CCCC Second Harbor Engineering Co; CCCC Highway Long Bridge Construction National Engineering Research Center Co Ltd
Priority date: 2019-02-20
Filing date: 2019-02-20
Publication date: 2020-02-18
Anticipated expiration: 2029-02-20

Abstract

The utility model discloses a major diameter high performance UHPC-steel pipe composite pile foundation, include: the steel pipe composite pile comprises a UHPC-RC composite pile, a steel pipe composite pile and a joint, wherein the UHPC-RC composite pile and the steel pipe composite pile are connected through the joint, and the joint is positioned below a lowest scouring line. The utility model discloses a composite pile foundation compares in traditional pile foundation, can not only accelerate construction speed, and possesses better economic nature, bearing capacity and good durability.

Description

Large-diameter high-performance UHPC-steel pipe composite pile foundation

Technical Field

The utility model relates to a pile foundation structure form among the civil engineering field, in particular to large diameter pile foundation construction technique among sea bridge and the wind-powered electricity generation engineering strides under the marine corrosion environment. More specifically, the utility model relates to a major diameter high performance UHPC-steel pipe composite pile foundation.

Background

At present, the development of ocean resources is more and more intensive in China, the growth of construction projects of cross-sea bridges, wind power and other projects is considerable, and due to the high wind and wave urgency and the strong corrosive ocean environment, the construction of the foundation structure is a serious difficulty in the construction of the project.

For the construction of a structure foundation under the marine environment, a cast-in-place pile and a large-diameter steel pipe pile are mainly adopted at present, the traditional cast-in-place pile is low in construction efficiency, the large-diameter steel pipe pile is high in construction cost and poor in economical efficiency due to the fact that the construction efficiency is improved, and long-term corrosion-resistant protection is needed.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an aim at provides major diameter high performance UHPC-steel pipe composite pile foundation, compares in traditional pile foundation, can not only accelerate construction speed, and possesses better economic nature, bearing capacity and good durability.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a large-diameter high-performance UHPC-steel pipe composite pile foundation, comprising: the steel pipe composite pile comprises a UHPC-RC composite pile, a steel pipe composite pile and a joint, wherein the UHPC-RC composite pile and the steel pipe composite pile are connected through the joint, and the joint is positioned below a lowest scouring line.

Preferably, the UHPC-RC composite pile comprises an outer UHPC casing and inner cast-in-place concrete; the steel pipe composite pile comprises an outer side steel pipe pile and inner cast-in-place concrete.

Preferably, the diameter of the composite pile foundation is greater than 2 meters.

Preferably, the wall thickness of the UHPC casing is 5-12 cm, and the wall thickness of the steel pipe pile is 1.5-3 cm.

Preferably, the inner wall of the UHPC casing comprises circumferential concave-convex grooves so as to form the shear key teeth.

Preferably, the joint is an annular steel plate which is pre-embedded in the UHPC casing, and the bottom of the steel plate and the upper end of the steel pipe pile are welded into a whole.

The utility model discloses at least, include following beneficial effect:

1. the utility model discloses a basic engineering construction of crossing sea bridge and wind-powered electricity generation engineering under the marine environment that composite pile foundation specially adapted load condition is complicated and corrosivity is strong can not only accelerate construction speed, and possesses better economic nature, bearing capacity and good durability.

2. The utility model discloses a composite pile foundation diameter coverage is wide, can reach 3 meters, 4 meters even.

3. The utility model discloses a compound pile foundation can full play UHPC protect a section of thick bamboo and steel-pipe pile's advantage, promotes bored concrete pile's efficiency of construction and steel-pipe pile's economic nature.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic structural diagram of the composite pile foundation of the present invention;

fig. 2 is the utility model discloses structure schematic diagram when compound pile foundation does not pour concrete.

Description of reference numerals:

1. the method comprises the following steps of (1) UHPC-RC composite pile, (2) steel pipe composite pile, (3) joint, (4) cast-in-place concrete, (5) UHPC pile casing, (6) steel pipe pile, (7) bearing platform.

Detailed Description

The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in fig. 1-2, the utility model provides a compound pile foundation of major diameter high performance UHPC-steel pipe, include: the composite pile comprises a UHPC-RC composite pile 1, a steel pipe composite pile 2 and a joint 3, wherein the UHPC-RC composite pile 1 and the steel pipe composite pile 2 are connected by the joint 3, and the joint 3 is positioned below a lowest brushing line. The UHPC-RC composite pile 1 comprises an outer UHPC casing 5 and inner cast-in-place concrete 4; the steel pipe composite pile 2 comprises an outer side steel pipe pile 6 and inner cast-in-place concrete 4.

In the technical scheme, the UHPC casing 5 and the steel pipe pile 6 can be used as a retaining wall for drilling and pouring the inner core cast-in-place concrete 4, the UHPC casing 5 can improve the structural durability, the corrosion prevention cost of the steel pipe pile 6 is reduced, the steel pipe pile 6 can improve the insertion driving performance, the construction progress is accelerated, and the construction quality is ensured. After the internal core cast-in-place concrete 4 is poured, the UHPC pile casing 5 and the steel pipe pile 6 can participate in structural stress, so that the bending resistance and compression resistance bearing capacity of the composite pile foundation are improved; the UHPC pile casing 5 has good compactness, can be used as a protective layer of the inner core cast-in-place concrete 4, reduces the erosion speed of chloride ions in the core concrete of a water level change area and a splash area, and improves the durability of a pile foundation structure. In order to ensure the stress performance and durability of the lower-section steel pipe composite pile 2, the joint 3 is partially arranged below the lowest flushing line, so that the corrosion speed of the steel pipe pile 6 is reduced. The utility model discloses a composite pile foundation construction method as follows:

1) determining the reasonable diameters and lengths of the UHPC casing and the steel pipe pile according to the design requirements, and performing factory prefabrication, connection and quality detection;

2) transporting the connected UHPC casing and the steel pipe pile to the position close to the pile position, and hoisting, positioning and hammering to sink;

3) sinking the pile to a specified elevation, drilling, removing slag, putting down a reinforcement cage and pouring internal core concrete;

4) the construction of the composite pile is completed, and a connecting structure with the bearing platform 7 is reserved, namely the upper end of the internally-lowered reinforcement cage protrudes out of the bearing platform 7 and is connected with the bearing platform 7 into a whole.

In another technical scheme, the diameter of the composite pile foundation is more than 2 meters. The utility model discloses a compound pile foundation diameter can accomplish more than 2 meters, according to the actual construction condition, the pile foundation of minor diameter also can be under construction equally.

In another technical scheme, the wall thickness of the UHPC casing 5 is 5-12 cm, and the wall thickness of the steel pipe pile 6 is 1.5-3 cm.

In the technical scheme, the wall thickness of the UHPC pile casing 5 is relatively thicker, generally 5-12 cm, so that on one hand, the UHPC pile casing can bear stronger hammering force when being hammered and sunk, and in fact, after the wall thickness of the UHPC pile casing 5 is thicker, the UHPC pile casing is easier to bear the hammering force than the steel pipe pile 6; on the other hand, the condition that the UHPC pile casing 5 is damaged and cracked during manufacturing, transportation and hammering is guaranteed, the steel pipe pile 6 is set to be conventional in wall thickness, and the thickness is 1.5-3 cm.

In another technical scheme, the inner wall of the UHPC casing 5 contains circumferential concave-convex grooves to form shear-resistant key teeth and enhance the stress performance of the UHPC-RC composite pile.

In the technical scheme, the interface combination of the UHPC pile casing 5 and the common cast-in-place concrete 4 is better than the combination of the traditional steel pipe pile 6 and the cast-in-place concrete 4, and the common stress performance is better; the steel pipe pile 6 is welded with annular steel bars and the like on the inner wall thereof to form a similar connecting piece, then concrete is poured, the steel pipe pile 6 and the cast-in-place concrete 4 are combined to form the steel pipe composite pile 2, but the cast-in-place concrete 4 is easy to slide; and protect a 5 inner walls at UHPC and form unsmooth shear key tooth, UHPC protects a 5 and can not produce basically after combining with cast in situ concrete 4 and slide to greatly increased cohesion between them, makeed the utility model discloses a composite pile foundation bearing capacity reinforcing.

In another technical scheme, the joint 3 is an annular steel plate which is pre-embedded in the UHPC casing 5, and the bottom of the steel plate is welded with the upper end of the steel pipe pile 6 into a whole.

In the technical scheme, when the UHPC casing 5 is prefabricated in a factory, the upper part of the joint 3 is poured on the UHPC casing 5 together, so that the upper part of the joint 3 and the UHPC casing 5 are of an integrated fixed structure, then the lower part of the joint 3 protruding out of the UHPC casing 5 is welded with the steel pipe pile 6, so that the UHPC casing 5 and the steel pipe pile 6 are connected through the joint 3, after the UHPC casing 5 and the steel pipe pile 6 are connected, the outer side walls of the UHPC casing 5 are overlapped, and concrete is poured inside the UHPC casing 5.

The utility model discloses a compound pile foundation shows such as following with conventional pile foundation each aspect:

in the above table, the force-bearing performance and material cost calculation preconditions are as follows:

(1) the external diameter of a single pile foundation is 1.6m, the length of the single pile foundation is 60m, the depth of water above the mud surface is 30m, and the depth of water is 30 m;

(2) the thickness of a temporary steel casing of the cast-in-place pile is 1.6cm, the thickness of a steel pipe of the composite pile is 3cm, and the thickness of a UHPC pipe pile is 11 cm;

(3) the cast-in-place pile concrete and the core concrete are both C30.

While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.

Claims

1. Major diameter high performance UHPC-steel pipe composite pile foundation, its characterized in that includes: the system comprises a UHPC-RC composite pile, a steel pipe composite pile and a joint, wherein the UHPC-RC composite pile and the steel pipe composite pile are connected by the joint, and the joint is positioned below a lowest scour line;

the UHPC-RC composite pile comprises an outer UHPC casing and inner cast-in-place concrete; the steel pipe composite pile comprises an outer steel pipe pile and inner cast-in-place concrete;

the joint is an annular steel plate which is pre-embedded in the UHPC casing, and the bottom of the steel plate is welded with the upper end of the steel pipe pile into a whole.

2. The large-diameter high-performance UHPC-steel pipe composite pile foundation of claim 1, wherein the diameter of the composite pile foundation is more than 2 meters.

3. The large-diameter high-performance UHPC-steel pipe composite pile foundation of claim 1, wherein the wall thickness of the UHPC casing is 5-12 cm, and the wall thickness of the steel pipe pile is 1.5-3 cm.

4. The large-diameter high-performance UHPC-steel pipe composite pile foundation of claim 1, wherein the inner wall of the UHPC casing contains circumferential concave-convex grooves to form shear key teeth.