CN212801501U

CN212801501U - Self-wall-protection large-diameter concrete hollow pipe column foundation

Info

Publication number: CN212801501U
Application number: CN202021058478.7U
Authority: CN
Inventors: 殷永高; 余其俊; 李剑鸾; 吕奖国; 杨大海; 吴平平; 唐国喜; 张振华; 窦巍; 方正东
Original assignee: Hefei University of Technology; Anhui Transportation Holding Group Co Ltd
Current assignee: Hefei University of Technology; Anhui Transportation Holding Group Co Ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2021-03-26
Anticipated expiration: 2030-06-10

Abstract

The utility model discloses a large-diameter concrete hollow pipe column foundation with a self-protecting wall, which comprises an annular dense mesh steel cage skeleton and an underwater annular protective wall. , The inner and outer layer annular stiffeners, radial ribs, inner and outer layer positioning ribs, and inner and outer layer annular dense mesh are bound and made in the factory or on-site; Formed in the gap between the mesh and the wall of the drilled hole. When the pile body is poured, the stability of the hole wall soil is maintained by the underwater annular retaining wall structure, so as to ensure the quality of the slag removal at the bottom of the borehole and the forming quality of the pile body concrete. The pile body can be cast and formed with a light inner membrane, which solves the problems of large-scale template production, hoisting and recycling, and greatly reduces the project cost.

Description

Self-wall-protection large-diameter concrete hollow pipe column foundation

The technical field is as follows:

the utility model relates to an engineering fields such as bridge engineering and ocean wind power engineering, concretely relates to from dado major diameter concrete hollow tube column basis.

Background art:

along with the construction of more and more large-span bridges, the load of the upper structure is also more and more large, and the requirement on the bearing performance of the bridge foundation is also more and more high. The traditional pile group foundation bearing platform is large in size, high in manufacturing cost and difficult to construct, and the pile length of the thick covering layer is longer and longer, and the slenderness ratio is seriously disordered. In the traditional large-diameter cast-in-place hollow pile foundation, a large-scale template needs to be externally used in the pile body pouring process, the construction measures are complex and difficult to control, and certain problems and difficulties often exist in the pile body forming quality, the demolding technology and the like. And the large open caisson has huge foundation volume, high material consumption, longer construction period and high technical requirement, and the open caisson is inclined or difficult to sink due to sand running in construction.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a self-retaining wall large-diameter concrete hollow tube column foundation, which ensures that the stability of a hole wall soil body is maintained through an underwater annular retaining wall in the cast-in-place process of the large-diameter concrete hollow tube column foundation, thereby ensuring the slag removal quality at the bottom of a drill hole; the pile body concrete of the pipe pile foundation can be poured in a clear water environment or a waterless environment, so that a high-grade concrete pile body can be realized, the durability of the pile body is stronger, and the bearing performance is more reliable.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

a self-retaining large-diameter concrete hollow tubular column foundation comprises an annular dense mesh reinforcement cage framework and an underwater annular retaining wall;

the annular dense net steel reinforcement cage framework consists of a longitudinal main rib, an annular hoop rib, an annular stiffening rib, a radial rib, a positioning rib and an annular dense net;

the longitudinal main ribs are connected through the circumferential stiffening ribs to form a frame, and the circumferential stiffening ribs are arranged in the frame for fixing;

the frame is provided with two groups, the inner layer and the outer layer are arranged in a concentric circle, a radial rib support is arranged between the two groups of frames, and a positioning rib is arranged outside the frames;

the annular dense net is provided with two layers, and is respectively and fixedly connected with the inner layer frame and the outer layer frame through positioning ribs to form a whole;

the underwater annular retaining wall is formed by pouring underwater non-separating self-compacting quick-setting concrete in a gap between the outer annular dense net and the wall of the drilled hole.

Preferably, the annular dense mesh is a dense steel wire mesh or a fiber mesh.

Preferably, the outer diameter of the framework of the annular dense mesh reinforcement cage is 10-20 cm smaller than the bore diameter of the drilled hole, and the wall thickness of the formed underwater annular retaining wall is 10-20 cm.

Preferably, the stratum with controllable confined water is within the designed pile length range, and the column body of the column can be poured in a waterless environment by using C40 and above high-grade concrete to achieve a high-strength pile body.

Advantageous effects

1. The self-retaining large-diameter concrete hollow pipe column foundation is created, and when the pile body is poured, the stability of a soil body of a hole wall is maintained through an underwater annular retaining wall structure, so that the slag removal quality of the bottom of a drill hole and the forming quality of the concrete of the pile body are ensured;

2. the pile body pouring of the pipe pile foundation can be finished only by the self structure and the light inner film without externally using a large template, so that the problems of manufacturing, hoisting, recovering and the like of the large template are solved, the field construction is quicker and more efficient, and the construction cost is greatly reduced;

3. the pile body concrete can be poured in a clear water environment, and the pouring in a waterless environment of the pile body can be realized in a stratum with controllable bearing water within a designed pile length range, so that the high-grade concrete pile body can be realized, the durability of the pile body is stronger, and the bearing performance is more reliable.

Description of the drawings:

in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts;

FIG. 1 is a schematic elevation view of a self-retaining large diameter concrete hollow tubular column foundation;

FIG. 2 is a schematic vertical view of a framework of an annular dense mesh reinforcement cage;

in the figure, 1 a-longitudinal main reinforcement, 1 b-circumferential hoop reinforcement, 1 c-circumferential stiffening reinforcement, 1 d-radial reinforcement, 1 e-positioning reinforcement, 2-annular dense net and 3-underwater annular retaining wall.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Example (b):

a self-retaining large-diameter concrete hollow pipe column foundation comprises an annular dense mesh reinforcement cage framework and an underwater annular retaining wall 3. The annular dense net steel reinforcement cage framework is composed of a longitudinal main reinforcement 1a, an annular hoop reinforcement 1b, an annular stiffening reinforcement 1c, a radial reinforcement 1d, a positioning reinforcement 1e and an annular dense net 2.

In the implementation, the framework of the annular dense net steel reinforcement cage is provided with two layers, and the structure is manufactured by binding an inner-layer longitudinal main rib, an inner-layer annular stirrup, an outer-layer annular stiffening rib, an inner-layer annular stiffening rib, a radial rib 1d, a positioning rib 1e and an inner-layer annular dense net in a factory or on site. Wherein, the longitudinal main muscle of inlayer outside and outside layer, inlayer hoop reinforcement, radial muscle 1d, the inlayer location muscle of internal and external ring of earlier whole ligature, rethread inlayer location muscle realize that the dense net of inlayer and external ring shape is connected with the lacing wire fastening of steel reinforcement cage skeleton.

The implementation of the large-diameter concrete hollow pipe column foundation comprises a large-diameter drilling underwater annular retaining wall forming step, a bottom sealing concrete forming step, an underwater flexible core mould lowering step and a pile body pouring forming step.

The forming step of the large-diameter drilling underwater annular retaining wall comprises the following steps: drilling into a hole at a designed pile position, then lowering the annular dense net steel reinforcement cage framework to a designed elevation, and pouring underwater non-separation self-compacting rapid-hardening concrete into a gap between the outer layer annular dense net and the wall of a drilled hole to form the concrete. The outer positioning rib can ensure the downward placement and positioning of the annular dense mesh reinforcement cage framework and can also ensure the thickness of the pile body concrete protective layer;

the forming step of the bottom sealing concrete is as follows: and after the underwater annular protection wall is formed, removing slag at the bottom of the hole, and then pouring and encapsulating bottom concrete at the bottom of the hole for forming. The forming of the underwater annular retaining wall can ensure the quality of slag removal at the bottom of the drilled hole, thereby solving the problems that the drilled hole filling pile is difficult to remove the drilled hole and difficult to reach the standard at present.

The underwater flexible core mould lowering step comprises: and after the bottom sealing concrete is poured, filling water and lowering the flexible core mold to the designed elevation. The internal and external water heads of the core die are kept to be balanced as much as possible in the process of lowering the flexible core die until the interior of the flexible core die is completely expanded and closely attached with the inner-layer annular dense net, and the underwater annular retaining wall, the bottom sealing concrete and the flexible core die form an annular U-shaped pipe wall. The use of the underwater flexible core mold enables the large-diameter hollow pipe column foundation to be free of an external large-scale template in the cast-in-place process, reduces field construction measures and greatly reduces construction cost.

The pile body pouring and forming steps are as follows: and (2) spraying the inner wall (namely the annular dense mesh reinforcement cage framework part) of the U-shaped pipe wall by using a high-pressure water gun to remove mud and sand attached to the pipe wall, replacing slurry in the U-shaped pipe wall by using clean water, and pouring pile body concrete into the U-shaped pipe wall until the pipe pile is formed after the slurry in the U-shaped pipe wall is diluted to a certain standard by using the clean water. In the stratum with controllable bearing water within the designed pile length range, after a high-pressure water gun is used for spraying the inner wall of the U-shaped pipe wall to remove silt attached to the pipe wall, muddy water in the U-shaped pipe wall can be pumped out, and then C40 or above high-grade concrete is poured into the U-shaped pipe wall for molding, so that the high-strength pile body is realized.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a from dado major diameter concrete hollow tube column basis which characterized in that: the structure comprises an annular dense mesh reinforcement cage framework and an underwater annular protective wall;

2. A self-retaining large diameter concrete hollow tubular column foundation as claimed in claim 1 wherein: the annular dense net is a dense steel wire net or a fiber net.

3. A self-retaining large diameter concrete hollow tubular column foundation as claimed in claim 1 wherein: the outer diameter of the framework of the annular dense mesh reinforcement cage is 10-20 cm smaller than the bore diameter of the drill hole, and the wall thickness of the formed underwater annular protective wall is 10-20 cm.