阅读说明：本技术 一种现浇大直径空心管柱基础水下芯模体系 (Underwater core mould system for cast-in-situ large-diameter hollow pipe column foundation ) 是由 殷永高 李剑鸾 吴平平 杨大海 余竹 吴志刚 张振华 慈伟主 于 2020-06-10 设计创作，主要内容包括：本发明公开了一种现浇大直径空心管柱基础水下芯模体系,包括环形密致网钢筋笼骨架和柔性芯模,环形密致网钢筋笼骨架包含纵向主筋、环向箍筋、环向加劲筋、径向筋、定位筋和环形密致网。实施时,充水下放柔性芯膜使得芯模内部完全涨开至密贴环向密致网形成水下芯模体系,之后浇筑管身混凝土成型。其有益效果：解决了传统大直径空心管柱现场难以成型的难题,大直径空心管柱基础在现场浇筑过程中无需外用大型模板,仅依靠管柱自身环形密致网钢筋笼骨架和柔性芯模作为管柱基础成型的内模,在柱身混凝土浇筑完成后,柔性芯膜轻松回收重复利用。(The invention discloses a cast-in-place large-diameter hollow pipe column foundation underwater core mold system which comprises an annular dense net reinforcement cage framework and a flexible core mold, wherein the annular dense net reinforcement cage framework comprises a longitudinal main rib, an annular stirrup, an annular stiffening rib, a radial rib, a positioning rib and an annular dense net. When the underwater core mold is implemented, the flexible core film is put down by filling water, so that the interior of the core mold is completely expanded to be closely attached to the annular dense net to form an underwater core mold system, and then the pipe body concrete is poured for forming. The beneficial effects are as follows: the problem that a traditional large-diameter hollow pipe column is difficult to form on site is solved, a large-scale template does not need to be externally used in the cast-in-place process of a large-diameter hollow pipe column foundation, the tubular column self annular dense mesh reinforcement cage framework and the flexible core mold are only used as an internal mold for forming the tubular column foundation, and after concrete pouring of a column body is completed, the flexible core mold is easily recycled and reused.)

1. An underwater core mould system for a cast-in-place large-diameter hollow pipe column foundation is characterized by comprising an annular dense mesh reinforcement cage framework and a flexible core mould;

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 fixedly connected with the inner layer framework through the positioning ribs to form a whole;

the flexible core mold is positioned in the frame of the inner layer.

2. The underwater mandrel system for the cast-in-place large-diameter hollow pipe column foundation as claimed in claim 1, wherein the annular dense mesh is a dense steel wire mesh or a fiber mesh.

3. A cast-in-place large diameter hollow pipe column foundation underwater mandrel system as claimed in claim 1, wherein the underwater mandrel forming comprises the steps of:

a) forming a hole at the pile position, and removing slag at the bottom of the hole;

b) putting down the ring-shaped dense net reinforcement cage framework to a designed elevation;

c) and (3) filling water and lowering the flexible core mold to a designed elevation, restraining the transverse deformation of the flexible core mold in the water filling process by means of the radial hoop action of the annular dense net and certain radial rigidity of the flexible core mold, and expanding the water filling of the flexible core mold and attaching the annular dense net to the flexible core mold to form the hollow pipe column foundation underwater core mold system.

4. The underwater core mold system for the cast-in-place large-diameter hollow pipe column foundation as claimed in claim 1, wherein the flexible core film is recycled after the pile body is cast.

The technical field is as follows:

the invention relates to the field of engineering such as bridge engineering and ocean wind power engineering, in particular to an underwater core mould system for a cast-in-place large-diameter hollow pipe column foundation.

Background art:

in civil engineering construction, due to the increase of upper structure load and the limitation of geological conditions, a large-diameter bored pile foundation is often required to be used, and the large-diameter hollow cast-in-place pile foundation has more advantages in the selection of pile foundations in civil engineering construction due to the saving of base materials and the reduction of the dead weight of a pile body. The cast-in-place of the traditional large-diameter hollow cast-in-place pile needs to use a large steel formwork, so that the pile foundation cost is too high, the large steel formwork is complex in manufacturing, transporting, transferring and connecting, and the construction difficulty of the project is greatly increased.

The invention content is as follows:

aiming at the defects of the prior art, the invention provides a cast-in-place large-diameter hollow pipe column foundation underwater core mould system, which solves the problem that the traditional large-diameter hollow pipe column is difficult to form on site. The large-diameter hollow pipe column foundation does not need an external large-scale template in the cast-in-place process, only depends on a structural system formed by the pile foundation self annular dense mesh reinforcement cage framework and the flexible core mold to serve as a pipe column foundation forming internal mold, and after the pouring of pile body concrete is completed, the flexible core mold is easily recycled and reused. An underwater core mould system for a cast-in-place large-diameter hollow pipe column foundation 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, enables field construction to be fast and efficient, and greatly reduces construction cost.

In order to achieve the purpose, the invention is realized by the following technical scheme:

an underwater core mould system for a cast-in-place large-diameter hollow pipe column foundation comprises an annular dense mesh reinforcement cage framework and a flexible core mould;

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 fixedly connected with the inner layer framework through the positioning ribs to form a whole;

the flexible core mold has certain tensile strength and higher air tightness, and further can be a stiffening rubber core mold;

further, the flexible core mold may be a stiffened rubber core mold.

The forming method of the underwater core mould system of the cast-in-situ large-diameter hollow pipe column foundation comprises the following steps:

a) forming a hole at the pile position, and removing slag at the bottom of the hole;

b) putting down the ring-shaped dense net reinforcement cage framework to a designed elevation;

c) and (3) filling water and lowering the flexible core mold to a designed elevation, restraining the transverse deformation of the flexible core mold in the water filling process by means of the radial hoop action of the annular dense net and certain radial rigidity of the flexible core mold, and expanding the water filling of the flexible core mold and attaching the annular dense net to the flexible core mold to form the hollow pipe column foundation underwater core mold system.

Optimally, the aperture of the annular dense net is 3.5 cmx3.5cm.

Furthermore, after the pile body is poured, water in the flexible core film can be pumped out, and the flexible core film is recycled.

Has the advantages that:

the invention provides an underwater core mould system for a cast-in-place large-diameter hollow pipe column foundation, which has the beneficial effects that:

1. an underwater core mould system of a cast-in-place large-diameter hollow pipe column foundation is created, the on-site high-efficiency and high-quality pouring of a square large-diameter hollow pipe column foundation is realized, and the problem that the traditional large-diameter pipe column is difficult to form on site is solved;

2. the underwater core mould system of the cast-in-place large-diameter hollow pipe column foundation is created, so that an external large-scale template is not needed in the cast-in-place process of the large-diameter hollow pipe column foundation, the field construction measures are reduced, the field construction is rapid and efficient, and the construction cost is greatly reduced.

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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic elevation view of an underwater core mold system for a cast-in-place large-diameter hollow tubular column foundation;

FIG. 2 is a schematic plan view of an underwater core mold system for a cast-in-place large-diameter hollow tubular column foundation;

FIG. 3 is a schematic vertical view of a framework of an annular dense mesh reinforcement cage;

FIG. 4 is a schematic view of a flexible mandrel configuration;

in the figure, 1 a-longitudinal main reinforcement, 1 b-circumferential hooping, 1 c-circumferential stiffening reinforcement, 1 d-radial reinforcement, 1 e-positioning reinforcement, 2-annular dense net and 3-flexible core mold.

The specific implementation mode is as follows:

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

An underwater core mould structure of a cast-in-situ large-diameter hollow pipe column foundation comprises an annular dense mesh reinforcement cage framework and a flexible core mould 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 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 annular dense net 2 in a factory or on site. The dense net of annular realizes through inlayer location muscle and steel reinforcement cage skeleton that the string net is connected and forms wholly, and inlayer location muscle welds on inlayer owner muscle to be separated by a determining deviation hoop and vertical even arrangement, the interior pipe wall reinforcing bar protective layer thickness after accessible inlayer location muscle assurance pipe shaft shaping simultaneously.

After the annular dense mesh reinforcement cage framework is manufactured in the field, the annular dense mesh reinforcement cage framework is hung in the pile hole to the designed elevation, and the flexible core mold 3 is placed under water to the designed elevation. After the flexible core mold 3 is filled with water and is expanded to be closely attached to the annular dense net 2, the flexible core mold 3 and the annular dense net 2 form a pipe pile core mold system at the moment due to the radial hooping effect of the annular dense net 2 and the flexible core mold 3. And then pouring pile body concrete into the annular dense mesh reinforcement cage framework, after the pile body of the pipe column is formed and the pile body concrete reaches a certain strength, pumping water into the flexible core mold 3, and recovering the flexible core mold 3.

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 embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.