阅读说明：本技术 倒八字现浇弧形翼腹板模架体系的施工方法 (Construction method of inverted splayed cast-in-place arc-shaped wing web formwork system ) 是由 黄剑颖 覃晓滨 雷苗华 岳文飞 张胥 石振 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种倒八字现浇弧形翼腹板模架体系的施工方法,其特征在于包括如下步骤：(一)场地平整及地基处理；(二)弯制弯曲钢管；(三)搭设满堂式碗扣脚手架；(四)底模安装及支架预压；(五)翼板模板安装；(六)消除非弹性变形；(七)测量弹性变形；(八)钢筋安装及内模拼装。本发明采用碗扣式脚手架木模构成箱梁模架体系,利用现有的弯曲机完成钢管弯曲和竹胶板替代笨重的钢模组成弧形翼板模板体系,可更好的利用空间和时间上的优势,以达到快速施工目的。(The invention discloses a construction method of an inverted splayed cast-in-place arc-shaped wing web formwork system, which is characterized by comprising the following steps of: firstly, flattening a field and treating a foundation; (II) bending a bent steel pipe; thirdly, erecting a full hall type bowl buckle scaffold; fourthly, bottom die installation and support prepressing are carried out; fifthly, installing a wing plate template; sixthly, eliminating inelastic deformation; (VII) measuring elastic deformation; and (eighthly) installing the steel bars and assembling the internal mold. The invention adopts the bowl-buckled scaffold wood formwork to form a box girder formwork system, utilizes the existing bending machine to finish steel pipe bending, and utilizes the bamboo plywood to replace a heavy steel formwork to form an arc-shaped wing plate formwork system, thereby better utilizing the advantages of space and time to achieve the purpose of quick construction.)

1. The construction method of the inverted splayed cast-in-place arc-shaped wing web formwork system is characterized by comprising the following steps of:

firstly, flattening a field and treating a foundation; (II) bending a bent steel pipe; thirdly, erecting a full hall type bowl buckle scaffold; fourthly, bottom die installation and support prepressing are carried out; fifthly, installing a wing plate template; sixthly, eliminating inelastic deformation; (VII) measuring elastic deformation; (eighth) installing reinforcing steel bars and assembling an internal mold;

in the step (II), calculating and determining the arc length, the radius, the arc starting point and the arc end point of the bent steel pipe according to the size of the box girder and the reserved length;

the installation of the arc-shaped wing plate template in the step (five) comprises the following steps: the bent steel pipe (3) is installed on the bowl-buckled scaffold (4) according to control points and fixed, then the wood balk (5) is laid on the bent steel pipe (3) according to intervals and fixed, and the wing plate template (6) is slowly bent and attached to the wood balk (5) by means of deflection of the wing plate template (6) and fixed.

2. The construction method of the inverted V-shaped cast-in-place arc-shaped wing web formwork system according to claim 1, wherein in the step (I), the field is leveled and the foundation is treated, and the compactness of the foundation is controlled to be more than or equal to 93%.

3. The construction method of the inverted splayed cast-in-place arc-shaped wing web formwork system according to claim 2, wherein the step (I) of site leveling and foundation treatment comprises the following steps: and constructing drainage ditches on two sides of the foundation.

4. The construction method of the inverted splayed cast-in-place arc-shaped wing web formwork system according to claim 1, wherein the step (I) of site leveling and foundation treatment comprises the following steps: c20 concrete cushion layers with the thickness of 10-15 m are paved on the foundation.

5. The construction method of the inverted splayed cast-in-place arc-shaped wing web formwork system according to claim 1, wherein in the step (two) of bending the bent steel pipe, the specification of the bent steel pipe is phi 48 x 3.5 mm.

6. The construction method of the inverted-splayed cast-in-place arc-shaped wing web formwork system according to claim 1, wherein the step (three) of erecting a full-framing type bowl-buckled scaffold comprises the following steps: the bowl-buckled scaffold (4) is erected from the center of a web plate to two sides according to a measured control point, the base of the vertical rod is firmly fixed, the top of the vertical rod is provided with an adjustable jacking, and the ground sweeping rod, the bridging rod and the sealing ejector rod are arranged at the same time.

7. The construction method of the inverted splayed cast-in-place arc-shaped wing web formwork system according to claim 1, wherein the step (four) of bottom formwork installation and support pre-pressing comprises the following steps: two steel pipes are transversely paved on the erected bowl-buckled scaffold (4), then the wood purlin (5) is arranged on the steel pipes according to intervals, and then the box girder bottom template (7) is spliced on the wood purlin (5) according to control points and fixed.

8. The construction method of the inverted splayed cast-in-place arc-shaped wing web formwork system according to claim 1, characterized in that in the arc-shaped wing plate formwork of the step (five), a bamboo plywood is adopted as the wing plate formwork (6).

Technical Field

The invention belongs to the technical field of bridge construction, and particularly relates to a construction method of an inverted splayed cast-in-place arc-shaped wing web formwork system.

Background

The bridge design form is various, and modern bridge cross section form has the characteristics of gradual change formula. Most construction enterprises adopt the customization steel mould to be under construction in the work progress more, and the steel mould is to the bridge of little volume, and the cost obviously increases, and the steel mould has the defect of can not repeated turnover on the one hand, and on the other hand steel mould dead weight is great, and hoist and mount technical requirement is high, causes the incident easily.

The prior art close to the invention is a Chinese invention patent (application number 201610101083.2), which relates to a construction method of a prestressed concrete variable cross-section continuous box girder, and relates to a plurality of construction procedures, wherein the construction procedures mainly comprise the steps of erecting a bowl-buckled scaffold, and connecting a shaping steel frame, a bottom die, box girder side dies, an inner die and a bottom die support construction die frame system. The method improves the template assembly part, the reinforcement binding and the reserved hole part setting, and the box girder bottom plate and web plate concrete pouring part in the existing prestressed concrete variable cross section fish-bellied continuous box girder construction method, reduces the construction difficulty, and simplifies the construction of the prestressed concrete variable cross section fish-bellied continuous box girder and has convenient operation. But it still has disadvantages: (1) the invention relates to a prestressed concrete variable cross-section construction method, which adopts a large number of customized steel dies, has large steel consumption, and the assembly process sequence strictly conforms to the numbering sequence of the steel dies, and the steel die numbering is worn to increase the assembly difficulty of the templates. (2) The invention adopts a large number of steel moulds, the steel moulds have large volume, the construction site is difficult to meet the requirement of stacking the steel moulds, and the storage difficulty is increased. (3) The middle steel die is easily affected by weather humidity and easily rusted, and needs to be subjected to rust removal and polishing treatment before die splicing in the later period, so that the construction labor cost is increased.

Disclosure of Invention

Aiming at the problems, the invention provides a construction method of an inverted splayed cast-in-place arc-shaped wing web formwork system, which adopts a bowl-buckled scaffold wood formwork to form a box girder formwork system, utilizes the existing bending machine to finish steel pipe bending and adopts a bamboo plywood to replace a heavy steel formwork to form an arc-shaped wing plate formwork system, and can better utilize the advantages of space and time so as to achieve the purpose of quick construction.

The invention is realized by the following technical scheme.

The construction method of the inverted splayed cast-in-place arc-shaped wing web formwork system is characterized by comprising the following steps of: firstly, flattening a field and treating a foundation; (II) bending a bent steel pipe; thirdly, erecting a full hall type bowl buckle scaffold; fourthly, bottom die installation and support prepressing are carried out; fifthly, installing a wing plate template; sixthly, eliminating inelastic deformation; (VII) measuring elastic deformation; (eighth) installing reinforcing steel bars and assembling an internal mold;

in the step (II), calculating and determining the arc length, the radius, the arc starting point and the arc end point of the bent steel pipe according to the size of the box girder and the reserved length;

the installation of the arc-shaped wing plate template in the step (five) comprises the following steps: and (3) mounting the bent steel pipes on the bowl-buckled scaffold according to the control points and fixing, then laying the wood purlin on the bent steel pipes according to the intervals for fixing, and slowly bending and attaching the wing plate template to the wood purlin by using the deflection of the wing plate template and fixing.

As a specific technical scheme, in the step (I), the field is leveled and the foundation is treated, and the compactness of the foundation is controlled to be more than or equal to 93 percent.

As a specific technical scheme, the site leveling and foundation treatment in the step (I) comprises the following steps: and constructing drainage ditches on two sides of the foundation.

As a specific technical scheme, the site leveling and foundation treatment in the step (I) comprises the following steps: c20 concrete cushion layers with the thickness of 10-15 m are paved on the foundation.

In the step (two), the bent steel pipe is a steel pipe with a specification of phi 48 x 3.5 mm.

As a specific technical scheme, step (three) set up full hall formula bowl and detain scaffold frame and include: the control point for placing the bowl-buckled scaffold according to the measurement is erected from the center of the web plate to two sides, the base of the vertical rod is firmly fixed, the adjustable jacking support is arranged at the top of the vertical rod, and the ground sweeping rod, the bridging rod and the sealing ejector rod are arranged at the same time.

As a specific technical scheme, the bottom die mounting and support prepressing in the step (four) comprises the following steps of: transversely laying two steel pipes on the erected bowl-buckled scaffold, then arranging wood purlins on the steel pipes according to intervals, and then splicing and fixing box girder bottom templates on the wood purlins according to control points.

And (5) adopting a bamboo plywood as the wing plate template in the arc-shaped wing plate template in the step (five).

The invention has the beneficial effects that:

in the construction method, the materials used for designing the support system are light, so that the installation, the disassembly and the transportation are convenient, the installation of the formwork system adopts manual installation, the process installation is simple and convenient, no major mechanical operation process exists, and the mechanical noise pollution is reduced; materials such as wood balk, template and the like can be repeatedly used in a turnover way, so that the use is more convenient; the bending operation of the arc-shaped wing plate steel pipe is simple, convenient and quick, the erection of the wing plate setting support is convenient, the steel mould customizing process is reduced, and the working links of managers are reduced.

Drawings

FIG. 1 is a schematic view of the construction of the present invention;

FIG. 2 is a schematic view of the construction of the present invention for site leveling and foundation treatment;

FIG. 3 is a schematic view of the construction of bending a steel pipe according to the present invention;

FIG. 4 is a schematic construction diagram of the bowl-lock scaffold set up according to the present invention;

the meanings of the marks in the above figures are as follows: 1-foundation; 2-C20 concrete pad; 3-bending the steel pipe; 4-bowl-fastener type scaffold; 5-wood purlin; 6-a wing plate template; 7-box girder bottom template; 8-internal mold; 9-abutment; 10-pier stud; 11-prepressing balance weight.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "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, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.