CN108098979A - A kind of PK sections concrete box girder precast segment template - Google Patents

Abstract

The invention provides a prefabricated formwork for a PK section concrete box girder segment, including a side form assembly, a bottom form assembly, an end form assembly and a sliding assembly; wherein, the side form assembly includes a side form support and a The side formwork supported by the formwork support; the movable formwork is arranged on the side formwork support, and the hydraulic jacking rod for supporting the ground is also provided at the lower end of the side formwork support; the bottom formwork assembly includes the bottom formwork support beam, and the bottom formwork support beam The bottom formwork is provided at the upper end, and the bottom formwork support rod is provided at the lower end; the end formwork assembly includes a fixed end formwork and a movable end formwork provided at both ends of the corresponding box girder segment; the sliding assembly includes a walking bracket arranged at the lower end of the bottom formwork, The lower end of the walking bracket is provided with a sliding shoe. The invention is provided with sliding components, which can greatly increase the beam moving speed, and is suitable for the "short-line method" prefabrication construction of large-tonnage PK section concrete box girder segments, which improves the production efficiency of mixed girder cable-stayed bridges and shortens the construction period. It also helps to save construction costs.

Description

A Prefabricated Formwork for PK Section Concrete Box Girder Segments

technical field

The invention belongs to the technical field of concrete beam prefabrication construction, and in particular relates to a segmental prefabricated template of a PK section concrete box girder.

Background technique

Most of the traditional PK section concrete box girders of cable-stayed bridges adopt the cast-in-place method of brackets, so the requirements for formwork technology are relatively simple. However, due to the characteristics of the PK section concrete box girder structure, the efficiency of formwork assembly, disassembly, and beam removal is low during the prefabrication process using the "short-line method" on the ground. At present, this technology is not yet mature in my country. How to adapt to the "short-line method" construction technology, save construction costs, and significantly improve the production efficiency of composite girder cable-stayed bridges on the premise of ensuring project quality is an urgent problem to be solved.

Contents of the invention

In view of this, the present invention aims to overcome the above-mentioned defects in the prior art, and proposes a prefabricated formwork for the PK section concrete box girder segment.

In order to achieve the above object, the technical solution created by the present invention is achieved in this way:

A PK section concrete box girder section prefabricated formwork, including side formwork components, bottom formwork components, end formwork components and sliding components;

The side form assembly includes a side form support and a side form supported by the side form support; a movable form is provided on the side form support, and a hydraulic top brace for ground support is also provided at the lower end of the side form support;

The bottom form assembly includes a bottom form support beam, a bottom formwork is provided at the upper end of the bottom form support beam, and a bottom form support bar is provided at the lower end;

The end formwork assembly includes a fixed end formwork and a movable end formwork provided at both ends of the corresponding box girder section, the movable end formwork is fixedly connected to the bottom formwork by bolts, and the fixed end formwork is installed on the fixed bracket; the movable end formwork The upper part of the formwork is connected with the upper part of the fixed end formwork through the upper pair of tension steel rods;

The sliding component includes a walking bracket arranged at the lower end of the bottom template, and a sliding shoe is arranged at the lower end of the walking bracket.

Further, the fixing bracket is provided with a reinforcing flange for connecting with the fixing template.

Further, the lower end of the fixed bracket is provided with anchoring steel bars extending below the ground.

Further, the movable form is a movable angle formwork installed on the side form support through an adjustable support rod, or a movable opening plate directly installed on the side form support.

Further, a jack capable of adjusting the height of the bottom template is provided on the walking support.

Further, a limit rail is provided in the middle of the sliding shoe.

Further, a lower pair of tension steel rods is provided between the bottom formwork and the side formwork support.

Compared with the prior art, the present invention has the following advantages:

The prefabricated formwork provided by the invention is easy to install and easy to disassemble. Since the sliding assembly is provided, the beam moving speed is greatly improved, and it is especially suitable for the "short-line method" prefabricated construction of large-tonnage PK section concrete box girder segments. This prefabricated formwork It can ensure the pouring line of the PK section box girder, guarantee the structural quality, improve the production efficiency of the mixed girder cable-stayed bridge, indirectly shorten the construction period, and help save construction costs at the same time.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the structural representation that the present invention creates;

Fig. 2 is the structural representation when the present invention creates and adopts movable opening plate;

Fig. 3 is a right side view of Fig. 1 .

Explanation of reference signs:

1-side mold assembly; 2-bottom mold assembly; 3-end mold assembly; 4-sliding assembly; 5-side mold bracket; 6-side formwork; Beam; 9-bottom formwork; 10-bottom formwork support rod; 11-fixed end formwork; 12-movable end formwork; 13-fixed bracket; -Reinforced flange; 18-Double pull steel rod; 19-Active angle formwork; 20-Active flap plate; 21-Anchor steel bar; 22-Jack; 23-Adjustable support rod.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention Creation and simplification of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

The invention will be described in detail below with reference to the accompanying drawings and examples.

A PK section concrete box girder section prefabricated formwork, as shown in Figures 1 to 3, includes a side formwork assembly 1, a bottom formwork assembly 2, an end formwork assembly 3 and a sliding assembly 4;

Side form assembly 1, comprises side form support 5 and the side template 6 that is supported by side form support, is provided with movable mold on side form support, simultaneously, in order to improve the stability of side form support, in side form support lower end also There are several hydraulic top struts 7 for supporting the ground, which form multi-point support through the hydraulic top struts. Specifically, the hydraulic top struts can use hydraulic cylinders to support the side form brackets with hydraulic pressure;

The bottom mold assembly 2 includes a bottom mold support beam 8, a bottom formwork 9 is provided at the upper end of the bottom mold support beam 8, and a bottom mold support rod 10 is provided at the lower end;

The end formwork assembly 3 includes a fixed end formwork 11 and a movable end formwork 12 arranged at both ends of the corresponding box girder section, the movable end formwork 12 is fixedly connected to the bottom formwork 9 by bolts, and the fixed end formwork 11 is installed on the fixed bracket 13; the upper part of the movable end formwork is connected with the upper part of the fixed end formwork through the upper pair of tension steel rods 14;

The sliding assembly 4 includes a walking bracket 15 arranged at the lower end of the bottom template 9, and a sliding shoe 16 is arranged at the lower end of the walking bracket. After the side formwork, bottom formwork and movable end formwork are removed, the sliding shoe can be used to pull and move the beam, which saves time and effort and improves work efficiency.

The upper part of the movable end formwork is connected with the upper part of the fixed end formwork by the upper pair of pull steel rods 14, which can be easily connected and unfixed, and the movable end formwork is easy to assemble and disassemble.

Specifically, the side formwork can be obliquely installed on the side support, and its inclination matches the beam segment to be prefabricated; there is a movable mold on the side formwork support, which can match the corresponding beam segment according to the specific structural form of the beam segment. The movable and adjustable formwork ensures that the prefabricated components meet the design requirements.

The above-mentioned fixing bracket is provided with a reinforcing flange 17 for connecting with the fixing template, and the fixing template can be firmly installed on the fixing bracket through the reinforcing flange.

The lower end of the fixed bracket is provided with an anchoring steel bar 21 extending below the ground, which effectively ensures the stability of the fixed bracket structure and is not prone to overturning under load. The fixed bracket can adopt a truss structure.

The above-mentioned movable form can be a movable angle template 19 installed by an adjustable support rod 23 on the side form support, or a movable opening plate 20 directly installed on the side form support. The adjustable support rod can adjust the length and rotation direction according to the needs, so as to ensure that the movable mold can be adjusted to the designed position.

The movable corner formwork is generally arranged with an obliquely downward structure, and the movable opening plate is generally arranged with an obliquely upward structure, which assists in positioning and forming the corner position of the beam segment. Both the movable corner formwork and the movable flap are designed for the structures on both sides of the beam stage. The specific structure of the slab can be determined according to the actual working conditions, and there is no specific limitation here.

The above-mentioned walking support is provided with a jack 22 capable of adjusting the height of the bottom formwork, which can properly adjust the height of the bottom formwork according to needs, or be used for leveling operations of the bottom formwork, which is easy to operate and very practical. It can also be used to lift box girder sections that slide on skid shoes.

The middle part of the above-mentioned sliding shoe is provided with a limit rail, which can avoid the deviation of the beam when sliding on the sliding shoe. Between the above-mentioned bottom formwork and the side formwork support, there are lower paired steel rods 18, which ensure the stability of the overall structure of the prefabricated formwork proposed by the present invention to the greatest extent.

Usually, the side form bracket and the side form are connected by bolts. The hydraulic top support bar and the side form support, as well as the adjustable support bar and the side form support are all welded and fixed.

The prefabricated formwork provided by the invention is easy to install and easy to disassemble. Since the sliding assembly is provided, the beam moving speed is greatly improved, and it is especially suitable for the "short-line method" prefabricated construction of large-tonnage PK section concrete box girder segments. This prefabricated formwork It can ensure the pouring line of the PK section box girder, guarantee the structural quality, improve the production efficiency of the mixed girder cable-stayed bridge, indirectly shorten the construction period, and help save construction costs at the same time.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the Within the scope of protection of the present invention.

Claims (7)

1. A PK section concrete box girder section prefabricated formwork, is characterized in that: comprise side form assembly, bottom form assembly, end form assembly and slip assembly; The side form assembly includes a side form support and a side form supported by the side form support; a movable form is provided on the side form support, and a hydraulic top brace for ground support is also provided at the lower end of the side form support; The bottom form assembly includes a bottom form support beam, a bottom formwork is provided at the upper end of the bottom form support beam, and a bottom form support bar is provided at the lower end; The end formwork assembly includes a fixed end formwork and a movable end formwork provided at both ends of the corresponding box girder section, the movable end formwork is fixedly connected to the bottom formwork by bolts, and the fixed end formwork is installed on the fixed bracket; the movable end formwork The upper part of the formwork is connected with the upper part of the fixed end formwork through the upper pair of tension steel rods; The sliding assembly includes a walking bracket arranged at the lower end of the bottom template, and a sliding shoe is arranged at the lower end of the walking bracket. 2. A PK section concrete box girder segment prefabricated formwork according to claim 1, characterized in that: said fixing bracket is provided with a reinforcement flange for connecting with said fixed formwork. 3. A PK section concrete box girder segmental prefabricated formwork according to claim 1, characterized in that: the lower end of the fixed bracket is provided with an anchoring steel bar extending below the ground. 4. A kind of PK cross-section concrete box girder section prefabricated formwork according to claim 1, it is characterized in that: described movable formwork is the movable angle formwork installed by adjustable support bar on the sideform support, or on the sideform The movable opening panel installed directly on the bracket. 5. A PK section concrete box girder section prefabricated formwork according to claim 1, characterized in that: the walking support is provided with a jack capable of adjusting the height of the bottom formwork. 6. A PK section concrete box girder segment prefabricated formwork according to claim 1, characterized in that: the middle part of the sliding shoe is provided with a limit rail. 7. A PK cross-section concrete box girder segment prefabricated formwork according to claim 1, characterized in that: the bottom formwork and the side formwork support are provided with lower tension steel rods.