JP3243397U - End formwork and formwork systems for prefabricated prestressed box girders - Google Patents

Abstract

An end formwork and formwork system for a prefabricated prestressed box girder that reduces construction costs and improves construction efficiency compared to temporary installation of a tension tunnel. The end formwork has a reserved hole position 11 for attaching an inner formwork in the middle part of the formwork body 10, and at least two protrusions 12 are further installed on the outer surface of the formwork body. Two protrusions are located on both sides of the outer surface of the formwork body, respectively, and tension tunnels 120 are opened for passing the prestressed reinforcing bars over the protrusions. pierce in the vertical direction. A projection is installed on the formwork body of the end formwork, and a tension tunnel is installed on the projection. [Selection drawing] Fig. 1

Description

The present application relates to the technical field of box girder formwork, and in particular to end formwork and formwork systems for prefabricated prestressed box girders.

During the prestressing box girder production, the end formwork is generally divided into two parts. , and the strength is low and it is easy to break; Prestressed box girders all need to install prestressed rebar structures during construction, and conventional end formwork needs to be temporarily added because the corresponding tunnels are not installed. Not only can it not be met, but it also increases construction costs.

The present application provides a prefabricated prestressed box girder end formwork and formwork system to meet the design requirements of installing end formwork tension tunnels, reduce construction costs, and improve construction efficiency. Let

SUMMARY OF THE INVENTION According to a first aspect of the present application, the present application provides an end formwork for a prefabricated prestressed box girder, the end formwork comprising a formwork body, and in the middle of said formwork body: A reserved hole position for installing the inner formwork is provided, and at least two protrusions are further installed on the outer surface of the formwork body, and the at least two protrusions are respectively located on both sides of the outer surface of the formwork body. , a tension tunnel is opened for the prestressed reinforcing bar to pass over the projection, and both the tension tunnel and the reserved hole position pass through the formwork body in the thickness direction.

Further comprising at least two connection assemblies, said at least two connection assemblies being used to removably connect opposite sides of said formwork body to an external structure.

Four of the connecting assemblies are installed, and two of the connecting assemblies detachably connect opposite sides of the formwork body to an external structure.

The connecting assembly includes a positioning sleeve, an ear plate, and a screw, the ear plate being rotatably mounted on the outer wall of the positioning sleeve, and a female threaded hole matching the screw being provided inside the positioning sleeve. , the screw is threaded into the female threaded hole, a connecting threaded hole is installed on the form body, one end of the screw is threaded into the connecting threaded hole, and the ear plate removes the outer structure connect as possible.

A connection hole is provided on the ear plate, and the connection hole is used to detachably connect with an external structure.

A plurality of reinforcing plates are further installed on the inner surface of the form body, and the plurality of reinforcing plates are installed on the side and middle portions of the form body along the lateral direction and/or the longitudinal direction.
A comb-like structure is installed on the bottom of the formwork body, and the comb-like structure is used to extend the exposed rebar.

The formwork body includes a top plate, a bottom plate and two side plates, wherein the top plate and the bottom plate are connected between the two side plates, the top plate is located above the bottom plate, and the top plate, the bottom plate , two side plates surround the position of the reserved hole, each of the two side plates is provided with two protrusions, the bottom plate is provided with the comb structure, the top plate, the bottom plate, Both side plates are located in the same plane.

According to a second aspect of the present application, the present application provides a formwork system for a prefabricated prestressed box girder, the system comprising an end formwork for said prefabricated prestressed box girder.

According to the end formwork and formwork system of the prefabricated prestressed box girder according to the present application, the method of installing a projection on the formwork body of the end formwork and installing a tension tunnel on the projection is conventionally Compared to the method of temporarily installing a tension tunnel in , it can not only meet the design requirements, but also reduce construction costs and improve construction efficiency.

1 is a perspective view of an end formwork of a prefabricated prestressed box girder according to the present application; FIG. 1 is a front view of an end formwork of a prefabricated prestressed box girder according to the present application; FIG. FIG. 4 is a rear view of the end formwork of a prefabricated prestressed box girder according to the present application; FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3; 4 is a cross-sectional view taken along the line BB in FIG. 3; FIG. 1 is a schematic front view of an end formwork installation of a prefabricated prestressed box girder according to the present application; FIG. FIG. 3 is an end formwork installation schematic plan view of a prefabricated prestressed box girder according to the present application; FIG. 4 is a perspective view of a connection assembly in a prefabricated prestressed box girder according to the present application;

<Example 1>
1 to 5, the end formwork of the prefabricated prestressed box girder according to this embodiment includes a formwork body 10, which is made of steel. , a reserved hole position 11 is opened in the middle part of the formwork body 10, and this reserved hole position 11 is used to attach the inner formwork, and this reserved hole position 11 is such that the formwork body 10 has a hollow structure. be formed to At least two protrusions 12 are further installed on the outer surface of the formwork body 10 , and each protrusion 12 is located on both sides of the outer surface of the formwork body 10 respectively. A tension tunnel 120 is opened on each projection 12, and this tension tunnel 120 is used to pass the prestressed rebar. It should be noted that both the tension tunnel 120 and the reserved hole location 11 pass through the form body 10 in the thickness direction.

In this embodiment, the method of installing the projection 12 on the formwork main body of the end mold and installing the tension tunnel 120 on the projection 12 reduces the design requirements compared to the conventional method of temporarily installing the tension tunnel. It not only satisfies the requirements, but also reduces construction costs and improves construction efficiency.

6-8, in one embodiment, the prefabricated prestressed box girder end formwork according to the present application further includes at least two connection assemblies 20, each connection assembly 20 connecting the formwork body 10 is used to removably connect opposite sides of the to an external structure 100, where the external structure 100 is a side formwork for installing a prefabricated prestressed box girder. The detachable connection via the connection assembly 20 allows the end forms to be removed after the fabrication of the prefabricated prestressed box girder is completed to improve the circulation rate of the end forms.

In one embodiment, four connecting assemblies 20 are provided, two connecting assemblies 20 detachably connecting opposite sides of the formwork body 10 to the outer structure 100 .

In the preferred embodiment, the formwork body 10 is approximately rectangular in shape, and four connection assemblies 20 each connect a square of the rectangular-shaped formwork body 10 to the external structure.

Referring to FIG. 8 , coupling assembly 20 includes positioning sleeve 21 , ear plate 22 and screw 23 . The ear plate 22 is rotatably mounted on the outer wall of the positioning sleeve 21, and a female threaded hole is provided inside the positioning sleeve 21 to match the screw 23, and the screw 23 is screwed into the female threaded hole, as shown in FIGS. 3, a connecting screw hole 13 is installed on the form body 10, one end of the screw 23 is screwed into the connecting screw hole 13, and the edge plate 22 is shown in FIGS. , removably connect the outer structure 100 .

In this embodiment, a connecting hole 220 is provided on the ear plate 22 , and this connecting hole 220 is used to detachably connect with the external structure 100 . More specifically, a corresponding bolt hole is installed on the outer structure, and a fastening bolt is inserted into the connecting hole 220 and screwed into the bolt hole to detachably connect the ear plate 22 and the outer structure 100. .

As shown in FIGS. 1 and 3, a plurality of reinforcing plates 14 are further installed on the inner surface of the formwork body 10, and each reinforcing plate 14 extends laterally and/or longitudinally along the side of the formwork body 10. Installed on the sides and in the middle. In other words, some of the plurality of reinforcing plates 14 are installed along the side edges of the form body 10 , and the other number of reinforcing plates 14 are installed in the middle of the form body 10 . may be installed.

A comb-like structure 15 is installed on the bottom of the formwork body 10, and this comb-like structure 15 is used to extend the exposed reinforcing bars.

With continued reference to FIG. 1, the formwork body 10 includes a top plate 16, a bottom plate 17 and two side plates 18, wherein the top plate 16 and the bottom plate 17 are connected between the two side plates 18 and The top plate 16 is positioned above the bottom plate 17, and the top plate 16, the bottom plate 17, and the two side plates 18 surround the reserved hole position 11, and each of the two side plates 18 has two projections 12 respectively. , the aforementioned comb-like structure 15 is installed on the bottom plate 17, and the top plate 16, the bottom plate 17 and the two side plates 18 are all located in the same plane, thereby forming the present form body.

<Example 2>
This example provides a prefabricated prestressed box girder formwork system comprising the end formwork of the prefabricated prestressed box girder according to example 1, all of which end formwork The structure and features of have already been described in detail in the above embodiments and will not be further described here.

In summary, for the end formwork and formwork system of the prefabricated prestressed box girder according to the present application, the method of setting the projection on the formwork body of the end formwork and setting the tension tunnel on the projection Compared to the conventional method of temporarily installing a tension tunnel, this method not only satisfies the design requirements, but also reduces the construction cost and improves the construction efficiency.

10 form body 11 reserved hole position 12 protrusion 120 tension tunnel

Claims (8)

An end formwork for a prefabricated prestressed box girder, comprising a formwork body, wherein a reserved hole position for mounting an inner formwork is opened in the middle part of the formwork body, and on the outer surface of the formwork body At least two projections are further provided, the at least two projections are respectively located on both sides of the outer surface of the formwork body, and tension tunnels are opened over the projections for passing the prestressed reinforcing bars, and the tension tunnels and the reserved hole positions penetrate through the form body in the thickness direction thereof. 2. The method of claim 1, further comprising at least two connection assemblies, said at least two connection assemblies being used to removably connect opposite sides of said formwork body to an external structure. End formwork for prefabricated prestressed box girders. 3. The prefabricated prefabricated prefabricated structure according to claim 2, characterized in that four connecting assemblies are installed, and two connecting assemblies detachably connect opposite sides of the formwork body with an external structure. End formwork for stress box girders. The connecting assembly includes a positioning sleeve, an ear plate, and a screw, the ear plate being rotatably mounted on the outer wall of the positioning sleeve, and a female threaded hole matching the screw being provided inside the positioning sleeve. , the screw is threaded into the female threaded hole, a connecting threaded hole is installed on the form body, one end of the screw is threaded into the connecting threaded hole, and the ear plate removes the outer structure 4. The end formwork of prefabricated prestressed box girder according to claim 3, characterized in that it is connectable. The end mold of prefabricated prestressed box girder according to claim 4, characterized in that a connection hole is installed on the ear plate, and the connection hole is used for detachable connection with an external structure. frame. A plurality of reinforcing plates are further installed on the inner surface of the form body, and the plurality of reinforcing plates are installed in the lateral and/or longitudinal direction along the side and middle portions of the form body. The end formwork of a prefabricated prestressed box girder according to claim 1. The prefabricated prestressed box girder according to claim 1, characterized in that a comb-tooth structure is installed on the bottom of the formwork body, and the comb-tooth structure is used to extend exposed rebars. end formwork. The formwork body includes a top plate, a bottom plate and two side plates, wherein the top plate and the bottom plate are connected between the two side plates, the top plate is located above the bottom plate, and the top plate, the bottom plate , two side plates surround the position of the reserved hole, each of the two side plates is provided with two protrusions, the bottom plate is provided with the comb structure, the top plate, the bottom plate, 8. The end formwork of prefabricated prestressed box girder according to claim 7, characterized in that the two side plates are both located in the same plane.