Cast-in-situ box girder edge protection structure and construction method

Abstract

The application discloses a cast-in-situ box girder edge protection structure and a construction method, which comprises a bearing beam and a cantilever formwork, the cantilever formwork is located on the two sides of the bearing beam, a plurality of vertical supporting rods and inclined supporting rods are arranged between the cantilever formwork and the bearing beam, a guardrail structure is arranged on the cantilever formwork, the guardrail structure comprises a flange formwork connected with the cantilever formwork, a plurality of guardrails are arranged on the flange formwork, and a connecting square wood is arranged every several guardrails. The cantilever structure support is fully utilized as a bearing structure of the guardrail, and is combined with the cast-in-situ box girder construction, the guardrail protection structure is combined with the overall construction of the cast-in-situ box girder, and is integrated. The cantilever support guardrail structure is only utilized on the top surface of the cast-in-situ box girder. After the guardrail is impacted, the structure is mutually offset, there is no horizontal force on the lower support, and the safety is better.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridges, in particular to a cast-in-place box girder edge protection structure. BACKGROUND

[0002] The cast-in-place box girder is a common design form in bridge construction at present. Due to the characteristics of high-altitude operation, complex structure form, small bending and variable diameter of the cast-in-place box girder, high-altitude operation has high risk, and safety protection needs to be done at the edge. The conventional support guardrail is to set a separate support outside the full support, and after being connected, the separate support serves as the protection support of the cast-in-place girder. The single-row protection support is connected with the main full support through horizontal members. The shortcomings of this method are as follows: (1) the separate protection support consumes more materials with the increase of the design height of the girder body, and the economy is poor; (2) the impact force on the upper part of the guardrail is transmitted to the full support in the horizontal direction, which is easy to cause safety accidents. SUMMARY

[0003] The main purpose of the present application is to provide a cast-in-place box girder edge protection structure and construction method, which is convenient to install, saves materials and ensures the construction safety of the high-altitude operation personnel of the cast-in-place box girder.

[0004] The main purpose of the present application is to provide a cast-in-place box girder edge protection structure, which comprises a bearing beam and a cantilever formwork. The cantilever formwork is located on both sides of the bearing beam. A plurality of vertical support rods and inclined support rods are arranged between the cantilever formwork and the bearing beam. A guardrail structure is arranged on the cantilever formwork. The guardrail structure comprises a flange formwork connected with the cantilever formwork, and a plurality of guardrails arranged on the flange formwork. A connecting square wood is arranged every several guardrails.

[0005] Preferably, the cantilever formwork is provided with an elongated end, and the length of the elongated end is 45-55 mm.

[0006] Preferably, a support square wood is arranged between the guardrail and the elongated end of the cantilever formwork, and the support square wood, the guardrail and the elongated end form a triangular shape.

[0007] Preferably, the guardrail, the support square wood and the elongated end are connected by a nail.

[0008] Preferably, the cantilever formwork is in the shape of an inverted "L".

[0009] Preferably, the inclination angle of the inclined support rod is 30-60°.

[0010] Preferably, a reinforcing plate is arranged at the connection between the inclined support rod and the bearing beam.

[0011] Preferably, the size of the guardrail is 1.5 m in length and 1.2 m in width.

[0012] Preferably, transverse connecting rods are arranged between the vertical support rods.

[0013] Preferably, the connecting square timber and the railing are connected by a railing buckle.

[0014] Preferably, a pair of steel wire ropes are arranged on the top of the two side flange forms.

[0015] The application also provides a construction method of a cast-in-place box girder edge protection structure, comprising the following steps:

[0016] S1, installing a cantilever form and a flange form, the support square timber needs to be extended by 40-60cm to the elongated end of the cantilever form, so as to provide space for the support square timber in the later period, the height of the cantilever form is consistent with the thickness of the flange plate;

[0017] S2, a connecting square timber is arranged outside the railing buckle and is close to the railing buckle, and the line shape is adjusted during the installation process, so that the connecting square timber forms a curved type, and the connecting square timber is kept as beautiful as possible on the basis of meeting the design requirements;

[0018] S3, a support square timber is arranged at the connecting square timber of the protective railing, so that the support square timber is connected with the bearing square timber of the cantilever form, and the three form a triangular stable system, and the connecting square timber and the support square timber are connected closely by shooting nails;

[0019] S4, a pair of steel wire ropes are arranged on the top of the two side flange forms of the box girder, the height of the steel wire ropes is equal to the elevation of the top of the beam, and the steel wire ropes are adjusted according to the transverse slope. The steel wire ropes are arranged at intervals, and the steel wire ropes have two functions: one is to ensure the stability of the two side railings, and the other is to serve as a reference surface for pouring the bridge deck, and the elevation of the top surface is controlled based on the steel wire ropes.

[0020] Preferably, in step S1, the support square timber needs to be extended by 50cm to the elongated end of the cantilever form, and in step S2, the specification of the railing is 1.2m*1.5m.

[0021] The application has the beneficial effects that the cantilever form support is fully utilized as a bearing structure of the railing, and the railing structure is combined with the cast-in-place box girder construction, so that the railing structure is combined with the cast-in-place box girder as a whole. The cantilever form support is used to support the protection structure system on the top of the cast-in-place box girder, and the protection structure system is simple, applicable, convenient and economical. The railing can offset the impact through the structure of the railing, and the lower support is not affected by the horizontal force, so that the safety is better. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, objects and advantages of this application become more apparent. The illustrative embodiment drawings of this application and the description thereof are used to explain this application, and do not constitute an improper limitation on this application. In the drawings:

[0023] Fig. 1 Overall structure of the protective structure;

[0024] Fig. 2 Front view of the guardrail structure;

[0025] Fig. 3 Side view of the guardrail structure.

[0026] 1 - load-bearing beam; 2 - diagonal support pole; 3 - diagonal support pole; 4 - vertical support pole; 5 - cantilever formwork; 6 - support square timber; 7 - guardrail structure; 9 - lower support; 10 - transverse connecting pole; 11 - transverse connecting pole; 12 - reinforcing plate; 13 - tensioned steel wire rope; 71 - connecting square timber; 72 - railing; 73 - railing buckle; 74 - flange formwork; 75 - nail gun. DETAILED DESCRIPTION

[0027] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0030] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0031] In addition, the term "multiple" should mean two or more.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] Example 1

[0034] Please see Figs. 1-3 This application provides a protective structure for the edge of a cast-in-place box girder, including a load-bearing beam 1 and a cantilever formwork 5. The cantilever formwork 5 is located on both sides of the load-bearing beam 1. Several vertical support rods 4 and diagonal support rods 2 are provided between the cantilever formwork 5 and the load-bearing beam 1. A guardrail structure 7 is provided on the cantilever formwork 5. The guardrail structure 7 includes a flange formwork 74 connected to the cantilever formwork 5, and several railings 72 are provided on the flange formwork 74. A connecting square timber 71 is provided every few railings 72. A lower support 9 is provided at the lower end of the load-bearing beam 1, and the lower support 9 is connected by a transverse connecting rod 10.

[0035] In this embodiment, the cantilever template 5 is provided with an extended end, the length of which is 45-55mm.

[0036] In this embodiment, a supporting square timber 6 is provided between the railing 72 and the extended end of the cantilever template 5, and the supporting square timber 6, the railing 72, and the extended end form a triangular shape.

[0037] In this embodiment, the railing 72, the supporting timber 6, and the extended end are connected by nails.

[0038] In this embodiment, the cantilever template 5 is an inverted "L" shape.

[0039] In this embodiment, the inclination angle of the inclined support rod 2 and the inclined support rod 3 is 30-60°.

[0040] In this embodiment, a reinforcing plate 12 is provided at the connection between the inclined support rod 2, the inclined support rod 3 and the load-bearing beam 1.

[0041] In this embodiment, the railing 72 has dimensions of 1.5m in length and 1.2m in width.

[0042] In this embodiment, a transverse connecting rod 11 is provided between the vertical support rods 4.

[0043] In this embodiment, the connecting timber 71 and the railing 72 are connected by railing buckles 73.

[0044] In this embodiment, tie steel wire ropes 13 are provided on the top of the two side flange templates 74.

[0045] This application also provides a construction method for the edge protection structure of a cast-in-place box girder, including the following steps:

[0046] S1. Install the cantilever formwork and flange formwork. The supporting timber needs to extend 40-60cm beyond the extended end of the cantilever formwork to provide space for the supporting timber later. The height of the cantilever formwork should be consistent with the thickness of the flange plate.

[0047] S2, Connecting square timber is set on the outside of the railing buckle and attached tightly. During the installation process, pay attention to adjusting the line shape to form a curve, and try to maintain the aesthetics while meeting the design requirements.

[0048] S3, set up supporting timber at the connecting timber of the guardrail, connect it with the load-bearing timber of the cantilever formwork, and make the three form a triangular stable system. The connecting timber and the supporting timber are tightly connected by nails.

[0049] S4. Tie steel wire ropes are installed at the top of the formwork on both sides of the box girder. The elevation of the steel wire ropes is equal to the elevation of the top of the girder, and they are adjusted according to the cross slope. Steel wire ropes are installed at regular intervals. The steel wire ropes serve two purposes: first, to ensure the stability of the guardrails on both sides; and second, to serve as a reference surface for the bridge deck pouring, controlling the top elevation based on the steel wire ropes.

[0050] In this embodiment, in step S1, the supporting timber needs to extend 50cm beyond the extended end of the cantilever template, and in step S2, the railing has a specification of 1.2m*1.5m.

[0051] This application aims to ensure construction safety, aesthetically pleasing alignment, and improved installation efficiency by installing simple railings along the edges of cast-in-place box girders, forming a unified whole with the cantilever formwork and guardrail structure, and using tie wire ropes as an auxiliary measure.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A protective structure for the edge of a cast-in-place box girder, characterized in that, The system includes a load-bearing beam and a cantilever formwork. The cantilever formwork is located on both sides of the load-bearing beam. Several vertical and diagonal support rods are provided between the cantilever formwork and the load-bearing beam. A guardrail structure is provided on the cantilever formwork. The guardrail structure includes a flange formwork connected to the cantilever formwork, and several railings are provided on the flange formwork. A connecting square timber is provided every few railings. The cantilever formwork is "L"-shaped with the opening facing downwards. The cantilever formwork has an extended end with a length of 45-55mm. A supporting square timber is provided between the railing and the extended end of the cantilever formwork. The supporting square timber, the railing, and the extended end form a triangular shape.

2. The edge protection structure for cast-in-place box girder as described in claim 1, characterized in that, The railing, supporting timber, and extended ends are connected by nails.

3. The edge protection structure for cast-in-place box girder as described in claim 1, characterized in that, The inclination angle of the inclined support rod is 30-60°.

4. The edge protection structure for cast-in-place box girders as described in claim 3, characterized in that, A reinforcing plate is provided at the connection between the inclined support rod and the load-bearing beam, and a transverse connecting rod is provided between the vertical support rods.

5. The edge protection structure for cast-in-place box girder as described in claim 1, characterized in that, The connecting timber and the railing are connected by railing clips, and pull steel wire ropes are installed at the top of the two side flange templates.

6. A construction method for an edge protection structure of a cast-in-place box girder, characterized in that, Applied to the edge protection structure of the cast-in-place box girder as described in claim 1, the method includes the following steps: S1. Install the cantilever formwork and flange formwork. The supporting timber needs to extend 40-60cm beyond the extended end of the cantilever formwork to provide space for the supporting timber later. The height of the cantilever formwork should be consistent with the thickness of the flange formwork. S2, Connecting square timber is set on the outside of the railing buckle and attached tightly. During the installation process, the alignment is adjusted to form a curve. S3, set up supporting timber at the connecting timber of the guardrail, connect it with the load-bearing timber of the cantilever formwork, and make the three form a triangular stable system. The connecting timber and the supporting timber are tightly connected by nails. S4. Tie wire ropes are installed at the top of the formwork on both sides of the box girder. The elevation of the wire ropes is equal to the elevation of the top of the beam. The wire ropes are adjusted according to the cross slope and are installed at certain intervals.

7. The construction method of the edge protection structure for cast-in-place box girder as described in claim 6, characterized in that, In step S1, the supporting timber needs to extend 50cm beyond the extended end of the cantilever formwork. In step S2, the railing has a specification of 1.2m*1.5m.

Images