CN104179125B - A balance beam device for supporting the main beam of the mobile formwork - Google Patents

Abstract

The invention relates to a balance beam device for supporting a main beam of a mobile formwork, comprising a main beam box installed on a push trolley, and a main beam box support frame vertically arranged in the main beam box and installed on the top of the main beam box The lower end of the main girder box support frame is connected to the hinge support mechanism, and the lower end of the hinge support mechanism is connected to the top of the balance beam to form a balance beam type support system; two lifting cylinders are installed between the bottom of the balance beam and the propulsion trolley. In the present invention, a balanced beam type support system is formed by connecting the hinged support structure on the balance beam, and the balance beam type support system is arranged at the supporting positions of the front and rear piers of the main beam to form a simply supported beam mechanical model of the main beam of the mobile formwork, When pouring concrete, it can ensure that the entire load is evenly transmitted to the two lifting cylinders through the balance beam support system, so that the corbel beam under the push trolley is evenly stressed, preventing local overload and partial load of the corbel beam, and effectively ensuring equipment safety.

Description

A balance beam device for supporting the main beam of the mobile formwork

technical field

The invention belongs to the technical field of bridge construction, and in particular relates to a balance beam device for supporting a main girder of a mobile formwork.

Background technique

The mobile formwork is a kind of construction equipment with self-contained formwork, using caps or pier columns as support, and pouring bridges on site. As an advanced construction equipment, due to the advantages of good construction quality, easy operation and high efficiency, mobile formwork has been widely used in the continuous beam construction of highways, road bridges and railway bridges.

The running of the mobile formwork is realized by pushing the trolley, and the longitudinal displacement oil cylinder and the lateral displacement oil cylinder are installed on the trolley to realize the vertical movement, lateral movement and lifting of the mobile formwork. The propulsion trolley of the existing mobile formwork is installed under the lower wing of the main beam, and the trolley seat is installed above the upper wing of the corbel beam. The conventional propulsion trolley device of the mobile formwork has the following disadvantages:

1. The trolley is equipped with a lifting cylinder, a vertical movement cylinder and a transverse movement cylinder. When the trolley is installed between the main beam and the corbel with a conventional mobile formwork, the height of the trolley must be greater than the height of the oil cylinder to carry out the main beam. Bearing, the overall equipment height of the mobile formwork is high, occupying the clearance height under the bridge, and there are strict requirements on the pier height during bridge construction, so the construction of the mobile formwork on short pier bridges is limited.

2. The lifting cylinder of the conventional mobile formwork trolley is located under the lower wing of the main beam, and its piston rod extends out to directly carry the load on the main beam when pouring concrete. Balanced, only one lifting cylinder can be installed on a trolley, so the bearing capacity of a single lifting cylinder is huge, which improves the reliability requirements of the hydraulic system.

3. The structure of the trolley device is complex, and the overall weight is heavy.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art and provide a balance beam device for supporting the main beam of a mobile formwork with uniform force, safe equipment and simple structure.

Technical scheme of the present invention is:

It includes the main beam box installed on the propulsion trolley, and the main beam box support frame vertically arranged in the main beam box and installed on the top of the main beam box; the lower end of the main beam box support frame is connected to the hinge support mechanism, and the hinge support mechanism The lower end of the balance beam is connected to the top of the balance beam to form a balance beam support system; two lifting cylinders parallel to the main beam are installed between the bottom of the balance beam and the propulsion trolley; The balanced beam support system forms a simply supported beam mechanical model of the main beam of the mobile formwork.

The bottom of the main beam box is equipped with a main beam lower floor, and a through hole is opened at the position corresponding to the lower floor of the main beam and the lifting cylinder to allow the piston rod of the lifting cylinder to pass through; the two lifting cylinders are both inverted , its base is connected to both ends of the bottom of the balance beam, and its piston rod is supported on the propulsion trolley through the through hole on the bottom plate of the main beam.

The hinge support mechanism includes a first hinge support and a second hinge support, the upper end of the first hinge support is connected to the main girder box support frame, and the lower end of the second hinge support is connected to the balance beam.

The first hinged support and the second hinged support are hinged through pin shafts.

The main girder box supporting frame, the first hinge support, the second hinge support, the balance beam and the lifting oil cylinder are respectively fixedly connected by bolt groups.

The lifting cylinder is a lifting hydraulic cylinder.

The main girder box supporting frame is welded by several steel plates.

Compared with the prior art, the present invention has the following beneficial technical effects:

In the present invention, a balanced beam type support system is formed by connecting the hinged support structure on the balance beam, and the balance beam type support system is arranged at the supporting positions of the front and rear bridge piers of the main beam to form a simply supported beam mechanical model of the main beam of the mobile formwork, The equipment is simple. When pouring concrete, it can ensure that the entire load is evenly transmitted to the two lifting cylinders through the balance beam support system, so that the corbel beam under the push trolley is evenly stressed, preventing local overload and partial load of the corbel beam, and effectively ensuring the equipment. Safety.

Further, in the balance beam support system of the present invention, the balance beam is arranged in the main beam box, and the piston rods of the two lifting cylinders can be supported on the propulsion trolley through the holes on the bottom plate of the main beam. When the mobile formwork is pouring concrete, The piston rod of the lifting cylinder is stretched out and supported on the propulsion trolley to raise the height of the main girder to reach the bridge pouring position. Separation, at this time the bottom plate of the main girder is directly supported on the propelling trolley. In the present invention, the lifting cylinder is connected to the balance beam upside down, without satisfying the condition that the height of the propelling trolley must be greater than the height of the lifting cylinder, and the selectivity of the height of the propelling trolley can be greatly improved. By reducing the height of the propelling trolley, the The overall height of the mobile formwork, the present invention can reduce the overall height of the mobile formwork by about 1 meter, effectively reducing the clearance height under the bridge occupied by the mobile formwork system, and meeting the construction conditions of bridges with low piers. The invention has the advantages of reasonable design, simple structure, light overall weight and safe and convenient use.

Description of drawings

Fig. 1 is a front view of the overall structure of the present invention.

Fig. 2 is a right view of the overall structure of the present invention.

Fig. 3 is an overall schematic diagram of the present invention for moving formwork.

Among them: 1-main girder box support frame, 2-first high-strength bolt group, 3-first hinge support, 4-pin shaft, 5-second hinge support, 6-second high-strength bolt group, 7-balance Beam, 8-third bolt group, 9-lift cylinder, 10-propelling trolley; 11-piston rod; 12-lower bottom plate of main girder; 13-top flange plate of corbel beam; 14-bridge to be poured; 15-front pier ; 16 - the installation position of the front balance beam support system; 17 - the rear pier; 18 - the installation position of the rear balance beam support system.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

Specific embodiments of the present invention are provided below, and it should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations done on the basis of the technical solutions of the present application all fall within the scope of protection of the present invention.

As shown in Figures 1 and 2, the girder box support frame 1 of the present invention is vertically arranged in the girder box body and installed on the top of the girder box, and is welded by several steel plates. A bolt group 2 is connected to the lower part of the main girder box support frame 1 to ensure the reliability of the connection between the first hinge support 3 and the main girder box support frame 1 . The first hinge support 3 is connected with the second hinge support 5 through the pin shaft 4 to form a hinge support structure, and the front and rear fulcrums of the main beam form a simply supported beam by virtue of the hinge support structure, which can balance the force on the front and rear ends of the main beam during the pouring process. The second hinge support 5 is connected to the balance beam 7 through the second high-strength bolt group 6 to form a balance beam support system, and the second high-strength bolt group 6 ensures the reliability of the connection between the balance beam 7 and the second hinge support 5 . The bottom of the balance beam 7 is installed with two inverted lifting cylinders 9 through the third bolt group 8, and the two lifting cylinders 9 are connected in a straight line parallel to the main beam, and the base of the lifting cylinder 9 is connected to the bottom of the balance beam 7; the third bolt group 8 Ensure that the lifting cylinder 9 and the balance beam 7 do not slip. The lifting cylinder 9 is a lifting hydraulic cylinder, which is provided with a liftable piston rod 11. The bottom of the main beam box is equipped with a main beam lower floor 12, and the position corresponding to the main beam lower floor 12 and the lifting cylinder 9 is provided. The through hole through which the rod 11 passes, the piston rod 11 passes through the through hole on the bottom plate 12 of the main girder, and its end is supported on the propulsion trolley 10, which presses on the upper flange plate 13 of the corbel beam, and passes through the lifting cylinder 9 The lifting of the piston rod can realize the lifting action of the main beam of the mobile formwork.

Main operating principle and process of the present invention: among the present invention, two hinge supports and bearing pin 4 form hinge support structure, and form balance beam type support system with balance beam 7, main girder is installed on bridge 14 to be poured, and At the front and rear fulcrums of the main girder (that is, the supporting positions of the front and rear piers of the main girder), that is, the 16 installation positions of the front balance beam support system on the front pier 15 and the 18 installation positions of the rear balance beam support system on the rear pier 17 are all arranged The balanced beam support system forms a simply supported beam mechanical model, as shown in Figure 3. When pouring concrete, it can ensure that the entire load is evenly transmitted to the corbel beam through the balance beam support system to prevent local overload and unbalanced load of the corbel beam. On the propelling trolley 10, the propelling trolley 10 is pressed on the upper flange plate 13 of the corbel beam. When moving the formwork to pour concrete, the piston rod 11 of the lifting cylinder 9 is stretched out and supported on the propulsion trolley 10 to raise the height of the main girder to reach the bridge pouring position. At this time, the main girder is separated from the propulsion trolley 10; , the lifting cylinder 9 retracts the piston rod to reduce the height of the main girder, so that the main girder is separated from the solidified bridge. The oil cylinder and the longitudinal moving oil cylinder complete the mold opening and longitudinal moving construction conditions of the mobile formwork, and enter the construction position of the next span bridge.

Claims (5)

1. mobile formwork girder supports and use an equalizer bar device, it is characterized in that: comprise the girder case being arranged on and advancing on chassis (10), and it is interior and be installed on the girder case bracing frame (1) of girder box top to be vertically arranged on girder case; The lower end of girder case bracing frame (1) connects hinged mechanism, and the lower end of hinged mechanism is connected with the top of equalizer bar (7), forms balance beam type support system; Between the bottom of equalizer bar (7) and propelling chassis (10), the hoist cylinder (9) that two are parallel to girder is installed; All arrange this balance beam type support system at the adjacent bridge pier Support Position place of girder, form the simply supported beam mechanical model of mobile formwork girder;

Described hinged mechanism comprises the first hinged-support (3) and the second hinged-support (5) that are hinged, and the upper end of the first hinged-support (3) connects girder case bracing frame (1), the second hinged-support (5) lower end connects equalizer bar (7);

Described hoist cylinder (9) is raise-lower hydraulic oil cylinder.

2. a kind of mobile formwork girder support equalizer bar device according to claim 1, it is characterized in that: the bottom of described girder case is provided with girder lower shoe (12), the position that girder lower shoe (12) is corresponding with hoist cylinder (9) offers the through hole that the piston rod of hoist cylinder (9) (11) can be made to pass through; Two described hoist cylinders (9) are inversion type, its base is connected to the two ends of equalizer bar (7) bottom, and its piston rod (11) is supported on through the through hole on girder lower shoe (12) and advances on chassis (10).

3. a kind of mobile formwork girder support equalizer bar device according to claim 1 and 2, is characterized in that: described first hinged-support (3) and the second hinged-support (5) are hinged by bearing pin (4).

4. a kind of mobile formwork girder support equalizer bar device according to claim 1 and 2, is characterized in that: between described girder case bracing frame (1) and the first hinged-support (3), be fixedly connected with respectively by bolt group between the second hinged-support (5) and equalizer bar (7) and between equalizer bar (7) and hoist cylinder (9).

5. a kind of mobile formwork girder support equalizer bar device according to claim 1 and 2, is characterized in that: described girder case bracing frame (1) is welded by some block plates.