CN110499711A - Down-going self-moving formwork bracket and transporting method thereof - Google Patents

Abstract

The invention belongs to the technical field of bridge construction, and specifically discloses a downward self-moving formwork corbel and a method for reversing it. There is a mobile formwork trolley that drives the corbels to move horizontally in the left and right direction. A Y-shaped connecting arm is provided at the inner end of each corbel. The front and rear sides of each Y-shaped connecting arm end are respectively rotated and connected to The connecting beam, the two corbel beams are movably connected through the connecting beams on the front and rear sides of the end respectively, and the interconnected connecting beams are locked and fixed by the locking device, compared with the traditional downward self-moving formwork corbel The fixing method of tensioning steel bars has high strength and light weight, which can save materials and resources for the manufacture of corbels. The two corbels are rigidly connected by connecting beams, which do not generate horizontal and transverse bending moments, and do not need to be placed on bridge piers. Set reserved holes, especially suitable for double-column piers, hollow piers or thin-walled piers.

Description

A self-moving formwork corbel in the downward direction and its reversing method

technical field

The invention belongs to the technical field of bridge construction, and in particular relates to a downward self-moving formwork corbel and a reverse transportation method thereof.

Background technique

The traditional downward self-moving formwork is fixed between the two corbels at the left and right ends of the bridge pier in the mold closing state, and is fixed by a number of steel bars. This installation method requires opening holes in the bridge pier. For thin-walled piers or For hollow piers, the larger opening size will affect the strength of the pier. At the same time, not only the steel bars must be removed when the mold is opened, but also the corbel beam must be transported to the next span with a crane. The operation process is time-consuming and laborious.

Contents of the invention

The object of the present invention is to provide a self-moving formwork corbel and its reverse movement method, which has the advantages of good rigidity, reliable structure, and is suitable for thin-walled piers and hollow piers.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A downward self-moving formwork corbel, including two corbels arranged horizontally on the left and right sides of the bridge pier, each corbel is equipped with a mobile formwork that drives the corbel to move laterally in the left and right directions For the trolley, a Y-shaped connecting arm is provided at the inner end of each corbel beam, and the front and rear sides of each Y-shaped connecting arm end are respectively connected to the connecting beam through the rotating shaft. The connecting beams on the side are movably connected, and the connecting beams connected to each other are locked and fixed by a locking device.

Further, there are four connecting beams, and the four connecting beams form a zigzag structure, and the pier is located in the area surrounded by the four connecting beams, and the locking device includes pin holes arranged at the ends of the connecting beams, and the Two connecting beams are connected to fixed locking pins.

Further, the lower parts of the corbels are respectively provided with corbel outriggers, the corbel outriggers are arranged vertically, the upper ends of the corbel outriggers are fixedly connected with the corbels, and the lower ends of the corbel outriggers are fixedly connected with the ground.

Further, the bottom of the bridge pier is also provided with a horizontal preset hole, and a steel bar is inserted in the preset hole, and both ends of the steel bar are fixedly connected with the corbel outriggers respectively.

An unlucky method for moving the corbel of a formwork downward by itself, comprising the following steps:

a) The initial state of the mobile formwork is in the mold-closed state, and the concrete box girder is poured for the span. After the concrete box girder is poured, the two locking mechanisms on the front and rear sides of the pier are unlocked, and the corbel beams are removed. Corbel outriggers and reinforcement on corbel outriggers;

b) One end of the chain hoist is fixed on the corbel beam, and the other end is fixed on the connecting beam on the rear side of the bridge pier, and the two connecting beams on the rear side of the bridge pier are pulled and rotated outward by the chain hoist, and the rotation angle is greater than 90 degrees ;

c) The mobile formwork trolley drives the corbel beam to move laterally relative to the pier;

d) The mobile formwork moves longitudinally, and the corbel beam moves longitudinally following the mobile formwork. When the corbel leaves the bridge pier, one end of the chain hoist is fixed on the corbel beam, and the other end is fixed on the connecting beam at the front end. Pull the two connecting girders on the front side of the pier to the outside and rotate them with the pulley, and the rotation angle is greater than 90 degrees; e) The mobile formwork moves longitudinally, the corbels move into the next span, and the two corbels move to the pier of the next span the left and right sides of

f) Fix one end of the chain hoist on the corbel beam, and fix the other end on the connecting beam at the front end of the pier, and use the chain hoist to pull and rotate the two connecting beams on the front side of the pier to the inside until the two connecting beams rotate To form a straight line, one end of the chain hoist is fixed on the corbel beam, and the other end is fixed on the connecting beam at the rear end of the pier, and the two connecting beams at the rear of the pier are pulled and rotated inward by the chain hoist until the two The connecting beam rotates to form a straight line;

g) The mobile formwork trolley drives the corbel girder to move laterally relative to the bridge pier, the locking device locks and fixes the inner ends of the two connecting beams at the front end of the bridge, and the locking device locks and fixes the inner ends of the two connecting beams at the rear end of the bridge .

Further, in the step g), corbel legs are respectively installed at the lower end of the corbel beam according to the needs of use, and steel bars are arranged between the two corbel legs for reinforcement.

The advantages of the present invention are: compared with the traditional downward self-moving formwork corbels, which are fixed by steel bars, the mobile formwork corbels provided by the present invention have high strength and light weight, and can save materials for corbel manufacturing. Resources are saved, the two corbels are rigidly connected by connecting beams, no horizontal transverse bending moment is generated, and no reserved holes are set on the piers, especially suitable for double-column piers, hollow piers or thin-walled piers. In the limit state, the corbel beam can be infinitely close to the ground, so the construction of ultra-short pier can be realized; when the mobile formwork drives the corbel beam to pass through the hole, you only need to unlock the locking device, and turn the connecting beam to the outside to open That is to say, the corbel girder follows the moving formwork to move longitudinally through the hole, reaches the pier of the next span, and then turns the connecting beam inward, and uses the locking device to lock and fix the two connecting beams in a straight line. The whole process It does not need to be lifted by a crane, and is suitable for high-altitude operations, which enhances the safety factor. For water operations, there is no need for manual launching during the reverse transportation process.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the present invention;

Fig. 2 is a schematic structural view of the rotating shaft of the present invention;

Fig. 3 is the top view structure schematic diagram of the present invention;

Fig. 4 is a schematic diagram of the state I of the via hole of the present invention;

Fig. 5 is a schematic diagram II of the state of the via hole of the present invention;

Fig. 6 is a schematic diagram of the state III of the via hole of the present invention;

Fig. 7 is the state schematic diagram I of the corbel beam of the present invention being transported backward into the next bridge pier;

Fig. 8 is a schematic diagram II of the state where the corbel beam of the present invention is transported backward into the next bridge pier;

Fig. 9 is a schematic diagram of the state where the corbel beam of the present invention is transported backward into the next bridge pier place III;

Fig. 10 is a schematic view IV of the state where the corbel beam of the present invention is transported backward into the next bridge pier;

In the figure, 1, bridge pier; 2, corbel; 3, mobile formwork trolley; 4, connecting beam; 5, corbel outrigger; 6, steel bar; 7, rotating shaft; 8, locking pin.

Detailed ways

In this application, about orientation words such as front, back, left, right, etc., all refer to Fig. 1 .

As shown in the figure, a downward self-moving formwork corbel includes two corbels 2, which are respectively located on the left and right sides of the pier 1, and the corbels 2 are connected under the corresponding mobile formwork trolley 3 on the same side. The mobile formwork trolley 3 drives the corbel beam 2 to move laterally in the left and right direction (the mobile formwork trolley drives the corbel beam to move laterally from side to side, which is a commonly used technical means in this field, for details, refer to the application document with publication number CN201310214235), the corbel beam 2 The inner side is provided with a Y-shaped connecting arm, and the front and rear sides of the connecting arm are respectively rotated by the rotating shaft 7 to install the connecting beam 4. When the two connecting beams 4 on the front side of the pier 1 are rotated to form a straight line, the inner side of the two connecting beams 4 The ends are locked and fixed by the locking device. When the two connecting beams 4 on the rear side of the pier 1 are rotated to form a straight line, the inner ends of the two connecting beams 4 are locked and fixed by the locking device. The four connecting beams 4 form a zigzag structure. The bridge pier 1 is located in the area within the four connecting beams 4, and the locking device may have the following structure, which includes pin holes arranged at the inner side of the connecting beams 4, when the two connecting beams 4 on the front side and the rear side of the bridge pier 1 rotate to During a straight line, the two pin holes at the inner ends of the two connecting beams 4 have the same axis, and the locking pin 8 is inserted into the two pin holes of the same axis. Using the locking pin 8 to lock the two connecting beams 4 rotating to the same straight line, the operation is simple and the construction efficiency is improved; since the corbel beam 2 and the two rotating connecting beams 4 form a Y-shaped structure, at the same time The two connecting beams 4 are locked and fixed by the locking device. Therefore, compared with the traditional way of fixing the corbels of the downward self-moving formwork by tensioning steel bars, the strength is high and the weight is light, which can save materials for corbels and save resources, the two corbels are rigidly connected by the connecting beam 4, no horizontal transverse bending moment is generated, and no reserved holes are set on the pier 1, which is especially suitable for double-column piers, hollow piers or thin-walled piers. The corbel 2 can be infinitely close to the ground, so the construction of ultra-short pier can be realized. When the mobile formwork drives the corbel 2 to pass through the hole, it is only necessary to unlock the locking device and turn the connecting beam 4 outward to open it. The corbel beam 2 can be moved longitudinally through the hole following the moving formwork, and then the connecting beam 4 can be rotated inward after reaching the pier 1 of the next span, and the two connecting beams 4 in a straight line can be locked and fixed by the locking device , The whole process does not need to be lifted by a crane, which is suitable for high-altitude operations and enhances the safety factor. For water operations, there is no need for manual launching during the reverse transportation process.

Preferably, it also includes two vertically arranged corbels 5, the upper end of the corbel 5 is connected to the bottom of the corbel 2 on the same side, and its lower end is in contact with the ground. 5 can support the corbel beam 2, which improves the overall rigidity of the equipment, and can also include preset holes horizontally arranged in the pier 1, and the steel bars 6 are inserted into the preset holes, and the two ends of the steel bars 6 are respectively connected to the same side of the cow The legs and outriggers 5 are connected, and the two corbel outriggers 5 are tightened and fixed by using the steel bar 6, which improves the firmness of the connection and fixation of the corbel outriggers 5.

An unlucky method for moving the corbels of a formwork downward by itself, comprising the following steps:

a) The mobile formwork is in the mold closing state, and the four connecting beams 4 form a zigzag structure. The pier 1 is located in the area inside the four connecting beams 4. The concrete box girder is poured for this span. After the concrete box girder is poured, the The two locking devices on the front and rear sides of pier 1 are unlocked, and the corbel outriggers on the corbel beam and the steel bars on the corbel outriggers are removed;

b) One end of the chain hoist is fixed on the corbel beam 2, and the other end is fixed on the connecting beam 4 on the rear side of the pier 1, and the two connecting beams 4 on the rear side of the pier 1 are pulled and rotated to the outside by using the chain hoist, The rotation angle is greater than 90 degrees;

c) The mobile formwork trolley 3 drives the corbel beam 2 to move laterally relative to the pier 1;

d) The mobile formwork moves longitudinally, and the corbel 2 moves longitudinally following the mobile formwork. When the corbel 2 leaves the pier 1, one end of the chain hoist is fixed on the corbel 2, and the other end is fixed to the connecting beam at the front end 4, use chain hoists to pull and rotate the two connecting beams 4 on the rear side of the pier 1 to the outside, and the rotation angle is greater than 90 degrees; The leg girder 2 moves to the left and right sides of the next bridge pier 1;

f) One end of the chain hoist is fixed on the corbel beam 2, and the other end is fixed on the connecting beam 4 at the front end of the pier 1, and the two connecting beams 4 on the front side of the pier 1 are pulled and rotated inward by the chain hoist until The two connecting beams 4 are rotated to form a straight line, one end of the chain hoist is fixed on the corbel beam 2, and the other end is fixed on the connecting beam 4 at the rear end of the pier 1, and the two ends on the rear side of the pier 1 are connected by the chain hoist. The connecting beam 4 is pulled and rotated inward until the two connecting beams 4 rotate to form a straight line;

g) The mobile formwork trolley 3 drives the corbel beam 2 to move laterally relative to the pier 1. The locking device locks and fixes the inner ends of the two connecting beams 4 at the front end of the bridge 1. The locking device locks and fixes the two connecting beams 4 at the rear end of the bridge 1. The inner side of the beam 4 is locked and fixed, and corbel outriggers are installed at the lower end of the corbel beam according to the needs of use, and steel bars are set between the two corbel outriggers for reinforcement; the whole process does not need to disassemble the corbel beam, and there is no need to use a crane to lift and transport , improving security.

Claims (6)

1. A downward self-moving formwork corbel, including two corbels arranged horizontally on the left and right sides of the bridge pier respectively, and each corbel is provided with a movement that drives the corbel to move laterally along the left and right directions The formwork trolley is characterized in that: the inner side of each corbel beam is provided with a Y-shaped connecting arm, and the front and rear sides of each Y-shaped connecting arm end are respectively connected to the connecting beam through the rotating shaft, and the two corbels are respectively The connecting beams on the front and rear sides of the ends are flexibly connected, and the connecting beams connected to each other are locked and fixed by a locking device. 2. The downward self-moving formwork corbel as claimed in claim 1, characterized in that: there are four connecting beams, the four connecting beams form a zigzag structure, and the pier is located in the area surrounded by the four connecting beams, The locking device includes a pin hole arranged at the end of the connecting beam, and a locking pin connecting and fixing the two connecting beams. 3. The downward self-moving formwork corbel as claimed in claim 2, characterized in that: the lower part of the corbel is also provided with a corbel support leg, the corbel support leg is vertically arranged, and the upper end of the corbel support leg It is fixedly connected with the corbel, and the lower end of the corbel outrigger is fixedly connected with the ground. 4. The downward self-moving formwork corbel as claimed in claim 3, characterized in that: the bottom of the pier is also provided with a preset hole in the horizontal direction, and a steel bar is inserted in the preset hole, and the two ends of the steel bar are respectively connected with the cow leg. Leg outriggers are fixedly connected. 5. A method for reversing the downward self-moving formwork brackets according to any one of claims 1-4, characterized in that it comprises the following steps: a) The initial state of the mobile formwork is in the mold-closed state, and the concrete box girder is poured for the span. After the concrete box girder is poured, the two locking mechanisms on the front and rear sides of the pier are unlocked, and the corbel beams are removed. Corbel outriggers and reinforcement on corbel outriggers; b) One end of the chain hoist is fixed on the corbel beam, and the other end is fixed on the connecting beam on the rear side of the bridge pier, and the two connecting beams on the rear side of the bridge pier are pulled and rotated outward by the chain hoist, and the rotation angle is greater than 90 degrees ; c) The mobile formwork trolley drives the corbel beam to move laterally relative to the pier; d) The mobile formwork moves longitudinally, and the corbel beam moves longitudinally following the mobile formwork. When the corbel leaves the bridge pier, one end of the chain hoist is fixed on the corbel beam, and the other end is fixed on the connecting beam at the front end. Pull the two connecting girders on the front side of the pier to the outside and rotate them with the pulley, and the rotation angle is greater than 90 degrees; e) The mobile formwork moves longitudinally, the corbels move into the next span, and the two corbels move to the pier of the next span left and right sides of f) Fix one end of the chain hoist on the corbel beam, and fix the other end on the connecting beam at the front end of the pier, and use the chain hoist to pull and rotate the two connecting beams on the front side of the pier to the inside until the two connecting beams rotate To form a straight line, one end of the chain hoist is fixed on the corbel beam, and the other end is fixed on the connecting beam at the rear end of the pier, and the two connecting beams at the rear of the pier are pulled and rotated inward by the chain hoist until the two The connecting beam rotates to form a straight line; g) The mobile formwork trolley drives the corbel girder to move laterally relative to the bridge pier, the locking device locks and fixes the inner ends of the two connecting beams at the front end of the bridge, and the locking device locks and fixes the inner ends of the two connecting beams at the rear end of the bridge . 6. The unlucky method for moving the formwork corbels downward by itself as claimed in claim 5, characterized in that: in the step g), corbel legs are respectively installed at the lower end of the corbel beam according to the needs of use, and two corbel supports Reinforcement is provided between the legs.