CN102225580B - Method for longitudinally moving box girder internal mold - Google Patents

Abstract

The invention relates to casting and forming of bridge box girders, in particular to a method for longitudinally moving inner molds of box girders. It is characterized in that it includes the following steps: hoisting the overall reinforcement cage of the box girder to the beam-making platform, adjusting and inspecting the reinforcement cage; The end is extended outwards for laying and installation to form a box girder inner mold storage area outside the girder base; the box girder inner mold in a contracted state is pulled by a winch, and the box girder inner mold is dragged along the anti-rail wheel from the storage area to the The beam-making pedestal or the beam-making pedestal is dragged to the storage area to realize the longitudinal movement of the inner formwork of the box girder. The advantage is that the whole inner formwork is pulled out from one end of the beam body at one time, and there is no need to manually remove the formwork and bolts. The inner formwork is all carried out by hydraulic cylinders. zoom. The spiral struts can be suspended on the main beam without manually carrying out the beam body; using the main beam of the internal mold as the longitudinal movement track does not require laying additional rails.

Description

Method of Longitudinal Movement of Box Girder Internal Formwork

technical field

The invention relates to casting and forming of bridge box girders, in particular to a method for longitudinally moving inner molds of box girders.

Background technique

In highway bridge construction, the application of prestressed prefabricated box girder is more and more common. And its prefabricated box girder inner mold mostly adopts combined formwork. It is the most widely used formwork form in engineering construction. It is composed of several types of plates with a certain modulus, angle formwork, supports and connectors, and it can be used to spell out various sizes and geometric shapes. It can be directly assembled on site during construction, or it can be pre-assembled into a large formwork or component formwork and hoisted and installed by a crane. The plates of the combined formwork are made of all steel, and are also made of composite steel frames and wood (bamboo) plywood panels. Combined formwork is not only used in construction engineering, bridge engineering, but also in underground engineering. However, it is difficult for the low-height combined internal formwork to enter the box room to remove the formwork, which is time-consuming and labor-intensive, which not only increases the construction cost, but also affects the construction progress; Deformation will affect the quality of the beam body in future construction.

In addition to the common methods mentioned above, a method for moving the inner mold is disclosed in the application (patent) No. CN200610201284.6 of "Automatic Hydraulic Prefabricated Box Girder Internal Mold System". The method is: the inner formwork is hinged by a top die, a pair of upper female corner dies and a pair of lower female corner dies, the upper inclined oil cylinder is connected between the top die and the upper female corner die, and the lower inclined oil cylinder is connected to the upper female corner die. Between the corner formwork and the lower female formwork, a support frame is provided along the depth of the box girder in the center of the cavity formed by the inner formwork, and a steel rail is erected on the support frame, and a translation trolley runs on the rail. And the support beam fixed on the frame, the frame of the translation trolley extends to the outside of the inner formwork, and the hydraulic pump station and the operation table are placed on it. The invention has the advantages of simple structure, less steel consumption, low cost, simple use and operation, and the translation trolley can travel as a whole, which facilitates the overall entry and exit of the inner mold.

Although the technical solutions disclosed in the above patents have certain advantages, they need to set rails and translation trolleys to cooperate with the movement of the inner mold, which adds a large amount of equipment to assist construction, and it is inconvenient to promote in bridge construction; on the other hand, if rails are used, it is impossible According to the actual construction needs free extension, strong limitations.

Contents of the invention

The purpose of the present invention is to provide a method for the longitudinal movement of the box girder inner formwork according to the shortcomings of the above-mentioned prior art. The anti-rail wheel and its supporting frame are arranged on the outer extension, and the anti-rail wheel is set in cooperation with the main beam of the inner mold, and the longitudinal movement of the inner mold in the box girder can be realized through hoist and other equipment.

The object of the present invention is realized by the following technical solutions:

A method for longitudinally moving the inner mold of a box girder, which is characterized in that it includes the following steps: hoisting the overall reinforcement cage of the box girder to the beam-making platform, adjusting and inspecting the reinforcement cage; installing anti-rail wheels and Its supporting frame is extended and installed through the two ends of the beam-making base to form a storage area for the box girder inner mold outside the beam-making base; the box girder inner mold in the shrinking state is pulled by a hoist, and the box girder inner mold is pulled The anti-track wheel is dragged from the storage area to the beam-making pedestal or from the beam-making pedestal to the storage area to realize the longitudinal movement of the inner mold of the box girder.

A track cooperating with the anti-rail wheel is arranged on the contact surface between the lower side of the main girder of the box girder inner mold and the anti-rail wheel.

The number of prefabricated pedestals with anti-track wheels and their support frames inside is multiple, arranged vertically and transitionally connected by the anti-track wheels and their support frames in the storage area.

The advantages of the present invention are:

1. The whole inner mold is pulled out from one end of the beam body at one time, without manually dismantling the formwork and bolts, and the inner mold is all scaled by hydraulic cylinders. The spiral braces can be suspended on the main beam without manual transport out of the beam.

2. Using the main girder of the internal mold as the longitudinal moving track does not need to lay additional rails;

3. The main beam of the inner mold has high strength and rigidity. The whole set of inner mold can be hoisted into the mold as a whole, or can be slid into the steel cage by itself and then stretched out of the cylinder to form the mold. There is no need for hangers and other special lifting tools for hoisting the inner mold , the hoisting is very convenient;

4. The inner mold is self-heavy, which can effectively prevent the formwork from floating during the pouring process;

5. The supporting frame of the inner mold is designed with a walking landing gear, and a single person can easily drag the supporting frame out of the cavity of the beam body.

Description of drawings

Accompanying drawing 1 is a schematic diagram of the overall structure of the inner membrane of the present invention;

Accompanying drawing 2 is the schematic diagram of segmental stretching state in the internal mold of the present invention;

Accompanying drawing 3 is the segmental contraction state schematic diagram in the internal mold of the present invention;

Figure 4 is a schematic diagram of the process of intima longitudinal displacement in the present invention.

Detailed ways

The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

As shown in Figures 1-4, the labels 1-7 respectively represent: beam-making pedestal 1, inner mold 2, anti-rail wheel 3, support frame 4, storage area 5, track 6, beam 7.

Referring to Figure 2, the structures involved in this embodiment mainly include the inner mold bracket and the inner membrane 2:

The inner mold bracket is made up of anti-rail wheel 3, crossbeam 7 and bracing frame 4 three parts. When installing the inner mold brackets (a total of 8), lift them into the reserved holes of the bottom plate reinforcement (that is, use the drain hole of the bottom mold of the box girder), and at the same time, the screws at the lower end of the support frame 4 need to correspond to the reserved holes on the bottom mold. It is integrated with the bottom mold through nut connection to maintain its overall stability. Correspondingly, on the contact surface between the lower side of the main beam of the inner mold 2 and the anti-rail wheel 3, a track 6 cooperating with the anti-rail wheel is provided. With this structure, the main girder of the inner mold 2 is used as the longitudinal movement track without laying additional rails, and after a number of inner mold brackets are evenly distributed in the middle of the two beam-making pedestals 1, the inner mold 2 can be formed by a beam-making pedestal. 1 Move to another beam-making pedestal 1, then dismantle the unused inner mold bracket, and lay it to the area to be transported in the next section. When avoiding the scheme of moving the inner membrane 2 on the rail, the inner membrane 2 cannot be moved continuously due to the length of the rail, and only a combination of suspension movement and sliding can be adopted.

In combination with the above device structure, the method in this embodiment is described in detail below:

1. Lift the overall reinforcement cage of the box girder to the beam-making platform 1, adjust and inspect the reinforcement cage;

2. Install the end and middle anti-rail wheels 3 and the support frame 4 to the corresponding positions on the box girder pedestal 1;

3. Use a 5t winch to pull the inner mold 2, and drag the inner mold 2 stored on the anti-rail wheel 3 in the storage area 5 to the corresponding position of the beam-making platform 1 as a whole;

4. Relying on the supporting effect of the hydraulic cylinder, the inner mold 2 is gradually opened and supported in sequence;

5. After the inner mold 2 is fully opened, the person enters the inner mold 2, supports and reinforces the inner mold 2 with a spiral strut and a pin shaft, and then installs the end mold in place;

6. When demoulding, people enter the box to remove the reinforcement struts of the inner mold 2, manipulate the hydraulic control system placed at the outer end of the inner mold 2, and shrink the hydraulic cylinders in sequence;

7. After receiving, the inner mold 2 is lowered as a whole, and the track 6 at the lower end of the main beam of the inner mold 2 falls on the anti-rail wheel 3 on the support frame 4;

8. Use a 5t hoist to drag the inner mold 2 as a whole to the beam body, and drop it onto the anti-track wheel 3 in the storage area 5;

The entire demoulding process only needs 4 workers and can be completed in 2 hours.

The following issues should be paid attention to in the above steps:

1. Before each working cycle, check whether the limit switches are reliable, whether the traction wire rope, pulley and hydraulic system pressure and liquid level are normal, whether the pulley, running wheel bearing seat, and lubrication are in good condition, and work can only be performed after confirming normal;

2. Check and measure the dimensions of each part of the concrete before pouring to ensure that the relevant dimensions and flatness meet the requirements before pouring concrete;

3. When pulling the traveling trolley template to move, observe whether there is any obstacle in the moving direction at any time, so as to prevent the trolley from jumping off the track and dragging other machinery and equipment;

4. The solidification time of concrete should not be too long. When the strength reaches 60~70% of the design strength of the concrete, it needs to be demoulded, otherwise it will cause difficulty in demoulding;

5. If the supply of longitudinal moving rail is tight, I-beam or channel steel can be used for back-to-back welding.

Claims (2)

1. a box girder inner formwork vertical shift method, is characterized in that comprising the steps: to lift the box girder integral steel reinforcement cage to beam making bench, adjusts and checked steel reinforcement cage; Anti-rail wheel and bracing frame thereof longitudinally are installed on the case girder prefabricated pedestal successively, and are stretched out to lay through beam making bench two ends and install, to consist of the box girder inner formwork storage area outside beam making bench; Adopt the hoist engine traction to be in the box girder inner formwork of contraction state, described box girder inner formwork is dragged to beam making bench or dilatory to storage area by beam making bench along anti-rail wheel is whole by storage area, realize the vertical shift of box girder inner formwork, be provided with the track that coordinates with described anti-rail wheel on the contact-making surface of described box girder inner formwork girder downside and described anti-rail wheel.

2. a kind of box girder inner formwork vertical shift method according to claim 1, it is characterized in that: the described precast pedestal quantity that is provided with anti-rail wheel and bracing frame thereof in it is a plurality of, and longitudinal arrangement and anti-rail wheel and bracing frame transition connection thereof by described storage area.

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