A box girder formwork support and its installation method

Abstract

The present invention provides a box girder formwork support, which includes a number of jacks, a number of screw rods, a number of top supports, a number of wooden squares, an upper bearing pad stone, a bearing, a lower bearing pad stone, and a bearing pad stone. The screw rods are arranged in the corresponding pressure relief threaded holes of the jacks. The top supports are arranged on the upper parts of the corresponding jacks. The wooden squares are arranged on the upper parts of the corresponding top supports. The upper bearing pad stone, the bearing, and the lower bearing pad stone form a side bearing, and the side bearing is arranged on one side of the jacks. The present invention also provides an installation method for the above device. First, install the lower bearing pad stone and the bearing pad stone, and set the elevation lines of the bottom formwork of the box girder at the piers and abutments; lay the bottom formwork of the box girder; after connecting and installing the steel bars of the box girder, pour concrete, and finally remove the jacks, and remove the wooden squares and the bottom formwork of the box girder. This device and method avoid the situation where the formwork and the wooden squares cannot be removed during formwork removal, and improve the engineering quality and progress.

Description

Technical Field

[0001] The present invention belongs to the field of municipal bridge engineering, and mainly relates to a box girder formwork support at the bridge bearing and its installation method. It provides a more convenient and effective method for the installation and removal of the formwork at the bridge bearing, and has good practical significance. Background Art

[0002] At present, in order to develop the economy and accelerate transportation construction, the country is carrying out rapid renovation and construction of more and more railways and bridges. Especially the construction of bridges has shortened the distance between two places, reduced transportation costs and facilitated travel modes. However, during the construction of bridges, there are always some construction techniques that trouble the project builders. Especially during the construction of the installation of bridge bearings, due to the small distance between the bottom of the box girder and the abutment, only a height difference of 300 - 400 mm, it is very difficult to install and remove the formwork at the bottom of the box girder and the upper cushion stone at the bearing. If there is a better technique that can well solve the above problems, it can enable the project to be carried out more effectively. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a box girder formwork support and its installation method.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A box girder formwork support includes a number of jacks, a number of screw rods, a number of top supports, a number of wooden squares, an upper cushion stone, a bearing, a lower cushion stone, and a bearing cushion stone. Wherein, the screw rods are arranged in the corresponding pressure relief threaded holes of the jacks, the top supports are arranged on the upper parts of the corresponding jacks, the wooden squares are arranged on the upper parts of the corresponding top supports, the upper cushion stone, the bearing, and the lower cushion stone form a side bearing, and the side bearing is arranged on one side of the jacks;

[0006] Further, the bearing is composed of an upper bearing part, a middle bearing part, and a lower bearing part. The upper bearing part is in a downward convex arc shape, the lower bearing part is in an upward convex arc shape, and the middle bearing part is in a circular arc shape. The lower surface of the upper bearing part is matched with the upper surface of the middle bearing part, and the lower surface of the middle bearing part is matched with the upper surface of the lower bearing part; thus enabling the bearing to automatically align and bear a large load;

[0007] Further, the cross-section of the upper cushion stone is square or circular;

[0008] Further, the cross-section of the lower cushion stone is square or circular;

[0009] Further, a jack base is arranged at the bottom of the jack;

[0010] Further, a detachable connection is adopted between the jack base and the jack.

[0011] To achieve the above object, the present invention also provides an installation method for a box girder formwork support. First, install the lower bearing padstone and the bearing padstone, and set the elevation line of the bottom formwork of the box girder at the piers and abutments; place one jack with a load-bearing capacity of not less than 2T on each side, 300mm away from both sides of the bearing padstone. After adjusting the height of the jack up and down through the screw rod, lay the bottom formwork of the box girder; next, connect and install the steel bars of the box girder, then pour concrete. After the concrete curing strength reaches the pre-designed requirements, unload the jack; finally, remove the jack, remove the wooden square and the bottom formwork of the box girder, and repeat the above process to carry out the installation construction of the bottom formwork of the box girder at other supports.

[0012] The advantages and positive effects of the present invention are: due to the adoption of the above technical solution, the construction device is simple to install and convenient to disassemble; the construction speed is fast, saving a large amount of manpower and material resources; it can avoid the situation that the formwork and the wooden square cannot be removed during formwork removal, improving the engineering entity quality and construction progress. Brief Description of the Drawings

[0013] Figure 1 is the plan view of the embodiment of the present invention;

[0014] Figure 2 is Figure 1 the cross-sectional view taken along 1-1 in

[0015] Figure 3 is Figure 1 the cross-sectional view taken along 2-2 in, in the figure: Detailed Description of the Embodiments

[0016] Next, the various product models or technical terms such as "first", "second", "upper", "lower", "left", "right", "front", "rear", "far", "near" mentioned in the present invention are all technical terms that have been clearly known in the technical field and are some definitions in terms of position or space for the convenience of describing the embodiments, and are not limitations to the present invention, so no more explanations will be made.

[0017]

[0018]

[0019] ​​A box girder formwork support includes several jacks 1, several screw rods 2, several top supports 3, several wooden beams 4, an upper cushion stone 5, a bearing 6, a lower cushion stone 7, and a bearing cushion stone 8. Among them, the screw rods are arranged in the corresponding pressure application and unloading threaded holes of the jacks, the top supports are arranged on the upper parts of the corresponding jacks, the wooden beams are arranged on the upper parts of the corresponding top supports, the upper cushion stone, the bearing, and the lower cushion stone form a side bearing, and the side bearing is arranged on one side of the jacks;

[0020] Further, the bearing is composed of an upper bearing part, a middle bearing part, and a lower bearing part. The upper bearing part is in a downward convex arc shape, the lower bearing part is in an upward convex arc shape, the middle bearing part is in a circular arc shape. The lower surface of the upper bearing part is matched with the upper surface of the middle bearing part, and the lower surface of the middle bearing part is matched with the upper surface of the lower bearing part; thus enabling the bearing to automatically align and bear a large load;

[0021] For the appearance design and specific connection and installation methods, please refer to the attached Figure 1 - attached Figure 3 as shown. (Unit: mm)

[0022] The following combines specific examples to illustrate the installation method of a box girder formwork support of the present invention.

[0023] 1. The on-site surveyors release the elevation lines of the bottom formwork of the box girder at the piers and abutments;

[0024] 2. Before releasing the elevation lines of the bottom formwork, the lower cushion stone and the bearing have been installed and constructed;

[0025] 3. At 300 mm on both the east and west sides of the bearing cushion stone, place a hand-operated portable jack with a load-bearing capacity of not less than 2 T each. The hand-operated portable jack is composed of a jack group and a screw rod. The north-south placement spacing of the jacks is 600 mm, and the jacks on both the east and west sides are arranged staggeredly (similar to the plum blossom arrangement in steel bar binding), which is convenient for the screw rod to apply pressure and unload the jacks.

[0026] 4. The top of the jack is equipped with a channel steel of 8# (80 mm × 43 mm × 5.0 mm), which is arranged longitudinally from north to south. Wooden beams (5 mm × 8 mm × 3000 mm) are placed on the top support of the channel steel. Since the construction width in this area is only 1.5 m, the 3 m wooden beams are cut in half in the middle for use, and the north-south spacing of the wooden beams is 200 mm.

[0027] 5. After adjusting the height of the jack up and down by hand-operating the screw rod, lay the bottom formwork of the box girder.

[0028] 6. After connecting and installing the box girder steel bars here, pour the concrete. After the concrete curing strength reaches the design requirements, unload the jacks.

[0029] 7. Remove the jack combination, and remove the wooden beams and the bottom formwork of the box girder.

[0030] 8. Repeat the above process to install the bottom formwork of the box girder at other bearings.

[0031] Embodiment 2:

[0032] A method for installing the formwork of a box girder at a bridge bearing, using tools including: ①: Jack; ②: Screw; ③: Top support (8# channel steel); ④: Wooden square 5mm×8mm×300mm; ⑤: Upper bearing pad stone; ⑥: Bearing; ⑦: Lower bearing pad stone; ⑧: Bearing pad stone.

[0033] 1. The on-site surveyors release the elevation line of the bottom formwork of the box girder at the piers and abutments.

[0034] 2. Before releasing the elevation line of the bottom formwork, the installation of the lower bearing pad stone and the bearing has been completed.

[0035] 3. Place a hand-operated portable jack with a load-bearing capacity of not less than 2T on each side, 300mm east and west of the bearing pad stone. The hand-operated portable jack is composed of a jack group and a screw. The north-south spacing of the jacks is 600mm, and the jacks on the east and west sides are staggered (similar to the plum blossom arrangement in steel bar binding) to facilitate the screw to pressurize and unload the jacks.

[0036] 4. The top of the jack is equipped with 8# (80mm×43mm×5.0mm) channel steel, which is arranged longitudinally from north to south. Place a wooden square (5mm×8mm×3000mm) on the top of the channel steel. Since the construction width of this area is only 1.5m, the 3m wooden square is cut in half and used, and the north-south spacing of the wooden squares is 200mm.

[0037] 5. After adjusting the height of the jack up and down by turning the hand-operated screw, lay the bottom formwork of the box girder.

[0038] 6. After connecting and installing the steel bars of the box girder here, pour the concrete. After the concrete curing strength reaches the design requirements, unload the jack.

[0039] 7. Remove the jack combination and dismantle the wooden square and the bottom formwork of the box girder.

[0040] 8. Repeat the above process to install the bottom formwork of the box girder at other bearings.

[0041] The above has described the embodiments of the present invention in detail, but the above content is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A box girder formwork support, comprising a number of jacks, a number of screws, a number of top supports, a number of wooden beams, an upper bearing pad stone, a bearing, a lower bearing pad stone, and a bearing pad stone, characterized in that, The screw is arranged in the corresponding jack pressure relief threaded hole, the top support is arranged on the upper part of the corresponding jack, the wooden square is arranged on the upper part of the corresponding top support, the upper cushion stone, the bearing and the lower cushion stone form a side bearing, and the side bearing is arranged on one side of the jack.

2. The box girder formwork support according to claim 1, characterized in that, The bearing is composed of an upper bearing part, a middle bearing part and a lower bearing part. The upper bearing part is in a downward convex arc shape, the lower bearing part is in an upward convex arc shape, the middle bearing part is in a circular arc shape. The lower surface of the upper bearing part is matched with the upper surface of the middle bearing part, and the lower surface of the middle bearing part is matched with the upper surface of the lower bearing part.

3. The box girder formwork support according to claim 1, characterized in that, The cross-section of the upper cushion stone is square or circular.

4. A box girder formwork support according to claim 1, characterized in that, The cross-section of the lower cushion stone is square or circular.

5. A box girder formwork support according to claim 1, characterized in that, A jack base is arranged at the bottom of the jack.

6. The box girder formwork support according to claim 5, wherein, A detachable connection is adopted between the jack base and the jack.

7. A method for installing a box girder formwork support as described in claim 1, characterized in that: The steps are as follows: A: Install the lower cushion stone and the bearing cushion stone, and set the elevation line of the bottom formwork of the box girder at the piers and abutments; B: Place one jack with a load-bearing capacity of not less than 2T at each side 300 mm away from the two sides of the bearing cushion stone. After adjusting the height of the jack up and down through the screw, lay the bottom formwork of the box girder; C: After connecting and installing the box girder steel bars, pour concrete. After the concrete curing strength reaches the pre-designed requirements, unload the jack; D: Remove the jack, remove the wooden square and the bottom formwork of the box girder, and repeat the above process to carry out the installation construction of the bottom formwork of the box girder at other bearings.

Images