A method for installing a Y-shaped steel pier for a bridge

Abstract

The application discloses a Y-shaped steel pier mounting method for a bridge, wherein the Y-shaped steel column of the Y-shaped steel pier is divided into two sections, the lower section is a Y-shaped section, and the upper section is a straight section; the mounting method comprises the following steps: step one, mounting of a steel column pre-buried section and a pre-buried steel plate; step two, mounting of a Y-shaped section of the steel column; step three, mounting of a steel box girder; step four, mounting of a straight section of the steel column; step five, butt joint, adjustment and positioning of the straight section and the Y-shaped section of the steel column; step six, temporary removal of the butt joint of the straight section and the Y-shaped section of the steel column; step seven, pouring of concrete into the lower part of the steel column; and step eight, welding of the straight section and the Y-shaped section of the steel column. The Y-shaped steel pier, the pre-buried section and the bottom of the steel box girder are accurately connected, the butt joint precision and the welding quality of the key stress part of the bridge are effectively ensured, the difficulty of high-altitude operation, the temporary measure investment and the operation time are greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for installing Y-shaped steel bridge piers. Background Technology

[0002] The Y-shaped steel pier of the bridge consists of embedded steel plates, Y-shaped steel columns, concrete filling in the lower half of the steel columns, and a hinged support at the top of the column. The hinged support consists of an upper steel plate, an upper load-bearing vertical plate, a lower steel plate, a lower load-bearing vertical plate, and a pin. Traditional bridge installation methods mainly include the column-first, beam-later method and the beam-first, column-later method. 1. Column-first, beam-later method: The Y-shaped steel pier is installed first, followed by the steel box girder, and then the pin is inserted. This method has extremely high requirements for the alignment of the pin holes in the upper and lower load-bearing vertical plates; even slight deviations will prevent the pin from being inserted. To achieve precise adjustment, positioning supports, working platforms, and adjustment devices are required. This method has a long construction period, high risks associated with working at heights, and high costs. 2. Beam-beam-beam method: First, the Y-shaped steel columns and hinged supports are connected and installed to the steel box girder. Then, the lower part of the Y-shaped steel columns is connected to the pre-embedded steel columns of the foundation. This method avoids the problem of inaccurate alignment of the upper and lower steel pipe axes due to construction errors, which affects the joint welding and structural stress. The installation of Y-shaped steel columns and hinged supports requires the installation of positioning brackets, working platforms and adjustment devices. The construction period is long, the risk of working at height is high, and the cost is high. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide a method for installing Y-shaped steel bridge piers, so as to achieve precise positioning and connection of the Y-shaped steel bridge piers.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] The bridge uses a Y-shaped steel pier installation method, wherein the Y-shaped steel column of the Y-shaped steel pier is divided into two sections, the lower part is a Y-shaped section and the upper part is a straight section;

[0006] The installation method includes the following steps:

[0007] Step 1: Installation of embedded steel column sections and embedded steel plates;

[0008] Step 2: Installation of the Y-shaped steel column section;

[0009] Step 3: Steel box girder installation;

[0010] Step 4: Installation of straight sections of steel columns;

[0011] Step 5: Connect, adjust, and position the straight section and Y-shaped section of the steel column;

[0012] Step Six: Temporarily dismantle the connection between the straight section and the Y-shaped section of the steel column;

[0013] Step 7: Fill the lower part of the steel column with concrete and pour it.

[0014] Step 8: Weld the straight section of the steel column to the Y-shaped section.

[0015] in,

[0016] In step one, during the construction of the pier cap, the steel column pre-embedded sections and pre-embedded steel plates are installed. After the steel column pre-embedded sections are installed, the plane position and elevation should be re-measured before concrete pouring. If the adjustment is correct, the pier cap concrete should be reliably fixed before the pier cap concrete is poured. After the pier cap concrete is poured and cured to the design strength, the upper piers and steel box girders are installed.

[0017] In step two, the pre-embedded section of the steel column is re-measured before installation, and the installation axis is laid out. The Y-shaped section of the steel column is hoisted into place by a crane. The top plane position and elevation are re-measured and adjusted. Then, a set of plates are used to spot weld and fix the bottom joint in the circumferential direction.

[0018] In step three, a crane is used to hoist the steel box girder into place. The plane position and elevation of the steel box girder bridge deck are measured and positioned. After precise adjustment, both ends of the steel box girder are placed on temporary supports.

[0019] In step four, a truck crane and a hand-operated hoist suspended from the flange of the steel box girder are used to lift the straight section of the steel column into place. Then, the workers ride an aerial work platform to the hinge support to accurately align the pin holes of the upper and lower support plates and insert the pins to install the stop plate.

[0020] In step five, after the straight section of the steel column is installed, a crane or hand-operated hoist is used to lift the straight section of the steel column towards the Y-shaped section. After reaching the upper side of the Y-shaped section, the lifting rope is slowly adjusted to ensure that the lower end of the straight section of the steel column is accurately aligned with the upper end of the Y-shaped section. If there is any deviation, the Y-shaped section of the steel column is finely adjusted. At the same time, the overall alignment of the steel column is re-measured to ensure that the lower end of the straight section of the steel column is precisely aligned with the upper end of the Y-shaped section and that the overall alignment of the steel column is straight. After adjustment, the bottom joint of the Y-shaped section of the steel column is fully welded and fixed, and a positioning plate is set at the top to facilitate subsequent installation.

[0021] In step six, after the straight section and Y-shaped section of the steel column are connected, adjusted, and positioned, they are temporarily dismantled to allow for the pouring of concrete to fill the lower part of the Y-shaped steel column.

[0022] In step seven, concrete is poured to fill the Y-shaped section of the steel column. After the pouring is completed and cured to the design strength, the next installation procedure is carried out.

[0023] In step eight, after the concrete filling of the Y-shaped section of the steel column is poured and cured to the design strength, the straight section of the steel column is connected according to the method in step five. After re-measurement and adjustment, the lower end of the straight section of the steel column is precisely connected with the upper end of the Y-shaped section of the steel column, and the overall line of the steel column is straight. Then, the joint welding is performed.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The bridge uses a reasonable Y-shaped steel pier installation method, which effectively solves the problem of precise positioning and connection between the Y-shaped steel pier and the pre-embedded segments and the bottom of the steel box girder, effectively ensuring the docking accuracy and welding quality of the key load-bearing parts of the bridge; and greatly reducing the difficulty of working at heights, the investment in temporary measures, and the operation time. Attached Figure Description

[0026] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0027] Figure 1 This is a schematic diagram of the Y-shaped steel bridge pier of the present invention.

[0028] Figure 2 This is a schematic diagram of the first and second installation steps of the present invention.

[0029] Figure 3 The diagram shows steps three and four of the installation process of this invention.

[0030] Figure 4 The diagram shows steps five and six of the installation process of this invention.

[0031] Figure 5 The diagram shows steps seven and eight of the installation process of this invention.

[0032] In the picture:

[0033] 1-Embedded steel plate, 2-Embedded section of steel column, 3-Small Y-shaped section of steel column, 4-Concrete filling at the bottom of steel column, 5-Straight section of steel column, 6-Lower steel plate of hinged support, 7-Lower vertical plate of hinged support, 8-Upper vertical plate of hinged support, 9-Upper steel plate of hinged support, 10-Pin of hinged support, 11-Steel box girder. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0035] like Figure 1As shown, in this invention, the Y-shaped steel column is divided into two sections: the lower part is a small Y-shaped section of the steel column, and the upper part is a straight section of the steel column. The Y-shaped steel pier installation structure for bridges includes a pre-embedded steel plate 1, a pre-embedded steel column section 2, a small Y-shaped steel column section 3, concrete filling at the bottom of the steel column 4, a straight section of the steel column 5, a lower steel plate of the hinge support 6, a lower vertical plate of the hinge support 7, an upper vertical plate of the hinge support 8, an upper steel plate of the hinge support 9, a pin shaft of the hinge support 10, and a steel box girder 11.

[0036] Preferably, the embedded steel plate is a D1100×30 Q355C steel plate, with four 100×100×12mm angle steels at the bottom, a L=500mm shear key, and 48 HRB400φ25 anchor bars. The embedded section of the steel column is a φ650×586.2×20mm, L=1000mm elliptical steel pipe. The bottom section of the small Y-shaped section of the steel column has a cross-section of φ650×586.2×20mm, and the top section of the Y-shaped steel pipe has a cross-section of φ573.5×20mm. The straight section of the steel column is a φ573.5~φ300×20mm variable cross-section steel pipe; the concrete filling at the bottom of the steel column is C35 micro-expansion concrete. The steel plate under the hinge support is a φ300×30mm Q355C steel plate. The lower support bearing plate is a t=30mm Q355C steel plate. The upper support plate of the hinged bearing is made of Q355C steel plate with a thickness of t=24mm. Each hinged bearing has 3 upper support plates and 2 lower support plates. The upper steel plate of the hinged bearing is the same as the bottom plate of the beam. The hinged bearing pin is made of 45# steel with a diameter of φ60×356mm, and a 60×30×20mm 304# stainless steel stop plate is installed at the pin insertion end. The steel box girder is a box-type bridge span structure made of Q355C steel.

[0037] This invention first installs the lower small Y-shaped segment, then installs the steel box girder, and then installs the upper straight segment of the steel column. The interface between the straight segment and the lower small Y-shaped segment is then connected. If the connection deviation exceeds the allowable deviation, the small Y-shaped segment is adjusted. After retesting and confirming that there are no errors, the bottom joint of the small Y-shaped segment is welded, and the lower part of the steel column is filled with concrete. Finally, the joint between the small Y-shaped segment and the straight segment of the steel column is aligned and welded.

[0038] like Figures 2 to 5 As shown, the installation and construction process of the Y-shaped steel bridge pier of the present invention includes the following steps:

[0039] Step 1: Installation of steel column embedded sections and embedded steel plates: During the construction of the pier cap, the steel column embedded sections and embedded steel plates are installed. Before concrete pouring, the plane position and elevation of the steel column embedded sections should be re-measured after installation. If the adjustment is correct, the sections should be reliably fixed before the pier cap concrete is poured. After the pier cap concrete is poured and cured to the design strength, the upper piers and steel box girders are installed.

[0040] Step 2: Installation of the small Y-shaped steel column segment: Before installation, the pre-embedded section of the steel column is re-measured and the installation axis is laid out. The small Y-shaped steel column segment is hoisted into place by a crane. The top plane position and elevation are re-measured and adjusted. Then, the bottom joint is fixed by spot welding with 4 plates in the circumferential direction.

[0041] Step 3: Steel box girder installation: The steel box girder is hoisted into place using a crane. The plane position and elevation of the steel box girder on the bridge deck are measured and positioned. After precise adjustment, both ends of the steel box girder are placed on temporary supports.

[0042] Step 4: Installation of straight steel column sections: A truck crane and a hand-operated hoist suspended from the flange of the steel box girder are used to lift the straight steel column section into place. Then, two workers ride an aerial work platform to the hinge support to accurately align the pin holes of the upper and lower support plates and insert the pins to install the stop plate.

[0043] Step 5: Connecting, Adjusting, and Positioning the Straight Section and the Small Y-Shaped Section of the Steel Column: After the straight section of the steel column is installed, use a crane or hand-operated hoist to lift the straight section towards the small Y-shaped section. Once it reaches the upper side of the small Y-shaped section, slowly adjust the lifting ropes to accurately align the bottom of the straight section with the top of the small Y-shaped section. If there is any deviation, fine-tune the small Y-shaped section. Simultaneously, re-measure the overall alignment of the steel column to ensure precise alignment between the bottom of the straight section and the top of the small Y-shaped section, and that the overall alignment of the steel column is straight. After adjustment, fully weld the bottom seam of the small Y-shaped section for fixation, and install a positioning plate at the top to facilitate subsequent installation.

[0044] Step Six: Temporary Dismantling of the Connection Between the Straight Section and the Small Y-Shaped Section of the Steel Column: After the connection, adjustment, and positioning of the straight section and the small Y-shaped section of the steel column are completed, temporary dismantling is carried out to allow for the pouring of concrete to fill the lower part of the Y-shaped steel column.

[0045] Step 7: Concrete filling at the bottom of the steel column: Concrete filling of the small Y-shaped section of the steel column is carried out. After the concrete filling is completed and cured to the design strength, the next installation procedure is carried out.

[0046] Step 8: Welding the straight section and the small Y-shaped section of the steel column: After the concrete filling of the small Y-shaped section of the steel column is poured and cured to the design strength, the straight section of the steel column is joined according to the method in Step 5. The straight section of the steel column is re-measured and adjusted to ensure that the lower end of the straight section of the steel column is precisely joined with the upper end of the small Y-shaped section of the steel column and the overall line of the steel column is straight. Then, the joint is welded.

[0047] The technical solution of this invention effectively solves the problem of precise positioning and connection between Y-shaped steel piers and pre-embedded segments and the bottom of steel box girders, effectively ensuring the docking accuracy and welding quality of key load-bearing parts of the bridge; and significantly reducing the difficulty of high-altitude operations, the investment in temporary measures, and the operation time.

[0048] Its features are as follows: 1. Convenient and quick construction operation: During the installation of the upper straight section, the top is connected by a pin shaft, and the other end is a free end, which can easily achieve alignment and connection, resulting in fast construction speed without the need for operating scaffolds and positioning adjustment devices. 2. Enhanced construction quality: All joints are connected in the free state of the components, which can significantly reduce structural deformation and internal forces caused by construction. The welds are located near the ground and in areas of lower stress on the components, which is more conducive to high-quality welding, inspection, and structural stress and component durability. 3. Enhanced construction safety: Only when the pin shaft is inserted at the top hinge support of the straight section does the operator use an aerial work platform or suspended platform for high-altitude work. All other operations are carried out on the ground, which is more conducive to construction safety management and effectively ensures construction safety. 4. Short construction period and low construction cost: Since there is no need to erect operating scaffolds and positioning adjustment devices, the construction period can be significantly shortened and construction costs reduced.

[0049] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for installing Y-shaped steel bridge piers, characterized in that: The Y-shaped steel column of the Y-shaped steel pier is divided into two sections: the lower part is a Y-shaped section and the upper part is a straight section. The installation method includes the following steps: Step 1: Installation of embedded steel column sections and embedded steel plates; Step 2: Installation of the Y-shaped steel column section; Step 3: Steel box girder installation; Step 4: Installation of straight sections of steel columns; In step four, a truck crane and a hand-operated hoist suspended from the flange of the steel box girder are used to lift the straight section of the steel column into place. Then, the workers ride an aerial work platform to the hinge support to accurately align the pin holes of the upper and lower support plates and insert the pins to install the stop plate. Step 5: Connect, adjust, and position the straight section and Y-shaped section of the steel column; In step five, after the straight section of the steel column is installed, a crane or hand-operated hoist is used to lift the straight section of the steel column towards the Y-shaped section. Once it reaches the upper side of the Y-shaped section, the lifting rope is slowly adjusted to ensure that the lower end of the straight section of the steel column is accurately aligned with the upper end of the Y-shaped section. If there is any deviation, the Y-shaped section of the steel column is finely adjusted. At the same time, the overall alignment of the steel column is re-measured to ensure that the lower end of the straight section of the steel column is precisely aligned with the upper end of the Y-shaped section and that the overall alignment of the steel column is straight. After adjustment, the bottom seam of the Y-shaped section of the steel column is fully welded and fixed, and a positioning plate is set at the top to facilitate subsequent installation. Step Six: Temporarily dismantle the connection between the straight section and the Y-shaped section of the steel column; Step 7: Fill the lower part of the steel column with concrete and pour it. Step 8: Welding the straight section and the Y-shaped section of the steel column: In step eight, after the concrete filling of the Y-shaped section of the steel column is poured and cured to the design strength, the straight section of the steel column is connected according to the method in step five. After re-measurement and adjustment, the lower end of the straight section of the steel column is precisely connected with the upper end of the Y-shaped section of the steel column, and the overall line of the steel column is straight. Then, the joint welding is performed.

2. The method for installing Y-shaped steel bridge piers as described in claim 1, characterized in that: In step one, during the construction of the pier cap, the steel column pre-embedded sections and pre-embedded steel plates are installed. After the steel column pre-embedded sections are installed, the plane position and elevation should be re-measured before concrete pouring. If the adjustment is correct, the pier cap concrete should be reliably fixed before the pier cap concrete is poured. After the pier cap concrete is poured and cured to the design strength, the upper piers and steel box girders are installed.

3. The method for installing Y-shaped steel bridge piers as described in claim 1, characterized in that: In step two, the pre-embedded section of the steel column is re-measured before installation, and the installation axis is laid out. The Y-shaped section of the steel column is hoisted into place by a crane. The top plane position and elevation are re-measured and adjusted. Then, a set of plates are used to spot weld and fix the bottom joint in the circumferential direction.

4. The method for installing Y-shaped steel bridge piers as described in claim 1, characterized in that: In step three, a crane is used to hoist the steel box girder into place. The plane position and elevation of the steel box girder bridge deck are measured and positioned. After precise adjustment, both ends of the steel box girder are placed on temporary supports.

5. The method for installing Y-shaped steel bridge piers as described in claim 1, characterized in that: In step six, after the straight section and Y-shaped section of the steel column are connected, adjusted, and positioned, they are temporarily dismantled to allow for the pouring of concrete to fill the lower part of the Y-shaped steel column.

6. The method for installing Y-shaped steel bridge piers as described in claim 1, characterized in that: In step seven, concrete is poured to fill the Y-shaped section of the steel column. After the pouring is completed and cured to the design strength, the next installation procedure is carried out.

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