A positioning and installation device for assembled segmental box beam

Abstract

The invention discloses a positioning and installation device for an assembled segmental box girder, comprising four concrete blocks arranged at the four corners of the box girder chamber, two sets of vertical telescopic devices and two sets of transverse telescopic devices; wherein the two vertical screw steel pipes of the vertical telescopic device are connected by a vertical screw steel sleeve matched therewith, so as to realize the telescopic operation of the screw rod by rotating the sleeve; a steel plate is welded to the other end of the lower vertical screw steel pipe; the other end of the upper vertical screw steel pipe is connected to the steel pipe through a hydraulic device; a steel plate is also welded to the other end of the steel pipe; wherein the transverse telescopic device is similar to the vertical telescopic device, and its two transverse screw steel pipes are connected by a transverse screw steel sleeve matched therewith, and a steel plate is respectively welded to the other end of the transverse screw steel pipe. The invention has a simple structure, the components can be prefabricated, the material cost is low, and the segmental box girder can be quickly positioned and installed.

Description

Technical Field

[0001] The invention belongs to bridge engineering, and in particular relates to a positioning and installation device for an assembled segmental box girder. Background Art

[0002] As the application of segmental prefabricated bridges in my country becomes more and more widespread, segmental assembled bridges begin to appear in the construction of long-span railway bridges, which puts higher requirements on the connection of segmental beam joints. At the segmental beam assembly joints, due to the discontinuous structure at the joints, shear key teeth are required to provide shear bearing capacity, and the bridge is made into a whole through the bite between the key teeth. The traditional segmental beam shear key teeth are cast when the beam segments are matched and prefabricated, and their production precision is required to be high. Due to the size of the key teeth, they are easy to be bumped and damaged during transportation and installation, which increases the transportation cost and technical difficulty during assembly. In the segmental beam hoisting construction, most of the existing positioning technologies use manual positioning with a level, which is cumbersome. The existing shear key tooth bearing capacity calculation is unclear, and the shear performance of the key teeth is difficult to guarantee in large-span railway bridges. Therefore, it is necessary to find a segmental beam joint connection and shear device that can be prefabricated, easy to install, can replace the traditional shear key teeth, and help the segment assembly construction positioning. Summary of the invention

[0003] In order to achieve the above-mentioned purpose, the present invention provides a positioning and installation device for an assembled segmental box girder.

[0004] The invention discloses a positioning and installation device for an assembled segmental box beam, comprising four concrete blocks arranged at four corners of a box beam chamber, two sets of vertical telescopic devices and two sets of horizontal telescopic devices.

[0005] Among them, the two vertical screw steel pipes of the vertical telescopic device are connected by the matching vertical screw steel sleeve. The screw directions at the upper and lower ends of the screw steel sleeve should be opposite to realize the rotation of the sleeve to make the screw rod telescopic. The cross section of the sleeve should be square outside and round inside to facilitate mechanical clamping and rotation. The screw direction at the joint between the screw rod and the steel sleeve should be consistent with the screw direction of the steel sleeve. The other end of the lower vertical screw steel pipe is welded with a steel plate; the other end of the upper vertical screw steel pipe is connected to the steel pipe through a hydraulic device; a steel plate is also welded to the other end of the steel pipe.

[0006] Among them, the horizontal telescopic device is similar to the vertical telescopic device, and its two horizontal screw steel pipes are connected by a matching horizontal screw steel sleeve, and a steel plate is welded at the other end of the horizontal screw steel pipe.

[0007] Furthermore, the dimensions of the concrete blocks correspond to the installation positions of the four corners of the box beam chamber; and holes for steel bars are reserved on the concrete blocks.

[0008] Furthermore, a rubber pad is provided between the steel plate and the concrete block to meet the rotation requirement during the adjustment and positioning process.

[0009] Furthermore, angle steel is welded between the steel plate and the steel pipe as a diagonal brace.

[0010] Furthermore, steel bars corresponding to the perforations are embedded in the box beam chamber, and the diameter of the steel bars is smaller than the diameter of the perforations, so as to facilitate the steel bars to penetrate the perforations of the concrete block. There are centering marks on the top plate of the box beam, which are used to ensure the approximate fit of the box beam during assembly and to check the assembly accuracy of the box beam.

[0011] Further, concrete is included for sealing the perforations.

[0012] Furthermore, the contact surface between the concrete block and the installation location may be coated with glue.

[0013] The beneficial technical effects of the present invention compared with the prior art are:

[0014] The present invention separates the shear connection structure of the segmental box beam joint from the segmental beam body and prefabricates it separately to achieve the purpose of standardized factory production, eliminating the process of casting key teeth when prefabricating the segmental beam. At the same time, the device is easy to install and can help the segment assembly and positioning. By adjusting the expansion and contraction of the device, the box beam joint section displacement is helped to reset, which greatly reduces the difficulty of assembly construction and effectively connects the segmental beam into a whole. The device is not only suitable for ordinary segment prefabricated assembly bridges, but also can be used for large-span segment assembly railway bridges, as well as the connection and positioning of submarine tunnel caisson structures. In general, the present invention has a simple structure, the components can be prefabricated, the material cost is low, and the segmental box beam can be quickly positioned and installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of a positioning and installation device for an assembled segmental box girder of the present invention;

[0016] Figure 2 It is a side view of a positioning and installation device for an assembled segmental box girder of the present invention;

[0017] Figure 3 is a top view of a concrete block in the device of the present invention;

[0018] Figure 4 It is a cross-sectional schematic diagram of the screw steel sleeve structure;

[0019] Figure 5 yes Figure 4 Schematic diagram of the cross section at AA in the middle;

[0020] Figure 6 It is a schematic diagram of the structure of the reserved steel bars at the four corners of the box girder chamber at the joint of the segment box girder;

[0021] Figure 7 This is a schematic diagram of the centering mark of the top plate of the segmental box girder;

[0022] Figure 8 This is a schematic diagram of top plate centering during segment box girder hoisting;

[0023] Fig. 9 It is a schematic diagram of the cross section of the steel bar after it penetrates the hole in the concrete block;

[0024] Fig.10 is a schematic diagram of the cross section of the perforation after the gap inside the perforation is sealed with concrete;

[0025] Fig.11 It is a vertical view of a positioning and installation device of an assembled segmental box girder of the present invention after being fixed in a box girder box chamber;

[0026] Fig.12 yes Fig.11 Schematic diagram of the middle BB section;

[0027] Fig.13 It is a schematic elevation diagram of the joint connection after the concrete blocks are installed and the device is removed;

[0028] Fig.14 yes Fig.13 Schematic diagram of the CC section. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, a positioning and installation device for an assembled segmental box girder of the present invention comprises four high-strength concrete blocks 1 that fit into the installation positions 10 at the four corners of the box girder chamber, and the two ends of the concrete blocks 1 have reserved holes 12 for high-strength coarse steel bars. A steel plate 2 is used to support the concrete block 1, and the steel plate 2 is welded to both ends of the vertical telescopic device and the horizontal telescopic device. A rubber pad 3 is arranged between the concrete block 1 and the steel plate 2. The two vertical screw steel pipes 4 of the vertical telescopic device are connected by a vertical screw steel sleeve 5 that matches therewith, and the other end of the lower vertical screw steel pipe 4 is welded to the steel plate 2; the other end of the upper vertical screw steel pipe 4 is connected to the steel pipe 15 through the hydraulic device 6; and a steel plate 2 is also welded to the other end of the steel pipe 15. The two horizontal screw steel pipes 8 of the horizontal telescopic device are connected by a horizontal screw steel sleeve 9 that matches therewith, and a steel plate 2 is respectively welded to the other end of the horizontal screw steel pipe 8.

[0031] like Figure 4 and Figure 5As shown, the cross section of the screw steel sleeve 5 is square outside and round inside, which is convenient for clamping by tools. Screws are distributed on the inner walls of both ends of the sleeve, and the screws at both ends are in opposite directions. When the sleeve rotates, the extension and shortening of the screw can be achieved.

[0032] like Figure 6 As shown, the structure and size of the four concrete block installation positions 10 at the four corners of the box beam box chamber are consistent with the structure and size of the concrete block. The installation position 10 can be coated with glue, and there are pre-embedded steel bars 11 at the installation position that are consistent with the position of the steel bar perforations 12 on the concrete block.

[0033] like Figure 7 , Figure 8 and Fig.11 As shown, when the box beam is hoisted, the centering mark 13 of the top plate of the box beam is first compared to make the top plate of the box beam roughly aligned, and then the hoisting equipment is controlled to make the cross section of the bottom plate of the box beam fit, so that the cross section of the box beam is roughly aligned, but there is still torsional displacement. At this time, the device of the present invention can be used to adjust the positioning of the box beam to align the joints of the two sections of the torsional displacement beam.

[0034] like Fig. 9 , Fig.10 and Fig.12 As shown, the adjustment and positioning steps are as follows: the vertical device of the present invention is roughly placed with the concrete block 1 at the installation position 10, the contact surface between the installation position 10 and the concrete block 1 can be coated with glue, and the reserved steel bar perforation 12 of the concrete block must be inserted into the pre-buried steel bar 11. Then, the left-side device hydraulic device 6 is first used to extend the left-side device to a certain length, and then the right-side hydraulic device 6 is used to extend the right-side device to a certain length, and the left and right adjustments are repeated. When the vertical device is tightened, the box beam positioning is roughly adjusted. Then the horizontal device is installed, and the box beam positioning is finely adjusted by twisting the screw steel sleeve 9 of the horizontal device and the screw steel sleeve 5 of the vertical device in turn, and the deviation of the three centering marks 13 above the top plate at the box beam joint is measured. When the error meets the engineering requirements, the box beam is positioned. The gap between the reserved perforation 12 of the concrete block and the inserted high-strength coarse steel bar 11 is sealed with high-strength concrete 14. After the sealed concrete 14 solidifies, the concrete block 1 is bonded to the high-strength coarse steel bar 11, the segment beam connection key is installed, and the device of the present invention can be removed. When dismantling the device, first rotate the screw sleeve 9 of the horizontal device to loosen and dismantle the horizontal device, then release the pressure of the hydraulic device 6 of the vertical device to complete the dismantling of the device.

[0035] like Fig.13 and Fig.14 As shown, after the device of the present invention is dismantled, the high-strength concrete block 1 and the pre-embedded high-strength coarse steel bars 11 cooperate to form the segment beam connection key, completing the box beam joint connection.

[0036] The present invention has a simple structure, the components can be prefabricated, the material cost is low, and the difficulty of hoisting and positioning the segment beam can be greatly reduced. The present invention has good force performance, can effectively connect the segment beams into a whole, and can provide reliable shear bearing capacity at the joints. The present invention can be applied to segment assembly railway bridges with large spans, and can also be used for the positioning and connection of immersed tube segments.

[0037] The above description is only to illustrate some principles of the assembled segmental box girder connecting key and the matching retractable and detachable box girder positioning and connecting key installation device of the present invention, and is not intended to limit the present invention to the specific structure and applicable scope shown and described. Therefore, all corresponding modifications and equivalents that may be used are within the scope of the patent applied for by the present invention.

Claims

1. A positioning and installation device for an assembled segmental box girder, characterized in that: The invention comprises four concrete blocks (1) arranged at the four corners of the box beam chamber, two sets of vertical telescopic devices and two sets of horizontal telescopic devices; the four concrete blocks (1) and the horizontal and vertical telescopic devices are connected in sequence to form a square shape; a steel plate (2) for supporting the concrete blocks (1) is also arranged between the concrete blocks (1) and the horizontal and vertical telescopic devices, and the steel plate (2) is welded to both ends of the vertical telescopic device and the horizontal telescopic device; The concrete block (1) corresponds to the size of the installation positions (10) at the four corners of the box beam chamber, and the concrete block (1) has reserved through holes (12) for high-strength coarse steel bars at both ends, and steel bars (11) corresponding to the through holes (12) are pre-buried in the box beam chamber; the steel bars (11) of two adjacent sections of the box beam are respectively inserted into the through holes (12) at both ends of the concrete block (1), and after the horizontal and vertical expansion devices are removed, the concrete block (1) and the pre-buried steel bars (11) cooperate to form a segment beam connection key, thereby completing the box beam joint connection; The two vertical screw steel pipes (4) of the vertical telescopic device are connected by a vertical screw steel sleeve (5) matched therewith; the other end of the lower vertical screw steel pipe (4) is welded to a steel plate (2); the other end of the upper vertical screw steel pipe (4) is connected to a steel pipe (15) via a hydraulic device (6); a steel plate (2) is also welded to the other end of the steel pipe (15); an angle steel (7) is welded between the steel plate (2) and the steel pipe (15) as a diagonal brace; The two transverse screw steel pipes (8) of the transverse telescopic device are connected by a matching transverse screw steel sleeve (9), and a steel plate (2) is welded to the other end of each transverse screw steel pipe (8).

2. The positioning and installation device for an assembled segmental box girder according to claim 1, characterized in that: A rubber pad (3) is provided between the steel plate (2) and the concrete block (1).

3. The positioning and installation device for an assembled segmental box girder according to claim 1, characterized in that: The diameter of the steel bar (11) is smaller than the diameter of the hole (12); and a centering mark (13) is provided on the top plate of the box beam.

4. The positioning and installation device for an assembled segmental box girder according to claim 1, characterized in that: Concrete (14) is also included for sealing the perforations (12).

5. The positioning and installation device for an assembled segmental box girder according to claim 1, characterized in that: The contact surface between the concrete block (1) and the installation position (10) is coated with glue.

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