Device for relative sliding of formwork for casting reinforced concrete approach bridge and main bridge end cross beam

Abstract

The invention discloses a device for the relative sliding of a formwork for casting a reinforced concrete approach bridge and a main bridge end crossbeam, which comprises a bracket that supports the formwork upward from the foundation. The bracket extends above the end crossbeam. A bottom steel plate is fixed on the top surface of the end crossbeam. Multiple pairs of limiting round steel bars are fixed on the upper surface of the bottom steel plate, and a rolling round steel bar is in rolling fit. A bracket support steel plate is arranged on the top surfaces of multiple rolling round steel bars. The bracket extending above the end crossbeam is fixed on the bracket support steel plate. The longitudinal displacement of the end crossbeam caused by temperature change in a through-type steel truss arch bridge drives the bottom steel plate and multiple pairs of small-diameter limiting round steel bars to displace in the length direction of the arch bridge, thereby driving the rolling round steel bar to roll relative to the bracket support steel plate, so that the bracket and the formwork remain stationary while the end crossbeam longitudinally slides relative to the bracket support steel plate. This sliding device can compensate for the longitudinal displacement caused by temperature change in the steel truss arch bridge to prevent the longitudinal displacement of the end crossbeam during the construction process from causing the formwork support to tilt or even overturn.

Description

Technical Field

[0001] The present invention relates to the technical field of the construction of a through steel truss arch bridge, and more specifically, to a device for the relative sliding of the formwork for pouring the reinforced concrete approach bridge and the end cross beam of the main bridge. Background Art

[0002] The construction of a through steel truss arch bridge is a relatively common existing technology. After the construction of the main bridge is completed, generally, to prevent the uncertainty of construction caused by both ends being free ends, one end of the through steel truss arch bridge is relatively fixed to the ground through a pier, and the other end is a free end. For subsequent construction, a full hall type scaffolding or bracket is used at one end at a time to support the formwork for pouring the reinforced concrete of the approach bridge by using the end cross beam and the ground.

[0003] In the actual construction process, it generally takes several days from the erection of the formwork to the dismantling of the scaffold and the removal of the formwork after pouring. There is generally a temperature difference between day and night. Especially in some areas with large temperature differences between day and night, if it encounters a season with a large temperature difference, such as summer in Xinjiang and other regions, the temperature difference between day and night can sometimes reach about 20°C. In this way, there has always been a technical problem. It is a common phenomenon that the end cross beam at the free end generates displacement along the length direction due to the temperature change of thermal expansion and contraction in a through steel truss arch bridge hundreds of meters long. For example, sometimes this displacement can reach 4 - 6 cm. This kind of displacement or longitudinal deformation may cause the full hall type scaffolding or bracket to tilt or even overturn in actual construction. In the light case, it may cause the formwork to shift, thus affecting the pouring quality of the reinforced concrete of the approach bridge. In the serious case, it may leave potential safety hazards and even endanger the construction safety.

[0004] To prevent the above phenomena from occurring, the existing technology generally takes measures such as doubling the supports, such as adding inclined supports, or doubling the reinforcement of the full hall type scaffolding. One is that it greatly increases the construction materials, labor costs and workload, reduces the construction efficiency, and the other is that sometimes it is still difficult to fundamentally solve the above technical problems.

[0005] Some simply avoid this technical problem and directly use prefabricated components to replace the on-site poured reinforced concrete of the approach bridge. However, construction practice has proved that the on-site poured reinforced concrete of the approach bridge is superior to the use of prefabricated components.

[0006] Construction practice urgently needs to improve the above existing technology. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a device for the relative sliding of the formwork for pouring the reinforced concrete approach bridge and the end cross beam of the main bridge, which can compensate for the longitudinal displacement caused by temperature change in the through steel truss arch bridge to prevent the longitudinal displacement of the end cross beam during the construction process, so as to avoid the formwork support from tilting or even overturning.

[0008] The technical solution of the present invention is to provide a device for the relative sliding of the formwork for casting a reinforced concrete approach bridge and the main bridge end cross beam, including a support for supporting the formwork upward from the foundation, the support extending above the end cross beam, a bottom steel plate fixed on the top surface of the end cross beam, and a plurality of pairs of small-diameter limiting round steel fixed on the upper surface of the bottom steel plate. A large-diameter rolling round steel is rollingly fitted in the space formed by each pair of parallel small-diameter limiting round steel and the upper surface of the bottom steel plate. Each rolling round steel and each pair of limiting round steel are parallel to the longitudinal end face of the end cross beam. A support steel plate is provided on the top surfaces of the plurality of rolling round steels, and the support extending above the end cross beam is fixed on the support steel plate. The longitudinal displacement of the end cross beam caused by temperature change in the through-type steel truss arch bridge drives the bottom steel plate and the plurality of pairs of small-diameter limiting round steel to displace in the length direction of the arch bridge, thereby driving the rolling round steel to roll relative to the support steel plate, so that the support and the formwork remain stationary while the end cross beam longitudinally slides relative to the support steel plate.

[0009] After adopting the above structure, the device for the relative sliding of the formwork for casting a reinforced concrete approach bridge and the main bridge end cross beam of the present invention has the following advantages: Since the longitudinal displacement of the end cross beam caused by temperature change in the through-type steel truss arch bridge drives the bottom steel plate and the plurality of pairs of small-diameter limiting round steel to displace in the length direction of the arch bridge, thereby driving the rolling round steel to roll relative to the support steel plate, the support and the formwork remain stationary while the end cross beam longitudinally slides or slips relative to the support steel plate, which can compensate for the longitudinal displacement caused by temperature change in the through-type steel truss arch bridge to prevent the longitudinal displacement of the end cross beam during the construction process from causing the formwork support to tilt or even overturn. That is, even if the end cross beam has displacement or longitudinal deformation due to temperature change, due to the relative sliding of this sliding device, it will not cause the support or full hall scaffolding to tilt, and there will be no phenomenon of the support or full hall scaffolding overturning, which can ensure that the formwork does not shift, thereby effectively ensuring the casting quality of the reinforced concrete of the approach bridge, avoiding potential safety hazards, and preventing the occurrence of phenomena that endanger construction safety.

[0010] Furthermore, both ends of each rolling round steel and each pair of limiting round steel extend to both sides of the width of the end cross beam, the width of the bottom steel plate, and the width of the support steel plate. After adopting the above structure, the sliding area of the end cross beam relative to the support steel plate is larger, further ensuring that the formwork does not shift, thereby effectively ensuring the casting quality of the reinforced concrete of the approach bridge, avoiding potential safety hazards, and preventing the occurrence of phenomena that endanger construction safety.

[0011] Furthermore, a longitudinal displacement gap is left between the end face of the end cross beam and the support for supporting the formwork upward from the foundation. After adopting the above structure, it further ensures that the formwork does not shift, thereby effectively ensuring the casting quality of the reinforced concrete of the approach bridge, avoiding potential safety hazards, and preventing the occurrence of phenomena that endanger construction safety.

[0012] Furthermore, a limiting structure for preventing the longitudinal outward movement of the support steel plate of the support is fixed at the longitudinal outer end of the bottom steel plate. After adopting the above structure, on the premise that the support steel plate of the support generally does not displace under the self-weight pressure of the formwork and the support, an additional double insurance is provided, further ensuring the technical effect that the support steel plate of the support, the support and the formwork do not move.

[0013] Furthermore, a plurality of rectangular steel blocks distributed at intervals are fixed at the longitudinal outer end of the bottom steel plate. The height dimension of the rectangular steel block is smaller than the diameter dimension of the rolling round steel. A corresponding triangular steel block is detachably fixed to the inner side surface of the rectangular steel block. The inner inclined surface of the triangular steel block is the limiting surface for the outer end of the support steel plate. After the limiting structure for preventing the longitudinal outward movement of the support steel plate of the support adopts the above specific structure, the limiting effect is stable and reliable, and when disassembling, only the triangular steel block needs to be disassembled, and then the support steel plate can be pulled out outward, and the large-diameter rolling round steel and the small-diameter limiting round steel can be disassembled. Its specific limiting structure is simple, and both installation and disassembly are convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the application of the sliding device of the present invention in the formwork construction process of pouring the concrete approach bridge of the lower chord steel truss arch bridge. Figure 1 .

[0015] Figure 2 is [[ID=…]] Figure 1 the enlarged structural schematic diagram of A in

[0016] Figure 3 is Figure 2 the enlarged structural schematic diagram of B in

[0017] Figure 4 is a schematic structural diagram of the application of the sliding device of the present invention in the formwork construction process of pouring the concrete approach bridge of the lower chord steel truss arch bridge. Figure 2 .

[0018] Figure 5 is Figure 4 the enlarged structural schematic diagram of C in

[0019] Figure 6 is a schematic structural diagram of the application of the sliding device of the present invention in the formwork construction process of pouring the concrete approach bridge of the lower chord steel truss arch bridge. Figure 3 .

[0020] Figure 7 is Figure 6 the enlarged structural schematic diagram of D in

[0021] As shown in the figure: 1. Through - type steel truss arch bridge; 2. Pier; 3. Foundation; 4. Support; 5. Formwork; 6. End cross - beam; 7. Limit round steel; 8. Rolling round steel; 9. Column; 10. Cross - bar; 11. Support - supporting steel plate; 12. Rectangular steel block; 13. End face; 14. Triangular steel block; 15. Bottom steel plate; 16. Gap. Specific embodiments

[0022] The following further describes the specific embodiments of the present invention with reference to the accompanying drawings. It should be noted here that the description of these specific embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical means involved in the following specific embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0023] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 shown.

[0024] The construction of the through - type steel truss arch bridge 1 is a common existing technology. After the main bridge construction is completed, generally, to prevent the uncertainty of construction caused by both ends being free ends, one end of the through - type steel truss arch bridge 1 is relatively fixed to the foundation 3 through the pier 2, and the other end is a free end. Then, the end cross - beam 6 and the foundation 3 are used to build a full - hall scaffold to support the formwork 5 one end at a time to pour the reinforced concrete of the approach bridge. The full - hall scaffold is also called the support 4.

[0025] Limited by 25 characters, the name of the present invention is a device for relative sliding of the formwork for pouring the reinforced concrete approach bridge and the main - bridge end cross - beam. In detail, it can be: a device for relative sliding of the support 4 and the formwork 5 for pouring the reinforced concrete approach bridge of the through - type steel truss arch bridge 1 and the main - bridge end cross - beam 6.

[0026] Device for relative sliding of formwork for casting reinforced concrete approach bridge and main bridge end crossbeam, comprising a support 4 that supports the formwork 5 upward from the foundation 3. The support 4 extends above the end crossbeam 6. On the top surface of the end crossbeam 6, a bottom steel plate 15 is fixed, such as by welding or screwing with multiple countersunk screws. On the upper surface of the bottom steel plate 15, multiple pairs of small-diameter limiting round steel bars 7 are fixed. In the space formed between each pair, that is, every two mutually parallel small-diameter limiting round steel bars 7 and the upper surface of the bottom steel plate 15, a large-diameter rolling round steel bar 8 is in rolling fit. Each rolling round steel bar 8 and each pair of limiting round steel bars 7 are parallel to the longitudinal end face 13 of the end crossbeam 6. On the top surfaces of multiple rolling round steel bars 8, there is a support steel plate 11 for the support. The support 4 that extends above the end crossbeam 6 is fixed on the support steel plate 11 for the support. The longitudinal displacement of the end crossbeam 6 caused by temperature change of the through-type steel truss arch bridge 1 drives the bottom steel plate 15 and multiple pairs of small-diameter limiting round steel bars 7 to displace in the length direction of the arch bridge, that is, the through-type steel truss arch bridge 1, thereby driving the rolling round steel bars 8 to roll relative to the support steel plate 11 for the support, causing the support 4 and the formwork 5 to remain stationary while the end crossbeam 6 longitudinally slides relative to the support steel plate 11 for the support. Here, the longitudinal sliding can also be called longitudinal slipping.

[0027] The support 4 that extends above the end crossbeam 6 is fixed on the support steel plate 11 for the support. Generally, the columns 9 of the support 4 are fixed on the support steel plate 11 for the support, or the crossbars 10 of the support 4 can be fixed on the support steel plate 11 for the support, or both the columns 9 and the crossbars 10 can be fixed on the support steel plate 11 for the support. Of course, preferably, the columns 9 of the support 4 are fixed on the support steel plate 11 for the support, and the fixing is, for example, spot welding.

[0028] Both ends of each rolling round steel bar 8 and each pair of limiting round steel bars 7 extend to both sides of the width of the end crossbeam 6, the width of the bottom steel plate 15, and the width of the support steel plate 11 for the support. For example, both end faces of each rolling round steel bar 8 and both end faces of each limiting round steel bar 7 are flush with both side faces of the end crossbeam 6, both side faces of the bottom steel plate 15, and both side faces of the support steel plate 11 for the support. For example, Figure 3 As shown in, the front end face of each rolling round steel bar 8 and the front end face of each limiting round steel bar 7 are in the same vertical plane as the front side face of the end crossbeam 6, the front side face of the bottom steel plate 15, and the front side face of the support steel plate 11 for the support. Figure 5 As shown in, the rear end face of each rolling round steel bar 8 and the rear end face of each limiting round steel bar 7 are in the same vertical plane as the rear side face of the end crossbeam 6, the rear side face of the bottom steel plate 15, and the rear side face of the support steel plate 11 for the support.

[0029] A longitudinal displacement gap 16 is left between the end face 13 of the end crossbeam 6 and the support 4 that supports the formwork 5 upward from the foundation 3.

[0030] A limiting structure for preventing the longitudinal outward movement of the support steel plate 11 for the support is fixed at the longitudinal outer end of the bottom steel plate 15.

[0031] The described limiting structure can be a specific structure as follows: Multiple rectangular steel blocks 12 distributed at intervals are fixed to the longitudinal outer end of the bottom steel plate 15. The height dimension of the rectangular steel block 12 is smaller than the diameter dimension of the rolling round steel 8. The inner side surfaces of the rectangular steel blocks 12 are detachably fixed with corresponding triangular steel blocks 14 one by one. The inner inclined surface of the triangular steel block 14 is the limiting surface for the outer end of the support steel plate 11 of the bracket. It is not difficult to understand that the one-to-one correspondence here means that the rectangular steel blocks 12 and the triangular steel blocks 14 are in one-to-one correspondence. After the construction is completed, the triangular steel blocks 14 are disassembled, such as by oxy-cutting the spot welding points. The rectangular steel blocks 12 can also be disassembled, such as by screwing out the locking screws.

[0032] The described limiting structure can be another specific structure as follows: Multiple triangular steel blocks distributed at intervals are detachably fixed to the longitudinal outer end of the bottom steel plate, such as by screw connection. The inner inclined surface of the triangular steel block is the limiting surface for the outer end of the support steel plate of the bracket. After the construction is completed, the triangular steel blocks are disassembled, such as by oxy-cutting the spot welding points or by screwing out the locking screws.

[0033] The described limiting structure can be yet another specific structure as follows: Multiple longitudinally limited rectangular steel blocks are hinged to the outer end surface of the bottom steel plate via their respective screws. When the steel blocks rotate 180°, the upward protruding parts play a role in longitudinally limiting the outer end of the support steel plate of the bracket. At this time, the screws are tightened. After the construction is completed, the screws can be loosened so that the upward protrusions do not rotate 180° but droop to release the longitudinal limit on the support steel plate of the bracket, or the locking screws can be screwed out to disassemble the rectangular steel blocks.

[0034] It is not difficult to understand that the technical solution of several rolling steel balls in the space formed by each pair of mutually parallel small-diameter limiting round steel and the upper surface of the bottom steel plate is also within the protection scope of the present invention. The diameter of the steel balls is larger than the diameter of the small-diameter limiting round steel. When using rolling steel balls, there are limiting baffles for the rolling steel balls at both ends of each pair of limiting round steel to prevent the steel balls from falling off.

[0035] The above front-back and other azimuth nouns are for convenience of description rather than limitation. The parts, structures, or quantities not marked above are not shown in the drawings. The drawings are only schematic. If there are inconsistencies between the drawings and the text description, or inconsistencies among the drawings themselves, the text description shall prevail.

[0036] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A device for relative sliding of the formwork for casting a reinforced concrete approach bridge and the main bridge end cross beam, comprising a support for supporting the formwork upward from the foundation, characterized in that: The described bracket extends above the end crossbeam. A bottom steel plate is fixed on the top surface of the end crossbeam. Multiple pairs of small-diameter limiting round steel bars are fixed on the upper surface of the bottom steel plate. A large-diameter rolling round steel bar is in rolling fit in the space formed between each pair of parallel small-diameter limiting round steel bars and the upper surface of the bottom steel plate. Each rolling round steel bar and each pair of limiting round steel bars are parallel to the longitudinal end face of the end crossbeam. A bracket support steel plate is on the top surfaces of multiple rolling round steel bars. The bracket extending above the end crossbeam is fixed on the bracket support steel plate. The longitudinal displacement of the end crossbeam caused by temperature change in the through-type steel truss arch bridge drives the bottom steel plate and multiple pairs of small-diameter limiting round steel bars to displace in the length direction of the arch bridge, thereby driving the rolling round steel bars to roll relative to the bracket support steel plate, so that the bracket and the formwork remain stationary while the end crossbeam longitudinally slides relative to the bracket support steel plate.

2. The device for relative sliding of the formwork for casting the reinforced concrete approach bridge and the main bridge end cross beam according to claim 1, characterized in that: Both ends of each rolling round steel bar and each pair of limiting round steel bars extend to both sides of the width of the end crossbeam, the width of the bottom steel plate, and the width of the bracket support steel plate.

3. The device for relative sliding of the formwork for casting the reinforced concrete approach bridge and the main bridge end cross beam according to claim 1, characterized in that: A longitudinal displacement gap is left between the end face of the end crossbeam and the bracket that supports the formwork upward from the foundation.

4. The device for relative sliding of the formwork for casting the reinforced concrete approach bridge and the main bridge end cross beam according to claim 1, characterized in that: A limiting structure for preventing the longitudinal outward movement of the bracket support steel plate is fixed at the longitudinal outer end of the bottom steel plate.

5. The device for relative sliding of the formwork for casting the reinforced concrete approach bridge and the main bridge end cross beam according to claim 4, characterized in that: Multiple spaced rectangular steel blocks are fixed at the longitudinal outer end of the bottom steel plate. The height dimension of the rectangular steel blocks is smaller than the diameter dimension of the rolling round steel bars. Triangular steel blocks corresponding one by one are detachably fixed on the inner side surfaces of the rectangular steel blocks. The inner inclined surface of the triangular steel blocks is the limiting surface for the outer end of the bracket support steel plate.

Images