Jack supporting structure for incremental launching construction of steel box girder

Abstract

The utility model discloses a jack supporting structure for steel box girder pushing construction. The jack supporting structure comprises a jack protection cushion block supported by the top face of the lifting end of a jack, a pushing bearing beam is supported by the jack protection cushion block, and a bearing beam cushion block is arranged at the top of the pushing bearing beam; the number of the bearing beam cushion blocks is multiple, and the height of the cushion layer is adjusted by increasing or decreasing the number of the bearing beam cushion blocks in the height direction. The upper-layer supporting assembly further comprises an upper plug cushion block used for supporting the bottom face of the steel box girder, and the upper plug cushion block supports the steel box girder through a bearing beam cushion block set arranged at the top of the pushing bearing beam. The upper plug cushion block comprises a base and a functional cushion layer, wherein the base is the same as the bearing beam cushion block in structure, and the functional cushion layer is arranged on the upper surface of the base and located between the base and the bottom face of the steel box beam. The use convenience of the auxiliary component for jacking and pushing of the jack is improved, the jacking and pushing quality of the steel box girder can be better guaranteed, and meanwhile the construction period and the construction cost are controllable.

Description

Technical Field

[0001] The utility model relates to the field of incremental launching construction of steel box girders, and particularly relates to a jack support structure for incremental launching construction of steel box girders. Background Technique

[0002] During the incremental launching construction of a steel box girder, when the oil cylinder in the synchronous jacking system is gradually lifted, due to the small contact area, under heavy load conditions, the stress on the contact surface of the oil cylinder is extremely large, which easily causes large deformation of the steel box girder structure above, thus posing a danger.

[0003] Whether above the elevation bearing or above the cushion beam, the structures directly in contact with the bottom plate of the steel box girder are hard structures such as steel plates; this easily causes the steel plates, etc. to directly squeeze the paint on the bottom plate of the steel box girder during incremental launching, resulting in problems such as deformation and peeling of the paint at the force-bearing part of the incremental launching, and serious rework in the later stage, leaving potential hazards for the long-term paint construction quality.

[0004] Moreover, to better ensure the quality of the jacking of the steel box girder by the jack, the jack is located above the temporary pier cushion beam. To ensure that the load on the bottom plate of the steel box girder can be promptly transferred to the pier column through the cushion beam, it is necessary to add cushion blocks between the cushion beam and the bottom plate of the steel box girder to reduce the height of the cushion beam or distribution beam, thereby improving the use stability of the jack. Generally, steel plates are used for padding, but in the actual operation process, the amount of steel plates used is very large, stacking or unloading is troublesome, and it is extremely easy to have the problem of loss, with extremely high material consumption and difficult to control the construction cost.

[0005] Therefore, to solve the above problems, a jack support structure for incremental launching construction of steel box girders is needed to improve the use convenience of the auxiliary components for jacking by the jack, better ensure the quality of incremental launching of the steel box girder, and at the same time, the construction period and construction cost are controllable. Content of the Utility Model

[0006] In view of this, the purpose of the utility model is to overcome the defects in the prior art, provide a jack support structure for incremental launching construction of steel box girders, improve the use convenience of the auxiliary components for jacking by the jack, better ensure the quality of incremental launching of the steel box girder, and at the same time, the construction period and construction cost are controllable.

[0007] The jack support structure for incremental launching construction of steel box girders of the utility model includes an upper support assembly; the upper support assembly includes a jack protection cushion block supported by the top surface of the lifting end of the jack. The jack protection cushion block includes a support cushion layer supported by the top surface of the lifting end of the jack and a limiting limb for limiting the lifting end of the jack. The support cushion layer is located between the top surface of the lifting end of the jack and the bottom surface of the incremental launching cushion beam. The limiting limb is connected to the bottom surface of the support cushion layer, and the limiting limb is several pieces evenly distributed circumferentially around the lifting end of the jack.

[0008] The upper support assembly further includes a jacking cushion beam and cushion beam pads. The jacking cushion beam is supported by the jack protection pads, and the cushion beam pads are arranged on the top of the jacking cushion beam. There are several cushion beam pads, and the height of the cushion layer is adjusted by increasing or decreasing the number of cushion beam pads in the height direction.

[0009] The upper support assembly further includes upper plugging pads for supporting the bottom surface of the steel box girder. The upper plugging pads form the support for the steel box girder through a set of cushion beam pads arranged on the top of the jacking cushion beam. The upper plugging pads include a base with the same structure as the cushion beam pads and a functional cushion layer arranged on the upper surface of the base. The functional cushion layer is located between the base and the bottom surface of the steel box girder, and the stiffness of the functional cushion layer is lower than that of the base.

[0010] Furthermore, a lower support assembly is also included. The lower support assembly includes flange column supports at preset positions. The jacks are supported by the flange column supports. There are several sections of flange column supports, and the support height of the jacks is adjusted by increasing or decreasing the number of flange column supports in the height direction.

[0011] Furthermore, the lower support assembly further includes temporary piers fixed at preset positions, transverse distribution beams supported by the temporary piers, and longitudinal distribution beams supported by the transverse distribution beams. The group of flange column supports supported by the jacks is supported by the longitudinal distribution beams.

[0012] Furthermore, the jacks supported by the group of flange column supports are located at the longitudinal middle of the longitudinal distribution beam.

[0013] Furthermore, the cushion beam pads include a top plate and several support ribs vertically connected to the bottom surface of the top plate. The several support ribs divide the bottom of the top plate into several force distribution areas, and the several force distribution areas converge towards the center of the horizontal plane of the top plate.

[0014] Furthermore, the functional cushion layer is a polytetrafluoroethylene plate fixed on the top surface of the top plate. The ratio of the thickness of the functional cushion layer to the thickness of the top plate is between 0.55 and 0.65.

[0015] Furthermore, the support cushion layer includes an upper cushion plate, a lower cushion plate, and connecting ribs. The upper cushion plate and the lower cushion plate are parallel. There are several connecting ribs, and the several connecting ribs are connected between the upper cushion plate and the lower cushion plate in a mutually perpendicular manner.

[0016] The bottom surface of the lower cushion plate is parallel to the horizontal plane. The top surface of the lower cushion plate is supported by the top surface of the lifting end of the jack, and the limiting limbs are vertically connected to the bottom surface of the lower cushion plate.

[0017] Furthermore, the several connecting ribs perpendicular to each other divide the area between the upper cushion plate and the lower cushion plate into several force transmission cavities with approximately equal sizes.

[0018] Furthermore, the center of the horizontal plane of the support cushion layer coincides vertically with the lifting center of the lifting end of the jack; the upper cushion plate and the lower cushion plate have the same structure and are connected by connecting ribs on the vertical projection where they overlap.

[0019] Furthermore, the upper cushion plate and the lower cushion plate are rectangular plates with the same structure. The support cushion layer further includes a reinforcing rib arranged near the center of the horizontal plane of the lower cushion plate; the reinforcing rib is perpendicular to the length direction of the lower cushion plate, and the top and bottom ends of the reinforcing rib along the width direction of the lower cushion plate are respectively connected to the adjacent connecting ribs corresponding to them.

[0020] There are several pieces of the reinforcing ribs, and the several pieces of the reinforcing ribs are arranged at intervals along the length direction of the lower cushion plate, and the projections of the several pieces of the reinforcing ribs on the length direction of the lower cushion plate overlap.

[0021] The beneficial effects of the present utility model are as follows: A jack support structure for the incremental launching construction of steel box girders disclosed by the present utility model can increase the force application area of the lifting end of the jack through the use of jack protection pads, disperse the load transmitted by the steel box girder, and improve the safety of the incremental launching construction of the steel box girder; the cushion beam pads are flexible in use and convenient to arrange, greatly improving the construction progress and quality of the incremental launching construction of the steel box girder, being able to meet the effective support of the cushion beam for the steel box girder, improving construction safety, and at the same time overcoming the problems of a large amount of steel plate usage, cumbersome stacking or unloading, and effectively controlling the construction cost; the purpose of using the upper plug pad is to reduce the hard direct contact between the bottom of the steel box girder and the incremental launching mechanism and the support structure, reduce the friction coefficient, improve the protection of the steel box girder during incremental launching, improve the integrity of the paint surface on the steel box girder during the incremental launching construction process, reduce the risk of paint deformation and peeling at the bottom of the steel box girder, improve the construction quality, and eliminate the step of post-construction paint repair, shortening the construction period. Description of the Drawings

[0022] The following further describes the present utility model in conjunction with the drawings and embodiments:

[0023] Figure 1 is a structural schematic diagram of the present utility model;

[0024] Figure 2 is a structural schematic diagram of the connection of the temporary pier, transverse distribution beam and longitudinal distribution beam of the present utility model;

[0025] Figure 3 is a structural schematic diagram of the cushion beam pad of the present utility model;

[0026] Figure 4 is for the present utility model Figure 3 bottom structural schematic diagram;

[0027] Figure 5 is a structural schematic diagram of the upper plug pad of the present utility model;

[0028] Figure 6 This is a schematic structural view of the protective cushion block of the jack of the present utility model;

[0029] Figure 7 For the present utility model Figure 6 front view structural schematic diagram;

[0030] Figure 8 For the present utility model Figure 7 structural schematic diagram in the A-A direction in the present utility model. Specific embodiments

[0031] Figure 1 This is a structural schematic diagram of the present utility model. As shown in the figure, the transverse direction is the direction in which the steel box girder spans the road, and the longitudinal direction is the direction of the jacking of the steel box girder. The jack support structure for the jacking construction of the steel box girder in this embodiment includes a lower support assembly. The lower support assembly includes a temporary pier 1 fixed at a preset position, a transverse distribution beam 2 supported by the temporary pier 1, and a longitudinal distribution beam 3 supported by the transverse distribution beam 2; the flange plate column group supported by the jack is supported by the longitudinal distribution beam.

[0032] It should be understood that there are several temporary piers 1 distributed transversely and longitudinally. The transverse distribution beam 2 is parallel to the transverse direction and is supported by several temporary piers 1. The transverse distribution beam 2 is several arranged at intervals longitudinally. The longitudinal distribution beam 3 is parallel to the longitudinal direction and is supported by several transverse distribution beams 2. The longitudinal distribution beam 3 is several arranged at intervals transversely; more specifically, to ensure the support reliability and uniform force dispersion of the jack 6 for jacking, and to ensure the reliability and stability of the jacking construction of the steel box girder 001, the longitudinal distribution beam 3 is located in the middle of the transverse direction of the transverse distribution beam 2 and is supported by the transverse distribution beam 2, or the longitudinal distribution beam 3 is located directly above the top of the temporary pier 1 and is supported by the transverse distribution beam 2; the structures and layout positions of the temporary pier 1, the transverse distribution beam 2, and the longitudinal distribution beam 3 shall be subject to the actual construction layout and will not be elaborated here.

[0033] Taking a group of local support structures as an example in this scheme, as Figure 2 shown, the four temporary piers 1 are distributed in a rectangular lattice. The four temporary piers 1 are fixed at a preset position and are connected circumferentially by a truss 4 to form a support body. The truss 4 connecting the four temporary piers 1 is arranged higher in the height direction to improve the reliability of the support structure. Two transverse distribution beams 2 parallel to the transverse direction are respectively supported by two adjacent temporary piers 1 transversely. The longitudinal distribution beam 3 parallel to the longitudinal direction is located in the middle of the transverse direction of the transverse distribution beam 2 and is supported by the two transverse distribution beams 2 to improve the structural stability and meet the jacking requirements of the steel box girder 001.

[0034] In this embodiment, it further includes an upper support assembly. The upper support assembly includes a cushion beam located between the steel box girder 001 to be jacked and the longitudinal distribution beam 3. The cushion beam is parallel to the transverse direction and is supported by several longitudinal distribution beams 3.

[0035] The cushion beam includes a jacking cushion beam 5 supported by a jack 6 at the longitudinal middle of the longitudinal distribution beam 3, a front support cushion beam 7 arranged near the longitudinal front end of the longitudinal distribution beam 3 on the front side of the jacking cushion beam 5, and a rear support cushion beam 8 arranged near the longitudinal rear end of the longitudinal distribution beam 3 on the rear side of the jacking cushion beam 5. More specifically, the front support cushion beam 7 is slightly forward in the longitudinal direction compared to the transverse distribution beam 2 that supports the longitudinal distribution beam 3 at its bottom and is arranged on the front side, and the rear support cushion beam 8 is slightly backward in the longitudinal direction compared to the transverse distribution beam 2 that supports the longitudinal distribution beam 3 at its bottom and is arranged on the rear side. This not only expands the longitudinal width of the supported steel box girder 001 but also improves the reliability of the support of the bottom support structure to the top support structure, greatly disperses the downward force transmission of the steel box girder 001, and improves the safety of the jacking construction of the steel box girder 001. The "front" herein refers to the advancing direction of the steel box girder 001 in the longitudinal direction, and the "rear" is opposite to the front direction in the longitudinal direction. Any one of the jacks 6 for jacking the steel box girder 001 is selected as the jack 6 to achieve the purpose of jacking construction of the steel box girder 001, and details are not described herein again.

[0036] In this embodiment, the lower support assembly further includes a flange column 9 supported by the longitudinal distribution beam 3. The flange column 9 has several sections, and the support height for the preset target is adjusted by increasing or decreasing in the height direction. It should be noted that due to factors such as the alignment and height of the steel box girder, the flange column may not be provided or the installation heights on each jacking support may be inconsistent, subject to the actual construction standards, and details are not described herein again.

[0037] This solution makes the flange column 9 into standard sections with appropriate section heights, improves the effectiveness and convenience of the turnover and use of components, and reduces the construction cost. The height of one section of the flange column 9 does not exceed the height of any one of the transverse distribution beam 2, longitudinal distribution beam 3, jacking cushion beam 5, front support cushion beam 7, and rear support cushion beam 8, avoiding the modification of the sizes of the distribution beam and cushion beam and reducing the construction cost.

[0038] The increase or decrease of the flange columns 9 on the same axis forms a group of flange column groups. The adjacent flange columns 9 in a group are fixed by bolts. By adjusting the preset target support height through the flange column group, there is no need to change the height of the standard pier column section, and there is no need to add auxiliary pier columns with corresponding heights on the standard section pier column, which can better meet the universality of the overall support structure of this solution. Especially in the case where the construction sites are relatively close, the construction cost can be greatly reduced; and the structure of not directly increasing the auxiliary pier column also reduces the support height of the pier column in the lower support structure, making the lower support structure more stable. The transverse distribution beam 2 and the longitudinal distribution beam 3 separate the structure of the columnar pier, which can further improve the stability of the support for the steel box girder 001, reduce the deformation of the stress weak area caused by the large force at the top of the pier column and the small force at the bottom, and improve the construction safety.

[0039] In this embodiment, the preset targets include the jacking cushion beam 5, the front support cushion beam 7 and / or the rear support cushion beam 8, so that the jacking cushion beam 5, the front support cushion beam 7 and the rear support cushion beam 8 are respectively adjusted to the preset height through their respective corresponding flange column groups; the meaning of "and / or" is that the flange column group can independently adjust one of the preset targets to a higher level, or can simultaneously adjust multiple preset targets to a higher level through the corresponding flange column groups. According to the actual construction situation, the jacking cushion beam 5, the front support cushion beam 7 and the rear support cushion beam 8 can be temporarily and flexibly adjusted to the preset height through their respective corresponding flange column groups to meet the construction requirements, which will not be elaborated here.

[0040] In this embodiment, the base of the jack 6 is arranged on the top of the flange column group that supports the jacking cushion beam 5, and the lifting end of the jack 6 supports the jacking cushion beam 5;

[0041] In this solution, the jacking cushion beam 5, the front support cushion beam 7 and the rear support cushion beam 8 are respectively adjusted to the preset height through their respective corresponding flange column groups; more specifically, the jacking cushion beam 5 is supported by the flange column group Ⅰ in the longitudinal middle of the longitudinal distribution beam 3. The flange column group Ⅰ that supports the jack 6 is two groups distributed in the longitudinal middle of the longitudinal distribution beam 3 to meet the requirements of the jack 6 for jacking and stepping construction; the front support cushion beam 7 is supported by the flange column group Ⅱ at the longitudinal front end of the longitudinal distribution beam 3; the rear support cushion beam 8 is supported by the flange column group Ⅲ at the longitudinal rear end of the longitudinal distribution beam 3;

[0042] And the heights of the front support cushion beam 7 and the rear support cushion beam 8 are the same, and the jack 6 is supported to the preset height, so as to meet the requirement of a shorter jacking stroke of the jack 6 and meet the stability requirement of the jack 6 for jacking the steel box girder 001 through the jacking cushion beam 5;

[0043] The use of the flange column group can solve the problem of insufficient support height of the pier column in the elevation section. At the same time, there is no need to adjust the height of the distribution beam and the cushion beam, and it can flexibly meet the support requirements for the steel box girder 001 with a preset height; all components used for the jacking support of the entire steel box girder 001 can be recycled, reducing the construction cost, and can more conveniently and reliably meet the construction requirements in the later high-position beam lowering construction steps, improving the construction quality; more specifically, in the jacking construction of the steel box girder without high-position beam lowering, if the use of the elevation column can meet the jacking requirements, there is no need to set the flange column. If the recycled elevation column cannot meet the preset use height, or the elevation of the existing structure exceeds the preset assembly height of the bridge to be constructed during the jacking construction and subsequent high-position beam lowering is required, the setting of the flange column group is particularly effective. The lifting height of the steel box girder can be controlled, and the steel box girder can complete the high-position beam lowering more stably, improving the construction quality. Or the flange column can also be used to raise a low-lying structure somewhere, that is, the setting of the flange column should be suitable for reliable, effective and convenient construction, which will not be elaborated here.

[0044] In this embodiment, the upper support assembly further includes a jack protection cushion block 12 supported by the top surface of the lifting end of the jack. The jack protection cushion block 12 includes a support cushion layer supported by the top surface of the lifting end of the jack and a limiting limb 124 for limiting the lifting end of the jack. The use of the jack protection cushion block 12 can increase the force application area of the lifting end of the jack, disperse the load transmitted by the steel box girder 001, and improve the safety of the jacking construction of the steel box girder 001;

[0045] The support cushion layer is located between the top surface of the lifting end of the jack and the bottom surface of the jacking cushion beam 5. The limiting limb 124 is connected to the bottom surface of the support cushion layer. The limiting limb 124 is several pieces evenly distributed circumferentially around the lifting end of the jack. The arrangement of the limiting limb 124 further improves the support effectiveness and reliability of the jack 6 for the steel box girder 001, and at the same time can prevent the displacement of the jack protection cushion block 12, improving the construction safety.

[0046] In this embodiment, the support cushion layer includes an upper cushion plate 121, a lower cushion plate 122 and a connecting rib 123. The upper cushion plate 121 and the lower cushion plate 122 are parallel, and the connecting rib 123 is vertically connected to the upper cushion plate 121 and the lower cushion plate 122 to improve the structural reliability; the structures of the upper cushion plate 121 and the lower cushion plate 122 are the same, and in the vertical projection, the overlapping parts of the upper cushion plate 121 and the lower cushion plate 122 are connected by the connecting rib 123; the connecting rib 123 is several pieces, and the several pieces of the connecting rib 123 are connected between the upper cushion plate 121 and the lower cushion plate 122 in a mutually perpendicular manner; improving the reliability and uniform force transmission of the structure;

[0047] More specifically, the upper cushion plate 121 and the lower cushion plate 122 are rectangular plates with the same structure. A plurality of connecting ribs 123 perpendicular to each other divide the area between the upper cushion plate 121 and the lower cushion plate 122 into several force - transmitting cavities with approximately equal sizes, further enhancing the structural reliability and force - transmitting stability of the jack protection cushion block 12 to meet the stable and reliable support requirements for the jacking cushion beam 5.

[0048] Among them, the thickness of the connecting rib 123 parallel to the length direction of the lower cushion plate 122 is 1.8 to 2.2 times the thickness of the connecting rib 123 perpendicular to the length direction of the lower cushion plate 122. In this solution, the thickness of the connecting rib 123 parallel to the length direction of the lower cushion plate 122 is 2 times the thickness of the connecting rib 123 perpendicular to the length direction of the lower cushion plate 122, making the sizes of the force - transmitting cavity chambers approximately equal, with only small size differences. When the jack protection cushion block 12 is in use, the thicker connecting rib 123 is arranged parallel to the transverse direction. The thicker connecting rib 123 can provide stronger rigid support for the jacking cushion beam 5, ensuring the reliability and effectiveness of the use of the jack protection cushion block 12. The jack 6 can provide more reliable force - applying conditions for the jacking cushion beam 5 through the jack protection cushion block 12.

[0049] In this embodiment, the support cushion layer further includes a reinforcing rib 125 arranged near the center of the horizontal plane of the lower cushion plate 122. The reinforcing rib 125 is perpendicular to the length direction of the lower cushion plate 122, and the top and bottom ends of the reinforcing rib 125 along the width direction of the lower cushion plate 122 are respectively connected to the adjacent connecting ribs 123. The reinforcing rib 125 is composed of several pieces, and several pieces of the reinforcing rib 125 are arranged at intervals along the length direction of the lower cushion plate 122. The projections of several pieces of the reinforcing rib 125 on the length direction of the lower cushion plate 122 coincide. The use of the reinforcing rib 125 in the jack protection cushion block 12 can further enhance the protection of the lifting end of the jack, ensuring the reliability and effectiveness of the use of the jack protection cushion block 12. At the same time, since the structure at this place is a strongly stressed node, it is more necessary to make reliable structural strengthening to improve the structural strength, meet the construction requirements, and enhance the construction safety.

[0050] More specifically, in this solution, there are two connecting ribs 123 parallel to the length direction of the lower cushion plate 122, which are symmetrically distributed above and below the horizontal center of the lower cushion plate 122, and there are four connecting ribs 123 perpendicular to the length direction of the lower cushion plate 122, which are symmetrically distributed on the left and right sides of the horizontal center of the lower cushion plate 122. The reinforcing rib 125 is composed of three pieces that are correspondingly connected in the force - transmitting cavities distributed near the horizontal center of the lower cushion plate 122, and the three pieces of the reinforcing rib 125 are sequentially distributed and connected in the middle of the corresponding force - transmitting cavities.

[0051] In this embodiment, the bottom surface of the lower cushion plate 122 is parallel to the horizontal plane. The top surface of the lower cushion plate 122 is supported by the top surface of the lifting end of the jack 6. The top surface of the upper cushion plate 121 supports the bottom surface of the pushing cushion beam 5. The center of the horizontal plane of the supporting cushion layer coincides vertically with the lifting center of the lifting end of the jack 6, which improves the safety of the lifting and pushing construction process. At the same time, the force applied by the jack 6 can be completely converted into an effective jacking force, improving the construction quality.

[0052] In this embodiment, the limiting limbs 124 are vertically connected to the bottom surface of the lower cushion plate 122. The dimension of the inner edge of the limiting limbs 124 along the clockwise connection is the same as the radial dimension of the jacking end of the jack 6, which improves the reliability of the use of the jack 6 and the stability of the applied force, and prevents construction safety problems caused by the change of the jacking position of the jack 6. The width direction of the lower cushion plate 122 is slightly larger than the radial dimension of the jacking end of the jack 6. The limiting limbs 124 are four pieces corresponding to the four corners of the lower cushion plate 122. The respective extension lines of the four limiting limbs 124 pass through the horizontal center of the lower cushion plate 122, further improving the reliability of the use of the jack 6 and the stability of the applied force.

[0053] In this embodiment, the upper support assembly further includes a plurality of cushion beam pads 10. The height of the cushion layer is adjusted by increasing or decreasing the number of the cushion beam pads 10 in the height direction.

[0054] The thickness of one cushion beam pad 10 is not greater than the height of one flange column 9. In this solution, the superposed height of a preset number of cushion beam pads 10 is approximately the same as the height of one flange column 9. The meaning of "approximately the same" is that dimensional changes caused by wear or manufacturing precision can be allowed on the basis of being the same, which will not be elaborated here. It improves the reliability of subsequent high-position beam dropping and the construction quality.

[0055] The increase or decrease of the cushion beam pads 10 on the same axis forms a set of cushion beam pad groups. The set of cushion beam pad groups is used to support the bottom surface of the steel box girder 001 by the corresponding pushing cushion beam 5, front support cushion beam 7 and rear support cushion beam 8. That is, during the pushing construction, the height between the bottom surface of the steel box girder 001 and the top surfaces of the pushing cushion beam 5, front support cushion beam 7 and rear support cushion beam 8 is variable, and the height difference does not exceed the height of one flange column 9 with the gradual rise range of each push of the steel box girder 001. The use of the cushion beam pads 10 can make up for the lifting height of the steel box girder 001 from the cushion beam after a preset number of pushes of the steel box girder 001. The cushion beam pads 10 are flexible to use and convenient to arrange, greatly improving the pushing construction progress and quality of the steel box girder 001, meeting the effective support of the cushion beam for the steel box girder 001, improving the construction safety, and at the same time overcoming the problems of a large amount of steel plate consumption, cumbersome stacking or unloading, and effectively controlling the construction cost.

[0056] In this embodiment, the cushion beam cushion block 10 includes a top plate 101 and a plurality of support ribs 102 vertically connected to the bottom surface of the top plate 101. On the one hand, it increases the use height of the cushion beam cushion block 10, thereby replacing the stacking of steel plates with the same height. On the other hand, this vertical method can ensure that the structural strength of the cushion beam cushion block 10 meets the construction requirements, is convenient for stacking and unloading. At the same height, only one cushion beam cushion block 10 is needed to replace the stacking of multiple steel plates. It is lighter in weight, has higher construction efficiency, and the construction cost can be controlled within a lower range;

[0057] The plurality of support ribs 102 divide the bottom surface of the top plate 101 into several force distribution areas, and the several force distribution areas converge towards the center of the horizontal plane of the top plate 101, improving the support reliability. The horizontal plane is perpendicular to the vertical direction. And in this solution, the top plate 101 is a rectangular plate, and the plurality of support ribs 102 are connected to the bottom surface of the top plate 101 in a mutually perpendicular manner, that is, the mutually perpendicular support ribs 102 form a "well" - shaped structure, and the mutually perpendicular support ribs 102 are also perpendicular to the edges of the corresponding side rectangular plates; combined with the technical feature that the top plate 101 is perpendicular to the support ribs 102, each force distribution area is a rectangular cavity, further improving the structural reliability and force transmission stability of the cushion beam cushion block 10, and meeting the support requirements for the steel box girder 001.

[0058] In this embodiment, the upper support assembly further includes an upper plug cushion block 11 for supporting the bottom surface of the steel box girder 001. The upper plug cushion block 11 includes a base with the same structure as the cushion beam cushion block 10 and a functional cushion layer 111 provided on the upper surface of the base. The functional cushion layer 111 is located between the base and the bottom surface of the steel box girder 001. The stiffness of the functional cushion layer 111 is lower than that of the base, and the friction coefficient of the functional cushion layer 111 is lower than that of the base; the purpose of using the upper plug cushion block 11 is to reduce the hard direct contact between the bottom of the steel box girder 001 and the jacking mechanism and the support structure, reduce the friction coefficient, protect the integrity of the paint surface of the steel box girder 001 during the jacking construction process, reduce the risk of paint deformation and peeling at the bottom of the steel box girder 001, improve the construction quality, and eliminate the step of post - painting construction, shortening the construction period.

[0059] In this embodiment, the functional cushion layer 111 is a polytetrafluoroethylene plate fixed on the top surface of the top plate 101, or other low - stiffness plates with a polytetrafluoroethylene coating, such as polyethylene plates or polyvinyl chloride plates, which will not be elaborated here; in this solution, the functional cushion layer 111 is a polytetrafluoroethylene plate fixed on the top surface of the top plate 101, which has the advantages of low cost and controllable cost; more specifically, the ratio of the thickness of the functional cushion layer 111 to the thickness of the top plate 101 is between 0.55 and 0.65, and in this solution, it is 0.6, avoiding the poor stability of the steel box girder 001 caused by a large ratio and the insufficient paint surface protection caused by a small ratio. On the one hand, it meets the support strength, and on the other hand, it meets the jacking requirements, improving the construction quality.

[0060] In this embodiment, the upper plug cushion block 11 includes an upper plug cushion block I disposed at the top directly above the jacking cushion beam 5 for supporting the bottom surface of the steel box girder 001, an upper plug cushion block II disposed at the top directly above the front support cushion beam 7 for supporting the bottom surface of the steel box girder 001, and an upper plug cushion block III disposed at the top directly above the rear support cushion beam 8 for supporting the bottom surface of the steel box girder 001;

[0061] The upper plug cushion block I, the upper plug cushion block II, and / or the upper plug cushion block III respectively form the support for the steel box girder 001 through their respective corresponding cushion beam cushion block groups;

[0062] More specifically, the upper plug cushion block I forms the support for the steel box girder 001 through the cushion beam cushion block group I disposed on the top of the jacking cushion beam 5, the upper plug cushion block II forms the support for the steel box girder 001 through the cushion beam cushion block group II disposed on the top of the front support cushion beam 7, and the upper plug cushion block III forms the support for the steel box girder 001 through the cushion beam cushion block group III disposed on the top of the front support cushion beam 7.

[0063] In this embodiment, the flange column 9, the cushion beam cushion block 10, and the jack protection cushion block 12 are all steel structural members. While improving the support reliability, they have better rigidity and higher service life, are convenient for turnover use, and reduce the construction cost.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A jack support structure for steel box girder jacking construction, characterized in that: It comprises an upper support assembly; the upper support assembly comprises a jack protection pad supported by the top surface of the jack lifting end, the jack protection pad comprises a support cushion layer supported by the top surface of the jack lifting end and a limiting limb used to limit the jack lifting end, the support cushion layer is located between the top surface of the jack lifting end and the bottom surface of the top push cushion beam, the limiting limb is connected to the bottom surface of the support cushion layer, and the limiting limb is a plurality of pieces uniformly distributed in the circumferential direction of the jack lifting end; The upper support assembly further includes a top push pad beam and a pad beam pad block, wherein the top push pad beam is supported by a jack protection pad block, and the pad beam pad block is arranged on the top of the top push pad beam; the pad beam pad block is composed of a plurality of pad beam pad blocks, and the pad layer height is adjusted by increasing or decreasing the pad beam pad blocks in the height direction; The upper support assembly also includes an upper pad for supporting the bottom surface of the steel box beam, wherein the upper pad forms support for the steel box beam through a pad group of pads arranged on the top of the jacking pad; The upper plugging pad includes a base having the same structure as the pad of the pad beam and a functional pad layer arranged on the upper surface of the base, wherein the functional pad layer is located between the base and the bottom surface of the steel box beam.

2. The jack support structure for steel box girder jacking construction according to claim 1 is characterized in that: It also includes a lower support assembly; the lower support assembly includes a flange column supported at a preset position, the jack is supported by the flange column, the flange column is divided into several sections, and the several sections of the flange column adjust the support height of the jack by increasing or decreasing in the height direction.

3. The jack support structure for steel box girder jacking construction according to claim 2 is characterized in that: The lower support assembly also includes a temporary pier fixed at a preset position, a transverse distribution beam supported by the temporary pier and a longitudinal distribution beam supported by the transverse distribution beam, and the flange column group supported by the jack is supported by the longitudinal distribution beam.

4. The jack support structure for steel box girder jacking construction according to claim 3 is characterized in that: The jack supported by the flange column group is located in the longitudinal middle of the longitudinal distribution beam.

5. The jack support structure for steel box girder jacking construction according to claim 1 is characterized in that: The cushion beam pad includes a top plate and a plurality of supporting ribs vertically connected to the bottom surface of the top plate; the plurality of supporting ribs divide the bottom of the top plate into a plurality of force distribution areas, and the plurality of force distribution areas converge toward the center of the horizontal plane of the top plate.

6. The jack support structure for steel box girder jacking construction according to claim 5, characterized in that: The functional cushion layer is a polytetrafluoroethylene plate fixed on the top surface of the top plate; the ratio of the thickness of the functional cushion layer to the thickness of the top plate is between 0.55 and 0.

65.

7. The jack support structure for steel box girder jacking construction according to claim 1 is characterized in that: The support pad layer comprises an upper pad, a lower pad and connecting ribs, the upper pad is parallel to the lower pad, the connecting ribs are a plurality of pieces, and the plurality of connecting ribs are connected between the upper pad and the lower pad in a mutually perpendicular manner; The bottom surface of the lower pad is parallel to the horizontal plane, the top surface of the lower pad is supported by the top surface of the lifting end of the jack, and the limiting limb is vertically connected to the bottom surface of the lower pad.

8. The jack support structure for steel box girder jacking construction according to claim 7, characterized in that: The plurality of mutually perpendicular connecting ribs divide the area between the upper pad and the lower pad into a plurality of force transmission cavities of approximately equal size.

9. The jack support structure for steel box girder jacking construction according to claim 8, characterized in that: The center of the horizontal plane of the supporting cushion layer coincides with the lifting center of the lifting end of the jack in the vertical direction; the upper pad and the lower pad have the same structure, and in the vertical projection, the upper pad and the lower pad overlap and are connected by connecting ribs.

10. The jack support structure for steel box girder jacking construction according to claim 9, characterized in that: The upper pad and the lower pad are rectangular plates with the same structure, and the support pad also includes a reinforcing rib arranged near the center of the horizontal plane of the lower pad; the reinforcing rib is perpendicular to the length direction of the lower pad, and the top and bottom ends of the reinforcing rib along the width direction of the lower pad are respectively connected to the connecting ribs close thereto; The reinforcing ribs are composed of a plurality of pieces, and the plurality of pieces of the reinforcing ribs are arranged at intervals along the length direction of the lower pad, and the projections of the plurality of pieces of the reinforcing ribs in the length direction of the lower pad overlap.

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