Cantilever supporting structure for steel box girder incremental launching construction

Abstract

The utility model relates to the technical field of cantilever supporting structures, and discloses a cantilever supporting structure for pushing construction of a steel box girder, which comprises a distribution girder component, temporary buttresses are welded on two sides of the bottom end of the distribution girder component, a steel cushion rail is mounted at the top end of the distribution girder component, and a cushion block is mounted in the steel cushion rail in a sliding manner. The cushion block serves as a transmission part between the steel cushion rail and the steel box girder, the left-right mobility of the cushion block is utilized, and the friction resistance between the cushion block and the steel cushion rail is smaller, so that the pushing starting resistance is reduced when the steel box girder performs pushing movement in the whole cantilever supporting structure, the smoothness of the pushing starting of the steel box girder is improved, and the service life of the steel box girder is prolonged. The jacking inclination of the steel box girder can be reduced, the moving stability of the steel box girder is guaranteed, and meanwhile the movable range of the cushion block can be conveniently limited under the cooperation of the limiting block and the buffer block, so that the guiding effect of the cushion block on the steel box girder is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cantilever support structures, in particular to a cantilever support structure for top-pushing construction of steel box beams. Background Art

[0002] There are three existing methods for installing steel box girders: bracket installation, cantilever assembly and top-pushing installation. The top-pushing method for steel box girders refers to a construction method in which the beam body is assembled section by section at the bridge head and pushed longitudinally with a jack so that the beam body passes through the temporary sliding bearing surface of each pier top or local bracket to be in place. This method is suitable for continuous bridges with larger spans and equal cross-sections, especially valleys with complex environments under the bridge and projects with cross-line traffic requirements.

[0003] China Patent Authorization Announcement No. CN210262748U discloses a cantilever support structure for steel box girder top-pushing construction. Through the effective support of the structure, the overall stability of the steel box girder top-pushing construction is greatly improved. The utility model is a cantilever support structure for steel box girder top-pushing construction, including two sliders, two lifting units, two cushion beams, a fixed frame and a distribution beam. The cushion beam is arranged on a temporary pile, one end of the lifting unit is arranged on the cushion beam, and the other end is connected to the bottom of the distribution beam, one end of the fixed frame is connected to the distribution beam, and the other end is connected to the pier top cushion stone support; the slider is located above the distribution beam and can be connected to the bottom of the steel box girder cantilever. The above-mentioned prior art solution has the following shortcomings: the structure mainly welds the slider and the top of the distribution beam, and the top of the slider slides relative to the steel box girder. Since the weight of the steel box girder is large, the front end of the steel box girder generates hysteresis during the top-pushing process, especially during the starting process, due to the sliding resistance of the slider, thereby affecting the top-pushing smoothness of the steel box girder, so there is a certain room for improvement. Utility Model Content

[0004] The utility model aims to provide a cantilever support structure for jacking construction of steel box girders, so as to solve the problem of sudden friction between the existing steel box girders and the cantilever support structure when jacking is started, thereby reducing the flow of movement of the steel box girders.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cantilever supporting structure for steel box girder jacking construction, comprising a distribution beam assembly, temporary piers are welded on both sides of the bottom end of the distribution beam assembly, a steel pad rail is installed on the top end of the distribution beam assembly, and a pad block is slidably installed inside the steel pad rail, a groove is opened at the bottom end of the pad block, balls are evenly embedded at the bottom end of the steel pad rail, and the top ends of the balls extend to the inside of the groove, and at the same time, the top ends of the balls abut against the inner walls of the groove, limit blocks are installed on both sides of the bottom end of the pad block, and buffer blocks are installed at both ends of the limit block close to the distribution beam assembly, an adjustment mechanism is arranged inside the distribution beam assembly, and side plates are installed on both sides of the adjustment mechanism, and side guide blocks are installed on the top ends of the side plates.

[0006] Preferably, the distribution beam assembly includes a base plate, and the bottom end of the base plate is welded to the top of the temporary pier, the top of the base plate is evenly installed with pressure dividing plates, and the pressure dividing plates are evenly distributed, the top ends of multiple pressure dividing plates are connected to a top plate, and the top plate, the pressure dividing plates and the base plate are an integrated structure.

[0007] Preferably, the cushion block and the steel cushion rail form a left-right sliding structure, and the length of the cushion block is greater than the length of the steel cushion rail.

[0008] Preferably, both left and right sides of the cushion block are set to be rounded, and the top end of the cushion block abuts against the bottom end of the steel box girder.

[0009] Preferably, a fixing block passes through the gap between the pressure-dividing plates, and screws are installed on both sides of the fixing blocks. A plurality of positioning holes are correspondingly opened inside the side plates, one end of the screw passes through the positioning holes, and a locking nut is threadedly sleeved on the outside of the screw, and the locking nut is located on the outside of the positioning hole.

[0010] Preferably, the size of the fixing block is adapted to the size of the gap between adjacent pressure dividing plates, and both ends of the fixing block are welded to the inner wall of the distribution beam assembly.

[0011] Preferably, the cross-section of the side guide block is a right-angled trapezoid, the inclined surface of the side guide block faces the cushion block, and the two side guide blocks are symmetrically distributed about the central axis of the distribution beam assembly.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) By using the pad as a transmission part between the steel rail and the steel box girder, the pad's left and right mobility is utilized, and the friction resistance between the pad and the steel rail is smaller, so that when the steel box girder is pushed and moved in the entire cantilever support structure, the resistance during the push start is reduced, thereby improving the smoothness of the steel box girder during the push start, which is beneficial to reducing the push tilt of the steel box girder and ensuring its movement stability. At the same time, with the cooperation of the limit block and the buffer block, the movable range of the pad is limited to ensure the guiding effect of the pad on the steel box girder;

[0014] (2) The left and right side guide blocks are used to further limit and guide the two sides of the steel box girder in the horizontal direction, so as to further prevent the steel box girder from tilting during the jacking process. The adjustment mechanism is used to adjust the distance between the two side guide blocks in cooperation with the locking nut, screw, etc., so as to improve the limit and guide effect of the cantilever support structure for steel box girders of different widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the distribution beam assembly of the utility model;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the cushion block of the utility model;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the adjustment mechanism of the utility model.

[0020] Explanation of the reference numerals in the figure: 1. Distribution beam assembly; 101. Top plate; 102. Pressure dividing plate; 103. Bottom plate; 2. Temporary pier; 3. Steel rail; 4. Pad; 5. Limit block; 6. Buffer block; 7. Ball; 8. Groove; 9. Adjustment mechanism; 901. Fixing block; 902. Screw; 903. Positioning hole; 904. Locking nut; 10. Side guide block; 11. Side plate. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-Figure 4 , the utility model provides an embodiment: a cantilever support structure for steel box girder jacking construction, comprising a distribution beam assembly 1;

[0023] The distribution beam assembly 1 includes a bottom plate 103, and the bottom end of the bottom plate 103 is welded to the top end of the temporary pier 2, and the top end of the bottom plate 103 is evenly installed with pressure dividing plates 102, and the pressure dividing plates 102 are evenly distributed, and the top ends of the plurality of pressure dividing plates 102 are connected to the top plate 101, and the top plate 101, the pressure dividing plates 102 and the bottom plate 103 are an integrated structure;

[0024] Specifically, Figure 1 , Figure 2 As shown, when in use, the pressure dividing plate 102 is used to divide the pressure on the top plate 101;

[0025] The gaps between the pressure dividing plates 102 are penetrated by fixing blocks 901, and screws 902 are installed on both sides of the fixing blocks 901. A plurality of positioning holes 903 are correspondingly opened inside the side plates 11, and one end of the screws 902 penetrates the positioning holes 903. The outer parts of the screws 902 are threadedly sleeved with locking nuts 904, and the locking nuts 904 are located outside the positioning holes 903.

[0026] The size of the fixed block 901 is adapted to the size of the gap between the adjacent pressure dividing plates 102, and both ends of the fixed block 901 are welded to the inner wall of the distribution beam assembly 1;

[0027] Specifically, Figure 1 , Figure 4 As shown, when in use, the locking nut 904 is screwed on the screw rod 902 to different depths to adjust the position of the side plate 11, thereby adjusting the distance between the two side guide blocks 10, so as to adapt to the guiding effect of steel box girders of different widths;

[0028] Temporary piers 2 are welded on both sides of the bottom of the distribution beam assembly 1, a steel pad rail 3 is installed on the top of the distribution beam assembly 1, and a pad block 4 is slidably installed inside the steel pad rail 3;

[0029] The pad block 4 and the steel pad rail 3 form a left-right sliding structure, and the length of the pad block 4 is greater than the length of the steel pad rail 3;

[0030] The left and right sides of the cushion block 4 are both set to be rounded, and the top end of the cushion block 4 abuts against the bottom end of the steel box beam;

[0031] Specifically, Figure 1 , Figure 3 As shown, the pad 4 is used to reduce the friction resistance of the steel box girder during the jacking start, so that the resistance of the steel box girder during the starting process is gradually increased and maintained, so as to avoid the steel box girder from being suddenly moved by force and causing the front side to tilt, thereby ensuring the jacking movement stability of the steel box girder;

[0032] A groove 8 is provided at the bottom end of the cushion block 4, and balls 7 are evenly embedded at the bottom end of the steel cushion rail 3, and the top ends of the balls 7 extend to the inside of the groove 8, and the top ends of the balls 7 abut against the inner wall of the groove 8. Limiting blocks 5 are installed on both sides of the bottom end of the cushion block 4, and buffer blocks 6 are installed at both ends of the limiting blocks 5 close to the distribution beam assembly 1. An adjustment mechanism 9 is provided inside the distribution beam assembly 1, and side plates 11 are installed on both sides of the adjustment mechanism 9, and side guide blocks 10 are installed on the top ends of the side plates 11.

[0033] The cross section of the side guide block 10 is a right-angle trapezoid, the inclined surface of the side guide block 10 faces the cushion block 4, and the two side guide blocks 10 are symmetrically distributed about the central axis of the distribution beam assembly 1;

[0034] Specifically, Figure 1 , Figure 4 As shown, when in use, the side guide blocks 10 are utilized to facilitate the lateral positioning and guiding of the steel box girder, so as to further improve the accuracy of subsequent installation of the steel box girder.

[0035] Working principle: When the utility model is used, the distribution beam assembly 1 is first welded to the top of the temporary pier 2, and the fixing block 901 is welded to the gap between the screw rods 902. By screwing the locking nut 904, the side plate 11 is moved left and right along the outside of the screw rod 902. The screwing depth of the locking nut 904 is adjusted to adjust the distance between the two side guide blocks 10 to adapt to the width of the actual construction steel box beam. The inclined surface structure of the side guide block 10 is used to limit and guide the two sides of the bottom end of the steel box beam.

[0036] Secondly, the steel box girder is pushed along the length direction of the cushion block 4, so that one end of the steel box girder contacts one side of the cushion block 4 successively, and the cushion block 4 is driven to slide along the steel cushion rail 3 through the static friction between the cushion block 4, so that the cushion block 4 drives the limit block 5 to move synchronously, and the rolling friction between the ball 7 and the groove 8 reduces the moving friction of the cushion block 4 along the steel cushion rail 3, so that the top push start of the steel box girder is smoother;

[0037] Finally, as the steel box girder is continuously pushed, the limit block 5 on one side abuts against one side of the distribution beam assembly 1, thereby converting the static friction between the steel box girder and the cushion block 4 into sliding friction, causing the steel box girder to continue to move along the top of the cushion block 4 and the inclined surface of the side guide block 10, so as to realize the pushing installation of the steel box girder.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A cantilever support structure for steel box girder jacking construction, comprising a distribution beam assembly (1), characterized in that: Temporary piers (2) are welded on both sides of the bottom end of the distribution beam assembly (1); a steel pad rail (3) is installed on the top end of the distribution beam assembly (1); a pad block (4) is slidably installed inside the steel pad rail (3); a groove (8) is opened at the bottom end of the pad block (4); balls (7) are evenly embedded at the bottom end of the steel pad rail (3); the top ends of the balls (7) extend into the inside of the groove (8); and the top ends of the balls (7) abut against the inner wall of the groove (8); limit blocks (5) are installed on both sides of the bottom end of the pad block (4); and buffer blocks (6) are installed at both ends of the limit blocks (5) close to the distribution beam assembly (1); an adjustment mechanism (9) is arranged inside the distribution beam assembly (1); side plates (11) are installed on both sides of the adjustment mechanism (9); and side guide blocks (10) are installed at the top ends of the side plates (11).

2. A cantilever support structure for top-pushing construction of a steel box girder according to claim 1, characterized in that: The distribution beam assembly (1) comprises a bottom plate (103), wherein the bottom end of the bottom plate (103) is welded to the top end of the temporary pier (2), pressure dividing plates (102) are evenly installed on the top end of the bottom plate (103), and the pressure dividing plates (102) are evenly spaced, and the top ends of a plurality of the pressure dividing plates (102) are connected to a top plate (101), and the top plate (101), the pressure dividing plates (102) and the bottom plate (103) are an integrated structure.

3. The cantilever support structure for top-pushing construction of a steel box girder according to claim 1, characterized in that: The cushion block (4) and the steel cushion rail (3) form a left-right sliding structure, and the length of the cushion block (4) is greater than the length of the steel cushion rail (3).

4. The cantilever support structure for top-pushing construction of a steel box girder according to claim 1, characterized in that: The left and right sides of the cushion block (4) are both arranged with rounded corners, and the top end of the cushion block (4) abuts against the bottom end of the steel box beam.

5. The cantilever support structure for top-pushing construction of a steel box girder according to claim 2, characterized in that: A fixing block (901) passes through the gaps between the pressure dividing plates (102), and screw rods (902) are installed on both sides of the fixing blocks (901). A plurality of positioning holes (903) are correspondingly opened inside the side plates (11), one end of the screw rods (902) passes through the positioning holes (903), and a locking nut (904) is threadedly sleeved on the outside of the screw rods (902), and the locking nut (904) is located outside the positioning hole (903).

6. A cantilever support structure for top-pushing construction of a steel box girder according to claim 5, characterized in that: The size of the fixing block (901) is adapted to the size of the gap between adjacent pressure dividing plates (102), and both ends of the fixing block (901) are welded to the inner wall of the distribution beam assembly (1).

7. The cantilever support structure for top-pushing construction of a steel box girder according to claim 1, characterized in that: The cross section of the side guide block (10) is a right-angled trapezoid, the inclined surface of the side guide block (10) faces the cushion block (4), and the two side guide blocks (10) are symmetrically distributed about the central axis of the distribution beam assembly (1).

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