Support device for middle connection point of long-span box beam and construction method

Abstract

The present invention relates to a supporter and a construction method for the middle connection point of a large-span box beam. The supporter comprises a connecting structure, both ends of which are fixedly connected with hinge ear plates and connected with the beam ends of two box beams through a rotating shaft; an adjusting member is also provided, which is located at the outer end of the bottom beam end of the box beam and is used to support the outer end of the beam end upward; the construction method comprises the following steps: firstly hanging the supporter on the end of one of the box beams, and then hoisting the two beams into place; rotating the supporter and connecting it with the rotating shaft of the other box beam through the rotating shaft; adjusting the elevation of the beam end by a lifting crane, supporting and fixing the beam end by using the adjusting member, and then unhooking the hook so that the beam ends of the two box beams are completely unloaded onto the supporter; when the lifting crane adjusts the elevation of the beam end, a settlement error is reserved to ensure that the first box beam and the second box beam are horizontal and in the same line after the hook is unhooked. The present scheme replaces the traditional ground scaffolding support, makes on-site construction more convenient and quick, reduces installation costs, and improves work efficiency.

Description

Technical Field

[0001] The invention belongs to the field of construction engineering support, and in particular relates to a support device for an intermediate connection point of a large-span box beam and a construction method. Background Art

[0002] Due to transportation and lifting reasons, existing large-span beams need to be installed in sections. Two or more sections of steel beams need to be connected in mid-air during construction. The work of connecting the cantilevered ends of steel beams in mid-air requires stabilizing the steel beam structure on the one hand, and accurately docking the two cantilevered ends on the other hand, so as to facilitate welding of the welds. The traditional installation method is to set up an installation scaffolding rooted from the ground under the box beam, and then remove the scaffolding after the box beam is installed; however, the installation of scaffolding is poor in both economy and construction convenience.

[0003] In order to solve the problem of large investment in manpower and material resources for ground scaffolding, my country's patent number is CN201921803158.7, the application date is October 25, 2019, and the publication number is CN211524134U. It discloses a structure that can temporarily support cantilevered steel beams. It is to fix a pull rod on the top of the steel column, and the installation and fixing structure of the pull rod plus the traction rope supports the steel beam to prevent the cantilevered end of the steel beam from sinking. This scheme uses the fixed structure at the top of the column to support the beam body obliquely, and does not require the use of scaffolding to support the cantilevered end of the beam body. However, this temporary support structure effectively restricts the sinking problem of the cantilevered end of the steel beam, but cannot control the lateral displacement of the cantilevered end, so it is not effective in the construction of steel beam docking. Summary of the invention

[0004] The present invention aims to solve the problems in the prior art and provides a solution with short crane input time and high steel beam butt joint accuracy.

[0005] The present invention solves the above-mentioned problem by adopting the following technical solution:

[0006] A support for the middle connection point of a long-span box beam, wherein the beam roots of the first box beam and the second box beam are respectively connected to a fixed structure, and the beam ends are connected through the support, and the support comprises: a connecting member, which extends from the beam end of the first box beam to the beam end of the second box beam; a hinge ear plate, which is respectively fixed to the two ends of the connecting member, and an axial hole is arranged on the plate surface, and is rotatably connected to the beam end through a rotating shaft; an adjusting member, which is installed on the connecting member, is located at the bottom of the box beam and is arranged at the outer end of the corresponding box beam end, and the adjusting member supports the outer end of the beam end upward to adjust the horizontality of the box beam.

[0007] Compared with the prior art, the present invention adopting the above structure has the following beneficial effects:

[0008] 1) The support provided by the present invention can connect and support the ends of the box beam. The support is a suspended support structure, which solves the problems of high cost and troublesome construction of ground scaffolding; 2) The support of the present invention can adjust the beam ends to ensure that the beam body is horizontal and the butt weld meets the welding design; 3) After the support of the present invention is installed, it replaces the lifting crane to maintain the stability of the beam end, saving the cost of using the lifting crane during the welding construction stage.

[0009] As a preferred embodiment, a further technical solution of the above structure is:

[0010] The connecting member is composed of a first support arm and a second support arm, the lower ends of which are welded together to form a V shape, and the upper ends of which are fixedly connected to the hinge ear plate; a reinforcing rod is also fixedly connected between the first support arm and the second support arm. This embodiment is easy to manufacture, and the strength can meet the requirements for the tie-in of the beam end.

[0011] The connecting member is an arc rod, and the two ends of the arc rod are welded with the hinge ear plates. The arc rod of this structure can withstand a large force from the box beam acting on the two ends and is not easy to be damaged.

[0012] The connecting member is a straight flat steel plate, holes are made at both ends of the straight flat steel plate to form the hinge ear plate, and two straight flat steel plates are respectively arranged on both sides of the butt joint position of the two box beams. This implementation has good stability and high strength.

[0013] A U-shaped vertical frame is also fixed under the flat steel plate, the tops of the vertical beams on both sides of the U-shaped vertical frame are fixed to the ends of the flat steel plate, and the horizontal beams of the U-shaped vertical frame are located under the ends of the beams. In this embodiment, the U-shaped vertical frame provides a position for setting an adjustment component under the box beam.

[0014] The adjusting member is composed of a vertically arranged support and a wedge iron, the lower end of the support is welded and fixed to the connecting member, and the upper end is movably provided with the wedge iron, and the top of the wedge iron abuts against the bottom surface of the beam end. This embodiment has low cost and is easy to install.

[0015] The adjusting member is a jack. This embodiment realizes repeated adjustment of the fulcrum of the box beam after the hook is removed.

[0016] The adjusting member is a steel wire rope, one end of which is connected to a straight-line flat steel plate on one side through a fixing buckle, and the other end is connected to a straight-line flat steel plate on the other side through an adjusting buckle. The fixing buckle and the adjusting buckle are respectively arranged on both sides of the beam end. The length of the steel wire rope is adjusted through the adjusting buckle to adjust the height of the outer end of the beam end. This embodiment has low cost, can adjust the fulcrum up and down, and is easy to operate.

[0017] In order to solve the problems of the prior art, the present invention also provides a construction method for the middle connection point of a large-span box beam, using the support device for the middle connection point of the large-span box beam, and the specific construction process is as follows:

[0018] The first step is to weld the positioning assembly at the top of the steel column according to the design elevation of the box beam; and respectively weld the hinge seats at the lower sides of the beam ends of the first box beam and the second box beam;

[0019] The second step is to connect a hinge ear plate of the supporter to the hinge seat of the first box beam through a rotating shaft;

[0020] The third step is to use a lifting crane to move the first box beam and the second box beam between the two steel columns, place the beam base on the positioning assembly and connect them, and close the beam ends;

[0021] The fourth step is to rotate the supporter under the first box beam, and connect another hinge ear plate of the supporter to the hinge seat of the second box beam through another rotating shaft;

[0022] The fifth step is to adjust the elevation of the beam ends by using a lifting crane. After the adjustment is completed, use the adjusting component to support and fix the beam ends, and then remove the hook so that the weight of the beam ends of the first box beam and the second box beam are completely unloaded onto the support. When the lifting crane adjusts the elevation of the beam ends, a settlement error is reserved to meet the arching requirements and ensure that the first box beam and the second box beam are horizontal and collinear after the hook is removed.

[0023] Compared with the prior art, the present invention using the above method has the following beneficial effects:

[0024] The method provides a novel installation method for large-span segmented beams, replacing the traditional support method of rooting from the ground, making on-site construction more convenient and faster, reducing installation costs and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a first embodiment of a support device of the present invention;

[0026] Figure 2 It is a structural schematic diagram of a second embodiment of a support device of the present invention;

[0027] Figure 3 It is a reference diagram for hoisting two box beams of the present invention into position;

[0028] Figure 4 The present invention Figure 3 A magnified view of the positioning component structure at point A;

[0029] Figure 5 This is a diagram showing the initial connection state of the beam ends of the box beam of the present invention through the supports;

[0030] Figure 6 This is a state diagram of the beam end of the box beam of the present invention being supported by the adjusting member;

[0031] Figure 7It is a structural schematic diagram of a third embodiment of the support device of the present invention;

[0032] Figure 8 It is a side view of the third end of the support embodiment of the present invention (the beam end is in a sunken state);

[0033] Fig. 9 Schematic diagram of the state of the outer end of the steel wire rope adjusting beam end of the third embodiment of the support device of the present invention;

[0034] Fig.10 It is a deformation structure diagram of the third embodiment of the support device of the present invention.

[0035] In the figure: 1. first box beam; 2. second box beam; 3. connecting structure; 31. first support arm; 32. second support arm; 33. reinforcing rod; 34. arc rod; 35. I-shaped flat steel plate; 351. vertical frame; 4. hinge ear plate; 5. adjusting member; 51. pillar; 52. wedge; 53. jack; 54. adjusting buckle; 55. steel wire rope; 56. fixing buckle; 6. rotating shaft; 7. hinge seat; 8. steel column; 9. positioning assembly; 11. sleeve frame. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0037] The present invention is used for the butt joint construction of box beams of large-span flat-roof buildings, and provides a supporter for connecting and supporting the middle connection of two box beams. The roots of the first box beam 1 and the second box beam 2 are connected to a fixed structure, and the ends of the first box beam 1 and the second box beam 2 are connected through the supporter.

[0038] The support device comprises: a connecting member 3, a hinge ear plate 4 and an adjusting member 5.

[0039] A connecting member 3 extending from a beam end of the first box beam 1 to a beam end of the second box beam 2;

[0040] The ear plates 4 are fixed to the two ends of the connecting member 3, and the plate surface is provided with an axial hole, which is rotatably connected to the end of the beam through the rotating shaft 6;

[0041] The adjusting member 5 is installed on the connecting member 3, and is located at the bottom of the box beam and is arranged at the outer end of the corresponding box beam end; the adjusting member 5 supports the beam end upwards to adjust the horizontality of the box beam.

[0042] See also Figure 1 Embodiment shown:

[0043] The connecting member 3 is composed of a first supporting arm 31 and a second supporting arm 32, the lower ends of which are welded together to form a V shape, and the upper ends of which are fixedly connected to the hinge ear plate 4; a reinforcing rod 33 is also fixedly connected between the first supporting arm 31 and the second supporting arm 32; the adjusting member 5 is composed of a vertically arranged pillar 51 and a wedge 52, the lower ends of the pillars 51 are respectively welded and fixed to the middle inner walls of the first supporting arm 31 and the second supporting arm 32, and the upper ends are movably provided with the wedge 52, and the top of the wedge 52 abuts against the bottom surface of the beam end.

[0044] Since the straight line is the shortest between two points, the lengths of the first box beam 1 and the second box beam 2 are designed to match the required span, and a weld is reserved. The connecting member 3 of the present invention is a rigid structure, which is customized according to the horizontal spacing of the two hinge seats 7, but the ends of the two box beams are prone to sinking. In the sinking state, the spacing between the two hinge seats 7 will inevitably increase, and the axial holes of the hinge ear plates 4 at both ends of the connecting member 3 cannot be aligned with the axial holes on the hinge seat 7, so the installation of the rotating shaft 6 will be very difficult. In order to facilitate the installation of the support, the axial holes on the hinge ear plates 4 or the hinge seat 7 are designed to be holes with a slightly larger diameter or oblong holes.

[0045] After the two ends of the V-shaped connecting member 3 are connected to the box beam, the box beam has a large tensile force, and it is easy to tear. The reinforcing rod prevents the connecting member 3 from being directly torn under the force.

[0046] In the prior art, in order to solve the problem of the external overhang of a large-span steel beam sinking, a diagonal or hoisting device is usually set on the beam body to constrain the elevation of the external overhang. However, the adjustment is not precise, and the beam end is often not aligned accurately, and the reserved weld does not meet the standard, which will eventually affect the welding effect. Figure 5 , Figure 6 The first support arm 31 of the present invention is connected to the first box beam 1 through the rotating shaft 6, and the second support arm 32 is connected to the second box beam 2 through another rotating shaft 6, so that the beam ends of the first box beam 1 and the second box beam 2 are tied together. The two box beams interact with each other. Even after the sling is removed, the beam ends are still subject to certain constraints. The position of the rotating shaft 6 constitutes the first fulcrum of the beam end, which effectively controls the sinking amount of the beam end, so that it can replace the lifting crane to support the box beam; after the outer end of the beam end is supported by the adjusting member 5, the wedge 52 constitutes the second fulcrum of the beam end. After the wedge 52 is wedged, the position of the second fulcrum moves up. According to the principle of "two points determine a straight line", the first box beam 1 and the second box beam 2 are both horizontal. Because the support device is installed at the connecting end of the box beam, it is relatively easy to adjust and control whether the end flanges and webs of the two box beams have been aligned and whether the upper and lower widths of the welds have been consistent, so that the beam ends of the two box beams are adjusted to the design state (the beam body is horizontal and the ends are aligned).

[0047] As a variation of the above-mentioned support embodiment, see Figure 2 The connecting member 3 is an arc rod 34, and the two ends of the arc rod 34 are welded to the hinge ear plate 4. The arc rod 34 can convert the downward force of the box beam on one side into an upward force on the box beam on the other side. Compared with the V-shaped embodiment, the arc rod 34 can withstand a larger tensile force acting on both ends and is less prone to damage.

[0048] The hinge ear plates 4 of the connecting members 3 of the two schemes are arranged at the top, which are suitable for installation on the lower side of the box beam. Therefore, the lower side of the beam end is adapted to be fixed with an articulated seat 7 for installing the rotating shaft 6.

[0049] As another option of the adjusting member 5, the adjusting member 5 uses a jack 53. Although the structure of the support 51 and the wedge 52 is easy to manufacture and low in cost, the jack 53 can not only adjust the height of the second fulcrum, but also adjust it repeatedly, and can still adjust the fulcrum after the sling is removed.

[0050] The design idea of ​​the present invention is to use the connecting member 3 to tie the ends of the two box beams together so that the sinking of the two beams is mutually constrained, and then the sinking of the beam ends is adjusted by further supporting the outer ends of the beam ends. Based on this concept, the connecting member 3 should not be limited to being set on the lower side of the box beam, and a straight flat steel plate 35 can also be used. The two ends of the straight flat steel plate 35 are made of holes to form the hinge ear plate 4, see Figure 7 , Figure 8 and Fig. 9 , two straight flat steel plates 35 are respectively arranged on both sides of the butt joint of the two box beams; the adjusting member 5 uses a steel wire rope 55, one end of the steel wire rope 55 is connected to the straight flat steel plate 35 on one side through a fixing buckle 56, and the other end is connected to the straight flat steel plate 35 on the other side through an adjusting buckle 54, the fixing buckle 56 and the adjusting buckle 54 are respectively arranged on both sides of the beam end, and the length of the steel wire rope 55 is adjusted by the adjusting buckle 54 to adjust the height of the second fulcrum. The beam ends of the two box beams are tied together by the straight flat steel plates 35, and the outer ends of the beam ends are pulled upward by the steel wire rope 55, which has the same supporting and adjusting effect as the above embodiment, and this scheme can also facilitate further adjustment and callback.

[0051] In this embodiment, the rotating shaft 6 is arranged on the side of the beam end. In order to avoid damage to the box beam, a sleeve 11 can be installed at the beam end. The side wall of the sleeve 11 is provided with an axial hole for installing the rotating shaft 6.

[0052] The adjusting buckle can use an existing component that can lock the wire rope and can also release the wire rope.

[0053] See also Fig.10Based on the embodiment of the straight flat steel plate, if you want to use a pillar 51 or a jack 53 to support the outer end of the beam end, you can fix a U-shaped bracket 351 under the straight flat steel plate 35, the top of the vertical beams on both sides of the U-shaped bracket 351 are fixed to the ends of the flat steel plate, and the horizontal beam of the U-shaped bracket 351 is located at the lower side of the beam end. The U-shaped bracket 351 is used to fix the pillar 51 or the jack 53. The U-shaped brackets 351 on both sides also form a suspended platform, and a pad iron can be directly inserted into the horizontal beam to support the bottom wall of the beam end.

[0054] See also Figures 3 to 6 The construction method of the middle connection point of the long-span box beam provided by the present invention uses the support of the middle connection point of the long-span box beam, and the specific construction process is as follows:

[0055] The first step is to weld a positioning assembly 9 at the top of the steel column 8 according to the design elevation of the box beam; and weld hinge seats 7 at the lower sides of the beam ends of the first box beam 1 and the second box beam 2 respectively;

[0056] The second step is to connect a hinge ear plate 4 of the supporter to a hinge seat 7 of the first box beam 1 through a rotating shaft 6;

[0057] The third step is to use a lifting crane to move the first box beam 1 and the second box beam 2 between the two steel columns 8, place the beam base on the positioning assembly 9 and connect them, and close the beam ends;

[0058] The fourth step is to rotate the supporter under the first box beam 1, and connect another hinge ear plate of the supporter to the hinge seat of the second box beam 2 through another rotating shaft 6;

[0059] The fifth step is to adjust the elevation of the beam ends by means of a lifting crane, and after the adjustment is completed, support and fix the beam ends by means of the adjusting member 5; then remove the hook, so that the weight of the beam ends of the first box beam 1 and the second box beam 2 are completely unloaded onto the support; when adjusting the elevation of the beam ends by means of the lifting crane, a settlement error is reserved to meet the arching requirements, so as to ensure that the first box beam 1 and the second box beam 2 are both horizontal and collinear after the hook is removed.

[0060] 1) The support provided by the present invention can support the beam end of the box beam. The support is a suspended support structure, which solves the problem of troublesome and high cost of ground scaffolding support construction; 2) The support of the present invention can adjust the beam end butt joint to ensure that the butt weld meets the welding design; 3) The support of the present invention can replace the lifting crane after installation, saving the cost of using the lifting crane during the welding construction stage.

[0061] The above description is only a preferred feasible embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made using the contents of the present specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A support for the middle connection point of a long-span box beam, wherein the root parts of a first box beam (1) and a second box beam (2) are respectively connected to a fixed structure, and the ends of the beams are connected via the support, characterized in that: The support includes: A connecting member (3) extending from a beam end of the first box beam (1) to a beam end of the second box beam (2); The connecting member (3) is composed of a first support arm (31) and a second support arm (32), the lower ends of which are welded together to form a V shape, and the upper ends of which are fixedly connected to the hinge ear plate (4); a reinforcing rod (33) is also fixedly connected between the first support arm (31) and the second support arm (32); or the connecting member (3) is an arc-shaped rod (34), and the two ends of the arc-shaped rod (34) are welded to the hinge ear plate (4); or the connecting member (3) is a straight-line flat steel plate (35), and the two ends of the straight-line flat steel plate (35) are formed with holes to form the hinge ear plate (4), and the two straight-line flat steel plates (35) are respectively arranged on both sides of the butt joint position of the two box beams; A hinge ear plate (4) is fixedly connected to both ends of the connecting structure (3) respectively, and an axial hole is arranged on the plate surface, and is rotatably connected to the end of the beam through a rotating shaft (6); The adjusting member (5) is composed of a vertically arranged support (51) and a wedge iron (52); the lower end of the support (51) is welded and fixed to the connecting member (3); the upper end is movably provided with the wedge iron (52); the top of the wedge iron (52) abuts against the bottom surface of the beam end; the adjusting member (5) is installed on the connecting member (3); it is located at the bottom of the box beam and is arranged at the outer end of the corresponding box beam end; the adjusting member (5) supports the outer end of the beam end upwards, thereby adjusting the horizontality of the box beam.

2. The support for the middle connection point of the long-span box beam according to claim 1 is characterized by: When the connecting member (3) is a straight-line flat steel plate (35), a U-shaped vertical frame (351) is fixedly connected below the straight-line flat steel plate (35), the top ends of the vertical beams on both sides of the U-shaped vertical frame (351) are fixedly connected to the ends of the flat steel plate, and the horizontal beam of the U-shaped vertical frame (351) is located below the beam ends.

3. The support for the middle connection point of the long-span box beam according to claim 1, characterized in that: The support column (51) and the wedge iron (52) of the adjusting member (5) are replaced by a jack (53).

4. The support for the middle connection point of the long-span box beam according to claim 1, characterized in that: When the connecting member (3) is a straight-line flat steel plate (35), the adjusting member (5) is replaced by a steel wire rope (55), one end of which is connected to the straight-line flat steel plate (35) on one side via a fixing buckle (56), and the other end is connected to the straight-line flat steel plate (35) on the other side via an adjusting buckle (54). The fixing buckle (56) and the adjusting buckle (54) are respectively arranged on both sides of the beam end. The length of the steel wire rope (55) is adjusted via the adjusting buckle (54), thereby adjusting the height of the outer end of the beam end.

5. The support for the middle connection point of the long-span box beam according to claim 1, characterized in that: The lower side of the beam end is fixedly connected to a hinge seat (7) for mounting the rotating shaft (6); or a sleeve frame is mounted on the beam end, and a shaft hole is provided on the side wall of the sleeve frame for mounting the rotating shaft (6).

6. A construction method using the support device for the middle connection point of the long-span box beam according to claim 1, characterized in that: The first step is to weld a positioning assembly (9) at the top of the steel column (8) according to the design elevation of the box beam; and to weld hinge seats (7) at the lower sides of the beam ends of the first box beam (1) and the second box beam (2). The second step is to connect a hinge ear plate (4) of the support to a hinge seat (7) of the first box beam (1) via a rotating shaft (6); The third step is to use a lifting crane to move the first box beam (1) and the second box beam (2) between the two steel columns (8), place the beam base on the positioning assembly (9) and connect them, and close the beam ends; The fourth step is to rotate the support under the first box beam (1) and connect another hinge ear plate (4) of the support to the hinge seat (7) of the second box beam (2) through another rotating shaft (6); The fifth step is to adjust the elevation of the beam ends by means of a lifting crane, and after the adjustment is completed, support and fix the beam ends by means of an adjusting member (5); then, the hook is removed, so that the weight of the beam ends of the first box beam (1) and the second box beam (2) is completely unloaded onto the support; when the elevation of the beam ends is adjusted by means of the lifting crane, a settlement error is reserved to meet the arching requirement, so as to ensure that the first box beam (1) and the second box beam (2) are horizontal and collinear after the hook is removed.

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