Expansion joint connecting structure component for fixed building, fixed building and expansion joint transformation construction method

Abstract

The invention provides an expansion joint connecting structure component for a fixed building, the fixed building and an expansion joint transformation construction method, and relates to the technical field of building construction. The technical problems that in the prior art, structural connection reliability is poor, and the service life is short are solved. The expansion joint connecting structure component for fixing the building comprises a left middle beam, a right middle beam, a left edge beam, a right edge beam, a front sliding rod, a rear sliding rod, a plurality of left limiting guide boxes, a plurality of right limiting guide boxes, convex columns, clamping jaws and rubber strips, the left limiting guide boxes are welded to the outer side of the left middle beam, and the right limiting guide boxes are welded to the outer side of the right middle beam; the two ends, in the length direction, of the front sliding rod and the rear sliding rod are inserted into the left limiting guide box and the right limiting guide box correspondingly, and gaps exist between the two ends and the inner walls of the left limiting guide box and the right limiting guide box. The connecting structure is good in connecting reliability and long in service life.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to an expansion joint connecting structural component for a fixed building, a fixed building provided with the expansion joint connecting structural component for the fixed building, and an expansion joint reconstruction construction method. Background Art

[0002] Expansion joints for fixed buildings are important components for connecting and sealing expansion joints during construction to ensure the service life of fixed buildings and their resistance to thermal expansion and contraction.

[0003] The existing expansion joint connecting structural components for fixed buildings include two side beams. There is a gap between the two side beams, and the gap forms a single expansion joint. The length directions of the two side beams are parallel to the length direction of the installation groove of the fixed building. The two side beams are each welded to the embedded steel bars fixed at the installation groove of the fixed building, and then the expansion joint formed by the gap between the two side beams is sealed with a rubber strip.

[0004] The applicant has found that the prior art has at least the following technical problems: 1. In the prior art, the two side beams lack deformation correction and guiding structures when deformed under the action of thermal expansion and contraction, resulting in inconsistent widths of expansion joints at different locations after the side beams are deformed. The side beams with large deformation are prone to welding failure and detachment from the embedded steel bars, and the rubber strips are also prone to falling off, resulting in poor structural connection reliability and short service life. 2. In the prior art, the width of a single expansion joint cannot be set too large, otherwise, on the one hand, it will affect the surface flatness and the overall structural strength of the fixed building, resulting in a reduction in the overall structural connection reliability of the fixed building; on the other hand, the rubber strip that seals the expansion joint is a flexible part and cannot be made too wide, otherwise it will collapse and deform under a slight impact, causing sealing failure. Summary of the invention

[0005] The embodiments of the present invention provide an expansion joint connection structural member for a fixed building, a fixed building provided with the expansion joint connection structural member for a fixed building, and an expansion joint reconstruction construction method, which solve the technical problems of poor structural connection reliability and short service life in the prior art.

[0006] The embodiment of the present invention provides the following technical solutions: An embodiment of the present invention provides a structural member for fixing an expansion joint for a building, comprising a left middle beam, a right middle beam, a left beam, a right beam, a front slide bar, a rear slide bar, a left limit guide box, a right limit guide box, a convex column, a claw and a rubber strip, wherein: The length directions of the left middle beam, the right middle beam, the left side beam and the right side beam are parallel to each other, and the left middle beam and the right middle beam are located between the left side beam and the right side beam; there are gaps between the left middle beam and the right middle beam, between the left side beam and the left middle beam, and between the right side beam and the right middle beam, and the gaps form expansion joints, and the rubber strips are embedded in the expansion joints; The clamping claw is in an n-shape and is clamped on the outside of the left beam and the right beam and welded to the left beam and the right beam, and there is a gap between the clamping claw and the left middle beam and the right middle beam; Several left limit guide boxes are welded on the outside of the left middle beam, and several right limit guide boxes are welded on the outside of the right middle beam; the front sliding bar and the rear sliding bar are both welded on the lower surfaces of the left middle beam, the right middle beam, the left beam and the right beam; the length directions of the front sliding bar and the rear sliding bar are perpendicular to the length directions of the left middle beam, the right middle beam, the left beam and the right beam; the two ends of the front sliding bar and the rear sliding bar in the length direction are respectively inserted into the left limit guide box and the right limit guide box, and there are gaps between the two ends and the inner walls of the left limit guide box and the right limit guide box; the left limit guide box and the right limit guide box are both cubic structures, and several convex columns with the same length are fixedly arranged on their respective bottom surfaces and their respective outer wall surfaces perpendicular to the left beam and the right beam.

[0007] Optionally, the fixed building expansion joint connection structural member further includes a left bracket and a right bracket, wherein: the left bracket and the right bracket are both right-angled triangle structures with a larger base (the base is larger than the waist length) and are respectively fixed to the left beam and the right beam through a connecting plate, and bracket connecting steel bars are provided inside the two brackets, and the length direction of the bracket connecting steel bars is parallel to the length directions of the left middle beam, the right middle beam, the left beam and the right beam; The boss includes a cylindrical portion and a circular plate-shaped boss head integrally connected to the cylindrical portion, the cylindrical portion is connected to the outer wall of the left limit guide box or the right limit guide box, the middle portion of the boss head is connected to the cylindrical portion and the outer diameter of the boss head is larger than the cylindrical portion.

[0008] The top cover is a top cover formed by a plurality of holes, the ... The two ends of each sliding bar in the length direction respectively pass through the guide through holes on the inner guide partitions of the guide frames of the left limit guide box and the right limit guide box. The screw parts of the front transverse limiting bolt and the rear transverse limiting bolt are threadedly connected to the outer limit partition, and the bolt heads of the two are facing the ends of the front sliding bar and the rear sliding bar respectively passing through the guide through holes. The screw parts of the front longitudinal limiting bolt are threadedly connected to the front side limiting partition, and the bolt heads of the front longitudinal limiting bolt are facing the ends of the front sliding bar and the rear sliding bar respectively passing through the guide through holes. The front transverse limiting bolt, the rear transverse limiting bolt, the front longitudinal limiting bolt, and the rear longitudinal limiting bolt can be twisted to a position where their respective bolt heads are abutted against the ends of the front sliding bar and the rear sliding bar respectively passing through the guide through holes in the length directions.

[0009] Optionally, the convex columns are evenly distributed on the bottom surfaces of the left limit guide box and the right limit guide box and on the outer wall surfaces of the two that are perpendicular to the left beam and the right beam; and / or, the bottom surface of the bottom box body is located on the inner side of the inner guide partition and is fixedly provided with a plurality of buffer springs and a guide ring with the same number as the buffer springs, the buffer spring is located in the guide ring and the buffer spring is inserted with a support member, the support member includes a support plate and a limit column, one end of the limit column is inserted in the center hole of the buffer spring and there is a gap between the end and the bottom surface of the bottom box body, the other end of the limit column is fixedly connected to the support plate, the support plate is disc-shaped and is slidably connected to the inner wall of the guide ring, and a plurality of support bolts are threadedly connected at the edge of the support plate, the bolt heads of the support bolts abut against the front sliding rod and the rear sliding rod, and the front sliding rod and the rear sliding rod can slide relative to the bolt heads of the support bolts.

[0010] Optionally, the gap between the left middle beam and the right middle beam, the gap between the left beam and the left middle beam, and the gap between the right beam and the right middle beam are of the same size, and the sum ΔL of the three sizes satisfies the following formula: △L=α×(△L1+△L2) △L1=β×L×(Tmax-To) △L2=β×L×(To-Tmin) Where: α is the fixed building expansion coefficient, and its value is 0.4~0.5; △L1 is the elongation caused by the temperature rising to the local maximum temperature, unit: mm; △L2 is the shortening caused by the temperature drop to the local minimum temperature, unit: mm; β is the thermal expansion coefficient of the material used to connect the structural components of the expansion joints used to fix the building, and its value is 10×10 -6 ~12×10 -6 ; L is the sum of the distances from the deformation neutral point of the fixed building to the expansion joint, in mm; Tmax—the maximum effective local temperature, in degrees Celsius; Tmin—Local minimum effective temperature value, unit: ℃; To—Air temperature value at installation time.

[0011] Optionally, the middle portion of the top surface of each of the left middle beam and the right middle beam is provided with an anti-slip groove extending along the entire length direction thereof.

[0012] Optionally, the left beam and the right beam each include a top edge, a side edge and a bottom edge connected in sequence, the width of the bottom edge is greater than that of the top edge, and the bottom edge is welded and fixed to the left limit guide box or the right limit guide box.

[0013] A fixed building provided by an embodiment of the present invention comprises an installation notch and an expansion joint connecting structural member for a fixed building (the fixed building may be a bridge or a road) provided by the above-mentioned embodiment of the present invention installed on the installation notch, wherein the side wall or the bottom surface of the installation notch is fixedly provided with protruding embedded steel bars, the length direction of the embedded steel bars is perpendicular to the length directions of the left middle beam, the right middle beam, the left beam and the right beam, and the embedded steel bars are welded to the left bracket or the right bracket.

[0014] An embodiment of the present invention provides a method for the reconstruction of an expansion joint. The method comprises three stages: a preparation stage, an expansion joint reconstruction stage, and a grouting and curing stage, wherein: The expansion joint reconstruction stage includes the following steps: Step A, dismantling the old expansion joint: dismantling the original expansion joint connecting structural member, and excavating an installation notch with a width of 1.2-1.8 times the overall width of the expansion joint connecting structural member for fixing the building; Step B, processing the embedded steel bars: cleaning the dust and debris in the installation slot, removing the attachments and rust on the embedded steel bars, straightening the twisted embedded steel bars, making the ends of the embedded steel bars extend along the width direction of the installation slot, and reinforcing the damaged embedded steel bars; Step C, installation of new expansion joint: using a lifting tool to lift the clamping claw to place the expansion joint connection structural member for fixing the building to a predetermined position on the embedded steel bar in the installation notch; Step D, reinforcing bar planting operation: drilling holes, cleaning holes, injecting glue, and planting steel bars on the side walls of the installation slot to obtain longitudinal limiting bars extending along the width direction of the installation slot; Step E, steel bar welding operation: weld a plurality of transverse limiting ribs parallel to the length directions of the left middle beam, the right middle beam, the left beam and the right beam on the longitudinal limiting ribs, weld the transverse limiting ribs to the tops of the left limiting guide box and the right limiting guide box, and then saw off the clamping claws.

[0015] Optionally, the diameter and depth of the drilling hole in step D are set according to the following formula: D = d + δ; H = γ × d; Where: D is the diameter of the drill hole for reinforcing bar planting operation, unit: mm; H is the drilling depth for reinforcing bar embedding operation, unit: mm; d is the nominal diameter of the embedded steel bar, mm; δ is the redundancy required for the steel bar planting operation, with a value of 4~10, in units of mm; γ is the depth coefficient of steel bar embedding operation, and its value is 15~20.

[0016] Any of the above technical solutions provided by the embodiments of the present invention produces at least the following technical effects: The expansion joint connecting structural member for fixing buildings provided by the present invention provides space for the front sliding bar and the rear sliding bar to expand and contract along the width direction of the expansion joint, and the front sliding bar and the rear sliding bar are both welded to the lower surfaces of the left middle beam, the right middle beam, the left beam and the right beam, so that the deformation of the left middle beam, the right middle beam, the left beam and the right beam under the action of thermal expansion and contraction will drive the front sliding bar and the rear sliding bar to expand and contract synchronously, and under the guiding, protecting and limiting action of the left and right limiting guide boxes on the front and rear sliding bars, the deformation of the left middle beam, the right middle beam, the left beam and the right beam is also limited, and because of the limitation, even if the expansion joint is deformed at various locations under the action of thermal expansion and contraction, the width of the expansion joint at various locations after the deformation is close to the same, and because the left middle beam, the right middle beam, the left beam and the right beam are subjected to more uniform force at various locations, it is not easy for welding failure to occur and to detach from the embedded steel bars, and the rubber strip is not easy to fall off; At the same time, the expansion joints formed by multiple gaps can ensure that the width of each gap is small, the rubber strip can be made thinner, and the ability to resist impact and crushing is stronger, thus solving the technical problems of poor structural connection reliability and short service life in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Those skilled in the art may better understand the technical effects of the present invention through the following drawings, wherein: Figure 1 A partial schematic diagram of the three-dimensional structure of the expansion joint connecting structural members for fixing buildings provided in an embodiment of the present invention when no rubber strips are installed and the bracket is connected to the steel bars.

[0018] Figure 2 A partial schematic diagram of the three-dimensional structure of a structural member for fixing an expansion joint for a building provided in an embodiment of the present invention, in which a rubber strip has been installed but a bracket for connecting steel bars has not been installed.

[0019] Figure 3 A partial schematic diagram of an expansion joint connection structural member for a fixed building provided in an embodiment of the present invention after being installed in an installation notch of the fixed building.

[0020] Figure 4A partial schematic diagram of an installation notch for fixing a building where an expansion joint connecting structural member for fixing a building provided by an embodiment of the present invention is installed.

[0021] Figure 5 A schematic flow chart of a method for reconstruction of an expansion joint provided in accordance with a preferred embodiment of the present invention.

[0022] Figure 6 It is a partial schematic diagram of the three-dimensional structure of the expansion joint connecting structural components for fixing buildings provided in the preferred implementation mode of the present invention without the rubber strip installed and the bracket connected to the steel bars.

[0023] Figure 7 A schematic diagram of the connection relationship between the front and rear sliding bars of the expansion joint connection structural member for fixing a building provided in a preferred embodiment of the present invention and the parts embedded in the left and right limit guide boxes and the support bolts.

[0024] Markings in the figure: 1, left middle beam; 2, right middle beam; 3, left beam; 4, right beam; 341, top edge; 342, side edge; 343, bottom edge; 5, front slide bar; 6, rear slide bar; 7, left limit guide box; 71, top cover; 72, mounting hole; 73, front longitudinal limit bolt; 74, bottom box body; 741, bottom surface of bottom box body; 742, buffer spring; 743, limit column; 744, support bolt; 745, support plate; 7 46. ​​Guide ring; 75. Front transverse limit bolt; 76. Rear transverse limit bolt; 77. Inner guide baffle; 78. Rear longitudinal limit bolt; 79. Outer limit baffle; 8. Right limit guide box; 9. Boss; 10. Claw; 11. Rubber strip; 12. Left bracket; 13. Right bracket; 14. Anti-slip groove; 15. Installation notch; 16. Concrete filling surface; 17. Embedded steel bars; 18. Longitudinal limit ribs; 19. Transverse limit ribs. DETAILED DESCRIPTION

[0025] The following is combined with the above Figure 1-Figure 7 The preferred implementation modes and various optional implementation schemes provided by the embodiments of the present invention are described in more detail.

[0026] like Figure 1-Figure 7 As shown, an expansion joint connection structural member for fixing a building provided by an embodiment of the present invention comprises a left middle beam 1, a right middle beam 2, a left beam 3, a right beam 4, a front slide bar 5, a rear slide bar 6, a left limit guide box 7, a right limit guide box 8, a boss 9, a claw 10 and a rubber strip 11, wherein: The length directions of the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4 are parallel to each other. The left middle beam 1 and the right middle beam 2 are located between the left beam 3 and the right beam 4. There are gaps between the left middle beam 1 and the right middle beam 2, between the left beam 3 and the left middle beam 1, and between the right beam 4 and the right middle beam 2, and the gaps form expansion joints, and the rubber strips 11 are embedded in the expansion joints. The clamping claw 10 is in an n-shape and is clamped on the outside of the left beam 3 and the right beam 4 and welded to the left beam 3 and the right beam 4. There is a gap between the clamping claw 10 and the left middle beam 1 and the right middle beam 2. A number of left limit guide boxes 7 are welded to the outside of the left middle beam 1, and a number of right limit guide boxes 8 are welded to the outside of the right middle beam 2; both the front slide bar 5 and the rear slide bar 6 are welded to the lower surfaces of the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4; the length directions of the front slide bar 5 and the rear slide bar 6 are perpendicular to the length directions of the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4; the two ends of the front slide bar 5 and the rear slide bar 6 in the length direction are respectively inserted into the left limit guide box 7 and the right limit guide box 8, and there is a gap between the two ends and the inner walls of the left limit guide box 7 and the right limit guide box 8; both the left limit guide box 7 and the right limit guide box 8 are cubic structures, and a number of convex columns 9 of the same length are fixedly arranged on their bottom surfaces and their respective outer wall surfaces perpendicular to the left beam 3 and the right beam 4.

[0027] The expansion joint connecting structural member for fixing buildings provided by the present invention has a left limit guide box 7 and a right limit guide box 8, which provide a space for the front slide bar 5 and the rear slide bar 6 to expand and contract along the width direction of the expansion joint, and the front slide bar 5 and the rear slide bar 6 are both welded to the lower surfaces of the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4, so the deformation of the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4 under the action of thermal expansion and contraction will drive the front slide bar 5 and the rear slide bar 6 to expand and slide synchronously, and the left limit guide box 7 and the right limit guide box 8 are used to connect the front slide bar 5 and the rear slide bar 6. Under the guiding, protecting and limiting effect of the guide box 8 on the front slide bar 5 and the rear slide bar 6, the deformation of the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4 is also limited. Because of the limitation, even if the expansion joint is deformed at various places under the effect of thermal expansion and contraction, the width of the expansion joint after deformation is close to the same. Since the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4 are subjected to more uniform force, it is not easy for welding failure to occur and detach from the embedded steel bar 17, and the rubber strip 11 is not easy to fall off. At the same time, the expansion joint formed by the multiple gaps can ensure that the width of each gap is small, the rubber strip 11 can be made thinner, and the ability to resist impact and rolling is stronger.

[0028] As an optional implementation, the expansion joint connection structural member for fixing buildings in this embodiment further includes a left bracket 12 and a right bracket 13, wherein: the left bracket 12 and the right bracket 13 are both right-angled triangle structures with a larger bottom side 343 and are respectively fixed to the left beam 3 and the right beam 4 through a connecting plate, and bracket connecting steel bars are provided inside the two, and the length direction of the bracket connecting steel bars is parallel to the length directions of the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4; The boss 9 includes a cylindrical portion and a circular plate-shaped boss head integrally connected to the cylindrical portion. The cylindrical portion is connected to the outer wall of the left limit guide box 7 or the right limit guide box 8. The middle part of the boss head is connected to the cylindrical portion and the outer diameter of the boss head is larger than the cylindrical portion.

[0029] On the one hand, the left bracket 12 and the right bracket 13 act as connecting media between the left beam 3 and the right beam 4 and the embedded steel bars 17 of the installation groove 15. At the same time, the large internal space of the left bracket 12 and the right bracket 13 is conducive to welding and setting the laterally extending bracket connecting steel bars; on the other hand, it has a certain shock-absorbing and buffering effect on the impact force borne by the left beam 3 and the right beam 4, ensuring the connection reliability and service life of the present invention.

[0030] As an optional implementation, in this embodiment, the gaps between adjacent bosses 9 have the same size. This structure is relatively regular, which facilitates the implementation of manufacturing and connection operations.

[0031] As an optional implementation, in this embodiment, both the front slide bar 5 and the rear slide bar 6 are rectangular hollow structures. The left limit guide box and the right limit guide box each include a bottom box body 74, a guide frame located in the bottom box body 74, a transverse limit bolt, a longitudinal limit bolt and a top cover 71. A plurality of mounting holes 72 are arranged at the edge of the top cover 71. The top of the side wall of the bottom box body 74 is provided with screw holes of the same number as the mounting holes 72, and a plurality of connecting screws that penetrate the mounting holes and are threadedly connected to the screw holes are provided. The top cover 71 and the bottom box body 74 are detachably connected together by nails, and the top of the connecting screw is flush with the top surface of the top cover 71, and the guide frame is welded and fixed in the bottom box body 74; the transverse limiting bolts include front transverse limiting bolts 75 and rear transverse limiting bolts 76, and the longitudinal limiting bolts include front longitudinal limiting bolts 73 and rear longitudinal limiting bolts 78. The guide frame is in a square frame shape and includes an inner guide partition 77, an outer limiting partition 79, a front limiting partition and a rear limiting partition. The front slide bar 5 The two ends of the rear slide bar 6 in the length direction respectively pass through the guide through holes on the inner guide partitions 77 of the guide frames of the left limit guide box 7 and the right limit guide box 8, and the screw portions of the front transverse limiting bolt 75 and the rear transverse limiting bolt 76 are threadedly connected to the outer limit limiting partitions 79 and the bolt heads of the two are facing the ends of the guide through holes of the front slide bar 5 and the rear slide bar 6 respectively. The screw portion of the front longitudinal limiting bolt 73 is threadedly connected to the front side limiting partition and the bolt head of the front longitudinal limiting bolt 73 is facing the end of the guide through hole of the front slide bar 5, and the screw portion of the rear longitudinal limiting bolt 78 is threadedly connected to the rear side limiting partition and the bolt head of the rear longitudinal limiting bolt 78 is facing the end of the guide through hole of the rear slide bar 6. By twisting the front transverse limiting bolt 75, the rear transverse limiting bolt 76, the front longitudinal limiting bolt 73, and the rear longitudinal limiting bolt 78, their respective bolt heads can be twisted to abut against the ends of the guide through holes in the length directions of the front slide bar 5 and the rear slide bar 6.

[0032] In the initial state, there is enough clearance between the transverse limit bolts, the longitudinal limit bolts and the front slide bar 5 and the rear slide bar 6 to ensure that the front slide bar 5 and the rear slide bar 6 have enough expansion space along the width direction of the expansion joint. If the deformation of the expansion joint exceeds the ideal size after a period of use, the top cover 71 can be disassembled, and the transverse limit bolts and the longitudinal limit bolts can be twisted. The bolt heads of the transverse limit bolts and the longitudinal limit bolts can be used to apply a resisting force to the front slide bar 5 and the rear slide bar 6 in the transverse and longitudinal directions respectively to adjust the positions of the front slide bar 5 and the rear slide bar 6. The size of the expansion joint can be adjusted by adjusting the positions of the front slide bar 5 and the rear slide bar 6, thereby ensuring that the expansion joint meets the ideal size for a long time.

[0033] As an optional implementation, in this embodiment, the bottom surface 741 of the bottom box body 74 located on the inner side of the inner guide partition 77 is fixedly provided with a plurality of buffer springs 742 and a guide ring 746 with the same number as the buffer springs 742. The buffer spring 742 is located in the guide ring 746 and the buffer spring 742 is inserted with a support member, the support member includes a support plate 745 and a limiting column 743, one end of the limiting column 743 is inserted into the center hole of the buffer spring 742 and there is a gap between the end and the bottom surface of the bottom box body 74, the other end of the limiting column 743 is fixedly connected to the support plate 745, the support plate 745 is disc-shaped and is slidably connected to the inner wall of the guide ring 746, and a plurality of support bolts 744 are threadedly connected at the edge of the support plate 745, the bolt heads of the support bolts 744 abut against the front sliding rod 5 and the rear sliding rod 6, and the front sliding rod 5 and the rear sliding rod 6 can slide relative to the bolt heads of the support bolts 744.

[0034] The buffer spring 742 can have a certain shock-absorbing and buffering effect on the front slide bar 5 and the rear slide bar 6, thereby ensuring that the expansion joint has a certain elastic expansion and contraction force. When the front slide bar 5 and the rear slide bar 6 are too low in the vertical direction, their height positions can be adjusted by twisting the support bolts 744, thereby ensuring that the front slide bar 5 and the rear slide bar 6 as well as the left middle beam 1, the right middle beam 2, the left beam 3, and the right beam 4 all have precise height positions.

[0035] As an optional implementation, in this embodiment, the bosses 9 are evenly distributed on the bottom surfaces of the left limit guide box 7 and the left limit guide box 7 and the outer wall surfaces of the left limit guide box 7 that are perpendicular to the left beam 3 and the right beam 4. This design is conducive to uniform force at all locations of the left limit guide box 7 and the left limit guide box 7 where the bosses 9 are arranged.

[0036] As an optional implementation, in this embodiment, the gap between the left middle beam 1 and the right middle beam 2, the gap between the left beam 3 and the left middle beam 1, and the gap between the right beam 4 and the right middle beam 2 are the same in size, and the sum of the three sizes △L satisfies the following formula: △L=α×(△L1+△L2) △L1=β×L×(Tmax-To) △L2=β×L×(To-Tmin) Where: α is the fixed building expansion coefficient, and its value is 0.4~0.5 (preferably the middle value); △L1 is the elongation caused by the temperature rising to the local maximum temperature, unit: mm; △L2 is the shortening caused by the temperature drop to the local minimum temperature, unit: mm; β is the thermal expansion coefficient of the material used to connect the structural components of the expansion joints used to fix the building, and its value is 10×10 -6~12×10 -6 (Preferably take the middle value); concrete β is 10×10 -6 , steel structure β is 12×10 -6 ; L is the sum of the distances from the deformation neutral point of the fixed building to the expansion joint, in mm; Tmax—the maximum effective local temperature, in degrees Celsius; Tmin—Local minimum effective temperature value, unit: ℃; To—Air temperature value at installation time.

[0037] The expansion joint size obtained by the above formula can meet the needs of deformation of fixed buildings due to thermal expansion and contraction, ensuring the overall structural strength of the fixed building.

[0038] As an optional implementation, in this embodiment, the middle of the top surface of each of the left middle beam 1 and the right middle beam 2 is provided with an anti-skid groove 14 extending along the entire length direction thereof. The function of the anti-skid groove 14 is to increase the friction force of the left middle beam 1 and the right middle beam 2. When the fixed building is a bridge, the anti-skid groove 14 on the left middle beam 1 and the right middle beam 2 can prevent the passing vehicles from slipping and causing traffic accidents.

[0039] As an optional implementation, the left beam 3 and the right beam 4 in this embodiment each include a top edge 341, a side edge 342 and a bottom edge 343 connected in sequence, the width of the bottom edge 343 is greater than the top edge 341, and the bottom edge 343 is welded and fixed to the left limit guide box 7 or the right limit guide box 8. This structure forms a structure with a wide bottom edge 343 and a narrow top edge 341. Since the bottom edge 343 has a larger contact area, the overall stability and structural strength are more ideal.

[0040] A fixed building provided by an embodiment of the present invention comprises an installation slot 15 and a structural member for connecting a fixed building (the fixed building may be a bridge or a road) provided by the above-mentioned embodiment of the present invention installed on the installation slot 15, and a protruding embedded steel bar 17 is fixedly provided on the side wall or bottom surface of the installation slot 15, and the length direction of the embedded steel bar 17 is perpendicular to the length directions of the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4, and the embedded steel bar 17 is welded to the left bracket 12 or the right bracket 13.

[0041] The present invention is suitable for replacing the original expansion joint connection structural components of a fixed building. The embedded steel bars 17 are the original steel bars of the fixed building. Using the original steel bars is beneficial to saving resources and saving construction time.

[0042] An embodiment of the present invention provides a method for the reconstruction of an expansion joint. The method comprises three stages: a preparation stage, an expansion joint reconstruction stage, and a grouting and curing stage, wherein: The expansion joint renovation phase includes the following steps: Step A, dismantling of old expansion joints: dismantling the original expansion joint connecting structural components, and excavating an installation notch 15 with a width of 1.2-1.8 times the overall width of the expansion joint connecting structural components for fixed buildings; Step B, processing the embedded steel bars 17: cleaning the dust and debris in the installation slot 15, removing the attachments and rust on the embedded steel bars 17, straightening the twisted embedded steel bars 17, making the ends of the embedded steel bars 17 extend along the width direction of the installation slot 15, and reinforcing the damaged embedded steel bars 17; Step C, installation of new expansion joint: using a lifting tool through a lifting claw 10 to place the fixed building expansion joint connection structural member into a predetermined position on the embedded steel bar 17 in the installation notch 15; Step D, reinforcing bar planting operation: drilling holes, cleaning holes, injecting glue, and planting steel bars on the side walls of the installation slot 15 to obtain longitudinal limiting bars 18 extending along the width direction of the installation slot 15; Step E, steel bar welding operation: weld a plurality of transverse limiting ribs 19 parallel to the length direction of the left middle beam 1, the right middle beam 2, the left beam 3 and the right beam 4 on the longitudinal limiting ribs 18, weld the transverse limiting ribs 19 to the top of the left limiting guide box 7 and the right limiting guide box 8, and saw off the claws 10.

[0043] As an optional implementation, the diameter and depth of the drill hole in step D of this embodiment are set according to the following formula: D=d+δ; H=γ×d; where: D is the drill hole diameter for the steel bar planting operation, unit: mm; H is the drilling depth for reinforcing bar embedding operation, unit: mm; d is the nominal diameter of the embedded steel bar, mm; δ is the redundancy required for the steel bar embedding operation, with a value of 4~10 (preferably the middle value), unit: mm; γ is the depth coefficient of the steel bar embedding operation, with a value of 15~20 (preferably the middle value).

[0044] When selecting the drilling hole diameter for rebar embedding, it is necessary to ensure that the hole diameter is slightly larger than the diameter of the rebar to ensure that the embedding glue can fully fill the hole and tightly wrap the rebar while providing sufficient bonding strength.

[0045] During the rebar planting construction process, the construction workers drill holes after determining the location according to the drawings. Generally, an impact hammer or a water drill is used to make holes, and a suitable drilling bit is selected. The drill bit diameter is generally slightly larger than the diameter of the steel bar. Both the drilling diameter and the drilling depth need to ensure that the planted steel bars reach yield until they are pulled out. If the hole diameter is too small, the amount of rebar planting glue poured will be too small, and the bonding strength will not meet the requirements and will not pass the subsequent pull-out test. A large hole diameter does not mean that the more rebar planting glue, the better the bonding force. In actual engineering, the elastic modulus of the adhesive is small, and a large hole diameter will lead to increased slippage of the structural system. This will not only increase the amount of rebar planting glue used and the difficulty of drilling, waste reinforcement materials, and increase the cost of the project, but will also significantly reduce the strength of the original structure and cause greater damage.

[0046] Taking into account the changes in rebar embedding glue under long-term load, the difficulty and economy of rebar embedding construction, and combining numerical simulation research with multiple construction site experiences, the key parameters of drilling diameter and drilling depth can be set according to the above formula.

[0047] The above technical solutions are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A structural member connected by an expansion joint for a fixed building, characterized in that: It includes a left middle beam, a right middle beam, a left beam, a right beam, a front slide bar, a rear slide bar, a left limit guide box, a right limit guide box, a boss, a claw and a rubber strip, wherein: The length directions of the left middle beam, the right middle beam, the left side beam and the right side beam are parallel to each other, and the left middle beam and the right middle beam are located between the left side beam and the right side beam; there are gaps between the left middle beam and the right middle beam, between the left side beam and the left middle beam, and between the right side beam and the right middle beam, and the gaps form expansion joints, and the rubber strips are embedded in the expansion joints; The clamping claw is in an n-shape and is clamped on the outside of the left beam and the right beam and welded to the left beam and the right beam, and there is a gap between the clamping claw and the left middle beam and the right middle beam; Several left limit guide boxes are welded on the outside of the left middle beam, and several right limit guide boxes are welded on the outside of the right middle beam; the front sliding bar and the rear sliding bar are both welded on the lower surfaces of the left middle beam, the right middle beam, the left beam and the right beam; the length directions of the front sliding bar and the rear sliding bar are perpendicular to the length directions of the left middle beam, the right middle beam, the left beam and the right beam; the two ends of the front sliding bar and the rear sliding bar in the length direction are respectively inserted into the left limit guide box and the right limit guide box, and there are gaps between the two ends and the inner walls of the left limit guide box and the right limit guide box; the left limit guide box and the right limit guide box are both cubic structures, and several convex columns with the same length are fixedly arranged on their respective bottom surfaces and their respective outer wall surfaces perpendicular to the left beam and the right beam.

2. The expansion joint connection structural member for fixing buildings according to claim 1, characterized in that: The fixed building expansion joint connection structural member further comprises a left bracket and a right bracket, wherein: The left bracket and the right bracket are both right-angled triangle structures with larger bases and are respectively fixed to the left beam and the right beam through connecting plates. At the same time, bracket connecting steel bars are provided inside the two brackets. The length direction of the bracket connecting steel bars is parallel to the length directions of the left middle beam, the right middle beam, the left beam and the right beam. The boss includes a cylindrical portion and a circular plate-shaped boss head integrally connected to the cylindrical portion, the cylindrical portion is connected to the outer wall of the left limit guide box or the right limit guide box, the middle portion of the boss head is connected to the cylindrical portion and the outer diameter of the boss head is larger than the cylindrical portion.

3. The expansion joint connection structural member for fixing buildings according to claim 2, characterized in that: The gaps between adjacent protrusions are of the same size; and / or, the front sliding bar and the rear sliding bar are both rectangular hollow structures, the left limit guide box and the right limit guide box each comprise a bottom box body, a guide frame located in the bottom box body, a transverse limit bolt, a longitudinal limit bolt and a top cover, a plurality of mounting holes are arranged at the edge of the top cover, a number of screw holes corresponding to the mounting holes are arranged on the top of the side wall of the bottom box body, a number of connecting screws that penetrate the mounting holes and are threadedly connected to the screw holes connect the top cover to the bottom box body detachably, and the top of the connecting screw is flush with the top surface of the top cover, and the guide frame is welded and fixed to the bottom box body; the transverse limit bolt comprises a front transverse limit bolt and a rear transverse limit bolt, the longitudinal limit bolt comprises a front longitudinal limit bolt and a rear longitudinal limit bolt, the guide frame is in a square frame shape and comprises an inner guide partition, an outer limit partition, a front limit partition and a rear limit partition, the front sliding bar and the rear sliding bar The two ends of each length direction respectively pass through the guide through holes on the inner guide partitions of the guide frames of the left limit guide box and the right limit guide box, respectively, and the screw parts of the front transverse limit bolt and the rear transverse limit bolt are threadedly connected to the outer limit partition, and the respective bolt heads of the two are facing the ends of the front sliding bar and the rear sliding bar respectively passing through the guide through holes. The screw parts of the front longitudinal limit bolt are threadedly connected to the front side limit partition, and the bolt heads of the front longitudinal limit bolt are facing the ends of the front sliding bar and the rear sliding bar respectively passing through the guide through holes. The front transverse limit bolt, the rear transverse limit bolt, the front longitudinal limit bolt, and the rear longitudinal limit bolt can be twisted to a position where their respective bolt heads are abutted against the ends of the front sliding bar and the rear sliding bar respectively passing through the guide through holes in the length directions.

4. The expansion joint connection structural member for fixing buildings according to claim 3, characterized in that: The convex columns are evenly distributed on the bottom surfaces of the left limit guide box and the right limit guide box and on the outer wall surfaces of the two that are perpendicular to the left beam and the right beam; and / or, the bottom surface of the bottom box body is located on the inner side of the inner guide partition and is fixedly provided with a plurality of buffer springs and a guide ring with the same number of buffer springs, the buffer spring is located in the guide ring and the buffer spring is inserted with a support member, the support member includes a support plate and a limit column, one end of the limit column is inserted in the center hole of the buffer spring and there is a gap between the end and the bottom surface of the bottom box body, the other end of the limit column is fixedly connected to the support plate, the support plate is disc-shaped and is slidably connected to the inner wall of the guide ring, and a plurality of support bolts are threadedly connected at the edge of the support plate, the bolt heads of the support bolts abut against the front sliding rod and the rear sliding rod, and the front sliding rod and the rear sliding rod can slide relative to the bolt heads of the support bolts.

5. The expansion joint connection structural member for fixing buildings according to claim 2, characterized in that: The gap between the left middle beam and the right middle beam, the gap between the left beam and the left middle beam, and the gap between the right beam and the right middle beam are of the same size, and the sum of the sizes ΔL satisfies the following formula: △L=α×(△L1+△L2) △L1=β×L×(Tmax-To) △L2=β×L×(To-Tmin) Where: α is the fixed building expansion coefficient, and its value is 0.4~0.5; △L1 is the elongation caused by the temperature rising to the local maximum temperature, unit: mm; △L2 is the shortening caused by the temperature drop to the local minimum temperature, unit: mm; β is the thermal expansion coefficient of the material used to connect the structural components of the expansion joints used to fix the building, and its value is 10×10 -6 ~12×10 -6 ; L is the sum of the distances from the deformation neutral point of the fixed building to the expansion joint, in mm; Tmax—the maximum effective local temperature, in degrees Celsius; Tmin—Local minimum effective temperature value, unit: ℃; To—Air temperature value at installation time.

6. The expansion joint connection structural member for fixing buildings according to claim 2, characterized in that: The middle part of the top surface of each of the left middle beam and the right middle beam is provided with an anti-slip groove extending along the entire length direction thereof.

7. The expansion joint connection structural member for fixing buildings according to claim 2, characterized in that: The left beam and the right beam each include a top edge, a side edge and a bottom edge which are sequentially connected as one body, the bottom edge has a width dimension greater than the top edge, and the bottom edge is welded and fixed to the left limit guide box or the right limit guide box.

8. A fixed building, characterized in that: It comprises an installation slot and a structural member for fixing expansion joints for buildings as described in any one of claims 2 to 7 installed on the installation slot, wherein the side wall or the bottom surface of the installation slot is fixedly provided with protruding embedded steel bars, the length direction of the embedded steel bars is perpendicular to the length directions of the left middle beam, the right middle beam, the left beam and the right beam, and the embedded steel bars are welded to the left bracket or the right bracket.

9. A method for reconstruction of expansion joints, characterized in that: The three stages of this method are: preparation stage, expansion joint reconstruction stage and grouting maintenance stage, among which: The expansion joint reconstruction stage includes the following steps: Step A, dismantling the old expansion joint: dismantling the original expansion joint connecting structural member, and excavating an installation notch with a width of 1.2-1.8 times the overall width of the expansion joint connecting structural member for fixing a building according to any one of claims 1-7; Step B, processing the embedded steel bars: cleaning the dust and debris in the installation slot, removing the attachments and rust on the embedded steel bars, straightening the twisted embedded steel bars, making the ends of the embedded steel bars extend along the width direction of the installation slot, and reinforcing the damaged embedded steel bars; Step C, installation of new expansion joint: using a lifting tool to lift the clamping claw to place the expansion joint connection structural member for fixing the building to a predetermined position on the embedded steel bar in the installation notch; Step D, reinforcing bar planting operation: drilling holes, cleaning holes, injecting glue, and planting steel bars on the side walls of the installation slot to obtain longitudinal limiting bars extending along the width direction of the installation slot; Step E, steel bar welding operation: weld a plurality of transverse limiting ribs parallel to the length directions of the left middle beam, the right middle beam, the left beam and the right beam on the longitudinal limiting ribs, weld the transverse limiting ribs to the tops of the left limiting guide box and the right limiting guide box, and then saw off the clamping claws.

10. The expansion joint reconstruction construction method according to claim 9, characterized in that: The diameter and depth of the drilled hole in step D are set according to the following formula: D = d + δ; H = γ × d; Where: D is the diameter of the drill hole for reinforcing bar planting operation, unit: mm; H is the drilling depth for reinforcing bar embedding operation, unit: mm; d is the nominal diameter of the embedded steel bar, mm; δ is the redundancy required for the steel bar planting operation, with a value of 4~10, in units of mm; γ is the depth coefficient of steel bar embedding operation, and its value is 15~20.

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