Metal expansion device for bridge

Abstract

The utility model provides a metal expansion device for a bridge. The bridge metal telescopic device comprises a profiled bar and a water stop strip, an inner groove and an outer groove are formed in the two opposite sides of the profiled bar respectively, and a pressing strip is arranged in the inner groove and abuts against the water stop strip. The cross section of the pressing strip is of a T-shaped structure, the tail of the pressing strip is close to the deep end of the inner groove and fixedly connected with the top of the profiled bar, and the head of the pressing strip is close to the open end of the inner groove and fixedly connected with the top of the profiled bar. One end of the head of the pressing strip abuts against the inner wall of the upper side of the inner groove, and the other end of the head of the pressing strip abuts against the water stop strip and the inner wall of the lower side of the inner groove in sequence. According to the bridge metal expansion device, the defects that an existing metal expansion joint is prone to damage, unstable in clamping, insufficient in water resistance and the like are overcome.

Description

Technical Field

[0001] This utility model relates to the field of bridge expansion joints, specifically to a bridge metal expansion device. Background Technology

[0002] Bridge expansion joints are devices used for the expansion and contraction of bridge beams and for waterproofing. Bridge decks expand and contract with temperature changes, and to prevent damage, gaps are maintained along the length of the bridge. Expansion joints are used to fill these gaps to prevent water and debris from flowing onto the lower piers. Therefore, bridge expansion joints play a crucial role in the expansion and contraction performance and waterproofing of bridge ends, and their quality and waterproofing performance directly affect the bridge's service life. Currently, most bridge expansion joints consist of embedded parts, waterstop strips (curved stainless steel plates, rubber bodies, polyurethane elastomers, etc.), profiles (aluminum alloys, etc.), nuts, and washers.

[0003] Currently, the most widely used bridge expansion joints are mainly made of polymer elastomers such as rubber and polyurethane. However, these materials have poor durability and are prone to aging after a period of use, leading to failure at the joint connection and potential detachment of the elastomer expansion joint. Metal expansion joints offer better stability and durability compared to elastomer expansion joints.

[0004] The main technical solution for commonly used metal expansion joint devices is to drill connection holes in the waterstop strip and connect it to the bridge structure using bolts or screws. However, the waterstop strip is generally quite thin, and during long-term expansion and contraction of the bridge, it is prone to cracking at the connection holes, leading to connection failure, leakage in the expansion joint, and affecting its performance. Furthermore, the bolts are prone to loosening and require frequent maintenance.

[0005] A search revealed existing Chinese patents, including one with application number "202121237590.1" and titled "Bridge Expansion Joint," filed with China Railway Design Group Co., Ltd., which disclose technical solutions of the same category as this application. Specifically, these patents disclose solutions using U-shaped or V-shaped waterstop strips, with both sides of the waterstop strip riveted to the profile using pressure strips. However, these solutions are not perfect and still have the following problems:

[0006] The waterstop strip is formed and bent at large angles and with large bending ranges. After being subjected to long-term repeated stretching, the bending position is prone to fatigue and damage.

[0007] The waterstop strip is pressed together with a pressure strip. The pressure strip has holes and is connected to the profile with rivets. The rivets need to overcome the friction on both sides. The force acting on the waterstop strip is limited. After the waterstop strip is subjected to long-term repeated pulling, there is a risk of it loosening and falling off. Utility Model Content

[0008] To address the shortcomings of existing metal expansion joints, such as easy damage, unstable clamping, and insufficient waterproofing, this utility model provides a bridge metal expansion device that solves the above problems.

[0009] A bridge metal expansion joint includes a profile and a waterstop strip. The profile has an inner groove and an outer groove on opposite sides. A pressure strip is provided in the inner groove and abuts against the waterstop strip. The pressure strip has a T-shaped cross-section. The tail of the pressure strip is close to the deep end of the inner groove and is fixedly connected to the top of the profile. The head of the pressure strip is close to the opening end of the inner groove. One end of the head of the pressure strip abuts against the upper inner wall of the inner groove, and the other end abuts against the waterstop strip and the lower inner wall of the inner groove in sequence.

[0010] In a preferred embodiment of the bridge metal expansion joint provided by this utility model, the tail of the pressure strip is provided with a through hole, the top of the inner groove is provided with a through hole penetrating the outside of the profile, and a connecting mechanism is provided between the through holes of the two to achieve a fixed connection.

[0011] In a preferred embodiment of the bridge metal expansion joint provided by this utility model, the through hole of the pressure strip and the through hole of the inner groove are connected by rivets.

[0012] In a preferred embodiment of the bridge metal expansion joint provided by this utility model, the opening end of the inner groove is provided with abutment bars on both sides of the inner wall, and the abutment bars are slopes on the adjacent sides, and the slopes are slopes that gradually slope downwards from the inside to the outside.

[0013] The upper abutment bar has a protrusion at the slope position; the head of the pressure bar has a recess at the position where it contacts the upper abutment bar, which is adapted to the protrusion of the upper abutment bar; the slope inclination angle of the lower abutment bar is greater than that of the upper abutment bar.

[0014] In a preferred embodiment of the bridge metal expansion joint provided by this utility model, the cross-section of the waterstop strip is U-shaped, and its two sides extend outward and upward at an obtuse angle. The pressure edge extends into the space between the pressure strip and the lower abutment strip, and the pressure strip, the pressure edge and the lower abutment strip are pressed together in sequence.

[0015] The outer side of the pressing edge extends downward with an acute angle; the bottom of the inner groove is provided with a hook edge groove, and the hook edge extends into the hook edge groove.

[0016] In a preferred embodiment of the bridge metal expansion joint provided by this utility model, the waterstop strip, the pressing edge and the hook edge are sequentially attached to the outer wall of the profile, the surface of the lower abutment strip and the inner wall of the hook edge groove.

[0017] Compared with existing technologies, the bridge metal expansion joint provided by this utility model has the following beneficial effects:

[0018] 1. This utility model adopts a solution of clamping the waterstop strip with a pressure strip and a profile, which avoids the defects of cracking of the waterstop strip and easy loosening of the bolts caused by bolt connection.

[0019] 2. The main body of the waterstop strip used in this utility model is U-shaped, with only small angles bent on both sides to form pressing edges. In the area under stress, that is, the area between the pressing edges, the structure is arc-shaped or obtuse-angled, without obvious bending, resulting in less damage to the metal structure and better fatigue resistance.

[0020] 3. In this utility model, the groove for installing the waterstop strip is set on the side of the profile, and the upper and lower edges of the opening are both set as downward sloping surfaces to form an eaves-like structure, which helps drainage. Without setting sealing gaskets or other mechanisms, a good waterproof effect can be obtained, preventing the rivets, waterstop strips and other structures inside the profile from rusting.

[0021] 4. The pressure strip in this utility model adopts a T-shaped structure, with a rivet connected to the tail end as the force application end. The upper part is connected to the profile to form a turning point, and the lower part is pressed against the waterstop strip, so that the tension of the rivet is entirely applied to the expansion joint in the form of rotational torque, thereby obtaining a better pressing effect.

[0022] 5. The pressure strip in this utility model has an extended tail end to form a force-saving lever structure, which increases the rotational torque and further amplifies the pressure acting on the waterstop strip, making the installation more secure. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of a bridge metal expansion joint;

[0024] Figure 2 This is a partial view of the front of the waterstop strip;

[0025] Figure 3 Is it the waterstop strip? Figure 2 The top view shown is a partial view.

[0026] Figure 4 yes Figure 3 Sectional view along axis AA;

[0027] Figure 5 This is a top view (partial) of the profile.

[0028] Figure 6 yes Figure 5 BB-direction sectional view;

[0029] Figure 7 This is a top view (partial view) of the molding strip;

[0030] Figure 8 yes Figure 7 CC-direction sectional view;

[0031] Figure 9 yes Figure 1 A magnified view of a portion of the image;

[0032] Figure 10 This is a structural diagram of the profile before riveting.

[0033] Figure 11 This is a schematic diagram of the structure after riveting irregular profiles.

[0034] Numbering on the map:

[0035] Waterstop strip 1, waterstop strip body 11, raised end 111, pressing edge 12, hook edge 13;

[0036] Anchor bar 2, connecting section 21;

[0037] 3. Special profile, inner groove, upper abutment strip, lower abutment strip, hook edge groove, outer groove, upper hole, pressure strip, pressure point, turning point, lower hole, locking nut, washer, connecting nut;

[0038] 4. Rivet 41. Inner core 42. Protrusion 42. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0040] Please see Figure 1 This is a cross-sectional view of the bridge metal expansion joint provided by this utility model. The bridge metal expansion joint includes a waterstop strip 1, an anchoring bar 2, and a profile 3.

[0041] Two profiles 3 are installed on the top surface of the bridge body on both sides of the expansion joint. Multiple anchor bars 2 are embedded in the bridge body on the outer side to achieve fixation, and waterstop strips 1 are connected on the inner side.

[0042] Please also refer to Figures 2 to 4 These are, respectively, the front view and top view of a partial location of the waterstop strip 1 in the bridge metal expansion joint provided by this utility model, and its sectional view.

[0043] Waterstop strip 1 is made of bent stainless steel plate. From... Figure 4Looking at the cross-section of the waterstop strip 1, the main body 11 of the waterstop strip has a U-shaped structure, with both sides bent upwards at an angle of 45°, that is, bent at an angle of 135° with the main body, forming the pressing edge 12. The two sides of the pressing edge 12 are bent vertically downwards, that is, bent at an angle of 45° with the pressing edge 12, forming the hook edge 13.

[0044] The waterstop strip 1 has a structure with both ends raised or one end raised and the other end sloping downwards along its length, serving to waterproof or drain the ends. The illustration shows the raised end 111.

[0045] Please also refer to Figures 5 to 6 These are, respectively, a top view and a cross-sectional view of a partial location of the profile 3 in the bridge metal expansion joint provided by this utility model.

[0046] Profile 3 is a long, narrow aluminum profile. Figure 6 Looking at the cross-section of profile 3, profile 3 has a trapezoidal opening on the left side for connecting anchor bars 2, referred to as outer groove 33; and a square opening on the right side for installing pressure strip 35, referred to as inner groove 31.

[0047] On the top left side of the inner groove 31, there are multiple through holes, denoted as upper holes 34, evenly spaced along the length direction, penetrating the profile 3. The upper and lower inner walls on the far right side of the inner groove 31 both protrude inward, serving as upper abutment 311 and lower abutment 312 respectively. Both upper abutment 311 and lower abutment 312 slope downward to the right on their adjacent surfaces. Among them, upper abutment 311 is slightly protruding on the inclined surface, i.e., the lower left position; the slope angle of lower abutment 312 is greater than that of upper abutment 311.

[0048] The bottom right side of the inner groove 31 has a narrow groove for installing the hook edge 13 of the waterstop strip 11, referred to as the hook edge groove 32. The right side of the hook edge groove 32 is aligned with the left side of the lower abutment strip 312.

[0049] Please also refer to Figures 7 to 8 These are, respectively, a top view and a cross-sectional view of a partial location of the pressure strip 35 in the bridge metal expansion joint provided by this utility model.

[0050] The pressure strip 35 is a long strip of aluminum profile. Figure 8 Looking at the cross-section of the pressure strip 35, its structure is roughly T-shaped. The shapes of the upper right and lower right positions match the shapes of the upper right and lower right positions of the inner groove 31, respectively. That is, the upper right position slopes downward to the right, and the slope is slightly concave, while the lower right position slopes downward to the right, and the angle of inclination is greater than that of the upper right position.

[0051] For ease of description, the lower right position of the pressure strip 35 is designated as pressure point 351, and the upper right position is designated as turning point 352. On the left side of the pressure strip 35, there are multiple through holes that penetrate the pressure strip 35 at equal intervals along its length, designated as lower holes 353.

[0052] Please also refer to Figures 9 to 11 These are enlarged views of the left side of the cross-sectional view of the bridge metal expansion joint provided by this utility model, and structural schematic diagrams of the profile 3 before and after the riveting operation.

[0053] Multiple connecting nuts 38 are placed in the outer groove 33. The connecting nuts 38 are tapered nuts that fit into the outer groove 33. The anchor bar 2 has a threaded connecting section 21 at its end. During installation, first screw the locking nut 36 into the connecting section 21 and put on the washer 37. Then screw the connecting section 21 into the connecting nut 38. Finally, tighten the locking nut 36 so that the connecting nut 38 and the locking nut 36 pull against each other to fix the anchor bar 2.

[0054] First, place the waterstop strip 1 in the inner groove 31.

[0055] The hook edge 13 of the waterstop strip 1 is hung in the hook edge groove 32, and the pressing edge 12 is pressed against the lower abutment strip 312. At this time, the waterstop strip body 11, the pressing edge 12 and the hook edge 13 are in sequence attached to the outer wall of the profile 3, the surface of the lower abutment strip 312 and the inner wall of the hook edge groove 32.

[0056] Then place the pressure block 35.

[0057] Align pivot point 352 with upper abutment strip 311, pressure point 351 with pressure edge 12, and align lower hole 353 and upper hole 34. Take multiple rivets 4 and insert them sequentially into each lower hole 353 and upper hole 34. Use a tool to pull out the inner core 41 of the rivet 4, causing the lower end of the rivet 4 to form a protrusion 42, which in turn moves the left end of pressure block 35 upward. Rotate the right end of pressure block 35 clockwise around pivot point 352, causing pressure point 351 to press pressure edge 12 firmly.

[0058] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A bridge metal expansion joint, characterized in that: The device includes a profile and a waterstop strip. The profile has an inner groove and an outer groove on opposite sides. A pressure strip is provided in the inner groove and abuts against the waterstop strip. The pressure strip has a T-shaped cross-section. The tail of the pressure strip is close to the deep end of the inner groove and is fixedly connected to the top of the profile. The head of the pressure strip is close to the opening end of the inner groove. One end of the head of the pressure strip abuts against the upper inner wall of the inner groove, and the other end abuts against the waterstop strip and the lower inner wall of the inner groove in sequence.

2. The bridge metal expansion joint according to claim 1, characterized in that: The tail of the pressure strip is provided with a through hole, and the top of the inner groove is provided with a through hole that penetrates the outside of the profile. A connecting mechanism is provided between the through holes of the two to achieve a fixed connection.

3. The bridge metal expansion joint according to claim 2, characterized in that: The through hole of the pressure strip and the through hole of the inner groove are connected by rivets.

4. The bridge metal expansion joint according to any one of claims 1 to 3, characterized in that: The opening end of the inner groove is provided with abutment bars on both inner walls. The abutment bars are slopes on the adjacent sides, and the slopes gradually slope downwards from the inside to the outside.

5. The bridge metal expansion joint according to claim 4, characterized in that: The upper abutment bar has a protrusion at the slope position; the head of the pressure bar has a recess at the position where it contacts the upper abutment bar, which is adapted to the protrusion of the upper abutment bar; the slope inclination angle of the lower abutment bar is greater than that of the upper abutment bar.

6. The bridge metal expansion joint according to claim 5, characterized in that: The cross-section of the waterstop strip is U-shaped, with obtuse angles on both sides extending outwards and upwards to form pressing edges. The pressing edges extend between the pressing strip and the lower abutment strip, and the pressing strip, the pressing edges, and the lower abutment strip are pressed together in sequence.

7. The bridge metal expansion joint according to claim 6, characterized in that: The outer side of the pressing edge extends downward with an acute angle; the bottom of the inner groove is provided with a hook edge groove, and the hook edge extends into the hook edge groove.

8. The bridge metal expansion joint according to claim 7, characterized in that: The waterstop strip, the pressing edge, and the hook edge are sequentially attached to the outer wall of the profile, the surface of the lower abutment strip, and the inner wall of the hook edge groove.

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