Multistage buffering hidden type bridge expansion device and construction method thereof

Abstract

The invention discloses a multi-stage buffering hidden type bridge expansion device and a construction method thereof, and belongs to the technical field of bridge engineering, the multi-stage buffering hidden type bridge expansion device comprises a bearing mechanism, a transverse guide rod arranged in a mounting groove of the bearing mechanism, and a plurality of load stress decomposition metal blocks arranged on the transverse guide rod in a sleeving manner; the bearing mechanism comprises an upper-layer steel plate and a lower-layer steel plate, one end of the transverse guide rod and the side wall of the upper-layer steel plate are arranged into a whole, and the mounting groove is located in the lower-layer steel plate; a flexible sealing strip is arranged between every two adjacent load stress decomposition metal blocks. The construction method of the multi-stage buffering hidden type bridge expansion device comprises the steps of foundation bolt pre-embedding, back wall and / or beam body base acceptance inspection, back wall and / or beam body bed mortar layer construction, multi-stage buffering hidden type bridge expansion device installation, final tightening of foundation bolts, acceptance inspection monitoring and asphalt layer paving. According to the scheme, deformation is small, concealed installation can be achieved, the later maintenance cost is reduced, and the device can adapt to complex working conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and provides a multi-stage buffer hidden bridge expansion device with small deformation, concealed installation, reduced later maintenance cost and adaptability to complex working conditions, and a construction method thereof. Background Art

[0002] There are five types of expansion joint structures widely used in bridge expansion devices, namely seamless expansion joints, butt-type expansion joints, rubber plate expansion joints, steel-supported expansion joints (the comb tooth type is widely used), and modular expansion joints.

[0003] The structural principles of the three types of expansion joints, seamless expansion joints, butt-jointed expansion joints, and rubber plate expansion joints, are roughly the same, that is, the strength of the elastic-plastic material is used as the support of the bridge gap, and the large shear deformation of the material is used to offset the expansion and contraction deformation of the bridge. However, the load capacity of elastic-plastic materials is limited, and the shear deformation capacity is also limited, so they can only be used for small and medium-sized bridges with low load levels. Due to the growing transportation needs in my country, they are now gradually being eliminated.

[0004] At present, the main bridge construction process uses joint expansion structure, which is basically steel support expansion joint (such as Figure 1 as shown) and modular expansion joints (as Figure 2 The structural principles of these two expansion joints are roughly the same, that is, leaving a gap in the bridge and using steel plates to protect the edge of the bridge, and using the gaps between the steel plates to meet the deformation requirements of the bridge. Although it can be deformed greatly and carry heavy loads during use, the steel is laid on the road surface, and impact vibration occurs when vehicles pass through, affecting the driving smoothness; sometimes sand and gravel enter between the steel plates, affecting the expansion and contraction of the bridge and damaging the expansion joint, resulting in insufficient durability; the sealing material is prone to aging, and the mechanical parts are prone to jamming, requiring frequent maintenance; the structure is exposed, and the device is exposed to the bridge deck, affecting the appearance of the bridge and making it difficult to seamlessly connect with the pavement layer. In specific use, it is easy to change when subjected to vehicle loads. Steel-supported expansion joints often have abnormal contraction joint activity, damage to anchors, fracture or warping of tooth plates, severe vibration, loud driving noise, and severe water leakage; in severe cases, it affects driving safety. Modular expansion joints have fractures in section steel and cracking and crushing of anchor concrete, and differences in the installation elevations of expansion joints lead to vehicle jumping at the expansion joints.

[0005] In summary, the existing bridge expansion devices all compensate for the expansion and contraction amount once, resulting in insufficient compensation expansion and contraction amount for closed expansion joints, insufficient comfort of slotted expansion joints, high subsequent maintenance costs, inability to adapt to complex working conditions or can only be installed in the exposed state. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a multi-stage buffer hidden bridge expansion device and a construction method thereof with small deformation, concealed installation, reduced later maintenance costs and adaptability to complex working conditions, aiming to solve the technical problem that the existing tunnel drainage pipe tooling cannot guarantee the installation quality of the transverse drainage pipe.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a multi-stage buffer hidden bridge expansion device, which includes: a bearing mechanism, a transverse guide rod arranged in a mounting groove of the bearing mechanism, and a plurality of load stress decomposition metal blocks sleeved on the transverse guide rod, wherein the bottom plate surface of the load stress decomposition metal block is closely attached to the bottom plate surface of the mounting groove of the bearing mechanism;

[0009] The bearing mechanism comprises an upper steel plate and a lower steel plate, the upper steel plate is slidably connected to the lower steel plate, one end of the transverse guide rod is integrally formed with the side wall of the upper steel plate, and the mounting groove is located on the lower steel plate;

[0010] A flexible sealing strip is arranged between two adjacent load stress decomposition metal blocks.

[0011] In the above scheme, further: the transverse cross-section of the load stress decomposition metal block and the transverse cross-section of the flexible sealing strip are both trapezoidal.

[0012] In the above solution, further: the flexible sealing strip is made of fluororubber material.

[0013] In the above scheme, further: a PTFE coating is provided on the bottom plate surface of the upper steel plate and the top plate surface of the lower steel plate.

[0014] In the above scheme, further: a bite structure that bites each other is provided at the connection surface between the upper steel plate and the lower steel plate.

[0015] In the above scheme, further: the biting structure includes biting teeth and biting grooves, the biting teeth are located on the bottom plate surface of the upper steel plate, and the biting groove is located on the left side wall of the groove body of the lower steel plate.

[0016] In the above scheme, further: a telescopic slot hole is provided on the right side wall of the slot body of the lower steel plate, the shape of the telescopic slot hole is the same as the shape of the transverse guide rod, and a telescopic margin is left.

[0017] In the above solution, further: the longitudinal cross-section of the transverse guide rod is in the shape of a rectangle.

[0018] In the above scheme, further: an asphalt layer is provided on the top plate surface of the supporting mechanism.

[0019] The present invention also provides a construction method of a multi-stage buffer hidden bridge expansion device, comprising the following steps:

[0020] 1. Pre-embedded anchor bolts,

[0021] Pre-embed anchor bolts during beam prefabrication or back wall construction;

[0022] 2. Acceptance of back wall and / or beam base,

[0023] Check the concrete strength of the back wall and / or beam base, and then check the position of the anchor bolts; after checking the position of the anchor bolts, mill holes on the bearing mechanism, clean the base surface of the back wall and / or beam, and roughen it to enhance the bonding strength of the mortar layer on the base surface of the back wall and / or beam;

[0024] 3. Construction of the mortar layer of the back wall and / or beam body.

[0025] Add water to the grouting material according to the manufacturer's ratio, mix evenly and apply it on the base surface of the back wall and / or beam body;

[0026] 4. Installation of multi-stage buffer hidden bridge expansion device,

[0027] Install the multi-stage buffer hidden bridge expansion device to the mortar layer of the back wall and / or beam body, gently press to adjust the level, use a thin steel sheet to adjust the level in time, and ensure that the mortar always fills the gap; finally, initially tighten the anchor bolts;

[0028] 5. Finally tighten the anchor bolts.

[0029] Use the symmetrical tightening method to reach the designed torque value in 2-3 times; check the bolt preload force, the deviation is ≤±5%;

[0030] 6. Acceptance monitoring,

[0031] After the grouting material is finally set, check the flatness of the multi-stage buffer hidden bridge expansion device and whether it shakes; if it does not meet the design requirements, dismantle the multi-stage buffer hidden bridge expansion device, remove all grouting materials, clean the surface again, and repeat steps 4 to 6;

[0032] 7. Asphalt layer paving,

[0033] The asphalt layer is laid according to conventional techniques.

[0034] The beneficial effects of the present invention are:

[0035] (1) The vehicle passes smoothly and continuously, eliminating the deformation problem of traditional devices, significantly reducing vehicle impact vibration, and small deformation;

[0036] (2) Long-life design, through multi-level buffer and high-rigidity paving board to reduce component fatigue damage, extend the overall service life, and can adapt to complex working conditions;

[0037] (3) Fully concealed structure, seamlessly connected with the bridge deck pavement, improving the bridge's aesthetics and driving comfort, and can be concealedly installed;

[0038] (4) Reduce the maintenance cost of the entire life cycle, extend the overhaul interval, and reduce the subsequent maintenance cost;

[0039] (5) Reduce the risk of traffic accidents and traffic control losses caused by damage to expansion joints.

[0040] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0042] Figure 1 It is a structural schematic diagram when the existing steel support expansion joint structure is used;

[0043] Figure 2 It is a structural schematic diagram of the existing modular expansion joint structure when used;

[0044] Figure 3 It is a structural schematic diagram of the explosion state of the present invention;

[0045] Figure 4 It is a three-dimensional structural schematic diagram of the present invention in use;

[0046] Figure 5 It is a schematic diagram of the structure of the present invention when it is in use, viewed from the side;

[0047] Figure numerals: 1. bearing mechanism; 2. mounting groove; 3. transverse guide rod; 4. load stress decomposition metal block; 5. flexible sealing strip; 6. PTFE coating; 7. bite structure; 8. telescopic slot hole; 9. back wall; 10. beam body; 11. asphalt layer; 12. hollow inner cavity; 13. secondary sealing strip; 101. upper steel plate; 102. lower steel plate; 701. bite teeth; 702. bite groove. DETAILED DESCRIPTION

[0048] The present invention is further described below in conjunction with specific implementation methods. Among them, the accompanying drawings are only used for exemplary descriptions, and only schematic diagrams are shown, not physical diagrams, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. The illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. In the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0049] In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0050] like Figures 3 to 5 As shown, the multi-stage buffer hidden bridge expansion device mentioned in the present invention includes: a bearing mechanism 1, a transverse guide rod 3 arranged in the mounting groove 2 of the bearing mechanism 1, and a plurality of load stress decomposition metal blocks 4 sleeved on the transverse guide rod 3, wherein the bottom plate surface of the load stress decomposition metal block 4 is closely attached to the bottom plate surface of the mounting groove 2 of the bearing mechanism 1;

[0051] The bearing mechanism 1 includes an upper steel plate 101 and a lower steel plate 102, wherein the upper steel plate 101 is slidably connected to the lower steel plate 102, one end of the transverse guide rod 3 is integrally formed with the side wall of the upper steel plate 101, and the mounting groove 2 is located on the lower steel plate 102;

[0052] A flexible sealing strip 5 is provided between two adjacent load stress decomposition metal blocks 4. In this embodiment, the number of load stress decomposition metal blocks 4 is determined according to the calculated displacement of the bridge. (Δmax is the designed expansion and contraction amount, n is the number of the load stress decomposition metal blocks 4), S is the spacing at 1 / 2 of the height of the load stress decomposition metal blocks 4, 60mm≥S≥40mm.

[0053] The displacement decomposition mechanism of the device is to discretize the overall expansion and contraction through an array of 4 constant load stress decomposition metal blocks, and each level of buffer unit (each load stress decomposition metal block 4) independently bears part of the displacement to reduce local stress concentration.

[0054] When the expansion joint of the bridge shrinks by Lmm, the upper steel plate 101 of the bearing mechanism 1 is subjected to the tensile load stress decomposition metal block 4 which slides toward the fixed end, and the distance between adjacent metal blocks is reduced by (L / n)mm; the trapezoidal flexible sealing strip 5 elastically opens, and the width increases from Smm to S+(L / n)mm to maintain the sealing continuity.

[0055] When the expansion joint of the bridge expands by Lmm, the upper steel plate 101 of the bearing structure 1 is compressed, pushing the load stress decomposition metal block 4 to slide toward the movable end, and the adjacent spacing increases by (L / n)mm; the trapezoidal flexible sealing strip 5 is compressed and contracted, and the width decreases from Smm to S-(L / n)mm, always filling the gap.

[0056] To ensure that the flexible sealing strip 5 does not fall out of the gap between two adjacent load stress decomposition metal blocks 4 when the entire structure is subjected to dynamic loads and temperature changes. In the above embodiment, preferably, the transverse cross-sections of the load stress decomposition metal block 4 and the flexible sealing strip 5 are both trapezoidal.

[0057] In order to ensure that the flexible sealing strip 5 is not damaged during the subsequent high-temperature construction of asphalt paving, in the above embodiment, preferably: the flexible sealing strip 5 is made of fluororubber material. The chemical stability and high temperature resistance of fluororubber material can ensure the construction performance and durability of the entire structure, and the high elasticity can ensure that the gap is always filled. In this embodiment, the middle part of the flexible sealing strip 5 has a hollow inner cavity 12, and the shape of the longitudinal cross-section of the hollow inner cavity 12 is the same as the shape of the longitudinal cross-section of the transverse guide rod 3. The size of the hollow inner cavity 12 is larger than the size of the transverse guide rod 3. A secondary sealing strip 13 supported by fluororubber material is arranged between the hollow inner cavity 12 and the side wall of the transverse guide rod 3. Through this arrangement, it can be ensured that the entire structure causes the transverse guide rod 3 to have axial displacement when subjected to dynamic loads.

[0058] In order to extend the service life and reduce the interlayer friction resistance, in the above embodiment, preferably: the bottom plate surface of the upper steel plate 101 and the top plate surface of the lower steel plate 102 are both provided with a PTFE coating 6.

[0059] In order to ensure that the top surface of the entire device is completely sealed, in the above embodiment, preferably: a mutually interlocking bite structure 7 is provided at the connecting surface between the upper steel plate 101 and the lower steel plate 102 .

[0060] In order to prevent the entire structure from falling out or warping under impact load, in the above embodiment, preferably: the bite structure 7 includes bite teeth 701 and bite grooves 702, the bite teeth 701 are located on the bottom plate surface of the upper steel plate 101, and the bite groove 702 is located on the left side wall of the groove body of the lower steel plate 102.

[0061] To effectively ensure that the transverse guide rod 3 can be freely extended and retracted, in the above embodiment, preferably: a telescopic slot hole 8 is provided on the right side wall of the slot body of the lower steel plate 102, and the shape of the telescopic slot hole 8 is the same as that of the transverse guide rod 3, and a telescopic margin is left.

[0062] In order to effectively limit the displacement of the load stress decomposition metal block 4, in the above embodiment, preferably: the longitudinal cross-section of the transverse guide rod 3 is in the shape of a rectangle. The rectangle can better limit the displacement of the decomposition metal block 4.

[0063] In order to further extend the service life of the structure and improve driving comfort, in the above embodiment, preferably: an asphalt layer 11 is provided on the top plate surface of the supporting mechanism 1.

[0064] In the above embodiments, all components are commercially available products.

[0065] The construction method of the multi-stage buffer hidden bridge expansion device in the above embodiment includes the following steps:

[0066] 1. Pre-embedded anchor bolts,

[0067] The anchor bolts are embedded in advance during the prefabrication of the beam or the construction of the back wall; in the specific implementation, the anchor bolts use 8.8 grade hot-dip galvanized bolts and matching nuts.

[0068] 2. Acceptance of back wall and / or beam base,

[0069] Check the concrete strength of the back wall 9 and / or beam 10 base, which must reach 100% of the design strength. Then check the position of the anchor bolts to avoid inaccurate embedded position during prefabrication and erection of the beam 10. After checking the position of the anchor bolts, mill holes on the bearing mechanism of the multi-stage buffer hidden bridge expansion device, clean the base surface of the back wall 9 and / or beam 10, and roughen it to enhance the bonding strength of the mortar layer on the base surface of the back wall 9 and / or beam 10;

[0070] 3. Construction of the mortar layer of the back wall 9 and / or beam body 10,

[0071] The grouting material is mixed with water according to the manufacturer's ratio, evenly applied to the base surface of the back wall 9 and / or the beam body 10, and the thickness is preferably 5 mm.

[0072] 4. Installation of multi-stage buffer hidden bridge expansion device,

[0073] Install the multi-stage buffer hidden bridge expansion device to the mortar layer of the back wall 9 and / or the beam body 10, gently press to adjust the level (≤0.1mm / m), use a thin steel sheet to adjust the level in time, and ensure that the mortar always fills the gap; finally, initially tighten the anchor bolts;

[0074] 5. Finally tighten the anchor bolts.

[0075] Use the symmetrical tightening method to reach the designed torque value in 2-3 times; check the bolt preload force, the deviation is ≤±5%.

[0076] 6. Acceptance monitoring,

[0077] After the grouting material is finally set, check the flatness of the multi-stage buffer hidden bridge expansion device and whether it shakes; if it does not meet the design requirements, dismantle the multi-stage buffer hidden bridge expansion device, remove all grouting materials, clean the surface again, and repeat steps 4 to 6;

[0078] 7. Asphalt layer 11 paving,

[0079] The asphalt layer 11 is paved and constructed according to conventional techniques.

[0080] During the above construction process, conventional construction methods will be adopted for construction methods not clearly stated.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A multi-stage buffer hidden bridge expansion device, characterized in that: It comprises a bearing mechanism (1), a transverse guide rod (3) arranged in a mounting groove (2) of the bearing mechanism (1), and a plurality of load stress decomposition metal blocks (4) sleeved on the transverse guide rod (3), wherein the bottom plate surface of the load stress decomposition metal block (4) is closely attached to the bottom plate surface of the mounting groove (2) of the bearing mechanism (1); The bearing mechanism (1) comprises an upper steel plate (101) and a lower steel plate (102), wherein the upper steel plate (101) is slidably connected to the lower steel plate (102), one end of the transverse guide rod (3) is integrally formed with the side wall of the upper steel plate (101), and the mounting groove (2) is located on the lower steel plate (102); A flexible sealing strip (5) is provided between two adjacent load stress decomposition metal blocks (4).

2. The multi-stage buffer hidden bridge expansion device according to claim 1 is characterized in that: The transverse cross-section of the load stress decomposition metal block (4) and the transverse cross-section of the flexible sealing strip (5) are both trapezoidal.

3. The multi-stage buffer hidden bridge expansion device according to claim 2 is characterized in that: The flexible sealing strip (5) is made of fluororubber material.

4. The multi-stage buffer hidden bridge expansion device according to claim 1 is characterized in that: The bottom plate surface of the upper steel plate (101) and the top plate surface of the lower steel plate (102) are both provided with a PTFE coating (6).

5. The multi-stage buffer hidden bridge expansion device according to claim 4 is characterized in that: A mutually interlocking interlocking structure (7) is provided at the connection surface between the upper steel plate (101) and the lower steel plate (102).

6. The multi-stage buffer hidden bridge expansion device according to claim 5 is characterized in that: The engaging structure (7) comprises an engaging tooth (701) and an engaging groove (702), wherein the engaging tooth (701) is located on the bottom plate surface of the upper steel plate (101), and the engaging groove (702) is located on the left side wall of the groove body of the lower steel plate (102).

7. The multi-stage buffer hidden bridge expansion device according to claim 6 is characterized in that: A telescopic slot hole (8) is provided on the right side wall of the slot body of the lower steel plate (102). The shape of the telescopic slot hole (8) is the same as that of the transverse guide rod (3), and a telescopic margin is left.

8. The multi-stage buffer hidden bridge expansion device according to claim 7 is characterized in that: The longitudinal cross-section of the transverse guide rod (3) is in the shape of a rectangle.

9. The multi-stage buffer hidden bridge expansion device according to claim 1 is characterized in that: An asphalt layer (11) is provided on the top plate surface of the supporting mechanism (1).

10. The construction method of the multi-stage buffer hidden bridge expansion device according to claims 1 to 9, characterized in that; The steps include:

1. Pre-embedded anchor bolts, Pre-embed anchor bolts during beam prefabrication or back wall construction; 2. Acceptance of back wall and / or beam base, Check the strength and flatness of the concrete base of the back wall (9) and / or the beam body (10), and then check the position of the anchor bolts; mill holes on the bearing mechanism (1) according to the position of the anchor bolts, clean the base surface of the back wall (9) and / or the beam body (10), and roughen it to enhance the bonding force of the mortar layer on the base surface of the back wall (9) and / or the beam body (10); 3. Construction of the mortar layer of the back wall (9) and / or beam body (10). The grouting material is mixed with water according to the manufacturer's ratio and evenly applied to the base surface of the back wall (9) and / or the beam body (10), preferably with a thickness of 5 mm.

4. Installation of multi-stage buffer hidden bridge expansion device, The multi-stage buffer hidden bridge expansion device is installed on the mortar layer of the back wall (9) and / or the beam body (10), and the horizontality is adjusted by light pressure. The horizontality is adjusted in time with a thin steel sheet, and the mortar is ensured to always fill the gap; finally, the anchor bolts are initially tightened; 5. Finally tighten the anchor bolts. Use the symmetrical tightening method to reach the designed torque value in 2-3 times; check the bolt preload force, the deviation is ≤±5%.

6. Acceptance monitoring, After the grouting material is finally set, check the flatness of the multi-stage buffer hidden bridge expansion device and whether it shakes; if it does not meet the design requirements, dismantle the multi-stage buffer hidden bridge expansion device, remove all grouting materials, clean the surface again, and repeat steps 4 to 6; 7. Asphalt layer (11) paving, The asphalt layer (11) is paved and constructed according to conventional techniques.

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