Bridge abutment structure integrated with asphalt concrete impervious panel and construction method thereof

Abstract

The application provides a bridge abutment structure integrated with an asphalt concrete impervious face plate and a construction method thereof, comprising a concrete bridge abutment and a lap joint structure, the concrete bridge abutment is located on the top of a reservoir bank, the concrete bridge abutment comprises an upper groove type structure and a lower base, the upper groove type structure and the lower base are integrally poured to form, the backwater side of the upper groove type structure is connected with the reservoir bank, and an opening is arranged on the water side of the upper groove type structure towards the reservoir, the opening is used for connecting with a traffic bridge, and the left and right side walls of the upper groove type structure along the direction of the traffic bridge are used for connecting with a wave wall; the lap joint structure is arranged on the surface of the lower base and extends to the outside of the lower base, is smoothly connected with an asphalt concrete impervious face plate on the surface of a dam, and forms a continuous impervious body. The application solves the reservoir in-reservoir traffic problem of the whole reservoir basin impervious structure, and guarantees the integrity and continuity of the impervious system.

Description

Technical Field

[0001] This invention relates to the field of reservoir engineering technology for full basin seepage prevention, specifically to a bridge abutment structure and its construction method that are integrated with an asphalt concrete seepage-proof panel. Background Technology

[0002] In reservoir projects where asphalt concrete panels are used as the seepage prevention system throughout the reservoir basin, structures such as gate hoists and intakes are often required to achieve functions such as water intake and flood discharge. These structures are connected to the reservoir bank via traffic bridges. In such projects, the joint treatment between the rigid concrete abutment and the flexible asphalt concrete seepage prevention panel has always been the weakest and most prone to failure part of the seepage prevention system. Existing technologies typically use simple butt joints or simple overlaps. However, due to the significant stiffness difference between the abutment concrete and the reservoir bank fill, unavoidable differential deformation will occur between the two under the influence of reservoir water pressure, temperature changes, and foundation settlement. This deformation concentrates at the joint, which can easily lead to: cracking, peeling, or voiding of the asphalt concrete seepage prevention layer in the joint area due to stress concentration, or fatigue failure under repeated deformation, resulting in leakage.

[0003] Therefore, there is an urgent need in this field for an innovative bridge abutment structure that can ensure the integrity and continuity of the seepage prevention system, effectively coordinate, release or absorb differential deformation between the bridge abutment and the reservoir bank, thereby ensuring the safety and durability of the project in the long term. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the first objective of this invention is to provide a bridge abutment structure that is integrated with an asphalt concrete anti-seepage panel. This invention solves the problem of traffic flow within the reservoir while maintaining the integrity and continuity of the anti-seepage system.

[0005] In a first aspect, the present invention provides a bridge abutment structure integrally connected with an asphalt concrete anti-seepage panel, comprising a concrete bridge abutment and an overlapping structure. The concrete bridge abutment is located on the top of the reservoir bank. The concrete bridge abutment includes an upper trough structure and a lower base, which are integrally cast. The upper trough structure has an opening on its water-facing side facing into the reservoir, which is used to connect with a traffic bridge. The left and right side walls of the upper trough structure along the direction of the traffic bridge are used to connect with a wave wall. The overlapping structure is disposed on the surface of the lower base and extends to the outer side of the lower base, smoothly connecting with the asphalt concrete anti-seepage panel on the dam surface to form a continuous anti-seepage body.

[0006] As a preferred technical solution of the present invention: the upper trough structure includes a bridge trough body configured as a groove and having the opening, the bridge trough body includes a retaining wall and a connecting side wall, the connecting side wall is respectively provided on the left and right sides along the direction of the traffic bridge, the retaining wall and the connecting side wall are provided on the top of the lower base, and together with the lower base, they enclose the traffic bridge connection area.

[0007] As a preferred technical solution of the present invention: the main body of the bridge channel is provided with connecting wing walls on the left and right sides along the direction of the traffic bridge, and is connected to the wave-breaking wall through the connecting wing walls.

[0008] As a preferred embodiment of the present invention, the connecting wing wall is an L-shaped plate structure.

[0009] As a preferred technical solution of the present invention: the lower base is rectangular in planar projection, the overall thickness of the lower base gradually decreases along the inclined surface around the reservoir, and the upper surface, except for the traffic bridge connection area, forms an inclined connecting surface, and the overlapping structure is overlapped on the inclined connecting surface.

[0010] As a preferred technical solution of the present invention: the overlapping structure includes a polyester mesh thickened layer and an asphalt concrete anti-seepage layer that overlap the inclined connecting surface in sequence. The polyester mesh thickened layer and the asphalt concrete anti-seepage layer extend to the outer side of the lower base and are smoothly connected to the asphalt concrete anti-seepage panel on the surface of the dam.

[0011] As a preferred technical solution of the present invention: an asphalt mortar wedge is provided between the inclined connecting surface, the polyester mesh thickening layer, and the asphalt concrete leveling and bonding layer of the asphalt concrete anti-seepage panel.

[0012] As a preferred technical solution of the present invention: copper sheet waterstops are provided between the left and right side walls of the upper trough structure and the wave-breaking wall; a gap is reserved between the overlapping structure and the upper trough structure; the end of the copper sheet waterstop extends into the gap; plastic filler is filled into the gap; and an asphalt mastic sealing layer is provided on the surface of the gap.

[0013] Secondly, a second objective of the present invention is to provide a construction method for a bridge abutment structure integrated with an asphalt concrete anti-seepage panel, comprising the following steps:

[0014] S1. Excavate from the top of the reservoir bank to the design bottom elevation of the reservoir bank's wave wall to form a platform;

[0015] S2. According to the shape of the concrete bridge abutment, continue to excavate to form the bridge abutment foundation trench;

[0016] S3. Concrete bridge abutments are constructed in the bridge abutment foundation trench, and copper sheet waterstops are pre-embedded at the structural joints between the connecting wing walls and the reservoir bank wave protection walls on both sides of the bridge trench main body.

[0017] S4. Construction of overlapping structures, the specific steps are as follows:

[0018] S4.1 Cut off the excess asphalt concrete leveling and bonding layer in the design area around the lower base;

[0019] S4.2. Excavate the drainage cushion layer within the design area into a wedge-shaped groove, and lay an asphalt concrete leveling and bonding layer at the bottom of the wedge-shaped groove;

[0020] S4.3 Fill the wedge-shaped groove with asphalt mortar wedges and lay a polyester mesh thickening layer. The polyester mesh thickening layer is laid on the surface of the asphalt concrete leveling and bonding layer, the asphalt mortar wedges and the lower base. The polyester mesh thickening layer has a pre-reserved gap on the water-facing side of the upper trough structure.

[0021] S4.4. Lay an asphalt concrete anti-seepage layer on the polyester mesh thickened layer to make the asphalt concrete anti-seepage layer smoothly connected to the asphalt concrete anti-seepage panel on the dam surface. The asphalt concrete anti-seepage layer has a pre-reserved gap on the water-facing side of the upper trough structure.

[0022] S5. Extend the exposed end of the copper sheet waterstop to the pre-reserved notch on the water-facing side of the upper trough structure, fill the notch with plastic filler, and apply an asphalt mastic sealing layer to the surface of the notch.

[0023] The beneficial effects provided by this invention are as follows:

[0024] 1. This invention solves the problem of coordinated deformation and reliable water stopping between rigid bridge abutments and flexible asphalt concrete anti-seepage layers, realizing the integrity and continuity of the anti-seepage system, and fundamentally avoiding the difficult problem of joint treatment between permanent structures and the anti-seepage system. Specifically, the lower base adopts an inclined connecting surface and is equipped with an overlapping structure, which can effectively absorb and coordinate the differential deformation between the rigid and flexible structures, preventing panel cracking.

[0025] 2. The integrated connection structure of the present invention avoids the need for transitional connection methods such as adding connecting plates between the traditional rigid structure and the flexible asphalt concrete anti-seepage layer, and eliminates the weak joints formed by the rigidity difference between the traditional bridge abutment and the anti-seepage panel, so that a continuous and complete anti-seepage structure is formed between the rigid bridge abutment and the flexible anti-seepage body, which significantly improves the overall reliability of the anti-seepage system.

[0026] 3. By utilizing the inclined connection surface of the lower base and the flexible transition structures such as the polyester mesh thickened layer and asphalt mortar wedges in the overlapping structure, the differential deformation between the abutment and the reservoir bank fill caused by reservoir water pressure, temperature changes and foundation settlement can be effectively absorbed and coordinated, thus avoiding damage such as cracking, peeling or voiding of the anti-seepage layer in the joint area.

[0027] 4. This technology fills the gap in domestic reservoir transportation challenges caused by asphalt concrete panel seepage prevention, and has positive significance for further promoting the application of asphalt concrete panel seepage prevention structures. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A plan view of the bridge abutment structure provided in an embodiment of the present invention;

[0030] Figure 2 An elevation view of the bridge abutment structure provided in an embodiment of the present invention;

[0031] Figure 3 for Figure 1 A cross-sectional view along the AA direction;

[0032] Figure 4 for Figure 1 A cross-sectional view along the BB direction in the middle;

[0033] Figure 5 for Figure 1 A cross-sectional view along the CC direction in the image;

[0034] Figure 6 for Figure 1 A cross-sectional view along the DD direction in the middle;

[0035] Figure 7 for Figure 1 A cross-sectional view along the EE direction in the middle;

[0036] Figure 8 for Figure 1 A cross-sectional view along the aa direction in the image;

[0037] Figure 9 for Figure 1 A cross-sectional view along the bb direction in the middle;

[0038] Figure 10 for Figure 1 A cross-sectional view along the cc direction in the image;

[0039] Figure 11 for Figure 4 The enlarged view of the part shown in d.

[0040] Reference numerals: 1. Wave wall; 2. Concrete abutment; 3. Asphalt concrete anti-seepage layer; 4. Asphalt concrete leveling and bonding layer; 5. Polyester mesh thickening layer; 6. Drainage cushion layer; 7. Asphalt mortar wedge; 8. Maintenance platform; 9. Reservoir bank pavement structure; 10. Pavement base layer; 11. Copper sheet waterstop; 12. Subbase; 13. Connecting wing wall; 14. Retaining wall; 15. Connecting side wall; 16. Inclined connection surface; 17. Dam asphalt concrete anti-seepage layer; 18. Plastic filler; 19. Asphalt mastic sealing layer. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions of the present invention, preferred embodiments of the present invention are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. For better illustration of this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable that some well-known structures and their descriptions may be omitted in the drawings for those skilled in the art. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting the present invention.

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0043] like Figures 1 to 11 As shown, a bridge abutment structure integrated with an asphalt concrete anti-seepage panel includes a concrete bridge abutment 2 and an overlapping structure. The concrete bridge abutment 2 is located on the top of the reservoir bank. The concrete bridge abutment 2 includes an upper trough structure and a lower base 12, which are integrally cast. The water-facing side of the upper trough structure forms an opening facing into the reservoir, which is used to connect with a traffic bridge. The left and right side walls of the upper trough structure along the direction of the traffic bridge are used to connect with a wave wall 1. The overlapping structure is set on the surface of the lower base 12 and extends to the outside of the lower base 12, smoothly connecting with the asphalt concrete anti-seepage panel on the dam surface to form a continuous anti-seepage body.

[0044] The upper trough structure includes a bridge trough body configured as a groove and having the opening. The groove of the bridge trough body is used to connect with the traffic bridge. The bridge trough body includes a retaining wall 14 and a connecting side wall 15. The connecting side wall 15 is respectively provided on the left and right sides of the retaining wall 14 along the direction of the traffic bridge. The retaining wall 14 and the connecting side wall 15 are located on the top of the lower base 12 and enclose the traffic bridge connection area on the top of the lower base 12.

[0045] The reservoir bank includes a reservoir bank pavement structure 9 and a pavement base course 10. The backwater side of the retaining wall 14 is connected to the reservoir bank pavement structure 9 and the pavement base course 10. The top elevation of the retaining wall 14 is lower than the top elevation of the two connecting side walls 15, and is flush with the top of the reservoir bank pavement structure 9, which is used to form a connecting passage from the reservoir bank pavement to the traffic bridge pavement.

[0046] The main body of the bridge trough is provided with connecting wing walls 13 on the left and right sides along the direction of the traffic bridge, and is connected to the wave-breaking wall 1 through the connecting wing walls 13.

[0047] The connecting wing wall 13 is an L-shaped plate structure, and an inspection platform 8 is provided on the water-facing side of the wave-breaking wall 1.

[0048] The lower base 12 is rectangular in planar projection. The overall thickness of the lower base 12 gradually decreases along the inclined surface around the perimeter of the reservoir. The upper surface, except for the traffic bridge connection area, forms an inclined connection surface 16. The overlapping structure is overlapped on the inclined connection surface 16. In addition, the upper surface of the lower base 12 in the traffic bridge connection area is set as a plane.

[0049] The overlapping structure includes a polyester mesh thickened layer 5 and an asphalt concrete anti-seepage layer 3 that overlap sequentially on the inclined connecting surface 16. The polyester mesh thickened layer 5 and the asphalt concrete anti-seepage layer 3 extend to the outer side of the lower base 12 and are smoothly connected to the asphalt concrete anti-seepage panel on the dam surface.

[0050] The asphalt concrete anti-seepage panel on the surface of the dam includes a drainage cushion layer 6, an asphalt concrete leveling and bonding layer 4, and an asphalt concrete anti-seepage layer 17 laid sequentially on the reservoir bank slope. The asphalt concrete anti-seepage layer 3 and the asphalt concrete anti-seepage layer 17 are connected and transitioned.

[0051] An asphalt mortar wedge 7 is set between the inclined connecting surface 16, the polyester mesh thickened layer 5, and the asphalt concrete leveling and bonding layer 4 of the asphalt concrete anti-seepage panel.

[0052] Copper sheet waterstops 11 are provided between the left and right side walls of the upper trough structure and the wave-breaking wall 1. A gap is reserved between the overlapping structure and the upper trough structure. The end of the copper sheet waterstop 11 extends into the gap. The gap is filled with plastic filler 18. An asphalt mastic sealing layer 19 is provided on the surface of the gap to increase the end seepage prevention capability.

[0053] This invention also provides a construction method for a bridge abutment structure integrated with an asphalt concrete anti-seepage panel. The construction of any of the bridge abutment structures described above includes the following steps:

[0054] S1. Excavate from the top of the reservoir bank to the design bottom elevation of the reservoir bank wave wall 1 to form a platform;

[0055] S2. Following the shape of concrete abutment 2, continue excavating to form the abutment foundation trench;

[0056] Outside the bridge abutment foundation trench, the reservoir bank slope is excavated according to the reservoir bank seepage prevention structure, and a transition section is set up between the reservoir bank slope and the concrete bridge abutment 2. The transition section is typically pre-constructed with a protective layer, followed by meticulous construction using small equipment such as pneumatic picks. Any pits formed by over-excavation in the transition section are backfilled with concrete or high-grade mortar to maintain the precise shape of the connection area. The purpose of setting up the transition section is to ensure the accuracy of the excavated shape, strictly control the deformation value at the connection point, and guarantee the reliability of the connection operation.

[0057] S3. Concrete bridge abutment 2 is constructed in the bridge abutment foundation trench, and copper sheet waterstop 11 is pre-embedded at the structural joint between the connecting wing wall 13 on both sides of the bridge trench and the reservoir bank wave wall 1.

[0058] S4. Construction of overlapping structures, the specific steps are as follows:

[0059] S4.1 Cut off the excess asphalt concrete leveling and bonding layer 4 in the design area around the lower base 12;

[0060] S4.2. Excavate the drainage cushion layer 6 within the design area into a wedge-shaped groove, and lay an asphalt concrete leveling and bonding layer 4 at the bottom of the wedge-shaped groove.

[0061] S4.3 Fill the wedge-shaped groove with asphalt mortar wedge 7 and lay a polyester mesh thickening layer 5. The polyester mesh thickening layer 5 is laid on the surface of the asphalt concrete leveling and bonding layer 4, the asphalt mortar wedge 7 and the lower base 12. The polyester mesh thickening layer 5 has a pre-reserved gap on the water-facing side of the upper trough structure.

[0062] S4.4. Lay an asphalt concrete anti-seepage layer 3 on the polyester mesh thickened layer 5, so that the asphalt concrete anti-seepage layer 3 is smoothly connected to the asphalt concrete anti-seepage panel on the surface of the dam. The asphalt concrete anti-seepage layer 3 has a pre-reserved gap on the water-facing side of the upper trough structure.

[0063] In step S4, most of the overlapping areas can be constructed using mechanized methods, but there are some areas that cannot be reached by machinery. For these areas, manual assistance is used for laying and compaction to level them.

[0064] S5. Extend the exposed end of the copper sheet waterstop 11 into the pre-reserved notch on the water-facing side of the upper groove structure, fill the notch with plastic filler 18, and apply an asphalt mastic sealing layer 19 to the surface of the notch.

[0065] Based on the description and accompanying drawings of this invention, those skilled in the art can easily manufacture or use the bridge abutment structure and its construction method that are integrated with the asphalt concrete anti-seepage panel of this invention, and can achieve the positive effects described in this invention.

[0066] Unless otherwise specified, in this invention, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this invention are for illustrative purposes only and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0067] Unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A bridge abutment structure integrated with an asphalt concrete anti-seepage panel, characterized in that: The structure includes a concrete abutment and an overlapping structure. The concrete abutment is located on the top of the reservoir bank. The concrete abutment includes an upper trough structure and a lower base, which are integrally cast. The upper trough structure has an opening on its water-facing side facing into the reservoir for connecting to a traffic bridge. The left and right side walls of the upper trough structure along the direction of the traffic bridge are used to connect to a wave wall. The overlapping structure is set on the surface of the lower base and extends to the outside of the lower base, smoothly connecting with the asphalt concrete anti-seepage panel on the dam surface to form a continuous anti-seepage body.

2. The bridge abutment structure integrated with the asphalt concrete anti-seepage panel according to claim 1, characterized in that: The upper trough structure includes a bridge trough body configured as a groove and having the opening. The bridge trough body includes a retaining wall and connecting side walls. The connecting side walls are respectively provided on the left and right sides along the direction of the traffic bridge. The retaining wall and the connecting side walls are located on the top of the lower base and enclose the traffic bridge connection area on the top of the lower base.

3. The bridge abutment structure integrated with the asphalt concrete anti-seepage panel according to claim 2, characterized in that: The main body of the bridge trough is provided with connecting wing walls on the left and right sides along the direction of the traffic bridge, and is connected to the wave-breaking wall through the connecting wing walls.

4. The bridge abutment structure integrated with the asphalt concrete anti-seepage panel according to claim 3, characterized in that: The connecting wing wall is an L-shaped plate structure.

5. The bridge abutment structure integrated with the asphalt concrete anti-seepage panel according to claim 2, characterized in that: The lower base is rectangular in planar projection. The overall thickness of the lower base gradually decreases along the inclined surface around the reservoir. The upper surface, except for the traffic bridge connection area, forms an inclined connecting surface. The overlapping structure is overlapped on the inclined connecting surface.

6. The bridge abutment structure integrated with the asphalt concrete anti-seepage panel according to claim 5, characterized in that: The overlapping structure includes a polyester mesh thickened layer and an asphalt concrete anti-seepage layer that overlap the inclined connecting surface in sequence. The polyester mesh thickened layer and the asphalt concrete anti-seepage layer extend to the outer side of the lower base and are smoothly connected to the asphalt concrete anti-seepage panel on the dam surface.

7. The bridge abutment structure integrated with the asphalt concrete anti-seepage panel according to claim 6, characterized in that: An asphalt mortar wedge is set between the inclined connecting surface, the polyester mesh thickened layer, and the asphalt concrete leveling and bonding layer of the asphalt concrete anti-seepage panel.

8. The bridge abutment structure integrated with the asphalt concrete anti-seepage panel according to claim 1, characterized in that: Copper sheet waterstops are installed between the left and right side walls of the upper trough structure and the wave-breaking wall. A gap is reserved between the overlapping structure and the upper trough structure. The end of the copper sheet waterstop extends into the gap. The gap is filled with plastic filler, and an asphalt mastic sealing layer is provided on the surface of the gap.

9. A construction method for a bridge abutment structure integrated with an asphalt concrete anti-seepage panel, characterized in that, The construction of the bridge abutment structure according to any one of claims 1-8 includes the following steps: S1. Excavate from the top of the reservoir bank to the design bottom elevation of the reservoir bank's wave wall to form a platform; S2. According to the shape of the concrete bridge abutment, continue to excavate to form the bridge abutment foundation trench; S3. Concrete bridge abutments are constructed in the bridge abutment foundation trench, and copper sheet waterstops are pre-embedded at the structural joints between the connecting wing walls and the wave-breaking walls on both sides of the bridge trench main body. S4. Construction of overlapping structures, the specific steps are as follows: S4.1 Cut off the excess asphalt concrete leveling and bonding layer in the design area around the lower base; S4.

2. Excavate the drainage cushion layer within the design area into a wedge-shaped groove, and lay an asphalt concrete leveling and bonding layer at the bottom of the wedge-shaped groove; S4.3 Fill the wedge-shaped groove with asphalt mortar wedges and lay a polyester mesh thickening layer. The polyester mesh thickening layer is laid on the surface of the asphalt concrete leveling and bonding layer, the asphalt mortar wedges and the lower base. The polyester mesh thickening layer has a pre-reserved gap on the water-facing side of the upper trough structure. S4.

4. Lay an asphalt concrete anti-seepage layer on the polyester mesh thickened layer to make the asphalt concrete anti-seepage layer smoothly connected to the asphalt concrete anti-seepage panel on the dam surface. The asphalt concrete anti-seepage layer has a pre-reserved gap on the water-facing side of the upper trough structure. S5. Extend the exposed end of the copper sheet waterstop to the pre-reserved notch on the water-facing side of the upper trough structure, fill the notch with plastic filler, and apply an asphalt mastic sealing layer to the surface of the notch.

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