Asphalt concrete panel structure of dam with integrated anti-seepage and slope consolidation and construction method

Abstract

The present invention discloses an asphalt concrete panel structure and construction method for a dam with integrated anti-seepage and slope consolidation, comprising several layers of leveling cementing walls, the leveling cementing walls being a trapezoid with a narrow upper bottom and a wide lower bottom, the lower bottoms of several layers of leveling cementing walls being built on the upper bottoms of the lower leveling cementing walls to form a multi-layered stepped structure, the water-facing surfaces of several layers of leveling cementing walls being all on the same slope to form a flat slope surface, the asphalt concrete anti-seepage layer and the asphalt mastic sealing layer being laid on the slope surface in sequence, and the dam body filling material being behind the leveling cementing wall. The present invention integrates anti-seepage and slope consolidation, not only meeting the slope protection function of the dam, but also taking into account and improving the functions of the traditional leveling cementing layer foundation leveling and ensuring the stability and integrity of the upper structure, realizing the horizontal plane construction of the leveling cementing wall, simplifying the construction process while improving the asphalt panel structure, saving construction period, and solving the potential safety hazards and slow progress of the slope paving and rolling process of the leveling cementing layer.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and specifically relates to an anti-seepage and slope-fixing integrated dam asphalt concrete panel structure and a construction method. Background Art

[0002] Asphalt concrete panels have good anti-seepage capabilities, excellent adaptability to foundation deformation and temperature deformation, and do not require structural joints, making them very suitable for use as anti-seepage bodies for reservoir dams. Their structure mainly includes asphalt concrete leveling bonding layer, asphalt concrete anti-seepage layer, and sealing layer.

[0003] The existing technology dam slope consolidation and asphalt concrete panel construction methods mainly include: 1. Overfilling and slope cutting, such as Figure 2 As shown, the overfilled dam slope is trimmed and compacted with a vibrating roller. After the compaction is qualified, the slope is protected by rolling cement mortar or sprayed concrete, emulsified asphalt, and then the asphalt concrete is laid and rolled on the dam slope to level the bonding layer and the asphalt concrete anti-seepage layer, and finally the sealing layer is constructed. This method requires the entire dam to be filled before the dam slope can be fixed and the asphalt concrete anti-seepage panel can be constructed. 2. Figure 3 As shown, for the flip-form mortar slope consolidation, the formwork is installed first, and then the dam material behind the formwork is filled and rolled. The dam material below the formwork needs to be manually backfilled and fed to prevent overhead and rolling; the wedge is pulled out and the mortar is poured to ensure that the mortar is full, and the dam material behind the formwork is finally rolled before the mortar begins to set. The formwork is flipped over to carry out the next layer of dam material filling and mortar slope consolidation construction. After the entire dam is filled, the asphalt concrete leveling bonding layer and the asphalt concrete anti-seepage layer are paved and rolled on the surface of the mortar slope consolidation, and finally the sealing layer is constructed. This method is to carry out layered slope consolidation, and the asphalt concrete anti-seepage panel is constructed after the entire dam is filled and the slope consolidation is completed. 3. Figure 4 As shown, the extruded side wall slope consolidation first uses an extruder to construct the extruded side wall. After the extruded side wall reaches a certain strength, the dam material behind the extruded side wall is filled and rolled. After the rolling is completed, the next layer of extruded side wall and dam filling construction are carried out. After the entire dam is filled, the asphalt concrete leveling bonding layer and asphalt concrete anti-seepage layer are paved and rolled on the outer surface of the extruded side wall, and finally the sealing layer is constructed. This method also performs layered slope consolidation, and after the entire dam is filled and slope consolidation is completed, the asphalt concrete anti-seepage panel is constructed.

[0004] The above-mentioned Plan 1 has a large amount of work, low construction efficiency, and difficult to ensure quality. There are also problems such as slope construction and cross-operation risks. The construction of the dam slope and asphalt concrete panel cannot be carried out until the entire dam is filled. The above-mentioned Plans 2 and 3 are more efficient than Plan 1, but the paving and rolling of the asphalt concrete panel anti-seepage structure still need to wait until the entire dam is filled before they can be carried out. In addition, the slope construction technology requirements are high and the construction difficulty is great. Paving and rolling are relatively difficult and the safety is low. The risks of slope construction should be minimized, the construction process should be simplified, the efficiency should be improved, the investment should be saved, and the construction period should be shortened. Summary of the invention

[0005] The purpose of the present invention is to provide an asphalt concrete panel structure and construction method for a dam with integrated anti-seepage and slope consolidation, which integrates anti-seepage and slope consolidation, and can achieve horizontal surface construction of leveling bonding walls during slope consolidation construction, thereby simplifying the construction process while improving the structure.

[0006] The objective of the present invention is achieved through the following technical means: an asphalt concrete panel structure for a dam with integrated anti-seepage and slope consolidation, comprising several layers of leveling bonding walls, the leveling bonding walls being a trapezoid with a narrow upper bottom and a wide lower bottom, the lower bottoms of several layers of leveling bonding walls being built on the upper bottoms of the lower leveling bonding walls to form a multi-layer stepped structure, the water-facing surfaces of several layers of leveling bonding walls being all on the same slope to form a flat slope surface, an asphalt concrete anti-seepage layer and an asphalt mastic sealing layer being sequentially laid on the slope surface, and the dam body filling material being behind the leveling bonding walls.

[0007] The height h of the leveled cementing wall is consistent with the compacted thickness of the dam body filling material, and the slope of the water-facing surface is consistent with the upstream design slope of the dam body, which is 1:n.

[0008] The upper bottom width a of the leveled cemented wall is ≥ , d is the minimum thickness of the asphalt concrete anti-seepage layer required by the design; the slope ratio of the back water surface of the leveled bonding wall is i=6:1~9:1.

[0009] The leveling bonding wall is asphalt concrete.

[0010] The leveled cementitious wall is formed by extrusion construction using an extruder.

[0011] A construction method for an anti-seepage and slope-fixing integrated dam asphalt concrete panel structure comprises the following steps:

[0012] After the leveling bonding wall is formed by extrusion, the dam body is filled behind the leveling bonding wall so that the top of the dam body filling material is flush with the top of the leveling bonding wall to form a plane;

[0013] On the plane formed by the leveling bonding wall and the dam body filling material below, a new layer of leveling bonding wall is extruded to ensure that the water-facing surfaces of the upper and lower leveling bonding walls form a flat slope surface, and dam materials are filled at the rear. Repeat the above steps until the leveling bonding wall is constructed to the dam top;

[0014] Finally, on the slope surface of the water-facing side of several leveled cemented walls, an asphalt concrete anti-seepage layer is first laid from the bottom to the top of the dam, and then an asphalt mastic sealing layer is laid.

[0015] The beneficial effects of the present invention are:

[0016] The leveling bonding layer in the asphalt concrete anti-seepage panel is improved into a leveling bonding wall, which not only meets the slope protection function of the dam, but also takes into account and improves the basic leveling of the traditional leveling bonding layer and the function of ensuring the stability and integrity of the upper structure; the anti-seepage and slope consolidation are integrated, and the horizontal surface construction of the leveling bonding wall can be achieved during the slope consolidation construction, and the construction process can be simplified while the asphalt panel structure is improved;

[0017] Solve the potential safety hazards, slow progress, small construction site, long construction period and other problems in the leveling and paving and rolling process of the cementing layer slope; improve construction efficiency, save construction time, be safe and reliable, and reduce project costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of the asphalt concrete panel structure of the dam with integrated anti-seepage and slope consolidation for this application;

[0019] Figure 2 This is a cross-sectional view of the asphalt concrete panel structure of the existing dam (overfill and slope cutting);

[0020] Figure 3 This is a cross-sectional view of the asphalt concrete panel structure of the existing dam (slope consolidation with overmolding mortar);

[0021] Figure 4 This is a cross-sectional view of the asphalt concrete panel structure of the existing dam (extruded side wall to stabilize the slope);

[0022] In the figure, 1 is the leveling cementing wall; 2 is the asphalt concrete anti-seepage layer; 3 is the asphalt mastic sealing layer;

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0024] [Example 1]

[0025] like Figure 1As shown, an asphalt concrete panel structure of a dam with integrated anti-seepage and slope consolidation includes several layers of leveling and bonding walls 1. The leveling and bonding walls 1 are trapezoidal with a narrow upper bottom and a wide lower bottom. The lower bottoms of several layers of leveling and bonding walls 1 are built on the upper bottoms of the lower leveling and bonding walls 1 to form a multi-layer stepped structure. The water-facing surfaces of several layers of leveling and bonding walls 1 are all on the same slope to form a flat slope surface. An asphalt concrete anti-seepage layer 2 and an asphalt mastic sealing layer 3 are laid on the slope surface in sequence. The back of the leveling and bonding wall 1 is the dam body filling material.

[0026] The height h of the leveled cementing wall 1 is consistent with the compacted thickness of the dam body filling material, and the slope of the water-facing surface is consistent with the upstream design slope of the dam body, which is 1:n.

[0027] The upper bottom width a of the leveled cement wall 1 is ≥ , d is the minimum thickness of the asphalt concrete anti-seepage layer required by the design; the slope ratio of the back water surface of the leveling bonding wall 1 is i=6:1~9:1.

[0028] The leveling cementing wall 1 is asphalt concrete, with a maximum aggregate size of no more than 19 mm, an asphalt content of 3.5% to 5.0%, a porosity of 10 to 15%, a thermal stability coefficient of ≤4.5, and a water stability coefficient of ≥0.85.

[0029] The leveled cementitious wall 1 is formed by extrusion construction using an extruder.

[0030] like Figure 1 As shown, the leveling bonding wall 1 is made of concrete asphalt like the leveling bonding layer in the prior art, and can be formed by extrusion using an extruder.

[0031] The cross-section of each leveled bonded wall 1 is a trapezoid of the same size, with a narrow upper base and a wide lower base.

[0032] like Figure 1 As shown, the second layer of the leveling cemented wall 1 is built on the plane formed by the upper bottom of the first layer of the leveling cemented wall 1 and the backfill material of the dam body. The left side of the lower bottom of the second layer of the leveling cemented wall 1 is aligned with the left side of the upper bottom of the first layer of the leveling cemented wall 1. The water-facing surfaces of several layers of the leveling cemented wall 1 are all on the same slope, forming a flat slope surface. The slope of the slope is consistent with the upstream design slope of the dam body, which is 1:n, and n is the design value.

[0033] The upper bottom width of the leveling cement wall 1 is a≥ , is to ensure that the vertical thickness from the water-facing surface of the leveling adhesive wall 1 to the other side of the leveling adhesive wall 1 is always greater than the designed safety thickness, such as Figure 1 As shown, the vertical distance from the right end of the upper bottom of the leveling junction wall 1 to the water-facing surface is the minimum thickness of the leveling adhesive wall 1, so it is necessary to ensure that the upper bottom width a is greater than a certain value.

[0034] On the flat slope surface formed by several layers of leveled cemented walls 1, an asphalt concrete anti-seepage layer 2 is first laid, and then an asphalt mastic sealing layer 3 is laid on the asphalt concrete anti-seepage layer 2.

[0035] A construction method for an anti-seepage and slope-fixing integrated dam asphalt concrete panel structure comprises the following steps:

[0036] After the leveling cementing wall 1 is formed by extrusion construction, the dam body is filled behind the leveling cementing wall 1 so that the top of the dam body filling material is flush with the top of the leveling cementing wall 1 to form a plane;

[0037] On the plane formed by the lower leveling cementing wall 1 and the dam body filling material, a new layer of leveling cementing wall 1 is extruded to ensure that the water-facing surfaces of the upper and lower leveling cementing walls 1 form a flat slope surface, and dam materials are filled at the rear, and the above steps are repeated until the leveling cementing wall 1 is constructed to the dam top;

[0038] Finally, on the slope surface of the water-facing surface of the several-layer leveled cementing wall 1, an asphalt concrete anti-seepage layer 2 is first laid from the bottom to the top of the dam, and then an asphalt mastic sealing layer 3 is laid.

[0039] First, the first layer of the leveling cementing wall 1 is extruded and formed by an extruder, and then behind the leveling cementing wall 1, Figure 1 The dam material is filled on the middle right side until the dam material reaches the upper bottom height of the leveling cementing wall 1, and the leveling cementing wall 1 and the top of the dam material form a flat plane.

[0040] Repeat the leveling of the bonding wall 1 and the dam material construction on the new level plane until the dam top elevation is reached.

[0041] Several layers of leveling cement wall 1 form a slope surface, which is the same as the upstream design slope of the dam body, both of which are 1:n, that is, the ratio of the vertical height of the slope to the horizontal distance; the upper bottom width a of the leveling cement wall 1 is ≥ , d is the minimum thickness of the asphalt concrete anti-seepage layer required by the design; the slope ratio of the back water surface of the leveling bonding wall 1 is i=6:1~9:1.

[0042] Compared with the existing anti-seepage structure, the anti-seepage and slope consolidation are integrated, the asphalt concrete panel structure is improved, and the construction time and construction materials are saved. The new leveling bonding wall 1 not only meets the slope protection function of the dam, but also takes into account and improves the function of leveling the foundation of the traditional leveling bonding layer and ensuring the stability and integrity of the upper structure.

[0043] In addition, the existing structural construction is to first carry out the dam slope protection, and then spread and roll the leveling binder layer on the slope protection surface after the entire dam is filled. There is a risk of slope construction, and it is time-consuming and slow. This solution can realize the horizontal surface construction of the leveling binder wall while consolidating the slope, and can simplify the construction process while improving the asphalt panel structure; solve the slope paving and rolling problems of the leveling binder layer, improve construction efficiency, save construction time, be safe and reliable, and have a low project cost.

Claims

1. An anti-seepage and slope consolidation integrated dam asphalt concrete panel structure, characterized in that: The invention comprises a plurality of leveling adhesive walls (1), wherein the leveling adhesive walls (1) are in the shape of a trapezoid with a narrow upper bottom and a wide lower bottom. The lower bottoms of the plurality of leveling adhesive walls (1) are stacked on the upper bottoms of the lower leveling adhesive walls (1) to form a multi-layer stepped structure. The water-facing surfaces of the plurality of leveling adhesive walls (1) are all on the same slope to form a flat slope surface. An asphalt concrete anti-seepage layer (2) and an asphalt mastic sealing layer (3) are sequentially laid on the slope surface. The rear of the leveling adhesive wall (1) is a dam body filling material. The leveling adhesive The bonding wall (1) is asphalt concrete, the maximum particle size of the asphalt concrete aggregate is not greater than 19 mm, the asphalt content is 3.5% to 5.0%, the porosity is 10 to 15%, the thermal stability coefficient is ≤4.5, and the water stability coefficient is ≥0.

85. The left side of the lower bottom of the upper leveling bonding wall (1) is aligned with the left side of the upper bottom of the lower leveling bonding wall (1), and the upper leveling bonding wall (1) is built on the plane formed by the upper bottom of the lower leveling bonding wall (1) and the dam body filling material behind the lower leveling bonding wall (1).

2. The anti-seepage and slope-fixing integrated dam asphalt concrete panel structure according to claim 1 is characterized by: The height h of the leveling cementing wall (1) is consistent with the compacted thickness of the dam body filling material, and the slope of the water-facing surface is consistent with the upstream design slope of the dam body, which is 1:n.

3. The anti-seepage and slope-fixing integrated dam asphalt concrete panel structure according to claim 2 is characterized by: The upper bottom width a of the leveled cemented wall (1) is ≥ , d is the minimum thickness of the asphalt concrete anti-seepage layer required by the design; the slope ratio of the back surface of the leveling cementitious wall (1) is i=6:1~9:

1.

4. The anti-seepage and slope-fixing integrated dam asphalt concrete panel structure according to claim 1 is characterized by: The leveled cementitious wall (1) is formed by extrusion construction using an extruder.

5. A construction method for an anti-seepage and slope-fixing integrated dam asphalt concrete panel structure according to any one of claims 1 to 4, characterized in that: The following steps are included: After the leveling cementing wall (1) is formed by extrusion construction using an extruder, the dam body is filled behind the leveling cementing wall (1) so that the top of the dam body filling material is flush with the top of the leveling cementing wall (1) to form a plane; each layer of the leveling cementing wall (1) has a trapezoidal cross section of the same size, with a narrow upper bottom and a wide lower bottom; On the plane formed by the lower leveling cementing wall (1) and the dam body filling material, a new layer of leveling cementing wall (1) is extruded and formed to ensure that the water-facing surfaces of the upper and lower leveling cementing walls (1) form a flat slope surface, and dam material is filled at the rear, and the above steps are repeated until the leveling cementing wall (1) is constructed to the dam top; Finally, on the slope surface of the water-facing surface of the several-layer leveled cement wall (1), an asphalt concrete anti-seepage layer (2) is first laid from the bottom to the top of the dam, and then an asphalt mastic sealing layer (3) is laid.

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