Waterproof structure of earth-rock dam gallery structure joint

Abstract

This invention discloses a water-stopping structure for a structural joint in an earth-rock dam gallery, relating to the field of water conservancy and hydropower engineering technology. It includes surrounding rock, a grouting adit, and a foundation gallery. A structural joint is provided between the grouting adit and the foundation gallery. A concrete water-stopping base is located at the bottom of the foundation gallery. A water-stopping structure is provided on the structural joint, comprising a first copper water-stop and a second copper water-stop. This invention uses two copper water-stops in the structural joint, with the first copper water-stop embedded in the concrete water-stopping base at the bottom, thus improving the seepage prevention reliability of the structural joint.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering technology, and more specifically, it is a water-stopping structure for the structural joint of an earth-rock dam gallery. Background Technology

[0002] With the continuous advancement of water conservancy and hydropower development in my country, many major rivers where water resource development bases are located face thick overburden layers, especially in western my country. The thick overburden layers of riverbeds are mostly characterized by large variations in distribution thickness, complex composition, and significant structural differences.

[0003] In water conservancy and hydropower projects, in order to shorten the construction period of earth-rock dams and facilitate the reinforcement of dam foundation seepage prevention and safety monitoring during operation, foundation galleries are usually set in the dam body of medium, high and above earth-rock dams. Structural joints are generally not set in the foundation galleries along the dam axis in the riverbed section. Structural joints are usually set near the boundary between bedrock and overburden to connect with the grouting adits on both banks. Near the boundary between bedrock and overburden, since the grouting adits on both banks are located in the bedrock, their own deformation is very small. The foundation galleries in the dam body undergo more complex triaxial deformation under the action of rockfill filling, overburden deformation and water pressure. The deformation morphology of the structural joints is complex and the dislocation is relatively large compared with the grouting adits on both banks. The water stop is easily damaged and leakage occurs, which affects the safe and stable operation of the project. The structural joints of the gallery are one of the main weak points of dam foundation seepage prevention.

[0004] Therefore, it is necessary to develop a seepage-proof, safe, reliable, simple-designed, and easy-to-construct water-stopping structure that can be embedded in the structural joints of the foundation corridors on both banks of various earth-rock dams. Summary of the Invention

[0005] The primary objective of this invention is to overcome the shortcomings of the aforementioned background technology and to provide a water-stopping structure for the joints of an earth-rock dam gallery structure.

[0006] The second objective of this invention is to overcome the shortcomings of the aforementioned background technology and to provide a construction method for the water-stopping structure of the joint in the earth-rock dam gallery structure.

[0007] To achieve the aforementioned first objective, the technical solution of the present invention is as follows: a water-stopping structure for a structural joint in an earth-rock dam gallery, characterized in that: it includes surrounding rock, a grouting tunnel located within the surrounding rock, and a foundation gallery located within the surrounding rock; a structural joint is provided between the grouting tunnel and the foundation gallery; concrete water-stopping bases are provided at the bottom of the upstream side and the bottom of the downstream side of the foundation gallery; a water-stopping structure is provided on the structural joint; the water-stopping structure includes a first copper water-stopping layer on the side closer to the surrounding rock and a second copper water-stopping layer on the side farther from the surrounding rock; the lower end of the first copper water-stopping layer extends into the concrete water-stopping base; and the second copper water-stopping layer is a closed-loop structure.

[0008] In the above technical solution, the water-stopping structure also includes a surface water-stopping layer, which includes a V-shaped opening located between the surrounding rock and the first copper water-stopping layer, with the V-shaped opening facing the surrounding rock; the side of the V-shaped opening closest to the surrounding rock has a protective film, and the space between the protective film and the V-shaped opening is filled with flexible filler.

[0009] In the above technical solution, a rubber rod is provided at the end of the V-shaped opening away from the surrounding rock.

[0010] In the above technical solution, the structural joint is filled with asphalt-impregnated fir wood boards.

[0011] In the above technical solution, the protective film is fixed to the V-shaped opening by expansion bolts, and a hot-dip galvanized flat steel is provided between the expansion bolts and the V-shaped opening.

[0012] In the above technical solution, the contact surfaces between the structural joint and the grouting tunnel and the foundation corridor are all coated with asphalt.

[0013] In the above technical solution, both the first and second copper waterstops are W-shaped copper waterstops; the diameter of the rubber rod is 100mm.

[0014] In the above technical solution, the concrete water-stop base is connected to the surrounding rock through anchor rods.

[0015] To achieve the second objective mentioned above, the technical solution of the present invention is: a construction method for the water-stopping structure of the structural joint of an earth-rock dam gallery, characterized by comprising the following steps:

[0016] Step 1: First, pour the concrete for the foundation corridor. After completion, use it as a template for pouring the concrete for the grouting tunnel.

[0017] Step 2: Install the protective film, hot-dip galvanized flat steel and expansion bolts in sequence on one side of the basic corridor, and fix the rubber rod to form a V-shaped opening;

[0018] Step 3: Then install the precast steel formwork at the other end of the foundation corridor, and install the protective film, hot-dip galvanized flat steel, expansion bolts, first copper waterstop, second copper waterstop and asphalt fir wood board in the structural joint on one side of the precast steel formwork, and then fill the V-shaped opening with flexible filler.

[0019] Step 4: Finally, pour the concrete for the grouting tunnel.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1) The present invention provides two W-shaped copper waterstops in the structural joint, and the first W-shaped copper waterstop is embedded in the concrete waterstop base at the bottom, which improves the seepage prevention reliability of the structural joint.

[0022] 2) The present invention sets a surface water stop around the structural joint, which works in conjunction with two W-shaped copper water stops to prevent seepage, further enhancing the seepage prevention effect of the structural joint. Attached Figure Description

[0023] Figure 1 This is a longitudinal sectional view of the present invention.

[0024] Figure 2 for Figure 1 Cross-sectional view at point AA.

[0025] Figure 3 for Figure 2 Cross-sectional view at point BB.

[0026] Figure 4 for Figure 1 At point C and Figure 3 A magnified view of a section at point D.

[0027] Among them, 1-surrounding rock, 2-grouting tunnel, 3-foundation corridor, 31-concrete waterstop base, 32-anchor rod, 4-structural joint, 5-waterstop structure, 51-first copper waterstop, 52-second copper waterstop, 53-surface waterstop, 531-V-shaped opening, 532-protective membrane, 533-flexible filler, 534-rubber rod, 535-asphalt fir board, 536-expansion bolt, 537-hot-dip galvanized flat steel, 6-boundary line between bedrock and overburden. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but these descriptions are not intended to limit the invention and are merely illustrative. The advantages of the present invention will become clearer and easier to understand through this description.

[0029] Referring to the attached drawings, the water-stopping structure of the structural joint of the earth-rock dam gallery is characterized by: including surrounding rock 1, a grouting tunnel 2 located within the surrounding rock 1, and a foundation gallery 3 located within the surrounding rock 1. A structural joint 4 is provided between the grouting tunnel 2 and the foundation gallery 3. Concrete water-stopping bases 31 are provided at the bottom of the upstream side and the bottom of the downstream side of the foundation gallery 3. A water-stopping structure 5 is provided on the structural joint 4. The water-stopping structure 5 includes a first copper water-stop 51 on the side close to the surrounding rock 1 and a second copper water-stop 52 on the side away from the surrounding rock 1. The lower end of the first copper water-stop 51 extends into the concrete water-stopping base 31, and the second copper water-stop 52 is a closed-loop structure.

[0030] The water-stopping structure 5 also includes a surface water-stopping layer 53, which includes a V-shaped opening 531 located between the surrounding rock 1 and the first copper water-stopping layer 51, with the V-shaped opening 531 facing the surrounding rock 1; the V-shaped opening 531 has a protective film 532 on the side near the surrounding rock 1, and a flexible filler 533 is filled between the protective film 532 and the V-shaped opening 531.

[0031] A rubber rod 534 is provided at the end of the V-shaped opening 531 away from the surrounding rock 1.

[0032] The structural joint 4 is filled with asphalt-impregnated fir wood board 535 or high-density polyethylene closed-cell foam board.

[0033] The protective film 532 is fixed to the V-shaped opening 531 by expansion bolts 536, and a hot-dip galvanized flat steel 537 is provided between the expansion bolts 536 and the V-shaped opening 531.

[0034] The contact surfaces of the structural joint 4 with the grouting tunnel 2 and the foundation corridor 3 are all coated with asphalt.

[0035] The first copper waterstop 51 and the second copper waterstop 52 are both W-type copper waterstops; the rubber rod 534 has a diameter of 100mm.

[0036] The concrete water-stop base 31 is connected to the surrounding rock 1 through anchor rods 32.

[0037] In actual use, a surface water stopper 53 is installed around the perimeter of the structural joint 4, but no surface water stopper 53 is installed at the bottom of the structural joint 4.

[0038] A construction method for the water-stopping structure of the structural joint of an earth-rock dam gallery, characterized by the following steps:

[0039] Step 1: First, pour the concrete for the foundation corridor 3. After completion, use it as a template for pouring the concrete for the grouting tunnel 2.

[0040] Step 2: Install the protective film 532, hot-dip galvanized flat steel 537 and expansion bolts 536 in sequence on one side of the basic corridor 3, and fix the rubber rod 534 to form a V-shaped opening 531.

[0041] Step 3: Then install the precast steel formwork at the other end of the foundation corridor 3, and install the protective film 532, hot-dip galvanized flat steel 637, expansion bolts 536, first copper waterstop 51, second copper waterstop 52 and asphalt fir wood board 535 or high-density polyethylene closed-cell foam board in the structural joint 4 on one side of the precast steel formwork, and then fill the V-shaped opening 531 with flexible filler 533;

[0042] Step 4: Finally, pour the concrete for the grouting tunnel 2. The precast steel formwork is not removed, but is used as part of the corridor structure.

[0043] In step 1, either the foundation corridor 3 or the grouting tunnel 2 can be poured first.

[0044] All other unspecified parts belong to the prior art.

Claims

1. A construction method of a waterstop structure of a structural joint of an earth and rockfill dam gallery, characterized by: The application discloses a waterstop structure of a structure joint of a soil-rock dam gallery, and belongs to the technical field of waterstop structures. The waterstop structure of the structure joint of the soil-rock dam gallery comprises surrounding rock (1), a grouting tunnel (2) in the surrounding rock (1) and a foundation gallery (3) in the surrounding rock (1), a structure joint (4) is arranged between the grouting tunnel (2) and the foundation gallery (3), concrete waterstop bases (31) are arranged on the upstream side bottom and the downstream side bottom of the foundation gallery (3), a waterstop structure (5) is arranged on the structure joint (4), the waterstop structure (5) comprises a first copper waterstop (51) close to one side of the surrounding rock (1) and a second copper waterstop (52) away from the other side of the surrounding rock (1), the first copper waterstop (51) extends into the concrete waterstop base (31) at the lower end, and the second copper waterstop (52) is in a closed loop structure. The waterstop structure (5) further comprises a surface waterstop (53), the surface waterstop (53) comprises a V-shaped opening (531) between the surrounding rock (1) and the first copper waterstop (51), the V-shaped opening (531) is open towards the surrounding rock (1), a protective film (532) is arranged on the side of the V-shaped opening (531) close to the surrounding rock (1), and flexible filler (533) is filled between the protective film (532) and the V-shaped opening (53). A rubber rod (534) is arranged at the end of the V-shaped opening (531) away from the surrounding rock (1). The first copper waterstop (51) and the second copper waterstop (52) are both W-shaped copper waterstops. The protective film (532) is arranged in the grouting tunnel (2), the protective film (532) is convex in the middle and concave on both sides. The surface waterstop (53) and the two W-shaped copper waterstops work cooperatively to play a blocking seepage role in waterstop, and further enhance the anti-seepage effect of the structure joint. One end of the first copper waterstop (51) extends into the concrete waterstop base (31) on the upstream side bottom of the foundation gallery (3), and the other end extends into the concrete waterstop base (31) on the downstream side bottom of the foundation gallery (3). The protective film (532) is fixed on the V-shaped opening (531) through expansion bolts (536), and galvanized flat steel (537) is arranged between the expansion bolts (536) and the V-shaped opening (53). The method comprises the following steps: Step 1: pouring the concrete of the foundation gallery (3) first, and after completion, taking the foundation gallery (3) as a formwork for pouring the concrete of the grouting tunnel (2); Step 2: sequentially arranging the protective film (532), the galvanized flat steel (537) and the expansion bolts (536) on one side of the foundation gallery (3), fixing the rubber rod (534) and forming the V-shaped opening (531); Step 3: then arranging a prefabricated steel formwork at the other end of the foundation gallery (3), arranging the protective film (532), the galvanized flat steel (637), the expansion bolts (536), the first copper waterstop (51), the second copper waterstop (52) and the asphalt fir board (535) in the structure joint (4) on one side of the prefabricated steel formwork, and then filling the flexible filler (533) in the V-shaped opening (531); Step 4: finally pouring the concrete of the grouting tunnel (2), and the prefabricated steel formwork is not removed, but is taken as a part of the gallery structure.

2. The construction method of the waterstop structure of the earth rock dam gallery structure joint according to claim 1, characterized in that: The structural joint (4) is filled with pitch fir board (535).

3. The construction method of the waterstop structure of the earth-rock dam gallery structure joint according to claim 2, characterized in that: The contact surface of the structural joint (4) with the grouting flat hole (2) and the foundation gallery (3) is painted with pitch.

4. The construction method of the waterstop structure of the earth-rock dam gallery structure joint according to claim 3, characterized in that: The rubber rod (534) has a diameter of 100 mm.

5. The construction method of the waterstop structure of the earth-rock dam gallery structure joint according to claim 4, characterized in that: The concrete water-stopping base (31) is connected with the surrounding rock (1) through an anchor rod (32).

Images