CN204266170U - A kind of dam foundation gallery syndeton - Google Patents

Abstract

The utility model discloses a kind of a kind of dam foundation gallery syndeton avoiding structural joint to lose waterproof effect under the effect of external applied load, comprise bank slope basement rock, Riverbed and dam foundation gallery; Described dam foundation gallery is arranged on Riverbed, the inner chamber that dam foundation gallery comprises concrete wall and surrounded by concrete wall; The inside of described bank slope basement rock is provided with grouting adit, and the end of described dam foundation gallery embeds and is arranged on bank slope basement rock and is connected with grouting adit; Gap between described dam foundation gallery and grouting adit is structural joint, is provided with the first border waterstop in described structural joint.Dam foundation gallery is embedded by its end and is arranged on bank slope basement rock and is connected with grouting adit, makes structural joint be in the inside of bank slope basement rock; Bank slope basement rock is better to the fixed effect of dam foundation gallery, and dam foundation gallery is influenced less by structural joint during external applied load, and waterstop is not easily destroyed, and avoids structural joint and loses waterproof effect.

Description

A dam foundation corridor connection structure

technical field

The utility model belongs to the field of water conservancy and hydropower engineering, in particular to a dam foundation gallery connection structure.

Background technique

The earth-rock dam has the advantages of easy material selection, low cost, simple structure, strong foundation adaptability, and good seismic performance. It is a dam type widely used in the field of water conservancy and hydropower engineering. The dam foundation corridor is one of the important components of the earth-rock dam body. The dam foundation corridor has multiple purposes such as foundation grouting, drainage, inspection and maintenance, safety monitoring, and traffic in the dam.

Due to the pressure of the overlying dam body and high water head, as well as the uneven settlement of the bedrock on both banks and the river bed foundation, the corridor of the dam foundation is very complicated in force and difficult to construct. The existing dam foundation corridor is generally arranged on the bank slope bedrock and the riverbed overlay in an overlapping manner. The dam foundation corridor includes a concrete wall and an inner cavity surrounded by the concrete wall. The dam foundation corridor along the dam foundation corridor Structural seams are arranged in the circumferential direction, and a circumferential waterstop is arranged in the structural seams. Since the dam foundation corridor is a reinforced concrete rigid structure, in order to adapt to the uneven settlement of the foundation, the dam foundation corridor generally only sets structural joints at the base-cover boundary line formed by the boundary between the bank slope bedrock and the river bed cover layer, but the actual application situation shows that , the opening and staggering deformation of the structural joints is very large. Although multiple waterstops are designed for the structural joints, it is still difficult to adapt to the excessive deformation of the structural joints, and the structural joints have different degrees of water stop damage and leakage. After the structural joints seep water, because the structural joints are completely wrapped by the core wall material, the core wall material will be taken out with the seepage, and when the structural joints are subjected to water-stop treatment such as grouting, the grouting materials will easily enter the core wall of the dam body, which will affect the structure of the dam body. bring adverse effects.

The utility model patent No. 201220388743.7 discloses a core wall dam bank slope overlapping dam foundation gallery structure, the structural joints are set on the dam foundation gallery corresponding to the bedrock foundation, and the structural joints are far from the bedrock foundation and the river bed The distance between the base-cover boundary formed by the boundary line between the cover layers is 1-30m. Although the structural joints in this patent are not set at the foundation-cover boundary, the dam foundation gallery is still lapped on the bedrock of the bank slope, which is similar to a simply supported beam structure lapped on the bedrock of the bank slope. The uneven settlement of the bedrock and river bed foundation has little influence, but the structural joints will still have large deformation under the action of other external loads, and the leakage phenomenon is still relatively serious; in addition, the structural joints are still partly connected with the core wall of the dam body. If there is no material contact, there are still problems that the core wall material is taken away after the water seal of the structural joint is damaged, and the grout easily enters the core wall of the dam body when the structural joint is repaired by grouting.

Utility model content

The technical problem to be solved by the utility model is to provide a dam foundation corridor connection structure that prevents structural seams from losing their waterproof effect under the action of external loads.

In order to solve the above-mentioned technical problems, the utility model provides a dam foundation corridor connection structure, including bank slope bedrock, river bed covering layer and dam foundation corridor; the dam foundation corridor is arranged on the river bed covering layer, and the dam foundation corridor includes concrete wall and an inner cavity surrounded by concrete walls; the inside of the bank slope bedrock is provided with a grouting flat hole, and the end of the dam foundation gallery is embedded on the bank slope bedrock and connected with the grouting flat hole; the dam foundation The gap between the corridor and the grouting flat hole is a structural joint, and a first circumferential waterstop is arranged in the structural joint.

Further, a concrete layer is provided on the surface of the inner wall of the grouting flat hole; a joint grouting pipe is provided in the concrete layer, one end of the joint grouting pipe communicates with the structural joint, and the other end of the joint grouting pipe It is connected with the grouting flat hole.

Further, a second circumferential waterstop is also provided in the structural seam, and the second circumferential waterstop is located within the circle of the first circumferential waterstop.

Further, the part of the dam foundation corridor embedded in the bedrock of the bank slope is a rock-entry section, and the shortest length of the rock-entry section is 1-3m.

Further, an elastic cushion is provided on the outer surface of the rock entry section.

Further, the rock entry section is provided with a wall joint grouting pipe penetrating through the concrete wall.

Further, the dam foundation gallery is provided with a cover plate matching the dam foundation gallery, and the side of the cover plate is attached to the bedrock of the bank slope.

Further, the dam foundation gallery is provided with a flexible water-stop layer along the intersecting line where the cover plate and the dam foundation gallery meet.

The beneficial effects of the utility model are: the dam foundation gallery is embedded on the bank slope bedrock through its end and connected with the grouting flat hole, so that the structural joints are inside the bank slope bedrock; the bank slope bedrock fixes the dam foundation gallery The effect is good. When the dam foundation gallery is subjected to external loads, the structural joints are less affected, and the waterstop is not easily damaged, which prevents the structural joints from losing their waterproof effect. The joint grouting pipe can be used to grout and water-stop the structural joints when the water-stopping of the structural joints is damaged due to factors such as dam deformation and foundation settlement. The second circumferential waterstop further enhances the waterproof effect of the structural joints. The shortest length of the rock-entry section is 1-3m, which ensures the fixing effect of the bank slope bedrock on the dam foundation corridor. The elastic cushion can reduce the stress extreme value of the rock entry section in the bank slope bedrock, and avoid excessive constraints. The wall joint grouting pipe can be backfilled and grouted, so that the dam foundation corridor and the bank slope bedrock are closely and firmly connected. The cover plate can form a barrier between the structural joint and the dam body. The flexible water-stop layer can cooperate with the cover plate to separate the structural joints from the dam body. Even if the water-stop of the structural joints is damaged and leaks, it can still prevent the core wall material from being taken away with the seepage. When grouting repairs to the structural joints, the grouting materials It will not enter the core wall of the dam body and will not damage the structure of the dam body.

Description of drawings

Fig. 1 is the implementation structural representation of the utility model;

Fig. 2 is A-A sectional view among Fig. 1;

The marks in the figure are: bank slope bedrock 1, grouting flat hole 11, concrete layer 111, joint grouting pipe 112, riverbed covering layer 2, dam foundation corridor 3, concrete wall 31, inner cavity 32, structural joint 33, first Circumferential waterstop 331 , second peripheral waterstop 332 , rock entry section 34 , elastic cushion 341 , wall joint grouting pipe 342 , cover plate 35 , flexible waterstop 36 and base-cover boundary 4 .

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, a kind of dam foundation corridor connection structure, comprises bank slope bed rock 1, river bed covering layer 2 and dam foundation corridor 3; Described dam foundation corridor 3 is arranged on the riverbed covering layer 2, and dam foundation corridor 3 comprises Concrete wall 31 and the inner cavity 32 surrounded by concrete wall 31; the inside of the bank slope bedrock 1 is provided with a grouting flat hole 11, and the end of the dam foundation corridor 3 is embedded in the bank slope bedrock 1 and Link to each other with grouting flat hole 11; When grouting flat hole 11 is set, ensure that the opening of grouting flat hole 11 corresponds to the end of dam foundation corridor 3 so as to connect; The gap between described dam foundation corridor 3 and grouting flat hole 11 is Structural seam 33, the first circumferential waterstop 331 is provided in the structural seam 33; the first circumferential waterstop 331 is set in the structural seam 33 for one week, as shown in Figure 2, usually the structural seam 33 still needs to be Fill the joints and use caulking glue, for example: use asphalt flakes to fill the joints in the structural joint 33, and use RCCanNCD special caulking glue to fill the seams. The special caulking glue for RCCanNCD requires bonding strength ≥ 1.0MPa and tensile strength ≥ 1.5 MPa, elongation at break ≥ 300%, and maintain flexibility above -15°C. The above-mentioned dam foundation corridor 3 is embedded on the bank slope bedrock 1 through its end, instead of the lap joint connection in the prior art. The dam foundation corridor 3 is firmly connected to the bank slope bedrock 1, which avoids external loads that make the structure The seam 33 is opened or misplaced and deformed. Moreover, the structural joints 33 are located inside the bedrock 1 of the bank slope and have little contact with the water body, so the waterproof effect is good.

Considering the construction quality and the deformation of the dam during the operation period, foundation settlement and other factors lead to the damage of the first circumferential waterstop 331 in the structural joint 33, as a later repair and reinforcement, as shown in Figure 1, in the grouting flat hole 11 A concrete layer 111 is provided on the surface of the inner wall; the concrete layer 111 is provided with a seam grouting pipe 112, one end of the seam grouting pipe 112 communicates with the structural joint 33, and the other end of the seam grouting pipe 112 is connected to the grouting level Hole 11 is connected. When the first circumferential waterstop 331 in the structural joint 33 is damaged, the structural joint 33 can be grouted and water-stopped through the joint grouting pipe 112 .

In order to further strengthen the waterproof effect of the structural seam 33, as shown in Figures 1 and 2, a second circumferential waterstop 332 is also provided in the structural seam 33, and the second circumferential waterstop 332 is located at the first Inside the circle of the circumferential water stop 331 ; the second circumferential water stop 332 can be selectively installed according to the actual engineering situation and the water stop effect of the first circumferential water stop 331 .

In order to ensure the fixing effect of the bank slope bedrock 1 on the dam foundation gallery 3, the part embedded in the bank slope bedrock 1 on the dam foundation gallery 3 is the rock entry section 34, and the shortest length of the rock entry section 34 is 1 ~3m; because the bank slope bedrock 1 has a certain slope, when the dam foundation corridor 3 is embedded in the bank slope bedrock 1, an intersecting line structure will be formed. The shortest distance of the embedding length in the slope bedrock 1 part, when the top of the dam foundation corridor 3 is arched, the shortest distance of the length of the rock entry section 34 is the length of the arc-shaped upper edge of the top of the rock entry section 34, as shown in Figure 1. 34 upper.

Specifically, in order to reduce the stress extreme value of the rock entry section 34 in the bank slope bedrock 1 and avoid excessive constraints, the outer surface of the rock entry section 34 is provided with an elastic cushion 341, as shown in Figure 1 and Figure 1. 2; the elastic cushion 341 can be made of SR flexible material; the elastic cushion 341 can be filled between the outer surface of the rock entry section 34 and the bank slope bedrock 1, and can also be fixed in the rock entry section by a fixed structure 34 on the outer surface, for example: covered and fixed by a steel plate or a rubber plate.

Specifically, the rock-entry section 34 is provided with a wall seam grouting pipe 342 that runs through the concrete wall 31; the top of the dam foundation corridor 3 is generally arched, and a preferred embodiment of the wall seam grouting pipe 342 is shown in Figure 2. Three wall seam grouting pipes 342 are symmetrically arranged on the arched surface of the top of the rock entry section 34, and a wall seam grouting pipe 342 is pre-buried on the side wall corresponding to the upstream on the rock entry section 34. The tube 342 is located in the same plane and 0.5m from the structural joint. Then, on the side wall corresponding to the upstream on the rock entry section 34, a wall joint grouting pipe 342 with a distance of 3.5 to 5.5 m from the structural joint is pre-buried. It should be noted that the wall joint grouting pipe 342 only passes through the concrete wall 31 and cannot damage the elastic cushion 341 . After the earth-rock dam body is filled to the design elevation, use the wall joint grouting pipe 342 to backfill and grout the space between the rock entry section 34 and the bank slope bedrock 1, so that the dam foundation gallery 3 and the bank slope bedrock 1 are closely and firmly connected .

As shown in Figure 1 again, described dam foundation gallery 3 is provided with the cover plate 35 that matches with dam foundation gallery 3, and the side of described cover plate 35 is bonded with bank slope bedrock 1; Cover plate 35 can be in structure A barrier is formed between the seam 33 and the dam body. Specifically, the dam foundation gallery 3 is provided with a flexible water-stop layer 36 along the intersecting line where the cover plate 35 and the dam foundation gallery 3 meet. The flexible water-stop layer 36 can cooperate with the cover plate 35 to block the indirect communication between the structural joint 1 and the dam body. Even if the water-stop belt in the structural joint 3 is damaged and leaks, it can still prevent the core wall material from being taken away with seepage. When performing grouting repair on the structural joint 3, the grouting material will not enter the core wall of the dam body and will not damage the dam body structure. The flexible waterproof layer 36 can be made of SR flexible material.

Claims (8)

1. A dam foundation gallery connection structure, comprising bank slope bedrock (1), riverbed overlay (2) and dam foundation gallery (3); said dam foundation gallery (3) is arranged on the riverbed overlay (2) , the dam foundation gallery (3) comprises a concrete wall (31) and an inner cavity (32) surrounded by the concrete wall (31); it is characterized in that: the inside of the bank slope bedrock (1) is provided with a grouting flat hole ( 11), the end of the dam foundation gallery (3) is embedded on the bank slope bedrock (1) and connected with the grouting flat hole (11); the dam foundation gallery (3) is connected with the grouting flat hole (11) The gap between them is a structural seam (33), and a first circumferential waterstop (331) is arranged in the structural seam (33). 2. A kind of dam foundation gallery connecting structure as claimed in claim 1, is characterized in that: the inner wall surface of described grouting flat hole (11) is provided with concrete layer (111); Described concrete layer (111) is provided with There is a seam grouting pipe (112), one end of the seam grouting pipe (112) communicates with the structural joint (33), and the other end of the seam grouting pipe (112) communicates with the grouting flat hole (11). 3. A dam foundation corridor connection structure as claimed in claim 1, characterized in that: a second circumferential water stop (332) is also provided in the structural joint (33), and the second circumferential stop The water strip (332) is located within the circle of the first circumferential waterstop (331). 4. A kind of dam foundation gallery connecting structure as claimed in claim 1, is characterized in that: the part embedded in the bank slope bedrock (1) on the dam foundation gallery (3) is a rock entry section (34), the The shortest length of the rock-entry section (34) is 1-3m. 5. A dam foundation gallery connection structure according to claim 4, characterized in that: an elastic cushion (341) is provided on the outer surface of the rock entry section (34). 6. A dam foundation corridor connection structure according to claim 4 or 5, characterized in that: said rock entry section (34) is provided with a wall seam grouting pipe (342) penetrating through the concrete wall (31). 7. A dam foundation corridor connection structure according to any one of claims 1 to 5, characterized in that: the dam foundation corridor (3) is provided with a cover plate matching the dam foundation corridor (3) (35), the side of the cover plate (35) is bonded to the bank slope bedrock (1). 8. A dam foundation corridor connection structure as claimed in claim 7, characterized in that: said dam foundation corridor (3) is along the intersecting line at the junction of the cover plate (35) and the dam foundation corridor (3) A flexible water-stop layer (36) is provided.