CN212506154U

CN212506154U - Shore spillway foundation drainage structure

Info

Publication number: CN212506154U
Application number: CN202020892316.7U
Authority: CN
Inventors: 王瑞
Original assignee: China Hydropower Consulting Group Guiyang Survey And Design Institute Of Geotechnical Engineering Co ltd; PowerChina Guiyang Engineering Corp Ltd
Current assignee: China Hydropower Consulting Group Guiyang Survey And Design Institute Of Geotechnical Engineering Co ltd; PowerChina Guiyang Engineering Corp Ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2021-02-09
Anticipated expiration: 2030-05-25

Abstract

The utility model discloses a bank spillway foundation drainage structure, including building the base face, arranged spillway foundation drainage structure on building the base face, this spillway foundation drainage structure includes following component: the concrete is characterized by comprising sand-free concrete, foundation drainage blind materials, geotextile and joint bars; the foundation drainage blind material is a drainage pipe network which is arranged in a criss-cross mode, a row of foundation joint bars are respectively arranged on two sides close to the drainage pipe network, and the bottom of the foundation drainage blind material is leveled by adopting non-sand concrete. By adopting the structure, the grooves of longitudinal and transverse drain pipes (ditches) can be arranged without excavating, the drainage structure is directly arranged on the bedrock construction base surface, the gradient of a basic drainage pipe network can be effectively ensured, the blockage of the drainage pipe network is avoided, the drainage effect of the basic drainage pipe network is ensured, the construction is simplified, the engineering quantity is saved, the engineering progress is accelerated, and the engineering quality is ensured.

Description

Shore spillway foundation drainage structure

Technical Field

The utility model belongs to the technical field of hydraulic and hydroelectric engineering, be applicable to dam crest cable pit and dam crest escape canal design and construction among the hydraulic and hydroelectric engineering.

Background

For flexible dams such as face dams, earth and rockfill dams, core dams and the like, spillways are often arranged on the bank side to ensure the safety of dam structures in order to discharge flood exceeding the storage regulation capacity of reservoirs or reduce reservoir water levels. According to engineering experience, the control of the seepage water flow of the foundation of the bank spillway is strengthened, and the control is an important factor for ensuring the structural safety of the spillway, so that the seepage-proofing drainage system of the foundation of the spillway is particularly important.

The foundation drainage device for the bank spillway is used for timely draining the seepage water flow of the foundation, reducing the uplift pressure of the foundation of the spillway and ensuring the safety of the spillway structure. In general engineering, drainage pipes (ditches) in longitudinal and transverse directions are usually arranged under a bottom plate of a spillway to form a network of mutually communicated drainage pipes (ditches), and the drainage pipes (ditches) are converged into a main drainage pipe (ditch) and then uniformly discharged out of the field; in large-scale projects, one or more drainage galleries are often arranged under the bottom plate of the spillway, and drainage pipes (ditches) are connected into the drainage galleries for basic drainage. However, the designed section size of the drainage pipe (ditch) is only dozens of centimeters generally, the drainage pipe (ditch) with the small size is excavated on the basement rock building surface of the spillway according to the designed position, the designed section is difficult to ensure no matter the blasting mode or the manual mode is adopted, the foundation drainage pipe (ditch) can be arranged in the structural foundation expanding and excavating direction, and the over-excavated part needs to be backfilled; and certain unevenness can be formed on the basis of the drainage pipe (ditch), the designed gradient is difficult to ensure, and the blockage of a drainage pipe network is easy to form. Therefore, construction procedures are additionally added, the quantity of engineering is increased, the cost is higher, the construction period is difficult to control, and the engineering quality is difficult to ensure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bank spillway basis drainage structures to the not enough of prior art existence.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a bank spillway foundatin drainage structure, has arranged spillway foundatin drainage structure on the foundatin face including building the base face, this spillway foundatin drainage structure includes following component: the concrete is characterized by comprising sand-free concrete, foundation drainage blind materials, geotextile and joint bars; the foundation drainage blind material is a drainage pipe network which is arranged in a criss-cross mode, a row of foundation joint bars are respectively arranged on two sides close to the drainage pipe network, and the bottom of the foundation drainage blind material is leveled by adopting non-sand concrete.

Furthermore, the inserted bars are phi 16 steel bars with the length of 1m and the distance of 2m, and are exposed by 0.3m so as to fix the foundation drainage blind material.

Furthermore, the strength grade of the sand-free concrete is not lower than C15, and the permeability coefficient is not lower than 5 multiplied by 10^-1cm/s。

Further, the surface of the sand-free concrete is provided with a slope so that the foundation drainage blind material can drain smoothly.

Further, the longitudinal overlapping length of the foundation drainage blind material is not shorter than 0.2m, and the foundation drainage blind material is wrapped with geotextile.

Furthermore, the basic drainage blind material is tightly attached to the base surface, and the lead wire is used for fixing the basic drainage blind material on the dowel.

Furthermore, a drain hole is arranged at the position with the water seepage point, the drain hole is vertical to the building base surface, the aperture is phi 76mm, the length is 3-5 m, and a phi 50mm drain blind pipe is arranged in the drain hole.

Compared with the prior art, the utility model discloses cancelled the excavation of spillway foundation drainage pipe network slot, simplified the work progress, convenient construction has reduced the basis and has surpassed to dig the handling engineering volume, saves the engineering investment. Adopt no sand concrete to make level drainage blind material basis, can effectively guarantee the design slope of basic drainage pipe network, guarantee basic drainage effect. The geotextile is wrapped outside the drainage blind material, so that the concrete slurry of the bottom plate of the drainage tank can be prevented from permeating into the drainage blind material, and the seepage water flow can be discharged into the drainage blind material, so that the effects of filtering sand and draining water are achieved. Adopt the lead wire to be fixed in the blind material of basic drainage on the dowel bar, cause the blind material of basic drainage to shift, destroy and lead to the blind material of drainage to lose the drainage effect when avoiding spillway concrete placement. The drainage holes are formed in positions with water seepage points, and the drainage blind pipes are plugged in the drainage holes, so that the foundation seepage water can be effectively led to the foundation drainage blind materials to be discharged downwards, and the damage to the structure caused by the foundation centralized seepage water is avoided.

By adopting the structure, the grooves of longitudinal and transverse drain pipes (ditches) can be arranged without excavating, the drainage structure is directly arranged on the bedrock construction base surface, the gradient of a basic drainage pipe network can be effectively ensured, the blockage of the drainage pipe network is avoided, the drainage effect of the basic drainage pipe network is ensured, the construction is simplified, the engineering quantity is saved, the engineering progress is accelerated, and the engineering quality is ensured.

Drawings

FIG. 1 is a typical cross-sectional view of a basic drainage structure;

figure 2 is a typical cross-sectional view of a concentrated water penetration point of a basic drainage structure.

Description of reference numerals: 1-building a base surface; 2-sand free concrete; 3-basic drainage blind material; 4-geotextile; 5-inserting ribs; 6-drainage hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the present invention is implemented as follows:

after 1 excavation of shoreside spillway basis foundational plane is accomplished, 1 arranges spillway basis drainage structures on the foundational plane, mainly includes following component: 2, sand-free concrete; a base drainage blind material 3; geotextile 4; a dowel bar 5; a drain hole 6 (inner plug blind pipe). The specific arrangement mode is as follows:

the spillway foundation drainage blind material 3 is a drainage pipe network which is arranged in a criss-cross mode, a row of foundation dowel bars 5 are respectively arranged on two sides close to the position of the foundation drainage pipe network, and the dowel bars 5 are phi 16, are 1m in length and 2m in distance and are exposed for 0.3m so as to fix the foundation drainage blind material 3.

The foundation drainage blind material 3 adopts the sand-free concrete 2 for leveling when the foundation is uneven, the strength grade of the sand-free concrete 2 is not lower than C15, and the permeability coefficient is not lower than 5 multiplied by 10^-1cm/s, the water seepage of the foundation can be ensured to be discharged from the non-fine concrete 2 to the blind foundation drainage material 3, and the surface of the non-fine concrete 2 is provided with a certain gradient according to the design, so that the blind foundation drainage material 3 can drain water smoothly, and the leveling layer of the non-fine concrete 2 cannot invade the concrete position of the bottom plate of the spillway.

The foundation drainage blind material 3 is arranged on the leveling layer of the sand-free concrete 2, the longitudinal lap joint length of the foundation drainage blind material 3 is not shorter than 0.2m, and the foundation drainage blind material 3 is wrapped by geotextile 4, and the geotextile 4 is arranged, so that the concrete slurry of the bottom plate of the drainage tank can be prevented from permeating into the foundation drainage blind material 3, and the seepage water can be discharged into the foundation drainage blind material 3, thereby playing the roles of filtering sand and draining water.

The blind material 3 of basis drainage is closely laminated with the base face to adopt the lead wire to be fixed in the blind material 3 of basis drainage on the dowel 5, cause the blind material 3 of basis drainage to shift, destroy when avoiding spillway concrete placement, lead to the blind material 3 of drainage to lose drainage effect.

As shown in figure 2, a drainage hole 6 is arranged at a position with a water seepage point, the drainage hole 6 is perpendicular to a building base surface 1, the aperture is phi 76mm, the length is 3-5 m, and a drainage blind pipe with the diameter of phi 50mm is arranged in the drainage hole 6, so that water seepage points can be effectively centralized and drained to drainage blind materials to be discharged downwards, and the damage of the structure caused by the centralized water seepage of a foundation is avoided.

Of course, the above is only the specific application example of the present invention, and the present invention has other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. The utility model provides a bank spillway foundatin drainage structure, includes base plane (1), its characterized in that: arrange spillway foundation drainage structures on base level (1) under construction, this spillway foundation drainage structures includes following component: the concrete comprises sand-free concrete (2), foundation drainage blind materials (3), geotextile (4) and joint bars (5); the blind material of basic drainage (3) is the drainage pipe network of criss-cross arrangement, respectively sets up one row of basic dowel steel (5) in the both sides that are close to this drainage pipe network position, and the bottom of blind material of basic drainage (3) adopts no sand concrete (2) to make level.

2. The shore spillway foundation drainage structure of claim 1, wherein: the inserted steel bars (5) are phi 16 steel bars with the length of 1m and the interval of 2m, and are exposed by 0.3m so as to fix the foundation drainage blind material (3).

3. The shore spillway foundation drainage structure of claim 1, wherein: what is needed isThe strength grade of the sand-free concrete (2) is not less than C15, and the permeability coefficient is not less than 5 multiplied by 10^-1cm/s。

4. The shore spillway foundation drainage structure of claim 1, wherein: the surface of the sand-free concrete (2) is provided with a slope so that the foundation drainage blind material (3) can drain water smoothly.

5. The shore spillway foundation drainage structure of claim 1, wherein: the longitudinal overlapping length of the foundation drainage blind material (3) is not shorter than 0.2m, and the foundation drainage blind material is wrapped with geotextile (4).

6. The shore spillway foundation drainage structure of claim 1, wherein: the basic drainage blind material (3) is tightly attached to the base surface, and the basic drainage blind material (3) is fixed to the dowel bars (5) through lead wires.

7. The shore spillway foundation drainage structure of claim 1, wherein: and arranging a drain hole (6) at the position with the water seepage point, wherein the drain hole (6) is vertical to the building base plane (1), the aperture is phi 76mm, the length is 3-5 m, and a phi 50mm drain blind pipe is arranged in the drain hole (6).