CN206128018U - Reticular fiber concrete structure's supplementary dissipation structure - Google Patents

Abstract

The utility model discloses an auxiliary energy dissipation structure of a reticular fiber concrete structure, which comprises two parts, a bottom support assembly and a top support assembly, the bottom support assembly includes a bottom pressure pad, and the bottom pressure pad A lower supporting steel pipe is fixed on the upper top surface of the lower supporting steel pipe, and a screw mechanical top is fixed on the top of the lower supporting steel pipe, and a top supporting rod is fixed on the top of the lifting rod of the screw mechanical top. a mating pin hole. The single support can carry out coarse adjustment and fine adjustment to the support height, thereby increasing the adjustment range, improving the adjustment accuracy and ensuring the adjustment efficiency.

Description

Auxiliary Energy Dissipation Structure of Reticular Fiber Concrete Structure

technical field

The utility model relates to the technical field of flood discharge, energy dissipation and vibration reduction of water conservancy and hydropower projects, and relates to an auxiliary energy dissipation device of a mesh fiber concrete structure.

Background technique

In water conservancy and hydropower projects, the construction of hydraulic structures creates a water level difference between the upstream and downstream, which has a lot of energy. Most of the potential energy will inevitably be converted into kinetic energy when it is vented to the downstream, which must be properly handled. Otherwise, the downstream river bed will be severely scoured, and even the bank slope will collapse and the dam will fail. Therefore, the reasonable selection and design of energy dissipation measures are of great significance to the hub layout, dam safety and engineering quantity.

The stilling pool is the main body of the hydraulic energy dissipator. Setting auxiliary energy dissipators in the stilling pool can enhance the energy dissipation effect, shorten the pool length, and reduce the project cost. The main task of energy dissipation measures is to consume energy in the internal resistance and external resistance of the water flow as much as possible, limit its scouring damage to the greatest extent, or take measures to control the water flow to lift the water flow away from the discharge structure so that it can scour the river bed without causing damage. Affect the safety of buildings and nearby slopes. At present, the commonly used types of energy dissipation are: deflected flow energy dissipation, underflow energy dissipation, surface flow energy dissipation and force dissipation. The deflecting flow energy dissipation is to use the deflecting flow nose sill at the exit of the discharge structure to throw the rapid discharge into the air, and then fall into the riverbed far away from the building to connect with the downstream water flow. However, the energy dissipation of the deflected flow has serious erosion on the downstream, and there are many accumulations, and the tail water fluctuation and atomization are relatively large.

Utility model content

In order to solve the above-mentioned technical problems, the utility model proposes an auxiliary energy dissipation of the reticular fiber concrete structure that can improve the energy dissipation rate, protect the bottom plate of the stilling pool, reduce the generation of flood mist, and reduce the vibration of flood discharge in view of the characteristics of high dam flood discharge. work.

In order to solve the above technical problems, the utility model proposes the following technical solutions: an auxiliary energy dissipation structure of reticular fiber concrete structure, a three-stage reticular structure is arranged at equal distances and equal elevations above the stilling pool downstream of the discharge weir, The dislocation arrangement of reticular fiber concrete with staggered space structure is formed, so that the water flow impacts the reticular structure to achieve the effect of multi-level auxiliary energy dissipation; the reticular fiber concrete structure is composed of plane reticular fiber concrete and its four reinforced concrete piers It is composed of equal height and equidistant arrangement above the bottom plate of the stilling basin.

The three-level network structure is composed of the first-level network structure, the second-level network structure and the third-level network structure; the first-level network structure is composed of the first-level planar network structure and the second The second-level network structure is composed of the second-level planar network structure and the second-level support piers erected, and the third-level network structure is composed of the third-level planar network structure and its erected The heights of the first-level buttresses, second-level buttresses, and third-level buttresses decrease gradually according to the gradient, which are 3/4 and 1/4 of the height of the spill outlet and the bottom plate of the stilling basin, respectively. 2, 1/4.

The first-level planar network structure, the second-level planar network structure, and the third-level planar network structure are planar network structures cast from high-strength fiber concrete, and their thickness depends on the scale of the project and the amount of flood discharge. The first-level buttress, the second-level buttress, and the third-level buttress are cubic columnar structures cast from high-reinforced concrete, and their size depends on the project layout and flood discharge.

The first-level planar network structure, the second-level planar network structure, and the third-level planar network structure are respectively connected to the upper part of the first-level support pier, the second-level support pier, and the third-level support pier. The heights of the three-stage buttresses are different to form a three-dimensional dislocation space arrangement.

The reticular fiber concrete used in the first level planar network structure, the second level planar network structure and the third level planar network structure is steel fiber reinforced concrete.

The steel fiber adopts a woven mesh with 0.9mm steel wire and a mesh size of 10mm×10mm.

The utility model has the following beneficial effects:

1. The water flow violently impacts the planar network structure, and most of the energy is eliminated through multiple impacts, and the remaining part of the energy is eliminated by the tail sill of the stilling pool;

2. The network structure arranged with multi-level contours and equal distances changes the direction of the original water flow, reduces the flow velocity of the water flow, eliminates the energy of the water flow step by step, and makes the water flow in the stilling pool flow smoothly, so as to improve the energy dissipation rate and protect the bottom plate of the stilling pool , The purpose of reducing the generation of flood and fog;

3. The water flow eliminates energy due to the impact on the mesh structure arranged with equal height and equidistant difference in each level, and the energy hitting the bottom plate of the stilling pool is small, so the impact on the bottom plate is small, and the impact on the stilling pool and its downstream is reduced. vibration;

4. Compared with the stilling pool and auxiliary energy dissipators arranged in a plane, the structure of the three-dimensionally arranged energy dissipator in the utility model is more stable, and the effect of energy dissipation and anti-vibration is better.

Description of drawings

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

Fig. 1 is a three-dimensional schematic diagram of the arrangement of energy dissipaters in an embodiment of the present invention.

Fig. 2 is a front view of the arrangement of energy dissipators according to the embodiment of the present invention.

Fig. 3 is a top view structural diagram of the utility model.

Fig. 4 is a schematic diagram of the first level planar network structure of the present invention.

In the figure: the first-level planar network structure 1, the first-level support pier 2, the second-level planar network structure 3, the second-level support pier 4, the third-level planar network structure 5, and the third-level support pier 6 , chute section 7, energy dissipation pool 8, nose sill 9.

detailed description

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1-4, an auxiliary energy-dissipating structure of a reticulated fiber concrete structure, a three-stage reticulated structure is arranged at equal distances and equal height differences above the stilling basin 8 downstream of the discharge weir 7, forming a reticulated spatial structure. The misplaced arrangement of fiber-reticulated fiber concrete makes the water flow hit the reticulated structure to achieve the effect of multi-stage auxiliary energy dissipation; the reticulated fiber-reinforced concrete structure is composed of planar reticulated fiber-reinforced concrete and its four reinforced concrete buttresses, arranged at equal heights and equidistant above the bottom of the stilling basin.

Further, the three-level network structure is composed of a first-level network structure, a second-level network structure and a third-level network structure; the first-level network structure is composed of a first-level planar network structure 1 and a The erected first-level buttress 2 is composed of the second-level network structure composed of the second-level planar network structure 3 and the second-level buttress 4 erected thereon, and the third-level network structure is composed of the third-level The planar network structure 5 and the third-level buttress 6 erected; the heights of the first-level buttress 2, the second-level buttress 4, and the third-level buttress 6 decrease gradually according to the gradient, which are respectively the flood outlet and the third-level buttress. 3/4, 1/2, 1/4 of the height of the bottom plate of the stilling pool.

Further, the first-level planar network structure 1, the second-level planar network structure 3, and the third-level planar network structure 5 are planar network structures cast from high-strength fiber concrete, and their thickness depends on It depends on the scale of the project and the amount of flood discharge; the first-level buttress 2, the second-level buttress 4, and the third-level buttress 6 are cubic columnar structures poured from high-reinforced concrete, and their sizes depend on the project layout. and flood discharge.

Further, the first-level planar network structure 1, the second-level planar network structure 3, and the third-level planar network structure 5 are respectively connected with the first-level support pier 2, the second-level support pier 4, and the third-level support pier. The upper parts of the first-level buttresses 6 are connected, and the heights of the three-level buttresses are different to form a three-dimensional dislocation space arrangement.

Further, the reticular fiber concrete used in the first-level planar network structure 1 , the second-level planar network structure 3 , and the third-level planar network structure 5 is steel fiber reinforced concrete.

Further, the steel fiber adopts a braided mesh with 0.9mm steel wire and a mesh size of 10mm×10mm.

The engineering design of this embodiment comprises the following steps:

Step 1: Determine the length L of the stilling basin 8 and the height H between the spill outlet and the bottom plate of the stilling basin according to the discharge water flow characteristics of the discharge weir 7;

Step 2: According to the height difference of the stilling pool 8, pour the height of the third-level buttress. The height of the first-level buttress 2 is set to 3H/4, and the height of the second-level buttress 4 is set to H/2. The height of the third-level buttress 6 is set to H/4;

Step 3: according to the length L of the stilling basin 8, the four buttresses of the tertiary network structure are equidistantly arranged;

Step 4: According to the width of the stilling pool 8, determine the distance between the buttresses of the first-level buttresses 2, the second-level buttresses 4, and the third-level buttresses 6, and the plane sizes of the planar network structures 1, 3, and 5;

Step 5: The material and mix ratio of the high-strength fiber concrete specimen poured in this embodiment are as follows:

1 material

Mesh fiber: a net made of steel wire with a single diameter of 0.9 mm, a mesh size of 10 mm × 10 mm, and a single wire tensile strength of 400 MPa;

Reinforcement: use mild steel with a diameter of 6 and 8, which is grade I steel, and 10 and 20 are grade II steel;

Cement: Ordinary Portland cement with grade 525;

Sand: Medium to coarse sand.

2 mix ratio and molding

All test pieces are made of dry hard mortar or fine-grained concrete, the mix ratio is 1:1:6, and the water-cement ratio is 0.38-0.45. All specimens were formed by vibration.

Through the above description, those skilled in the art can make various changes and modifications without departing from the technical idea of the utility model, all of which are within the protection scope of the utility model. Unfinished matters of the utility model belong to the common knowledge of those skilled in the art.

Claims (5)

1. An auxiliary energy-dissipating structure of reticular fiber concrete structure, characterized in that a three-stage reticular structure is arranged at equal distances and equal height differences above the stilling pool (8) downstream of the discharge weir (7), forming a space The staggered reticular fiber concrete structure is dislocated so that the water flow impacts the reticular structure to achieve the effect of multi-level auxiliary energy dissipation; the reticular fiber concrete structure is composed of plane reticular fiber concrete and its four reinforced concrete piers. Arranged at the same height and equidistant above the bottom plate of the stilling basin; The three-level network structure is composed of a first-level network structure, a second-level network structure and a third-level network structure; the first-level network structure is composed of a first-level planar network structure (1) and its The erected first-level support piers (2), the second-level network structure is composed of the second-level planar network structure (3) and the second-level support piers (4) erected, the third-level network structure The structure is composed of the third-level planar network structure (5) and the third-level pier (6) erected; the first-level pier (2), the second-level pier (4), the third-level pier The height of the pier (6) decreases gradually according to the gradient, which are respectively 3/4, 1/2, and 1/4 of the height of the spill outlet and the bottom plate of the stilling basin. 2. The auxiliary energy-dissipating structure of a reticular fiber concrete structure according to claim 1, characterized in that: the first-level planar reticular structure (1), the second-level planar reticular structure (3), The third-level planar network structure (5) is a planar network structure cast from high-strength fiber concrete, and its thickness depends on the scale of the project and the amount of flood discharge; the first-level support piers (2), the second-level The first-level buttress (4) and the third-level buttress (6) are cubic columnar structures cast from high-reinforced concrete, and their size depends on the project layout and flood discharge. 3. The auxiliary energy-dissipating structure of a reticular fiber concrete structure according to claim 1, characterized in that: the first-level planar reticular structure (1), the second-level planar reticular structure (3), The third-level planar network structure (5) is connected to the upper part of the first-level buttress (2), the second-level buttress (4), and the third-level buttress (6) respectively, and the height of the third-level buttress Different forms a three-dimensional dislocation space arrangement. 4. An auxiliary energy-dissipating structure of reticular fiber concrete structure according to claim 1, characterized in that: the first-level planar reticular structure (1), the second-level planar reticular structure (3), The reticular fiber concrete used in the third-level planar reticular structure (5) is concrete reinforced by steel fibers. 5. The auxiliary energy-dissipating structure of a reticular fiber concrete structure according to claim 4, characterized in that: the steel fiber is a braided mesh with 0.9 mm steel wire and a mesh size of 10 mm × 10 mm.