CN108360473A

CN108360473A - The construction method of bank is chosen in a kind of three-dimensional scatter energy dissipating

Info

Publication number: CN108360473A
Application number: CN201810131029.1A
Authority: CN
Inventors: 夏鹏飞; 霍倩倩
Original assignee: Yangling Vocational and Technical College
Current assignee: Yangling Vocational and Technical College
Priority date: 2018-02-09
Filing date: 2018-02-09
Publication date: 2018-08-03

Abstract

The present invention is that bank construction method is chosen in a kind of three-dimensional scatter energy dissipating, can increase the aerial aeration effect of water body, increase the overboard region area of overflow, is reduced into water discharge per unit width, and effect of energy dissipation is improved, and decrease washes away riverbed.The technical solution adopted by the present invention is：Step 1：The conventional wide continuous outlet point midway for choosing bank is lifted certain altitude upwards, and it is connected with straight line with choosing bank initial position midpoint and choose bank outlet port both sides endpoint, makes to choose bank interior central area and forms a upward sphenoid structure；Step 2：Choose bank initial position midpoint in the plane with choose bank outlet both sides endpoint linearly connect, it is in triangular shape to make the structure in the plane, this at two straight line choose projection on bank in anti-arc and form an arc, choose bank initial position midpoint and be connected by the camber line with bank terminal position both sides endpoint is chosen；Step 3：Bank both sides abutment wall will be chosen simultaneously to cancel.

Description

The construction method of bank is chosen in a kind of three-dimensional scatter energy dissipating

One, technical field：

The present invention relates to belong to flood-discharge energy-dissipating field in hydraulic and hydroelectric engineering, and in particular to bank construction is chosen in a kind of three-dimensional scatter energy dissipating Method.

Two, background technology：

In hydraulic and hydroelectric engineering, is limited sometimes by terrain or for from the aspect of to construction investment, there is one kind to let out Water buildings jet bucket axis is in nearly orthogonal with river center line（The two angle is 70 ° ~ 110 °）The case where（Such as Fig. 1 institutes Show）, good dispersion energy dissipating should be realized in such cases, and is needed to limit and chosen the flip shot distance of bank overflow to ensure not wash away River opposite bank bank slope.

It is followed from the perspective of energy dissipating, in engineering and is dispensed into water to increase effective upstream face product as much as possible to realize The principle of energy dispersive, there are commonly inclined cutouts of the narrow slit type of longitudinal stretching overflow and overflow extending transversely etc. effectively to disappear It can work.However, slit-type energy dissipation be mainly by the narrow effect of the beam to jet bucket use flowing water body in it is longitudinal with stand to drawing It stretches, this will certainly increase sater professionals to be unfavorable for the erosion control of opposite bank bank slope；Although and chamferring bank has certain lateral expansion Effect is dissipated, but it is more faint to the influence for reducing the farthest drop point of overflow.

Three, invention content

Bank construction method is chosen in a kind of three-dimensional scatter energy dissipating of present invention offer, to prevent water area from not washing away river opposite bank bank slope.

To achieve the above object, the technical solution adopted by the present invention is：

The construction method of bank is chosen in a kind of three-dimensional scatter energy dissipating, it is characterised in that：The construction procedure is：

Step 1：The conventional wide continuous outlet point midway for choosing bank is lifted certain altitude upwards, and it is originated with bank is chosen Position midpoint and choose bank outlet port both sides endpoint and be connected with straight line, make to choose bank interior central area formed one it is prominent upwards The sphenoid structure risen；

Step 2：Choose bank initial position midpoint in the plane with choose bank outlet both sides endpoint linearly connect, to make the structure Be in triangular shape in the plane, this at two straight line choose projection on bank in anti-arc and form an arc, choose bank initial position midpoint and choose bank Terminal position both sides endpoint is connected by the camber line；

Step 3：Bank both sides abutment wall will be chosen simultaneously to cancel.

Sphenoid end height h=（1.1~2.0）h₀, h₀To choose the depth of water in bank, when river is wider, center can be made to choose flowing water Amount appropriateness increases, and h can use smaller value at this time；Conversely, when positioned at Narrow Valleys, h can be taken higher value, to reduce overflow most It is remote choose away from.

When river relative narrower, make arctan（h/L）≥（π/180）θ, wherein θ are that can be protected with what angle indicated Card choose bank have farthest choose away from choose angle, take 40 °, L is the floor projection length for choosing bank ogee section.

Compared with prior art, the invention has the advantages that and effect：

The present invention makes water body realize the dispersion of diversification after the flip shot of flood releasing structure end is gone out, and can shorten overflow of growing It chooses away from the erosion damage to weaken water body for river opposite bank bank slope, and largely interior in a limited space can realize water The high degree of dispersion of body increases the overboard region area of overflow, reduces into water discharge per unit width to increase the aerial aeration effect of water body, Effect of energy dissipation is improved, decrease washes away riverbed.

Four, it illustrates

Fig. 1 discharge structures and river nearly orthogonal typical layout；

Fig. 2 is that the present invention chooses bank structural schematic diagram；

Fig. 3 is the structural model figure of the present invention；

Fig. 4 is the vertical view of Fig. 2；

Fig. 5 is the side view of Fig. 2；

Fig. 6, which is that routine is wide, continuously chooses bank vertical view；

Fig. 7, which is that routine is wide, continuously chooses bank side view；

Fig. 8 " three-dimensional scatter energy dissipating " structure typical flow pattern one；

Fig. 9 " three-dimensional scatter energy dissipating " structure typical flow pattern two；

Figure 10 chooses bank overflow drop point canonical schema；A routinely chooses bank；B three-dimensional scatters choose bank.

Five, specific implementation mode

It is limited with reference to specific embodiment technical scheme of the present invention is further：

The construction method of bank is chosen in a kind of three-dimensional scatter energy dissipating（Referring to Fig. 2 and Fig. 7）, the construction procedure is：

Step 3：Simultaneously to increase the horizontal proliferation effect for choosing bank, bank both sides abutment wall will be chosen and cancelled.

The present invention chooses bank separation beam corporeity, the transversely acting that flow of growing is applied by wedge structure so that go out The trend of oriented two side diffusion of tongue of carrying water, it is lateral by intermediate wedge structure further as the reason chosen bank side wall and be cancelled Notch flip shot that the part water body of effect occurs from side due to the cancellation of abutment wall and go out, to substantially increase flow Horizontal proliferation so that the water length that enters that flow enters downstream river course is significantly increased, and greatly reduces water and flows into water discharge per unit width； Simultaneously because the presence of intermediate wedge structure so that flow has different flip shot angles upwards vertical, to make overflow in centre Closely, the remote inner concavity in both sides enters water form, and by numerical computations, it is as shown in Figure 8 and Figure 9 to choose bank typical flow pattern for this.

Influence the major parameter that overflow enters water form（Referring to Fig. 2-Fig. 5）Be sphenoid end height h, h size it is direct Be related to overflow of growing laterally and longitudinal assignment of traffic ratio, the h the big, choose bank midline position water flow it is smaller and two Side water flow is bigger, and upstream area depression is deeper for overflow drop point center, and vice versa（It is typical that difference chooses bank overflow drop point Schematic diagram is shown in Figure 10）；It can make both sides water flow excessive if h is excessive and enter water discharge per unit width to increase both sides.In order to make Flow disperse as far as possible and realize well shorten overflow longitudinally choose away from purpose, general h=（1.1~2.0）h₀, h₀To choose bank The interior depth of water, but orographic condition can also have an impact h, when river is wider, center can be made to choose streamflow and moderately increased, h can at this time Take smaller value；Conversely, when positioned at Narrow Valleys, h can be taken higher value, farthest be chosen to reduce overflow away from concrete numerical value needs It just can determine that according to river width.

In addition, when river relative narrower, arctan can be made（h/L）≥（π/180）θ, wherein θ are to be indicated with angle Can ensure choose bank have farthest choose away from choose angle, generally take 40 °, so as to effectively shorten overflow it is farthest choose away from.

Claims

1. the construction method of bank is chosen in a kind of three-dimensional scatter energy dissipating, it is characterised in that：The construction procedure is：

Step 3：Bank both sides abutment wall will be chosen simultaneously to cancel.

2. the construction method of bank is chosen in a kind of three-dimensional scatter energy dissipating according to claim 1, it is characterised in that：Sphenoid end Height h=（1.1~2.0）h₀, h₀To choose the depth of water in bank, when river is wider, make center choose streamflow moderately increase, at this time h take compared with Small value；Conversely, when positioned at Narrow Valleys, h is taken into higher value, to reduce overflow farthest choose away from.

3. the construction method of bank is chosen in a kind of three-dimensional scatter energy dissipating according to claim 1, it is characterised in that：When river is opposite When relatively narrow, make arctan（h/L）≥（π/180）θ, wherein θ be with angle indicate can ensure to choose bank have it is farthest choose away from Choose angle, take 40 °, L chooses the floor projection length of bank ogee section.