CN202416338U - Foundation for novel grating dam - Google Patents

Abstract

The utility model provides a novel foundation structure form with simple structure and higher integrated strength and stiffness. The defect of the traditional grating dam at the aspect of resisting the impact and damage of high-speed flowing debris flow rocks and big gravels is overcome. According to the foundation located on a hard rock, a reinforced concrete foundation is designed on one side of the dam impacted by the debris flow and is served as a gravity load, an antidumping extension actuating arm (area 3) is designed on the other side departed from the impact force, and the hard rock on the lower part is served as the foundation. The novel foundation structure form has the advantages that: (1) the extension actuating arm is increased and the antidumping torque is increased, namely, the volume of a gravity foundation is reduced and the construction cost is lowered; (2) the problem that the pouring quality of large-volume concrete is difficult to control is avoided; and (3) a passive earth pressure far more than a frictional force generated on the foundation by a foundation dead load is utilized as an anti-sliding force endured by the hard rock under the extension actuating arm (area 3), so that the anti-sliding force of the grating dam is increased. The safety of the foundation is ensured and the purpose of preventing and treating debris flow disaster is achieved.

Description

A kind of basis of novel crib dam

One, technical field

The utility model relates to geological disaster engineering Prevention Technique field and retaining wall engineering etc.Especially mud-stone flow disaster prevention and cure project.

Two, technical background

Nowadays, geological disaster takes place frequently, and directly has influence on human normal life and social stability at present.Particularly mud-stone flow disaster in case take place, will bring huge life to threaten to the mankind, bring enormous economic loss to society, and therefore, how preventing the generation of disaster problem such as mud-rock flow effectively and reducing casualty loss to greatest extent becomes the task of top priority.Yet the prediction technology of mud-stone flow disaster is still immature at present, and the complexity of the factor of mud-rock flow generation is brought out in the landslide in addition, and also there is difficulty greatly in the generation of the mud-rock flow that how to forecast with unerring accuracy.So, take the rational and effective engineering measure, the loss that the reduction mud-stone flow disaster takes place to be brought is only practicable first-selection.

Reduce the engineering measure of mud-rock flow damage effect and often adopt the check dam engineering.Check dam has interception silt and floating thing, drains water body, divides dried up and gravelly soil effect, cuts down the mud-rock flow peak flood flow, regulates that the water of raceway groove is husky to be concerned and to the groove channel erosion effect.Debris dam is pressed the dam structure form, can be divided into various ways such as gravity dam, arch dam, crib dam and cable wire dam.Wherein the gravity crib dam is a kind of important dam type, and is as shown in Figure 1, and crib dam has good water permeability, can tackle silt selectively, also has to be easy to advantages such as desilting after washing away little, dam under the dam.But the shortcoming on gravity crib dam basis is that material usages such as cement, steel are big, and cost is high, and basic antiskid moves that ability is little, the bulk strength of dam body and rigidity are less, can't keep out swiftly flowing mud-rock flow tap and impact with big gravel.

Three, utility model content

The utility model provides the basis of the bigger novel crib dam of a kind of simple in structure, bulk strength and rigidity, has overcome the deficiency of existing crib dam basis aspect the swiftly flowing mud-rock flow tap of opposing and gravel impact failure greatly.

The utility model solves the technical scheme that its technical problem adopted: a kind of basis of novel crib dam; Comprise grid post 1, counterfort 2, basis 3 and the arm of force 4; 3 upper ends, basis, one side is stretched out an arm of force 4, and grid post 1 links to each other with counterfort 2, and embeds overall structure of basis 3 formation.

In technique scheme, the section of the described arm of force 4 is a rectangle, and the length of the arm of force 4 can change.

The beneficial effect of the utility model is; Increase the bigger intensity and the integral rigidity arm of force; Provide bigger overturning or slip resistance analysis moment, antiskid to move ability, thereby can resist swiftly flowing mud-rock flow tap and big gravel impact failure, reach the purpose that prevents mud-stone flow disaster.

Four, description of drawings

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

Fig. 1 is the vertical section sketch map on traditional crib dam basis

1-grid post among the figure; The 2-counterfort; The 3-basis

Fig. 2 is the vertical section sketch map of the utility model

1-grid post among the figure; The 2-counterfort; The 3-basis; The 4-arm of force

Fig. 3 is the utility model threedimensional model sketch

Five, the specific embodiment

(1) height of dam confirms

The high more storage capacity of dam body is big more, and is obvious more to the protective effect of bottom area engineering services, but the also rapid increasing of required engineering quantity and cost with the increase of height of dam.Therefore, the dam body height is calculated by formula (1):

H _d＝H _m+ΔH+H _L (1)

In the formula: H _dBe crib dam height (m); H _mBe the maximum tap of mud-rock flow high (m); Δ H is that mud-rock flow has dashed height (m); H _LDeposition thickness (m) for mud-rock flow;

(2) design of dam body

Confirm the dam body form of fracture according to " mud-stone flow disaster prevention and cure project design specifications ".Dam body adopts reinforced concrete structure, and concrete design parameters is confirmed by field engineering geological conditions and designing requirement.Grid adopts inlays reinforcing bar or gauze wire cloth, and the network interface size is (2) design by formula:

$1.5\≤\frac{b}{D_m}\≤4.0---\left(2\right)$

(3) sliding weight of steelyard type Base Design

In the mud-stone flow disaster prevention and cure project; Debris dam is mainly tackled a large amount of silts that carry in the mud-rock flow, and the impact force of slowing down mud-rock flow, to reduce the destruction to downstream configurations; So require debris dam that very strong shock resistance is arranged, this performance is presented as that on the whole overturning or slip resistance analysis and antiskid move ability.

Novel foundation mainly leans on basis (3) deadweight and the arm of force (4) to resist the overturning moment that the impulsive force of mud flow is brought, and the length of the arm of force (4) is calculated according to designing requirement and confirmed; In order to reduce whole base concrete consumption, the length of the arm of force (4) of can extending is equivalent to reduce the volume of gravity basis (3), can reduce construction costs.

(4) stable checking computations

1. checking computations are stablized in overturning or slip resistance analysis

Crib dam is around the overturning or slip resistance analysis coefficient of stability of preceding toe:

$K_0=\frac{M_R}{M_D}---\left(3\right)$

The overturning or slip resistance analysis coefficient of stability should be chosen by similar case history, when lacking instance, and K ₀Value is not less than 1.1.

2. antiskid moves checking computations

Move safety K by the antiskid of gravity crib dam computing whole _c, K _cValue should be less than 1.0-1.2.

3. resistance to overturning checking computations

The resistance to overturning checking computations can be adopted slip circle method, and safety K can be with reference to similar case history, and the K value should be not less than 1.25.

Claims (3)

1. the basis of a novel crib dam; Comprise grid post (1), counterfort (2), basis (3) and the arm of force (4); It is characterized in that: upper end, basis (3) one side is stretched out an arm of force (4), and grid post (1) links to each other with counterfort (2), and embeds overall structure of basis (3) formation.

2. the basis of novel crib dam according to claim 1, it is characterized in that: the length of the arm of force (4) can change.

3. the basis of novel crib dam according to claim 1, it is characterized in that: the section of the arm of force (4) is a rectangle.

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