CN210597405U - Ancient building shock insulation barrier - Google Patents

Abstract

The utility model belongs to the technical field of the building takes precautions against earthquakes, concretely relates to ancient building shock insulation protective screen, including distributing the shock insulation ditch body around the ancient building, the outside of the shock insulation ditch body squeeze into two rows of shock insulation campshes perpendicularly downwards, the shock insulation campshed be hollow pipe pile, the shock insulation campshed take reinforced fly ash concrete precast tubular pile. The arrangement form of the shock insulation row piles is intensive, and the aperture of each shock insulation row pile is smaller than the distance between adjacent shock insulation row piles; and foam concrete blocks are filled in the shock insulation groove body. The utility model discloses a campshed-compound shock insulation system of isolation ditch weakens the harmful effects that different frequency, different forms of vibration caused to being protected the building, and construction cost is low, has promoted this compound shock insulation system's environmental suitability simultaneously, possesses wide range of application.

Description

Ancient building shock insulation barrier

Technical Field

The utility model belongs to the technical field of the building takes precautions against earthquakes, concretely relates to ancient building shock insulation protective screen especially can have good shock insulation effect to artificial vibration and seismic oscillation simultaneously.

Background

Along with the continuous development and progress of human society, the problems caused by vibration are more and more extensive and the number of the problems is increased day by day, and because the vibration generated in the production and the living of people has no influence on the life of people at all times, the vibration threatens a plurality of ancient buildings with extremely high cultural historical value and great humanistic significance in China. In particular, seismic waves are vibrations that propagate around the seismic source, and refer to elastic waves that radiate from the source to the surroundings. The wave propagation method can be divided into three types, namely longitudinal waves (P waves), transverse waves (S waves) (both the longitudinal waves and the transverse waves belong to body waves) and surface waves (L waves).

The research finds that the damage of earthquake motion to the ancient buildings is mainly reflected in the following two points: 1. the transverse wave causes the ancient building to swing horizontally, which causes the ancient building to be damaged, and the destructive power is very large. The horizontal reciprocating acting force is applied to the building, and when the size and the caused deformation exceed the limit of the historic building beam structure for resisting earthquake, the whole historic building can be inclined or toppled to cause damage; 2. longitudinal wave makes ancient building produce jolting from top to bottom, because some ancient buildings are long time, its vertical stability is relatively poor, and when seismic force is great, can make the bottom increase very big dynamic load as load-carrying members's post in the twinkling of an eye, the dead weight on stack upper portion, thereby when surpassing bottom post bearing capacity, thereby the bottom post can collapse and lead to destroying.

The method is characterized in that a barrier shock insulation measure is adopted, namely a shock insulation barrier is arranged on a vibration wave propagation path to damage the vibration wave propagation path, so that the loss of vibration wave energy is caused, and the purpose of reducing or even eliminating the influence of the vibration wave on a protected building is achieved.

Current barrier isolation is largely divided into two broad categories, namely continuous isolation barriers and discontinuous barriers. The continuous shock insulation barrier is typically represented by a shock insulation groove, when an artificial vibration source with higher vibration frequency and earthquake motion are performed, the properly designed shock insulation groove can achieve a good shock insulation effect, but a part of vibration sources with lower vibration frequency have generally longer wavelength, if the hollow groove is selected as the shock insulation barrier, the hollow groove is required to have a very large depth, the requirement has a large operation difficulty in actual construction, if a continuous wall is selected as the shock insulation barrier, a very large engineering quantity can be generated, the construction cost is greatly improved, and particularly when the geological conditions of a construction site are very poor, the continuous shock insulation barrier is not suitable for being used as a protective measure.

SUMMERY OF THE UTILITY MODEL

On effectively resisting seismic wave and other high frequency undulant bases, can not effectually weaken the energy that the lower vibration of frequency brought in order to overcome the continuity protective screen to and receive the place condition restriction and can not carry out the continuity shock insulation protective screen of great degree of depth excavation, the utility model provides an ancient building shock insulation protective screen has row stake-shock insulation ditch composite construction's shock insulation protective screen, and this compound shock insulation protective screen can effectual reduction high frequency vibration to the influence of building, can weaken the harmful effects of low frequency vibration to the building simultaneously again.

The utility model discloses a solve the technical problem that single continuity shock insulation protective screen exists and take technical measure as follows:

ancient building shock insulation protective screen, including distributing the shock insulation ditch body around the ancient building, the outside of the shock insulation ditch body squeeze into two rows of shock insulation row's stake perpendicularly downwards, the shock insulation row stake be hollow pipe pile, the shock insulation row stake take reinforced fly ash concrete precast tubular pile. The arrangement form of the shock insulation row piles is intensive, and the aperture of each shock insulation row pile is smaller than the distance between adjacent shock insulation row piles; and foam concrete blocks are filled in the shock insulation groove body. The influence of the vibration of different vibration frequencies on the protected building is reduced through a combined shock insulation system of the hollow pipe pile and the shock insulation ditch body filled with the foam concrete building block.

The specific technical scheme is as follows: consider the demand of different topography and site conditions, after comprehensively considering each side factor, the utility model discloses a concrete size of isolation ditch body as follows: the depth of the shock insulation ditch body is 5m, the width is 1.5m, the distance between the shock insulation ditch body and the protected ancient building is 2m-15m, a certain number of steel beam supports are arranged in the shock insulation ditch body, the steel beam support interval can be set to be 2m-3m according to the surrounding soil condition, and collapse of the inner walls of the two sides of the ditch body due to lack of necessary supports is prevented.

U-shaped steel plate piles are arranged in the shock insulation trench body, a circle of top beam is arranged at the top of each U-shaped steel plate pile, top supporting beams are arranged by taking the top beams as nodes, the horizontal distance between the top supporting beams is 2m-3m, and the U-shaped steel plate piles are combined into a whole by the top supporting beams and the top beam.

The shock insulation groove filler is a novel light material containing a large number of closed air holes, which is formed by adding a chemical foaming agent or a physical foaming agent into slurry prepared from a cementing material, an admixture, a modifier, brine and the like after foaming, mixing, stirring, casting, molding and naturally curing, and has the advantages of convenient material selection and low manufacturing cost, and the technical performance of the foam concrete block prepared from fly ash, sand, stone powder, tailings, construction waste and calcium carbide powder serving as main raw materials meets the national standard requirement of foam concrete block; secondly, it is light, high strength, not afraid of the impact, has lightened the pressure of the packing material to the bottom of the shock insulation ditch body at the same time, secondly, the stability of this kind of packing material is good, it is difficult to produce crackle to dry shrink, and have certain water-resistant ability, can keep the performance of the packing material in the shock insulation ditch body under the effective situation of ground infiltration, the most important characteristic is that its shock resistance is good, because the foam concrete block belongs to the porous material, have lower elastic modulus, thus make it have good absorption and dispersion effects to the shock insulation impact load, the very big energy of the vibration wave has been consumed in the course of the vibration propagation, thus the shock insulation performance of the better reinforced shock insulation protective screen.

The shock insulation row pile does not adopt the traditional concrete cast-in-place pile, but selects the fly ash concrete precast tubular pile. Compared with common concrete, the concrete added with the fly ash has a plurality of unique advantages. The fly ash is a pozzolanic material and has no gelation property, when water exists at normal temperature, the fly ash can perform secondary reaction with other components in concrete to generate hydrated calcium silicate gel which is insoluble in water, so that the possibility of dissolution is reduced, pores in the concrete are filled, the strength and the impermeability of the concrete are improved, and the reason that the fly ash improves the performance of the concrete is also two main factors: first, topographical effects. The main mineral composition of the fly ash is a glass body, and the surfaces of the spherical glass bodies are smooth, the granularity is fine, the texture is compact, the internal specific surface area is small, and the adsorption force to water is small, so that the water requirement for preparing concrete is reduced by adding the fly ash, the early drying shrinkage of the concrete is reduced, and the compactness of the concrete is greatly improved; second, the fill effect. The fine particles in the fly ash are uniformly distributed in the cement particles, so that not only can gaps among the cement particles be filled, but also the particle composition of the cementing material can be improved, and the compactness of cement colloid is increased. Therefore, the concrete added with the fly ash can obviously reduce the hydration heat generated in the early stage and obviously improve the early strength, the durability of the concrete including frost resistance, impermeability, corrosion resistance, carbonization resistance and the like of the concrete can be improved by adding the fly ash, and the construction cost can be reduced by selecting the concrete added with the fly ash because the fly ash can replace part of cement. The utility model discloses do not select traditional concrete bored concrete pile, but select the precast concrete tubular pile, its reason lies in precast concrete pile low in production cost, the arrangement of reinforcement rate is low, practice thrift steel, hollow pile accords with the environmental protection requirement, the little specific surface area of diameter is big, the bearing capacity of folk prescription concrete is very big, the construction is simple, the technical degree of difficulty is low, especially hollow pile's unique structure, the advantage that traditional concrete pile did not possess has been played at the in-process that weakens the vibration energy, and the row pile itself, the stability of the body soil body of shock insulation ditch body both sides has also been improved, the wholeness of row pile-the compound shock insulation system of shock insulation ditch has been strengthened, make it possess can be under construction and the function of exerting at arbitrary site conditions.

The utility model provides an ancient building shock insulation barrier, for row's stake-the compound isolation system of isolation ditch, compare in only using single isolation ditch or only using row's stake as the isolation measure that traditional isolation measure taken, the utility model discloses possess and weaken different frequencies, different forms's vibration to the harmful effects that is caused by the protection building, the effectual single isolation form of having avoided can not deal with the condition of various frequency vibration, when improving isolation protection performance, the utility model discloses construction cost has obtained the reduction, has promoted this compound isolation system's environmental suitability simultaneously, has avoided single isolation system to conflict with local soil body and other natural environment in the engineering practice process, possesses wide range of application.

Drawings

FIG. 1 is a schematic engineering drawing of the present invention;

fig. 2 is a plan view of the present invention.

Detailed Description

The specific engineering practices and features of the present invention will be further described below in conjunction with the drawings for the understanding of those skilled in the relevant arts:

as shown in fig. 1 and 2, the embodiment of the present invention is a pile-isolation trench composite isolation system, which specifically includes a trench isolation body 5 and two rows of coal ash concrete pipe piles outside the trench body as a seismic isolation pile-isolation row 3, wherein the trench body includes a U-shaped steel sheet pile 1 and a top crown beam and a top inner support arranged on the crown beam.

The concrete information of the shock insulation row pile 3, namely the fly ash concrete precast tubular pile is as follows: the external diameter is 400mm, the concrete strength C30, the main muscle diameter can adopt 12 ~ 22mm, the number is no less than 8, net protective layer should not be less than 20mm, the spiral reinforcement diameter can adopt 6 ~ 10mm, the interval is 50 ~ 200mm, in order to reach the influence that weakens low frequency vibration to being protected ancient building 6, more effective energy that reduces the long wave vibration and bring, plan to set up fly ash reinforced concrete precast tubular pile stake length 7-15m in this example, according to the condition of difference, can suitably adjust precast tubular pile stake length. The concrete construction of tubular pile adopts the static method, need drop to the scope that the standard allows with ground water level before the construction, should make water-proof measurements after the construction is accomplished, should lay apron and waterproofing membrane at the pile bolck after the pile sinking, prevent that groundwater and the water seepage flow that comes from the earth's surface from getting into pile body and shock insulation ditch body 5 inside, cause harmful effects to this novel vibration isolation ability of use. During construction of the pile body, intensive arrangement is adopted, horizontal and longitudinal intervals of the pile body are the same and are all 1m-2.0m, small-amplitude adjustment can be carried out according to the field condition, the distance between the inner-layer row pile and the shock insulation groove body is 1.5m-2.0m, and compared with a common cast-in-place pile, the concrete precast tubular pile is adopted, so that the consumption of materials is reduced, the construction progress is accelerated, the propagation of vibration energy is better weakened, a certain supporting effect can be achieved on the shock insulation groove body 5, and the number of internal supports is reduced.

The U-shaped steel sheet piles 1 are arranged in the isolation trench body 5, the depth of the U-shaped steel sheet piles 1 driven into a soil body is not less than 0.1 time of the excavation depth of the isolation trench body 5, a circle of top beams are arranged on the tops of the U-shaped steel sheet piles 1, top supporting cross beams 2 are arranged by taking the top beams as nodes, the horizontal distance between the top supporting cross beams 2 is 2m-3m, the U-shaped steel sheet piles 1 are combined into a whole by the top supporting cross beams 2 and the top beams, and the bearing capacity of the supporting and enclosing structure is effectively improved.

The foam concrete blocks 4 are filled in the shock insulation groove body 5, have good absorption and dispersion effects on shock waves, and can further improve the shock insulation effect of a shock insulation system.

The specific construction process of the embodiment is as follows:

(1) quality inspection is carried out on members and materials such as the incoming seismic isolation row piles 3, and the concrete of the seismic isolation row piles 3 can be sunk after the design strength and the age (normal pressure maintenance is 28d, and autoclave maintenance is 1d) are achieved;

(2) according to the principle of densely arranging pile rows, positioning and paying off specific hole positions of the seismic isolation pile rows 3, after determining the positions of the seismic isolation pile rows 3, sinking the seismic isolation pile rows 3 by using a static method, and when a top-pressure pile machine is adopted, an elastic gasket is additionally arranged between a pile cap or a pile feeder and the pile; when the pile machine is held and pressed, the clamp in the clamping mechanism is required to avoid the joint closing positions on the two sides of the pile body; the verticality of the pile body is observed in the pile sinking process, and if the verticality deviation of the pile body exceeds 1%, the reason is found out and corrected; after the pile tip enters a hard soil layer, the method of forcibly returning the plate, such as moving a pile frame, is strictly forbidden to correct the position;

(3) after pile sinking is finished, starting excavation of the shock insulation trench body 5, wherein the depth of the U-shaped steel sheet pile 1 into the soil is certainly greater than the designed excavation depth of the shock insulation trench body 5 during excavation; when the excavation is carried out to 2.0m below the ground, the construction of the top supporting beam 2 is carried out, and the top supporting beam 2 is connected with the top crown beam by screws, so that the side wall of the trench body is prevented from collapsing during excavation;

(4) the foam concrete block 4 is filled into the interior of the shock insulation ditch body 5, and waterproof and drainage measures are taken for a shock insulation system, so that the situation that the shock insulation effect is reduced due to water inflow of the shock insulation system is avoided.

Claims (4)

1. The ancient building shock insulation barrier is characterized by comprising shock insulation groove bodies distributed around the ancient building, wherein two rows of shock insulation row piles are vertically and downwards driven into the outer sides of the shock insulation groove bodies, the shock insulation row piles are hollow pipe piles, the arrangement form of the shock insulation row piles is in intensive arrangement, and the aperture of each shock insulation row pile is smaller than the distance between adjacent shock insulation row piles; and foam concrete blocks are filled in the shock insulation groove body.

2. The ancient building shock insulation barrier of claim 1, wherein the shock insulation row piles adopt reinforced fly ash concrete precast tubular piles.

3. The ancient building shock insulation barrier of claim 1 or 2, wherein the distance between the shock insulation groove body and the ancient building to be protected is 2m-15m, the depth of the shock insulation groove body is 5m, and the width of the shock insulation groove body is 1.5 m.

4. The ancient building shock insulation barrier according to claim 3, wherein U-shaped steel sheet piles are arranged inside the shock insulation trench body, a circle of crown beams are arranged at the tops of the U-shaped steel sheet piles, top supporting cross beams are arranged by taking the crown beams as nodes, the horizontal distance between the top supporting cross beams is 2m-3m, and the U-shaped steel sheet piles are integrated by the top supporting cross beams and the top crown beams.

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