CN103628496A - Egg-shaped digestion tank and construction method of vertical prestressed tendons at bottom of egg-shaped digestion tank - Google Patents
Egg-shaped digestion tank and construction method of vertical prestressed tendons at bottom of egg-shaped digestion tank Download PDFInfo
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- CN103628496A CN103628496A CN201310613621.2A CN201310613621A CN103628496A CN 103628496 A CN103628496 A CN 103628496A CN 201310613621 A CN201310613621 A CN 201310613621A CN 103628496 A CN103628496 A CN 103628496A
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Abstract
The invention provides an egg-shaped digestion tank and a construction method of vertical prestressed tendons at the bottom of the egg-shaped digestion tank, and relates to the technical field of processing of waste water or sludge. When an existing egg-shaped digestion tank without a reinforcing structure at the bottom is built on a soft foundation, crack, settlement and other quality damage will occur. The egg-shaped digestion tank comprises a first digestion tank shell and a second digestion tank shell arranged on the ground, wherein the first digestion tank shell is arranged underground; the lower portion of the first digestion tank shell is provided with a bearing platform, and the vertical prestressed tendons are arranged in the first digestion tank shell; the lower portion of the bearing platform is in a frustum shape and provided with a round bearing platform bottom surface, the vertical prestressed tendons are arranged in the first digestion tank shell in a radial shape, the top ends of the vertical prestressed tendons are fixed on the side wall of the bearing platform, and the bottom ends of the vertical prestressed tendons are fixed on the bearing platform bottom surface. The construction method comprises the steps that firstly, the area of the cross section of each vertical prestressed tendon required by the first digestion tank shell is calculated, and the number of the prestressed tendons is determined; secondly, the vertical prestressed tendons are arranged in the first digestion tank shell in the radial shape, and the two ends of each vertical prestressed tendon are fixed on the bearing platform bottom surface and the side wall respectively.
Description
Technical field
The present invention relates to waste water or technical field of sludge treatment, particularly a kind of bottom is provided with the egg shaped digestion cell of vertical prestressing bar, and the construction method of this vertical prestressing bar.
Background technology
Egg shaped digestion cell is a kind of large-scale water treatment building, has hyperboloid Rotation Shell Structure, and the capacity of being particularly suitable for is greater than 10000m
3large-scale digester, have that pond body stress performance is good, sludge agitation fully, the outstanding advantages such as high insulating effect.
Refer to Fig. 1, Chinese invention patent application number 03141718.3, name is called in the technical scheme of a kind of oval digestion tank and construction method thereof, the oval digestion tank locating below ground level (being below all referred to as egg shaped digestion cell 11) housing is connected with ring beam 12, the diaphragm wall of ring beam 12 belows surrounds the bottom of a pan morph concrete loose tool 13, diaphragm wall is as basis and the bracing of foundation pit of semi-underground type egg shaped digestion cell 11, accepted the load of the egg shaped digestion cell 11 being transmitted by ring beam 12, improved integrally-built anti-seismic performance, the egg shaped digestion cell 11 concrete consumptions in bottom have been reduced, but the egg shaped digestion cell of this technical scheme is the structure that are applicable on rock foundation, because of rock foundation supporting capacity higher, in element concrete loose tool 13, without being set, presstressed reinforcing steel also can bear the load of egg shaped digestion cell 11.
Yet the domestic rivers and lakes of China are numerous, the distribution of weak soil is extremely extensive, as built above-mentioned egg shaped digestion cell on soft foundation, because soft foundation supporting capacity is poor, if do not taked special reinforcement measure, egg shaped digestion cell there will be the quality harm such as cracking, depression.And in prior art all less than the description of the technical scheme of reinforcing about egg shaped digestion cell bottom, visible, design a kind of construction method that is applicable to egg shaped digestion cell on soft foundation and bottom ruggedized construction thereof and be necessity very.
Summary of the invention
Egg shaped digestion cell for existing bottom without ruggedized construction, be built in the problem that there will be the quality harm such as cracking, depression on soft foundation, the construction method that the object of this invention is to provide a kind of egg shaped digestion cell and bottom vertical prestressing bar thereof, can be built on soft foundation and structural safety, stable.
The technical solution adopted for the present invention to solve the technical problems is: the digester housing one locating below ground level; Be positioned at digester housing two more than ground; The bottom of described digester housing one is provided with cushion cap, and described cushion cap is provided with at least one circumferential step; In described digester housing one, be provided with some vertical prestressing bars; Wherein, the bottom of described cushion cap is taper type and has a circular cushion cap bottom surface, described vertical prestressing bar is radial and is arranged in described digester housing one, the top of described vertical prestressing bar is fixed on the sidewall on close described ground of described cushion cap, and described cushion cap bottom surface is fixed in the bottom of described vertical prestressing bar.
Further, described cushion cap bottom surface is followed successively by the first anchorage zone and the second anchorage zone from inside to outside along the longitudinal axis of described egg shaped digestion cell, described the first anchorage zone and the second anchorage zone are that the center of circle is positioned at the concentric circles on described longitudinal axis, described vertical prestressing bar is that even number root and two adjacent described vertical prestressing bars are one group, each group has odd term vertical prestressing bar and even item vertical prestressing bar, the bottom of described odd term vertical prestressing bar is fixed on the circumference of described the first anchorage zone, the bottom of described even item vertical prestressing bar is fixed on the circumference of described the second anchorage zone, or the bottom of odd term vertical prestressing bar is fixed on the circumference of described the second anchorage zone, the bottom of even item vertical prestressing bar is fixed on the circumference of described the first anchorage zone.
Preferably, in described the first anchorage zone, be also provided with the core ruggedized construction coaxial with described longitudinal axis, described core ruggedized construction by some vertical reinforcements be sheathed on the cylindrical frame that the reinforcing bar cuff on described vertical reinforcement forms, and build in concrete and form.
The outer wall of described odd term vertical prestressing bar and described core ruggedized construction one side is tangent and be fixed on the circumference of described the first anchorage zone, the outer wall of described even item presstressed reinforcing steel and described core ruggedized construction opposite side is tangent and be fixed on the circumference of described the second anchorage zone, or the outer wall of described odd term vertical prestressing bar and described core ruggedized construction one side is tangent and be fixed on the circumference of described the second anchorage zone, the outer wall of described even item presstressed reinforcing steel and described core ruggedized construction opposite side is tangent and be fixed on the circumference of described the first anchorage zone.
Described odd term vertical prestressing bar and described even item vertical prestressing bar are arranged in a crossed manner, and at the symmetrical net structure of the interior formation of digester housing one.
The radius of described core ruggedized construction is greater than 400mm.
The radius of described the first anchorage zone is greater than 900mm, and described the second anchorage zone is 150mm～300mm apart from the distance B at the edge of described cushion cap bottom surface.
In addition, the present invention also provides the construction method of a kind of egg shaped digestion cell bottom vertical prestressing bar, comprises the steps:
Step 1: calculate the cross-sectional area of described digester housing one interior required vertical prestressing bar, and determine the quantity of described vertical prestressing bar according to the span of described cross-sectional area;
Step 2: described vertical prestressing bar is to radial and is arranged in described digester housing one, the two ends of described vertical prestressing bar are separately fixed on the sidewall of described cushion cap bottom surface and described cushion cap.
Further, in described step 1, the cross-sectional area of the described vertical prestressing bar in described digester housing one calculates by following formula:
S≥（G1+G2）/（μ×σcon×cosθ）
Wherein, G1 is the weight of described egg shaped digestion cell cylindrical liquid, the N of unit;
G2 is the weight that is positioned at the frustum shell under described column liquid, the N of unit;
μ is the loss coefficient of described vertical prestressing bar;
σ con is the control stress for prestressing of described vertical prestressing bar, the N/mm of unit
2;
θ is the angle of described vertical prestressing bar and described egg shaped digestion cell longitudinal axis.
Further, described step 2 comprises the steps:
Step 201: the longitudinal axis along described egg shaped digestion cell on described cushion cap bottom surface marks off the first anchorage zone and the second anchorage zone from inside to outside successively, described the first anchorage zone and the second anchorage zone are that the center of circle is positioned at the concentric circles on described longitudinal axis;
Step 202: by vertical prestressing bar described in even number root adjacent two be divided into one group, in each group, there is an odd term vertical prestressing bar and an even item vertical prestressing bar;
Step 203: the bottom of described odd term vertical prestressing bar is fixed on the circumference of described the first anchorage zone, the bottom of described even item vertical prestressing bar is fixed on the circumference of described the second anchorage zone, or the bottom of described odd term vertical prestressing bar is fixed on the circumference of described the second anchorage zone, and the bottom of described even item vertical prestressing bar is fixed on the circumference of described the first anchorage zone.
Further, described step 2 comprises the steps:
Step 211: the longitudinal axis along described egg shaped digestion cell on described cushion cap bottom surface is divided and had core ruggedized construction, the first anchorage zone and the second anchorage zone successively from inside to outside, described core ruggedized construction is the column structure coaxial with described longitudinal axis, and described the first anchorage zone and the second anchorage zone are that the center of circle is positioned at the concentric circles on described longitudinal axis;
Step 212: by vertical prestressing bar described in even number root adjacent two be divided into one group, in each group, there is an odd term vertical prestressing bar and an even item vertical prestressing bar;
Step 213: after the outer wall of the bottom of described odd term vertical prestressing bar and described core ruggedized construction one side is tangent, continue to extend to described cushion cap bottom surface and be fixed on the circumference of described the first anchorage zone, after the outer wall of described even item vertical prestressing bar and described core stabilization zone opposite side is tangent, continue to extend to described cushion cap bottom surface and be fixed on the circumference of described the second anchorage zone, or after the outer wall of the bottom of described odd term vertical prestressing bar and described core stabilization zone one side is tangent, continue to extend to described cushion cap bottom surface and be fixed on the circumference of described the second anchorage zone, after the outer wall of described even item vertical prestressing bar and described core stabilization zone opposite side is tangent, continue to extend to described cushion cap bottom surface and be fixed on the circumference of described the first anchorage zone.
Described odd term vertical prestressing bar and the described even item vertical prestressing bar of each group are arranged in a crossed manner, and described vertical prestressing bar is at the symmetrical net structure of the interior formation of described digester housing one.
Described core ruggedized construction is arranged on described cushion cap bottom surface, and described core ruggedized construction forms cylindrical frame by some vertical reinforcements and the reinforcing bar cuff that is sheathed on described vertical reinforcement, and builds in concrete and form.
The radius of described core ruggedized construction is greater than 400mm.
The radius of described the first anchorage zone is greater than 900mm, and described the second anchorage zone is 150mm～300mm apart from the distance B at the edge of described cushion cap bottom surface.
Effect of the present invention is:
One, in the digester housing one that the present invention is connected with cushion cap at egg shaped digestion cell, be provided with vertical prestressing bar, the two ends of vertical prestressing reinforcing bar are connected with cushion cap sidewall with cushion cap bottom surface respectively.When load action, the tensile stress that load produces can be offset or reduce to vertical prestressing bar, avoids egg shaped digestion cell to occur the quality harm such as cracking, depression, realized the design and construction of prestressed reinforced concrete egg shaped digestion cell on soft foundation.
Two, egg shaped digestion cell of the present invention, the top spacing of vertical prestressing bar is fixed on cushion cap sidewall equably, its bottom is stretched into cushion cap bottom surface and is not pointed to bottom center, but after tangent with the column structure external surface of core stabilization zone, continue extend to two anchorage zones with certain intervals of bottom surface and fix, be that vertical prestressing bar is around core stabilization zone and is certain radius r1 and arranges, this subregion cloth muscle method can be avoided the destruction to concrete component of causing because of digester pond base concrete stress raisers.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing egg shaped digestion cell;
Fig. 2 is the structural representation of egg shaped digestion cell of the present invention;
Fig. 3 is the force analysis figure of egg shaped digestion cell;
Fig. 4 is the force analysis figure of egg shaped digestion cell bottom;
Fig. 5 is the layout plan of vertical prestressing bar in egg shaped digestion cell.
The specific embodiment
Egg shaped digestion cell the present invention being proposed below in conjunction with the drawings and specific embodiments and the construction method of bottom vertical prestressing bar thereof are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the object of the aid illustration embodiment of the present invention lucidly.
Embodiment mono-: in conjunction with Fig. 2 to Fig. 5, egg shaped digestion cell 100 of the present invention is described, it comprises the digester housing 1 locating below ground level; Be positioned at digester housing 2 102 more than ground; The bottom of digester housing 1 is provided with cushion cap 110, and cushion cap 110 is provided with two ring-shaped steps 111, is provided with some vertical prestressing bars 140 in digester housing 1.The bottom of cushion cap 110 is taper type and has a circular cushion cap bottom surface 112, vertical prestressing bar 140 is radial and is arranged in digester housing 1, and one end of vertical prestressing bar 140 is fixed on cushion cap bottom surface 112, the other end of vertical prestressing bar 140 is fixed on the sidewall on close ground of cushion cap 110.The vertical prestressing bar 140 arranging in the concrete of digester housing 1, at load (egg shaped digestion cell and internal liquid thereof), do the used time, can offset or reduce the tensile stress that load produces, avoid egg shaped digestion cell 100 to occur the quality harm such as cracking, depression.
Further, as shown in Figure 2 and Figure 5, on cushion cap bottom surface 112, along the longitudinal axis ax of egg shaped digestion cell 100, be followed successively by from inside to outside the first anchorage zone 114 and 115, the first anchorage zones 114, the second anchorage zone and the second 115Wei center of circle, anchorage zone and be all positioned at the concentric circles on longitudinal axis ax.Because egg shaped digestion cell 100 is symmetrical structure, the total quantity of vertical prestressing bar 140 should be even number, as classified two adjacent vertical prestressing bars 140 as one group, in each group vertical prestressing bar 140, there is an odd term vertical prestressing bar 140a and an even item vertical prestressing bar 140b.The top spacing of vertical prestressing bar 140 is fixed on the sidewall of cushion cap 110 equably, and the bottom spacing of respectively organizing odd term vertical prestressing bar 140a is fixed on the circumference of the first anchorage zone 114 equably, each bottom spacing of organizing even item vertical prestressing bar 140b is fixed on the circumference of the second anchorage zone 115 equably, is so arranged in order into symmetrical structure.Otherwise or the bottom of odd term vertical prestressing bar 140a is fixed on the circumference of the second anchorage zone 115, the bottom of even item vertical prestressing bar 140b is fixed on the circumference of the first anchorage zone 114.The structure that this symmetry of vertical prestressing bar 140 and subregion are arranged can be avoided in the concrete of egg shaped digestion cell 100 bottoms, producing the concentrated phenomenon of stress, and then has reduced stress and concentrated the risk that causes component damage.
Embodiment bis-: in conjunction with Fig. 2 to Fig. 5, egg shaped digestion cell 100 of the present invention is described, different from embodiment mono-is, as better technical scheme, in the first anchorage zone 114, be also provided with the core ruggedized construction 113 coaxial with longitudinal axis ax, core ruggedized construction 113 is arranged on cushion cap bottom surface 112, it forms cylindrical frame by some vertical reinforcements and sheathed reinforcing bar cuff thereon, and builds in concrete and form.After the outer wall of odd term vertical prestressing bar 140a and core ruggedized construction 113 1 sides is tangent, continue to extend to cushion cap bottom surface 112 and be fixed on the circumference of the first anchorage zone 114, and the outer wall of even item vertical prestressing bar 140b and core ruggedized construction 113 opposite sides tangent after, continue to extend to cushion cap bottom surface 112 and be fixed on the circumference of the second anchorage zone 115.Vertical prestressing bar 140 is tangent with core ruggedized construction 113 outer walls, and core ruggedized construction 113 can be born the stretching force of part vertical prestressing bar 140, has alleviated the stressed burden of cushion cap 110 sidewalls and bottom surface, is conducive to the stable of digester structure.
Odd term vertical prestressing bar 140a and even item vertical prestressing bar 140b are arranged in a crossed manner, and therefore, vertical prestressing bar 140, at the symmetrical net structure of the interior formation of digester housing 1, has increased the concrete bearing capacity of digester housing 1.Similarly, if be fixed on after the outer wall of odd term vertical prestressing bar 140a and core ruggedized construction 113 is tangent on the circumference of the second anchorage zone 115, after the outer wall of even item vertical prestressing bar 140b and core ruggedized construction 113 is tangent, be fixed on the first anchorage zone 114 circumference, all can realize the technical scheme of the present embodiment.
In technique scheme, the radius r 1 of core ruggedized construction 113 is greater than 400mm, the radius r 2 of the first anchorage zone 114 is greater than 900mm, the radius of the first anchorage zone 114 is compared with the large 500mm of the radius of core ruggedized construction 113, the ground tackle of vertical prestressing bar 140 can be evenly arranged on the circumference of the first anchorage zone 114, and can be too unconcentrated.The second anchorage zone 115 is 150mm～300mm apart from the distance B at 112 edges, cushion cap bottom surface, can make another part vertical prestressing bar 140 be dispersed on its circumference, can not make again pond feather edge concrete damage because local pressure is excessive.
Embodiment tri-: the construction method that egg shaped digestion cell of the present invention bottom presstressed reinforcing steel is described in conjunction with Fig. 2 to Fig. 5, comprises the steps:
Step 1: calculate the cross-sectional area of required vertical prestressing bar 140 in digester housing 1, and determine the quantity of vertical prestressing bar 140 according to the span of cross-sectional area;
Step 2: vertical prestressing bar 140 is to radial and is arranged in digester housing 1, the two ends of vertical prestressing bar 140 are separately fixed on the sidewall of cushion cap bottom surface 112 and cushion cap 110.
The computational methods of the cross-sectional area of the vertical prestressing bar 140 in digester housing 1 are described in above-mentioned steps 1 further combined with Fig. 4 and Fig. 5:
Disregarding under the condition that egg shaped digestion cell 100 pond top gas press, the concrete-pool-wall (being the face of A-A shown in Fig. 4) of egg shaped digestion cell 100 of take be stress point, and the stretching force that N provides after for vertical prestressing bar 140 deduction losses with joint efforts; P is the tensile stress of concrete-pool-wall, G1 be in egg shaped digestion cell 100 cylindrical liquid 200(Fig. 3 in dotted line frame shown in) weight, G2 is the weight that is positioned at column liquid 200 below frustum shells 103 of digester housing 1.Because concrete component is prone to crack under tension state, in the present embodiment, for making concrete-pool-wall A-A face not bear tensile stress P, should meet: σ ck-σ pc≤0, this formula is recorded in the 2010 > > 7.1 Crack Control checking computations of < < Code for design of concrete structures.
Wherein, σ ck is under load standard combination, accurate permanent combination, the concrete normal stress at crack resisting calculation edge, the N/mm of unit
2;
After σ pc is the whole losss of prestress of deduction, at the concrete compressive pre-stress in crack resisting calculation edge, the N/mm of unit
2.
Can draw in the present embodiment thus: P-N≤0;
And P=(G1+G2)/cos θ;
N=S×μ×σcon；
Wherein: the tensile stress that P is concrete-pool-wall, the N of unit;
N deducts for vertical prestressing bar 140 pulling force providing after loss and makes a concerted effort, the N of unit;
G1 is the weight of egg shaped digestion cell 100 cylindrical liquid 200, the N of unit;
G2 is the weight of column liquid 200 below frustum shells 103, the N of unit;
S is the cross-sectional area of required vertical prestressing bar 140, the mm of unit
2;
μ is the loss coefficient of vertical prestressing bar 140;
σ con is the control stress for prestressing of vertical prestressing bar 140, the N/mm of unit
2, (control stress for prestressing refers to the maximum stress value that prestressed reinforcement reaches when carrying out stretch-draw, tensioning equipment namely, the stress value that total stretching force as indicated in the dynamometer on jack draws divided by prestressed reinforcement cross sectional area.）
In sum, further draw: S >=(G1+G2)/(μ * σ con * cos θ), is the span of the cross-sectional area of required vertical prestressing bar 140.Then, the quantity of determining vertical prestressing bar 140 according to the model of above-mentioned vertical prestressing bar 140 cross-sectional areas and the selected vertical prestressing bar 140 of constructing and specification.
How vertical prestressing bar 140 is reasonably arranged in digester housing 1, details are as follows for the concrete expansion of above-mentioned steps 2:
Step 201: the longitudinal axis ax along egg shaped digestion cell 100 on cushion cap bottom surface 112 marks off the first anchorage zone 114 and the second anchorage zone 115 from inside to outside successively, and the first anchorage zone 114 and the second 115Wei center of circle, anchorage zone are positioned at the concentric circles on longitudinal axis ax, on the circumference of the first anchorage zone 114 and the second anchorage zone 115, are embedded with equally distributed ground tackle;
Step 202: the top spacing of even number vertical prestressing bar 140 is fixed on the sidewall of cushion cap 110 equably, and two adjacent vertical prestressing bars 140 are divided into a group, in each group, respectively there are an odd term vertical prestressing bar 140a and an even item vertical prestressing bar 140b;
Step 203: the bottom of odd term vertical prestressing bar 140a is fixed on the ground tackle of the first anchorage zone 114, the bottom of even item vertical prestressing bar 140b is fixed on the ground tackle of the second anchorage zone 115, or the bottom of odd term vertical prestressing bar 140a is fixed on the ground tackle of the second anchorage zone 115, the bottom of even item vertical prestressing bar 140b is fixed on the ground tackle of the first anchorage zone 114.
As preferably, the radius r 2 of the first anchorage zone 114 is greater than 900mm, and the second anchorage zone 115 is 150mm～300mm apart from the distance B at 112 edges, cushion cap bottom surface.
Embodiment tetra-: the construction method of egg shaped digestion cell of the present invention bottom presstressed reinforcing steel is described in conjunction with Fig. 3 to Fig. 5, different from embodiment tri-:
The constructure scheme that above-mentioned steps 2 is more superior is as follows:
Step 211: the longitudinal axis ax along egg shaped digestion cell 100 on cushion cap bottom surface 112 marks off core stabilization zone 113, the first anchorage zone 114 and the second anchorage zone 115 from inside to outside successively, and core stabilization zone 113, the first anchorage zone 114 and the second 115Wei center of circle, anchorage zone are positioned at the concentric circles on longitudinal axis ax, on the circumference of the first anchorage zone 114 and the second anchorage zone 115, are embedded with equally distributed ground tackle;
Step 212: the top spacing of even number vertical prestressing bar 140 is fixed on the sidewall of cushion cap 110 equably, and two adjacent vertical prestressing bars 140 are divided into a group, there are an odd term vertical prestressing bar 140a and an even item vertical prestressing bar 140b in every group;
Step 213: after the outer wall of the bottom of odd term vertical prestressing bar 140a and core ruggedized construction 113 1 sides is tangent, continue to extend to cushion cap bottom surface 112 and be fixed on the ground tackle of the first anchorage zone 114 circumference, after the outer wall of even item vertical prestressing bar 140b and core ruggedized construction 113 opposite sides is tangent, continue to extend to cushion cap bottom surface 112 and be fixed on the ground tackle of the second anchorage zone 115 circumference, or contrary, link position transposing by odd term vertical prestressing bar 140a and even item vertical prestressing bar 140b bottom, also can realize technical scheme of the present invention.
Better, the vertical prestressing bar 140 that is individually fixed in the first anchorage zone 114 and the second anchorage zone 115 intersects to form symmetrical net structure.
Core ruggedized construction 113 is arranged on cushion cap bottom surface 112, and it forms cylindrical frame by some vertical muscle and sheathed lateral tie thereon, and builds in concrete and form.The radius r 1 of core ruggedized construction 113 is greater than 400mm.
The present invention be directed to the egg shaped digestion cell of Design of Soft Soil, in the situation that this egg shaped digestion cell cushion cap can meet arrangement of pile foundation, make the concrete structure form of cushion cap change into taper from traditional bulk, whole saving reinforcing bar and concrete consumption are about 5%.
In the digester housing one being connected with cushion cap at egg shaped digestion cell, be provided with vertical prestressing bar, the two ends of vertical prestressing reinforcing bar are connected with cushion cap sidewall with cushion cap bottom surface respectively.When load action, the tensile stress that load produces can be offset or reduce to vertical prestressing bar, avoids egg shaped digestion cell to occur the quality harm such as cracking, depression.Realized the design and construction of prestressed reinforced concrete egg shaped digestion cell on soft foundation.
Particularly importantly, the top spacing of vertical prestressing bar is fixed on cushion cap sidewall equably, its bottom is stretched into cushion cap bottom surface and is not pointed to bottom center, but after tangent with the external surface of core ruggedized construction, continue extend to two anchorage zones with certain intervals of bottom surface and fix, be that vertical prestressing bar is around core stabilization zone and is certain radius r1 and arranges, this subregion cloth muscle method can be avoided the destruction of the concrete component that causes because of digester pond base concrete stress raisers.
Foregoing description is only the description to preferred embodiment of the present invention, the not any restriction to the scope of the invention, and any change, modification that the those of ordinary skill in field of the present invention is done according to above-mentioned disclosure, all belong to the protection domain of claims.
Claims (15)
1. egg shaped digestion cell, is characterized in that, comprising:
The digester housing one locating below ground level;
Be positioned at digester housing two more than ground;
The bottom of described digester housing one is provided with cushion cap, and described cushion cap is provided with at least one circumferential step;
In described digester housing one, be provided with some vertical prestressing bars;
Wherein, the bottom of described cushion cap is taper type and has a circular cushion cap bottom surface, described vertical prestressing bar is radial and is arranged in described digester housing one, the top of described vertical prestressing bar is fixed on the sidewall on close described ground of described cushion cap, and described cushion cap bottom surface is fixed in the bottom of described vertical prestressing bar.
2. egg shaped digestion cell according to claim 1, it is characterized in that: described cushion cap bottom surface is followed successively by the first anchorage zone and the second anchorage zone from inside to outside along the longitudinal axis of described egg shaped digestion cell, described the first anchorage zone and the second anchorage zone are that the center of circle is positioned at the concentric circles on described longitudinal axis, described vertical prestressing bar is that even number root and two adjacent described vertical prestressing bars are one group, each group has odd term vertical prestressing bar and even item vertical prestressing bar, the bottom of described odd term vertical prestressing bar is fixed on the circumference of described the first anchorage zone, the bottom of described even item vertical prestressing bar is fixed on the circumference of described the second anchorage zone, or the bottom of odd term vertical prestressing bar is fixed on the circumference of described the second anchorage zone, the bottom of even item vertical prestressing bar is fixed on the circumference of described the first anchorage zone.
3. egg shaped digestion cell according to claim 2, it is characterized in that: in described the first anchorage zone, be also provided with the core ruggedized construction coaxial with described longitudinal axis, described core ruggedized construction by some vertical reinforcements be sheathed on the cylindrical frame that the reinforcing bar cuff on described vertical reinforcement forms, and build in concrete and form.
4. egg shaped digestion cell according to claim 3, it is characterized in that: the outer wall of described odd term vertical prestressing bar and described core ruggedized construction one side is tangent and be fixed on the circumference of described the first anchorage zone, the outer wall of described even item presstressed reinforcing steel and described core ruggedized construction opposite side is tangent and be fixed on the circumference of described the second anchorage zone, or the outer wall of described odd term vertical prestressing bar and described core ruggedized construction one side is tangent and be fixed on the circumference of described the second anchorage zone, the outer wall of described even item presstressed reinforcing steel and described core ruggedized construction opposite side is tangent and be fixed on the circumference of described the first anchorage zone.
5. according to the egg shaped digestion cell described in claim 2 to 4 any one, it is characterized in that: described odd term vertical prestressing bar and described even item vertical prestressing bar are arranged in a crossed manner, and at the symmetrical net structure of the interior formation of digester housing one.
6. according to the egg shaped digestion cell described in claim 3 or 4, it is characterized in that: the radius of described core ruggedized construction is greater than 400mm.
7. according to the egg shaped digestion cell described in claim 2 to 4 any one, it is characterized in that: the radius of described the first anchorage zone is greater than 900mm, described the second anchorage zone is 150mm～300mm apart from the distance B at the edge of described cushion cap bottom surface.
8. a construction method for the bottom of the egg shaped digestion cell described in claim 1 to 7 any one vertical prestressing bar, comprises the steps:
Step 1: calculate the cross-sectional area of described digester housing one interior required vertical prestressing bar, and determine the quantity of described vertical prestressing bar according to the span of described cross-sectional area;
Step 2: described vertical prestressing bar is to radial and is arranged in described digester housing one, the two ends of described vertical prestressing bar are separately fixed on the sidewall of described cushion cap bottom surface and described cushion cap.
9. construction method according to claim 8, is characterized in that: in described step 1, the cross-sectional area of the described vertical prestressing bar in described digester housing one calculates by following formula:
S≥（G1+G2）/（μ×σcon×cosθ）
Wherein, G1 is the weight of described egg shaped digestion cell cylindrical liquid, the N of unit;
G2 is the weight that is positioned at the frustum shell under described column liquid, the N of unit;
μ is the loss coefficient of described vertical prestressing bar;
σ con is the control stress for prestressing of described vertical prestressing bar, the N/mm of unit
2;
θ is the angle of described vertical prestressing bar and described egg shaped digestion cell longitudinal axis.
10. construction method according to claim 8, is characterized in that, described step 2 comprises the steps:
Step 201: the longitudinal axis along described egg shaped digestion cell on described cushion cap bottom surface marks off the first anchorage zone and the second anchorage zone from inside to outside successively, described the first anchorage zone and the second anchorage zone are that the center of circle is positioned at the concentric circles on described longitudinal axis;
Step 202: by vertical prestressing bar described in even number root adjacent two be divided into one group, in each group, there is an odd term vertical prestressing bar and an even item vertical prestressing bar;
Step 203: the bottom of described odd term vertical prestressing bar is fixed on the circumference of described the first anchorage zone, the bottom of described even item vertical prestressing bar is fixed on the circumference of described the second anchorage zone, or the bottom of described odd term vertical prestressing bar is fixed on the circumference of described the second anchorage zone, and the bottom of described even item vertical prestressing bar is fixed on the circumference of described the first anchorage zone.
11. construction methods according to claim 8, is characterized in that, described step 2 comprises the steps:
Step 211: the longitudinal axis along described egg shaped digestion cell on described cushion cap bottom surface is divided and had core ruggedized construction, the first anchorage zone and the second anchorage zone successively from inside to outside, described core ruggedized construction is the column structure coaxial with described longitudinal axis, and described the first anchorage zone and the second anchorage zone are that the center of circle is positioned at the concentric circles on described longitudinal axis;
Step 212: by vertical prestressing bar described in even number root adjacent two be divided into one group, in each group, there is an odd term vertical prestressing bar and an even item vertical prestressing bar;
Step 213: after the outer wall of the bottom of described odd term vertical prestressing bar and described core ruggedized construction one side is tangent, continue to extend to described cushion cap bottom surface and be fixed on the circumference of described the first anchorage zone, after the outer wall of described even item vertical prestressing bar and described core stabilization zone opposite side is tangent, continue to extend to described cushion cap bottom surface and be fixed on the circumference of described the second anchorage zone, or after the outer wall of the bottom of described odd term vertical prestressing bar and described core stabilization zone one side is tangent, continue to extend to described cushion cap bottom surface and be fixed on the circumference of described the second anchorage zone, after the outer wall of described even item vertical prestressing bar and described core stabilization zone opposite side is tangent, continue to extend to described cushion cap bottom surface and be fixed on the circumference of described the first anchorage zone.
12. according to the construction method described in claim 10 or 11, it is characterized in that: described odd term vertical prestressing bar and the described even item vertical prestressing bar of each group are arranged in a crossed manner, and described vertical prestressing bar is at the symmetrical net structure of the interior formation of described digester housing one.
13. construction methods according to claim 11, it is characterized in that: described core ruggedized construction is arranged on described cushion cap bottom surface, described core ruggedized construction forms cylindrical frame by some vertical reinforcements and the reinforcing bar cuff that is sheathed on described vertical reinforcement, and builds in concrete and form.
14. construction methods according to claim 13, is characterized in that: the radius of described core ruggedized construction is greater than 400mm.
15. according to the construction method described in claim 10 or 11, it is characterized in that: the radius of described the first anchorage zone is greater than 900mm, and described the second anchorage zone is 150mm～300mm apart from the distance B at the edge of described cushion cap bottom surface.
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