CN110056126A - A kind of reinforced composite beam of loss of weight - Google Patents
A kind of reinforced composite beam of loss of weight Download PDFInfo
- Publication number
- CN110056126A CN110056126A CN201910314842.7A CN201910314842A CN110056126A CN 110056126 A CN110056126 A CN 110056126A CN 201910314842 A CN201910314842 A CN 201910314842A CN 110056126 A CN110056126 A CN 110056126A
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- bend pipe
- rigid
- rigid bend
- steel reinforcement
- cage
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/065—Light-weight girders, e.g. with precast parts
- E04C5/0653—Light-weight girders, e.g. with precast parts with precast parts
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The present invention relates to composite beam fields, more particularly, to a kind of reinforced composite beam of loss of weight, including steel reinforcement cage, steel reinforcement cage includes upper cage and bottom of cage body, bottom of cage body is located in precast beam, and upper cage is located in Cast-in-situ Beam, and the first rigid bend pipe is embedded in the steel reinforcement cage, the wavy type in central axes of first rigid bend pipe, the wave crest and trough of the first rigid bend pipe are respectively directed to the opposite two sides of steel reinforcement cage.The present invention, which passes through, bears simultaneously offset pressure at wave crest and trough using rigid bend pipe, improves the compression strength of composite beam；Due to pouring concrete in-situ inside rigid bend pipe, the weight of precast beam is greatly reduced, facilitates transport and hoisting prefabricated beam；Pre-buried rigidity bend pipe, substantially reduces the concrete amount of precast beam in precast beam, and concrete formation speed is accelerated, and the speed of production of precast beam is improved；China's output of steel is big, and the steel market price for making rigid bend pipe is low compared with concrete, therefore reduces the production cost of precast beam.
Description
Technical field
The present invention relates to composite beam fields, more particularly, to a kind of reinforced composite beam of loss of weight.
Background technique
Composite beam is the beam of disturbing concrete in two times, is made into precast beam in precasting yard for the first time, and second existing in construction
Field carries out, and after the completion of precast beam lifting is placed, then pours the concrete formation Cast-in-situ Beam for smashing top, connects precast beam with Cast-in-situ Beam
It is integral.
Composite beam uses superposed type component, and the weight that can mitigate mounting structure is more convenient for lifting, simultaneously because pouring after having
The presence of concrete, the globality of structure are also relatively preferable.The weak link of composite beam is mainly poured with after in prefabricated components mixed
On the faying face of solidifying soil between the two.Therefore, in order to ensure that the firm connection at the position, when construction, requires the superposed surfaces using concave-convex
Natural rough surface not less than 6mm, and subsequent concrete can be poured after must rinsing well, at the same also by precast beam and
The stirrup of partition all protrudes into overlapping layers.By these construction measures, the stability and security of overlapping girder construction entirety ensure that.
Authorization Notice No. is that the utility model patent of CN208056461U discloses a kind of precast concrete composite beam, is overlapped
Beam both ends are embedded with reinforcing bar connector, and reinforcing bar connector one end is embedded in composite beam in advance, and the other end is located at outside composite beam, and reinforcing bar connects
The part that fitting exposes composite beam offers bolt hole, when installing precast concrete composite beam at the construction field (site), by pre-buried reinforcing bar
Connector is attached with corresponding connector on steel column or reinforced concrete column by high-strength bolt.Although above-mentioned reinforcing bar connector mentions
The high bonding strength of composite beam and reinforced concrete column, but the structural strength of composite beam such as compression strength itself has no promotion, and now
In construction work, the compression strength of composite beam is required higher and higher.
Summary of the invention
The object of the present invention is to provide a kind of reinforced composite beams of loss of weight, have the effect for improving composite beam compression strength
Fruit.
Foregoing invention purpose of the invention has the technical scheme that a kind of reinforced overlapping of loss of weight
Beam, the steel reinforcement cage including surrounding cuboid, steel reinforcement cage include upper cage and bottom of cage body, and bottom of cage body is located in precast beam, upper cage
In Cast-in-situ Beam, it is embedded with the first rigid bend pipe in the steel reinforcement cage, the wavy type in central axes of the first rigid bend pipe, the
The wave crest and trough of one rigid bend pipe are respectively directed to the opposite two sides of steel reinforcement cage.
The first rigid bend pipe is utilized by the pre-buried first rigid bend pipe in composite beam by using above-mentioned technical proposal
Wave crest and trough at bear pressure, be transferred to pressure on the entire first rigid bend pipe, to reduce at wave crest and trough
Pressure, and the wave line style special shape of the first rigid bend pipe can bear larger pressure and (be received at adjacent peaks and trough
Pressure can cancel out each other), therefore the Reinforced Concrete Composite Beams of the pre-buried first rigid bend pipe are more folded than common armored concrete
Closing beam has higher compression strength.
Preferably, several annular support members are equipped in the described first rigid bend pipe, several annular support members are along the first rigidity
The length direction of bend pipe is arranged, and the central axes of the first rigid bend pipe are perpendicular to annular support member.
By using above-mentioned technical proposal, reinforces the first rigid bend pipe using annular support member, make the first rigid bend pipe not
The concrete compressive strain being easily retracted.
Preferably, the described first rigid bend pipe is equipped with several through-holes.
By using above-mentioned technical proposal, through-hole makes to be interlinked to the outside in the first rigid bend pipe, the coagulation outside the first rigid bend pipe
Soil can enter when shrinking in the first rigid bend pipe, to reduce the pressure of the first rigid bend pipe of concrete shrinkage pair.
Preferably, the central axes of the described first rigid bend pipe are in SIN function waveform shape.
By using above-mentioned technical proposal, in SIN function waveform the first rigid bend pipe wave crest to prolonging at trough naturally
It stretches, is conducive to the whole body of conducting pressure to the first rigid bend pipe.
Preferably, the central axes between the adjacent trough of the described first rigid bend pipe are in semicircular arc, in the first rigid bend pipe
The junction of adjacent two sections of semicircle camber lines of axis is tangent.
By using above-mentioned technical proposal, the first rigid bend pipe is that several semicircle bend pipes are tangentially formed by connecting, the knot
The rigid bend pipe of the first of configuration shape can not only keep good bearing capacity, also have the advantages that facilitate production and processing.
Preferably, several row's frameworks are equipped in the steel reinforcement cage, the reinforcing bar for separating two rows of frameworks is in a vertical shape, every row's framework
Inside it is equipped with the first rigid bend pipe.
By using above-mentioned technical proposal, multiple rows of framework can make the adjacent first rigid bend pipe non-interference, and multiple rows of frame
The intensity of composite beam reinforced concrete structure can be improved in body.
Preferably, the described first rigid bend pipe is set in bottom of cage body, and the second rigid bend pipe, the second rigidity are equipped in upper cage
The shape and structure of bend pipe are identical as the first rigid bend pipe；Plane where the central axes of first rigid bend pipe, with the second rigidity
Plane where the central axes of bend pipe is vertical.
By using above-mentioned technical proposal, is born using the first rigid bend pipe and to offset composite beam on vertical direction opposite
The pressure that two sides are born bears what the two sides that composite beam is opposite on simultaneously offset by the level of direction were born using the second rigid bend pipe
Pressure.
Preferably, the third rigidity bend pipe in semicircle elbow-shaped is additionally provided in the steel reinforcement cage, third rigidity bend pipe is located at
Below first rigid bend pipe, third rigidity bend pipe center and its end are respectively directed to the opposite two sides of steel reinforcement cage, and third is rigid
Property bend pipe center and end be butted on reinforcing bar；Plane where the central axes of third rigidity bend pipe, with the first rigid bend pipe
Central axes where plane it is vertical.
By using above-mentioned technical proposal, it is arranged semicircular the using the first rigid bend pipe lower space in steel reinforcement cage
Three rigid bend pipes, improve the performance that composite beam bears pressure in horizontal direction.
In conclusion advantageous effects of the invention are as follows:
1. improving the compression strength of composite beam by bearing simultaneously offset pressure at the wave crest and trough using rigid bend pipe；
2. greatly reduce the weight of precast beam due to pouring concrete in-situ inside rigid bend pipe, facilitate transport and
Hoisting prefabricated beam；
3. pre-buried rigidity bend pipe, substantially reduces the concrete amount of precast beam in precast beam, concrete formation speed is accelerated,
Improve the speed of production of precast beam；
4. China's output of steel is big, the steel market price for making rigid bend pipe is low compared with concrete, therefore reduces being produced into for precast beam
This.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the reinforced composite beam of loss of weight hides after precast beam and Cast-in-situ Beam in embodiment 1；
Fig. 2 is that Fig. 1 shows the structural schematic diagram after precast beam；
Fig. 3 is that Fig. 1 shows the structural schematic diagram after precast beam and Cast-in-situ Beam；
Fig. 4 is the structural schematic diagram of the first rigid bend pipe in embodiment 2；
Fig. 5 is the structural schematic diagram of the first rigid bend pipe in embodiment 3；
Fig. 6 is the front view that the reinforced composite beam of loss of weight hides after precast beam and Cast-in-situ Beam in embodiment 4；
Fig. 7 is the top view of Fig. 6；
Fig. 8 is the perspective view that the reinforced composite beam of loss of weight hides after precast beam and Cast-in-situ Beam in embodiment 5.
In figure, the 1, first rigid bend pipe；2, the second rigid bend pipe；3, third rigidity bend pipe；4, steel reinforcement cage；41, outer ring steel
Muscle；42, inner ring reinforcing bar；4a, upper cage；4b, bottom of cage body；4c, framework；5, annular support member；6, through-hole；7, reinforcing bar；8, prefabricated
Beam；9, Cast-in-situ Beam；10, stirrup.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Embodiment 1: Fig. 1 is a kind of reinforced composite beam of loss of weight disclosed by the invention, the steel reinforcement cage including surrounding cuboid
4, steel reinforcement cage 4 is by horizontally disposed four reinforcing bars 7 of top layer, horizontally disposed two reinforcing bars 7 in middle layer, bottom horizontally disposed four
Reinforcing bar 7, connect two reinforcing bars 7 in middle layer stirrup 10, surround steel reinforcement cage 4 outer ring reinforcing bar 41, in outer ring reinforcing bar 41 in
Reinforcing bar 42 is enclosed to form.Several outer ring reinforcing bars 41 are equally spaced along the length direction of steel reinforcement cage 4, are all provided in each outer ring reinforcing bar 41
There is an inner ring reinforcing bar 42.Outer ring reinforcing bar 41 is separated into three row framework 4c, framework 4c and is equipped with the first rigidity by inner ring reinforcing bar 42
Bend pipe 1, the first rigid bend pipe 1 are arranged along the length direction of steel reinforcement cage 4.
As shown in Figure 1, settable 1-3 first rigid bend pipe 1 in steel reinforcement cage 4, when 1 first rigid bend pipe 1 is only set,
First rigid bend pipe 1 is set in the framework 4c in center；When the rigid bend pipe 1 of setting 2 first, during 2 first rigid bend pipes 1 are set to
In two framework 4c for entreating the two sides framework 4c；When 3 first rigid bend pipes 1 of setting, one first is respectively provided in each framework 4c
Rigid bend pipe 1.Steel reinforcement cage 4 is separated into upper cage 4a and bottom of cage body 4b by stirrup 10, after bottom of cage body 4b pours into concrete, concrete
Surround bottom of cage body 4b and form precast beam 8(and see Fig. 2), upper cage 4a is then used to construction site and pours into Cast-in-situ Beam 9(see Fig. 3).
It as shown in Figure 1, the central axes of the first rigid bend pipe 1 are located in perpendicular, and is in wave line style, the first rigidity is curved
The wave crest and trough of pipe 1 are respectively directed to the opposite bottom surface and top surface of steel reinforcement cage 4.Several rings are welded and fixed in first rigid bend pipe 1
Shape supporting element 5, annular support member 5 are specially annular channel steel, several annular support members 5 along the first rigid bend pipe 1 length side
To being uniformly arranged, and the central axes of the first rigid bend pipe 1 are perpendicular to annular support member 5.Annular support member 5 can reinforce the first rigidity
Bend pipe 1, when pouring into the concrete shrinkage of precast beam 8, the first rigid bend pipe 1 is not easy to be depressed into deformation.First rigid bend pipe 1
Several through-holes 6 are additionally provided on outer wall, through-hole 6 makes to be interlinked to the outside in the first rigid bend pipe 1, and the concrete outside the first rigid bend pipe 1 is received
It can enter in the first rigid bend pipe 1 when contracting, to reduce concrete shrinkage to the pressure of the first rigid bend pipe 1.
The implementation principle of the present embodiment are as follows: by the pre-buried first rigid bend pipe 1 in composite beam, utilize the first rigid bend pipe
Pressure is born at 1 wave crest and trough, is transferred to pressure on the entire first rigid bend pipe 1, to reduce at wave crest and trough
Pressure, and the wave line style special shape of the first rigid bend pipe 1 can bear larger pressure (at adjacent peaks and trough institute by
Pressure can cancel out each other), therefore the Reinforced Concrete Composite Beams of the pre-buried first rigid bend pipe 1 are than common armored concrete
Composite beam has higher compression strength.
Due to pouring concrete in-situ inside rigid bend pipe, the weight of precast beam 8 is greatly reduced, transport is facilitated
With hoisting prefabricated beam 8.Pre-buried rigidity bend pipe, substantially reduces the concrete amount of precast beam 8, concrete formation in precast beam 8
Speed is accelerated, and the speed of production of precast beam 8 is improved.China's output of steel is big, makes the steel market price of rigid bend pipe compared with concrete
It is low, therefore reduce the production cost of precast beam 8.
Embodiment 2: a kind of reinforced composite beam of loss of weight, as shown in figure 4, on the basis of embodiment 1, by wave line style
First rigid bend pipe 1 is optimized for SIN function waveform shape, i.e., the central axes of the first rigid bend pipe 1 are in SIN function waveform shape
Shape.In SIN function waveform the first rigid bend pipe 1 wave crest to extending at trough naturally, be conducive to conducting pressure to first rigid
The whole body of property bend pipe 1.
Embodiment 3: a kind of reinforced composite beam of loss of weight, as shown in figure 5, on the basis of embodiment 1, by wave line style
First rigid bend pipe 1 is optimized for the end to end shape of several semicircle bend pipes, i.e., two adjacent waves of the first rigid bend pipe 1
The junction of central axes semicircular in shape shape between paddy/two adjacent peaks, two adjacent semicircle bend pipe central axes is tangent.It should
The rigid bend pipe 1 of the first of planform can not only keep good bearing capacity, also have the advantages that facilitate production and processing.
Embodiment 4: a kind of reinforced composite beam of loss of weight, as shown in Figure 6, Figure 7, on the basis of embodiment 1, just by first
Property bend pipe 1 be set in bottom of cage body 4b, the second rigid bend pipe 2, the shape and structure of the second rigid bend pipe 2 are set in upper cage 4a
It is identical as the first rigid bend pipe 1, several annular support members 5 are also welded in the second rigid bend pipe 2.In first rigid bend pipe 1
Axis in vertical plane, the central axes of the second rigid bend pipe 2 in the horizontal plane, the wave crest and wave of the second 2 central axes of rigid bend pipe
Paddy is respectively directed to the opposite two sides of composite beam.It is born using the first rigid bend pipe 1 and to offset composite beam on vertical direction opposite
The pressure born of two sides, born using the second rigid bend pipe 2 and the opposite two sides of composite beam held on offset by the level of direction
The pressure received.
Embodiment 5: a kind of reinforced composite beam of loss of weight, as shown in figure 8, on the basis of embodiment 1, in steel reinforcement cage 4
The third rigidity bend pipe 3 of semicircle bend pipe shape is set, and third rigidity bend pipe 3 is located at the first rigid 1 lower section of bend pipe, and third is rigidly curved
The central axes of pipe 3 are located in horizontal plane, and the center and its end of third rigidity bend pipe 3 are respectively directed to the opposite two sides of steel reinforcement cage 4
Face, and the center of third rigidity bend pipe 3 and end are butted on outer ring reinforcing bar 41.Utilize the first rigid bend pipe 1 in steel reinforcement cage 4
Semicircular third rigidity bend pipe 3 is arranged in lower space, improves the performance that composite beam bears pressure in horizontal direction.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of reinforced composite beam of loss of weight, the steel reinforcement cage (4) including surrounding cuboid, steel reinforcement cage (4) includes upper cage (4a)
With bottom of cage body (4b), bottom of cage body (4b) is located in precast beam (8), and upper cage (4a) is located in Cast-in-situ Beam (9), it is characterised in that:
The first rigid bend pipe (1) is embedded in the steel reinforcement cage (4), the wavy type in central axes of the first rigid bend pipe (1), first just
The wave crest and trough of property bend pipe (1) are respectively directed to the opposite two sides of steel reinforcement cage (4).
2. the reinforced composite beam of a kind of loss of weight according to claim 1, it is characterised in that: the described first rigid bend pipe (1)
Interior to be equipped with several annular support members (5), several annular support members (5) are arranged along the length direction of the first rigid bend pipe (1), and first
The central axes of rigid bend pipe (1) are perpendicular to annular support member (5).
3. the reinforced composite beam of a kind of loss of weight according to claim 1, it is characterised in that: the described first rigid bend pipe (1)
It is equipped with several through-holes (6).
4. the reinforced composite beam of a kind of loss of weight according to claim 1, it is characterised in that: the described first rigid bend pipe (1)
Central axes be in SIN function waveform shape.
5. the reinforced composite beam of a kind of loss of weight according to claim 1, it is characterised in that: the described first rigid bend pipe (1)
Central axes between adjacent trough are in semicircular arc, the connection of adjacent two sections of semicircle camber lines of first rigid bend pipe (1) central axes
Locate tangent.
6. the reinforced composite beam of a kind of loss of weight according to claim 1, it is characterised in that: be equipped in the steel reinforcement cage (4)
Several row's frameworks (4c), the reinforcing bar (7) for separating two rows of frameworks (4c) is in a vertical shape, and the first rigidity is equipped in every row's framework (4c)
Bend pipe (1).
7. the reinforced composite beam of a kind of loss of weight according to claim 1, it is characterised in that: the described first rigid bend pipe (1)
The second rigid bend pipe (2), the shape and structure of the second rigid bend pipe (2) are equipped in bottom of cage body (4b), in upper cage (4a)
It is identical as first rigid bend pipe (1)；In plane where the central axes of first rigid bend pipe (1), with the second rigid bend pipe (2)
Plane where axis is vertical.
8. the reinforced composite beam of a kind of loss of weight according to claim 1, it is characterised in that: also set in the steel reinforcement cage (4)
There is the third rigidity bend pipe (3) in semicircle elbow-shaped, third rigidity bend pipe (3) is located at below the first rigid bend pipe (1), and third is rigid
Property bend pipe (3) center and its end be respectively directed to the opposite two sides of steel reinforcement cage (4), and the center of third rigidity bend pipe (3) and
End is butted on reinforcing bar (7)；Plane where the central axes of third rigidity bend pipe (3), the axis with the first rigid bend pipe (1)
Plane where line is vertical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910314842.7A CN110056126B (en) | 2019-04-18 | 2019-04-18 | Weight-reducing reinforced composite beam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910314842.7A CN110056126B (en) | 2019-04-18 | 2019-04-18 | Weight-reducing reinforced composite beam |
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| CN110056126A true CN110056126A (en) | 2019-07-26 |
| CN110056126B CN110056126B (en) | 2021-06-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111041967A (en) * | 2019-12-25 | 2020-04-21 | 东南大学 | Steel-concrete composite beam containing corrugated connecting piece and implementation method thereof |
| CN111794438A (en) * | 2020-07-10 | 2020-10-20 | 无锡市亨利富建设发展有限公司 | Weight-reducing reinforced composite beam |
| CN114562070A (en) * | 2022-03-19 | 2022-05-31 | 池州建投鼎晟预制构件有限公司 | Anti bearing capacity structure of prestressed concrete roof beam |
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| CN1900465A (en) * | 2005-10-11 | 2007-01-24 | 刘思谋 | Prestress hole path pressure grouting construction process by post-tensioning method |
| CN102635067A (en) * | 2012-05-15 | 2012-08-15 | 江苏赛特钢结构有限公司 | Combined beam plate structure based on U-shaped channel steel |
| CN202416618U (en) * | 2011-10-28 | 2012-09-05 | 母涛 | Shockproof cross beam |
| CN104110097A (en) * | 2014-06-30 | 2014-10-22 | 湖北弘毅建设有限公司 | End-enhanced steel-reinforced concrete superposed beam |
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| JPH0325142A (en) * | 1989-06-20 | 1991-02-01 | Kawasaki Steel Corp | Tendon for reinforcing steel girder and steel girder |
| CN1900465A (en) * | 2005-10-11 | 2007-01-24 | 刘思谋 | Prestress hole path pressure grouting construction process by post-tensioning method |
| CN202416618U (en) * | 2011-10-28 | 2012-09-05 | 母涛 | Shockproof cross beam |
| CN102635067A (en) * | 2012-05-15 | 2012-08-15 | 江苏赛特钢结构有限公司 | Combined beam plate structure based on U-shaped channel steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111041967A (en) * | 2019-12-25 | 2020-04-21 | 东南大学 | Steel-concrete composite beam containing corrugated connecting piece and implementation method thereof |
| CN111041967B (en) * | 2019-12-25 | 2021-05-28 | 东南大学 | Steel-concrete composite beam containing corrugated connecting piece and implementation method thereof |
| CN111794438A (en) * | 2020-07-10 | 2020-10-20 | 无锡市亨利富建设发展有限公司 | Weight-reducing reinforced composite beam |
| CN111794438B (en) * | 2020-07-10 | 2021-03-23 | 无锡市亨利富建设发展有限公司 | Weight-reducing reinforced composite beam |
| CN114562070A (en) * | 2022-03-19 | 2022-05-31 | 池州建投鼎晟预制构件有限公司 | Anti bearing capacity structure of prestressed concrete roof beam |
| CN114562070B (en) * | 2022-03-19 | 2023-08-08 | 池州建投鼎晟预制构件有限公司 | Bearing capacity resistant structure of prestressed concrete beam |
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| CN110056126B (en) | 2021-06-22 |
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