CN110042741A - A kind of casing constraint Precast Concrete Segmental Bridges pier stud and its construction method - Google Patents
A kind of casing constraint Precast Concrete Segmental Bridges pier stud and its construction method Download PDFInfo
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- CN110042741A CN110042741A CN201910184182.5A CN201910184182A CN110042741A CN 110042741 A CN110042741 A CN 110042741A CN 201910184182 A CN201910184182 A CN 201910184182A CN 110042741 A CN110042741 A CN 110042741A
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- pier stud
- reinforcing bar
- energy consumption
- casing
- prefabricated subsection
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a kind of casing constraint Precast Concrete Segmental Bridges pier stud and its construction methods, its elder generation reserves energy consumption reinforcing bar one on the basis of pier stud, consume energy reinforcing bar two and presstressed reinforcing steel, then by post-stress muscle quickly by bottom prefabricated subsection, standard prefabricated subsection and top prefabricated subsection connect to form assembled pier stud, confinement sleeve is installed additional in assembled pier stud periphery again, finally between confinement sleeve and assembled pier stud casting concrete to improve the globality of assembled pier stud, reaching solution wet connection, difficulty of construction is big, period is long, involvement connects globality poor, in cannot applying the problem of highly seismic region.
Description
Technical field
The present invention relates to technical field of bridge engineering, and in particular to a kind of casing constraint Precast Concrete Segmental Bridges pier stud and its
Construction method.
Background technique
With High-speed Railway Network, freeway net, urban and rural transportation net, the more great infrastructure construction such as river bridge spanning the sea
Continuous propulsion, it is even severe in face of urban transportation and the construction interference problem of environment, marine construction environment complicated and changeable
How water shortage or plateau severe cold environment guarantee that high quality, high efficiency and the ecology construction of bridge structure are that current urgent need solves
The problem of.
Precast assembly technology uses the quick green construction technology that element factory metaplasia produces and assembled in situization is constructed for solution
Certainly the above problem provides important effective way.If Precast Concrete Segmental Bridges pier stud also because being divided into along longitudinal direction using by pier shaft
Dry segment progress factory modularization is prefabricated, then prefabricated subsection progress mechanization assembly is formed whole construction in build on-site
Technology and have broad application prospects in bridge substructure.The connection type that Precast Concrete Segmental Bridges pier stud generallys use
There are wet connection and involvement to connect two kinds.Wet connection pier stud generally has the stress performance of equally cast-in-place pier stud, can be by cast-in-place concrete
The Specification Design of structure.But there are seam crossing scene reinforcing bars to connect contraposition difficulty for such connection, and difficulty of construction is big, seam crossing
A series of problems, such as template erects and concreting maintenance required time is long.Involvement connects pier stud because existing using by longitudinal reinforcement
Seam crossing disconnects, and prefabricated subsection, which is connected integral construction method, by live post-stress has efficiently construction
Performance and the good Self-resetting performance for being different from integral cast-in-situ column, but its seam crossing easily becomes the thin of antidetonation and life requirement
Weak link.Segment is connected to become one of the technical bottleneck of restricting current science of bridge building precast assembly.
Summary of the invention
For above-mentioned technical deficiency, the object of the present invention is to provide a kind of casings to constrain Precast Concrete Segmental Bridges pier
Column, which solve wet connection, difficulty of construction is big, the period is long, involvement connect globality poor, cannot apply in highly seismic region the problem of.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
The present invention provides a kind of casing constraint Precast Concrete Segmental Bridges pier stud, including pier stud basis, assembled pier stud, prestressing force
Muscle, energy consumption reinforcing bar one, energy consumption reinforcing bar two, casing and concrete, the assembly pier stud includes that sequentially coaxially line is set from top to bottom
Bottom prefabricated subsection, several standard prefabricated subsections and the top prefabricated subsection set；One end of the presstressed reinforcing steel is described
Anchoring in pier stud basis, the other end pass through the assembled pier stud center and anchor on the top prefabricated subsection, the energy consumption steel
It muscle one and the equal circular array of the energy consumption reinforcing bar two arrangement and is coaxially set with the assembled pier stud, the energy consumption reinforcing bar
Respectively with the assembled pier stud and the pier stud foundation anchor, the assembly pier stud periphery is nested with described sleeve pipe at two both ends,
Described sleeve pipe and the assembled pier stud form annular chamber, are perfused with the concrete, the energy consumption reinforcing bar one in the annular chamber
Both ends respectively with the concrete and the pier stud foundation anchor.
Preferably, the energy consumption reinforcing bar one and two material of energy consumption reinforcing bar include low-alloy steel bar, Low Yield Point Steel
Muscle, stainless reinforcing bar and stainless steel cladding reinforcing bar.
Preferably, the presstressed reinforcing steel material includes steel strand wires, high strength cast iron and fibre reinforced composites (FRP)
Muscle.
Preferably, described sleeve pipe type includes steel sleeve and FRP casing, and cross sectional shape includes circle, rectangle, ellipse
Shape and equilateral polygon.
Preferably, standard prefabricated subsection and bottom prefabricated subsection, standard prefabricated subsection and top prefabricated subsection and adjacent
Two standard prefabricated subsections face and face between the edge joint position that is formed, reserve shear key as needed, shear key simultaneously can
Location and installation for each standard prefabricated subsection.
Preferably, the section shape of the standard prefabricated subsection, the bottom prefabricated subsection and the top prefabricated subsection
Shape includes circle, rectangle, ellipse and equilateral polygon, and the standard prefabricated subsection requires to adopt according to sectional dimension and calculating
With solid form or hollow form, when using solid form, standard prefabricated subsection should reserve presstressed reinforcing steel duct.
Preferably, it is provided on the bottom prefabricated subsection, the standard prefabricated subsection and the top prefabricated subsection
Presstressed reinforcing steel duct, energy consumption reinforcing bar duct is provided on the bottom prefabricated subsection, and the energy consumption reinforcing bar channel surfaces are coarse
Face.
Preferably, the height of described sleeve pipe is less than 1~5cm of height of the assembled pier stud.
Preferably, top prefabricated subsection should reserve presstressed reinforcing steel anchorage position, to facilitate the fixed construction of presstressed reinforcing steel.
Preferably, the energy consumption reinforcing bar one and energy consumption reinforcing bar two should reserve soap-free emulsion polymeization section in pier stud foundation.The present invention
Additionally provide a kind of construction method of casing constraint Precast Concrete Segmental Bridges pier stud, comprising the following steps:
(1) energy consumption reinforcing bar one, energy consumption reinforcing bar two and prestressing force are reserved according to design requirement in construction, on the basis of pier stud
Soap-free emulsion polymeization section is reserved in muscle, the part of energy consumption reinforcing bar one, energy consumption reinforcing bar two in pier stud basis；
(2) bottom prefabricated subsection is lifted, after positioning, install to it according to energy consumption reinforcing bar two, using grouting material grout and is shaken
Puddling is real；
(3) standard prefabricated subsection successively is installed and top prefabricated subsection passes through tensioned prestressing bar shape upon installation
At assembled pier stud；
(4) casing is installed in assembled pier stud periphery；
(5) casting concrete in the annular chamber formed between casing and assembled pier stud.
The beneficial effects of the present invention are:
(1) each prefabricated subsection in assembled pier stud can make in factory, and mass production may be implemented, produce
It is high-efficient；Scene connects the assembled pier stud of installation using tensioned prestressing bar involvement, its is made to bear top whole vertical load, can be with
Guarantee the quick joining of subsequent handling, improves construction efficiency；
(2) live wet construction is few, it is only necessary to fill the intracavitary smaller space of shape, and casing can be used as cast-in-place coagulation
The template of soil, there is no the bindings of supporting module needed for traditional wet connection and live reinforcing bar, without grout sleeve connection etc.
Required special constructional technique requirement, facilitates site operation；
(3) casing entirety or local restriction assembly pier stud are used, the overall stiffness and carrying energy of assembled pier stud can be improved
Power delays the seismic Damage of concrete at suspension column, also need to only remove the cast-in-place concrete parts of casing constraint after shake as repaired
With replacement energy consumption reinforcing bar；
(4) residual deformation controls after the shake of assembled pier stud may be implemented in post-stress technology, using section containing soap-free emulsion polymeization
Energy consumption reinforcing bar simultaneously makes it surrender the energy dissipation capacity that assembled pier stud can be improved and the rigidity after first yield in batches, reduces assembled pier
The earthquake maximum displacement response and residual deformation of column, to improve the recoverable function of structure.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
Some embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the structural schematic diagram (casing that a kind of casing provided in an embodiment of the present invention constrains Precast Concrete Segmental Bridges pier stud
It is identical as assembled pier stud height)；
Fig. 2 is the structural schematic diagram (assembly that a kind of casing provided in an embodiment of the present invention constrains Precast Concrete Segmental Bridges pier stud
Pier stud height is greater than casing height)；
Fig. 3 is the cross-sectional view in Fig. 1 and Fig. 2 at A-A (prefabricated subsection section is solid situation)；
Fig. 4 is the cross-sectional view in Fig. 1 and Fig. 2 at A-A (prefabricated subsection section is hollow situation)；
Fig. 5 is the construction method step one of embodiment；
Fig. 6 is the construction method step two of embodiment；
Fig. 7 is the construction method step three of embodiment；
Fig. 8 is the construction method step four of embodiment；
Fig. 9 is the construction method step five of embodiment 1；
Figure 10 is the construction method step five of embodiment 2.
Description of symbols:
1, pier stud basis, 2, energy consumption reinforcing bar one, 3, presstressed reinforcing steel, 4, bottom prefabricated subsection, 41, energy consumption reinforcing bar duct,
42, grouting material, 43, presstressed reinforcing steel duct, 5, standard prefabricated subsection, 6, edge joint position, 7, top prefabricated subsection, 8, energy consumption reinforcing bar
Two, 9, casing, 10, concrete, 11, standard prefabricated subsection it is hollow when hollow space, 12, on-site hoisting equipment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
Embodiment 1:
As shown in Fig. 1, Fig. 3~Fig. 9, a kind of casing constraint Precast Concrete Segmental Bridges pier stud, including pier stud basis 1, assembled pier
Column, presstressed reinforcing steel 3, energy consumption reinforcing bar 1, energy consumption reinforcing bar 28, casing 9 and concrete 10, the assembly pier stud includes under
Bottom prefabricated subsection 4, several standard prefabricated subsections 5 and the top prefabricated subsection 7 being arranged to upper sequentially coaxially line；It is described
One end of presstressed reinforcing steel 3 anchors in the pier stud basis 1, and it is pre- at the top that the other end passes through the assembled pier stud center
Anchored on segment 7 processed, the energy consumption reinforcing bar 1 and the equal circular array of the energy consumption reinforcing bar 28 arrangement and with the assembled pier
Column is coaxially set, and the both ends of the energy consumption reinforcing bar 28 are anchored with the assembled pier stud and pier stud basis 1 respectively, institute
It states assembled pier stud periphery and is nested with described sleeve pipe 9, described sleeve pipe 9 and the assembled pier stud form annular chamber, in the annular chamber
Be perfused with the concrete 10, the both ends of the energy consumption reinforcing bar 1 respectively with the concrete 10 and basic 1 anchor of the pier stud
Gu the height of described sleeve pipe 9 is less than 1~5cm of height of the assembled pier stud.
The energy consumption reinforcing bar 1 and 28 material of energy consumption reinforcing bar include low-alloy steel bar, low-yield reinforcing bar, stainless
Reinforcing bar and stainless steel cladding reinforcing bar by energy consumption reinforcing bar 1, energy consumption reinforcing bar 28 and bend it in batches when an earthquake occurs
The energy dissipation capacity that assembled pier stud can be improved and the rigidity after first yield are taken, the earthquake maximum displacement response of assembled pier stud is reduced
And residual deformation can be used for providing in normal use lateral rigidity and carrying energy to improve structure recoverable function
Power.
3 material of presstressed reinforcing steel includes steel strand wires, high strength cast iron and fibre reinforced composites (FRP) muscle, is being pacified
Assembled pier stud and pier stud basis 1 can be connected by applying prestressing force when dress, speed of application be improved, in water such as earthquakes
Then reset capability can be provided for this assembly pier stud under flat effect and realize effective control of residual deformation after its shake.
9 type of described sleeve pipe includes steel sleeve and FRP casing, and cross sectional shape includes circle, rectangle, ellipse and waits
Side polygon.
Standard prefabricated subsection 5 and bottom prefabricated subsection 4, standard prefabricated subsection 5 and top prefabricated subsection 7 and adjacent
The edge joint position formed between the contact surface and face of two standard prefabricated subsections 5 reserves shear key as needed, and shear key is simultaneously
It can be used in the location and installation of each standard prefabricated subsection 5.
The cross sectional shape packet of the standard prefabricated subsection 5, the bottom prefabricated subsection 4 and the top prefabricated subsection 7
Circle, rectangle, ellipse and equilateral polygon are included, the standard prefabricated subsection 5 is according to sectional dimension and calculates requirement selection in fact
Heart-shaped formula or hollow form, when using solid form, standard prefabricated subsection 5 should reserve presstressed reinforcing steel duct 43.
Pre- answer is provided on the bottom prefabricated subsection 4, the standard prefabricated subsection 5 and the top prefabricated subsection 7
Power muscle duct 43,4 are provided with energy consumption reinforcing bar duct 41 on the bottom prefabricated subsection.
Top prefabricated subsection 7 should reserve the anchorage position of presstressed reinforcing steel 3, to facilitate the fixed construction of presstressed reinforcing steel 3.
A kind of construction method of casing constraint Precast Concrete Segmental Bridges pier stud:
1, the production for carrying out pier stud prefabricated subsection is transported to construction site installation.
2, as shown in figure 5, reserving energy consumption reinforcing bar 1, energy consumption reinforcing bar two when pier stud basis 1 is constructed according to design requirement
8, soap-free emulsion polymeization section is reserved in presstressed reinforcing steel 3, energy consumption reinforcing bar 1 and part of the reinforcing bar 28 in basis of consuming energy.
3, as shown in fig. 6, lifting bottom prefabricated subsection 4, positioned according to the energy consumption reinforcing bar 28 reserved on pier stud basis 1,
After installation, using grouting material 42 will consume energy reinforcing bar duct 41 pour it is closely knit.
4, as shown in Figure 7 and Figure 8, standard prefabricated subsection 5 is successively installed, after prefabricated subsection 6 at the top of installation, by opening
The tensioned prestressing bar 3 through prestressed pore passage 43 is drawn to form assembled pier stud.
5, casing 9, the casting concrete 10 in its annular chamber between assembled pier stud, as shown in Fig. 9 are installed.
Embodiment 2:
The present embodiment is illustrated in conjunction with Fig. 2~Fig. 8, Figure 10；A kind of casing constraint Precast Concrete Segmental Bridges pier stud, this reality
Apply example 2 and the difference of embodiment 1 be only that, it is only arranged within the scope of the certain altitude of assembled pier stud lower end casing 9, make its
While playing advantage of the present invention, there is better economy.
The construction method difference of the present embodiment 2 and embodiment 1 is detailed in Figure 10, and casing 9 is only in assembled pier stud lower end when construction
Within the scope of certain altitude be arranged, casing 9 only its bottom and pier stud basis 1 top between preset clearance.
The invention has the advantages that each prefabricated subsection in (1) assembly pier stud can make in factory, batch may be implemented
Metaplasia produces, high production efficiency；Scene connects the assembled pier stud of installation using tensioned prestressing bar involvement, so that it is born top all perpendicular
To load, it is ensured that the quick joining of subsequent handling improves construction efficiency；
(2) live wet construction is few, it is only necessary to fill the intracavitary smaller space of shape, and casing can be used as cast-in-place coagulation
The template of soil, there is no the bindings of supporting module needed for traditional wet connection and live reinforcing bar, without grout sleeve connection etc.
Required special constructional technique requirement, facilitates site operation；
(3) casing entirety or local restriction assembly pier stud are used, the overall stiffness and carrying energy of assembled pier stud can be improved
Power delays the seismic Damage of concrete at suspension column, also need to only remove the cast-in-place concrete parts of casing constraint after shake as repaired
With replacement energy consumption reinforcing bar；
(4) residual deformation controls after the shake of assembled pier stud may be implemented in post-stress technology, using section containing soap-free emulsion polymeization
Energy consumption reinforcing bar simultaneously makes it surrender the energy dissipation capacity that assembled pier stud can be improved and the rigidity after first yield in batches, reduces assembled pier
The earthquake maximum displacement response and residual deformation of column, to improve the recoverable function of structure；
(5) FRP is used in the bridge structure middle sleeve of the chloride erosions environment such as ocean, the durability of the assembly pier stud is more
It is good.
Obviously, various changes and modifications can be made to the invention without departing from of the invention by those skilled in the art
Spirit and scope.In this way, if these modifications and changes of the present invention belongs to the model of the claims in the present invention and its equivalent technologies
Within enclosing, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of casing constrains Precast Concrete Segmental Bridges pier stud, it is characterised in that: including pier stud basis, assembled pier stud, presstressed reinforcing steel,
Consume energy reinforcing bar one, energy consumption reinforcing bar two, casing and concrete, and the assembly pier stud includes that sequentially coaxially line is arranged from top to bottom
Bottom prefabricated subsection, several standard prefabricated subsections and top prefabricated subsection；One end of the presstressed reinforcing steel is in the pier stud
Anchoring in basic, the other end pass through the assembled pier stud center and anchor on the top prefabricated subsection, the energy consumption reinforcing bar one
It arranges with the equal circular array of the energy consumption reinforcing bar two and is coaxially set with the assembled pier stud, the two of the energy consumption reinforcing bar two
Respectively with the assembled pier stud and the pier stud foundation anchor, the assembly pier stud periphery is nested with described sleeve pipe, the set at end
Pipe forms annular chamber with the assembled pier stud, and the concrete, the both ends of the energy consumption reinforcing bar one are perfused in the annular chamber
Respectively with the concrete and the pier stud foundation anchor.
2. a kind of casing as described in claim 1 constrains Precast Concrete Segmental Bridges pier stud, it is characterised in that: the energy consumption reinforcing bar one
It include low-alloy steel bar, low-yield reinforcing bar, stainless reinforcing bar and stainless steel cladding reinforcing bar with two material of energy consumption reinforcing bar.
3. a kind of casing as described in claim 1 constrains Precast Concrete Segmental Bridges pier stud, it is characterised in that: the presstressed reinforcing steel material
Matter includes steel strand wires, high strength cast iron and FRP tendons.
4. a kind of casing as described in claim 1 constrains Precast Concrete Segmental Bridges pier stud, it is characterised in that: described sleeve pipe type packet
Steel sleeve and FRP casing are included, cross sectional shape includes circle, rectangle, ellipse and equilateral polygon.
5. a kind of casing as described in claim 1 constrains Precast Concrete Segmental Bridges pier stud, it is characterised in that: the prefabricated section of standard
The cross sectional shape of section includes circle, rectangle, ellipse and equilateral polygon.
6. a kind of casing as described in claim 1 constrains Precast Concrete Segmental Bridges pier stud, it is characterised in that: the prefabricated section in bottom
Presstressed reinforcing steel duct, the bottom prefabricated subsection are provided on section, the standard prefabricated subsection and the top prefabricated subsection
On be provided with energy consumption reinforcing bar duct.
7. a kind of casing as described in claim 1 constrains Precast Concrete Segmental Bridges pier stud, it is characterised in that: the height of described sleeve pipe
It is slightly less than 1~5cm of height of the assembled pier stud.
8. a kind of construction method of casing described in claim 1 constraint Precast Concrete Segmental Bridges pier stud, it is characterised in that: including with
Lower step:
(1) energy consumption reinforcing bar one, energy consumption reinforcing bar two and presstressed reinforcing steel, consumption are reserved according to design requirement in construction, on the basis of pier stud
It can the reserved soap-free emulsion polymeization section in the part of reinforcing bar one, energy consumption reinforcing bar two in pier stud basis；
(2) bottom prefabricated subsection is lifted, after positioning, install to it according to energy consumption reinforcing bar two, using grouting material grout and is vibrated close
It is real；
(3) standard prefabricated subsection successively is installed and top prefabricated subsection forms assembly by tensioned prestressing bar upon installation
Pier stud；
(4) casing is installed in assembled pier stud periphery；
(5) casting concrete in the annular chamber formed between casing and assembled pier stud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910184182.5A CN110042741A (en) | 2019-03-12 | 2019-03-12 | A kind of casing constraint Precast Concrete Segmental Bridges pier stud and its construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910184182.5A CN110042741A (en) | 2019-03-12 | 2019-03-12 | A kind of casing constraint Precast Concrete Segmental Bridges pier stud and its construction method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359363A (en) * | 2019-07-26 | 2019-10-22 | 山东建筑大学 | Prestressing force assembled Self-resetting bridge pier column node and method are cohered in a kind of part |
| CN111005307A (en) * | 2019-12-17 | 2020-04-14 | 中国矿业大学 | Rapid-masonry reinforced concrete pier stud and construction method thereof |
| CN111335153A (en) * | 2020-03-10 | 2020-06-26 | 西南交通大学 | Assembled hollow pier and construction method thereof |
| CN112627017A (en) * | 2021-01-11 | 2021-04-09 | 深圳市天健(集团)股份有限公司 | Assembled pier with gradually-changed rigidity and replaceable energy consumption bar and construction method thereof |
| CN114000656A (en) * | 2021-11-29 | 2022-02-01 | 同济大学 | Partially unbonded grouting sleeve prefabricated assembly connecting structure and construction method |
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| JPH0913321A (en) * | 1995-06-30 | 1997-01-14 | Ohbayashi Corp | Reinforced structure of bridge pier column |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110359363A (en) * | 2019-07-26 | 2019-10-22 | 山东建筑大学 | Prestressing force assembled Self-resetting bridge pier column node and method are cohered in a kind of part |
| CN110359363B (en) * | 2019-07-26 | 2021-01-01 | 山东建筑大学 | Partially-bonded prestressed assembly type self-resetting bridge pier column node and method |
| CN111005307A (en) * | 2019-12-17 | 2020-04-14 | 中国矿业大学 | Rapid-masonry reinforced concrete pier stud and construction method thereof |
| CN111335153A (en) * | 2020-03-10 | 2020-06-26 | 西南交通大学 | Assembled hollow pier and construction method thereof |
| CN112627017A (en) * | 2021-01-11 | 2021-04-09 | 深圳市天健(集团)股份有限公司 | Assembled pier with gradually-changed rigidity and replaceable energy consumption bar and construction method thereof |
| CN114000656A (en) * | 2021-11-29 | 2022-02-01 | 同济大学 | Partially unbonded grouting sleeve prefabricated assembly connecting structure and construction method |
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