WO2019206192A1 - 一种预制柱/梁及其连接结构及其施工方法 - Google Patents

一种预制柱/梁及其连接结构及其施工方法 Download PDF

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Publication number
WO2019206192A1
WO2019206192A1 PCT/CN2019/084136 CN2019084136W WO2019206192A1 WO 2019206192 A1 WO2019206192 A1 WO 2019206192A1 CN 2019084136 W CN2019084136 W CN 2019084136W WO 2019206192 A1 WO2019206192 A1 WO 2019206192A1
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WO
WIPO (PCT)
Prior art keywords
column
prefabricated
embedded
column body
wall panel
Prior art date
Application number
PCT/CN2019/084136
Other languages
English (en)
French (fr)
Inventor
李藏柱
Original Assignee
Li Cangzhu
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201810381812.3A external-priority patent/CN108442512B/zh
Priority claimed from CN201810381333.1A external-priority patent/CN108425375A/zh
Application filed by Li Cangzhu filed Critical Li Cangzhu
Publication of WO2019206192A1 publication Critical patent/WO2019206192A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/21—Connections specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/22—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material with parts being prestressed

Definitions

  • the invention relates to a prefabricated building structure, in particular to a prefabricated column/beam and its connecting structure and a construction method thereof.
  • Existing precast concrete columns and beams are generally solid structures, and precast concrete columns are taken as an example.
  • the top of the column is provided with upwardly extending steel bars, and the bottom of the column is pre-buried with a grouting sleeve, and the precast concrete columns of the upper and lower layers are mainly connected by a grouting sleeve.
  • the grout sleeve includes a sleeve open at both ends and a feed port 101 and a slurry port 102 mounted on the side wall of the sleeve.
  • the sleeve is pre-buried in the upper column 103, and the pre-embedded rib 104 of the upper column is inserted into the sleeve, and the sleeve feed port and the slurry outlet are reserved outside the upper column.
  • the connecting rib 106 protruding from the lower column 105 is inserted into the sleeve; after the component is installed and positioned, the joint 107 of the upper column and the lower column is filled, and then the grout is injected from the feeding hole to combine the reinforcing bar with the sleeve. , to play a role.
  • the steel bar After the steel bar is inserted into the sleeve, the steel bar is placed in a sealed environment by grouting to solve the anti-corrosion/durability problem, and the joint strength is better than the above two methods of welding and bolting.
  • grouting material plays a decisive role in the quality of connection. It must be filled with fullness, no slurry leakage and no shrinkage. However, it is difficult to connect the vertical members in particular, which is easy to leak and cannot be quality checked. Ensure the quality of the connection, the quality controllability is poor; the quality of the connection directly affects the connection strength of the steel bar, forming an ineffective connection (steel core pulling phenomenon), resulting in building safety hazards.
  • connection effect of the grouting sleeve directly affects the integrity of the upper and lower prefabricated columns and the adjacent two prefabricated beams. Due to the above shortcomings of the grouting sleeve, the formed structure is poor in overall structure and low in seismic resistance.
  • the object of the present invention is to provide a prefabricated column/beam and a connecting structure thereof, which has convenient connection operation, strong node and good seismic performance.
  • a prefabricated column/beam connection structure including a concrete prefabricated column body/beam body, and a plurality of pre-sets are provided at both ends of the column body/beam body Buried steel bar, one end of the pre-embedded steel bar protrudes from the end surface of the column body/beam body, and the end of the protruding portion of the pre-embedded steel bar is provided with an enlarged head, the enlarged head size is larger than the diameter of the pre-embedded steel bar; the adjacent two column bodies/beams The main body is butted in the longitudinal direction; the end post-casting belt is disposed between the two adjacent column bodies/beam bodies; the enlarged heads of the pre-embedded steel bars belonging to the two prefabricated columns/beams are connected by a sleeve.
  • the sleeve comprises a cylinder body and a shrinkage joint integrally connected to the two ends of the cylinder body.
  • the cylinder body is provided with a plurality of grouting holes; after the enlarged head protrudes into the sleeve, the concrete is poured into the end and the concrete slurry is poured from the grouting hole. After flowing into the cylinder, after the cement slurry solidifies, the enlarged head is fixed inside the cylinder, and the pre-embedded steel bars can be restricted from being pulled out, thereby connecting the prefabricated columns/beams at both ends into a whole.
  • the adjacent prefabricated columns/beams are well connected together, the column/beam integrity is improved, and the sleeve connection structure adopts the ⁇ principle to convert the tensile force of the steel joint into the cylinder.
  • the pressure of the concrete, which is transmitted to the cylinder, is more securely connected, solving the problem of the prior art column/beam connection integrity and poor seismic resistance.
  • the enlarged head itself can strengthen the connection with the post-cast concrete.
  • the side of the column body/beam body is provided with a connecting hole on the side of the connecting hole, and the connecting rib is inserted into the connecting hole to connect the prefabricated wallboard on both sides of the column body, or the beam body and the prefabricated wall at the top thereof
  • the plates are connected so that all the prefabricated components are effectively connected to form a whole, which improves the seismic performance.
  • the column body/beam body side is pre-embedded and connected with the steel bar, and is arranged to expand the head, so that the sleeve connection with other components can be realized, the connection is more convenient, and the connection effect is better.
  • the U-shaped ribs are pre-buried on the side of the column body/beam body, and the pre-formed U-shaped connecting ribs on the adjacent members are cross-connected to form an overlapping area, and the reinforcing bars are inserted in the overlapping area to enhance the connection effect.
  • the prefabricated column/beam is arranged in a hollow structure to reduce the self weight
  • the arrangement of two rebars and the two rebars are connected to each other to form a grid structure, thereby improving the tensile, compressive, bending and shear resistance of the prefabricated columns/beams, and is less likely to be damaged during an earthquake. damage.
  • the pre-stressed steel bar is internally provided to improve the bending resistance, so that the prefabricated beam can be applied to a building having a larger span, and the prefabricated column can be applied to a structure with a higher clearance.
  • a pre-buried steel plate, a pre-embedded angle iron, and a bolt sleeve are disposed on the column body/beam body to facilitate installation and is safer.
  • the end of the pre-embedded reinforcing bar extending from the top surface of the prefabricated column body is provided with an expanding head, and the end extending from the bottom surface of the prefabricated column body is bent inward or outward to form a leg; the prefabricated column body is buried in the ground as a foundation prefabrication Column; the foundation prefabricated column has high construction speed and high installation precision.
  • the end of the pre-embedded reinforcing bar extending from the top surface of the prefabricated column body is provided with a threaded buckle, and the nut is screwed into the threaded buckle to change the end into an enlarged head, so that the processing of the enlarged head is more flexible.
  • Another object of the present invention is to provide a method for constructing a joint structure of a prefabricated column/beam.
  • the method has simple installation steps, high construction efficiency, firm construction and good earthquake resistance.
  • a method for constructing a foundation prefabricated column/beam comprising the following installation steps: step a, aligning two prefabricated beams or two prefabricated columns along a length direction; Step b, using a sleeve to connect and fix the enlarged heads of the two prefabricated columns pre-embedded steel bars; step c, pouring the ends and then pouring the belts.
  • connection of the prefabricated column/beam pre-embedded steel bar is more convenient, no separate grouting operation is required, the construction is efficient, and the connection effect is good; the integrity of the column/beam structure and the earthquake resistance are improved.
  • the present invention has the following technical effects:
  • the prefabricated column/beam has better structure and the performance of various aspects is significantly improved, which can be applied to special building requirements such as large span, high clearance and strong pressure;
  • the installation operation is simple, does not need a separate grouting process, saves grouting, and the sleeve is installed with less influence on the position of the steel bar, the sleeve has the amount of activity, and does not need to be completely aligned, so the construction is efficient, economical and efficient.
  • Figure 1 is a schematic view of a prefabricated column/beam structure
  • Figure 2 is a schematic view showing the connection structure of two prefabricated columns/beams for setting the end strips
  • Figure 3 is a schematic plan view of a cross section of a prefabricated column
  • Figure 4 is a schematic cross-sectional view of a prefabricated column
  • Figure 5 is a schematic view showing a cross section of a prefabricated column in a rectangular shape with a double hole
  • Figure 6 is a schematic view of a cylindrical hollow structure
  • Figure 7 is a schematic view of a square column hollow structure
  • Figure 8 is a schematic view of a square column hollow structure
  • Figure 9 is a schematic view showing the structure of a hollow column provided with double ribs
  • Figure 10 is a schematic view showing the structure of a square column in which double ribs and stirrups are provided;
  • Figure 11 is a schematic view showing the structure of a square hollow square column with double ribs
  • Figure 12 is a schematic view showing a cylindrical structure of a double-layer steel mesh frame
  • Figure 13 is a schematic view showing the structure of a double-layer steel mesh square column
  • Figure 14 is a schematic view showing a cylindrical structure in which a small hollow is provided
  • Figure 15 is a schematic view showing the connection structure of concrete poured in a hollow column
  • Figure 16 is a schematic view showing the connection structure of the concrete poured in the blind hole
  • Figure 17 is a schematic view showing the connection structure of the reinforcing ribs in the hollow
  • Figure 18 is a schematic view showing the structure of a prefabricated column in which prestressed steel bars are disposed;
  • Figure 19 is a schematic view showing the structure of a precast beam provided with prestressed steel bars
  • Figure 20 is a schematic view showing the connection structure of the prefabricated column and the precast beam
  • 21 is a schematic structural view of a prefabricated column in which a pre-embedded iron plate is disposed at a tip end;
  • Figure 22 is a schematic structural view of a precast beam provided with a pre-embedded iron plate and a bolt sleeve on the bottom surface;
  • Figure 23 is a schematic view showing the structure of a prefabricated column in which a pre-buried angle iron is disposed at a tip end;
  • Figure 24 is a schematic view showing the structure of a prefabricated column provided with a bolt sleeve at the end;
  • Figure 25 is a schematic view of the connection structure of the prefabricated column and the precast beam bolt sleeve
  • Figure 26 is a schematic view of the connection structure of the prefabricated column and the precast beam bolt sleeve
  • Figure 27 is a schematic view showing the structure of a prefabricated column with U-shaped connecting ribs on the side;
  • Figure 28 is a schematic view showing the structure of a prefabricated column in which U-shaped connecting ribs are arranged on the circumference;
  • Figure 29 is a schematic view showing the connection structure of the prefabricated column and the surrounding prefabricated wallboard
  • Figure 30 is a schematic view showing the connection structure of a prefabricated column and a prefabricated prefabricated wall panel provided with a U-shaped connecting rib;
  • Figure 31 is a schematic view showing the connection structure of a prefabricated column and an L-shaped prefabricated wall panel in which a U-shaped connecting rib is disposed;
  • Figure 32 is a schematic view showing the structure of a prefabricated column provided with connecting bars on the side;
  • Figure 33 is a cross-sectional view showing the structure of a prefabricated column provided with connecting reinforcing bars on the side;
  • Figure 34 is a schematic view showing the connection structure of a prefabricated column provided with a connecting reinforcing bar on the side and a cross-shaped prefabricated wallboard;
  • Figure 35 is a schematic view showing the connection structure of a prefabricated column and a T-shaped prefabricated wall panel provided with connecting steel bars on the side;
  • Figure 36 is a schematic view showing the connection structure of a prefabricated column provided with a connecting steel bar on the side and an L-shaped prefabricated wall panel;
  • Figure 37 is a schematic view showing the structure of a prefabricated column provided with a connecting hole on the side;
  • Figure 38 is a schematic view showing the connection structure of a prefabricated column provided with a connecting hole on the side and a cross-shaped prefabricated wall panel;
  • Figure 39 is a schematic view showing the connection structure of a prefabricated column provided with a connecting hole on the side and a T-shaped prefabricated wall panel;
  • Figure 40 is a schematic view showing the connection structure of a prefabricated column provided with a connecting hole on the side and an L-shaped prefabricated wall panel;
  • Figure 41 is a schematic view showing a connection structure between a prefabricated column and a prefabricated wall panel in which a connecting bar is disposed on one side of a U-shaped connecting rib;
  • Figure 42 is a schematic structural view of a foundation prefabricated column
  • Figure 43 is a schematic view showing the installation of the base prefabricated column into the foundation pit
  • Figure 44 is a schematic view showing the connection structure of the base prefabricated column and the upper prefabricated column;
  • Figure 45 is a schematic structural view of a cylindrical body in a shrink-type reinforcing steel connecting sleeve
  • Figure 46 is a schematic end view of the neck
  • Figure 47 is a schematic view of the fit of the sleeve and the connecting bar
  • Figure 48 is a schematic view showing the connection relationship between the shrinkage type steel connecting sleeve and the prefabricated column;
  • Figure 49 is a schematic structural view of a split type cylinder
  • Figure 50 is a schematic view showing the connection relationship between the split cylinder and the precast column
  • Figure 51 is a schematic view showing the structure of the sleeve connected to the two reinforcing bars in the vertical state;
  • Figure 52 is a schematic structural view of the outer sleeve member
  • Figure 53 is a schematic view showing the assembly of the outer sleeve and the connecting reinforcing bar
  • Figure 54 is a schematic view of the overall structure of the grouting sleeve
  • Figure 55 is a schematic view showing the structure of a grouting sleeve of the prior art.
  • the prefabricated columns are similar in structure to the precast beams, the joining methods are also substantially the same, so hereinafter, the prefabricated columns are mainly used for illustration.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • a prefabricated column includes a concrete prefabricated column body 11 , and a plurality of pre-embedded reinforcing bars 13 are disposed at two ends of the column body 11 , and one end of the pre-embedded reinforcing bar 13 protrudes from an end surface of the column body 11 .
  • the end of the protruding portion of the embedded reinforcing bar 13 is provided with an expanding head 130 having a size larger than the diameter of the embedded reinforcing bar 13.
  • a tip post-casting strip 3 is disposed between the ends of two adjacent prefabricated columns.
  • the enlarged head 130 of the pre-embedded reinforcing bars 13 belonging to the two prefabricated columns is inserted into Specially made in the sleeve 2.
  • the concrete is then poured into the end and the concrete is poured into the sleeve 2, and the two prefabricated columns are finally joined together.
  • the cross section of the prefabricated column may be square, rectangular or circular; as shown in Fig. 3-4, the prefabricated column may be a solid structure along the length direction, as shown in Fig. 5-8, the prefabricated column also It may be arranged in a hollow 8 structure along the length direction, and the hollow 8 may have a square or circular cross section.
  • the hollow 8 structure can reduce the self-weight of the prefabricated column, saving material and facilitating installation.
  • the hollow 8 may be provided in plurality, for example, when the cross section of the prefabricated column is rectangular, two circular hollows 8 may be provided.
  • the column body 11 has a hollow 8 structure, and the column body 11 is provided with two rebars in the longitudinal direction.
  • the diameter of the outer ring reinforcing bar 14 is larger than the diameter of the inner ring reinforcing bar 15, and the inner ring reinforcing bar 15 is denser than the outer ring reinforcing bar 14.
  • the outer ring reinforcing bar 14 and/or the inner ring reinforcing bar 15 of the column main body 11 can be used as the above-mentioned pre-embedded reinforcing bar 13, and both ends thereof are extended to the end face of the column main body 11, and the head 130 is enlarged.
  • the arrangement of the inner ring reinforcement 15 mainly strengthens the hollow 8 of the column body 11, so that the hollow column 8 is less susceptible to damage when the prefabricated column encounters a large external force such as an earthquake.
  • the outer ring reinforcing bar 14 and the inner ring reinforcing bar 15 of the column body 11 are provided with a plurality of stirrups 16 in the longitudinal direction.
  • the stirrups 16 of each outer ring reinforcing bar 14 are sleeved on the outer periphery; the stirrups 16 of the inner ring reinforcing bar 15 may be disposed only in the inner circumference, or may be disposed inside and outside.
  • the outer ring reinforcing bar 14 of the column body 11 and the inner ring reinforcing bar 15 are integrally joined by a connecting rib 17, forming a grid structure.
  • the connecting rib 17 may be directly connected to the inner ring reinforcing bar 15 or the outer ring reinforcing bar 14, or one end thereof may be connected to the stirrup 16 .
  • the prefabricated column of this arrangement has a better force-bearing structure and can be applied to a prefabricated column having a larger cross section or an extremely long length.
  • the hollow 8 when the section of the prefabricated column is large, the hollow 8 includes a large hollow 81 at a center position and a small hollow 82 at the periphery thereof, and all the hollows 8 are spaced apart from each other.
  • the hollow size setting further reduces the weight of the prefabricated column, saves material and facilitates installation.
  • the small hollow 82 can be inserted into the prestressed steel strand, the prestressed steel or the prestressed steel bundle, and grouted in the small hollow 82. This solution allows the prefabricated column to be set up as a pre-stressed structure for better pull-out resistance.
  • the column body 11 is disposed in the longitudinal direction as a hollow 8, and the adjacent two column bodies 11 are butted in the longitudinal direction; the end post-casting belt 3 is disposed between the adjacent two column bodies 11; The enlarged head 130 of the column embedded steel bar 13 is connected by a sleeve 2; the hollow 8 is filled with concrete and integrated with the concrete of the end back pouring belt 3.
  • the hollow 8 may be sealed with a template, a rubber pad or the like before the pouring of the belt 3 concrete, so that the hollow 8 has a blind hole 83 structure, and the blind hole 83 is also the same. Pouring concrete.
  • the end post-casting strip 3 may further be provided with reinforcing ribs 31.
  • the two ends of the reinforcing ribs 31 respectively extend into the hollows 8 of the column bodies 11 on both sides thereof, thereby further strengthening the joint nodes. .
  • stirrup 16 may be provided around the reinforcing rib 31 and the pre-embedded reinforcing bar 13.
  • prestressed steel bars or prestressed steel strands 18 may be placed around the prefabricated columns.
  • prestressed steel bars or prestressed steel strands 18 may also be provided at the bottom of the precast beam.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • connection structure between the prefabricated column and the precast beam may be that the prefabricated beam is overlapped on the top of the prefabricated column, and the prefabricated column is overlapped on the upper surfaces of the two prefabricated beams. They are connected to each other by a sleeve 2.
  • the steel plate 41 is embedded in the top surface of the end of the column body 11, and the embedded steel plate 41 is provided on the bottom surface of the beam body 12. After the lap joint, the steel plate is welded.
  • a pre-embedded angle iron 42 may also be provided at the end of the column body 11 and the beam body 12. The pre-embedded angle iron 42 wraps the column body 11. After the lap joint, the pre-embedded angle iron 42 is welded.
  • the bolt sleeve 43 may be embedded on the side of the end of the column body 11, and the bottom surface of the beam body 12 is provided with a pre-embedded bolt sleeve 43 near the end.
  • the fixed angle iron is attached to the overlapping corner, and then the fixing bolt 44 is screwed to fix the beam body 12 and the column body 11. In this case, the fixed angle iron is located on the lower surface of the precast beam.
  • an embedded bolt sleeve 43 may be disposed on the end surface of the column body 11 and the end surface of the beam body 12, and the fixed angle iron is placed on the upper end surface of the column body 11 to fix the precast beam and the prefabricated column. 44 connections.
  • the fixed angle iron is finally poured into the end back pouring belt 3, and no disassembly is required, thereby improving the construction efficiency.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • a prefabricated column as shown in FIG. 27 and FIG. 28, a U-shaped connecting rib 51 is disposed on a side of the column body 11, and an open end of the U-shaped connecting rib 51 is embedded in the column body 11; the U-shaped connecting rib 51 can be located according to the position
  • the corner features are set to one-sided, double-sided, three-sided or four-sided.
  • a joint structure of a prefabricated column as shown in FIG. 29, further comprising a prefabricated wall panel 7, the side end surface of the prefabricated wall panel 7 is pre-embedded with U-shaped ribs 71; and the prefabricated wall panel 7 is disposed on the side of the prefabricated column, A vertical post-casting belt 72 is disposed therebetween; the pre-embedded U-shaped ribs 71 of the prefabricated wall panel 7 intersect with the U-shaped connecting ribs 51 of the column body 11 to form an overlapping area, and the reinforcing bars are vertically inserted in the overlapping area.
  • the connecting structure firmly combines the prefabricated wall panel 7 and the prefabricated column, so that the structure is stable and the seismic performance is good.
  • the U-shaped connecting rib 51 is provided only on the upper surface of the beam body 12.
  • the U-shaped connecting rib 51 on the upper surface of the beam body 12 can be connected to the reinforcing bars provided in the end post-casting strip 3 at the top thereof. And finally poured in the end of the backing belt 3.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the side end surface of the prefabricated wall panel 7 is pre-embedded with the expanded rebar 73; one end of the expanded rebar 73 is embedded in the prefabricated wall panel 7, and the other end protrudes from the prefabricated wall panel. 7.
  • the end is provided as an enlarged head 130; a vertical rear pouring belt 72 is disposed between the side end faces of the two prefabricated wall panels 7, and the expanded steel bars 73 are connected by the sleeve 2; the column body 11 is disposed on the vertical backing belt 72.
  • the U-shaped connecting rib 51 extends into the vertical post-casting belt 72.
  • the prefabricated columns are attached to the two sides of the corners with U-shaped connecting ribs 51, and the U-shaped connecting ribs 51 extend into the vertical backing belt 72.
  • the reinforcing cage 32 is vertically disposed, and the reinforcing cage 32 includes a vertical rib 33 and a stirrup 16 to cross-connect the reinforcing cage 32 and the U-shaped connecting rib 51.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • the side of the column body 11 is pre-embedded with the reinforcing bars 52; it can be disposed on one side or on multiple sides.
  • the end of the connecting rebar 52 is an enlarged head 130.
  • a column body 11 is disposed between the side end faces of the two prefabricated wall panels 7; a vertical rear pouring belt 72 between the column body 11 and the side end faces of the prefabricated wall panels 7, the expanded reinforcing bars 73 and the connecting bars 52 Connected with a sleeve 2.
  • the prefabricated wall panel 7 has a T-shaped structure
  • three sides of the prefabricated column are provided with connecting reinforcing bars 52; as shown in FIG. 36, when the prefabricated wallboard 7 is L-shaped, the prefabricated columns are attached to the corners of the two. The side is connected to the reinforcing bar 52.
  • connection hole 53 may or may not penetrate.
  • the insertion hole 53 can be inserted into the insertion rib 54, and both ends of the insertion rib 54 are provided to enlarge the head 130.
  • a column body 11 is disposed between the side end faces of the two prefabricated wall panels 7; a vertical rear pouring belt 72 between the column body 11 and the side end faces of the prefabricated wall panel 7, the connecting ribs 54 and the connecting bars 52 Connected with a sleeve 2.
  • the prefabricated wall panel 7 when the prefabricated wall panel 7 is T-shaped, the three sides of the prefabricated column are provided with connecting holes 53; as shown in FIG. 40, when the prefabricated wall panel 7 is L-shaped, the prefabricated column and the prefabricated wall panel 7 Connection holes 53 are provided on the two side faces corresponding to the end faces.
  • the concrete to be inserted into the hollow hole 8 is poured into the hollow 8.
  • connecting hole 53, the U-shaped connecting rib 51 and the connecting reinforcing bar 52 which are added on the side of the prefabricated column can be combined on the same prefabricated column to adapt to the different connection environment with the prefabricated wall panel 7.
  • one side of the prefabricated column is provided with a U-shaped connecting rib 51, and the other opposite side is provided with a connecting reinforcing bar 52 with an enlarged head 130.
  • a prefabricated column differs from the above embodiment in that the prefabricated column serves as a base prefabricated column 9 which is shorter than the prefabricated column of the other embodiments, for example, a height of 50 cm, and a prefabricated column.
  • the body 11 is buried underground.
  • the pre-embedded reinforcing bar 13 of the basic prefabricated column 9 extends from the end of the top surface of the prefabricated column body 11 and is provided with an expanding head 130.
  • the end of the bottom surface of the prefabricated column body 11 is bent inward or outward to form a leg 91. . Further, as shown in FIG.
  • the end of the pre-embedded reinforcing bar 13 extending from the top surface of the prefabricated column body 11 is provided with a threaded fastener, and the nut is screwed into the threaded buckle to change the end into the enlarged head 130.
  • the foundation prefabricated column 9 is placed vertically in the foundation pit 92 according to the design position, and concrete is poured at the bottom of the foundation pit 92 to the bottom surface of the foundation prefabricated column 9. After the concrete is initially set, the foundation pit 92 can be backfilled.
  • the advantage of the basic prefabricated column 9 is that time is saved during the construction process, and the position of the basic column and the position of the protruding pre-reinforcing steel bar 13 after the completion of the construction are highly accurate.
  • the specific analysis is as follows:
  • the prior art generally adopts the cast-in-place construction of the foundation column.
  • the construction steps include installing the formwork in the foundation pit 92, pouring the concrete, waiting for the concrete strength to rise, removing the formwork and backfilling the foundation pit 92.
  • the scheme of the basic prefabricated column 9 eliminates the step of arranging the stencil, and waits for the solidification time of the concrete to be short; in addition, since the vertical pre-embedded steel bar in the column is constructed in the factory, it is more capable than the site lashing. The verticality and spacing are guaranteed, and it is not affected by the concrete pouring on site, which greatly improves the construction quality.
  • a connection structure of a prefabricated column includes a column body 11 and a base prefabricated column 9; the pre-embedded reinforcing bar 13 on the bottom surface of the column body 11 is a bottom connecting rib 91, and the end of the bottom connecting rib 91 is enlarged.
  • the head 130; the column body 11 is located directly above the base prefabricated column 9, and the enlarged head 130 at the top of the base prefabricated column 9 and the enlarged head 130 of the bottom rib 91 of the column body 11 are connected by a sleeve 2.
  • a method of constructing a prefabricated column structure comprising the following construction steps:
  • Step a aligning two prefabricated beams or two prefabricated columns along the length direction
  • Step b connecting and fixing the enlarged head 130 of the two prefabricated columns pre-embedded steel bars 13 by the sleeve 2; when the hollow column 8 is arranged in the longitudinal direction of the prefabricated column, the hollow 8 is performed before the pouring of the concrete 3 Blocked.
  • Step c pouring the end 3 and pouring the belt 3.
  • Step a lap the two prefabricated beams on the top surface of the same prefabricated column, or support the prefabricated beams with the temporary support at the bottom so as to be located on both sides of the top surface of the prefabricated column;
  • Step b connecting and fixing the enlarged head 130 of the pre-embedded steel bars 13 belonging to the two prefabricated beams by the sleeve 2;
  • Step c pouring the end 3 and pouring the belt 3.
  • the sleeve 2 can be a shrink-type reinforcing steel sleeve and an outer protruding sleeve.
  • the pre-embedded reinforcing bars 13 represent all of the above. Rebar is explained.
  • the necked rebar sleeve includes a cylinder body 6 and a constriction 61 integrally connected to the two ends of the cylinder body 6.
  • the cylinder body 6 is provided with a plurality of evenly distributed grouting holes 62 for facilitating the flow of the cement slurry into the cylinder.
  • the constriction 61 is a round mouth, the inner wall of the constriction 61 is conical, and the larger end of the conical surface faces the interior of the cylinder 6; in conjunction with FIG. 47, the connection structure of the constricted rebar sleeve The pre-embedded steel bar 13 and the cylindrical body 6 are formed.
  • One end of the pre-embedded steel bar 13 is pre-embedded and fixedly connected inside the column body 11 , and the other end is exposed outside the column body 11 and an enlarged head 130 is integrally connected at an end portion away from the column body 11 .
  • the radial dimension of the outer wall of the enlarged head 130 is larger than the radial dimension of the outer wall of the embedded reinforcing bar 13 and smaller than the radial dimension of the inner wall of the constricted portion 61, and the enlarged head 130 can protrude from the constricted opening 61 into the inside of the cylindrical body 6.
  • the expanding head 130 can be fixed inside the cylindrical body 6, and the pre-embedded reinforcing bars 13 at both ends of the cylindrical body 6 can be restricted from moving away from each other.
  • the direction of motion is pulled out of the cylinder 6, so that the column bodies 11 at both ends (the schematic diagram of the rectangular block structure in which the pre-embedded reinforcing bars 13 are away from the end of the cylindrical body 6 in FIG. 48 is the column body 11) are connected, and the two column bodies 11 are raised.
  • One end of the enlarged head 130 near the pre-embedded steel bar 13 has a truncated cone shape, and one end of the enlarged head 130 near the column body 11 is smaller than the other end; for convenience of description, the conical surface of the constriction 61 is defined as a transitional conical surface 611, a constriction 61 and a cylinder The ends of the body 6 are integrally connected by the transitional conical surface 611.
  • the reaction force generated by the transitional conical surface 611 has a radial component force to the expansion head 130, and the expansion head 130 is pressed in the radial direction. Therefore, the transition cone The face 611 can cause the cylinder 6 and the concrete inside to carry a larger load, and improve the strength of the connection between the embedded steel bar 13 and the enlarged head 130 and the cylinder 6.
  • the sleeve does not need a separate grouting operation, but when the concrete is poured, the concrete slurry enters the cylinder 6 to complete the connection of the pre-embedded steel bars 13, which is more convenient and does not require special grouting. Material, saving costs.
  • the connection is more reliable than the grouting sleeve relies on the bond between the grout and the reinforcing bar.
  • the shape of the constriction 61 may be a circular shape, or may be a plurality of shapes such as a square shape, an elongated shape, and an elliptical shape, and the cross section of the enlarged head 130 is adapted to the shape of the constricted portion 61.
  • the size of the constriction 61 may be larger than the size of the expansion head 130 by 1 to 5 mm, preferably 2 to 3 mm.
  • the cylindrical body 6 has a split structure and can be split into two halves in the axial direction.
  • a connecting plate 63 is fixedly connected to the outer surface of the two end portions of the two cylinders 6.
  • the connecting plate 63 is respectively provided with a through hole 631. After the two half cylinders 6 are butt-joined together, the through holes 631 of the connecting plate 63 can be mutually connected.
  • the two connecting plates 63 can be pinned by inserting a pin or a bolt or the like into the two mutually aligned through holes 631 to restrict the two half cylinders 6 from being separated from each other in a direction away from each other.
  • the cylindrical body 6 can be split into two halves. First, half of the cylinders 6 are placed on one of the pre-embedded steel bars 13, and the other half of the cylinders 6 are sleeved on the pre-embedded steel bars 13, and finally the two-half cylinders 6 are placed in the axial direction of the pre-embedded reinforcing bars 13. And sliding in the mutually approaching direction, the through holes 631 on the connecting plate 63 are aligned with each other, and the two half cylinders 6 are joined together by the insertion of the pin member into the through hole 631.
  • the central portion of the inner wall of the cylinder 6 is fixed with a baffle member 64 that prevents the enlarged head 130 from penetrating the sleeve 2.
  • the baffle element 64 can be an intermediate wafer plate located in the barrel 6. Further, in order to allow the cement slurry to freely flow in the cylinder 6, the baffle member 64 is disposed in a hollow annular shape having an inner diameter smaller than the diameter of the enlarged head 130. Alternatively, the baffle element 64 may also be a rod disposed in the radial direction of the barrel 6.
  • the outer sleeve member includes a cylinder body 6 , a latching block 65 , and an elastic piece 66 .
  • the two ends of the tubular body 6 are respectively provided with a snap hole for inserting the latching block 65 .
  • the barrel 6 is provided with a grouting hole 62.
  • One end of the elastic piece 66 is fixedly connected to the outer side surface of the cylindrical body 6, and the other end of the elastic piece 66 is fixedly connected to one end of the engaging block 65 located outside the cylindrical body 6.
  • One end of the embedded reinforcing bar 13 is fixedly coupled to the enlarged head 130.
  • the radial dimension of the enlarged head 130 is larger than the radial dimension of the embedded reinforcing bar 13, and the enlarged head 130 can be inserted into the inside of the cylindrical body 6 from the port of the cylindrical body 6.
  • the expanding head 130 pushes the engaging block 65 to move away from the central axis of the cylindrical body 6 to elastically deform the elastic piece 66.
  • the elastic piece 66 gradually recovers and deforms into the cylindrical body 6 The reset restricts the expansion head 130 to pull out the barrel 6.
  • the cement slurry can flow from the two ports of the cylinder 6 and the grouting hole 62 into the inside of the cylinder body 6, and the solidified concrete is formed after the cement slurry solidifies, so that the embedded reinforcing steel 13 is fixed in the cylinder.
  • the inside of the body 6 is such that the connection of the two pre-embedded steel bars 13 is achieved.
  • the sleeve can adopt the four sleeve-related invention patents filed by the applicant on April 8, 2018, and the application numbers are 201810306670.4, 201810307419.X, 201810307420.2 and 201810307967.2, respectively.

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Abstract

一种预制柱/梁，包括混凝土预制柱本体（11）/梁本体（12），柱本体（11）/梁本体（12）的两端均设置有多根预埋钢筋（13），预埋钢筋（13）的一端伸出柱本体（11）/梁本体（12）的端面，预埋钢筋（13）伸出部分的端头设置有扩大头（130），扩大头（130）尺寸大于预埋钢筋（13）的直径。一种预制柱/梁的连接结构，相邻两根柱本体（11）/梁本体（12）在长度方向对接；相邻两根柱本体（11）/梁本体（12）之间设置端头后浇带（3）；分属两根预制柱/梁的预埋钢筋（13）的扩大头（130）用套筒（2）连接。一种预制柱/梁的连接结构。一种预制柱/梁结构的施工方法。该结构连接操作方便，节点牢固、抗震性能好。

Description

一种预制柱/梁及其连接结构及其施工方法 技术领域
本发明涉及一种装配式建筑结构，特别涉及一种预制柱/梁及其连接结构及其施工方法。
背景技术
现有装配式建筑结构中的使用的柱和梁大部分为钢结构，也有部分预制混凝土柱和梁。
现有预制混凝土柱和梁一般为实心结构，以预制混凝土柱为例说明。柱的顶部设置有向上伸出的钢筋，柱的底部预埋有灌浆套筒，上下层预制混凝土柱之间主要采用灌浆套筒连接。
如图54和图55所示，灌浆套筒包括两端开口的套筒和安装在套筒侧壁上的进浆口101和出浆口102。套筒预埋在上柱103中，上柱的预埋筋104插入套筒内，套筒进浆口和出浆口预留在上柱的外侧。安装时，下柱105凸出的连筋106插入套筒内；构件安装定位后，将上柱和下柱的接缝107进行填塞，然后从进浆孔注入灌浆料，使钢筋与套筒结合，起到连接作用。
优点：连接钢筋插入套筒后通过灌浆使钢筋处于密封环境解决了防腐/耐久性问题、连接强度优于以上焊接和栓接的两种方式。
缺点：实际应用中，钢筋套筒灌浆连接技术存在以下问题需要改进：1.受钢筋变形、位移、安装间隙小等因素影响施工操作难度大；2.漏浆问题容易发生且无法质检；3.操作工艺复杂，需要专用设备、工具、材料、人员；4.成本高、质量难以控制；4.影响灌浆料质量的因素多(材料、水灰比、搅拌、注浆、漏浆、人员操作、应用时间等)，质量控制难度大；5.由于钢筋套筒灌浆连接技术是通过灌浆料将钢筋与套筒粘合，利用摩擦力原理与作用实现的钢筋连接。所以灌浆料作为连接介质，起到了连接质量的决定性作用，必须灌浆饱满、无漏浆、无收缩，但是，实际应用过程中特别是竖向构件连接(容易漏浆、且无法质检)很难保证连接质量，质量可控性差；连接质量的好坏直接影响钢筋的连接强度，形成无效连接(钢筋抽芯现象)，造成建筑安全隐患。
灌浆套筒的连接效果直接影响到上下层预制柱和相邻两根预制梁的整体性，由于灌浆套筒存在上述缺点，形成的建筑结构整体性差，抗震性低。
发明内容
本发明的目的是提供一种预制柱/梁及其连接结构，该结构连接操作方便，节点牢固、抗震性能好。
本发明的上述技术目的是通过以下技术方案得以实现的：一种预制柱/梁的连接结构，包括混凝土预制柱本体/梁本体，所述柱本体/梁本体的两端均设置有多根预埋钢筋，预埋钢筋的一端伸出柱本体/梁本体的端面，预埋钢筋伸出部分的端头设置有扩大头，扩大头尺寸大于预埋钢筋的直径；相邻两根柱本体/梁本体在长度方向对接；相邻两根柱本体/梁本体之间设置端头后浇带；分属两根预制柱/梁的预埋钢筋的扩大头用套筒连接。
套筒包括筒体和一体连接于筒体两端的缩口，筒体上开设有若干个注浆孔；扩大头伸入套筒内部后，浇筑端头后浇带混凝土，混凝土浆液从注浆孔中流入筒体内，水泥浆凝固后，扩大头被固定在筒体内部，可以限制预埋钢筋拔出，从而将两端的预制柱/梁连接成整体。
通过以上技术方案，将相邻的预制柱/梁很好地连接在一起，提高了柱/梁的整体性，而且套筒连接结构采用卯榫原理，将钢筋接头的拉力转化为对筒体的混凝土的压力，进而传导至筒体上，连接更加牢固，解决了现有技术柱/梁连接整体性和抗震性差的问题。而且即使不安装套筒，扩大头本身也能够加强与后浇带混凝土的连接。
进一步地，柱本体/梁本体侧面开设连接孔的侧面开设连接孔，插接筋插入连接孔中，将位于柱本体两侧的预制墙板进行连接，或将梁本体与位于其顶部的预制墙板连接，使所有预制构件有效连接，形成整体，提高了抗震性能。
进一步地，柱本体/梁本体侧面预埋连接钢筋，并设置成扩大头，能够实现与其它构件采用套筒连接，使连接更加方便，连接效果更好。
进一步地，柱本体/梁本体侧面预埋U形筋，其与相邻构件上的预制U形连接筋交叉连接后，形成重叠区，重叠区内插入钢筋，增强了连接效果。
进一步地，预制柱/梁设置成空心结构，减轻了自重；
进一步地，两圈钢筋的设置，并将两圈钢筋钢筋相互连接，形成网架结构，从而提高了预制柱/梁的抗拉、抗压、抗弯和抗剪性能，地震时更不容易被破坏。
进一步地，内部设置预应力钢筋，提高了抗弯性能，使预制梁能适用于更大跨度的建筑，预制柱能够适用于净空更高的结构。
进一步地，在柱本体/梁本体上设置预埋钢板、预埋角铁和螺栓套筒等，方便了安装，而且更加安全。
进一步地，预埋钢筋伸出预制柱本体顶面的端头设置有扩大头，伸出预制柱本体底 面的端头向内或向外弯折形成支脚；预制柱本体埋入地下，作为基础预制柱；该基础预制柱施工速度快，安装精度高。
进一步地，预埋钢筋伸出预制柱本体顶面的端头开设有丝扣，螺母拧入丝扣后将端头变为扩大头，使得扩大头的加工更加灵活。
本发明的另一个目的是提供一种预制柱/梁的连接结构的施工方法，该方法安装步骤简单，施工高效，施工而成的结构牢固，抗震性好。
本发明的上述技术目的是通过以下技术方案得以实现的：一种基础预制柱/梁的施工方法，包括以下安装步骤：步骤a、将两根预制梁或两根预制柱沿长度方向对位；步骤b、用套筒将分属两根预制柱预埋钢筋的扩大头连接固定；步骤c、浇筑端头后浇带。
通过采用上述技术方案，预制柱/梁预埋钢筋的连接更加方便，不需要进行单独的灌浆操作，施工高效，而且连接效果好；提高了柱/梁结构的整体性和抗震性。
综上所述，本发明具有以下技术效果：
1、预制柱/梁具有更好地结构，各方面受力性能显著提高，可以适用于大跨度，高净空，强压力等特殊的建筑要求；
2、扩大头和套筒的配合连接，形成一种卯榫结构，改变了受力结构，从而使相邻的预制柱/梁实现了更好地连接，整体性高，抗震性好；
3、安装操作简单，不需要单独的灌浆工序，节约灌浆料，而且套筒安装时受钢筋位置影响小，套筒有活动量，不需完全对位，因此施工高效，经济高效。
附图说明
图1是预制柱/梁结构示意图；
图2是设置端头后浇带的两个预制柱/梁连接结构示意图；
图3是预制柱的截面为正方形示意图；
图4是预制柱的截面为圆形示意图；
图5是预制柱的截面为长方形带双孔结构示意图；
图6是圆柱空心结构示意图；
图7是方柱圆空心结构示意图；
图8是方柱方形空心结构示意图；
图9是设置双层筋的空心柱结构示意图；
图10是设置双层筋和箍筋的方柱结构示意图；
图11是设置双层筋的方形空心方柱结构示意图；
图12是设置双层钢筋网架圆柱结构示意图；
图13是设置双层钢筋网架方柱结构示意图；
图14是设置小空心的圆柱结构示意图；
图15是空心柱内浇筑混凝土的连接结构示意图；
图16是盲孔内浇筑混凝土的连接结构示意图；
图17是空心内设置加强筋的连接结构示意图；
图18是设置预应力钢筋的预制柱结构示意图；
图19是设置预应力钢筋的预制梁结构示意图；
图20是预制柱和预制梁连接结构示意图；
图21是端头设置预埋铁板的预制柱的结构示意图；
图22是底面设置预埋铁板和螺栓套筒的预制梁的结构示意图；
图23是端头设置预埋角铁的预制柱的结构示意图；
图24是端头设置螺栓套筒的预制柱的结构示意图；
图25是预制柱和预制梁螺栓套筒连接结构示意图一；
图26是预制柱和预制梁螺栓套筒连接结构示意图二；
图27是侧面设置U形连接筋的预制柱结构示意图；
图28是四周面设置U形连接筋的预制柱结构示意图；
图29是预制柱与周围预制墙板的连接结构示意图；
图30是设置U形连接筋的预制柱与一字型预制墙板的连接结构示意图；
图31是设置U形连接筋的预制柱与L型预制墙板的连接结构示意图；
图32是侧面设置有连接钢筋的预制柱结构示意图；
图33是侧面设置有连接钢筋的预制柱结构截面图；
图34是侧面设置有连接钢筋的预制柱与十字型预制墙板的连接结构示意图；
图35是侧面设置有连接钢筋的预制柱与T字型预制墙板的连接结构示意图；
图36是侧面设置有连接钢筋的预制柱与L型预制墙板的连接结构示意图；
图37是侧面设置有连接孔的预制柱结构示意图；
图38是侧面设置有连接孔的预制柱与十字型预制墙板的连接结构示意图；
图39是侧面设置有连接孔的预制柱与T字型预制墙板的连接结构示意图；
图40是侧面设置有连接孔的预制柱与L型预制墙板的连接结构示意图；
图41是一侧设置U形连接筋一侧设置连接钢筋的预制柱与预制墙板连接结构示意图；
图42是基础预制柱的结构示意图；
图43是基础预制柱放入基坑内的安装示意图；
图44是基础预制柱与上部预制柱的连接结构示意图；
图45是缩口式钢筋连接套筒中筒体的结构示意图；
图46是缩口的端面示意图；
图47是套筒和连接钢筋的配合示意图；
图48是缩口式钢筋连接套筒与预制柱的连接关系示意图；
图49是分体式筒体的结构示意图；
图50是分体式筒体和预制柱的连接关系示意图；
图51是套筒与竖直状态的两根钢筋相连的结构示意图；
图52是外伸入卡件式套筒的结构示意图；
图53是外伸入卡件式套筒与连接钢筋的装配示意图；
图54是背景技术灌浆套筒整体示意图；
图55是背景技术灌浆套筒结构示意图。
附图标记：11、柱本体；12、梁本体；13、预埋钢筋；130、扩大头；131、底部连筋；14、外圈钢筋；15、内圈钢筋；16、箍筋；17、连接筋；18、预应力钢绞线；2、套筒；3、端头后浇带；31、加强筋；32、钢筋笼；33、竖向筋；41、预埋钢板；42、预埋角铁；43、螺栓套筒；44、固定螺栓；51、U形连接筋；52、连接钢筋；53、连接孔；54、插接筋；6、筒体；61、缩口；611、过渡圆锥面；62、注浆孔；63、连接板；631、通孔；64、隔挡元件；65、卡接块；651、卡接孔；66、弹片；7、预制墙板；71、U形筋；72、竖向后浇带；73、扩头钢筋；8、空心；81、大空心；82、小空心；83、盲孔；9、基础预制柱；91、支脚；92、基坑；
101、进浆口；102、出浆口；103、上柱；104、预埋筋；105、下柱；106、连筋；107、接缝。
具体实施方式
以下结合附图对本发明作进一步详细说明。其中相同的零部件用相同的附图标记表示。需要说明的是，下面描述中使用的词语“前”、“后”、“左”、“右”、“上”、“下”、“底面”和“顶面”指的是附图中的方向，词语“内”和“外”分别指的是朝向或远离特定部件几何中心的方向。
由于预制柱和预制梁结构类似，连接方法也基本相同，所以下文中，主要用预制柱 进行举例说明。
实施例一:
(由于预制柱与预制梁结构基本相同，为了方便说明，下文中主要以预制柱进行说明，除特别要说明是预制梁时，再对预制梁作介绍)
如图1所示，一种预制柱，包括混凝土预制柱本体11，所述柱本体11的两端均设置有多根预埋钢筋13，预埋钢筋13的一端伸出柱本体11的端面，预埋钢筋13伸出部分的端头设置有扩大头130，扩大头130尺寸大于预埋钢筋13的直径。
如图2所示，相邻两根预制柱的端头之间设置端头后浇带3，两根预制柱连接时，将分属两根预制柱的预埋钢筋13的扩大头130伸入特制的套筒2内。然后浇筑端头后浇带3混凝土，并使混凝土浆液流入套筒2内，最终将两根预制柱连接成整体。
(套筒2的结构及连接方式见最后段落)
如图3-图5所示，预制柱的截面可以是正方形、长方形或圆形等；如图3-图4，预制柱沿长度方向可以是实心结构，如图5-图8，预制柱也可以沿长度方向设置成空心8结构，空心8的截面可以是方形或圆形等。空心8结构能够减轻预制柱的自重，不仅节约材料，而且方便安装。
如图5所示，空心8可以设置有多个，例如当预制柱的截面为长方形时，可以设置两个圆形空心8。
如图9-11所示，柱本体11的为空心8结构，柱本体11长度方向设置两圈钢筋。外圈钢筋14的直径大于内圈钢筋15的直径，内圈钢筋15比外圈钢筋14设置更密。柱本体11的外圈钢筋14和/或内圈钢筋15可以作为上述的预埋钢筋13，其两端伸出柱本体11的端面后，设置成扩大头130。
内圈钢筋15的设置主要对柱本体11的空心8进行了加强，使得预制柱在遇到较大外力，例如地震时，空心8结构不易遭受破坏。
进一步地，如图9与图10所示，柱本体11的外圈钢筋14和内圈钢筋15沿长度方向均设置多道箍筋16。每道外圈钢筋14的箍筋16套设在外围；内圈钢筋15的箍筋16可以只在内围设置，也可以在内、外围均设置。
如图12与图13所示，柱本体11的外圈钢筋14与内圈钢筋15用连接筋17连接成整体，形成网架结构。连接筋17可以直接与内圈钢筋15、外圈钢筋14连接，也可以将其一端与箍筋16连接。此种设置的预制柱有更好的受力结构，能够适用于截面更大、或者长度超长的预制柱的情况。
如图14所示，预制柱的截面较大时，空心8包括位于正中位置的大空心81和位于其周边的小空心82，所有空心8相互之间设有间距。大小空心的设置能够进一步减少预制柱的自重，节约材料而且方便安装。
此外，小空心82内可以穿入预应力钢绞线、预应力钢筋或预应力钢束，并在小空心82内注浆。该方案使预制柱设置成为预应力结构，有更好的抗拉拔性能。
如图15所示，柱本体11长度方向设置为空心8，相邻两根柱本体11在长度方向对接；相邻两根柱本体11之间设置端头后浇带3；分属两根预制柱预埋钢筋13的扩大头130用套筒2连接；空心8内灌注混凝土，并与端头后浇带3混凝土连接成整体。
进一步地，如图16所示，也可以在浇筑端头后浇带3混凝土前，将空心8用模板、橡胶垫等材料进行封堵，使空心8形成盲孔83结构，盲孔83内同样浇筑混凝土。
如图16与图17所示，端头后浇带3还可以设置加强筋31，加强筋31的两端分别伸入位于其两侧的柱本体11的空心8内，从而对连接节点进一步加强。
此外，还可以在端头后浇带3中，在加强筋31和预埋钢筋13周围设置箍筋16。
如图18所示，为增强预制柱的抗侧弯能力，可以在预制柱的四周设置预应力钢筋或预应力钢绞线18。
如图19所示，为增强预制梁的抗弯能力，还可以在预制梁的底部设置预应力钢筋或预应力钢绞线18。
实施例二：
如图20所示，预制柱和预制梁之间的连接结构，可以是预制梁搭接在预制柱的顶部，预制柱再搭接在两根预制梁的上表面。相互之间用套筒2连接。
如图21与图22所示，为了增强搭接效果，柱本体11端头顶面预埋钢板41，梁本体12底面设置预埋钢板41。搭接后，将钢板焊接。参考图23，也可以在柱本体11和梁本体12端头设置预埋角铁42。预埋角铁42将柱本体11包裹。搭接后，将预埋角铁42焊接。
结合图22与图24，也可以在柱本体11端头侧面预埋螺栓套筒43，梁本体12底面靠近端头处设置预埋螺栓套筒43。参考图25，梁本体12和柱本体11搭接后，用固定角铁贴在搭接拐角，然后拧入固定螺栓44，将梁本体12和柱本体11固定。此种情况，固定角铁位于预制梁的下表面。
如图26所示，也可以是在柱本体11的端面和梁本体12的端面设置预埋螺栓套筒43，固定角铁放置在柱本体11的上端面后将预制梁与预制柱用固定螺栓44连接。这种情况下，固定角铁最终浇筑在了端头后浇带3中，不需要拆卸，提高了施工效率。
实施例三：
一种预制柱，如图27与图28所示，柱本体11侧面设置U形连接筋51，U形连接筋51的开口端埋入柱本体11内；U形连接筋51可以根据其所处的拐角特点，设置成单面、双面、三面或四面。
一种预制柱的连接结构，如图29所示，还包括预制墙板7，所述预制墙板7的侧端面预埋U形筋71；预制墙板7设置于预制柱的侧面，二者之间设置竖向后浇带72；预制墙板7的预埋U形筋71与柱本体11的U形连接筋51交叉后形成重叠区，重叠区内竖向插入钢筋。这种连接结构将预制墙板7与预制柱牢牢结合成整体，所以结构稳固，抗震性能好。
当为预制梁时，U形连接筋51只设置在梁本体12的上表面即可。梁本体12上表面的U形连接筋51可以与位于其顶部的端头后浇带3中设置的钢筋进行连接。并最终浇筑在端头后浇带3中。
实施例四：
与实施例三不同之处在于，如图30所示，预制墙板7的侧端面预埋扩头钢筋73；扩头钢筋73的一端埋入预制墙板7内，另一端伸出预制墙板7，端头设置为扩大头130；两块预制墙板7的侧端面之间设置竖向后浇带72，扩头钢筋73用套筒2连接；柱本体11设置于竖向后浇带72的侧面，U形连接筋51伸入竖向后浇带72中。
如图31所示，当两块预制墙板7位于房屋拐角处时，预制柱贴向拐角的两个侧面设置U形连接筋51，U形连接筋51伸入竖向后浇带72中以后，在竖向设置钢筋笼32，钢筋笼32包括竖向筋33和箍筋16，将钢筋笼32与U形连接筋51进行交叉连接。
实施例五：
与实施例四不同之处在于，如图32与图33所示，柱本体11侧面预埋连接钢筋52；可以设置在单侧或多侧。优选地，连接钢筋52端头为扩大头130。如图34所示，两块预制墙板7的侧端面之间设置柱本体11；柱本体11与预制墙板7的侧端面之间竖向后浇带72，扩头钢筋73与连接钢筋52用套筒2连接。
如图35所示，当预制墙板7结构为T字形时，预制柱的三面设置连接钢筋52；如图36所示，当预制墙板7结构为L形时，预制柱贴于拐角的两侧设置连接钢筋52。
实施例六：
与实施例五不同之处在于，如图37所示，柱本体11的侧面开设连接孔53。连接孔53可以贯穿或不贯穿。参考图38，连接孔53中可以穿入插接筋54，插接筋54的两端均设置成扩大头130。
如图38所示，两块预制墙板7的侧端面之间设置柱本体11；柱本体11与预制墙板7的侧端面之间竖向后浇带72，插接筋54与连接钢筋52用套筒2连接。
如图39所示，当预制墙板7结构为T字形时，预制柱的三面设置连接孔53；如图40所示，当预制墙板7结构为L形时，预制柱与预制墙板7端面相对应的两个侧面设置连接孔53。
优选地，如图39与图40所示，预制柱设置有空心8时，待插接筋54插入连接孔53后，空心8内浇筑混凝土。
需要指出的是，预制柱侧面增设的连接孔53、U形连接筋51和连接钢筋52可以组合设置在同一个预制柱上，以便适应与预制墙板7不同的连接环境。如图41所示，预制柱的一个侧面设置U形连接筋51，相对的另一个侧面设置了带扩大头130的连接钢筋52。
实施例七：
结合图42与43所示，一种预制柱，与以上实施例不同之处在于，该预制柱作为基础预制柱9，相比其它实施例中的预制柱短，例如高度可以是50cm，预制柱本体11埋入地下。具体地，该基础预制柱9的预埋钢筋13伸出预制柱本体11顶面的端头设置有扩大头130，伸出预制柱本体11底面的端头向内或向外弯折形成支脚91。进一步地，如图43所示，预埋钢筋13伸出预制柱本体11顶面的端头开设有丝扣，螺母拧入丝扣后将端头变为扩大头130。
安装时，将基础预制柱9按设计位置竖直放置在基坑92内，并在基坑92底部浇筑混凝土至基础预制柱9底面以上，待混凝土初凝后即可回填基坑92。该基础预制柱9的好处是施工过程中节约时间，而且施工完成后基础柱的位置及伸出预埋钢筋13的位置精确度高。具体分析如下：现有技术对基础柱一般采用现浇施工，施工步骤包括在基坑92内安装模板、浇筑混凝土、等待混凝土强度上升、拆除模板及回填基坑92。相比现有技术，该基础预制柱9的方案省去了安拆模板的步骤，而且等待混凝土凝固时间短；此外，由于柱内竖向预埋钢筋是工厂内施工，相比现场绑扎更能保证垂直度及间距，而且不受现场浇筑混凝土时的干扰，大大提高了施工质量。
如图44所示，一种预制柱的连接结构，包括一个柱本体11和一个基础预制柱9；柱本体11底面的预埋钢筋13为底部连筋91，底部连筋91的端部为扩大头130；柱本体11位于基础预制柱9的正上方，基础预制柱9顶部的扩大头130与柱本体11的底部连筋91的扩大头130用套筒2连接。
实施例八：
一种预制柱结构的施工方法，包括以下施工步骤：
步骤a、将两根预制梁或两根预制柱沿长度方向对位；
步骤b、用套筒2将分属两根预制柱预埋钢筋13的扩大头130连接固定；预制柱长度方向设置有空心8时，在浇筑端头后浇带3混凝土前，将空心8进行封堵。
步骤c、浇筑端头后浇带3。
实施例九：
步骤a、将两根预制梁搭接在同一根预制柱的顶面，或者用底部临时支撑将预制梁支撑，使其位于预制柱顶面的两侧；
步骤b、用套筒2将分属两根预制梁的预埋钢筋13的扩大头130连接固定；
步骤c、浇筑端头后浇带3。
套筒结构及其连接方法介绍：
套筒2可以采用缩口式钢筋套筒和外伸入卡件式套筒。
(由于上文中的预埋钢筋13、连接筋17、连接钢筋52、插接筋54、底部连筋91和扩大钢筋73均设置有扩大头130，所以下文中的预埋钢筋13代表了以上所有钢筋进行说明。)
缩口式钢筋套筒：
如图45所示，缩口式钢筋套筒包括筒体6和一体连接于筒体6两端的缩口61，筒体6上开设有若干个均匀分布的注浆孔62，便于水泥浆流入筒体6内部；结合图46，缩口61为圆口，缩口61内壁为圆锥面状，圆锥面较大的一端朝向筒体6的内部；结合图47，缩口式钢筋套筒的连接结构由预埋钢筋13和筒体6组成，预埋钢筋13一端预埋固定连接在柱本体11内部，另一端露在柱本体11外面且在远离柱本体11的一端端部一体连接有扩大头130，扩大头130的外壁径向尺寸大于预埋钢筋13的外壁径向尺寸且小于缩口61的内壁径向尺寸，扩大头130可从缩口61伸入筒体6内部。
如图48所示，水泥浆从注浆孔62流入筒体6内部并且凝固形成混凝土之后，扩大头130可以被固定在筒体6内部，可以限制筒体6两端的预埋钢筋13朝相互远离的方向运动拔出筒体6，从而对两端的柱本体11(图48中预埋钢筋13远离筒体6一端的矩形块状结构为柱本体11的示意图)进行连接，提高两个柱本体11之间的连接强度。扩大头130靠近预埋钢筋13的一端为圆台面状，扩大头130靠近柱本体11的一端小于另一端；为便于叙述，缩口61的圆锥面定义为过渡圆锥面611，缩口61与筒体6端部之间通过过渡圆锥面611一体连接，在预埋钢筋13受到拔出筒体6方向的作用力之后，圆台面挤混凝土，混凝土将挤压作用力(如图48中F箭头所指的方向为作用力方向的示意图)传递给过渡圆锥面 611，过渡圆锥面611产生的反作用力对扩大头130具有沿径向的分力，沿径向压紧扩大头130，因此，过渡圆锥面611可以使筒体6和内部的混凝土承载更大的载荷，提高预埋钢筋13以及扩大头130与筒体6之间的连接强度。
与现有灌浆套筒相比，该套筒不需要单独的灌浆操作，而是在浇筑混凝土时，混凝土浆液进入筒体6即完成预埋钢筋13的连接，操作更加方便而且不需要专门的灌浆材料，节约成本。此外，由于该方案是靠压力传递，相比灌浆套筒依靠灌浆料与钢筋之间的黏结咬合，连接更加可靠。
缩口61的形状可以是圆形，也可以是方形、长条形和椭圆形等多种形状，扩大头130的截面与缩口61的形状相适配。为了使扩大头130的压力通过混凝土有效传递至筒体6上，缩口61的尺寸比扩大头130的尺寸大1～5mm即可，优选2～3mm。
如图49和图50所示，筒体6具有分体结构，可以沿轴向拆分为两半。两半筒体6相互靠近的一端外侧表面均固定连接有连接板63，连接板63上均开设有通孔631，两半筒体6相互对接拼合后，连接板63上的通孔631可相互对齐，可通过将销或螺栓等插销件同时插入两个相互对齐的通孔631内，对两个连接板63进行销接，限制两半筒体6朝相互远离的方向相互分离。
当两个柱本体11之间的距离比较小时，预埋在柱本体11内部的预埋钢筋13相互靠近的一端的端面之间的距离也比较小，可以将筒体6拆分为两半，先将其中一半筒体6套入在其中一个预埋钢筋13上，再将另一半筒体6套接在预埋钢筋13上，最后在将两半筒体6沿预埋钢筋13的轴向且朝相互靠近的方向滑动，使连接板63上的通孔631相互对齐，通过插销件插入通孔631使两半筒体6拼合在一起。
如图51所示，当连接的是竖直状态的两根钢筋时，为了将套筒2在浇筑混凝土前能够更方便地临时固定在两根预埋钢筋13的对接位置，不至于滑落。所以，筒体6内壁中部位置固接有阻止扩大头130贯穿套筒2的隔挡元件64。隔挡元件64可以是位于筒体6中间圆片板。进一步地，为了使水泥浆可以在筒体6内自由流动，隔挡元件64设置成中空的圆环状，圆环内径小于扩大头130的直径。或者，隔挡元件64也可以是沿筒体6的径向设置的一根杆件。
外伸入卡件式套筒:
如图52与图53所示，外伸入卡件式套筒包括筒体6、卡接块65、弹片66，筒体6的两端均开设有供卡接块65插接的卡接孔651，筒体6上开设有注浆孔62。弹片66一端与筒体6的外侧面相固定连接，弹片66的另一端与卡接块65位于筒体6外侧的一端相固定连接。
预埋钢筋13一端固定连接有扩大头130，扩大头130的径向尺寸大于预埋钢筋13的径向尺寸，扩大头130可从筒体6的端口插入筒体6内部。插入过程中，扩大头130推动卡接块65朝远离筒体6中心轴线的方向运动时带动弹片66发生弹性变形，在扩大头130越过卡接块65之后，弹片66逐渐恢复形变插入筒体6复位，限制扩大头130拔出筒体6。
当筒体6周围的后浇带浇筑混凝土时，水泥浆可从筒体6的两端口和注浆孔62流入筒体6内部，水泥浆凝固之后形成固态混凝土，使预埋钢筋13固定在筒体6内部，从而实现两根预埋钢筋13的连接。
此外，需要指出的是，套筒可以采用本申请人于2018年4月8号提交的4个套筒相关的发明专利，申请号分别为201810306670.4、201810307419.X、201810307420.2和201810307967.2。
本具体实施例仅仅是对本发明的解释，其并不是对本发明的限制，本领域技术人员在阅读完本说明书后可以根据需要对本实施例做出没有创造性贡献的修改，但只要在本发明的权利要求范围内都受到专利法的保护。

Claims (35)

  1. 一种预制柱/梁，其特征在于，包括混凝土预制柱本体(11)/梁本体(12)，所述柱本体(11)/梁本体(12)的两端均设置有多根预埋钢筋(13)，预埋钢筋(13)的一端伸出柱本体(11)/梁本体(12)的端面，预埋钢筋(13)伸出部分的端头设置有扩大头(130)，扩大头(130)尺寸大于预埋钢筋(13)的直径。
  2. 如权利要求1所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)侧面开设连接孔(53)，所述连接孔(53)贯穿或不贯穿。
  3. 如权利要求1所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)侧面预埋连接钢筋(52)。
  4. 如权利要求2所述的一种预制柱/梁，其特征在于，连接钢筋(52)端头为扩大头(130)。
  5. 如权利要求1所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的截面为方形或圆形。
  6. 如权利要求1所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)在长度方向为实心或空心(8)。
  7. 如权利要求6所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的空心(8)的截面为方形或圆形。
  8. 如权利要求6所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的为空心(8)，柱本体(11)/梁本体(12)长度方向设置两圈钢筋。
  9. 如权利要求8所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的外圈钢筋(14)的直径大于内圈钢筋(15)的直径。
  10. 如权利要求9所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的外圈钢筋(14)和/或内圈钢筋(15)为所述预埋钢筋(13)。
  11. 如权利要求10所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的外圈钢筋(14)和内圈钢筋(15)均设置多道箍筋(16)。
  12. 如权利要求11所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的外圈钢筋(14)与内圈钢筋(15)用连接筋(17)连接成整体，形成网架结构。
  13. 如权利要求6所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的空心(8)包括位于正中位置的大空心(81)和位于其周边的小空心(82)，所有空心(8)相互之间设有间距。
  14. 如权利要求13所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的小空 心(82)内穿入预应力钢绞线(18)、预应力钢筋或预应力钢束，并在小空心(82)内注浆。
  15. 如权利要求1所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)侧面预埋U形连接筋(51)，U形连接筋(51)的开口端埋入柱本体(11)/梁本体(12)内。
  16. 如权利要求1所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的端面或靠近端头的侧面设置预埋钢板(41)或预埋角铁(42)。
  17. 如权利要求1所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的端面或靠近端头的侧面设置预埋螺栓套筒(43)。
  18. 如权利要求1所述的一种预制柱/梁，其特征在于，柱本体(11)/梁本体(12)的长度方向设置预应力钢筋/预应力钢绞线(18)。
  19. 如权利要求1所述的一种预制柱/梁，其特征在于，预埋钢筋(13)伸出预制柱本体(11)顶面的端头设置有扩大头(130)，伸出预制柱本体(11)底面的端头向内或向外弯折形成支脚(91)；预制柱本体(11)埋入地下，作为基础预制柱(9)。
  20. 如权利要求19所述的一种预制柱/梁，其特征在于，预埋钢筋(13)伸出预制柱本体(11)顶面的端头开设有丝扣，螺母拧入丝扣后将端头变为扩大头(130)。
  21. 一种预制柱/梁的连接结构，其特征在于，包括至少两根如权利要求1-18中任意一项所述的预制柱/梁，相邻两根柱本体(11)/梁本体(12)在长度方向对接；相邻两根柱本体(11)/梁本体(12)之间设置端头后浇带(3)；分属两根预制柱/梁的预埋钢筋(13)的扩大头(130)用套筒(2)连接。
  22. 如权利要求21所述的一种预制柱/梁连接结构，其特征在于，梁本体(12)搭接在柱本体(11)的上表面。
  23. 如权利要求22所述的一种预制柱/梁连接结构，其特征在于，梁本体(12)端头的预埋钢板(41)/预埋角铁(42)与柱本体(11)端头的预埋钢板(41)/预埋角铁(42)焊接。
  24. 如权利要求22所述的一种预制柱/梁连接结构，其特征在于，还包括固定角铁，固定角铁安装在梁本体(12)与柱本体(11)搭接的拐角处，固定螺栓(44)穿过固定角铁后，拧入预埋螺栓套筒(43)。
  25. 如权利要求23所述的一种预制柱/梁连接结构，其特征在于，固定角铁位于梁本体(12)的下表面或位于柱本体(11)的上端面。
  26. 一种预制柱的连接结构，其特征在于，包括两根如权利要求1-18中任意一项所述的柱本体(11)，柱本体(11)长度方向设置为空心(8)，相邻两根柱本体(11)在长度方向对 接；相邻两根柱本体(11)之间设置端头后浇带(3)；分属两根预制柱预埋钢筋(13)的扩大头(130)用套筒(2)连接；
    空心(8)内灌注混凝土，并与端头后浇带(3)混凝土连接成整体。
  27. 如权利要求26所述的一种预制柱的连接结构，其特征在于，端头后浇带(3)设置加强筋(31)，所述加强筋(31)的两端分别伸入位于其两侧的柱本体(11)的空心(8)内。
  28. 一种预制柱的连接结构，其特征在于，包括两根如权利要求1-18中任意一项所述的柱本体(11)，柱本体(11)侧面设置U形连接筋(51)；还包括预制墙板(7)，所述预制墙板(7)的侧端面预埋U形筋(71)；预制墙板(7)设置于预制柱的侧面，二者之间设置竖向后浇带(72)；预制墙板(7)的预埋U形筋(71)与柱本体(11)的U形连接筋(51)交叉后形成重叠区，重叠区内竖向插入钢筋。
  29. 一种预制柱的连接结构，其特征在于，包括两根如权利要求1-18中任意一项所述的柱本体(11)，柱本体(11)侧面设置U形连接筋(51)；还包括预制墙板(7)，所述预制墙板(7)的侧端面预埋扩头钢筋(73)；扩头钢筋(73)的一端埋入预制墙板(7)内，另一端伸出预制墙板(7)，端头设置为扩大头(130)；两块预制墙板(7)的侧端面之间设置竖向后浇带(72)，扩头钢筋(73)用套筒(2)连接；柱本体(11)设置于竖向后浇带(72)的侧面，U形连接筋(51)伸入竖向后浇带(72)中。
  30. 一种预制柱的连接结构，其特征在于，包括两根如权利要求1-18中任意一项所述的柱本体(11)，柱本体(11)侧面预埋连接钢筋(52)；连接钢筋(52)端头为扩大头(130)；还包括预制墙板(7)，所述预制墙板(7)的侧端面预埋扩头钢筋(73)；扩头钢筋(73)的一端埋入预制墙板(7)内，另一端伸出预制墙板(7)，端头设置为扩大头(130)；两块预制墙板(7)的侧端面之间设置柱本体(11)；柱本体(11)与预制墙板(7)的侧端面之间竖向后浇带(72)，扩头钢筋(73)与连接钢筋(52)用套筒(2)连接。
  31. 一种预制柱的连接结构，其特征在于，
    包括两根如权利要求1-18中任意一项所述的柱本体(11)，柱本体(11)的侧面开设连接孔(53)；
    还包括预制墙板(7)，所述预制墙板(7)的侧端面预埋扩头钢筋(73)；扩头钢筋(73)的一端埋入预制墙板(7)内，另一端伸出预制墙板(7)，端头设置为扩大头(130)；两块预制墙板(7)的侧端面之间设置柱本体(11)；柱本体(11)与预制墙板(7)的侧端面之间竖向后浇带(72)；
    还包括穿入或贯穿连接孔(53)的插接筋(54)，插接筋(54)的两端设置成扩大头 (130)，插接筋(54)与连接钢筋(52)用套筒(2)连接。
  32. 一种预制柱的连接结构，其特征在于，包括如权利要求1-18中任意一项所述的柱本体(11)和如权利要求19或20中的基础预制柱(9)；柱本体(11)底面的预埋钢筋(13)为底部连筋(91)，底部连筋(91)的端部为扩大头(130)；柱本体(11)位于基础预制柱(9)正上方，基础预制柱(9)顶部的扩大头(130)与柱本体(11)的底部连筋(91)的扩大头(130)用套筒(2)连接。
  33. 一种预制柱/梁结构的施工方法，其特征在于，包括以下施工步骤：
    步骤a、将两根预制梁或两根预制柱沿长度方向对位；
    步骤b、用套筒(2)将分属两根预制柱预埋钢筋(13)的扩大头(130)连接固定；
    步骤c、浇筑端头后浇带(3)。
  34. 如权利要求33所述的一种预制柱/梁结构的施工方法，其特征在于，预制柱/梁长度方向设置有空心(8)，在浇筑端头后浇带(3)混凝土前，将空心(8)进行封堵。
  35. 一种预制柱/梁结构的施工方法，其特征在于，包括以下施工步骤：
    步骤a、将两根预制梁搭接在同一根预制柱的顶面；
    步骤b、用套筒(2)将分属两根预制梁的预埋钢筋(13)的扩大头(130)连接固定；
    步骤c、浇筑端头后浇带(3)。
PCT/CN2019/084136 2018-04-25 2019-04-24 一种预制柱/梁及其连接结构及其施工方法 WO2019206192A1 (zh)

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