CN113503039B - Embedded lower chord herringbone frame web member assembly truss construction method - Google Patents
Embedded lower chord herringbone frame web member assembly truss construction method Download PDFInfo
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- CN113503039B CN113503039B CN202110935698.6A CN202110935698A CN113503039B CN 113503039 B CN113503039 B CN 113503039B CN 202110935698 A CN202110935698 A CN 202110935698A CN 113503039 B CN113503039 B CN 113503039B
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- lower chord
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- herringbone frame
- truss
- chord member
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- 238000010276 construction Methods 0.000 title claims abstract description 21
- 230000008901 benefit Effects 0.000 claims abstract description 14
- 238000009417 prefabrication Methods 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 230000002787 reinforcement Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000004567 concrete Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 230000007547 defect Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 abstract description 6
- 238000003892 spreading Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 210000002435 tendon Anatomy 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 239000011178 precast concrete Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
-
- 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
Abstract
The invention relates to an embedded lower chord herringbone frame web member assembly truss construction method, which comprises the following steps: (1) Simultaneously prefabricating a herringbone frame, an upper chord, an embedded lower chord and an end rod in parallel in a prefabricating factory; (2) Assembling the herringbone frame and the embedded lower chord member, placing the embedded lower chord member into an embedded space of a first end frame body at the lower part of the herringbone frame, and injecting post-positioned slurry into a gap between the herringbone frame and the lower chord member to form an assembled herringbone frame web member; (3) Spreading the upper chord member on the herringbone frame, placing the second end of the upper part of the herringbone frame into the hole of the upper chord member, and wedging the end of the herringbone frame by adopting a wedging body; (4) The reinforcement is put into the embedded lower chord member body, and the lower chord member is tensioned by tensioning the reinforcement; (5) And hoisting the embedded lower chord web member assembly type truss to a required position. The embedded lower chord web member assembly truss construction method adopts the methods of split prefabrication and field assembly, is convenient for transportation and storage in a storage yard, saves cost, improves convenience, greatly reduces construction period, brings economic benefit, has wide application prospect, and has great pushing effect on the development of assembly buildings.
Description
Technical Field
The invention relates to the technical field of concrete structures in civil engineering, in particular to an assembled truss and a construction method thereof, and specifically relates to an assembled truss construction method of an embedded lower chord web member.
Background
Fabricated concrete structures have become a mainstream trend in the industry at present, the production and manufacture of precast concrete members occupy important positions, and trusses are commonly used in structural forms, and the precast concrete trusses are widely applied in engineering as building, roof structures, bridge structures and the like. However, the whole precast concrete truss not only occupies a larger space due to the huge outline size, is limited by transportation and is manufactured on site, but also has the defects of the whole precast concrete truss, namely, the storage space required by the whole prefabrication of the truss, and the complicated reinforcement, the complicated die system and the expensive cost of the truss, even if compared with a solid beam, the saving of truss materials is offset by the complicated advantages caused by the die cost and the complicated reinforcement. In addition, when the truss span is larger, the on-site open-air cast-in-place production is also influenced by typhoons, heavy rain, low-temperature weather and other factors, and the progress is also influenced. Practice proves that: the truss is used as a traditional construction method for whole prefabrication, so that the construction period and the cost are influenced, the construction period cost is increased, and the advantages of the assembled structure are difficult to embody.
Therefore, further innovative thinking is needed to solve this problem.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an embedded lower chord herringbone frame web member assembly truss construction method which can be quickly and conveniently manufactured and transported and improves the applicability and the universality of engineering application.
In order to achieve the above purpose, the construction method of the embedded lower chord herringbone frame web member assembly truss adopts the following technical scheme:
the embedded lower chord member web member assembly truss comprises an upper chord member, a web member and an embedded lower chord member, wherein the web member is arranged above the embedded lower chord member and connected with the embedded lower chord member, the upper chord member is arranged above the web member and connected with the web member, the web member comprises at least two prefabricated herringbone frames assembled by taking a single herringbone frame as a basic unit, and the tail end of the herringbone frame body is coated with the embedded lower chord member.
The 'Y' -shaped frame, the inverted 'V' -shaped frame and the like are commonly referred to as a 'Y' -shaped frame, an inverted 'V' -shaped frame and the like after being inverted, and the 'Y' -shaped frame, the inverted 'V' -shaped frame and the like are all commonly referred to as the 'Y' -shaped frame in the invention, and the 'Y' -shaped frame is made of concrete, steel or steel-concrete composite materials.
The herringbone frame is integrated, is provided with a first tail end and a second tail end, and comprises a first limb and a second limb, the axes of the first limb and the second limb are set to be set angles, and the upper ends of the first limb and the second limb are connected into a whole.
The herringbone frames are arranged along the axial direction of the upper chord member and the embedded lower chord member, and the end parts of the adjacent herringbone frames are abutted.
The herringbone frame, the upper chord member and the embedded lower chord member form a vertical truss together, the herringbone frame is used as the web member of the truss to be integrally sheared (the first limb and the second limb are only stressed by the axial force), the upper chord member is horizontally stressed, and the lower chord member is used as the lower (horizontal) tension chord member. While the truss form saves material and reduces dead weight over a solid beam relative to an integrally prefabricated truss, the mold required for prefabrication is complex and expensive, as well as the complexity of the overall truss reinforcement, such that the aforementioned advantages of the truss are partially offset. The web members of the truss are decomposed into simple basic units, the repetition rate is high, the die cost is saved, the reinforcement is standardized and simplified, the advantages of the solid girder and the integral truss are integrated, the defects of the solid girder and the integral truss are abandoned, and the web members are the optimized conception. Moreover, the form of the propeller strut has both overall advantages and convenience advantages in installation, with respect to the complexity of unstable and complex and difficult to control in the case of the disassembly of the truss web into individual tension or compression bars, and is therefore the optimal concept.
Further, the first end of the lower part of the herringbone frame body is provided with an embedded space (opening) for placing the embedded lower chord member, the inner side of the embedded space (close to the lower chord member) is provided with an anti-slip protrusion for preventing the embedded lower chord member from being separated from the herringbone frame, and the anti-slip protrusion is in a prismatic shape, a block shape, a dot shape or a bolt shape.
Further, the bolt-shaped anti-slip protrusions are arranged in an assembled mode, one end of each bolt-shaped anti-slip protrusion is placed in the herringbone frame body, the other end of each bolt-shaped anti-slip protrusion is exposed and is called an exposed end, the exposed end of each bolt-shaped anti-slip protrusion is arranged in an embedded space of the herringbone frame, rear slurry is arranged in a gap between the embedded lower chord member and the herringbone frame, the embedded lower chord member is connected with the herringbone frame, and the rear slurry is achieved through a grouting method.
Optionally, an anti-slip groove is provided on the inner side of the first end of the bottom of the herringbone frame, which is close to the bottom chord, for preventing the embedded bottom chord from separating from the herringbone frame, and the anti-slip groove is prismatic, massive, punctiform or bolt-shaped.
The lower chord member is embedded, and the embedded lower chord member is coated at the first tail end of the lower part of the herringbone frame.
Further, the lower chord member is arranged as a hollow pipe body. The pipe body material is concrete, steel or steel concrete composite material.
Furthermore, the pipe body is additionally provided with a tendon body, the tendon body can apply prestress to stretch the lower chord member, the tendon body is made of steel, carbon fiber or high-strength engineering material, and the steel tendon body is made of steel bars and prestress tendons (steel strands, steel wires or prestress screw bars, and the like).
The upper chord member is internally provided with a hole, and the second end of the upper part of the herringbone frame is arranged in the hole of the upper chord member. The upper chord member is made of concrete, steel or steel concrete composite materials.
Further, the upper chord member and the lower chord member are arranged in a sectional mode, the chord member of each section is arranged as a chord section, a transverse hole is formed in the chord section of the upper chord member, and the second tail end of the upper part of the propeller strut is arranged in the transverse hole of the chord section. The chord section is a portion of the chord.
Furthermore, the embedded lower chord member is provided with an anti-slip key at the joint part with the herringbone frame to prevent the sliding of the lower end of the herringbone frame and the embedded lower chord member, the anti-slip key is in a strip shape, a block shape, a dot shape or a bolt shape, and the material is concrete, steel, a steel concrete composite material, a chemical material or wood. The anti-slip key and the embedded lower chord member are integrally arranged, or are formed by split assembly or direct connection.
Furthermore, the embedded lower chord member is provided with an anti-skid bolt at the joint part with the herringbone frame, and the anti-skid bolt is arranged to be assembled and directly penetrates through the embedded lower chord member body and the tail end of the herringbone frame body.
Optionally, the embedded bottom chord member be provided with anti-skidding recess in the position with the cross of herringbone frame, be provided with rearmounted thick liquids in the anti-skidding recess, prevent the slip of herringbone frame lower extreme and embedded bottom chord member, anti-skidding recess shape be prismatic, cubic, punctiform or bolt form.
Further, a wedging body is arranged between the second end of the upper part of the herringbone frame and the inner opening of the upper chord member, and the wedging body is a rear slurry body, a wedge body and the like.
The end part of the embedded lower chord member herringbone frame web member assembly truss is provided with an end rod connected with the upper chord member and the embedded lower chord member to bear the pressure of the support, the end rod is vertically arranged, and the herringbone frame, the embedded lower chord member and the end rod are arranged in a vertical plane.
The construction method of the embedded lower chord herringbone frame web member assembly truss comprises the following steps of:
the first step: simultaneously prefabricating a herringbone frame, an upper chord, an embedded lower chord and an end rod in parallel in a prefabricating factory;
and a second step of: the prefabricated components are transported to an assembly site, firstly, a herringbone frame and an embedded lower chord are assembled, the embedded lower chord is placed in an embedded space of a first end frame body at the lower part of the herringbone frame, and post-arranged slurry is injected into a gap between the herringbone frame and the lower chord, so that the herringbone frame and the lower chord are fixed, and an assembled herringbone frame web member is formed;
and a third step of: spreading the upper chord member on the herringbone frame, placing the second end of the upper part of the herringbone frame into the hole of the upper chord member, and wedging the end of the herringbone frame by adopting a wedging body;
fourth step: placing a rib body into the embedded lower chord member body, and stretching the rib body so as to tension the lower chord member;
fifth step: and hoisting the assembled and integrated embedded lower chord herringbone frame web member assembly type truss to a required position.
Compared with the existing truss, the embedded lower chord herringbone frame web member assembly truss has the following advantages:
1. the web member of the herringbone frame takes a single herringbone frame as a basic unit, the prefabrication repetition rate is greatly improved, the advantages and the strength of prefabrication assembly are exerted, the steel mould used in prefabrication of the integral concrete truss is more complex than that of a solid beam and the cost is greatly increased, after the web member of the herringbone frame is adopted, the steel mould used in prefabrication becomes extremely simple and the cost is obviously reduced, compared with the integrally prefabricated concrete truss, the cost of the steel mould is reduced from a million-element level to a thousand-element level and a hundred-element level, the disadvantage that the cost of the prefabricated steel mould is large is completely improved, and the application and popularization of prefabrication assembly are facilitated;
2. the cost of the steel mould of the chord section is reduced, and the construction convenience and the rapidness are as obvious as those of the herringbone frame;
3. the storage and transportation cost of the embedded lower chord web member assembly truss is greatly reduced, and the convenience is obviously improved;
4. in the on-site truss assembly, as the individual segments reach the strength in advance, the truss assembly work can be still carried out in severe environments such as rainy days, low temperature and the like under the condition that only partial rainproof measures (such as that workers put on umbrellas or wear rain capes) are needed, and the construction speed is increased.
In a word, the embedded lower chord web member fabricated truss can save cost, shorten construction period (the construction period is the cost in many times), improve efficiency, improve construction convenience, and make the prefabricated fabricated truss have wider application prospect and be more suitable for being the optimal choice of fabricated buildings.
Drawings
Fig. 1 is a side elevation view of the propeller strut of the present invention.
Fig. 2 is a side elevation view of the assembled position of the propeller strut of the present invention.
Fig. 3 is a longitudinal section of the propeller strut of the present invention assembled with an upper chord and an embedded lower chord.
FIG. 4 is a cross-sectional view of the present invention after the propeller strut is assembled with the upper chord and the embedded lower chord.
FIG. 5 is a cross-sectional view of the embedded bottom chord and the propeller strut of the present invention in positional relationship.
FIG. 6 is a longitudinal cross-sectional view of the embedded bottom chord and the propeller strut of the present invention in position.
FIG. 7 is a horizontal cross-sectional view of the positional relationship of the embedded bottom chord and the propeller strut of the present invention.
Reference numerals:
1. herringbone frame
11. First limb part
12. Second limb
13. Anti-slip boss
14. Embedded space
141. Anti-slip groove
2. Upper chord
3. Embedded lower chord
31. Rib body
32. Anti-slip key
4. End rod
5. Post-slurry
Detailed Description
In order to make the technical contents of the present invention more clearly understood, the following examples are specifically described.
Referring to fig. 1 to 7, the assembled truss for the web member of the embedded lower chord member includes a herringbone frame 1, an upper chord member 2, an embedded lower chord member 3, and an end member 4. The web member of the herringbone frame 1 is arranged above the embedded lower chord member 3 and is connected with the embedded lower chord member 3, the upper chord member 2 is arranged above the web member of the herringbone frame 1 and is connected with the web member of the herringbone frame 1, the end rod 4 is connected with the upper chord member 2 and the embedded lower chord member 3, and the herringbone frame 1, the embedded lower chord member 3 and the end rod 4 are arranged in a vertical plane. The web member of the herringbone frame 1 comprises a plurality of prefabricated herringbone frames 1, and the herringbone frames 1 are assembled by taking the herringbone frames 1 as basic units. The herringbone frame 1 is an integral body and comprises a first limb 11 and a second limb 12, the axes of the first limb 11 and the second limb 12 are set to be set angles, and the upper ends of the first limb 11 and the second limb 12 are connected into an integral body. The utility model provides a double-sided bridge, including double-sided bridge 1, embedded bottom chord 3, double-sided bridge 1, inner chord 3, outer chord 3 and inner chord 3, double-sided bridge 1 lower extreme be provided with non-slip protrusion 13, embedded bottom chord 3's cavity body in be provided with muscle body 31, embedded bottom chord 3 be provided with anti-slip key 32, the frame of the second end of double-sided bridge 1 in be provided with embedded space 14, the inside anti-slip groove 141 that is provided with of embedded space 14, embedded bottom chord 3 and double-sided bridge 1 in be provided with post-positioned thick liquid 5.
Example 1
The first step: simultaneously prefabricating a herringbone frame, an upper chord, an embedded lower chord and an end rod in parallel in a prefabricating factory;
and a second step of: the prefabricated components are transported to an assembly site, firstly, a herringbone frame and an embedded lower chord are assembled, the embedded lower chord is placed in an embedded space of a first end frame body at the lower part of the herringbone frame, and post-arranged slurry is injected into a gap between the herringbone frame and the lower chord, so that the herringbone frame and the lower chord are fixed, and an assembled herringbone frame web member is formed;
and a third step of: spreading the upper chord member on the herringbone frame, placing the second end of the upper part of the herringbone frame into the hole of the upper chord member, and wedging the end of the herringbone frame by adopting a wedging body;
fourth step: placing a rib body into the embedded lower chord member body, and stretching the rib body so as to tension the lower chord member;
fifth step: and hoisting the assembled and integrated embedded lower chord herringbone frame web member assembly type truss to a required position.
The embedded lower chord herringbone frame web member assembly truss provided by the invention adopts the methods of split prefabrication and field assembly, is convenient for transportation and storage in a storage yard, saves cost, improves convenience, greatly reduces construction period, brings economic benefit, has wide application prospect, and has great pushing effect on the development of assembly type buildings.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent, however, that various modifications and changes may be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (4)
1. The utility model provides an embedded lower chord member web member assembled truss construction method which is characterized in that the embedded lower chord member web member assembled truss comprises an upper chord member, a web member and an embedded lower chord member, wherein the web member is arranged above the embedded lower chord member and is connected with the embedded lower chord member, the upper chord member is arranged above the web member and is connected with the web member, the web member comprises at least two prefabricated webs, the single web is used as a basic unit for assembly, and the tail end of the web is coated with the embedded lower chord member;
the herringbone frame is made of concrete, is integrally prefabricated, forms a vertical truss together with the upper chord member and the embedded lower chord member, is integrally provided with a first tail end and a second tail end, comprises a first branch and a second branch, the axes of the first branch and the second branch are set to be preset angles, the upper ends of the first branch and the second branch are connected into a whole, and the herringbone frame is arranged along the axial direction of the upper chord member and the embedded lower chord member, and is abutted against the end parts of the adjacent herringbone frames; the herringbone frame is used as a web member of the truss to be sheared integrally, the first branch limb and the second branch limb are only stressed by an axial force, the upper chord member is pressed horizontally, and the lower chord member is used as a lower horizontal tension chord member; compared with an integrally prefabricated truss, the truss type truss saves materials and reduces dead weight compared with a solid truss, but the die required by prefabrication is complex and expensive, and the complexity of the integral truss reinforcement is high, so that the advantages of the truss are partially offset, the web members of the truss are decomposed into simple basic units by adopting the web members of the herringbone frame, the repetition rate is high, the die cost is saved, the reinforcement is standardized and simplified, the advantages of the solid truss and the integral truss are integrated, and the defects of the solid truss and the integral truss are abandoned; compared with the complexity that the truss web members are disassembled into single tension or compression rods, the truss web members are unstable and complex to control during installation, and the form of the propeller strut has the overall advantages and the convenience advantage during installation;
the inner side of the embedded space of the frame body at the first end of the lower part of the herringbone frame is provided with an anti-slip protrusion, or the inner side of the embedded space of the frame body at the first end of the lower part of the herringbone frame is provided with an anti-slip groove; a rear slurry is arranged in a gap between the embedded space at the first end of the lower part of the herringbone frame and the embedded lower chord and used for connecting the herringbone frame and the embedded lower chord together; the embedded lower chord member is provided with an anti-slip key or an anti-slip groove at the joint part with the herringbone frame;
the embedded lower chord member is arranged as a hollow pipe body; a rib body is additionally arranged in the pipe body and used for applying prestress to stretch the embedded lower chord; the second end of the upper part of the herringbone frame is arranged in the hole of the upper chord;
the construction method comprises the following steps:
the first step: simultaneously prefabricating the herringbone frame, the upper chord and the embedded lower chord and the end rod in parallel in a prefabricating factory;
and a second step of: the prefabricated components are transported to an assembly site, the herringbone frame and the embedded lower chord member are assembled, the embedded lower chord member is placed in an embedded space of a first end frame body at the lower part of the herringbone frame, and post-arranged slurry is injected into a gap between the herringbone frame and the lower chord member, so that the herringbone frame and the lower chord member are fixed, and an assembled herringbone frame web member is formed;
and a third step of: the upper chord member is paved on the herringbone frame, the second end of the upper part of the herringbone frame is placed into the hole of the upper chord member, and the end of the herringbone frame is wedged by adopting a wedging body;
fourth step: placing a rib into the embedded lower chord member body, and tensioning the rib so as to tension the lower chord member;
fifth step: and hoisting the assembled and integrated embedded lower chord herringbone frame web member assembly type truss to a required position.
2. The method for constructing the assembled truss of the web member of the embedded lower chord member of claim 1, wherein the upper chord member and the lower chord member are arranged in a sectional manner, the chord member of each section is arranged as a chord section, holes are formed in the chord section of the upper chord member, and the second tail end of the upper part of the herringbone frame is arranged in the holes of the chord section of the upper chord member.
3. The method for constructing the embedded lower chord web member assembly type truss according to claim 1, wherein the end part of the embedded lower chord web member assembly type truss is provided with an end rod for connecting the upper chord and the lower chord, the end rod is vertically arranged, and the herringbone frame, the embedded lower chord and the end rod are arranged in a vertical plane.
4. A method of constructing an in-line bottom chord web member fabricated truss as claimed in any one of claims 1 to 3 wherein the in-line bottom chord is provided with a cleat at the location of the intersection with the web, the cleat being fabricated and extending directly through the in-line bottom chord and the web.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110935698.6A CN113503039B (en) | 2021-08-16 | 2021-08-16 | Embedded lower chord herringbone frame web member assembly truss construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110935698.6A CN113503039B (en) | 2021-08-16 | 2021-08-16 | Embedded lower chord herringbone frame web member assembly truss construction method |
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| CN113503039A CN113503039A (en) | 2021-10-15 |
| CN113503039B true CN113503039B (en) | 2023-12-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050225172A1 (en) * | 2004-04-12 | 2005-10-13 | Lionel Brightwell | Open web trimmable truss with self locking joint |
| US20180002925A1 (en) * | 2015-02-16 | 2018-01-04 | Yong Keun KWON | Composite beam having truss reinforcement embedded in concrete |
| CN107605100A (en) * | 2017-10-19 | 2018-01-19 | 精工工业建筑系统有限公司 | A kind of assembling truss purlin system and manufacture craft |
| CN111139958A (en) * | 2020-02-24 | 2020-05-12 | 吴美君 | Building floor heat preservation and sound insulation system and construction method thereof |
| CN212317492U (en) * | 2020-01-14 | 2021-01-08 | 福建建工集团有限责任公司 | Vertical pre-buried threading pipe structure in roof beam of conveniently taking over |
-
2021
- 2021-08-16 CN CN202110935698.6A patent/CN113503039B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050225172A1 (en) * | 2004-04-12 | 2005-10-13 | Lionel Brightwell | Open web trimmable truss with self locking joint |
| US20180002925A1 (en) * | 2015-02-16 | 2018-01-04 | Yong Keun KWON | Composite beam having truss reinforcement embedded in concrete |
| CN107605100A (en) * | 2017-10-19 | 2018-01-19 | 精工工业建筑系统有限公司 | A kind of assembling truss purlin system and manufacture craft |
| CN212317492U (en) * | 2020-01-14 | 2021-01-08 | 福建建工集团有限责任公司 | Vertical pre-buried threading pipe structure in roof beam of conveniently taking over |
| CN111139958A (en) * | 2020-02-24 | 2020-05-12 | 吴美君 | Building floor heat preservation and sound insulation system and construction method thereof |
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| CN113503039A (en) | 2021-10-15 |
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