CN112411746A - Primary and secondary beam cross lap joint structure and connection method thereof - Google Patents
Primary and secondary beam cross lap joint structure and connection method thereof Download PDFInfo
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- CN112411746A CN112411746A CN202011359283.0A CN202011359283A CN112411746A CN 112411746 A CN112411746 A CN 112411746A CN 202011359283 A CN202011359283 A CN 202011359283A CN 112411746 A CN112411746 A CN 112411746A
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- prefabricated
- secondary beam
- primary
- prefabricated secondary
- lap joint
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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
- E04B1/21—Connections specially adapted therefor
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- 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
Abstract
The invention discloses a primary and secondary beam cross lap joint structure and a connecting method thereof, wherein the connecting structure comprises a prefabricated primary beam and a prefabricated secondary beam which are formed by pouring concrete, and the cross lap joint structure is characterized in that a notch is formed in the prefabricated primary beam, the prefabricated secondary beam comprises a first prefabricated secondary beam and a second prefabricated secondary beam which are connected through a plurality of steel bars, the steel bars at the lower layer of the prefabricated secondary beam are supported at the bottom of the notch, and a concrete pouring cavity is defined by the first prefabricated secondary beam, the second prefabricated secondary beam and the notch. According to the invention, the joint at the lap joint of the primary and secondary beams is processed, so that the problems of blockage and the like generated when the sleeve is installed are avoided, the structural safety is improved, and the assembly difficulty is reduced. Furthermore, the connection mode reduces the overlapping of the prefabricated secondary beam steel bars, reduces the consumption of the steel bars and accords with the sustainable development concept. Meanwhile, the mode that the main reinforcements of the main beam are not disconnected and all the reinforcements of the secondary beam are not disconnected is adopted, so that the connection strength of the prefabricated secondary beam is improved, and the safety of the whole structure is guaranteed greatly.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a primary and secondary beam cross lap joint connecting structure and a connecting method thereof.
Background
In the fabricated building, the hoisting of the main and secondary beams of the prefabricated part is mainly carried out by a tower crane, so that a large amount of working time of the tower crane is occupied. If the hoisting time is too long, the waiting time of other procedures is infinitely prolonged.
The pre-buried sleeve on the girder is adopted to current primary and secondary roof beam connected node, and the reinforcing bar is twisted in the later stage and secondary roof beam reinforcing bar carries out the lapped mode, mainly has following problem:
firstly, the sleeve is easy to block when the component is prefabricated, so that the steel bar cannot be screwed in, a large amount of time is wasted, and the structure safety cannot be ensured;
and secondly, a large amount of steel bars can be wasted by adopting a steel bar lap joint mode, and the material saving and environmental protection are not facilitated.
Disclosure of Invention
The invention aims to provide a primary and secondary beam cross lap joint structure and a method thereof, so as to solve the problems.
In order to achieve the purpose, the invention firstly discloses a primary and secondary beam cross lap joint structure which comprises a prefabricated primary beam and a prefabricated secondary beam which are formed by concrete pouring, wherein a notch is formed in the prefabricated primary beam, the prefabricated secondary beam comprises a first prefabricated secondary beam and a second prefabricated secondary beam which are connected through a plurality of steel bars, the steel bars on the lower layer of the prefabricated secondary beam are supported at the bottom of the notch, and a concrete pouring cavity is defined by the first prefabricated secondary beam, the second prefabricated secondary beam and the notch.
Furthermore, the distance between the notch and the two side faces of the prefabricated secondary beam is larger than 10 mm.
Furthermore, threaded sleeves are pre-embedded in the two side faces of the prefabricated main beam, which are located on the gap, and the opposite side faces of the first prefabricated secondary beam and the second prefabricated secondary beam, and the threaded sleeves are connected and supported by profile steel.
Furthermore, the opposite surfaces of the first prefabricated secondary beam and the second prefabricated secondary beam are provided with shear grooves.
Furthermore, the diameter of the lower layer of steel bars between the first prefabricated secondary beam and the second prefabricated secondary beam is larger than that of the upper layer of steel bars.
Then, the invention discloses a primary and secondary beam cross lap joint method, which comprises the primary and secondary beam cross lap joint structure of the scheme, and comprises the following steps:
s1, installing jacks in the prefabricated main beams, wherein two ends of each jack are supported on two sides of the notch;
s2, after the prefabricated main beam is hoisted to a preset position, the jack is removed;
s3, mounting the jack on the opposite surfaces of the first prefabricated secondary beam and the second prefabricated secondary beam;
s4, hoisting the prefabricated secondary beam, and supporting the steel bar at the joint of the first prefabricated secondary beam and the second prefabricated secondary beam at the bottom of the notch;
s5, removing a jack between the first prefabricated secondary beam and the second prefabricated secondary beam;
s6, formwork supporting treatment is carried out outside the concrete pouring cavity;
and S7, pouring concrete into the concrete pouring cavity, and removing the formwork after the concrete reaches the preset strength.
And further, before the jack is installed, the section steel installed on the prefabricated main beam and the prefabricated secondary beam is removed.
Compared with the prior art, the invention has the advantages that:
according to the invention, the joint at the lap joint of the primary and secondary beams is processed, so that the problems of blockage and the like generated when the sleeve is installed are avoided, the structural safety is improved, and the assembly difficulty is reduced. Furthermore, the connection mode reduces the overlapping of the prefabricated secondary beam steel bars, reduces the consumption of the steel bars and accords with the sustainable development concept. Simultaneously, the main girder main reinforcement does not break off, and the joint strength of prefabricated secondary beam has been promoted to the mode that all reinforcing bars of secondary beam do not break off, and holistic structure safety obtains bigger guarantee.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic view of a prefabricated girder installation jack according to the disclosure of the preferred embodiment of the present invention;
FIG. 2 is a schematic view of the prefabricated main beam with the jacks removed after the hoisting is completed according to the preferred embodiment of the present invention;
FIG. 3 is a schematic view of a prefabricated secondary beam installation jack disclosed in a preferred embodiment of the present invention;
FIG. 4 is a schematic view of the connection of the prefabricated main beams and the prefabricated secondary beams disclosed by the preferred embodiment of the invention;
fig. 5 is a flow chart of the connection of the prefabricated main beams and the prefabricated secondary beams disclosed by the preferred embodiment of the invention.
Illustration of the drawings:
1. prefabricating a main beam; 11. a notch; 12. a threaded sleeve;
2. prefabricating a secondary beam; 21. a first precast secondary beam; 22. a second precast secondary beam; 23. reinforcing steel bars; 24. a shear resistant groove;
3. pouring concrete into the cavity;
4. a jack;
5. section steel.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1-5, the invention firstly discloses a cross lap joint structure of a primary and secondary beam, comprising a prefabricated primary beam 1 and a prefabricated secondary beam 2 which are both formed by pouring concrete, wherein the prefabricated primary beam 1 is provided with a notch 11 which is a groove structure with communicated bottoms, a non-broken primary bar is arranged in the prefabricated primary beam 1 below the notch 11, the primary bar is connected with parts at two sides of the notch 11, supporting side surfaces are arranged at two sides of the notch 11, the prefabricated secondary beam 2 comprises a first prefabricated secondary beam 21 and a second prefabricated secondary beam 22 which are connected through a plurality of reinforcing bars 23, namely, the middle parts of the first prefabricated secondary beam 21 and the second prefabricated secondary beam 22 are not connected through concrete and are only connected through the reinforcing bars 23, two ends of the reinforcing bars 23 are inserted into the first prefabricated secondary beam 21 and the second prefabricated secondary beam 22, the reinforcing bars 23 at the lower layer of the prefabricated secondary beam 2 are supported at the bottom of the notch 11 and are supported through the reinforcing bars 23 which are contacted with the bottom, therefore, the prefabricated main beam 1 and the prefabricated secondary beam 2 are vertically overlapped in a cross shape, the first prefabricated secondary beam 21, the second prefabricated secondary beam 22 and the notch 11 are enclosed to form a concrete pouring cavity 3, and after concrete is poured in the concrete pouring cavity 3, the prefabricated main beam 1 and the prefabricated secondary beam 2 can be fixedly connected into a whole.
In this embodiment, the distances between the notch 11 and the two side surfaces of the prefabricated secondary beam 2 are both greater than 10mm, so that the difficulty in hoisting can be reduced, and the collision of prefabricated parts is avoided.
In the embodiment, the two side surfaces of the prefabricated main beam 1 outside the gap 11 and the opposite side surfaces of the first prefabricated secondary beam 21 and the second prefabricated secondary beam 22 are embedded with the threaded sleeves 12, wherein the model of the threaded sleeve is M16, the threaded sleeve 12 is connected by section steel 5, concretely, the section steel 5 is C-shaped section steel, namely, two sides of the C-shaped steel are connected on the threaded sleeve 12 through bolts, so that the prefabricated girder 1 is supported on two side surfaces of the gap 11 through supporting surfaces which support two sides of the C-shaped steel arranged on the prefabricated girder 1, the rigidity of the prefabricated main beam 1 and the prefabricated secondary beam 2 is enhanced by supporting the opposite surfaces of the first prefabricated secondary beam 21 and the second prefabricated secondary beam 22 through the C-shaped steel installed on the prefabricated secondary beam 2, and the prefabricated main beam 1 is prevented from being bent at the notch 11 and between the first prefabricated secondary beam 21 and the second prefabricated secondary beam 22 in the hoisting process.
In the present embodiment, the shear grooves 24 are provided on the opposite surfaces of the first and second prefabricated sub-beams 21 and 22, so as to improve the shear strength after the prefabricated main beam 1 and the prefabricated sub-beam 2 are connected.
In the present embodiment, since the lower layer of the reinforcing bars 23 between the first prefabricated sub-beam 21 and the second prefabricated sub-beam 22 needs to bear a large positive pressure, and the upper layer of the reinforcing bars 23 mainly bears a tensile stress, the diameter of the lower layer of the reinforcing bars 23 between the first prefabricated sub-beam 21 and the second prefabricated sub-beam 22 is larger than that of the upper layer of the reinforcing bars 23, so as to prevent the lower layer of the reinforcing bars 23 from being deformed.
Then, the invention discloses a primary and secondary beam cross lap joint method, which comprises the primary and secondary beam cross lap joint structure of the scheme, and comprises the following steps:
s1, installing a jack 4 in the prefabricated main beam 1, wherein two ends of the jack 4 are supported at two sides of the notch 11, so that stress concentration at the bottom of the notch 11 caused by bending moment force during hoisting is avoided and the notch is prevented from cracking;
s2, after the prefabricated main beam 1 is hoisted to a preset position, the jack 4 is removed;
s3, similarly, installing a jack 4 on the opposite surface of the first prefabricated secondary beam 21 and the second prefabricated secondary beam 22 to avoid bending deformation of the reinforcing steel bars 23;
s4, hoisting the prefabricated secondary beam 2, supporting the steel bars 23 at the joint of the first prefabricated secondary beam 21 and the second prefabricated secondary beam 22 at the bottom of the notch 11, and further stably placing the prefabricated secondary beam 2;
s5, removing the jack 4 between the first prefabricated secondary beam 21 and the second prefabricated secondary beam 22;
s6, performing formwork supporting treatment outside the concrete pouring cavity 3 to prevent the concrete pouring cavity 3 from overflowing during pouring;
and S7, pouring concrete into the concrete pouring cavity 3, and after the preset strength is achieved, removing the formwork, so that the prefabricated main beam 1 and the prefabricated secondary beam 2 are connected.
In the embodiment, before the jacks 4 are installed, the C-shaped steel installed on the prefabricated main beam 1 and the prefabricated secondary beam 2 is removed.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a primary and secondary beam cross overlap joint structure, includes concrete placement fashioned prefabricated girder and prefabricated secondary beam, its characterized in that, be provided with the breach on the prefabricated girder, prefabricated secondary beam includes first prefabricated secondary beam and the prefabricated secondary beam of second through many steel bar connections, prefabricated secondary beam lower floor the reinforcing bar supports the bottom of breach, first prefabricated secondary beam, the prefabricated secondary beam of second and the breach encloses and establishes into a concrete placement chamber.
2. The primary and secondary beam cross lap joint structure of claim 1, wherein the distance between said gap and both side surfaces of said precast secondary beam is greater than 10 mm.
3. The primary and secondary beam cross lap joint structure of claim 1, wherein threaded sleeves are embedded in both side surfaces of the prefabricated main beam located in the gap and opposite side surfaces of the first prefabricated secondary beam and the second prefabricated secondary beam, and the threaded sleeves are connected and supported by section steel.
4. The primary and secondary girder cross lap joint structure as claimed in claim 1, wherein the first and second prefabricated secondary girders are provided with shear grooves on opposite faces thereof.
5. The primary and secondary girder cross lap joint structure of claim 1, wherein the diameter of the reinforcing bars of the lower layer between the first and second prefabricated secondary girders is larger than the diameter of the reinforcing bars of the upper layer.
6. A primary and secondary beam cross lap joint method including the primary and secondary beam cross lap joint structure according to any one of claims 1 to 5, comprising the steps of:
s1, installing jacks in the prefabricated main beams, wherein two ends of each jack are supported on two sides of the notch;
s2, after the prefabricated main beam is hoisted to a preset position, the jack is removed;
s3, mounting the jack on the opposite surfaces of the first prefabricated secondary beam and the second prefabricated secondary beam;
s4, hoisting the prefabricated secondary beam, and supporting the steel bar at the joint of the first prefabricated secondary beam and the second prefabricated secondary beam at the bottom of the notch;
s5, removing a jack between the first prefabricated secondary beam and the second prefabricated secondary beam;
s6, formwork supporting treatment is carried out outside the concrete pouring cavity;
and S7, pouring concrete into the concrete pouring cavity, and removing the formwork after the concrete reaches the preset strength.
7. The method of claim 6, wherein the sectional steel installed on the prefabricated main beams and the prefabricated secondary beams is removed before the jacks are installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011359283.0A CN112411746A (en) | 2020-11-27 | 2020-11-27 | Primary and secondary beam cross lap joint structure and connection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011359283.0A CN112411746A (en) | 2020-11-27 | 2020-11-27 | Primary and secondary beam cross lap joint structure and connection method thereof |
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| CN112411746A true CN112411746A (en) | 2021-02-26 |
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| CN202011359283.0A Pending CN112411746A (en) | 2020-11-27 | 2020-11-27 | Primary and secondary beam cross lap joint structure and connection method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100855547B1 (en) * | 2007-05-25 | 2008-09-01 | 동서 피, 씨, 씨 주식회사 | Structure for jointing framework of clean room construction |
| CN105040829A (en) * | 2015-06-26 | 2015-11-11 | 南京长江都市建筑设计股份有限公司 | Prefabricated concrete main beam and secondary beam connecting structure and construction method thereof |
| CN110130487A (en) * | 2019-05-24 | 2019-08-16 | 广东中建新型建筑构件有限公司 | A kind of prefabricated primary and secondary beam connecting node and connection method |
| CN110439180A (en) * | 2019-08-20 | 2019-11-12 | 长沙远大住宅工业安徽有限公司 | A kind of cross coupling and construction method |
| CN210164046U (en) * | 2019-05-08 | 2020-03-20 | 江西建邦建设集团有限公司 | Prefabricated girder of assembled and secondary beam connected node structure |
| CN111719849A (en) * | 2020-08-11 | 2020-09-29 | 中交三航局第三工程有限公司 | Primary and secondary beam one-step forming structure of PC superposed beam and construction method thereof |
-
2020
- 2020-11-27 CN CN202011359283.0A patent/CN112411746A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100855547B1 (en) * | 2007-05-25 | 2008-09-01 | 동서 피, 씨, 씨 주식회사 | Structure for jointing framework of clean room construction |
| CN105040829A (en) * | 2015-06-26 | 2015-11-11 | 南京长江都市建筑设计股份有限公司 | Prefabricated concrete main beam and secondary beam connecting structure and construction method thereof |
| CN210164046U (en) * | 2019-05-08 | 2020-03-20 | 江西建邦建设集团有限公司 | Prefabricated girder of assembled and secondary beam connected node structure |
| CN110130487A (en) * | 2019-05-24 | 2019-08-16 | 广东中建新型建筑构件有限公司 | A kind of prefabricated primary and secondary beam connecting node and connection method |
| CN110439180A (en) * | 2019-08-20 | 2019-11-12 | 长沙远大住宅工业安徽有限公司 | A kind of cross coupling and construction method |
| CN111719849A (en) * | 2020-08-11 | 2020-09-29 | 中交三航局第三工程有限公司 | Primary and secondary beam one-step forming structure of PC superposed beam and construction method thereof |
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Application publication date: 20210226 |
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