CN112554561B - Beam upturning node structure with good crack resistance and construction method thereof - Google Patents

Beam upturning node structure with good crack resistance and construction method thereof Download PDF

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Publication number
CN112554561B
CN112554561B CN202011370973.6A CN202011370973A CN112554561B CN 112554561 B CN112554561 B CN 112554561B CN 202011370973 A CN202011370973 A CN 202011370973A CN 112554561 B CN112554561 B CN 112554561B
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normal
upturning
plate
upturned
stirrups
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CN112554561A (en
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毛范燊
曹炜
成戎
刘�东
王妍
郁欣捷
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Architecture Design and Research Institute of Tongji University Group Co Ltd
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Architecture Design and Research Institute of Tongji University Group Co Ltd
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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
    • 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
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • 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
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
    • 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
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The invention discloses a beam upturning joint structure with good crack resistance and a construction method thereof, wherein the beam upturning joint structure comprises a normal plate, a normal beam for supporting the normal plate, a lifting plate higher than the normal plate elevation, an upturning beam for supporting the lifting plate, a beam bottom parallel to the normal beam bottom, and a beam top elevation higher than the normal beam top elevation, and a beam support for connecting the upturning beam with the normal beam, wherein a plurality of channel steels are sequentially arranged in the upturning beam along the extending direction of the upturning beam, the upper flange and the lower flange of each channel steel respectively face the beam bottom and the beam top of the upturning beam, meanwhile, split bolts are oppositely arranged between the upper flange and the lower flange, the limb tips face one side of the lifting plate, and holes for steel bars in the normal plate to pass through are arranged on a web plate. The steel channel is arranged, so that the crack can be limited to develop, and the stirrup can be helped to resist the torque caused by the bending moment of the plate end to a certain extent; the hole of channel-section steel can strengthen the connection performance of board and roof beam concrete, and the board reinforcing bar can avoid being interrupted through this hole.

Description

Beam upturning node structure with good crack resistance and construction method thereof
Technical Field
The invention relates to an upturning node structure, in particular to a beam upturning node structure with good crack resistance and a construction method thereof.
Background
In the design of a floor slab structure, due to requirements of construction or equipment specialties and the like, the situation of 'slab lifting' is often met, namely, the structural elevation of a certain floor slab needs to be raised and is higher than the slab elevation of a normal floor, and at the moment, the beam elevation connected with the floor slab needs to be correspondingly raised. If the beam passes through the plate with the standard height of the normal plate surface and the plate behind the lifting plate, the method of selecting the beam top elevation at the normal plate surface and selecting the beam upturning node at the lifting plate position is generally selected; sometimes, the method of folding the beam is also selected, but the beam folding method has the defects of difficult construction and poorer stress performance than the upturning method.
In the structural design, the concrete and the steel bars which are excessive at the upturned section are generally regarded as line loads and considered during the calculation of the reinforcing bars, and the influence of the upturned section on the beam resistance is not considered. In an actual stress state, the upturned section has certain influence on the bearing capacity of the beam, particularly on the bending rigidity; this results in a situation where the actual force situation of the component is not consistent with the computational model.
If the upturned joint is regarded as a part of the stress member, the upturned joint participates in stress in design, and then the variable cross-section beam is formed. If the height of the riser is higher, the height of the beam at the variable cross section is greatly different, and the situation of great rigidity difference is caused. This is detrimental to the load bearing properties of the beam.
The longitudinal bars of the beam upturning nodes have no special anchoring requirements at the support, and particularly, when the upturning nodes are high in height, the nodes at the beam ends are obviously cracked under the action of negative bending moment, and even if the cracks do not affect the safety of the structure in a short period, the reinforcing bars in the upturning nodes are rusted after being exposed in the air for a long time.
One side of a high-elevation floor slab is lapped on an upturning node of a beam, if the other side of the upturning node has no corresponding lifting plate balance bending moment, the upturning node can be subjected to out-of-plane torque transmitted by the floor slab, and the torque needs to be borne by stirrups connecting the upturning node and the beam. The place where the lifting plate is needed is often located in an equipment room or the like (especially an elevator room), the equipment room is generally used for storing equipment or a water tank, the load is very large, and the torque which needs to be borne by the stirrups is also very large. When the stirrup is not sufficiently reinforced or the anchoring length is not sufficient, a crack along the beam axis direction can occur between the upturning node and the beam.
Therefore, it is desired to solve the above problems.
Disclosure of Invention
The purpose of the invention is as follows: a first object of the present invention is to provide a beam upturning node structure having good crack resistance, which can limit crack development and help to resist a torque caused by a plate end bending moment to some extent, and a construction method thereof.
The second purpose of the invention is to provide a construction method of the beam upturning node structure with good crack resistance.
The technical scheme is as follows: in order to achieve the purpose, the invention discloses a beam upturning node structure with good crack resistance, which comprises a normal plate, a normal beam for supporting the normal plate, a lifting plate higher than the elevation of the normal plate, an upturning beam for supporting the lifting plate, an upturning beam with the beam bottom parallel to the beam bottom of the normal beam and the elevation of the beam top higher than the elevation of the beam top of the normal beam, and a beam support for connecting the upturning beam and the normal beam, wherein a plurality of channel steels are sequentially arranged in the upturning beam along the extending direction of the upturning beam, the upper flange and the lower flange of each channel steel respectively face the beam bottom and the beam top of the upturning beam, split bolts are oppositely arranged between the upper flange and the lower flange, the tips of the channel steels face one side of the lifting plate, and holes for steel bars in the normal plate to pass through are formed in a web plate.
And the steel bars in the constant plate penetrate through the holes of the channel steel webs and extend beyond the center line of the beam.
Preferably, the upturning beam is internally provided with longitudinal bars and stirrups for binding the longitudinal bars, and the heights of the stirrups are matched with the elevation of the normal beam.
Furthermore, the channel-section steel and the stirrup of staggering along turning over the roof beam extending direction on in the roof beam that turns over have reserved stirrup, reserve stirrup and stirrup interval arrangement, the height of reserving the stirrup and turn over roof beam elevation looks adaptation on.
Furthermore, a bending reinforcing steel bar is arranged in the upturned beam, one end of a horizontal section of the bending reinforcing steel bar is inserted into the beam support, the other end of the horizontal section is bent downwards after horizontally extending a section along the upturned beam, and the bent bending reinforcing steel bar extends to the junction of the upturned beam and the normal beam.
Preferably, the bent steel bars are bound and fixed with the adjacent reserved stirrups.
Moreover, the length of the horizontal section of the bent reinforcing steel bar is more than or equal to 1/3 liter of plate length.
Furthermore, a polytetrafluoroethylene sliding layer is arranged in the upward turning beam, is intersected with the normal beam and is arranged at the junction of the upward turning beam and the normal beam.
Preferably, the length of the upturned beam minus the length of the polytetrafluoroethylene slippage layer is no more than one third of the span of the upturned beam.
The invention relates to a construction method of a beam upturning node structure with good crack resistance, which comprises the following steps:
(1) holes are formed in the upper flange, the lower flange and the web plate of the channel steel, and the holes in the web plate are aligned with the plate thickness of the ordinary plate, so that the steel bars of the ordinary plate can penetrate through the holes after the channel steel is fixed;
(2) a bottom die for installing a common plate, templates on two side surfaces of the beam and a template at the bottom of the beam;
(3) penetrating a split bolt through holes of upper and lower flanges of the channel steel and fixing the split bolt by a nut; placing the channel steel with the oppositely pulling bolts on one side of a normal plate to be turned upwards, and fixing the channel steel with building glue;
(4) binding stirrups and longitudinal reinforcements in the upturned beam, wherein the height of the stirrups is matched with the elevation of the normal beam, and the steel bars in the normal plate penetrate through the holes of the web plates of the channel steel and extend beyond the central line of the beam; binding a reserved stirrup in the upturned beam, wherein the height of the reserved stirrup is matched with that of the upturned beam, and the reserved stirrup and the stirrup are arranged at intervals and reserved;
(5) pouring concrete of the normal beam, the lower part of the upturned beam with the same height as the normal beam and the normal plate; maintaining to the standard or designing the specified strength, then removing the mold, and pouring concrete at the lower part of the upturned beam with the same height as the normal beam at the lower part of the reserved stirrup;
(6) arranging a polytetrafluoroethylene sliding layer on the poured beam, and connecting the bottom of the sliding layer with the poured concrete by using building glue; the total length of the upturned beam minus the length of the polytetrafluoroethylene sliding layer is not more than one third of the span of the beam;
(7) arranging an upturning beam side formwork and a lifting plate bottom formwork;
(8) binding bent reinforcing steel bars on site, inserting one end of a horizontal section of each bent reinforcing steel bar into the beam support, horizontally extending a section of the other end of the horizontal section along the upturned beam, and then bending the other end of the horizontal section downwards, wherein the bent reinforcing steel bars extend to the junction of the upturned beam and the normal beam; wherein the bent steel bar is fixed on the top of the reserved stirrup at the horizontal section by a binding wire; when the bent reinforcing steel bar is bent downwards, the bent reinforcing steel bar is fixed on the reserved stirrups at the two sides of the bent reinforcing steel bar by binding wires;
(9) and pouring concrete, and removing the formwork after the strength grade of the concrete reaches the specified strength.
Has the beneficial effects that: compared with the prior art, the invention has the following remarkable advantages:
(1) the steel channel is arranged, so that the crack can be limited, and the stirrup can be helped to resist the torque caused by the bending moment of the plate end to a certain extent; wherein the split limiting effect can be further enhanced by the counter-pulling screw rod; the beam upturning node can be ensured to have enough bearing capacity to resist the torque caused by the lifting plate and is not cracked; meanwhile, the hole in the web plate of the channel steel is arranged at the plate thickness of the normal elevation plate surface; due to the existence of the channel steel web plate, a part of concrete and plate steel bars can be broken, the connection performance of the plate and beam concrete can be enhanced through the hole, the plate steel bars can pass through the hole, the breaking is avoided, and the overall strength is enhanced;
(2) in the invention, the crack-limiting bent steel bar in the upturning beam is anchored and inserted into the beam support, so that the upturning section has certain negative bending moment resistance, the crack caused by the negative bending moment can be limited to a certain extent, and the crack of an upturning node at the beam support can be further limited;
(3) the invention adopts the polytetrafluoroethylene sliding layer, so that the section inertia moment I of the upturned section is equal to 2 times of the section inertia moment I of the non-upturned section of the beam, the difference of the bending rigidity of the component at the variable section is greatly relieved, the actual stress state of the beam can be better matched with the calculation state during design, and the problem that the rigidity difference at the variable section of the beam is too large is avoided.
Drawings
FIG. 1 is a schematic structural view of a channel steel according to the present invention;
FIG. 2(a) is a side view of a first installation of the form of the present invention;
FIG. 2(b) is a top view of a first installation form of the present invention;
FIG. 2(c) is an end view of the first secondary deck of the present invention with the form panels installed;
FIG. 2(d) is an end view of the present invention with the form panel installed at the first lift;
FIG. 3(a) is a side view of the mounting channel of the present invention;
FIG. 3(b) is a top view of the mounting channel of the present invention;
FIG. 3(c) is an end view of the present invention without channel steel installed at the gimbal;
FIG. 3(d) is an end view of the mounting channel of the riser of the present invention;
FIG. 4(a) is an end view of the present invention with the stirrup and longitudinal bar installed;
FIG. 4(b) is an end view of the invention with pre-formed stirrups installed at the riser;
FIG. 4(c) is a schematic structural view of the stirrup in the present invention;
FIG. 4(d) is a schematic structural view of the pre-formed stirrup of the present invention;
FIG. 5(a) is a side view of the present invention with a first step of placing concrete;
FIG. 5(b) is a top view of the first concrete step of the present invention;
FIG. 5(c) is an end view of the present invention showing a first step of placing concrete at the decking;
FIG. 5(d) is an end view of the present invention with the first concrete step placed at the riser;
FIG. 6(a) is a side view of the present invention with a glide layer;
FIG. 6(b) is a top view of the present invention with a glide layer;
FIG. 7(a) is a side view of a second installation form of the present invention;
FIG. 7(b) is a top view of a second installation form of the present invention;
FIG. 7(c) is an end view of the form of the present invention mounted at the second riser;
FIG. 8(a) is a side view of the present invention with bent reinforcing bars;
FIG. 8(b) is an end view of the present invention showing the bending section of the bent reinforcing bar;
FIG. 8(c) is an end view of the present invention with horizontal sections of bent steel reinforcement provided;
FIG. 8(d) is a top view of the present invention with bent bars;
FIG. 9 is a side view of a flip-up node structure of the present invention;
fig. 10 is a top view of a flip-up node structure of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in figure 1, the beam upturning node structure with good crack resistance comprises a constant plate 1, a constant beam 2, a lifting plate 3, an upturning beam 4 and a beam support 5. The normal board 1 is the floor of normal elevation, and normal roof beam 2 is for supporting normal board 1 with being used for of normal board 1 looks adaptation, rises the floor of board 3 for in normal board elevation, and the roof beam 4 that turns up is used for supporting and rises board 3, and the beam bottom of the roof beam 4 that turns up is higher than normal roof beam top elevation with the roof beam bottom looks parallel and level of turning up 4. The beam support 5 is connected with the upturning beam and the normal beam.
The channel-section steel 6 that has a plurality of is arranged in proper order along the roof beam extending direction that turns up in the roof beam 4 that turns up, and the upper and lower edge of a wing of this channel-section steel is equipped with split bolt 7 towards the beam bottom and the roof beam top of turning up the roof beam respectively, and the opposite penetration between the upper and lower edge of a wing simultaneously, channel-section steel limb point towards rise board one side, have the hole 9 that can supply normal inboard reinforcing bar 8 to pass on the web, and normal inboard reinforcing bar 8 passes the hole 9 of channel-section steel web and extends beyond the roof beam central line, and the hole can be circular or regular polygon. Meanwhile, the hole in the web plate of the channel steel is arranged at the plate thickness of the normal elevation plate surface; because of the existence of channel-section steel web, some concrete and board reinforcing bar will be broken, and this hole can strengthen the connection performance of board and roof beam concrete, and the board reinforcing bar can avoid being broken through this hole, reinforcing bulk strength. The upturning beam 4 is internally provided with longitudinal bars 10 and stirrups 11 for binding the longitudinal bars, and the heights of the stirrups 11 are matched with the elevation of the normal beam 1. The upturning beam bears the plate end bending moment of the lifting plate, and the upturning area is generally connected with the beam through the stirrups, so that the stirrups at one side far away from the lifting plate bear the action of tension; the lifting plate is generally used for an equipment room, and the bending moment is large at the position, so that the bending moment borne by the stirrup is also large; when the anchoring length of the stirrups is limited by the height of the beam and is insufficient or the stirrups are less in configuration, cracks between the upturning area and the beam are easily caused; the steel channel is arranged, so that the crack can be limited to develop, and the stirrup can be helped to resist the torque caused by the bending moment of the plate end to a certain extent; wherein the split limiting effect can be further enhanced by the counter-pulling screw rod; the beam upturning node can be ensured to have enough bearing capacity to resist the torque caused by the lifting plate and is not cracked.
Reserved stirrups 12 are sequentially arranged in the upturned beam 4 along the extending direction of the upturned beam in a staggered mode in the channel steel and the stirrups, the reserved stirrups 12 and the stirrups 11 are arranged at intervals, and the height of the reserved stirrups 12 is matched with the elevation of the upturned beam 4; a bent steel bar 13 is arranged in the upturned beam 4, one end of a horizontal section of the bent steel bar 13 is inserted into the beam support, the other end of the horizontal section is bent downwards after horizontally extending a section along the upturned beam, and the bent steel bar extends to the junction of the upturned beam and the normal beam; the length of the horizontal section of the bent steel bar 13 is more than or equal to 1/3L; the bent steel bars 13 are bound and fixed with the adjacent reserved stirrups 12, wherein the bent steel bars are fixed at the tops of the reserved stirrups by binding wires at the horizontal sections; when the bent reinforcing steel bar is bent downwards, the bent reinforcing steel bar is fixed on the reserved stirrups at the two sides of the bent reinforcing steel bar by using the binding wires. The longitudinal ribs of the upturning nodes have no special anchoring requirements at the beam support, so that the beam member has no negative bending moment resistance at the upturning section; particularly, when the upturned joint is high in height, the joint of the beam end is cracked obviously under the action of negative bending moment, and even if the crack does not affect the safety of the structure in a short period, the steel bars in the upturned joint are rusted after being exposed in the air for a long time. In the invention, the crack-limiting bent steel bar in the upturning beam is anchored and inserted into the beam support, so that the upturning section has certain negative bending moment resistance, the crack caused by the negative bending moment can be limited to a certain extent, and the crack of the upturning node at the beam support can be further limited.
The upturned beam 4 is internally intersected with the normal beam and is provided with a polytetrafluoroethylene sliding layer 14 at the junction with the normal beam, and the length of the upturned beam 4 minus the length of the polytetrafluoroethylene sliding layer is not more than one third of the span of the upturned beam. When the elastic modulus E is constant, the bending rigidity of the beam is proportional to the section inertia moment I of the beam section, for a rectangular section, I is bh3/12, the net height of the upturned beam is assumed to be equal to the height of the beam, that is, the section inertia moment I of the upturned section is equal to 8 times of the section inertia moment I of the non-upturned section of the beam, and the rigidity difference is huge. When the polytetrafluoroethylene sliding layer is adopted, the section inertia moment I of the upturned section is equal to 2 times of the section inertia moment I of the non-upturned section of the beam, so that the difference of the bending rigidity of the components at the variable section is greatly relieved, the actual stress state of the beam can be better matched with the calculation state during design, and the problem that the rigidity difference at the variable section of the beam is too large is avoided.
The invention relates to a construction method of a beam upturning node structure with good crack resistance, which comprises the following steps:
(1) holes are formed in the upper flange, the lower flange and the web plate of the channel steel, and the holes in the web plate are aligned with the plate thickness of the ordinary plate, so that the steel bars of the ordinary plate can penetrate through the holes after the channel steel is fixed; the distance between the center point of the web hole and the upper and lower flanges is controlled, so that the steel bar of the ordinary plate can smoothly pass through the fixed channel steel, as shown in fig. 1;
(2) a bottom die 15 for mounting a normal plate, two side beam face templates 16 and a bottom beam template 17, as shown in fig. 2(a) to 2 (d);
(3) penetrating a split bolt through holes of upper and lower flanges of the channel steel and fixing the split bolt by a nut; placing the channel steel with the oppositely pulling bolts on one side of the normal plate to be turned upwards, and fixing the channel steel with building glue, as shown in figures 3(a) -3 (d);
(4) binding stirrups and longitudinal reinforcements in the upturned beam, wherein the height of the stirrups is matched with the elevation of the normal beam, and the steel bars in the normal plate penetrate through the holes of the web plates of the channel steel and extend beyond the central line of the beam; binding a reserved stirrup in the upturned beam, wherein the height of the reserved stirrup is matched with that of the upturned beam, and the reserved stirrup and the stirrup are arranged at intervals as shown in figures 4(a) -4 (d);
(5) pouring concrete of the normal beam, the lower part of the upturned beam and the normal slab which have the same height with the normal beam; after the concrete is maintained to the strength specified by the specification or design, the formwork is removed, the lower part of the reserved stirrup is poured into the concrete at the lower part of the upturned beam with the same height as the normal beam, and the concrete is shown in figures 5(a) to 5 (d);
(6) arranging a polytetrafluoroethylene sliding layer on the poured beam, and connecting the bottom of the sliding layer with the poured concrete by using building glue; the total length of the upturned beam minus the length of the polytetrafluoroethylene sliding layer is no more than one third of the span of the beam, as shown in fig. 6(a) -6 (b);
(7) providing an upturned beam side formwork 18, an upturned beam end formwork 19 and a riser bottom formwork 20, as shown in fig. 7(a) -7 (c);
(8) binding bent reinforcing steel bars on site, inserting one end of a horizontal section of each bent reinforcing steel bar into the beam support, horizontally extending a section of the other end of the horizontal section along the upturned beam, and then bending the other end of the horizontal section downwards, wherein the bent reinforcing steel bars extend to the junction of the upturned beam and the normal beam; wherein the bent steel bar is fixed on the top of the reserved stirrup at the horizontal section by a binding wire; when the bent steel bar is bent downwards, the bent steel bar is fixed on the reserved stirrups at the two sides of the bent steel bar by binding wires, as shown in fig. 8(a) -8 (d);
(9) and pouring concrete, and removing the formwork after the strength grade of the concrete reaches the specified strength, as shown in fig. 9 and 10.

Claims (9)

1. The utility model provides a turn over node structure on roof beam with good crack resistance ability which characterized in that: the steel-bar-type lifting device comprises a normal plate (1), a normal beam (2) for supporting the normal plate, a lifting plate (3) higher than the elevation of the normal plate, a beam support (5) for supporting the lifting plate, a plurality of channel steel (6) and upper and lower flanges, wherein the bottom of the lifting plate is parallel to the bottom of the normal beam, the elevation of the top of the beam is higher than the elevation of the top of the normal beam, the beam support (5) is used for connecting the lifting beam with the normal beam, the upper and lower flanges of the channel steel are respectively towards the bottom and the top of the lifting beam, a split bolt (7) is oppositely arranged between the upper and lower flanges, the limb tip of the channel steel faces one side of the lifting plate, and a hole (9) for a steel bar (8) in the normal plate to pass through is formed in a web plate; and a polytetrafluoroethylene sliding layer (14) is arranged in the upturning beam (4) and is intersected with the normal beam, and the junction of the upturning beam and the normal beam.
2. The beam upturning node structure having good crack resistance of claim 1, wherein: and reinforcing steel bars (8) in the constant plates penetrate through holes (9) of the channel steel webs and extend beyond the center line of the beam.
3. The beam upturning node structure having good crack resistance of claim 1, wherein: the upward-turning beam (4) is internally provided with longitudinal bars (10) and stirrups (11) for binding the longitudinal bars, and the heights of the stirrups (11) are matched with the elevation of the normal beam (2).
4. The beam upturning node structure with good crack resistance of claim 3, wherein: the upper turning beam (4) is internally provided with reserved stirrups (12) which are arranged in sequence along the staggered channel steel and stirrups of the upper turning beam in the extending direction, the reserved stirrups (12) and the stirrups (11) are arranged at intervals, and the height of the reserved stirrups (12) is matched with the elevation of the upper turning beam (4).
5. The beam upturning node structure with good crack resistance of claim 4, wherein: and a bent reinforcing steel bar (13) is arranged in the upturned beam (4), one end of a horizontal section of the bent reinforcing steel bar (13) is inserted into the beam support, the other end of the horizontal section is bent downwards after horizontally extending a section along the upturned beam, and the bent reinforcing steel bar extends to the junction of the upturned beam and the normal beam.
6. The beam upturning node structure having good crack resistance of claim 5, wherein: and the bent reinforcing steel bars (13) are bound and fixed with the adjacent reserved stirrups (12).
7. The beam upturning node structure having good crack resistance of claim 5, wherein: the length of the horizontal section of the bent steel bar (13) is more than or equal to 1/3 liters of plate length.
8. The beam upturning node structure having good crack resistance of claim 1, wherein: the length of the upturned beam (4) minus the length of the polytetrafluoroethylene sliding layer is not more than one third of the span of the upturned beam.
9. The construction method of the beam upturning node structure with good crack resistance as claimed in any one of claims 1-8, comprising the steps of:
(1) holes are formed in the upper flange, the lower flange and the web plate of the channel steel, and the holes in the web plate are aligned with the plate thickness of the ordinary plate, so that the steel bars of the ordinary plate can penetrate through the holes after the channel steel is fixed;
(2) a bottom die for installing a common plate, templates on two side surfaces of the beam and a template at the bottom of the beam;
(3) penetrating a split bolt through holes of upper and lower flanges of the channel steel and fixing the split bolt by a nut; placing the channel steel with the oppositely pulling bolts on one side of a normal plate to be turned upwards, and fixing the channel steel with building glue;
(4) binding stirrups and longitudinal reinforcements in the upturned beam, wherein the height of the stirrups is matched with the elevation of the normal beam, and the steel bars in the normal plate penetrate through the holes of the web plates of the channel steel and extend beyond the central line of the beam; binding a reserved stirrup in the upturned beam, wherein the height of the reserved stirrup is matched with that of the upturned beam, and the reserved stirrup and the stirrup are arranged at intervals and reserved;
(5) pouring concrete of the normal beam, the lower part of the upturned beam with the same height as the normal beam and the normal plate; maintaining to the standard or designing the specified strength, then removing the mold, and pouring concrete at the lower part of the upturned beam with the same height as the normal beam at the lower part of the reserved stirrup;
(6) arranging a polytetrafluoroethylene sliding layer on the poured beam, and connecting the bottom of the sliding layer with the poured concrete by using building glue; the total length of the upturned beam minus the length of the polytetrafluoroethylene sliding layer is not more than one third of the span of the beam;
(7) arranging an upturning beam side formwork and a lifting plate bottom formwork;
(8) binding bent reinforcing steel bars on site, inserting one end of a horizontal section of each bent reinforcing steel bar into the beam support, horizontally extending a section of the other end of the horizontal section along the upturned beam, and then bending the other end of the horizontal section downwards, wherein the bent reinforcing steel bars extend to the junction of the upturned beam and the normal beam; wherein the bent steel bar is fixed on the top of the reserved stirrup at the horizontal section by a binding wire; when the bent reinforcing steel bar is bent downwards, the bent reinforcing steel bar is fixed on the reserved stirrups at the two sides of the bent reinforcing steel bar by binding wires;
(9) and pouring concrete, and removing the formwork after the strength grade of the concrete reaches the specified strength.
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