CN201826439U - Assembled self-compaction steel tube concrete combined structure - Google Patents

Assembled self-compaction steel tube concrete combined structure Download PDF

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Publication number
CN201826439U
CN201826439U CN2010205749894U CN201020574989U CN201826439U CN 201826439 U CN201826439 U CN 201826439U CN 2010205749894 U CN2010205749894 U CN 2010205749894U CN 201020574989 U CN201020574989 U CN 201020574989U CN 201826439 U CN201826439 U CN 201826439U
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China
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steel
concrete
steel tube
assembling
combined structure
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Expired - Lifetime
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CN2010205749894U
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Chinese (zh)
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何振军
韩林海
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Tsinghua University
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Tsinghua University
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Abstract

The utility model belongs to the field of structural engineering, and relates to an assembled self-compaction steel tube concrete combined structure which is a rectangular structure that is formed by the enclosing of assembled steel plates, and the interior of the assembled self-compaction steel tube concrete combined structure is filled with core concrete; the assembled steel plates are mutually nested at the corners or the middle parts of the combined structure through sliders, and can slide; and a plurality of prestressing tendons are arranged on the different sections of the interior, the outer part or the four corners of the combined structure. Under the action of the prestress, the assembled steel plates can do contraction movement towards the interior, the problems that due to contraction and pouring, the core concrete and the steel tube walls are not dense and the interior is not dense can be solved, so that the assembled self-compaction steel tube concrete combined structure can be always in the three-direction pressure prestress state, the redistribution of inner force on the sections can be prevented, puncturing prestressing tendon can constrict a pull rod, the stability of the tube wall can be improved, the bending can be avoided, so that the combined structure can achieve higher loading capacity, stiffness and ductility and other mechanical indicators. The assembled self-compaction steel tube concrete combined structure can be applied to high-rise buildings, large-span high viaduct bridges and other important structures.

Description

A kind of assembling self-compaction steel tube-concrete composite structure
Technical field
The utility model belongs to technical field of structural engineering, particularly a kind of assembling self-compaction steel tube-concrete composite structure.
Background technology
Concrete filled steel tube is as a kind of combined member, utilize two kinds of material interactions in loading process of steel pipe and concrete, can give full play to the big and good advantage of concrete compression performance of steel tensile strength, remedied two kinds of materials shortcoming separately simultaneously, this is the advantage place of steel tube-concrete composite structure.Its basic principle is specially: 1. utilize the supporting role of concrete filled, strengthen the geometrical stability of steel pipe walls, change the unstable failure pattern of empty steel pipe, avoiding or to delay steel pipe generation cripling, thereby guarantee giving full play to of tube material performance.2. utilize the effect of contraction of steel pipe to core concrete, make core concrete be in the three-dimensional compressive stress state, the rigidity that the pipe inner concrete forms is restrained effect, thereby improve concrete compressive strength and deformability, its plasticity and toughness are greatly improved, and have prevented the brittle fracture of steel pipe inner concrete.In addition, in the work progress of concrete filled steel tube, steel pipe can also be as building the template of core concrete, so easy construction and can reduce operating expenses.As the above, steel pipe and the cooperative compensating effect between core concrete thereof of forming concrete filled steel tube are the basic reasons that concrete filled steel tube has a series of outstanding advantages, and therefore, can steel pipe and core concrete co-operation very important.This just needs to solve builds in the process between core concrete inside, core concrete and steel pipe walls etc. the space that produces, bubble etc. and builds defective; Simultaneously, also need to solve core concrete because the problems such as slit that produce between contraction and the steel pipe walls.
Summary of the invention
The purpose of this utility model provides a kind of new construction that can be applicable to, and is particularly suitable for, the post of special labyrinth important as high building project, large span elevated bridge engineering, metro station tunnel engineering etc. and the assembling self-compaction steel tube-concrete composite structure of supporting member.
The technical solution adopted in the utility model is: the rectangular configuration of described combining structure for being surrounded by the assembling steel plate, and the core concrete of portion's filling within it.The end of four blocks of assembling steel plates is respectively equipped with slide block, and described assembling steel plate is nested mutually nested by steel plate at the bight or the middle part of described combining structure by slide block, and can slide; Two adjacent described steel plates are nested to be connected by the nested fixedly rigidity of steel plate bloom; On the varying cross-section in inside, outside or four bights of described combining structure, many prestressed reinforcements are set, be called vertically-displacable, external formula and bight formula, the assembling steel plate can be done striction sport to inside under the compressive pre-stress effect, producing compressive pre-stress can make the gas in the described combining structure discharge, and can remedy follow-up core concrete surrounded surface owing to shrinking the slit that produces, make core concrete be in the three-dimensional compressive stress state all the time.
Described prestressed reinforcement highly is the position of 1000-2500mm around being arranged in described combining structure, adopt the symmetrical expression arrangement of layering, and the presstressed reinforcing steel anchored end is set on the outer wall of the end of every prestressed reinforcement, described combining structure, avoid local steel plate or concrete to destroy owing to stress of prestressed steel is concentrated, or the perk of steel plate end.
On four faces of the outer wall of described combining structure the center be symmetrical arranged the height spacing be that 800~1200mm, diameter are the steam vent of 12~15mm, tighten at described prestressed reinforcement under the effect of compressive stress, help combining structure gas inside discharging, simultaneously also as the steam exhaust-gas hole of fire preventing construction measure.
Described assembling steel plate is high-strength steel, ordinary steel or the stainless steel of yield strength more than 550MPa; Concrete is ordinary concrete or compressive strength high-strength concrete and the self-compacting concrete at 80~120MPa.
The compressive pre-stress that described prestressed reinforcement produces is 0.2~1.0MPa.
When described prestressed reinforcement is positioned at this combining structure outside, tackles it and do antirust processing.
The quantity of described prestressed reinforcement increases with the increase in described combining structure cross section.
The beneficial effects of the utility model are:
This structure not only technology is simple, simple for production, advantage with conventional encased structures, and owing to adopted the assembling steel plate and on steel pipe walls, adopted prestressing force, and the setting of auxiliary construction such as steam vent, under the compressive pre-stress effect of prestressed reinforcement, can overcome core concrete owing to shrinking, build between the steel pipe walls that causes and the core concrete and inner leakiness problem, make core concrete be in the three-dimensional compressive stress state to all the time in length and breadth, avoid cross section internal force and system redistribution of internal force; Simultaneously prestressed reinforcement plays high-strength, plastic binding bar effect again, improves the stability of tube wall, avoids Local Convex drum flexing, and because pre-tensile stress is arranged, its to the strength and stiffness that concrete filled steel tube provided will be higher, ductility is better; Thereby make the more conventional encased structures of this combining structure obtain higher bearing capacity, bigger bending resistance lateral rigidity, better ductility, more superior anti-seismic performance, transportation-construction more efficiently-advantages such as installation.Also can reduce the sectional dimension and the deadweight of member in addition significantly, give full play to the effect of material and save structural cost, not needing or lacking needs welding and template is set.Therefore, the utility model can be used for new construction, is particularly suitable for striding greatly viaduct pier, superelevation layer structure, subway tunnel etc., important, the special labyrinth that mechanical performance indexs such as bearing capacity, bending resistance lateral rigidity, anti-seismic performance are had relatively high expectations.
Description of drawings
Fig. 1 is the elevational schematic view of combining structure described in the utility model;
Fig. 2 (a) is for forming steel pipe four block plate ends that the bight is nested, through ribbed, steel pipe are the A-A face cross section concept map of square-section;
Fig. 2 (b) is for forming steel pipe four block plate ends that the middle part is nested, through ribbed, steel pipe are the A-A face cross section concept map of square-section;
Fig. 3 (a) is for forming steel pipe four block plate ends that the bight is nested, through ribbed, steel pipe are the A-A face schematic cross-section of square-section;
Fig. 3 (b) is for forming steel pipe four block plate ends that the middle part is nested, through ribbed, steel pipe are the A-A face schematic cross-section of square-section;
Fig. 4 (a) is that nested, the external formula in bight, steel pipe are the A-A face schematic cross-section of square-section for forming steel pipe four block plate ends;
Fig. 4 (b) is that nested, the external formula in middle part, steel pipe are the A-A face schematic cross-section of square-section for forming steel pipe four block plate ends;
Fig. 5 is for forming steel pipe four block plate ends that the bight is nested, bight formula, steel pipe are the A-A face schematic cross-section of square-section.
Number in the figure:
1-assembling steel plate; The 2-steel plate is nested; 3-steel plate end slide block; The nested fixedly rigidity of 4-steel plate bloom; The 5-core concrete; The 6-prestressed reinforcement; 7-presstressed reinforcing steel anchored end; 8-presstressed reinforcing steel anchor plate; 9-presstressed reinforcing steel anchorage bearing; The 10-steam vent.
The specific embodiment
The utility model provides a kind of assembling self-compaction steel tube-concrete composite structure, below by the description of drawings and the specific embodiment the utility model is described further.
The rectangular configuration of this combining structure for surrounding, and the core concrete 5 of portion's filling within it by assembling steel plate 1.The end of four blocks of assembling steel plates 1 is respectively equipped with steel plate end slide block 3, and mutually nested by the steel plate of both ends open nested 2 at the bight or the middle part of combining structure by steel plate end slide block 3, and can slide.Adjacent two described steel plates nested 2 are connected by the nested fixedly rigidity of steel plate bloom 4.At the steel pipe surrounded surface height that four blocks of assembling steel plates 1 are formed is on the X, Y direction in the cross section of 1000~2500mm, the a plurality of prestressed reinforcements 6 of symmetric arrangement, its prestressed reinforcement position and mode have 3 kinds: the one, and a plurality of vertically-displacable prestressed reinforcements of symmetric arrangement on the different cross section around combining structure, be referred to as vertically-displacable, as Fig. 2, shown in Figure 3; The 2nd, on outer wall around the combining structure different cross section, arrange 4 prestressed reinforcements, be referred to as external formula, as shown in Figure 4; The 3rd, on the bight of combining structure different cross section, be furnished with 4 prestressed reinforcements, be referred to as the bight formula, as shown in Figure 5.And on the outer wall of the end of every prestressed reinforcement 6 and described combining structure, presstressed reinforcing steel anchored end 7 and presstressed reinforcing steel anchor plate 8 are set, avoid local steel plate or concrete to destroy owing to stress of prestressed steel is concentrated, or the perk of steel plate end, presstressed reinforcing steel anchor plate 8 should be high rigidity steel plate, as shown in Figure 1; Simultaneously according to the size of sectional dimension, the quantity of arrangement prestress reinforcing bar on steel pipe differing heights and cross section reasonably, it is little to follow the cross section, and prestressed reinforcement is few, and the cross section is big, the arrangement principle that prestressed reinforcement is many.Because the special tectonic of four blocks of assembling steel plates 1, make it under the compressive pre-stress effect, can produce striction sport to four external surfaces of core concrete, produce compressive pre-stress, make the gas discharging in the steel pipe, and can remedy follow-up core concrete 5 surrounded surfaces owing to shrinking the slit that produces, avoid cross section internal force and system redistribution of internal force; It is prestressed to apply is to apply prestressing force again after having built core concrete, before the core concrete initial set, belongs to the unbonded prestressed concrete in the utilizing prestressing force post tensioning method, and the compressive pre-stress suggestion that its presstressed reinforcing steel produces is 0.2~1.0MPa.In addition, center symmetric arrangement height spacing h is that 800~1200mm, diameter d are the steam vent 10 of 12~15mm on the steel pipe walls that four blocks of assembling steel plates 1 are formed, as shown in Figure 1; This is because under the effect of presstressed reinforcing steel 6 constrictive forces, is beneficial to the discharging of steel duct gas, simultaneously also as the steam exhaust-gas hole 10 of fire preventing construction measure.Assembling steel plate 1 can be done striction sport to inside under the compressive pre-stress effect, producing compressive pre-stress can make the gas in the described combining structure discharge, and can remedy follow-up core concrete surrounded surface owing to shrinking the slit that produces, make core concrete be in the three-dimensional compressive stress state all the time.
When the cross section of this combining structure is being when changing between 200mm~2000mm to length in length and breadth, calculate according to also being no more than 200 μ ε about the steel tube concrete core concrete vertical and horizontal to the shrinkage value maximum at present, it is between 0.04~0.4mm shrinking the slit laterally, and the method that the mechanical system compensation core concrete that therefore adopts this patent and proposed shrinks can realize fully.
Concrete construction sequence and flow process are: assemble the steel pipe of being made up of four blocks of assembling steel plates at the construction field (site), on the prestressed reinforcement jack that the assembling steel plate is reserved, the assembling prestressed reinforcement, but do not apply prestressing force, only play the effect of tentatively fixing four blocks of assembling steel plates, after having built core concrete, apply prestressing force before the concrete initial set again, promptly adopt the unbonded prestressed concrete of utilizing prestressing force post tensioning method, its main stressing sequence is a prestressed reinforcement along lubricated anti-corrosion materials such as total length appearance brushing pitch → wrap plastic paper or sleeve pipe (prestressed reinforcement and concrete are not set up adhesion stress) → pouring concrete maintenance → tension reinforcing steel bar → anchoring.

Claims (5)

1. assembling self-compaction steel tube-concrete composite structure, the rectangular configuration of described combining structure for surrounding by the assembling steel plate, and the core concrete of portion's filling within it, it is characterized in that, the end of four blocks of assembling steel plates is respectively equipped with slide block, and described assembling steel plate is nested mutually nested by steel plate at the bight or the middle part of described combining structure by slide block; Two adjacent described steel plates are nested to be connected by the nested fixedly rigidity of steel plate bloom; On the varying cross-section in inside, outside or four bights of described combining structure, many prestressed reinforcements are set.
2. assembling self-compaction steel tube-concrete composite structure according to claim 1, it is characterized in that, described prestressed reinforcement highly is the position of 1000-2500mm around being arranged in described combining structure, adopt the symmetrical expression arrangement of layering, and the presstressed reinforcing steel anchored end is set on the outer wall of the end of every prestressed reinforcement, described combining structure.
3. assembling self-compaction steel tube-concrete composite structure according to claim 1 is characterized in that, on four faces of the outer wall of described combining structure the center be symmetrical arranged the height spacing be that 800~1200mm, diameter are the steam vent of 12~15mm.
4. assembling self-compaction steel tube-concrete composite structure according to claim 1 is characterized in that, described assembling steel plate is high-strength steel, ordinary steel or the stainless steel of yield strength more than 550MPa; Concrete is ordinary concrete or compressive strength high-strength concrete and the self-compacting concrete at 80~120MPa.
5. assembling self-compaction steel tube-concrete composite structure according to claim 1 is characterized in that the quantity of described prestressed reinforcement increases with the increase in described combining structure cross section.
CN2010205749894U 2010-10-18 2010-10-18 Assembled self-compaction steel tube concrete combined structure Expired - Lifetime CN201826439U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101982629A (en) * 2010-10-18 2011-03-02 清华大学 Assembly-type self-compaction steel tube and concrete composite structure
CN106032692A (en) * 2015-11-06 2016-10-19 广州容联建筑科技有限公司 Integral pouring molding construction method for reinforced concrete column

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101982629A (en) * 2010-10-18 2011-03-02 清华大学 Assembly-type self-compaction steel tube and concrete composite structure
CN106032692A (en) * 2015-11-06 2016-10-19 广州容联建筑科技有限公司 Integral pouring molding construction method for reinforced concrete column
CN106032692B (en) * 2015-11-06 2018-01-09 广州容联建筑科技有限公司 A kind of integral type pouring molding construction method of reinforced column

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