CN113622707A - Pre-tensioned crossed steel pull rod supporting and reinforcing reinforced concrete frame structure - Google Patents

Pre-tensioned crossed steel pull rod supporting and reinforcing reinforced concrete frame structure Download PDF

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Publication number
CN113622707A
CN113622707A CN202110978242.8A CN202110978242A CN113622707A CN 113622707 A CN113622707 A CN 113622707A CN 202110978242 A CN202110978242 A CN 202110978242A CN 113622707 A CN113622707 A CN 113622707A
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frame
column
pull rod
steel pull
steel
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CN113622707B (en
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刘航
韩明杰
罗爱武
杨学中
崔宏剑
杨建文
吴岳松
曾永璇
翟帅虎
范钰麟
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Beijing Building Construction Research Institute Co Ltd
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Beijing Building Construction Research Institute 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
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • 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
    • E04B1/30—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts being composed of two or more materials; Composite steel and concrete constructions
    • 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
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
    • 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
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • 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
    • 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
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E04G21/122—Machines for joining reinforcing bars
    • E04G21/123—Wire twisting tools
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
    • E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

The invention relates to a pre-tensioned crossed steel pull rod supporting reinforced concrete frame structure, wherein two steel pull rods (5) which are crossed are symmetrically arranged along the diagonal line of a frame unit formed by two adjacent frame columns (1) and an upper frame beam and a lower frame beam (2) in a reinforced frame structure plane, one end of each steel pull rod (5) is anchored at the top of one frame column (1), the other end of each steel pull rod is anchored at the bottom of the other adjacent frame column (1), and pre-tensioned lateral steel supports between the two frame columns (1) are formed by applying pre-stress to the two steel pull rods (5); the invention has less influence on the original building, the increase of the self weight of the structure is less, the reinforcement basically does not cause the reduction of the using area of the building, the noise of the construction site is low, the dust emission is less, and the construction is green and environment-friendly; and the interlaminar lateral stiffness, the seismic bearing capacity and the lateral deformation recovery capacity of the reinforced frame structure are effectively improved, so that the seismic toughness of the existing frame structure is improved.

Description

Pre-tensioned crossed steel pull rod supporting and reinforcing reinforced concrete frame structure
Technical Field
The invention relates to a building anti-seismic reinforcing structure, in particular to a technology for pre-tensioning crossed steel pull rod supporting and reinforcing reinforced concrete frame structure to perform anti-seismic reinforcement.
Background
At present, along with the improvement of people's standard of living day, the security requirement to housing construction is also higher and higher, housing construction's antidetonation is set up except that "the little shake that will satisfy the standard is not bad, and well shake can be repaiied, and big shake is not fallen"'s basic requirement, more should have good antidetonation toughness, can alleviate the damage in the earthquake, can resume its service function fast after the earthquake. Therefore, improving the earthquake toughness of buildings will be one of the most important development directions of current and future building development. For a large number of existing buildings, due to the influence of imperfect concept of earthquake fortification during construction at that time, most of the buildings have poor earthquake toughness, and the mechanism and the method for improving the earthquake toughness of the existing buildings are important subjects in the current engineering earthquake-resistant field.
The proportion of the reinforced concrete frame structure in the existing buildings in China is large, the seismic performance of some frame structure buildings cannot meet the basic requirements of seismic fortification, and collapse or serious damage is easy to occur under the action of strong earthquakes, so that casualties are caused; although other frame structure buildings can meet the three-level requirements of earthquake fortification, the problem of insufficient earthquake toughness also exists, and although the frame structure buildings can realize 'big earthquake resistance' under the action of a given level earthquake, the frame structure buildings cannot maintain and quickly recover the service function of the buildings.
The traditional anti-seismic reinforcing technology of the reinforced concrete frame structure mainly comprises a component direct reinforcing technology and a structural integral anti-seismic reinforcing technology. The direct reinforcement of the member refers to a reinforcement method for directly improving the bearing capacity or rigidity of the member by adopting reinforcement modes such as increasing the section of the member, wrapping profile steel, pasting carbon fiber and steel plates for the original structural member, and the integral seismic reinforcement of the structure refers to a reinforcement method for reducing the stress of the original structure by additionally arranging lateral force resistant members such as seismic walls, supports and the like inside and outside the structure. The buildings reinforced by the traditional methods dissipate earthquake energy mainly through the development of self cracking and plastic deformation of the buildings, and can realize 'big earthquake collapse', but the buildings generally have larger deformation which is difficult to recover in the earthquake, serious damage and poor repairability after the earthquake, so that the earthquake toughness is poor. Therefore, the research on the technology for improving the anti-seismic toughness of the existing reinforced concrete frame structure is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention designs a pre-tensioned crossed steel pull rod supporting reinforced concrete frame structure, which solves the technical problems that the traditional anti-seismic reinforcing technology of the existing reinforced concrete structure mainly dissipates seismic energy through cracks, damages and plastic deformation of a building structure, the building generally has larger deformation which is difficult to recover under the action of an earthquake, the damage is serious, the repairability after the earthquake is poor, the anti-seismic toughness is poor and the like.
In order to solve the technical problems, the invention adopts the following scheme:
the utility model provides a pretension cross steel pull rod supports and consolidates reinforced concrete frame structure which characterized in that: two steel pull rods which are arranged in a crossed mode are symmetrically arranged along the diagonal line of a frame unit formed by two adjacent frame columns and an upper frame beam and a lower frame beam in a reinforced frame structure plane, one end of each steel pull rod is anchored to the top of one frame column, the other end of each steel pull rod is anchored to the bottom of the other adjacent frame column, and pre-tensioning lateral steel supports between the two frame columns are formed by applying pre-stress to the two steel pull rods; the steel pull rod is subjected to prestress after being installed, and the prestress is large enough to ensure that the steel pull rod still keeps elasticity and is not stressed after rare earthquakes occur; the two steel pull rods which are arranged in a crossed mode are designed to keep elasticity under rare and extremely rare earthquakes, and the interlayer lateral stiffness, the anti-seismic bearing capacity and the lateral deformation recovery capacity of the reinforced frame structure are effectively improved, so that the anti-seismic toughness of the existing frame structure is improved.
Preferably, when the reinforced frame structure is located in a building, the frame column is reinforced by adopting a section increasing method, and the reinforced frame column is wrapped with the section increasing column to reduce the adverse effect of the prestress of the steel pull rod on the axial-compression ratio of the frame column.
Preferably, the column of increased cross-section extends through the upper floor to the bottom of the upper frame column, while extending through the lower floor to the lower part of the lower frame beam; the steel pull rods are arranged on two sides of the reinforced frame structure in pairs, the upper ends of the steel pull rods penetrate through the upper floor plate in an inclined mode, and the steel pull rods are anchored in the column with the enlarged cross section at the bottom of the upper column; and the lower end of the steel pull rod penetrates through the lower floor slab in an inclined mode and is anchored in the column with the enlarged cross section at the top of the lower column.
Preferably, the floor slabs on the upper layer and the lower layer are provided with through holes for the steel pull rods to pass through in an inclined manner, and gaps between the through holes on the floor slabs on the upper layer and the lower layer and the steel pull rods are filled with high-strength mortar or grouting material;
or/and the frame column, the frame beam and the floor slab in the reinforced frame structure are of a reinforced concrete structure formed by binding reinforcing steel bars, erecting a template and pouring concrete;
or/and the reinforced frame structure can be positioned at any floor of a multi-floor building and is enclosed by adjacent frame columns, the floor and the lower-floor frame beam;
or/and the upper end of the steel pull rod is anchored into an anchorage device at an tensioning end and the lower end of the steel pull rod is anchored into an anchorage device at a fixed end, and the anchorage device at the tensioning end and the anchorage device at the fixed end respectively adopt a nut type anchorage device and a clamping piece type anchorage device according to different materials of the steel pull rod;
or/and the steel pull rod is made of a high-strength carbon steel bar or a high-strength low-relaxation prestressed steel strand.
Preferably, when the reinforced frame structure is located at the edge of a building, the frame column is reinforced by adopting an externally-attached prefabricated frame structure, and the reinforced frame column is externally attached with the prefabricated frame column so as to reduce the adverse effect of the prestress of the steel pull rod on the axial compression ratio of the frame column.
Preferably, the external frame structure comprises a prefabricated frame column and a prefabricated frame beam which are connected by adopting rigid nodes, wherein the frame column is provided with a foundation and is arranged upwards from the foundation; the steel pull rod is arranged on the outer side of the reinforced frame structure along with the externally attached frame structure, the upper end of the steel pull rod obliquely penetrates through a reserved hole channel in the frame column and is anchored at a connecting node of the upper layer frame beam and the frame column; the lower end of the steel pull rod penetrates through a reserved hole channel in the frame column in an inclined mode and is anchored at a connecting node of the lower-layer frame beam and the frame column.
Preferably, a gap with the thickness of 10-20mm is reserved between the frame column and the externally attached frame column, the frame column and the externally attached frame column are filled and filled by adopting high-strength non-shrinkage grouting materials, the frame column and the externally attached frame column are connected by adopting an anchor bolt, one end of the anchor bolt is embedded into the frame column, the other end of the anchor bolt is inserted into a reserved hole of the frame column, and the exposed part is fastened by using a nut;
preferably, the steel pull rod is a high-strength carbon steel rod or a high-strength low-relaxation prestressed steel strand;
preferably, the upper end of the steel pull rod is anchored into an anchorage device at an tensioning end and the lower end of the steel pull rod is anchored into an anchorage device at a fixed end, and the anchorage device at the tensioning end and the anchorage device at the fixed end respectively adopt a nut type anchorage device and a clamping piece type anchorage device according to different materials of the steel pull rod;
preferably, the frame columns, the frame beams and the floor slabs in the reinforced frame structure are reinforced concrete structures formed by binding steel bars, erecting templates and pouring concrete;
preferably, the reinforced frame structure can be located at any floor of a multi-storey building, enclosed by adjacent frame posts and the floor and underlying frame beams.
A method for manufacturing a pre-tensioned crossed steel pull rod supporting reinforced concrete frame structure comprises the following steps when a frame column is reinforced by adopting a section increasing method:
step 1, measuring and paying off the periphery of a reinforced frame column, determining the size and the position of the section-enlarging column and the position of a tie bar of the section-enlarging column, and simultaneously determining the position of a steel pull rod penetrating through a floor slab, wherein the tie bar is used for fixing a steel bar framework of the section-enlarging column and the frame column in a tie manner, so that the cooperative work of the section-enlarging column and the frame column is facilitated to be enlarged;
step 2, performing base layer treatment on the surfaces of the frame columns, the frame beams and the floor slabs, which are in contact with the concrete of the column with the enlarged section, so as to ensure that the new concrete and the old concrete are tightly combined;
step 3, planting and fixing the tie bars of the columns with the enlarged cross sections on the frame columns, and punching holes on the floor slab at the intersection of the steel pull rods and the floor slab, wherein the hole diameters of the punched holes are required to ensure that the steel pull rods and the reserved holes thereof can smoothly pass through the holes;
step 4, binding and installing longitudinal steel bars and stirrups of the column with the enlarged cross section; wherein, the longitudinal bar should pass through the floor of the upper and lower floor and anchor according to the structure by adopting the back anchoring way, in the beam column node core area, the stirrup horizontally passes through the frame beam by adopting the back anchoring way and is bound or welded into a closed hoop;
step 5, the pore passages of the steel pull rods are reserved at the corresponding positions of the upper end and the lower end of the floor of the section column, and the pressure-bearing devices of the steel pull rods are embedded in advance, so that the steel pull rods can smoothly pass through and are installed;
step 6, checking and accepting the binding condition of the steel bars of the column with the enlarged cross section, arranging a template of the column with the enlarged cross section and pouring concrete after the binding condition is qualified, and removing the template and curing the concrete after the template removing strength is achieved;
step 7, after the concrete of the enlarged section column reaches the design strength through maintenance, processing and manufacturing steel pull rods and installing fixed-end anchors, obliquely installing the steel pull rods from bottom to top to enable the steel pull rods to sequentially pass through a reserved hole channel at the lower layer, a floor slab at the upper layer and a hole channel at the top of the column, enabling the two steel pull rods to be arranged in a crossed mode, and then installing tensioning-end anchors;
step 8, tensioning the steel pull rod according to design requirements, and cutting off the exposed steel pull rod of the anchor after tensioning is finished so that the length of the steel pull rod outside the anchor does not exceed 30 mm;
and 9, positioning the through hole on the floor outside the section of the column with the enlarged section, filling and sealing the through hole by adopting high-strength grouting material after the steel pull rod is installed and tensioned, and finally recovering the surface of each layer of ground and the beam column.
A method for manufacturing a pre-tensioned crossed steel pull rod supporting reinforced concrete frame structure comprises the following steps when a frame column is reinforced by an externally attached frame structure:
step 1, processing and manufacturing a prefabricated frame column and a prefabricated frame beam according to design drawings in a prefabricated part factory, embedding a pore channel and an anchoring pressure-bearing device for installing a steel pull rod in the frame column, ensuring that the steel pull rod can smoothly pass through and be installed, and embedding a pore channel for passing an anchor bolt, and ensuring that the anchor bolt can smoothly pass through and be fastened;
step 2, after the prefabricated frame columns and the prefabricated frame beams are transported to a construction site, assembling and connecting the prefabricated frame columns and the prefabricated frame beams on the ground to form a rigid frame structural unit;
step 3, performing base layer treatment on the surface of the frame column, which is in contact with the grouting material filled in the gap between the prefabricated frame columns, so as to ensure that the grouting material is tightly combined with the original concrete;
step 4, measuring and setting out on the frame column, determining the position of a connecting anchor bolt, drilling a hole on the frame column, implanting the connecting anchor bolt, and installing a positioning cushion block to ensure the formation of a gap between the frame column and the frame column;
step 5, hoisting and installing the frame structure unit assembled on the ground by using a lifting appliance, and ensuring that the anchor bolt can be accurately inserted into an anchor bolt hole reserved in the frame column to fasten the anchor bolt;
step 6, supporting a formwork for a gap between the frame column and the frame column, and pouring grouting material to ensure that the gap is full of filling;
step 7, after the grouting material in the gap is maintained to reach the designed strength, processing and manufacturing steel pull rods, installing fixed-end anchors, obliquely installing the steel pull rods from bottom to top to enable the steel pull rods to sequentially penetrate through reserved pore passages at the column bottom and reserved pore passages at the column top, then installing tensioning-end anchors, and enabling the two steel pull rods to be arranged in a crossed mode;
step 8, tensioning the steel pull rod according to design requirements, and cutting off the exposed steel pull rod of the anchor after tensioning is finished so that the length of the steel pull rod outside the anchor does not exceed 30 mm;
and 9, sealing the end part of the steel pull rod by adopting high-strength grouting material, and finally recovering the surface of the beam column.
After the existing reinforced concrete frame structure building is reinforced by adopting the scheme of the invention, compared with a frame structure reinforced by adopting the traditional reinforcing technology, the reinforced concrete frame structure building has the following beneficial effects:
(1) the pre-tensioned crossed steel pull rod provided by the invention supports and reinforces the reinforced concrete frame structure, the reinforced frame structure becomes a supporting frame structure, the interlaminar lateral stiffness and the seismic bearing capacity of the frame structure can be effectively improved, and the reinforced structure can be designed to keep elasticity under a middle earthquake through a performance reinforcing design method, so that the seismic toughness of the structure is improved.
(2) The crossed steel pull rod can adopt high-strength carbon steel bars or unbonded high-strength low-relaxation steel stranded wires wrapped with anti-corrosion lubricating grease and polyethylene sheaths, and is designed to be in an elastic tension working state under rare earthquakes and extremely rare earthquakes, so that the lateral deformation recovery capability of the structure is provided, and the anti-seismic toughness of the existing reinforced concrete frame structure is remarkably improved.
(3) The invention has less influence on the original building, less increase of the self weight of the structure, basically no reduction of the using area of the building caused by reinforcement, low noise of a construction site, less dust emission and green and environment-friendly construction.
Drawings
FIG. 1: the invention discloses a vertical schematic view of an embodiment 1 of a pre-tensioned crossed steel pull rod supporting and reinforcing reinforced concrete frame structure;
FIG. 2: FIG. 1 is a schematic horizontal cross-sectional view;
FIG. 3: FIG. 1 is a schematic side cross-sectional view;
FIG. 4: the vertical view of an embodiment 2 of the pre-tensioned crossed steel pull rod supporting and reinforcing reinforced concrete frame structure is schematically shown;
FIG. 5: FIG. 4 is a schematic horizontal cross-sectional view;
FIG. 6: fig. 4 is a schematic side sectional view.
Description of reference numerals:
1-frame column; 2-frame beam; 3, a floor slab; 4-increasing the cross-section of the column; 5-a steel pull rod; 6, perforating the floor slab; 7-tensioning end anchorage; 8-frame column; 9-frame beam; 10-clearance; 11-anchor bolt; 12-a fixed end anchorage; 13-longitudinal reinforcement; 14-increase the section column stirrup; 15-increase the section column tie bar.
Detailed Description
The invention is further described below with reference to fig. 1 to 6:
example 1: as shown in fig. 1 and 3, the reinforced concrete frame structure is supported and reinforced by pre-tensioned cross steel tie rods, and the frame structure is reinforced by cross steel tie rods 5 arranged along the diagonal line in the plane of the reinforced single frame structure.
The two steel pull rods 5 which are arranged in a crossed mode are designed to keep elasticity under rare earthquakes and extremely rare earthquakes, and the interlayer lateral stiffness, the anti-seismic bearing capacity and the lateral deformation recovery capacity of the reinforced frame structure are effectively improved, so that the anti-seismic toughness of the existing frame structure is improved.
The purpose of keeping elasticity is to ensure that the building has the self-resetting capability after a major earthquake, and the building can be pulled back like a rubber band. The method for realizing the 'elasticity keeping' is that during the structure design, under the action of a given fortification intensity earthquake, the tensile force born by the pull rod under the rare and extremely rare earthquakes is calculated, if the stress converted by the tensile force exceeds the yield strength of the pull rod, the stress value is smaller than the yield strength by methods of adjusting the section area of the pull rod and the like, the pull rod is kept in an elastic state, and no plastic residual strain exists during unloading.
As shown in fig. 1, when the reinforced frame structure is located inside a building, the frame column 1 is preferably reinforced by adopting a section enlarging method, and the reinforced frame column 1 is wrapped with a section enlarging column 4 to reduce the adverse effect of the prestress of the steel pull rod 5 on the axial compression ratio of the frame column 1. The method comprises the steps of reinforcing a frame column 1 by an enlarged section method, firstly measuring and setting out during construction, determining the size and the position of an enlarged section column 4, planting bars on tie bars 15 of the enlarged section column 4 on the frame column 1 for fixation, binding and installing longitudinal steel bars 13 and stirrups 14 of the enlarged section column 4, wherein the longitudinal steel bars 13 penetrate an upper floor slab 3 and a lower floor slab 3 in a post-anchoring mode and are anchored according to the structure, and the stirrups 14 penetrate a frame beam 2 horizontally in the post-anchoring mode and are bound or welded to form closed hoops in a beam-column node core area. The corresponding positions of the upper end and the lower end of the floor of the section-enlarging column 4 are provided with pore channels and the bearing devices of the steel pull rods 5 are embedded, so that the steel pull rods 5 can smoothly pass through and be installed, and after the installation of the section-enlarging column steel bars, the pore channels and the bearing plates is finished, templates are erected and concrete is poured; after the concrete of the enlarged section column 4 reaches the design strength through maintenance, the crossed steel pull rod 5 is installed according to the design position, and prestress is applied to the steel pull rod 5 and the steel pull rod is anchored. The steel tie rod 5 penetrates through the floor slab 3, a through hole 6 is formed in the corresponding position of the floor slab 3 in advance, and the through hole 6 is filled and sealed by high-strength grouting material after the steel tie rod 5 is installed and tensioned.
Example 2: as shown in fig. 4-6, when the reinforced frame structure is located at the edge of a building, the frame column 1 may also be reinforced by using an externally attached prefabricated frame structure, and the reinforced frame column 1 is externally attached with a prefabricated frame column 8, so as to reduce the adverse effect of the prestress of the steel tie bar 5 on the axial compression ratio of the frame column 1. Processing and manufacturing a prefabricated frame column 8 and a prefabricated frame beam 9 in a prefabricated part factory, and reserving a pore channel and an anchoring pressure-bearing device for mounting the steel pull rod 5 in the frame column 8; after the prefabricated frame column 8 and the prefabricated frame beam 9 are transported to a construction site, the prefabricated frame column 8 and the prefabricated frame beam 9 are assembled and connected on the ground to form a rigid frame structure. Measuring and paying off on the frame column 1, determining the position of a connecting anchor bolt 11, drilling the frame column 1, implanting the connecting anchor bolt 11, and installing a positioning cushion block to ensure the formation of a gap 10 between the frame column 8 and the frame column 1; the frame structure assembled on the ground is lifted and installed by a crane, and the anchor bolt 11 can be accurately inserted into the anchor bolt hole reserved in the frame column 8 to fasten the anchor bolt 11. And (3) supporting a formwork for the gap 10 between the frame column 1 and the frame column 8, pouring grouting material, and ensuring that the gap 10 is filled and filled. And after the grouting material in the gap 10 is maintained to reach the designed strength, installing crossed steel pull rods 5 according to the designed positions, and applying prestress to the steel pull rods 5 and anchoring.
The embodiment 1 is mainly different from the embodiment 2 in workability of construction. The prefabricated frame column is adopted for reinforcement, so that field wet operation can be reduced, the green and low-carbon effects are achieved, but the prefabricated frame column needs a large crane for field hoisting and can only be used for reinforcement of the outer side of a building; the internal frame cannot be reinforced by such prefabricated assembly because the crane cannot enter the frame. The reinforcement of the method for increasing the section can be used for the interior of a building and also for an edge frame, but the method is mainly used for wet operation and is not green enough. Therefore, the invention provides two implementation means at the same time.
When the frame column 1 is reinforced by adopting the method of increasing the section, the method comprises the following specific implementation steps: step 1, measuring and paying off around a reinforced frame column 1, determining the size and the position of the section-enlarging column 4 and the position of a tie bar 15 of the section-enlarging column 4, and simultaneously determining the position of a steel pull rod penetrating through a floor slab, wherein the tie bar 15 is used for fixing a steel bar framework with the section-enlarging section and the frame column in a tie manner, so that the cooperative work of the section-enlarging column 4 and the frame column 1 is facilitated to be increased;
step 2, performing base layer treatment on the surfaces of the frame columns 1, the frame beams 2 and the floor slabs 3, which are in contact with the concrete of the enlarged section columns 4, so as to ensure that the new concrete and the old concrete are tightly combined;
step 3, planting and fixing tie bars 15 of the column 4 with the enlarged cross section on the frame column 1, forming through holes 6 on the floor slab 3 at the intersection of the steel pull rods 5 and the floor slab 3, wherein the aperture size of the through holes 6 is required to ensure that the steel pull rods 5 and reserved holes thereof can smoothly pass through;
step 4, binding and installing longitudinal steel bars 13 and stirrups 14 of the column 4 with the enlarged cross section; wherein, the longitudinal bar 13 should adopt the back anchoring mode to cross the floor 3 of the upper and lower floor and anchor according to the structure, in the beam column node core area, the stirrup 14 adopts the back anchoring mode to cross the frame beam 2 horizontally and bind or weld as the closed hoop;
step 5, increasing the corresponding positions of the section columns 4 at the upper end and the lower end of the floor, reserving a pore channel of the steel pull rod 5, and embedding a pressure-bearing device of the steel pull rod 5 in advance to ensure that the steel pull rod 5 can smoothly pass through and be installed;
step 6, checking and accepting the binding condition of the steel bars of the section-enlarging column 4, setting a template of the section-enlarging column 4 after the binding condition is qualified, pouring concrete, and removing the template and curing the concrete after the template removal strength is achieved;
step 7, after the concrete of the enlarged section column 4 reaches the design strength through maintenance, processing and manufacturing a steel pull rod 5 and installing a fixed-end anchorage 12, obliquely installing the steel pull rod 5 from bottom to top so as to enable the steel pull rod 5 to sequentially pass through a reserved hole at the lower layer, a floor slab 3 at the upper layer and a column top hole, arranging the two steel pull rods 5 in a crossed manner, and then installing a tensioning-end anchorage 7;
step 8, tensioning the steel pull rod 5 according to design requirements, and cutting off the exposed steel pull rod of the anchor 7 after tensioning is finished so that the length of the steel pull rod outside the anchor does not exceed 30 mm;
and 9, positioning the through hole 6 on the floor slab 3 outside the section of the enlarged section column 4, filling and sealing the through hole 6 by adopting high-strength grouting material after the steel pull rod 5 is installed and tensioned, and finally recovering the surface of each layer of ground and beam column.
When the frame column 1 is reinforced by adopting an external frame structure, the method comprises the following specific implementation steps:
step 1, processing and manufacturing a prefabricated frame column 8 and a prefabricated frame beam 9 according to a design drawing in a prefabricated part factory, embedding a pore channel and an anchoring pressure-bearing device for installing a steel pull rod 5 in the frame column 8 to ensure that the steel pull rod 5 can smoothly pass through and be installed, and embedding a pore channel for an anchor bolt 11 to pass through simultaneously to ensure that the anchor bolt 11 can smoothly pass through and be fastened;
step 2, after the prefabricated frame column 8 and the prefabricated frame beam 9 are transported to a construction site, assembling and connecting the prefabricated frame column 8 and the prefabricated frame beam 9 on the ground to form a rigid frame structural unit;
step 3, performing base layer treatment on the surface of the frame column 1, which is to be in contact with the grouting material poured into the gap 10 between the prefabricated frame columns 8, so as to ensure that the grouting material is tightly combined with the original concrete;
step 4, measuring and setting out on the frame column 1, determining the position of a connecting anchor bolt 11, drilling the frame column 1, implanting the connecting anchor bolt 11, and installing a positioning cushion block to ensure the formation of a gap 10 between the frame column 8 and the frame column 1;
step 5, hoisting and installing the frame structure unit assembled on the ground by using a lifting appliance, ensuring that the anchor bolt 11 can be accurately inserted into an anchor bolt hole reserved in the frame column 8, and fastening the anchor bolt 11;
step 6, a formwork is erected on a gap 10 between the frame column 1 and the frame column 8, grouting materials are poured, and the gap 10 is guaranteed to be filled and filled;
step 7, after the grouting material in the gap 10 is maintained to reach the designed strength, processing and manufacturing the steel pull rod 5, installing a fixed-end anchorage device 12, obliquely installing the steel pull rod 5 from bottom to top so as to enable the steel pull rod 5 to sequentially pass through a reserved hole channel at the column bottom and a reserved hole channel at the column top, then installing a tensioning-end anchorage device 7, and arranging the two steel pull rods 5 in a crossed manner;
step 8, tensioning the steel pull rod 5 according to design requirements, and cutting off the exposed steel pull rod of the anchor 7 after tensioning is finished so that the length of the steel pull rod outside the anchor does not exceed 30 mm;
and 9, sealing the end part of the steel pull rod by adopting high-strength grouting material, and finally recovering the surface of the beam column.
The invention relates to a pre-tensioned crossed steel pull rod supporting reinforced concrete frame structure, wherein crossed steel pull rods are symmetrically arranged along the diagonal line of a frame unit formed by adjacent frame columns and frame beams in the plane of a reinforced single-frame structure, the corresponding frame columns can be reinforced by adopting an increased cross section method or externally attached prefabricated frame columns, one end of each steel pull rod is anchored at the top of each frame column, the other end of each steel pull rod is anchored at the bottom of the adjacent frame column, and pre-tensioned lateral steel supports among the frame columns are formed by applying pre-stress to the steel pull rods. The crossed steel pull rod support is designed to keep elasticity under rare and extremely rare earthquakes, so that the self-resetting capability of the structure after earthquake deformation is provided, and the interlayer displacement of the frame structure can be recovered automatically to a large extent. The crossed pre-tensioned steel pull rod supporting and reinforcing reinforced concrete frame structure provided by the invention can effectively improve the interlayer lateral stiffness, the anti-seismic bearing capacity and the lateral deformation recovery capacity of the frame structure, is simple and convenient to construct, has small influence on the structure, and is an effective means for improving the anti-seismic toughness of the existing frame structure.
The invention is described above with reference to the accompanying drawings, it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.

Claims (10)

1. The utility model provides a pretension cross steel pull rod supports and consolidates reinforced concrete frame structure which characterized in that: in a reinforced frame structure plane, two steel pull rods (5) which are arranged in a crossed mode are symmetrically arranged along the diagonal line of a frame unit formed by two adjacent frame columns (1) and an upper frame beam and a lower frame beam (2), one end of each steel pull rod (5) is anchored to the top of one frame column (1), the other end of each steel pull rod is anchored to the bottom of the other adjacent frame column (1), and pre-tensioned lateral steel supports between the two frame columns (1) are formed by applying pre-stress to the two steel pull rods (5); the steel pull rod (5) is applied with prestress after being installed, and the prestress is large enough to ensure that the steel pull rod (5) still keeps elasticity and is not stressed after rare earthquakes occur; the two steel pull rods (5) which are arranged in a crossed mode are designed to keep elasticity under the condition of rare earthquakes and extremely rare earthquakes, and the interlayer lateral stiffness, the anti-seismic bearing capacity and the lateral deformation recovery capacity of the reinforced frame structure are effectively improved, so that the anti-seismic toughness of the existing frame structure is improved.
2. The pre-tensioned cross-steel tie bar support reinforced concrete frame structure of claim 1, wherein:
when the reinforced frame structure is positioned in a building, the frame column (1) is reinforced by adopting a section increasing method, and the periphery of the reinforced frame column (1) is wrapped with the section increasing column (4) so as to reduce the adverse effect of the prestress of the steel pull rod (5) on the axial-compression ratio of the frame column (1).
3. A pre-tensioned cross-steel tie-bar support reinforced concrete frame structure according to claim 2, wherein:
the column (4) with the enlarged cross section penetrates through the upper floor (3) and extends to the bottom of the upper frame column (1), and simultaneously penetrates through the lower floor (3) and extends to the lower part of the lower frame beam (2); the steel pull rods (5) are arranged on two sides of the reinforced frame structure in pairs, the upper ends of the steel pull rods penetrate through the upper floor (3) in an inclined mode, and the steel pull rods are anchored in the columns (4) with the enlarged cross sections at the bottoms of the upper columns; the lower end of the steel pull rod (5) penetrates through the lower floor slab (3) in an inclined mode and is anchored in the column (4) with the enlarged cross section at the top of the lower column.
4. A pre-tensioned cross-steel tie rod supporting reinforced concrete frame structure according to claims 2-3, characterised in that:
through holes (6) for the steel pull rods (5) to pass through obliquely are formed in the upper floor slab (3) and the lower floor slab (3), and gaps between the through holes (6) in the upper floor slab (3) and the lower floor slab (3) and the steel pull rods (5) are filled with high-strength mortar or grouting material;
or/and the frame column (1), the frame beam (2) and the floor slab (3) in the reinforced frame structure are reinforced concrete structures formed by binding reinforcing steel bars, erecting templates and pouring concrete;
or/and the reinforced frame structure can be positioned at any floor of a multi-storey building and is enclosed by adjacent frame columns (1) and the floor and lower-layer frame beams (2);
or/and the upper end of the steel pull rod (5) is anchored into an anchorage device (7) at an tensioning end, the lower end of the steel pull rod (5) is anchored into an anchorage device (12) at a fixed end, and the anchorage device (7) at the tensioning end and the anchorage device (12) at the fixed end are respectively a nut anchorage device and a clamping piece anchorage device according to different materials of the steel pull rod;
or/and the steel pull rod (5) adopts a high-strength carbon steel bar or a high-strength low-relaxation prestressed steel strand.
5. The pre-tensioned cross-steel tie bar support reinforced concrete frame structure of claim 1, wherein:
when the reinforced frame structure is positioned at the edge of a building, the frame column (1) is reinforced by adopting an externally attached prefabricated frame structure, and the reinforced frame column (1) is externally attached with a prefabricated frame column (8) so as to reduce the adverse effect of the prestress of the steel pull rod (5) on the axial compression ratio of the frame column (1).
6. The pre-tensioned cross-steel tie bar support reinforced concrete frame structure of claim 5, wherein:
the external frame structure comprises a prefabricated frame column (8) and a prefabricated frame beam (9), the prefabricated frame column and the prefabricated frame beam are connected by adopting rigid nodes, the frame column (8) is provided with a foundation and is arranged upwards from the foundation; the steel pull rod (5) is arranged on the outer side of the reinforced frame structure along with the externally attached frame structure, the upper end of the steel pull rod obliquely penetrates through a reserved hole channel in the frame column (8) and is anchored at the connecting node of the upper layer frame beam (9) and the frame column (8); the lower end of the steel pull rod (5) obliquely penetrates through a reserved hole channel in the frame column (8) and is anchored at the joint of the lower-layer frame beam (9) and the frame column (8).
7. The pre-tensioned cross-steel tie bar support reinforced concrete frame structure of claim 6, wherein: a10-20 mm thick gap (10) is reserved between the frame column (1) and the externally attached frame column (8), high-strength non-shrinkage grouting materials are adopted for filling, the frame column (1) and the externally attached frame column (8) are connected through an anchor bolt (11), one end of the anchor bolt (11) is embedded into the frame column (1), the other end of the anchor bolt is inserted into a reserved hole of the frame column (8), and the exposed part of the anchor bolt is fastened through a nut.
8. A pre-tensioned cross-steel tie rod supporting reinforced concrete frame structure according to claims 5-7, wherein:
the steel pull rod (5) adopts a high-strength carbon steel bar or a high-strength low-relaxation prestressed steel strand;
or/and the upper end of the steel pull rod (5) is anchored into an anchorage device (7) at an tensioning end, the lower end of the steel pull rod (5) is anchored into an anchorage device (12) at a fixed end, and the anchorage device (7) at the tensioning end and the anchorage device (12) at the fixed end are respectively a nut anchorage device and a clamping piece anchorage device according to different materials of the steel pull rod;
or/and the frame column (1), the frame beam (2) and the floor slab (3) in the reinforced frame structure are reinforced concrete structures formed by binding reinforcing steel bars, erecting templates and pouring concrete;
or/and the reinforced frame structure can be positioned at any floor of a multi-floor building and is enclosed by adjacent frame columns (1) and the floor and lower-layer frame beams (2).
9. A method for manufacturing a pre-tensioned crossed steel pull rod supporting reinforced concrete frame structure comprises the following steps when a frame column (1) is reinforced by adopting an enlarged section method:
step 1, measuring and paying off the periphery of a reinforced frame column (1), determining the size and the position of an enlarged section column (4) and the position of a tie bar (15) of the enlarged section column (4), and simultaneously determining the position of a steel pull rod penetrating through a floor slab, wherein the tie bar (15) is used for fixing a steel bar framework with an enlarged section with the frame column in a tie manner, so that the cooperative work of the enlarged section column (4) and the frame column (1) is facilitated;
step 2, performing base layer treatment on the surfaces of the frame columns (1), the frame beams (2) and the floor slabs (3) which are in contact with the concrete of the column (4) with the enlarged cross section, and ensuring that the new concrete and the old concrete are tightly combined;
step 3, planting bars on the tie bars (15) of the column (4) with the enlarged section on the frame column (1), and punching holes (6) on the floor (3) at the intersection of the steel pull rod (5) and the floor (3), wherein the aperture size of the punching holes (6) is required to ensure that the steel pull rod (5) and the reserved hole thereof can smoothly pass through the holes;
step 4, binding and installing longitudinal steel bars (13) and stirrups (14) of the column (4) with the enlarged cross section; wherein, the longitudinal bar (13) should adopt the back anchoring mode to cross the floor (3) of the upper and lower floor and anchor according to the structure, in the beam column node core area, the stirrup (14) adopts the back anchoring mode to cross the frame beam (2) horizontally and bind or weld as the closed stirrup;
step 5, increasing the corresponding positions of the section columns (4) at the upper end and the lower end of the floor, reserving a pore channel of the steel pull rod (5) and embedding a pressure-bearing device of the steel pull rod (5) in advance, and ensuring that the steel pull rod (5) can smoothly pass through and be installed;
step 6, checking and accepting the binding condition of the steel bars of the section-enlarging column (4), setting a template of the section-enlarging column (4) and pouring concrete after the binding condition is qualified, and removing the template and curing the concrete after the template removal strength is reached;
step 7, after the concrete of the enlarged section column (4) reaches the designed strength through maintenance, processing and manufacturing a steel pull rod (5) and installing a fixed end anchorage device (12), installing the steel pull rod (5) from bottom to top in an inclined mode, enabling the steel pull rod to sequentially penetrate through a reserved hole in the lower layer, a floor slab (3) in the upper layer and a hole in the top of the column, enabling the two steel pull rods (5) to be arranged in a crossed mode, and then installing a tensioning end anchorage device (7);
step 8, tensioning the steel pull rod (5) according to design requirements, and cutting off the exposed steel pull rod of the anchor (7) after tensioning is finished so that the length of the steel pull rod outside the anchor does not exceed 30 mm;
and 9, arranging a through hole (6) in the floor (3) outside the section of the enlarged section column (4), filling and sealing the through hole (6) by adopting high-strength grouting material after the installation and tensioning of the steel pull rod (5) are finished, and finally recovering the surface of each layer of ground and the beam column.
10. A method for manufacturing a pre-tensioned crossed steel pull rod supporting reinforced concrete frame structure comprises the following steps when a frame column (1) is reinforced by an externally attached frame structure:
step 1, processing and manufacturing a prefabricated frame column (8) and a prefabricated frame beam (9) according to a design drawing in a prefabricated part factory, embedding a pore channel and an anchoring pressure-bearing device which are installed on a steel pull rod (5) in the frame column (8), ensuring that the steel pull rod (5) can smoothly pass through and be installed, and embedding a pore channel through which an anchor bolt (11) passes simultaneously, ensuring that the anchor bolt (11) can smoothly pass through and be fastened;
step 2, after the prefabricated frame column (8) and the prefabricated frame beam (9) are transported to a construction site, assembling and connecting the prefabricated frame column (8) and the prefabricated frame beam (9) on the ground to form a rigid frame structural unit;
step 3, performing base layer treatment on the surface of the frame column (1) to be in contact with the grouting material poured into the gap (10) between the prefabricated frame columns (8) to ensure that the grouting material is tightly combined with the original concrete;
step 4, measuring and paying off the frame column (1), determining the position of a connecting anchor bolt (11), drilling the frame column (1) and implanting the connecting anchor bolt (11), and installing a positioning cushion block to ensure the formation of a gap (10) between the frame column (8) and the frame column (1);
step 5, hoisting and installing the frame structure unit assembled on the ground by using a lifting appliance, and ensuring that the anchor bolt (11) can be accurately inserted into an anchor bolt hole reserved in the frame column (8) to fasten the anchor bolt (11);
step 6, a formwork is supported in a gap (10) between the frame column (1) and the frame column (8), grouting materials are poured, and the gap (10) is filled with filling materials;
step 7, after the grouting material in the gap (10) is maintained to reach the designed strength, processing and manufacturing a steel pull rod (5), installing a fixed-end anchor (12), obliquely installing the steel pull rod (5) from bottom to top to enable the steel pull rod to sequentially penetrate through a reserved hole channel at the column bottom and a reserved hole channel at the column top, then installing a tensioning-end anchor (7), and arranging the two steel pull rods (5) in a crossed manner;
step 8, tensioning the steel pull rod (5) according to design requirements, and cutting off the exposed steel pull rod of the anchor (7) after tensioning is finished so that the length of the steel pull rod outside the anchor does not exceed 30 mm;
and 9, sealing the end part of the steel pull rod by adopting high-strength grouting material, and finally recovering the surface of the beam column.
CN202110978242.8A 2021-08-25 2021-08-25 Pre-tensioned crossed steel pull rod supporting and reinforcing reinforced concrete frame structure Active CN113622707B (en)

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CN110644806A (en) * 2019-10-22 2020-01-03 东南大学 External prestress assembly type concrete frame-energy dissipation support reinforcing structure of existing structure
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CN106088640A (en) * 2016-06-03 2016-11-09 河海大学 The method that existing frame structure is carried out demolishing columns
KR101894917B1 (en) * 2018-01-22 2018-09-04 천종우 Structure for earthquake proofing and reinforcing RC structure using steel frame attached by steel plate
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CN115075605A (en) * 2022-07-06 2022-09-20 舜元建设(集团)有限公司 Construction method of old house reconstruction structure and old house reconstruction structure
CN115075605B (en) * 2022-07-06 2023-12-29 舜元建设(集团)有限公司 Construction method of old house reconstruction structure and old house reconstruction structure

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