CN106088657A - The ruggedized construction of a kind of rowlock wall body and construction method thereof - Google Patents

The ruggedized construction of a kind of rowlock wall body and construction method thereof Download PDF

Info

Publication number
CN106088657A
CN106088657A CN201610627100.6A CN201610627100A CN106088657A CN 106088657 A CN106088657 A CN 106088657A CN 201610627100 A CN201610627100 A CN 201610627100A CN 106088657 A CN106088657 A CN 106088657A
Authority
CN
China
Prior art keywords
steel plate
rowlock
band
steel
angle steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610627100.6A
Other languages
Chinese (zh)
Other versions
CN106088657B (en
Inventor
王修华
张晨
杨放
沈玉石
管绍荣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CONSTRUCTION ENGINEERING TECHNOLOGY Co Ltd NANJING UNIVERSITY OF TECHNOLOGY
Lianyungang Housing Safety Appraisal Management Center
Nanjing University of Science and Technology
Original Assignee
CONSTRUCTION ENGINEERING TECHNOLOGY Co Ltd NANJING UNIVERSITY OF TECHNOLOGY
Lianyungang Housing Safety Appraisal Management Center
Nanjing University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CONSTRUCTION ENGINEERING TECHNOLOGY Co Ltd NANJING UNIVERSITY OF TECHNOLOGY, Lianyungang Housing Safety Appraisal Management Center, Nanjing University of Science and Technology filed Critical CONSTRUCTION ENGINEERING TECHNOLOGY Co Ltd NANJING UNIVERSITY OF TECHNOLOGY
Priority to CN201610627100.6A priority Critical patent/CN106088657B/en
Publication of CN106088657A publication Critical patent/CN106088657A/en
Application granted granted Critical
Publication of CN106088657B publication Critical patent/CN106088657B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • E04G23/0222Replacing or adding wall ties

Abstract

The invention discloses ruggedized construction and the construction method thereof of a kind of rowlock wall body, including rowlock wall body, angle steel, steel plate band, short steel plate, long steel plate strip, to wearing bolt and chemical anchor bolts;The both sides metope of described rowlock wall body is respectively equipped with the most vertical a plurality of steel plate band, and the metope upper end, both sides of rowlock wall body is respectively equipped with the angle steel of transverse horizontal;Described steel plate band and angle steel are all bondd with rowlock wall body by structure glue, and by wearing bolt anchoring;Described angle steel one limb is concordant with rowlock wall body upper surface, and another limb of angle steel docks concordant with steel plate band, and bond above angle steel and steel plate band joint short steel plate, and by wearing bolt anchoring;The bottom surface of described rowlock wall body uses structure glue bonding ground, is provided with, outside described steel plate strip band lower end, the long steel plate strip preventing steel plate band to be displaced outwardly, and long steel plate strip is anchored by chemical anchor bolts with ground.The present invention is not only suitable for the solid wall with or without collar tie beam, is also applied for rowlock wall body.

Description

The ruggedized construction of a kind of rowlock wall body and construction method thereof
Technical field
The invention belongs to build field of reinforcement, relate to buildings in general and reinforce and construction method, be specifically related to be suitable for always Old building strengthening transformation system, particularly to brick masonry structure.
Background technology
Many buildings as time goes by, can cause serviceability to decline because of deterioration, damage, or because technical conditions limit System cannot be continuing with.At this moment, according to present situation, it should be repaired, reinforce and reforming processing, with satisfied use requirement.Self-built Since state, masonry structure is promoted on a large scale in China, has built the buildings such as substantial amounts of house, schoolhouse, factory, but by working as Time economic condition, construction technology and equipment etc. restriction, the building materials low strength such as brick, mortar, code requirement is on the low side, adds Disaster that serviceability limit stage is likely to occur and the impact of ageing step issuable various damage accumulations, cause structure Drag weakens, durability reduces;Along with the development of science and technology, the increase of masonry service life, and construction standards is the most perfect, The masonry structures such as the house of early stage construction, schoolhouse can not meet requirement.
On the other hand, the house still having more than 80% at present in the vast Urban Areas of China is masonry structure building, and absolutely Major part is built in the seventies and eighties in last century, and due to expensive expense of tearing down and building, dismounting can cause the pollution of environment, building waste Increase and make troubles people's order orthobiosis etc. problem, so can't all empty bucket buildings being unsatisfactory for requiring be torn open Except rebuilding.Relevant investigation display, reinforce than newly-built can investment reduction about 40%, the reduction of erection time about 50%, the speed recouped capital outlay Than newly-built structure fast 1.3~1.4 times, the house after appraisal and strengthening is the most safe and reliable, and can extend service life, increasingly By concern and the favor of people, the Testing and appraisal of China develops increasingly maturation with reinforcing in theory and practice, thus right Existing masonry structure carries out comprehensive Testing and appraisal and reinforces necessary.
Increasing along with reinforcing the further of building ratio, structural strengthening technology has obtained rapidly at aspects such as theory and practice Development.At present, the method for common reinforcing mainly has: 1) reinforcing steel net shell method for strengthening, and 2) armored concrete board wall method for strengthening, 3) fibrous composite method set up collar tie beam, reinforcing pull rod method for strengthening, 4) cement grout patching, 5) is pasted, 6) peripheral hardware reinforced concrete Earth pillar method, 7) method such as prestressing;These reinforcement means can improve the bearing capacity of structure to a certain extent, improves The ductility of structure and anti-seismic performance, meet the predetermined requirement using function, but these method for strengthening to there is construction method loaded down with trivial details, the cycle Long, wet trade operates, and takies space big, increases deadweight, pollutes environment, on shortcomings such as the impact of people's daily life are bigger. And using steel plate strip to reinforce the deficiency that can improve above-mentioned reinforcement means, steel plate reinforcement has dry Job Operations, easy construction, the duration Short, take construction area hardly, people's daily life is affected the advantages such as less.
Summary of the invention
It is an object of the invention to for deficiencies of the prior art, it is provided that the ruggedized construction of a kind of rowlock wall body and Its construction method, the method can effectively solve the problem that bearing capacity of wall body is not enough, further enhance globality and the resistance to compression of body of wall Bearing capacity.
The technical solution used in the present invention is: the ruggedized construction of a kind of rowlock wall body, including rowlock wall body, angle steel, steel plate Band, short steel plate, long steel plate strip, to wearing bolt and chemical anchor bolts;
The both sides metope of described rowlock wall body is respectively equipped with the most vertical a plurality of steel plate band, the both walls of rowlock wall body Upper end, face is respectively equipped with the angle steel of transverse horizontal;Described steel plate band and angle steel are all bondd with rowlock wall body by structure glue, and By to wearing bolt anchoring;Described angle steel one limb is concordant with rowlock wall body upper surface so that upper load reaches on same plane, Angle steel and the common stress of rowlock wall body, another limb of angle steel docks concordant with steel plate band so that load is transferred to steel plate band, angle Bond above steel and steel plate band joint short steel plate, and by wearing bolt anchoring;
The bottom surface of described rowlock wall body uses structure glue bonding ground, is provided with and prevents outside described steel plate strip band lower end The long steel plate strip that steel plate band is displaced outwardly, long steel plate strip is anchored by chemical anchor bolts with ground.
As preferably, described rowlock wall body includes that three dormancies are a pipeful of, five sleeps bucket type rowlock wall bodies a pipeful of, complete.
As preferably, lay bricks and affixing steel plate band, i.e. steel plate are answered in bucket junction of laying bricks real in described rowlock wall body both sides Band covers real lay bricks and bucket is laid bricks intersection area.
The ruggedized construction construction method of a kind of above-mentioned rowlock wall body, comprises the following steps:
The first step: at the construction field (site), first shows consideration for rowlock wall and uses mortar levelling maintenance at steel plate;
Second step: carry out perforate at angle steel, steel plate band, short steel plate, long steel plate strip and corresponding rowlock wall body position;
3rd step: angle steel penetrates wearing bolt, and reperfusion structure glue carries out the bonding of angle steel and rowlock wall body, to wearing bolt anchor Gu, a limb upper surface of angle steel and the floor bonding acted on rowlock wall body, same steel plate band reperfusion structure glue bond is also With to wearing bolt anchoring, another limb of angle steel docks with steel plate band, and joint uses structure glue to paste one block of short steel plate, and uses At angle steel and steel plate band to wearing bolt anchoring;
4th step: rowlock wall body uses the structure glue long steel plate strip of bonding and ground, makes long steel plate strip be pressed against steel plate band Lower end, prevents from being displaced outwardly, and long steel plate strip and ground anchor with chemical anchor bolts again;
5th step: after having reinforced, smears the steel beam column on rowlock wall body with mortar material and forms protective layer.
As preferably, described rowlock wall body and steel plate band, angle steel position of opening in correspondence with each other, rowlock wall body should be at brick Perforate at mortar mortar joint between block, position of opening is in the mortar mortar joint of dormancy brick and header intersection.
The reinforcing of rowlock wall body of the present invention includes the leveling of mortar at affixing steel plate and opening of maintenance, body of wall and steel plate Hole, the bonding of steel plate and body of wall, to wearing the anchoring of bolt, the rendering of steel plate and maintenance.The present invention is by using structure glue by steel Plate bonds with body of wall, and with to wearing bolt anchoring, makes steel plate and body of wall synergism, common bearing load, thus improve body of wall Bearing capacity, play consolidation effect.
The reinforcement means of the rowlock wall body of the present invention is not only suitable for the solid wall with or without collar tie beam, is also applied for rowlock wall Body.
Beneficial effects of the present invention: compared with the reinforcement means conventional with tradition, the reinforcing of the present invention not only dramatically increases The globality of body of wall and bearing capacity, and dry Job Operations, construct convenient, shortens the construction period, takies building hardly Area, does not affect the normal use of building in reinforcing process, and people need not resettlement and go out, to daily life order simultaneously Impact less.Meet the needs of social market development, meet the strategy of sustainable development.
Accompanying drawing explanation
Fig. 1 is the ruggedized construction schematic diagram of rowlock wall body of the present invention;
Fig. 2 is A-A profile in Fig. 1.
Detailed description of the invention
The present invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
As illustrated in fig. 1 and 2: the ruggedized construction of a kind of rowlock wall body, including rowlock wall body 1, angle steel 2, steel plate band 3, short Steel plate 5, long steel plate strip 6, to wearing bolt 4 and chemical anchor bolts 7;
The both sides metope of described rowlock wall body 1 is respectively equipped with the most vertical a plurality of steel plate band 3, the two of rowlock wall body 1 Side wall upper end is respectively equipped with the angle steel 2 of transverse horizontal;Described steel plate band 3 and angle steel 2 are all by structure glue and rowlock wall body 1 Bonding, and by anchoring wearing bolt 4;Described angle steel 2 one limb is concordant with rowlock wall body 1 upper surface so that upper load reaches On same plane, angle steel 2 and the common stress of rowlock wall body 1, another limb of angle steel 2 docks concordant with steel plate band 3 so that load passes Being handed to steel plate band 3, bond above angle steel 2 and steel plate band 3 joint short steel plate 5, and by anchoring wearing bolt 4;
The bottom surface of described rowlock wall body 1 uses structure glue bonding ground, is provided with anti-outside described steel plate band 3 lower end The long steel plate strip 6 that only steel plate band 3 is displaced outwardly, long steel plate strip 6 is anchored by chemical anchor bolts 7 with ground.
Described rowlock wall body 1 include three dormancies a pipeful of, five sleep bucket type rowlock wall bodies a pipeful of, complete.Described rowlock wall body 1 both sides exist Lay bricks in fact and bucket junction of laying bricks answers affixing steel plate band 3, i.e. steel plate band 3 to cover real lay bricks and bucket is laid bricks intersection area.
The ruggedized construction construction method of a kind of above-mentioned rowlock wall body, comprises the following steps:
The first step: at the construction field (site), first will use mortar levelling maintenance at rowlock wall body 1 sticking steel plate;
Second step: carry out in angle steel 2, steel plate band 3, short steel plate 5, long steel plate strip 6 and corresponding rowlock wall body 1 position Perforate;
3rd step: angle steel 2 penetrates wearing bolt 4, reperfusion structure glue carries out the bonding of angle steel 2 and rowlock wall body 1, to wearing spiral shell Bolt 4 anchors, a limb upper surface of angle steel 2 and the floor bonding acted on rowlock wall body 1, same steel plate band 3 reperfusion structure Glue bond with anchoring wearing bolt 4, another limb of angle steel 2 docks with steel plate band 3, and joint uses structure glue to paste one piece Short steel plate 5, and with anchoring wearing bolt 4 at angle steel 2 and steel plate band 3;
4th step: rowlock wall body 1 uses the structure glue long steel plate strip 6 of bonding and ground, makes long steel plate strip 6 be pressed against steel plate strip Carrying 3 lower end, prevent from being displaced outwardly, long steel plate strip 6 and ground anchor with chemical anchor bolts 7 again;
5th step: after having reinforced, smears the steel beam column on rowlock wall body 1 with mortar material and forms protective layer.
Described rowlock wall body 1 and steel plate band 3, angle steel 2 position of opening in correspondence with each other, rowlock wall body 1 should fragment of brick it Between mortar mortar joint at perforate, position of opening be dormancy brick with in the mortar mortar joint of header intersection.
Above in association with accompanying drawing, embodiments of the present invention are described in detail, but the present invention is not limited to described reality Execute mode.For those of ordinary skill in the art, in the range of the principle and technological thought of the present invention, these are implemented Mode carries out multiple change, revises, replaces and deformation still falls within protection scope of the present invention.

Claims (5)

1. the ruggedized construction of a rowlock wall body, it is characterised in that: include rowlock wall body, angle steel, steel plate band, short steel plate, length Steel plate strip, to wearing bolt and chemical anchor bolts;
The both sides metope of described rowlock wall body is respectively equipped with the most vertical a plurality of steel plate band, on the both sides metope of rowlock wall body End is respectively equipped with the angle steel of transverse horizontal;Described steel plate band and angle steel are all bondd with rowlock wall body by structure glue, and pass through To wearing bolt anchoring;Described angle steel one limb is concordant with rowlock wall body upper surface so that upper load reaches on same plane, angle steel Stress common with rowlock wall body, another limb of angle steel docks concordant with steel plate band so that load is transferred to steel plate band, angle steel with Bond above steel plate band joint short steel plate, and by wearing bolt anchoring;
The bottom surface of described rowlock wall body uses structure glue bonding ground, is provided with and prevents steel plate outside described steel plate strip band lower end The long steel plate strip that band is displaced outwardly, long steel plate strip is anchored by chemical anchor bolts with ground.
The ruggedized construction of a kind of rowlock wall body the most according to claim 1, it is characterised in that: described rowlock wall body includes three Sleep a pipeful of, five sleep bucket type rowlock wall bodies a pipeful of, complete.
The ruggedized construction of a kind of rowlock wall body the most according to claim 1, it is characterised in that: described rowlock wall body both sides exist Lay bricks in fact and bucket junction of laying bricks answers affixing steel plate band, i.e. steel plate band to cover real lay bricks and bucket is laid bricks intersection area.
4. according to the construction method of the ruggedized construction of a kind of rowlock wall body described in claim 1,2 or 3, it is characterised in that: bag Include following steps:
The first step: at the construction field (site), first shows consideration for rowlock wall and uses mortar levelling maintenance at steel plate;
Second step: carry out perforate at angle steel, steel plate band, short steel plate, long steel plate strip and corresponding rowlock wall body position;
3rd step: angle steel penetrates wearing bolt, and reperfusion structure glue carries out the bonding of angle steel and rowlock wall body, to wearing bolt anchoring, One limb upper surface of angle steel and the floor bonding acted on rowlock wall body, same steel plate band reperfusion structure glue bond with right Wearing bolt anchoring, another limb of angle steel docks with steel plate band, and joint uses structure glue to paste one block of short steel plate, and uses angle steel With at steel plate band to wearing bolt anchoring;
4th step: rowlock wall body uses the structure glue long steel plate strip of bonding and ground, makes long steel plate strip be pressed against steel plate strip band bottom End, prevents from being displaced outwardly, and long steel plate strip and ground anchor with chemical anchor bolts again;
5th step: after having reinforced, smears the steel beam column on rowlock wall body with mortar material and forms protective layer.
The construction method of the ruggedized construction of a kind of rowlock wall body the most according to claim 4, it is characterised in that: described empty bucket Body of wall and steel plate band, angle steel position of opening in correspondence with each other, rowlock wall body should perforate at mortar mortar joint between blocks are actually, open Hole site is in the mortar mortar joint of dormancy brick and header intersection.
CN201610627100.6A 2016-08-03 2016-08-03 A kind of ruggedized construction and its construction method of rowlock wall body Active CN106088657B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610627100.6A CN106088657B (en) 2016-08-03 2016-08-03 A kind of ruggedized construction and its construction method of rowlock wall body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610627100.6A CN106088657B (en) 2016-08-03 2016-08-03 A kind of ruggedized construction and its construction method of rowlock wall body

Publications (2)

Publication Number Publication Date
CN106088657A true CN106088657A (en) 2016-11-09
CN106088657B CN106088657B (en) 2019-03-29

Family

ID=57453448

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610627100.6A Active CN106088657B (en) 2016-08-03 2016-08-03 A kind of ruggedized construction and its construction method of rowlock wall body

Country Status (1)

Country Link
CN (1) CN106088657B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107473656A (en) * 2017-08-08 2017-12-15 合肥工业大学 A kind of foaming concrete lightweight material and the traditional rowlock wall body construction method of filling
CN107524251A (en) * 2017-09-22 2017-12-29 东南大学 Prestress steel strip masonry faced wall
CN109914849A (en) * 2019-04-02 2019-06-21 郑州航空工业管理学院 A kind of FRP wall reinforcement device and reinforcement means

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4563852A (en) * 1984-12-21 1986-01-14 Irving Achtenberg Method of reinforcing concrete block foundation walls
US5896716A (en) * 1996-07-08 1999-04-27 Jalla; Maharaj K. Joist splice shoe
CN201598846U (en) * 2010-03-10 2010-10-06 中国建筑一局(集团)有限公司 Antique building external wall prestressing steel band reinforcement device
CN101906882A (en) * 2010-07-06 2010-12-08 华南理工大学 Method for carrying out earthquake-resistance and strengthening on traditional masonry structure by using steel parts
CN102561717A (en) * 2011-12-31 2012-07-11 北京筑福建设工程有限责任公司 Method for reinforcing brick-concrete structure by utilizing angle steel frame
CN102635245A (en) * 2012-05-14 2012-08-15 武汉大学 Reinforcing body of earthquake resistant walls and reinforcing method of reinforcing body
CN203808545U (en) * 2014-04-16 2014-09-03 上海其军加固工程有限公司 Wall reinforced through bonding steel
CN205894732U (en) * 2016-08-03 2017-01-18 连云港市房屋安全鉴定管理中心 Reinforced structure of rowlock wall body

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4563852A (en) * 1984-12-21 1986-01-14 Irving Achtenberg Method of reinforcing concrete block foundation walls
US5896716A (en) * 1996-07-08 1999-04-27 Jalla; Maharaj K. Joist splice shoe
CN201598846U (en) * 2010-03-10 2010-10-06 中国建筑一局(集团)有限公司 Antique building external wall prestressing steel band reinforcement device
CN101906882A (en) * 2010-07-06 2010-12-08 华南理工大学 Method for carrying out earthquake-resistance and strengthening on traditional masonry structure by using steel parts
CN102561717A (en) * 2011-12-31 2012-07-11 北京筑福建设工程有限责任公司 Method for reinforcing brick-concrete structure by utilizing angle steel frame
CN102635245A (en) * 2012-05-14 2012-08-15 武汉大学 Reinforcing body of earthquake resistant walls and reinforcing method of reinforcing body
CN203808545U (en) * 2014-04-16 2014-09-03 上海其军加固工程有限公司 Wall reinforced through bonding steel
CN205894732U (en) * 2016-08-03 2017-01-18 连云港市房屋安全鉴定管理中心 Reinforced structure of rowlock wall body

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107473656A (en) * 2017-08-08 2017-12-15 合肥工业大学 A kind of foaming concrete lightweight material and the traditional rowlock wall body construction method of filling
CN107473656B (en) * 2017-08-08 2019-09-13 合肥工业大学 A kind of foaming concrete lightweight material and filling traditional empty wall body construction method
CN107524251A (en) * 2017-09-22 2017-12-29 东南大学 Prestress steel strip masonry faced wall
CN107524251B (en) * 2017-09-22 2019-08-20 东南大学 Prestress steel strip masonry faced wall
CN109914849A (en) * 2019-04-02 2019-06-21 郑州航空工业管理学院 A kind of FRP wall reinforcement device and reinforcement means

Also Published As

Publication number Publication date
CN106088657B (en) 2019-03-29

Similar Documents

Publication Publication Date Title
CN106013432B (en) A kind of high ductility prefabricated integral frame interior joint connection structure and construction method
CN102003080B (en) Anti-seismic reinforcing structure and method of old brickwork building
CN106436893A (en) Fully-prefabricated structure and construction method thereof
CN106088657A (en) The ruggedized construction of a kind of rowlock wall body and construction method thereof
CN106801517A (en) A kind of schoolhouse surface consolidation of Prefabricated porous plate brick mixed structure strengthens method
CN108775084A (en) Steel-concrete combines precast beam and prefabricated post connection structure and construction method
CN103741958A (en) Method for reinforcing existing building by peripheral assembled substructure
CN208534081U (en) A kind of reconstruction structure of old building constructional column
CN205894732U (en) Reinforced structure of rowlock wall body
CN208152311U (en) A kind of two-sided folded type steel shear wall
CN109653404A (en) First fill the construction method and structural system of prefabricated big plate filled wall concrete structure
CN108678213A (en) A kind of reinforcement type rowlock wall body and its construction method
CN205501843U (en) Consolidate rigid framed arch bridge
CN201865365U (en) Anti-seismic reinforcing structure for old brickwork buildings
CN101487268A (en) Concrete basement structure with/without bonding prestress and its construction method
CN107013040A (en) The construction method of floor is poured after a kind of sleeve built-in type
CN107090908A (en) A kind of new vertical prefabricated components joint connecting method
CN112064824A (en) Combined-connection prefabricated shear wall system
CN206942186U (en) Embedded prestressing force assembling frame reinforces the structure of former framework
CN111058368A (en) Corrugated steel reinforcing arch utilizing high-strength grouting material and building method thereof
CN207003673U (en) A kind of connecting node of beam and wallboard
CN207017514U (en) A kind of integral light-weight vacuum laminated floor slab
CN206189891U (en) Existing building reinforcement is from load -bearing and insulating integration system
CN110067401A (en) A kind of existing masonry structure is reinforced using prefabricated board wall and its construction method
CN206503378U (en) Newly-increased outrigger constructing structure

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant