CN106958247A - Basement annular brace support system - Google Patents

Basement annular brace support system Download PDF

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Publication number
CN106958247A
CN106958247A CN201710189850.4A CN201710189850A CN106958247A CN 106958247 A CN106958247 A CN 106958247A CN 201710189850 A CN201710189850 A CN 201710189850A CN 106958247 A CN106958247 A CN 106958247A
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China
Prior art keywords
support
layer
enclosure
annular
template
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CN201710189850.4A
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Chinese (zh)
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CN106958247B (en
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朱奎
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朱奎
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Priority to CN201510284234.8A priority Critical patent/CN105019553B/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/10Restraining of underground water by lowering level of ground water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/12Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/16Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • E02D29/05Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them at least part of the cross-section being constructed in an open excavation or from the ground surface, e.g. assembled in a trench
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/02Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
    • E02D31/04Watertight packings for use under hydraulic pressure
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2200/00Geometrical or physical properties
    • E02D2200/16Shapes
    • E02D2200/1607Shapes round, e.g. circle
    • E02D2200/1621Shapes round, e.g. circle made from multiple elements
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0007Production methods using a mold
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0026Metals
    • E02D2300/0029Steel; Iron

Abstract

The invention discloses a kind of basement annular brace support system, it is characterized in that setting twice support system, first of support is arranged at the top of basement, second support is arranged in the middle part of basement, first of support annular brace makes truss structure, and second support system uses beam type annular brace;Four corners position building enclosure and annular brace top support structure make concrete slab, one layer of annular outer support is from being 1.5~3m with a distance from enclosure wall, branch is set to shore between one layer of annular outer support and enclosure wall, concrete truss web member is set between one layer of annular outer support and one layer of circular inner support, and support column is provided below in one layer of circular inner support and one layer of annular outer support.

Description

Basement annular brace support system
Technical field
The present invention relates to a kind of annular brace support system, more particularly to basement annular brace support system.
Background technology
In basement support system, the features such as inner support supporting construction has safe and reliable, economical rationality, in foundation ditch work It is used widely in journey.But construction of the conventional inner support set to support mode to basement earth excavation and underground structure is made Into great inconvenience, the consequence such as construction period extension, less economical is produced.The conventional branch to supportting mode is substituted using annular brace Protection structure system, can obtain higher economic benefit.But annular brace especially multiple tracks branch when basement excavates deeper During support, lateral pressure suffered by first of annular brace would generally exceed concrete compressive ultimate strength, and position occurs in annular brace Move past big, the bad phenomenon such as annular brace concrete generation cracking.
The content of the invention
The present invention is to provide a kind of basement annular brace support system, solves problem of the prior art.
Therefore, the present invention sets twice support system, first of support is arranged at the top of basement, and second support is set In the middle part of basement, due to be supported on for first basement be excavated to bottom absolute altitude position stress can be very big, according to first Annular brace is made truss structure by the loading characteristic supportted in construction, and this rigidity of structure is larger, and non-deformability is strong, and The stress of second support system can be significantly reduced, so just simple use beam type annular brace.It can be answered in view of corner stress Power is concentrated, therefore four corners position building enclosure and annular brace top support structure are made into concrete slab, to strengthen corner rigidity Resistance to deformation.
Enclosure wall width is 60~80mm, and depth is 2~3 times of basement cutting depth, the concrete that enclosure wall is used For more than C30, one layer of annular outer support is from being 1.5~3m with a distance from enclosure wall, and one layer of annular outer support width is 30cm, height For 40~50cm, from one layer annular outer support distance of one layer of circular inner support is 1.2~1.6m, and one layer of annular outer support is with going along with sb. to guard him Branch is set to shore between wall, branch shores width for 30cm, is highly 40~50cm, one layer of circular inner support width is 30cm, high Spend for 40~50cm, setting concrete truss web member, concrete truss between one layer of annular outer support and one layer of circular inner support Web member width is 20cm, is highly 40~50cm, and support column is provided below in one layer of circular inner support and one layer of annular outer support, props up Dagger uses coagulation post or steel column, and support column, which is tried one's best, to be arranged on above engineering pile, and otherwise temporary support is provided below in support column Stake.
Two layers of annular brace and enclosure wall top support structure are shored and are combined using concrete slab and branch, basement long side direction Concrete slab is set in 1/4 length range and the length range of short side direction 1/3, and basement medium position sets branch to shore, two layers Branch, which is shored, shores that projected position is identical with one layer of branch, the support column of two layers of annular brace and the support column phase of one layer of annular outer support Together.
One layer of branch care-supporting is stretched into inside enclosure wall, is rigidly connected with enclosure wall formation, two layers of branch care-supporting and enclosure wall outside Reserved steel bar welded, articulated structure is formed, the characteristics of to adapt to building enclosure.According to test situation, one layer of branch care-supporting After being rigidly connected with enclosure wall formation, annular brace deformation is uniform and deformation is relatively small, and enclosure wall deformation is relatively large;Two Layer branch care-supporting is relatively large with after enclosure wall formation articulated structure, deforming, but enclosure wall deformation is relatively small.
Construction procedure includes:
(1) enclosure wall is constructed.
Enclosure wall will not only carry out bank protection, also prevent infiltration, and enclosure wall doubles as outer wall of basement.Enclosure wall construction is used Empty stomach template, empty stomach template sinks to stratum by the vertical exciting force of the vertical generation of reciprocating vibration of vibration hammer, immediately into empty stomach Slurries are filled, when vibration dip mould is lifted, slurries out of the injection of template lower end slotted eye, have first sunk to stratum under gravity Template sinks to the guide plate of template after turning into, the effect that plate plate interlocks is presented in two pieces of templates, it is ensured that each veneer body is flat at one Wall is closely integrated into face.
Construction technology includes:
1) preformed groove is excavated;
2) prebored hole;
In the junction prebored hole of two pieces of templates, a diameter of 90~110cm of prebored hole;
3) vibration dip mould;
Start vibration hammer, first piece of template is sunk in stratum, projected depth is reached, then by second piece of template edge construction axle Line is close side by side with first piece of template first piece of front side, using first piece of template as guide plate, sinks to stratum and reaches projected depth;
4) first piece of template of perfusion lifting;
Slurry is irrigated into first piece of template, is then irrigated in lifting, until extracting ground, slurry is stayed in slotted eye, After perfusion lifting terminates, slurry is kept to reach wall top design altitude;
5) template is sunk to again;
Using second piece of template as guide plate, sink to stratum and reach projected depth, Reperfu- sion lifts second piece of template;More than pressing Program circulation construction, you can complete enclosure wall.
Current traditional handicraft be using fluting of cutting the earth, mud off, scarfing cinder, to pour underwater concrete, processing seam serial Process, is easy to collapse hole when being slotted in permeable stratum, enclosure wall does not often reach thickness and disconnected wall phenomenon occurs.And the present invention with Powerful vertical exciting force, soil layer is sunk to by empty stomach template, and template and slurries serve retaining wall and acted on, in work progress not only not Soil stress rationally release, and during vibration dip mould, by its soil at both sides dense extrusion, improve impermeability.Due to this Invention is in original soil body by template squeezing action in lower completion.And side carries mould marginal not slurry in template procedure is promoted, slurries are from mould In plate bottom production note people's groove, column pressure is starched in addition and is more than soil body lateral pressure, therefore is not in contracting wall and wall phenomenon of collapsing.
(2) support column is constructed.
Such as without engineering pile below support column, support column is inserted into temporary support pile after temporary support pile of first constructing.If there is work Journey stake, directly inserts temporary support pile by support column.
(3) one layer of annular outer support, one layer of circular inner support, concrete truss web member, one layer of branch is done to shore.
(4) cut the earth to two layers of annular brace bottom absolute altitude position, do two layers of annular brace, enclosure wall is in two layers of support zone office Concrete is peeled off in portion, and reserved steel bar is welded outside exposed cage bar, then casting concrete plate, finally do two layers of branch and shore.
(5) cut the earth to 10cm below the absolute altitude of basement bottom board bottom, first do plain concrete cushion layer, then pour basement bottom board and mix Solidifying soil.
It is right for the big position of water yield using the stifled technical scheme being combined is dredged when pouring basement bottom board construction It is small in water yield, the small position of water pressure using the method blocked by force, pour smash plain concrete cushion layer when, use in subrange The casting and compacting of concrete of accelerator is mixed, concrete is solidification in 1~2min.When water yield is big, led with plastic flexible pipe Water is poured whne cushion cap base plate and smash and re-closed catch pit when reaching 80% intensity into catch pit.The closure of catch pit is by following Carry out:Water is concentrated in steel pipe, diameter of steel tube is 50mm, steel pipe inner wall has screw thread;Water pipe is closed with screw head precession steel pipe, Pour the concrete in the reserved hole of base plate.The inwall in reserved hole sets groove for sealing, and rear pouring concrete mixes U EA swelling agents, really Protect the good combination of new-old concrete.
(6) carry out explosion is shored to two layers of annular brace, concrete slab, two layers of branch, explosion removes support column after finishing.
Using static blasting, static blasting uses the expansive force of expanding material more than 30MPa, static blasting reserving hole A diameter of 30~40mm, reserving hole spacing controls for 0.3~0.4m, and end reserving hole indwelling position is away from structure floor Hole area is no more than area of section 10% on 150mm~200mm, member cross-sections;Reinforced concrete member in reserving hole Cage bar or stirrup cut off, it is ensured that the binding force of reinforcing bar does not influence demolition effect.
(7) two layers of basement roof are poured.
(8) carry out explosion is shored to one layer of annular outer support, one layer of circular inner support, concrete truss web member, one layer of branch.
(9) one layer of basement roof is poured.
Brief description of the drawings
Fig. 1 is one layer of basement annular brace supporting construction schematic diagram, and Fig. 2 is two layers of basement annular brace supporting construction Schematic diagram.
In each accompanying drawing:1st, enclosure wall, 2, one layer of branch shore, 3, one layer of annular outer support, 4, one layer of circular inner support, 5, mixed Solidifying soil truss web, 6, support column, 7, two layers of annular brace, 8, concrete slab, 9, two layers of branch shore.
Embodiment
Certain engineering is 18 layers of building, is frame cylinder shear wall structure, basement cutting depth is 7.2m, and basement is irregular Shape, engineering pile is cast-in-situ bored pile, and cast-in-situ bored pile depth is 42m.
The present embodiment sets twice support system, and first of support is arranged at the top of basement, and second support is arranged on In the middle part of basement, first of support annular brace makes truss structure, and second support system uses beam type annular brace.Four Angular position building enclosure and annular brace top support structure make concrete slab 8.
The width of enclosure wall 1 be 70mm, depth be 2.5 times of basement cutting depth, the concrete that enclosure wall 1 is used for C30, one layer of annular outer support 3 is from being 2m with a distance from enclosure wall 1, and one layer of annular width of outer support 3 is 30cm, is highly 45cm, It is 1.4m with a distance from from one layer annular outer support 3 of one layer of circular inner support 4, branch is set between one layer of annular outer support 3 and enclosure wall 1 Shore, branch shores width for 30cm, is highly 45cm, one layer of width of circular inner support 4 is 30cm, is highly 45cm, one layer of ring Concrete truss web member 5 is set between shape outer support 3 and one layer of circular inner support 4, and the width of concrete truss web member 5 is 20cm, Highly it is 45cm, support column 6 is provided below in one layer of circular inner support 4 and one layer of annular outer support 3, and support column 6 uses coagulation post Or steel column, support column 6 as far as possible be arranged on above engineering pile, otherwise temporary support pile is provided below in support column 6.
Two layers of annular brace 7 and the top support structure of enclosure wall 1 are shored and are combined using concrete slab 8 and branch, the long side of basement Concrete slab is set in the length range of direction 1/4 and the length range of short side direction 1/3, and basement medium position sets branch to shore, Two layers of branch shore 9 and shore that 2 projected positions are identical with one layer of branch, the support column 6 of two layers of annular brace 7 and one layer of annular outer support 3 Support column 6 it is identical.
One layer of branch care-supporting is stretched into inside enclosure wall 1, is rigidly connected with the formation of enclosure wall 1, outside two layers of branch care-supporting and enclosure wall 1 The reserved steel bar in face is welded, and forms articulated structure.
Construction procedure includes:
(1) enclosure wall 1 is constructed.
The construction of enclosure wall 1 uses empty stomach template, the vertical exciting that empty stomach template passes through the vertical generation of reciprocating vibration of vibration hammer Power sinks to stratum, fills slurries into empty stomach immediately, when vibration dip mould is lifted, and slurries are noted from template lower end under gravity Enter in slotted eye, first sunk to after the template on stratum turns into and sunk to the guide plate of template, the effect that plate plate interlocks is presented in two pieces of templates, It ensure that each veneer body is closely integrated into wall in a plane.
Construction technology includes:
1) preformed groove is excavated;
2) prebored hole;
In the junction prebored hole of two pieces of templates, a diameter of 100cm of prebored hole;
3) vibration dip mould;
Start vibration hammer, first piece of template is sunk in stratum, projected depth is reached, then by second piece of template edge construction axle Line is close side by side with first piece of template first piece of front side, using first piece of template as guide plate, sinks to stratum and reaches projected depth;
4) first piece of template of perfusion lifting;
Slurry is irrigated into first piece of template, is then irrigated in lifting, until extracting ground, slurry is stayed in slotted eye, After perfusion lifting terminates, slurry is kept to reach wall top design altitude;
5) template is sunk to again;
Using second piece of template as guide plate, sink to stratum and reach projected depth, Reperfu- sion lifts second piece of template;More than pressing Program circulation construction, you can complete enclosure wall 1.
(2) support column 6 is constructed.
Such as without engineering pile, temporary support pile is inserted after temporary support pile of first constructing below by support column 6 for support column 6.If having Engineering pile, directly inserts temporary support pile by support column 6.
(3) one layer of annular outer support 3, one layer of circular inner support 4, concrete truss web member 5, one layer of branch are done and shores 2.
(4) cut the earth to two layers of bottom absolute altitude position of annular brace 7, do two layers of annular brace 7, enclosure wall 1 is in two layers of supporting part Position localized delamination concrete, reserved steel bar is welded outside exposed cage bar, then casting concrete plate 8, finally do two layers of support top Support 9.
(5) cut the earth to 10cm below the absolute altitude of basement bottom board bottom, first do plain concrete cushion layer, then pour basement bottom board and mix Solidifying soil.
It is right for the big position of water yield using the stifled technical scheme being combined is dredged when pouring basement bottom board construction It is small in water yield, the small position of water pressure using the method blocked by force, pour smash plain concrete cushion layer when, use in subrange The casting and compacting of concrete of accelerator is mixed, concrete is solidification in 1~2min.When water yield is big, led with plastic flexible pipe Water is poured whne cushion cap base plate and smash and re-closed catch pit when reaching 80% intensity into catch pit.The closure of catch pit is by following Carry out:Water is concentrated in steel pipe, diameter of steel tube is 50mm, steel pipe inner wall has screw thread;Water pipe is closed with screw head precession steel pipe, Pour the concrete in the reserved hole of base plate.The inwall in reserved hole sets groove for sealing, and rear pouring concrete mixes UEA swelling agents, really Protect the good combination of new-old concrete.
(6) 9 carry out explosions are shored to two layers of annular brace 7, concrete slab 8, two layers of branch, explosion removes support column after finishing 6。
Using static blasting, static blasting uses the expansive force of expanding material for 35MPa, and static blasting reserving hole is straight Footpath is 35mm, and reserving hole spacing controls for 0.3~0.4m, and end reserving hole indwelling position is away from structure floor 200mm, component Hole area is no more than area of section 10% on cross section;The cage bar or stirrup of reinforced concrete member are cut in reserving hole It is disconnected, it is ensured that the binding force of reinforcing bar does not influence demolition effect.
(7) two layers of basement roof are poured.
(8) 2 progress are shored to one layer of annular outer support 3, one layer of circular inner support 4, concrete truss web member 5, one layer of branch Explosion.
(9) one layer of basement roof is poured.
Analyzed by computer simulation emulation, this structure is contrasted with other support systems.The first situation is to adopt With the present embodiment, second of situation is uses inner support merely, and the third situation uses annular brace for one layer two layers.Table 1 is Find that the supporting maximum horizontal displacement of the present embodiment is far smaller than second in different support system displacements and mechanical property contrast, table The situation of kind and the third situation, the 38.6% of respectively second situation, it is the 57.9% of second of situation.The present embodiment is most Big axle power is substantially reduced, and the 59.6% of respectively second situation, it is the 79.9% of second of situation.The present embodiment it is maximum curved Square is substantially reduced, and the 62.8% of respectively second situation, it is the 79.0% of second of situation.
The different support system displacements of table 1 and mechanical property contrast
Through Site Detection basement Stability Analysis of Structures in work progress, supporting displacement is no more than 11mm, support beam structure Stable, phenomenon without exception occurs.

Claims (2)

1. a kind of basement annular brace support system, it is characterized in that setting twice support system, first of support is arranged on ground Lower ceiling portion, second support is arranged in the middle part of basement, and first of support annular brace makes truss structure, second branch Support body system uses beam type annular brace;Four corners position building enclosure and annular brace top support structure make concrete slab;
Enclosure wall width is 60~80mm, and depth is 2~3 times of basement cutting depth, and the concrete that enclosure wall is used is C30 More than, one layer of annular outer support is from being 1.5~3m with a distance from enclosure wall, and one layer of annular outer support width is 30cm, is highly 40 ~50cm, from one layer annular outer support distance of one layer of circular inner support is 1.2~1.6m, one layer of annular outer support and enclosure wall it Between set branch to shore, branch shores width for 30cm, is highly 40~50cm, and one layer of circular inner support width is 30cm, is highly 40~50cm, sets concrete truss web member, concrete truss web member between one layer of annular outer support and one layer of circular inner support Width is 20cm, is highly 40~50cm, and support column, support column is provided below in one layer of circular inner support and one layer of annular outer support Using coagulation post or steel column, support column, which is tried one's best, to be arranged on above engineering pile, and otherwise temporary support pile is provided below in support column;
Two layers of annular brace and enclosure wall top support structure are shored and are combined using concrete slab and branch, basement long side direction 1/4 Concrete slab is set in length range and the length range of short side direction 1/3, and basement medium position sets branch to shore, two layers of support top Support shores that projected position is identical with one layer of branch, and the support column of two layers of annular brace and the support column of one layer of annular outer support are identical;
Enclosure wall will not only carry out bank protection, also prevent infiltration, and enclosure wall doubles as outer wall of basement;
Enclosure wall construction technology includes:
1) preformed groove is excavated;
2) prebored hole;
In the junction prebored hole of two pieces of templates, a diameter of 90~110cm of prebored hole;
3) vibration dip mould;
Start vibration hammer, first piece of template is sunk in stratum, projected depth is reached, then second piece of template exists along construction axis First piece of front side is close side by side with first piece of template, using first piece of template as guide plate, sinks to stratum and reaches projected depth;
4) first piece of template of perfusion lifting;
Slurry is irrigated into first piece of template, is then irrigated in lifting, until extracting ground, slurry is stayed in slotted eye, is irrigated After lifting terminates, slurry is kept to reach wall top design altitude;
5) template is sunk to again;
Using second piece of template as guide plate, sink to stratum and reach projected depth, Reperfu- sion lifts second piece of template;By procedure above Circulation construction, you can complete enclosure wall.
2. annular brace support system according to claim 1, it is characterized in that one layer of branch care-supporting is stretched into inside enclosure wall, with Enclosure wall formation is rigidly connected, and two layers of branch care-supporting are welded with the reserved steel bar outside enclosure wall, forms articulated structure.
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