CN103967022A - Support unit for long sides of strip rectangular foundation ditch - Google Patents

Support unit for long sides of strip rectangular foundation ditch Download PDF

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Publication number
CN103967022A
CN103967022A CN201410233743.3A CN201410233743A CN103967022A CN 103967022 A CN103967022 A CN 103967022A CN 201410233743 A CN201410233743 A CN 201410233743A CN 103967022 A CN103967022 A CN 103967022A
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CN
China
Prior art keywords
shaped steel
web member
steel
angle
angle brace
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Pending
Application number
CN201410233743.3A
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Chinese (zh)
Inventor
王承存
王志贵
刘正斌
王飞
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Deqing Xin De Machinery Co Ltd
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Deqing Xin De Machinery Co Ltd
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
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Application filed by Deqing Xin De Machinery Co Ltd filed Critical Deqing Xin De Machinery Co Ltd
Priority to CN201410233743.3A priority Critical patent/CN103967022A/en
Publication of CN103967022A publication Critical patent/CN103967022A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a support unit for long sides of a strip rectangular foundation ditch. The long sides of the foundation ditch are provided with two or more fish-bellied beam devices; an opposite support is arranged between every two adjacent fish-bellied beam devices between the two longs to support the foundation ditch together; the opposite support generates prestress by adjusting a lifting jack; and the fish-bellied beam devices generate prestress by adjusting the tightness of a stranded wire. The support structure integrally occupies small space, is convenient for excavating the foundation ditch, and enhances the efficiency; and meanwhile, most components of the support structure are standard-sized profiles which are connected through bolt parts, and thus, are very convenient to install and demount and have high reutilization rate, thereby integrally lowering the support cost of the foundation ditch.

Description

A kind of suspension device for the long limit of elongated rectangular shape foundation ditch
Technical field
The invention belongs to field of civil engineering, be specifically related to the prestressing force supporting and protection structure of foundation ditch.
Background technology
The mode that existing pattern foundation pit supporting structure mode mostly adopts is that the surrounding at foundation ditch arranges reinforced concrete fortifield village purlin, in enclosing purlin, week is arranged netted steel pipe support again, when it is not enough, steel pipe consumption is large, install, remove trouble, and it is large to take up space, and is unfavorable for soil excavation in foundation ditch, can not to foundation pit side-wall, apply prestressing force well, support strength is low, conventionally can only increase support force by increasing the density of steel pipe layout; And during different pattern foundation pit supporting structure, need use the steel pipe of different size, steel pipe repeat usage is low, causes the costly of pattern foundation pit supporting structure.
Summary of the invention
Technical problem to be solved by this invention is: the deficiency existing for prior art, and a kind of installation is provided, removes conveniently, occupy foundation ditch space little, the suspension device on the long limit of foundation ditch that supporting intensity is high and the supporting section bar rate of recovery is high.
For realizing the present invention's object, be achieved by the following technical solutions: a kind of suspension device for the long limit of elongated rectangular shape foundation ditch, include the cement mixing pile of squeezing into along foundation ditch periphery downwards, the capping beam of reinforced concrete structure is built on cement mixing pile top, in capping beam, be connected with in week and enclose purlin shaped steel, enclose purlin shaped steel and be fixedly connected with capping beam by rebar connector.
Described rebar connector includes L shaped reinforcing bar, the minor face of L shaped reinforcing bar and the reinforcing bar in capping beam are welded and fixed, end, the long limit coaxial welding of L shaped reinforcing bar has the female reinforcing bar connector that can attachment screw of tool, thereby is connected with reinforcing bar connector and will encloses purlin shaped steel and capping beam is fixed through the screw that encloses purlin shaped steel; The minor face of L shaped reinforcing bar and the reinforcing bar in capping beam weld and are cemented in the concrete of capping beam, and bonding strength is high to be not easy.
On the long limit of foundation ditch, be provided with two or more fish belly sill devices, fish belly sill device includes 2 the second angle brace seats, 5 web member supports between two the second angle brace seats, and be fixed between two the second angle brace seats and to each web member support and apply prestressed steel strand.
The second described angle brace seat is welded and forms successively by three sections of H shaped steel, and the web of three sections of H shaped steel is in the same plane, and three sections of H shaped steel surround an isosceles right triangle; The H shaped steel i that is positioned at hypotenuse is welded with a H shaped steel h in 1/3 position on the edge of a wing outwardly, and the both ends of H shaped steel h and H shaped steel i are all welded with junction plate; H shaped steel i is positioned at H shaped steel h mono-side and on the edge of a wing, offers the connecting hole that 2 group of two row four is listed as outwardly, and the distance of horizontal two adjacent connecting holes is a, and the distance of longitudinal two adjacent connecting holes is 2a; H shaped steel i is positioned at H shaped steel h opposite side and on the edge of a wing, offers one group of two row, 11 row and one group of two connecting hole that row six is listed as outwardly; Between web inside H shaped steel i and the edge of a wing, be welded with a plurality of reinforcing gussets, reinforce the position that gusset is positioned at H shaped steel h two ends, and the position between two adjacent groups connecting hole; The H shaped steel j end that is positioned at right-angle side is welded with junction plate, and the H shaped steel j edge of a wing outwardly offers the connecting hole of six group of two row's two row; The end of H shaped steel k and the edge of a wing vertical welding of H shaped steel j next-door neighbour end that are positioned at another right-angle side, the other end of the k of H shaped steel and H shaped steel i are away from one end welding of H shaped steel h; The H shaped steel k edge of a wing outwardly offers the connecting hole of three group of two row's two row; H shaped steel k is welded with a guide plate passing for steel strand near the end position of H shaped steel i, and H shaped steel i is welded with a steel strand fixed head near one end of H shaped steel k; Between H shaped steel i, H shaped steel j and H shaped steel k, be welded with a junction steel plate, the position that junction steel plate is positioned at the second angle brace seat middle part is provided with two steel strand anchorages; Described steel strand anchorage applies pulling force to steel strand, makes each web member support produce prestressing force to the cement mixing pile metope of foundation pit side-wall, guarantees that body of wall does not firmly tilt or collapses.Described steel strand end is divided into two strands through after guide plate, and one is strained by ground tackle, and another strand is fixed on steel strand fixed head after ground tackle tension.
Described web member support includes lower-cord beam, with lower-cord beam web member connected vertically, be connected the oblique fulcrum bar of web member and lower-cord beam, also comprise the extension rod with the coaxial adjustment web member length being connected of web member, and the steel strand positioning head that is connected to extension rod end; Each lower-cord beam end connects successively, and the lower-cord beam that is positioned at outermost end is connected with the second angle brace seat end; Described extension rod can be adjusted the effective length of web member as required, thereby makes steel strand have the radian needing, and the corner dimension between steel strand and web member is suitable.
Described each the second angle brace seat is fixedly connected with capping beam by rebar connector with lower-cord beam; The below of described each web member is also supported with angle-table bracket, angle-table bracket and the fixing welding of H shaped steel being inserted in cement mixing pile; Described steel strand coordinate pulling force that web member support produces on horizontal plane, and angle-table bracket can not produce web member support to teetertotter or be loosening.
In 5 described web member supports, be positioned at middle web member support and there is the longest web member and extension rod, be positioned at outermost web member support and there is the shortest web member and extension rod.
Described steel strand are successively on the steel strand positioning head of each web member bracket end, and the two ends of steel strand are passed the guide plate on the second angle brace seat and are fixed on steel strand fixed head and steel strand anchorage.
Described steel strand form symmetrical six parts between two the second angle brace seats and 5 web member supports, from middle, toward both sides, be followed successively by symmetrical line a, line b and line c, between line a and extension rod, form the angle of 82 degree, between line b and extension rod, form the angle of 67 degree, between line c and extension rod, form the angle of 54 degree; Described steel strand coordinate web member support to be set to above-mentioned angle, have guaranteed enough prestressing force on the one hand, make on the other hand web member support integral body occupy less space, are beneficial to the excavation of excavator.
Two the second angle brace seats and 5 web member support supported underneath have and the crossbeam that encloses purlin shaped steel and be arranged in parallel, and described crossbeam is connected on cement mixing pile; Between the extension rod of three web member supports at middle part, be also connected with reinforcement; The extension rod that sets up both sides after steel strand positioning head due to steel strand can be crooked in opposite directions, and described reinforcement makes extension rod not produce deformation, keeps lastingly stable support force.
Between two long limits of foundation ditch, be provided with at least one group to support arrangement, to support arrangement, between two adjacent groups fish belly sill device, every group includes two Eight characters supports and is connected to two one group of struts between Eight characters support support arrangement.
Two groups of struts that described Eight characters support includes two the second angle brace seats, a gusseted seat and connects two the second angle brace seats and gusseted seat; Two described the second angle brace seats are bolted the enclosing between purlin shaped steel of installation site, and the second angle brace seat is connected with capping beam by rebar connector; Two described the second angle brace seats are the members of two the fish belly sill devices in the left and right sides simultaneously, make the second angle brace seat syndeton of fish belly sill device end of both sides more firm to support arrangement, guarantee that steel strand can apply enough large prestressing force.
Described gusseted seat is isosceles right triangle, each right-angle side of gusseted seat is connected with respectively three struts, three strut other ends are connected with a reinforcement H shaped steel, the position of corresponding three struts of reinforcement H shaped steel opposite side is connected with three and regulates H shaped steel, regulates the H shaped steel other end to be connected with the H shaped steel j of the second angle brace seat right-angle side; Between three struts of every group, be connected with three and connect cover plate; Described gusseted seat right angle vertex position is connected with one perpendicular to the strut that encloses purlin shaped steel, and the strut other end connects a jack, and jack is connected with the purlin shaped steel that encloses between two the second angle brace seats.
Between the gusseted seat of both sides Eight characters support, by four struts, connect; Four strut supported underneath have the crossbeam vertical with strut, and crossbeam two ends are connected to two cement mixing pile tops, between two cement mixing piles, are connected with bridging.
Compared with prior art, the invention has the beneficial effects as follows: by the long leg at foundation ditch, divide two or more fish belly sill devices are set, and the position between two adjacent fish belly sill devices arranges support between two long limits, jointly foundation ditch is played to support action, described produces prestressing force to support by adjusting jack, and described fish belly sill device produces prestressing force by adjusting the elasticity of steel strand.The space that this kind of supporting and protection structure takies is on the whole little, is convenient to the excavation of foundation ditch, raises the efficiency, meanwhile, the member of supporting and protection structure is mostly standard-sized section bar, by bolt part, connects, install, remove all very convenient, repeatedly recycling rate of waterused is high, has reduced on the whole the cost of pattern foundation pit supporting structure.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the syndeton schematic diagram that encloses purlin shaped steel and capping beam.
Fig. 3 is the structural representation of rebar connector.
Fig. 4 is arranged on the structural representation of the fish belly sill device on the long limit of foundation ditch.
Fig. 5 is the structural representation of the second angle brace seat.
Fig. 6 is the structural representation of web member support.
Fig. 7 is the mounting structure schematic diagram of web member support.
Fig. 8 is arranged on the structural representation to support arrangement between the long limit of foundation ditch two.
Fig. 9 is the structural representation of Eight characters support.
Figure 10 is the mounting structure schematic diagram to support arrangement lower crossbeam.
The specific embodiment
With reference to the accompanying drawings the specific embodiment of the present invention is made a detailed explanation below.
According to shown in Fig. 1 to Figure 10, a kind of suspension device for the long limit of elongated rectangular shape foundation ditch described in the present embodiment, include the cement mixing pile 40 of squeezing into along foundation ditch periphery downwards, the capping beam of reinforced concrete structure is built on cement mixing pile top, in capping beam, be connected with in week and enclose purlin shaped steel 10, enclose purlin shaped steel and be fixedly connected with capping beam by rebar connector 70.
Described rebar connector includes L shaped reinforcing bar 701, the minor face of L shaped reinforcing bar and the reinforcing bar in capping beam are welded and fixed, end, the long limit coaxial welding of L shaped reinforcing bar has the female reinforcing bar connector 702 that can attachment screw of tool, thereby is connected with reinforcing bar connector and will encloses purlin shaped steel and capping beam is fixed through the screw 703 that encloses purlin shaped steel.
On the long limit of foundation ditch, be provided with two or more fish belly sill devices, fish belly sill device includes 2 the second angle brace seats 22,5 web member supports 17 between two the second angle brace seats, and be fixed between two the second angle brace seats and to each web member support and apply prestressed steel strand 50.
The second described angle brace seat is welded and forms successively by three sections of H shaped steel, and the web of three sections of H shaped steel is in the same plane, and three sections of H shaped steel surround an isosceles right triangle; The H shaped steel i221 that is positioned at hypotenuse is welded with a H shaped steel h222 in 1/3 position on the edge of a wing outwardly, and the both ends of H shaped steel h and H shaped steel i are all welded with junction plate; H shaped steel i is positioned at H shaped steel h mono-side and on the edge of a wing, offers the connecting hole that 2 group of two row four is listed as outwardly, and the distance of horizontal two adjacent connecting holes is a, and the distance of longitudinal two adjacent connecting holes is 2a; H shaped steel i is positioned at H shaped steel h opposite side and on the edge of a wing, offers one group of two row, 11 row and one group of two connecting hole that row six is listed as outwardly; Between web inside H shaped steel i and the edge of a wing, be welded with a plurality of reinforcing gussets, reinforce the position that gusset is positioned at H shaped steel h two ends, and the position between two adjacent groups connecting hole; The H shaped steel j223 end that is positioned at right-angle side is welded with junction plate, and the H shaped steel j edge of a wing outwardly offers the connecting hole of six group of two row's two row; The end of H shaped steel k224 and the edge of a wing vertical welding of H shaped steel j next-door neighbour end that are positioned at another right-angle side, the other end of the k of H shaped steel and H shaped steel i are away from one end welding of H shaped steel h; The H shaped steel k edge of a wing outwardly offers the connecting hole of three group of two row's two row; H shaped steel k is welded with a guide plate 225 passing for steel strand near the end position of H shaped steel i, and H shaped steel i is welded with a steel strand fixed head 226 near one end of H shaped steel k; Between H shaped steel i, H shaped steel j and H shaped steel k, be welded with a junction steel plate 227, the position that junction steel plate is positioned at the second angle brace seat middle part is provided with two steel strand anchorages 228.
Described web member support 17 includes lower-cord beam 171, with lower-cord beam web member 173 connected vertically, be connected the oblique fulcrum bar 172 of web member and lower-cord beam, also comprise the extension rod 174 with the coaxial adjustment web member length being connected of web member, and the steel strand positioning head 175 that is connected to extension rod end; Each lower-cord beam end connects successively, and the lower-cord beam that is positioned at outermost end is connected with the second angle brace seat end.
Described each the second angle brace seat is fixedly connected with capping beam by rebar connector with lower-cord beam; The below of described each web member is also supported with angle-table bracket 170, angle-table bracket and the fixing welding of H shaped steel being inserted in cement mixing pile 40.
In 5 described web member supports, be positioned at middle web member support and there is the longest web member and extension rod, be positioned at outermost web member support and there is the shortest web member and extension rod.
Described steel strand are successively on the steel strand positioning head of each web member bracket end, and the two ends of steel strand are passed the guide plate on the second angle brace seat and are fixed on steel strand fixed head and steel strand anchorage.
Described steel strand form symmetrical six parts between two the second angle brace seats and 5 web member supports, from middle, toward both sides, be followed successively by symmetrical line a501, line b502 and line c503, between line a and extension rod, form the angle of 82 degree, between line b and extension rod, form the angle of 67 degree, between line c and extension rod, form the angle of 54 degree.
Two the second angle brace seats and 5 web member support supported underneath have and the crossbeam 13 that encloses purlin shaped steel and be arranged in parallel, and described crossbeam is connected on cement mixing pile 40; Between the extension rod of three web member supports at middle part, be also connected with reinforcement.
Between two long limits of foundation ditch, be provided with at least one group to support arrangement, to support arrangement, between two adjacent groups fish belly sill device, every group includes two Eight characters supports and is connected to two one group of struts 11 between Eight characters support support arrangement.
Two groups of struts that the support of the described Eight characters includes two the second angle brace seats 22, a gusseted seat 24 and connects two the second angle brace seats and gusseted seat; Two described the second angle brace seats are bolted the enclosing between purlin shaped steel of installation site, and the second angle brace seat is connected with capping beam by rebar connector.
Described gusseted seat is isosceles right triangle, each right-angle side of gusseted seat is connected with respectively three struts, three strut other ends are connected with a reinforcement H shaped steel 15, the position of corresponding three struts of reinforcement H shaped steel opposite side is connected with three and regulates H shaped steel 16, regulates the H shaped steel other end to be connected with the H shaped steel j223 of the second angle brace seat right-angle side; Between three struts of every group, be connected with three and connect cover plate 12; Described gusseted seat right angle vertex position is connected with one perpendicular to the strut that encloses purlin shaped steel, and the strut other end connects a jack 30, and jack is connected with the purlin shaped steel that encloses between two the second angle brace seats.
Between the gusseted seat of both sides Eight characters support, by four struts, connect; Four strut supported underneath have the crossbeam vertical with strut, and crossbeam two ends are connected to two cement mixing pile tops, between two cement mixing piles, are connected with bridging 42.
During construction, adopt SMW engineering method moulding cement mixing piling wall, and build capping beam, install subsequently enclose purlin shaped steel, angle brace, to support arrangement and fish belly sill device, according to the concrete condition of foundation ditch, determine the prestressing force size of each jack and steel strand, then can carry out the excavation of foundation ditch, after foundation pit construction, the parts of supporting and protection structure can be removed, taxonomic revision is in order to reusing.

Claims (1)

1. the suspension device for the long limit of elongated rectangular shape foundation ditch, it is characterized in that: include the cement mixing pile of squeezing into along foundation ditch periphery downwards, the capping beam of reinforced concrete structure is built on cement mixing pile top, in capping beam, be connected with in week and enclose purlin shaped steel, enclose purlin shaped steel and be fixedly connected with capping beam by rebar connector;
Described rebar connector includes L shaped reinforcing bar, the minor face of L shaped reinforcing bar and the reinforcing bar in capping beam are welded and fixed, end, the long limit coaxial welding of L shaped reinforcing bar has the female reinforcing bar connector that can attachment screw of tool, thereby is connected with reinforcing bar connector and will encloses purlin shaped steel and capping beam is fixed through the screw that encloses purlin shaped steel;
On the long limit of foundation ditch, be provided with two or more fish belly sill devices, fish belly sill device includes 2 the second angle brace seats, 5 web member supports between two the second angle brace seats, and be fixed between two the second angle brace seats and to each web member support and apply prestressed steel strand;
The second described angle brace seat is welded and forms successively by three sections of H shaped steel, and the web of three sections of H shaped steel is in the same plane, and three sections of H shaped steel surround an isosceles right triangle; The H shaped steel i that is positioned at hypotenuse is welded with a H shaped steel h in 1/3 position on the edge of a wing outwardly, and the both ends of H shaped steel h and H shaped steel i are all welded with junction plate; H shaped steel i is positioned at H shaped steel h mono-side and on the edge of a wing, offers the connecting hole that 2 group of two row four is listed as outwardly, and the distance of horizontal two adjacent connecting holes is a, and the distance of longitudinal two adjacent connecting holes is 2a; H shaped steel i is positioned at H shaped steel h opposite side and on the edge of a wing, offers one group of two row, 11 row and one group of two connecting hole that row six is listed as outwardly; Between web inside H shaped steel i and the edge of a wing, be welded with a plurality of reinforcing gussets, reinforce the position that gusset is positioned at H shaped steel h two ends, and the position between two adjacent groups connecting hole; The H shaped steel j end that is positioned at right-angle side is welded with junction plate, and the H shaped steel j edge of a wing outwardly offers the connecting hole of six group of two row's two row; The end of H shaped steel k and the edge of a wing vertical welding of H shaped steel j next-door neighbour end that are positioned at another right-angle side, the other end of the k of H shaped steel and H shaped steel i are away from one end welding of H shaped steel h; The H shaped steel k edge of a wing outwardly offers the connecting hole of three group of two row's two row; H shaped steel k is welded with a guide plate passing for steel strand near the end position of H shaped steel i, and H shaped steel i is welded with a steel strand fixed head near one end of H shaped steel k; Between H shaped steel i, H shaped steel j and H shaped steel k, be welded with a junction steel plate, the position that junction steel plate is positioned at the second angle brace seat middle part is provided with two steel strand anchorages;
Described web member support includes lower-cord beam, with lower-cord beam web member connected vertically, be connected the oblique fulcrum bar of web member and lower-cord beam, also comprise the extension rod with the coaxial adjustment web member length being connected of web member, and the steel strand positioning head that is connected to extension rod end; Each lower-cord beam end connects successively, and the lower-cord beam that is positioned at outermost end is connected with the second angle brace seat end;
Described each the second angle brace seat is fixedly connected with capping beam by rebar connector with lower-cord beam; The below of described each web member is also supported with angle-table bracket, angle-table bracket and the fixing welding of H shaped steel being inserted in cement mixing pile;
In 5 described web member supports, be positioned at middle web member support and there is the longest web member and extension rod, be positioned at outermost web member support and there is the shortest web member and extension rod;
Described steel strand are successively on the steel strand positioning head of each web member bracket end, and the two ends of steel strand are passed the guide plate on the second angle brace seat and are fixed on steel strand fixed head and steel strand anchorage;
Described steel strand form symmetrical six parts between two the second angle brace seats and 5 web member supports, from middle, toward both sides, be followed successively by symmetrical line a, line b and line c, between line a and extension rod, form the angle of 82 degree, between line b and extension rod, form the angle of 67 degree, between line c and extension rod, form the angle of 54 degree;
Two the second angle brace seats and 5 web member support supported underneath have and the crossbeam that encloses purlin shaped steel and be arranged in parallel, and described crossbeam is connected on cement mixing pile; Between the extension rod of three web member supports at middle part, be also connected with reinforcement;
Between two long limits of foundation ditch, be provided with at least one group to support arrangement, to support arrangement, between two adjacent groups fish belly sill device, every group includes two Eight characters supports and is connected to two one group of struts between Eight characters support support arrangement;
Two groups of struts that described Eight characters support includes two the second angle brace seats, a gusseted seat and connects two the second angle brace seats and gusseted seat; Two described the second angle brace seats are bolted the enclosing between purlin shaped steel of installation site, and the second angle brace seat is connected with capping beam by rebar connector;
Described gusseted seat is isosceles right triangle, each right-angle side of gusseted seat is connected with respectively three struts, three strut other ends are connected with a reinforcement H shaped steel, the position of corresponding three struts of reinforcement H shaped steel opposite side is connected with three and regulates H shaped steel, regulates the H shaped steel other end to be connected with the H shaped steel j of the second angle brace seat right-angle side; Between three struts of every group, be connected with three and connect cover plate; Described gusseted seat right angle vertex position is connected with one perpendicular to the strut that encloses purlin shaped steel, and the strut other end connects a jack, and jack is connected with the purlin shaped steel that encloses between two the second angle brace seats;
Between the gusseted seat of both sides Eight characters support, by four struts, connect; Four strut supported underneath have the crossbeam vertical with strut, and crossbeam two ends are connected to two cement mixing pile tops, between two cement mixing piles, are connected with bridging.
CN201410233743.3A 2014-05-28 2014-05-28 Support unit for long sides of strip rectangular foundation ditch Pending CN103967022A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410233743.3A CN103967022A (en) 2014-05-28 2014-05-28 Support unit for long sides of strip rectangular foundation ditch

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Application Number Priority Date Filing Date Title
CN201410233743.3A CN103967022A (en) 2014-05-28 2014-05-28 Support unit for long sides of strip rectangular foundation ditch

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JPH10121500A (en) * 1996-10-16 1998-05-12 Ohbayashi Corp Construction method of outer peripheral beam of basement floor
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CN103437362A (en) * 2013-08-15 2013-12-11 浙江博雷重型机床制造有限公司 Fish belly sill part of foundation pit support inner supporting system
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CN103437362A (en) * 2013-08-15 2013-12-11 浙江博雷重型机床制造有限公司 Fish belly sill part of foundation pit support inner supporting system
CN103510521A (en) * 2013-10-09 2014-01-15 浙江博雷重型机床制造有限公司 Connecting component
CN103510514A (en) * 2013-10-09 2014-01-15 浙江博雷重型机床制造有限公司 Steel strand anchorage device base
CN203846512U (en) * 2014-05-28 2014-09-24 德清鑫德机械有限公司 Supporting device for long edges of strip-shaped and rectangular foundation pit

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Application publication date: 20140806