CN1036729C

CN1036729C - The method of supporting deep-foundation side wall

Info

Publication number: CN1036729C
Application number: CN 93110191
Authority: CN
Inventors: 周茂源
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-03-20
Filing date: 1993-03-20
Publication date: 1997-12-17
Anticipated expiration: 2013-03-20
Also published as: CN1078518A; CN1027387C

Abstract

The invention provides a kind of method of supporting deep-foundation side wall, excavate dark foundation trench 8 at ground building line inner edge, at the dark longitudinal and transverse up-hole of foundation trench 8 sidewalls, cement injection mortar, insertion anchor pole 2, on dark foundation trench 8 side wall surfaces, lay U-steel 1, U-steel 1 joins with anchor pole 2, constitutes retaining wall integral body together.Do not need to do again reinforced concrete pile, castinplace pile, diaphragm wall and explosion reaming, can supporting, have advantages such as short construction period, construction costs be low while excavating.

Description

The method of supporting deep-foundation side wall

The invention belongs to a kind of method of ground foundation engineering, particularly about a kind of method of supporting deep-foundation side wall.

All disclose a kind of " soil bolt construction " in the 573rd～574 page of in March, 1987 disclosed " Encyclopadia Sinica civil engineering " and " soil bolt design and construction standard ", the purpose of this job practices is stablizing in order to the soil layer of keeping building and institute's supporting.But as the anchor pole that pattern foundation pit supporting structure is used is after finishing the reinforced concrete pile of foundation pit enclosure structure, castinplace pile or diaphragm wall, ligand protects the excavation process, when digging the anchor pole projected depth, carry out anchor bolt construction to soil layer inside, this job practices, not only exist long construction period, shortcomings such as construction costs height, and when particularly running into hard soil layer, rock stratum, reinforced concrete pile just can't be squeezed into desired depth, and the quality of castinplace pile is difficult to guarantee, like this, the soil bolt construction just is difficult to carry out.In order to address this problem, a kind of " the explosion soil anchor bolt is stablized the reinforcing theory and the design and construction method of deep foundation pit slope " disclosed in " the geotechnical engineering journal " delivered in January, 1989, this is a kind of method that adopts horizontal blasting soil anchor bolt and channel-section steel to combine supporting deep-foundation side wall, though solved the simple soil bolt existing problem of constructing, also have following problem: 1, the explosion soil anchor bolt need be used the explosive reaming.2, owing to adopted the explosion soil anchor bolt that toe stress is concentrated, then adopt the method for digging " Ma Kou " of jumping, still do not break away from " cantilever adds anchor pole and props up retaining " form of structure at the toe place of nearly base plate.

The purpose of this invention is to provide that a kind of construction costs is low, the method for the supporting deep-foundation side wall of short construction period.

Technical solution of the present invention is: a kind of method of supporting deep-foundation side wall, its step is to be suitable for panelling construction along ground building line inner edge excavation to make things convenient for dark basic 8 of the width and the degree of depth, vertically hole at dark foundation trench 8 sidewalls apart from the following 1m of above-ground route absolute altitude place, cement injection mortar 3 in the hole, after cement mortar 3 is filled, in the hole, insert anchor pole 2, constituted cement mortar anchor pole 4 by cement mortar 3 and anchor pole 2, down lay a cement mortar anchor pole 4 again every 1.5～2.5m, laterally also lay a cement mortar anchor pole 4 at dark foundation trench 8 sidewalls every 1.5～2.5m, cement mortar anchor pole 4 has upwards constituted quincuncial arrangement in length and breadth at dark foundation trench 8 sidewalls, after having laid cement mortar anchor pole 4, transversely lay a U-steel 1 that is fastenedly connected with anchor pole 2 at dark foundation trench 8 side wall surfaces every 0.5～1.5m, cannelure shaped steel 1 length is identical with dark foundation trench 8 groove depths, lay a horizontal steel plate rib 6 every 0.5～1.5m between per two U-steels 1, constitute one deck retaining wall integral body, after finishing the upper strata panelling construction, repeat above-mentioned job practices again, and lower floor's U-steel 1 welded mutually with upper strata U-steel 1, the rest may be inferred, until subfoundation, constitute whole retaining wall.

Between described per two U-steels 1, fall for preventing miscellaneous fill, lay steel mesh reinforcement 9 on U-steel 1 top, steel mesh reinforcement 9 is connected together with U-steel 1.

The present invention compares with prior art, owing to need not do reinforced concrete pile, castinplace pile or diaphragm wall, and need not the explosive reaming, but the supporting while excavating, and therefore, short construction period, construction costs is low and can guarantee the retaining wall quality.

Fig. 1 is an embodiment of the invention first floor dado structure schematic diagram.

Fig. 2 is the embodiment of the invention second layer retaining wall schematic diagram of constructing.

Fig. 3 is an embodiment of the invention retaining wall Facad structure schematic diagram.

Fig. 4 calculates the rock-bolt length schematic diagram for the present invention.

Fig. 5 is effective rock-bolt length schematic diagram for the present invention calculates.

Below in conjunction with the description of drawings specific embodiment of the invention: when construction, at first excavate the dark foundation trench 8 of wide 4m, dark 3m along foundation building line inner edge, vertically be drilled to the hole with the 80mm hidden hole drilling at dark foundation trench 8 sidewalls apart from the following 1m of ground level place, the hole is an angling hole, hole depth or determine according to rock-bolt length, cement injection mortar 3 in the hole, after cement mortar 3 is filled, in the hole, insert Φ 22 anchor poles 2, rock-bolt length is divided into non-anchoring section 10 and anchoring section 11, determines non-anchoring section 10 and anchoring section 11 according to soil body slip-crack surface 12 sizes.Effective anchor rod anchored length utilizes on the slip-crack surface ratio of normal force and shearing to determine: and promptly (the tg Φ=KT of σ+δ), in the formula: σ--normal force on the slip-crack surface (KN); δ--anchoring section anchored force (KN); The K--safety factor, temporary supporting is got K=1.5; Shearing on the T--slip-crack surface (KN) calculates behind the anchored force δ divided by every meter anchored force (4T/m～6T/m) be anchor rod effective length Le, promptly In the hole cement injection mortar 3 with insert anchor pole 2 after constituted cement mortar anchor pole 4, cement mortar anchor pole 4 is a column type inclination anchor pole, down the every 2m of the degree of depth also lays a cement mortar anchor pole 4 again, and adjacent cement mortar anchor pole 4 is the phase anchor each other, forms quincuncial arrangement.After having laid cement mortar anchor pole 4, transversely laying one every 1m at dark foundation trench 8 side wall surfaces welds mutually with anchor pole 2, and the U-steel 1 that adopts nut 5 and anchor pole 2 to be fastened, U-steel 1 adopts 16～18 model U-steels, nut adopts M22 nut 5, cannelure shaped steel 1 length is identical with dark foundation trench 8 groove depths, between per two U-steels 1, lay a steel plate rib 6 every 1m, steel plate rib 6 adopts thickness 15mm, width 100～150mm, U-steel 1 joins and cement mortar anchor pole 4 connects and constitutes retaining wall integral body through anchor pole 2, after finishing the upper strata wall protecting method, excavate lower floor again, lower floor's U-steel 1 and upper strata U-steel 1 adopt the form of butt welding solder joint 7, and lower floor's retaining wall repeats the upper strata wall protecting method according to this, for miscellaneous fill, lay steel mesh reinforcement 9 at an upper portion thereof between per two U-steels 1, steel mesh reinforcement 9 adopts Φ 6a 250 * 250 nets, and steel mesh reinforcement 9 welds together with U-steel 1.

Claims

1, a kind of method of supporting deep-foundation side wall, its step is to be suitable for the dark foundation trench [8] that panelling construction makes things convenient for the width and the degree of depth along ground building line inner edge excavation, vertically hole at dark foundation trench [8] sidewall apart from the following 1m of above-ground route absolute altitude place, cement injection mortar [3] in the hole, after cement mortar [3] is filled, in the hole, insert anchor pole [2], constituted cement mortar anchor pole [4] by cement mortar [3] and anchor pole [2], down lay a cement mortar anchor pole [4] again every 1.5～2.5m, laterally also lay a cement mortar anchor pole [4] at dark foundation trench [8] sidewall every 1.5～2.5m, cement mortar anchor pole [4] has upwards constituted quincuncial arrangement in length and breadth at dark foundation trench [8] sidewall, after having laid cement mortar anchor pole [4], transversely lay a U-steel [1] that is fastenedly connected with anchor pole [2] at dark foundation trench [8] side wall surface every 0.5～1.5m, cannelure shaped steel [1] length is identical with dark foundation trench [8] groove depth, lay a horizontal steel plate rib [6] every 0.5～1.5m between per two U-steels [1], constitute one deck retaining wall integral body, after finishing the upper strata panelling construction, repeat above-mentioned job practices again, and lower floor's U-steel [1] welded mutually with upper strata U-steel [1], the rest may be inferred, until subfoundation, constitute whole retaining wall.

2, the method for a kind of supporting deep-foundation side wall according to claim 1 is characterized in that between described per two U-steels [1], falls for preventing miscellaneous fill, lays steel mesh reinforcement [9] on U-steel [1] top, and steel mesh reinforcement [9] is connected together with U-steel [1].