CN102720202B - Foundation pit supporting and protecting structure of underground continuous wall and construction method of structure - Google Patents
Foundation pit supporting and protecting structure of underground continuous wall and construction method of structure Download PDFInfo
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- CN102720202B CN102720202B CN201210257979.1A CN201210257979A CN102720202B CN 102720202 B CN102720202 B CN 102720202B CN 201210257979 A CN201210257979 A CN 201210257979A CN 102720202 B CN102720202 B CN 102720202B
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Abstract
A foundation pit supporting and protecting structure of an underground continuous wall is composed of wing plates, metal sheet pillars, a concrete diaphragm wall design depth, extended parts, a round hole, drill holes, a unit groove section, protective walls, wood wedges, channel steels, a water-stopping plate and a steel reinforcement cage. The metal sheet pillars are welded by four steel plates into the shape of II, the left sides and the right sides of the metal sheet pillars are respectively provided with two wing plates, and another steel plate is welded at a half-way line position between the two wing plates on one side to serve as the water-stopping plate. The length of the metal sheet pillars is equal to the concrete diaphragm wall design depth plus the length of the extended parts. The two wing plates arranged on the left sides and the right sides of the extended parts are cut, two ends of the bottom of the unit groove section are respectively drilled with holes, and the extended parts of the two metal sheet pillars are respectively arranged into the drill holes and fixed through concrete pouring. Two sides of the unit groove section are the protective walls, the metal sheet pillars and the protective walls are tightly wedged through the wood wedges, small steel pieces arranged at two ends of the two channel steels respectively cover the metal sheet pillars, the steel reinforcement cage is arranged in the unit groove section, the metal sheet pillars and the unit groove section are all poured with concrete to the height of the floor, and after the concrete is solidified, the wood wedges and the channel steels are removed, thereby manufacturing the foundation pit supporting and protecting structure connected underground.
Description
Technical field
The present invention relates to a kind of foundation pit supporting construction pattern, be exactly specifically by two with the unit groove section between seal plate metal sheet pile joint and metal sheet pile joint form, the construction method of the foundation pit supporting construction of a kind of diaphragm wall (being designated hereinafter simply as ground-connecting-wall) of rods arranged in horizontal line.
Background technology
In order to ensure the safety of the smooth construction of foundation ditch and periphery underground installation, building, conventionally between foundation ditch and foundation pit side-wall, supporting and protection structure is set, foundation pit supporting construction has various ways.Ground-connecting-wall is a kind of foundation pit supporting construction, in base pit engineering, more and more applied at present, because ground-connecting-wall can not only complete the traditional function of foundation pit supporting construction---stop the soil outside foundation pit side-wall to move in foundation ditch as soil-baffling structure, prevent that as water-stop curtain the water outside foundation pit side-wall from flowing into foundation ditch, and ground-connecting-wall can be used as skin, carrying vertical force.
Ground-connecting-wall is made up of the joint between unit groove section, unit groove section.In ground-connecting-wall when construction,, main construction sequence is as follows: first use groover, adopt mud off, excavate out there is certain depth, the unit groove section of length and width; Place joint at unit groove Duan Erduan; Then between joint, place reinforcing cage; Concreting, makes the space between concrete filling joint and reinforcing cage, wraps up reinforcing cage with concrete, connects into horizontal-extending, continuous ground-connecting-wall by joint and unit groove section.
The joint categories of ground-connecting-wall has locking notch pipe joint, I-shaped shaped steel joint, joint of precast piles, groove section to be socketed four kinds.Because concrete and joint are two kinds of different materials, with behind the space between concrete filling joint and reinforcing cage, easily between concrete and the contact surface of joint, form tiny crack, cause water outside foundation ditch along this crack to Leakage of Foundation Pit.
Along with the development of urban construction, the degree of depth of foundation ditch is increasing, causes as the degree of depth of the ground-connecting-wall of one of foundation pit supporting construction also increasingly, and the degree of depth of some ground-connecting-walls has exceeded 60m.The increase of the ground-connecting-wall degree of depth can cause following problem: (1) causes the increase of the reinforcing cage degree of depth, and the increase of the reinforcing cage degree of depth can cause the increase of reinforcing bar material cost; (2) increase of the reinforcing cage degree of depth causes the increase of reinforcing cage weight, thereby has increased cost and the danger of install reinforcing cage in past unit groove section; (3) increase of the reinforcing cage degree of depth, the also corresponding increase of the degree of depth of unit groove section two cell walls, the possibility that occurs while transferring reinforcing cage to cause reinforcing cage to transfer because of the injustice of unit groove section two cell walls also increases, and not only can slow down speed of application, and can strengthen construction cost; (4) possibility that forms fine cracks between concrete and the contact surface of joint also increases, and causes the antiseepage function of ground-connecting-wall to reduce.
In order to ensure the safety of foundation ditch itself, foundation ditch periphery underground installation and above ground structure, be badly in need of solving the foundation pit supporting construction of a kind of ground-connecting-wall of above-mentioned four problems, but there is no at present the construction method that can solve the foundation pit supporting construction of a kind of ground-connecting-wall of above-mentioned four problems.
Summary of the invention
Object of the present invention is intended to overcome the four problems of mentioning in background technology, the increase of the ground-connecting-wall degree of depth causes, forms, rods arranged in horizontal line, can solve the construction method of the foundation pit supporting construction of the four problems of mentioning in background technology, a kind of ground-connecting-wall by two thereby provide a kind of with the unit groove section between seal plate metal sheet pile joint and metal sheet pile joint.
The object of the invention is to be achieved through the following technical solutions:
A kind of foundation pit supporting construction of diaphragm wall, it is characterized in that this foundation pit supporting construction is by wing plate 1, metal sheet pile 2, ground-connecting-wall design deeply spends 3, prolongation 4, circular hole 5, boring 6, unit groove section 7, revetment 8, timber wedge 9, channel-section steel 10, seal plate 11 and reinforcing cage 12 form, wherein metal sheet pile 2 use four block plate welding are " II " shape, left, respectively there are two blocks of wing plates 1 right two sides, welding another block plate in two wing plate 1 midline of a side is seal plate 11, the length of metal sheet pile 2 equals the ground-connecting-wall degree of depth 3 and adds the length of prolongation 4, by the left side of metal sheet pile 2 prolongations 4, the each two blocks of wing plates 1 in the right cut away, be each on tetragonal steel plate in remaining metal sheet pile central authorities and bore a circular hole 5, bottom, two ends in unit groove section 7 holes respectively 6, the prolongation 4 of two metal sheet piles 2 of above-mentioned cutting wing plate is inserted respectively in boring 6, and to boring 6 in placing of concrete, the two sides of unit groove section 7 are revetment 8, 9 wedgings of four timber wedge are used respectively in space between the revetment 8 of two sides and two metal sheet piles 2 at two ends, be overlapped on respectively with the two ends of two channel-section steels 10 on two metal sheet piles 2 at unit groove section 7 two ends, reinforcing cage 12 is put into unit groove section 7 between two channel-section steels 10, the concave portions at reinforcing cage 12 two ends is embedded in the seal plate 11 of two ends metal sheet pile 2, two metal sheet piles 2 and unit groove section 7 are reinforced concrete structure, after concrete is fixed by timber wedge 9, channel-section steel 10 takes out, the foundation pit supporting construction of the diaphragm wall in first unit groove section 7 is made, link the foundation pit supporting construction of the diaphragm wall of making again second unit groove section 7 by above-mentioned identical modular construction.
Described foundation pit supporting construction, is characterized in that a little steel disc is welded respectively at the two ends of described channel-section steel 10, and the little steel disc at two ends covers the top at metal sheet pile 2.
A construction method for diaphragm wall foundation pit supporting construction, its construction sequence is as follows:
1, smooth location, removes obstruction and underground utilities on the ground, keeps levelling of the land;
2, ground on the scene is welded into four block plates the metal sheet pile 2 of " II " shape, each side there are two blocks of wing plates (1), metal sheet pile 2 degree of depth=ground-connecting-wall projected depth 3+ prolongation 4, respectively there are two blocks of wing plates 1 on the left side of ground-connecting-wall projected depth 3, the right, be that seal plate 11 is welded on the centre position between two blocks of wing plates 1 of a side by the 5th block plate, the degree of depth=ground-connecting-wall projected depth 3 of seal plate 11, the length of the length=wing plate 1 of seal plate 11;
3, slice off prolongation 4 left sides in metal sheet pile 2, the each two blocks of wing plates 1 in the right;
4,, in the lower end of 4 four sides of prolongation, respectively open the circular hole 5 of a diameter 0.3m with electronic puncher;
5, with excavator design metal sheet pile 2, on the place of unit groove section 7, excavate cuboid space, this cuboid degree of depth 1-2m, cuboid length=two metal sheet pile 2 length+unit groove section 7 length, cuboid width=unit groove section 7 width+revetment 8 width, at parallel ground-connecting-wall bearing of trend, metal sheet pile 2, construct the respectively revetment 8 of the reinforcing bar composition getting up with the colligation of concrete filling parcel of the both sides of unit groove section 7, the effect of revetment 8 is to prevent that shallow-layer place sand from moving to cuboid space, length=unit groove section 7 length+two ends metal sheet pile 2 length of revetment 8, revetment 8 degree of depth 1-2m, revetment 8 width 0.2-0.3m, place sand is close in revetment 8 outsides,
6, groover is moved to the position of unit groove section 7 left side metal sheet piles 2, along revetment 8, centered by metal sheet pile 2 positions, the length of about 3m digs downwards, starts to calculate from Ground, the cutting depth of groover is to ground-connecting-wall projected depth 3;
7, remove groover, Spiral digging machine is moved to metal sheet pile 2 positions, Spiral digging machine drill bit extend into ground-connecting-wall projected depth 3, rotary drill, and the boring 6 of spudding in, boring 6 diameters >=metal sheet pile 2 catercorner lengths, boring 6 degree of depth equal prolongation 4;
8, groover is moved to the position of unit groove section 7 right side metal sheet piles 2, repeating step 6,7;
9, two metal sheet piles 2 are hung in the boring 6 of unit groove section 7 left and right sides, bottom with crane;
10, use timber wedge 9 by metal sheet pile 2 and revetment 8 wedgings;
11, with channel-section steel 10, two metal sheet piles 2 at unit groove section 7 two ends are drawn top embedding, the steel disc small in ends of channel-section steel 10 covers on metal sheet pile 2;
12, toward two interior concrete perfusions of metal sheet pile 2, concrete flows in the space between boring 6 and prolongation 4 by circular hole 5, till being filled into top of concrete to prolongation 4 and pushing up, like this bottom of metal sheet pile 2 is fixed;
13, etc. between boring 6 and prolongation 4 after the concrete initial set in space, with Site Soil return town metal sheet pile 2 and around the space between sand to Ground;
14, toward two interior concrete perfusions of metal sheet pile 2 to Ground;
15, groover is moved to the centre of unit groove section 7, dig downwards along revetment 8, start to calculate from Ground, the cutting depth of groover is to ground-connecting-wall projected depth 3;
16, with crane along the space between 7 liang of cell walls of unit groove section, reinforcing cage 12 is transferred to ground-connecting-wall projected depth 3, and make reinforcing cage 12 2 end shapes dwindle part be stuck between two blocks of wing plates 1, allow seal plate 11 be stuck in the groove of reinforcing cage 12 2 ends simultaneously;
17, with the space between space, seal plate 11 and reinforcing cage 12 2 end grooves between concrete filling parcel reinforcing cage 12, reinforcing cage 12 and two blocks of wing plates 1, and concrete is pushed up to Ground;
18, with manually removing timber wedge 9, channel-section steel 10, the space of filling up timber wedge 9, two channel-section steels 10, staying with place sand.
Invention beneficial effect
1, the inside concrete filling of metal sheet pile, has increased the rigidity of metal sheet pile.Object rigidity is large, and object is not flexible.Therefore, reduced by concrete and metal sheet pile couple together, the degree of depth of reinforcing cage in unit groove section, one reinforcing cage degree of depth than conventional ground-connecting-wall reduces 1/3rd to 1/2nd.
2, reducing of the reinforcing cage degree of depth, can reduce the material cost of ground-connecting-wall, has reduced the weight of reinforcing cage, thereby has reduced the cost of install reinforcing cage in past unit groove section.
3, the minimizing of the reinforcing cage degree of depth, the cell wall degree of depth of unit groove section also reduces, and the possibility that occurs while transferring reinforcing cage to cause reinforcing cage to transfer because of the injustice of unit groove section two cell walls also reduces, and can not only accelerate speed of application, and can reduce construction cost.
4, seal plate is stuck in the groove of reinforcing cage two ends, if form fine cracks between concrete and the contact surface of metal sheet pile,, due to the increase in seepage action of ground water path, seepage velocity can reduce, and easily takes leaking-stopping measure.
Brief description of the drawings
Fig. 1 is metal sheet pile top view
Fig. 2 is metal sheet pile panorama sketch
Fig. 3 is that after prolongation is put into boring, prolongation pushes up and boring top view
Fig. 4 is channel-section steel panorama sketch
Fig. 5 is supporting and protection structure ingredient top view before concrete perfusion
Fig. 6 is supporting and protection structure ingredient front view after concrete perfusion
Fig. 7 is supporting and protection structure ingredient top view after concrete perfusion
Reference numeral: 1-wing plate; 2-metal sheet pile; 3-ground-connecting-wall projected depth; 4-prolongation; 5-hole; 6-boring; 7-unit groove section; 8-leads wall; 9-timber wedge; 10-channel-section steel; 11-seal plate; 12-reinforcing cage.
Fig. 1 is metal sheet pile 2 top views, metal sheet pile 2 is welded by five block plates, wherein in four block plate planes, weld and be " II " shape, exceed the steel plate of " erecting " line part wing plate 1, it is seal plate 11 that the 5th block plate is welded in centre position between two blocks of wing plates 1 of a side again, the length of seal plate 11 equals the length of wing plate 1, the vertical paper of five block plates is to downward-extension, metal sheet pile 2 length i.e. " II " middle horizontal line length, metal sheet pile 2 width are " erecting " line length+bis-block plate thickness in " II ", metal sheet pile 2 width=unit groove section 7 width, wing plate 1 length exceed the steel plate length of " erecting " line part, the metal sheet pile 2 catercorner lengths rectangular catercorner length that four block plates are welded into.
Can substantially see the overall picture of metal sheet pile 2 clearly from Fig. 2, metal sheet pile 2 is welded by five block plates, the degree of depth=ground-connecting-wall projected depth 3+ prolongation 4 of metal sheet pile 2, the left side of ground-connecting-wall projected depth 3, respectively there are two blocks of wing plates 1 on the right, wherein the centre position between two of a side blocks of wing plates 1 is welded with a seal plate 11, the degree of depth=ground-connecting-wall projected depth 3 of seal plate 11, the left side of prolongation 4, the each two blocks of wing plates 1 in the right are sliced off, be beneficial to prolongation 4 to put into the boring 6 at unit groove section 7 two ends, respectively there is a hole 5 lower end of four sides of prolongation 4.
Fig. 3 is that prolongation 4 is put into the rear prolongation of boring 64 tops and boring 6 top views, the left side of prolongation 4, the each two blocks of wing plates 1 in the right are sliced off, prolongation 4 can be placed in boring 6, and the degree of depth of boring 6 equals prolongation 4, diameter >=metal sheet pile 2 catercorner lengths of boring 6.
Fig. 4 is channel-section steel 10 panorama sketchs, and little steel disc is welded at the two ends of channel-section steel 10, when use, channel-section steel 10 is stuck between two metal sheet piles 2 top, prevent that metal sheet pile 2 is to the interior movement of unit groove section 7, channel-section steel 10 steel disc small in ends covers on metal sheet pile 2, prevents that channel-section steel 10 from falling in unit groove section 7.
Fig. 5 is supporting and protection structure ingredient top view before concrete perfusion, reinforcing cage 12 is positioned at unit groove section 7, respectively there is a groove at reinforcing cage 12 two ends, so that seal plate 11 can stick in the groove at reinforcing cage 12 two ends, timber wedge 9, by metal sheet pile 2 and revetment 8 wedgings, prevents that metal sheet pile 2 is along the displacement on vertical ground-connecting-wall bearing of trend;
Rear supporting and protection structure ingredient master looks, top view for construction finishes for Fig. 6, Fig. 7, in figure, show that supporting and protection structure is made up of metal sheet pile 2, unit groove section 7, metal sheet pile 2 from left to right, metal sheet pile 2 is interior by concrete filling, reinforcing cage 12 in unit groove section 7 is wrapped up by concrete filling, with the space between two blocks of wing plates 1 of concrete filling and reinforcing cage 12, between seal plate 11 and reinforcing cage 12 grooves, anti-sealing is to Leakage of Foundation Pit.
Detailed description of the invention
Embodiment 1
The dark 12m of the west of a river, Nanjing foundation ditch, foundation ditch one length of side 7.9m.Ground is silty clay to below ground 4m, and 4m is silt below, and below ground 1.5m is phreatic surface.The outer 10m of foundation pit side-wall is No. 2 lines of Line of Nanjing Subway.In order to ensure being perfectly safe of Line 2 Metro, must stop the water and soil outside foundation ditch to flow in foundation ditch, simultaneously in order to reduce construction investment, owner determines, between foundation ditch and foundation pit side-wall, ground-connecting-wall is set, to bring into play the multi-function action of ground-connecting-wall---and keep off soil, sealing, carry vertical force as the exterior wall of building.Ground-connecting-wall length 7.9m, degree of depth 12m, width 1m, formed by a unit groove section 7 and two metal sheet piles 2, unit groove section 7 length 6m, degree of depth 12m, width 1m, metal sheet pile 2 degree of depth=12m ground-connecting-wall projected depth 3+12m prolongation 4, metal sheet pile 2 is formed by the Plate Welding of wall thickness 0.012m, metal sheet pile 2 length=0.24m+0.012m+0.446m+0.012m+0.24m, wherein wall thickness 0.012m, wing plate 1 length=0.24m, metal sheet pile 2 width=0.012m+0.85m+0.012m=0.874m, the centre position of seal plate 11 between two blocks of wing plates 1, the degree of depth=12m, length=0.24m, wall thickness 0.012m, a kind of construction method of foundation pit supporting construction of diaphragm wall, its construction sequence is as follows.
1, smooth location, removes obstruction and underground utilities on the ground, keeps levelling of the land;
2, ground on the scene is welded into four block plates of wall thickness 0.012m the metal sheet pile 2 of " II " font, metal sheet pile 2 degree of depth 24m=12m ground-connecting-wall projected depth 3+12m prolongations 4, respectively there are two blocks of wing plates 1 on the left side of ground-connecting-wall projected depth 3, the right, be that seal plate 11 is welded on the centre position between two blocks of wing plates 1 of a side another block plate, seal plate 11 degree of depth 12m=12m ground-connecting-wall projected depths 3, seal plate 11 length=wing plate 1 length=0.24m;
3, slice off prolongation 4 left sides in metal sheet pile 2, the each two blocks of wing plates 1 in the right;
4, in the lower end of four sides of prolongation 4, apart from metal sheet pile 2 1m places, bottom surface, respectively open the circular hole 5 of a diameter 0.3m with the electronic puncher of 58J;
5, on the place of design metal sheet pile 2, unit groove section 7, excavate cuboid space with HB205-1 excavator, this cuboid length 7.9m, degree of depth 1.5m, width=unit groove section 7 width+revetment 8 width=1m+0.3m=1.3m, construct respectively in the both sides of parallel ground-connecting-wall bearing of trend, metal sheet pile 2, unit groove section 7 revetment 8 of the reinforcing bar composition getting up with the colligation of concrete filling parcel, the effect of revetment 8 is to prevent that shallow-layer place sand from moving to cuboid space, revetment 8 length 7.9m, degree of depth 1.5m, width 0.3m, place sand is close in revetment 8 outsides;
6, SG35 groover is moved to the position of unit groove section 7 left side metal sheet piles 2, along revetment 8, centered by metal sheet pile 2 positions, the length of 2.5m digs downwards, starts to calculate from Ground, the cutting depth of groover is to 12m ground-connecting-wall projected depth 3;
7, remove SG35 groover, ZR100A Spiral digging machine is moved to metal sheet pile 2 positions, ZR100A Spiral digging machine drill bit extend into 12m ground-connecting-wall projected depth 3, rotary drill, spud in and hole 6, boring 6 diameter 1m >=metal sheet pile 2 catercorner lengths==0.96m, boring 6 degree of depth 12m equal 12m prolongation 4;
8, SG35 groover is moved to the position of unit groove section 7 right side metal sheet piles 2, repeating step 6,7.
9, two metal sheet piles 2 are hung in the boring 6 of unit groove section 7 left and right sides with QY25E crane;
10, use timber wedge 9 by metal sheet pile 2 and revetment 8 wedgings;
11, with the channel-section steel 10 of width 0.05m, two metal sheet piles 2 at unit groove section 7 two ends are drawn top embedding, the steel disc small in ends of channel-section steel 10 covers on metal sheet pile 2, and the distance between two channel-section steels 10 is 0.9m;
12, toward two interior concrete perfusions of metal sheet pile 2, concrete flows in the space between boring 6 and prolongation 4 by circular hole 5, till being filled into top of concrete to prolongation 4 and pushing up, like this bottom of metal sheet pile 2 is fixed;
13, etc. between boring 6 and prolongation 4 after the concrete initial set in space, with Site Soil return town metal sheet pile 2 and around the space between sand to Ground;
14, toward two interior concrete perfusions of metal sheet pile 2 to Ground;
15, SG35 groover is moved to the centre of unit groove section 7, dig downwards along channel-section steel 10, start to calculate from Ground, the cutting depth of SG35 groover is to 12m ground-connecting-wall projected depth 3;
16, with QY25E crane along two channel-section steels 10, space between 7 liang of cell walls of unit groove section, the reinforcing cage 12 of length 6m, width 0.9m, degree of depth 12m is transferred to ground-connecting-wall projected depth 3, and make reinforcing cage 12 2 end shapes dwindle part be stuck between two blocks of wing plates 1, allow wall thickness 0.012m seal plate 11 be stuck in the groove of reinforcing cage 12 2 ends simultaneously;
17, with the space between space, seal plate 11 and reinforcing cage 12 2 end grooves between concrete filling parcel reinforcing cage 12, reinforcing cage 12 and two blocks of wing plates 1, and concrete is pushed up to Ground;
18, with manually removing timber wedge 9, channel-section steel 10, the space of filling up timber wedge 9, two channel-section steels 10, staying with place sand.
Embodiment 2
The dark 12m of Zhongshan Road, Nanjing foundation ditch, foundation ditch one length of side 7m.Ground is clay to below ground 4m, and 4m is sand below, and below ground 1m is phreatic surface.The outer 5m of foundation pit side-wall is Metro Line 1 in Nanjing and Nanjing city traffic hinge Zhongshan Road.In order to ensure being perfectly safe of subway Line 1 and Zhongshan Road, transport hub, must stop the water and soil outside foundation ditch to flow in foundation ditch, simultaneously in order to reduce construction investment, owner determines, between foundation ditch and foundation pit side-wall, ground-connecting-wall is set, to bring into play the multi-function action of ground-connecting-wall---and keep off soil, sealing, carry vertical force as skin.Ground-connecting-wall length 7.9m, degree of depth 12m, width 1m, formed by a unit groove section 7 and two metal sheet piles 2, unit groove section 7 length 6m, degree of depth 12m, width 1m, metal sheet pile 2 degree of depth=12m ground-connecting-wall projected depth 3+18m prolongation 4, metal sheet pile 2 is formed by the Plate Welding of wall thickness 0.012m, metal sheet pile 2 length=0.24m+0.012m+0.446m+0.012m+0.24m, wherein wall thickness 0.012m, wing plate 1 length=0.24m, metal sheet pile 2 width=0.012m+0.85m+0.012m=0.874m, the centre position of seal plate 11 between two blocks of wing plates 1, the degree of depth=12m, length=0.24m, wall thickness 0.012m, a kind of construction method of foundation pit supporting construction of diaphragm wall, its construction sequence is as follows.
1, smooth location, removes obstruction and underground utilities on the ground, keeps levelling of the land;
2, ground on the scene is welded into four block plates of wall thickness 0.012m the metal sheet pile 2 of " II " font, metal sheet pile 2 degree of depth 24m=12m ground-connecting-wall projected depth 3+18m prolongations 4, respectively there are two blocks of wing plates 1 on the left side of ground-connecting-wall projected depth 3, the right, be that seal plate 11 is welded on the centre position between two blocks of wing plates 1 of a side another block plate, seal plate 11 degree of depth 12m=12m ground-connecting-wall projected depths 3, seal plate 11 length=wing plate 1 length=0.24m;
3, slice off prolongation 4 left sides in metal sheet pile 2, the each two blocks of wing plates 1 in the right;
4, in the lower end of four sides of prolongation 4, apart from metal sheet pile 2 1m places, bottom surface, the hole 5 of respectively opening a diameter 0.3m with the electronic puncher of 58J;
5, on the place of design metal sheet pile 2, unit groove section 7, excavate cuboid space with HB205-1 excavator, this cuboid length 7.9m, degree of depth 1.5m, width=unit groove section 7 width+revetment 8 width=1m+0.3m=1.3m, construct respectively in the both sides of parallel ground-connecting-wall bearing of trend, metal sheet pile 2, unit groove section 7 revetment 8 of the reinforcing bar composition getting up with the colligation of concrete filling parcel, the effect of revetment 8 is to prevent that shallow-layer place sand from moving to cuboid space, revetment 8 length 7.9m, degree of depth 1.5m, width 0.3m, place sand is close in revetment 8 outsides;
6, SG35 groover is moved to the position of unit groove section 7 left side metal sheet piles 2, along revetment 8, centered by metal sheet pile 2 positions, the length of 2.5m digs downwards, starts to calculate from Ground, the cutting depth of groover is to 12m ground-connecting-wall projected depth 3;
7, remove SG35 groover, ZR100A Spiral digging machine is moved to metal sheet pile 2 positions, ZR100A Spiral digging machine drill bit extend into 12m ground-connecting-wall projected depth 3, rotary drill, spud in and hole 6, boring 6 diameter 1m >=metal sheet pile 2 catercorner lengths==0.96m, boring 6 degree of depth 18m equal prolongation 4;
8, SG35 groover is moved to the position of unit groove section 7 right side metal sheet piles 2, repeating step 6,7.
9, two metal sheet piles 2 are hung in the boring 6 of unit groove section 7 left and right sides with QY25E crane;
10, use timber wedge 9 by metal sheet pile 2 and revetment 8 wedgings;
11, with the channel-section steel 10 of width 0.05m, two metal sheet piles 2 at unit groove section 7 two ends are drawn top embedding, the steel disc small in ends of channel-section steel 10 covers on metal sheet pile 2, and the distance between two channel-section steels 10 is 0.9m;
12, toward two interior concrete perfusions of metal sheet pile 2, concrete flows in the space between boring 6 and prolongation 4 by hole 5, till being filled into top of concrete to prolongation 4 and pushing up, like this bottom of metal sheet pile 2 is fixed;
13, etc. between boring 6 and prolongation 4 after the concrete initial set in space, with Site Soil return town metal sheet pile 2 and around the space between sand to Ground;
14, toward two interior concrete perfusions of metal sheet pile 2 to Ground;
15, SG35 groover is moved to the centre of unit groove section 7, dig downwards along channel-section steel 10, start to calculate from Ground, the cutting depth of SG35 groover is to 12m ground-connecting-wall projected depth 3;
16, with QY25E crane along two channel-section steels 10, space between 7 liang of cell walls of unit groove section, the reinforcing cage 12 of length 6m, width 0.9m, degree of depth 12m is transferred to ground-connecting-wall projected depth 3, and make reinforcing cage 12 2 end shapes dwindle part be stuck between two blocks of wing plates 1, allow wall thickness 0.012m seal plate 11 be stuck in the groove of reinforcing cage 12 2 ends simultaneously;
17, with the space between space, seal plate 11 and reinforcing cage 12 2 end grooves between concrete filling parcel reinforcing cage 12, reinforcing cage 12 and two blocks of wing plates 1, and concrete is pushed up to Ground;
18, with manually removing timber wedge 9, channel-section steel 10, the space of filling up timber wedge 9, two channel-section steels 10, staying with place sand.
Claims (3)
1. the foundation pit supporting construction of a diaphragm wall, it is characterized in that this foundation pit supporting construction is by wing plate (1), metal sheet pile (2), ground-connecting-wall projected depth (3), prolongation (4), circular hole (5), boring (6), unit groove section (7), revetment (8), timber wedge (9), channel-section steel (10), seal plate (11) and reinforcing cage (12) form, wherein metal sheet pile (2) is " II " shape with four block plate welding, left, respectively there are two blocks of wing plates (1) right two sides, welding another block plate in two blocks of wing plates (1) midline of same side is seal plate (11), the length of metal sheet pile (2) equals ground-connecting-wall projected depth (3) and adds prolongation (4), by the left side of metal sheet pile (2) prolongation (4), the each two blocks of wing plates in the right (1) cut away, be each circular hole (5) that bores on tetragonal steel plate in remaining metal sheet pile central authorities, in the boring (6) respectively of the bottom, two ends of unit groove section (7), the prolongation (4) of two metal sheet piles (2) of above-mentioned cutting wing plate is inserted respectively in boring (6), and to the middle placing of concrete of boring (6), the two sides of unit groove section (7) are revetment (8), four timber wedge (9) wedging is used respectively in gap between the revetment (8) of two sides and two metal sheet piles (2) at two ends, be overlapped on respectively with the two ends of two channel-section steels (10) on two metal sheet piles (2) at unit groove section (7) two ends, reinforcing cage (12) is put between two channel-section steels (10) to unit groove section (7), the concave portions at reinforcing cage (12) two ends is embedded in the seal plate (11) of two ends metal sheet pile (2), two metal sheet piles (2) and unit groove section (7) are reinforced concrete structure, after concrete is fixed by timber wedge (9), channel-section steel (10) takes out, the foundation pit supporting construction of the diaphragm wall in first unit groove section (7) is made, link the foundation pit supporting construction of the diaphragm wall of making again second unit groove section (7) by above-mentioned identical modular construction.
2. foundation pit supporting construction according to claim 1, is characterized in that a little steel disc is welded respectively at the two ends of described channel-section steel (10), and the little steel disc at two ends covers the top in metal sheet pile (2).
3. a construction method for diaphragm wall foundation pit supporting construction, its construction sequence is as follows:
A, smooth location, remove obstruction and underground utilities on the ground, keeps levelling of the land;
B, ground on the scene is welded into four block plates the metal sheet pile (2) of " II " shape, each side there are two blocks of wing plates (1), metal sheet pile (2) degree of depth=ground-connecting-wall projected depth (3)+prolongation (4), the left side of ground-connecting-wall projected depth (3), respectively there are two blocks of wing plates (1) on the right, the left side of prolongation (4), the each two blocks of wing plates in the right (1), be that seal plate (11) is welded on the centre position between two blocks of wing plates of a side (1) by the 5th block plate, the degree of depth=ground-connecting-wall projected depth 3 of seal plate (11), the length of the length=wing plate (1) of seal plate (11),
C, slice off prolongation (4) left side, the each two blocks of wing plates in the right (1) in metal sheet pile (2);
D, in the lower end of (4) four sides of prolongation, respectively open the circular hole (5) of a diameter 0.3m with electronic puncher;
E, with excavator design metal sheet pile (2), on the place of unit groove section (7), excavate cuboid space, this cuboid degree of depth 1-2m, cuboid length=two metal sheet pile (2) length+unit groove section (7) length, cuboid width=unit groove section (7) width+revetment (8) width, at parallel ground-connecting-wall bearing of trend, metal sheet pile (2), construct the respectively revetment (8) of the reinforcing bar composition getting up with the colligation of concrete filling parcel of the both sides of unit groove section (7), the effect of revetment (8) is to prevent that shallow-layer place sand from moving to cuboid space, length=unit groove section (7) length+two ends metal sheet piles (2) length of revetment (8), revetment (8) degree of depth 1-2m, revetment (8) width 0.2-0.3m, place sand is close in revetment (8) outside,
F, groover is moved to the position of unit groove section (7) left side metal sheet pile (2), along revetment (8), centered by metal sheet pile (2) diagonal position of intersecting point, along ground-connecting-wall bearing of trend 3m place digging downwards, start to calculate from Ground, the cutting depth of groover is to ground-connecting-wall projected depth (3);
G, remove groover, Spiral digging machine is moved to metal sheet pile (2) position, Spiral digging machine drill bit extend into ground-connecting-wall projected depth (3), rotary drill, the boring (6) of spudding in, boring (6) diameter >=metal sheet pile (2) catercorner length, boring (6) degree of depth equals prolongation (4);
H, groover is moved to the position of unit groove section (7) right side metal sheet pile (2), repeating step F, G;
I, two metal sheet piles (2) are hung in the boring (6) of unit groove section (7) left and right sides with crane;
J, with timber wedge, (9 by metal sheet pile (2) and revetment (8) wedging;
K, with channel-section steel, (10 by unit groove section, (two metal sheet piles (2) at 7 two ends draw top embedding, and the steel disc small in ends of channel-section steel (10) covers on metal sheet pile (2);
L, the past interior concrete perfusion of two metal sheet piles (2), concrete flows in the space between boring (6) and prolongation (4) by hole (5), be filled into top of concrete to till prolongation (4) top, like this bottom of metal sheet pile (2) fixed;
M, etc. between boring (6) and prolongation (4) after the concrete initial set in space, with Site Soil return town metal sheet pile (2) and around the space between sand to Ground;
N, the past interior concrete perfusion of two metal sheet piles (2) are to Ground;
O, groover is moved to the centre of unit groove section (7), dig downwards along revetment (8), start to calculate from Ground, the cutting depth of groover is to ground-connecting-wall projected depth (3);
P, use crane are along the space between unit groove section (7) two cell walls, reinforcing cage (12) is transferred to ground-connecting-wall projected depth (3), and make reinforcing cage (12) two end shapes dwindle part be stuck between two blocks of wing plates (1), allow seal plate (11) be stuck in the groove of reinforcing cage (12) two ends simultaneously;
Q, wrap up the space between space, seal plate (11) and reinforcing cage (12) the two end grooves between reinforcing cage (12), reinforcing cage (12) and two blocks of wing plates (1) with concrete filling, and concrete is pushed up to Ground;
R, with manually removing timber wedge (9), channel-section steel (10), the space of filling up timber wedge (9), two channel-section steels (10), staying with place sand.
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| CN104481030A (en) * | 2013-06-14 | 2015-04-01 | 孔志坚 | Synchronous construction method of basement with underground continuous wall and main body |
| CN104264683B (en) * | 2014-09-16 | 2015-11-18 | 泛华建设集团有限公司 | Building concave shape ultra-deep foundation pit subregion supporting method is protected for three around literary composition |
| CN113020835B (en) * | 2021-05-17 | 2022-08-05 | 中铁广州工程局集团深圳工程有限公司 | Equivalent ground wall reinforcement cage welding method capable of avoiding stress concentration |
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| JPS5664028A (en) * | 1979-10-31 | 1981-06-01 | Maeda Kensetsu Kogyo Kk | Sheathing construction work by antecedent support framework |
| JPS58160435A (en) * | 1982-03-15 | 1983-09-22 | Tsutae Saito | Waling and back-filling work for underground continuous wall and waling rack-forming metal therefor |
| CN101560767A (en) * | 2009-05-12 | 2009-10-21 | 广东省长大公路工程有限公司 | Method for connecting slotted sections in underground construction of diaphragm wall |
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