CN102720202A - 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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- CN102720202A CN102720202A CN2012102579791A CN201210257979A CN102720202A CN 102720202 A CN102720202 A CN 102720202A CN 2012102579791 A CN2012102579791 A CN 2012102579791A CN 201210257979 A CN201210257979 A CN 201210257979A CN 102720202 A CN102720202 A CN 102720202A
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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, specifically is exactly the job practices by the foundation pit supporting construction of a kind of diaphragm wall (being designated hereinafter simply as ground-connecting-wall) that the unit groove section is formed, in-line is arranged between two band seal plate metal sheet pile joints and the metal sheet pile joint.
Background technology
Safety for the smooth construction that guarantees foundation ditch and peripheral underground installation, building is provided with supporting and protection structure usually between foundation ditch and foundation pit side-wall, foundation pit supporting construction has various ways.Ground-connecting-wall is a kind of foundation pit supporting construction; In base pit engineering, obtain increasing application at present; Because ground-connecting-wall can not only be accomplished the traditional function of foundation pit supporting construction---stop the outer soil of foundation pit side-wall in foundation ditch, to move as soil-baffling structure; Prevent that as water-stop curtain the outer water of foundation pit side-wall from flowing into foundation ditch, and ground-connecting-wall can be used as skin, the carrying vertical force.
Ground-connecting-wall is made up of the joint between unit groove section, the unit groove section.In ground-connecting-wall when construction,, main construction sequence is following: use earlier groover, the employing mud off, excavate out have certain depth, the unit groove section of length and width; Place joint at unit groove Duan Erduan; Between joint, place reinforcing cage then; Concreting makes the space between concrete filling joint and the reinforcing cage, wraps up reinforcing cage with concrete, then connects into horizontal-extending, continuous ground-connecting-wall by joint and unit groove section.
The joint categories of ground-connecting-wall has four kinds of fore shaft unions, I-shaped shaped steel joint, preformed pile joint, the socket of groove section.Because concrete is two kinds of different materials with joint, with the space between concrete filling joint and the reinforcing cage after, the tiny crack of formation between the contact surface of concrete and joint easily, cause foundation ditch water outward along this crack to the foundation ditch seepage.
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 the ground-connecting-wall that has has surpassed 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 the cost and the danger of install reinforcing cage in the 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 injustice because of unit groove section two cell walls causes reinforcing cage to transfer takes place when transferring reinforcing cage also to be increased, and not only can slow down speed of application, and can strengthen construction cost; (4) possibility of formation fine cracks also increases between the contact surface of concrete and joint, causes the antiseepage function of ground-connecting-wall to reduce.
In order to guarantee the safety of foundation ditch itself, the peripheral underground installation of foundation ditch 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 the job practices of the foundation pit supporting construction of a kind of ground-connecting-wall of above-mentioned four problems of present still incompetent solution.
Summary of the invention
The object of the invention is intended to overcome four problems mentioning in the background technology, the increase of the ground-connecting-wall degree of depth causes, is formed, the in-line arrangement, can be solved the job practices of the foundation pit supporting construction of four problems mentioning in the background technology, a kind of ground-connecting-wall by the unit groove section between two bands seal plate metal sheet pile joints and the metal sheet pile joints thereby provide a kind of.
The objective of the invention is to realize through following technical scheme:
A kind of foundation pit supporting construction of diaphragm wall; It is characterized in that this foundation pit supporting construction by wing plate 1, metal sheet pile 2, ground-connecting-wall design deeply spend 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 12 of reinforcing cages constitute; Wherein the welding of metal sheet pile 2 usefulness four block plates is " II " shape; The and arranged on left and right sides face respectively has two blocks of wing plates 1, and two another block plates of wing plate 1 midline welding in a side are seal plate 11, and the length of metal sheet pile 2 equals the length that the ground-connecting-wall degree of depth 3 adds prolongation 4; The left side, each two blocks of wing plate 1 of the right of metal sheet pile 2 prolongations 4 are cut away; Be in remaining metal sheet pile central authorities and respectively bore a circular hole 5 on the tetragonal steel plate, hole 6 respectively, the prolongation 4 of two metal sheet piles 2 of above-mentioned cutting wing plate is inserted respectively hole in 6 in the bottom, two ends of unit groove section 7; And to boring 6 in placing of concrete; The two sides of unit groove section 7 are revetment 8, and 9 wedgings of four timber wedges are used in the space between two metal sheet piles 2 at the revetment 8 of two sides and two ends respectively, overlap respectively on two metal sheet piles 2 at unit groove section 7 two ends with the two ends of two channel-section steels 10; 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, and two metal sheet piles 2 are reinforced concrete structure with unit groove section 7, after concrete is fixed, timber wedge 9, channel-section steel 10 is taken out; The foundation pit supporting construction of the diaphragm wall in first unit groove section 7 is processed, and links the foundation pit supporting construction of the diaphragm wall of processing the second unit groove section 7 again by above-mentioned identical modular construction.
Described foundation pit supporting construction is characterized in that a little steel disc is welded at the two ends of described channel-section steel 10 respectively, and the little steel disc at two ends covers the top at metal sheet pile 2.
A kind of job practices of diaphragm wall foundation pit supporting construction, its construction sequence is following:
1, obstruction and underground utilities are on the ground removed in smooth place, keep levelling of the land;
2, ground on the scene is welded into four block plates the metal sheet pile 2 of " II " shape; Two blocks of wing plates (1) are each side arranged; 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, are that seal plate 11 is welded on the centre position between two blocks of wing plates 1 of a side with the 5th block plate; The degree of depth of seal plate 11=ground-connecting-wall projected depth 3, the length of the length=wing plate 1 of seal plate 11;
3, slice off prolongation 4 left sides in the metal sheet pile 2, each two blocks of wing plate 1 of the right;
4,, respectively open the circular hole 5 of a diameter 0.3m with electronic puncher in the lower end of 4 four sides of prolongation;
5, excavate the cuboid space with excavator on the ground in the field of design metal sheet pile 2, unit groove section 7; 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; The revetment 8 that the reinforcing bar that gets up with the colligation of concrete filling parcel of constructing respectively in the both sides of parallel ground-connecting-wall bearing of trend, metal sheet pile 2, unit groove section 7 is formed; The effect of revetment 8 is to prevent shallow-layer place sand to the cuboid spatial movement, the length of revetment 8=unit groove section 7 length+two ends metal sheet pile 2 length, revetment 8 degree of depth 1-2m; Revetment 8 width 0.2-0.3m, the place sand is close in revetment 8 outsides;
6, moving to groover the position of unit groove section 7 left side metal sheet piles 2, is that length about center, 3m is dug downwards along revetment 8, with metal sheet pile 2 positions, begins from ground, field to calculate the cutting depth of groover to ground-connecting-wall projected depth 3;
7, remove groover, move to metal sheet pile 2 positions to Spiral digging machine, the Spiral digging machine drill bit extend into ground-connecting-wall projected depth 3, rotary drill, and the boring 6 of spudding in, 6 diameters of holing >=metal sheet pile 2 catercorner lengths, 6 degree of depth of holing equal prolongation 4;
8, move to groover the position of unit groove section 7 right side metal sheet piles 2, repeating step 6,7.
9, hang in two metal sheet piles 2 in the boring 6 of the left and right sides, unit groove section 7 bottom with crane;
10, with timber wedge 9 with metal sheet pile 2 and revetment 8 wedgings;
11, with channel-section steel 10 2 pairs of top embeddings of two metal sheet piles at unit groove section 7 two ends are drawn, the steel disc small in ends of channel-section steel 10 covers on metal sheet pile 2;
12, toward two metal sheet piles, 2 interior concrete perfusions, then concrete flows in the space between boring 6 and the prolongation 4 through circular hole 5, is filled into till top of concrete to prolongation 4 tops, fixes the bottom of metal sheet pile 2 like this;
13, etc. between boring 6 and the prolongation 4 behind the concrete initial set in the space, with place Tu Hui town metal sheet pile 2 and ground, field extremely, the space between the sand on every side;
14, past two metal sheet piles, 2 interior concrete perfusions are to a ground;
15, move to groover the centre of unit groove section 7, dig downwards, begin from ground, field to calculate the cutting depth of groover to ground-connecting-wall projected depth 3 along revetment 8;
16, with crane along the space between 7 liang of cell walls of unit groove section, transfer to ground-connecting-wall projected depth 3 to reinforcing cage 12, and make reinforcing cage 12 2 end shapes dwindle the part be stuck between two blocks of wing plates 1, let seal plate 11 be stuck in the groove of reinforcing cage 12 2 ends simultaneously;
17,, and make the concrete top to ground, field with the space between space, seal plate 11 and the reinforcing cage 12 2 end grooves between concrete filling parcel reinforcing cage 12, reinforcing cage 12 and the two blocks of wing plates 1;
18, remove timber wedge 9, channel-section steel 10 with manual work, the space of filling up sub 9, two channel-section steels 10 of timber wedge, staying with the place sand.
The invention beneficial effect
1, concrete filling is used in the inside of metal sheet pile, has increased the rigidity of metal sheet pile.Object rigidity is big, and then object is not flexible.Therefore, reduced through concrete and metal sheet pile couple together, the degree of depth of reinforcing cage in the unit groove section, generally the 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, reduced the weight of reinforcing cage, thereby reduced the cost of install reinforcing cage in the 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 the injustice because of unit groove section two cell walls causes reinforcing cage to transfer takes place when transferring reinforcing cage also reduce, 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 the contact surface of concrete and metal sheet pile, then owing to the increase in seepage action of ground water path, then seepage velocity can reduce, and takes leaking-stopping measure easily.
Description of drawings
Fig. 1 is the metal sheet pile vertical view
Fig. 2 is the metal sheet pile panorama sketch
Fig. 3 puts into prolongation top, boring back and boring vertical view for prolongation
Fig. 4 is the channel-section steel panorama sketch
Fig. 5 is a supporting and protection structure ingredient vertical view before the concrete perfusion
Fig. 6 is a supporting and protection structure ingredient front view behind the concrete perfusion
Fig. 7 is a supporting and protection structure ingredient vertical view behind the 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-lead wall; 9-timber wedge; 10-channel-section steel; 11-seal plate; The 12-reinforcing cage.
Fig. 1 is metal sheet pile 2 vertical views; Metal sheet pile 2 is welded by five block plates, wherein welds on the four block plate planes to be " II " shape, and the steel plate that exceeds " erecting " line part is 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, and the vertical paper of five block plates is to extending below, and metal sheet pile 2 length i.e. " II " middle horizontal line length; Metal sheet pile 2 width are " erecting " line length+two block plate thickness in " II "; Metal sheet pile 2 width=unit groove section 7 width, wing plate 1 length promptly exceed the steel plate length of " erecting " line part, and metal sheet pile 2 catercorner lengths are the rectangular catercorner length that four block plates are welded into.
Can see the overall picture of metal sheet pile 2 basically clearly from Fig. 2; Metal sheet pile 2 is welded by five block plates; The degree of depth of metal sheet pile 2=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, and 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 of seal plate 11=ground-connecting-wall projected depth 3; The left side of prolongation 4, each two blocks of wing plate 1 of the right are sliced off, are beneficial to put into prolongation 4 boring 6 at unit groove section 7 two ends, and respectively there is a hole 5 lower end of four sides of prolongation 4.
Fig. 3 puts into boring 6 back prolongations 4 tops and boring 6 vertical views for prolongation 4; The left side of prolongation 4, each two blocks of wing plate 1 of the right are sliced off; Prolongation 4 can be placed in the 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, during use; 10 pairs of tops of channel-section steel are stuck between two metal sheet piles 2; Prevent that metal sheet pile 2 from moving in unit groove section 7, channel-section steel 10 steel discs small in ends cover on metal sheet pile 2, prevent that channel-section steel 10 from falling in unit groove section 7.
Fig. 5 is a supporting and protection structure ingredient vertical view before the 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 prevents that with metal sheet pile 2 and revetment 8 wedgings metal sheet pile 2 is along the displacement on the vertical ground-connecting-wall bearing of trend;
Back supporting and protection structure ingredient master looks, vertical view for construction finishes for Fig. 6, Fig. 7; Demonstration supporting and protection structure is made up of metal sheet pile 2, unit groove section 7, metal sheet pile 2 from left to right among the figure; Metal sheet pile 2 is interior by concrete filling; Reinforcing cages 12 in the unit groove section 7 are by the concrete filling parcel, with the space between two blocks of wing plates 1 of concrete filling and the reinforcing cage 12, between seal plate 11 and reinforcing cage 12 grooves, prevent that sealing is to the foundation ditch seepage.
The specific embodiment
The dark 12m of the west of a river, Nanjing, Jiangsu Province foundation ditch, foundation ditch one length of side 7.9m.Ground, field is silty clay to below ground 4m, is silt below the 4m, and below ground 1.5m is a phreatic surface.The outer 10m of foundation pit side-wall is No. 2 lines of Line of Nanjing Subway.In order to guarantee being perfectly safe of No. 2 lines of subway; Must stop the outer water and soil of foundation ditch to flow in the foundation ditch; Simultaneously in order to reduce construction investment; Owner decision is provided with ground-connecting-wall between foundation ditch and foundation pit side-wall, with the multi-function action of performance ground-connecting-wall---and retaining soil, sealing, as the exterior wall carrying vertical force of building.Ground-connecting-wall length 7.9m, degree of depth 12m, width 1m are made up of 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 welded by the steel plate of wall thickness 0.012m, metal sheet pile 2 length=0.24 m+0.012m+0.446m+0.012m+0.24m; Wall thickness 0.012m wherein, 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 job practices of foundation pit supporting construction of diaphragm wall then, its construction sequence is following.
1, obstruction and underground utilities are on the ground removed in smooth place, keep 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; Is another block plate that seal plate 11 is welded on the centre position between two blocks of wing plates 1 of a side, 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 the metal sheet pile 2, each two blocks of wing plate 1 of the right;
4, in the lower end of four sides of prolongation 4, apart from 1m place, metal sheet pile 2 bottom surface, respectively open the circular hole 5 of a diameter 0.3m with the electronic puncher of 58J;
5, excavate the cuboid space with the HB205-1 excavator on the ground in the field of design metal sheet pile 2, unit groove section 7; This cuboid length 7.9m, degree of depth 1.5m, width=unit groove section 7 width+revetment 8 width=1m+0.3m=1.3m; The revetment 8 that the reinforcing bar that gets up with the colligation of concrete filling parcel of constructing respectively in the both sides of parallel ground-connecting-wall bearing of trend, metal sheet pile 2, unit groove section 7 is formed; The effect of revetment 8 is to prevent that shallow-layer place sand is to the cuboid spatial movement; Revetment 8 length 7.9m, degree of depth 1.5m, width 0.3m, the place sand is close in revetment 8 outsides;
6, moving to the SG35 groover position of unit groove section 7 left side metal sheet piles 2, is that the length of center, 2.5m is dug downwards along revetment 8, with metal sheet pile 2 positions, begins from ground, field to calculate the cutting depth of groover to 12m ground-connecting-wall projected depth 3;
7, remove the SG35 groover; Move to metal sheet pile 2 positions to the ZR100A Spiral digging machine; ZR100A Spiral digging machine drill bit extend into 12m ground-connecting-wall projected depth 3; Rotary drill; Spud in and hole 6,6 diameter 1m>=metal sheet piles, 2 catercorner lengths of holing=
=0.96m, 6 degree of depth 12m that hole equal 12m prolongation 4;
8, move to the SG35 groover position of unit groove section 7 right side metal sheet piles 2, repeating step 6,7.
9, hang in two metal sheet piles 2 in the boring 6 of unit groove section 7 left and right sides with the QY25E crane;
10, with timber wedge 9 with metal sheet pile 2 and revetment 8 wedgings;
11, the channel-section steel 10 with width 0.05m draws 2 pairs of top embeddings of two metal sheet piles at unit groove section 7 two ends, and 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 metal sheet piles, 2 interior concrete perfusions, then concrete flows in the space between boring 6 and the prolongation 4 through circular hole 5, is filled into till top of concrete to prolongation 4 tops, fixes the bottom of metal sheet pile 2 like this;
13, etc. between boring 6 and the prolongation 4 behind the concrete initial set in the space, with place Tu Hui town metal sheet pile 2 and ground, field extremely, the space between the sand on every side;
14, past two metal sheet piles, 2 interior concrete perfusions are to a ground;
15, move to the SG35 groover centre of unit groove section 7, dig downwards, begin from ground, field to calculate the cutting depth of SG35 groover to 12m ground-connecting-wall projected depth 3 along channel-section steel 10;
16, with the QY25E crane along two channel-section steels 10, space between 7 liang of cell walls of unit groove section; Transfer to ground-connecting-wall projected depth 3 to the reinforcing cage 12 of length 6m, width 0.9m, degree of depth 12m; And make reinforcing cage 12 2 end shapes dwindle the part be stuck between two blocks of wing plates 1, let wall thickness 0.012m seal plate 11 be stuck in the groove of reinforcing cage 12 2 ends simultaneously;
17,, and make the concrete top to ground, field with the space between space, seal plate 11 and the reinforcing cage 12 2 end grooves between concrete filling parcel reinforcing cage 12, reinforcing cage 12 and the two blocks of wing plates 1;
18, remove timber wedge 9, channel-section steel 10 with manual work, the space of filling up sub 9, two channel-section steels 10 of timber wedge, staying with the place sand.
The dark 12m of Zhongshan Road, Nanjing, Jiangsu Province foundation ditch, foundation ditch one length of side 7m.Ground, field is clay to below ground 4m, is sand below the 4m, and below ground 1m is a phreatic surface.The outer 5m of foundation pit side-wall is Line of Nanjing Subway Line 1 and Zhongshan Road, transport hub, Nanjing.In order to guarantee being perfectly safe of subway Line 1 and Zhongshan Road, transport hub; Must stop the outer water and soil of foundation ditch to flow in the foundation ditch; Simultaneously in order to reduce construction investment; Owner's decision is provided with ground-connecting-wall between foundation ditch and foundation pit side-wall, with the multi-function action of performance 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 are made up of 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 welded by the steel plate of wall thickness 0.012m, metal sheet pile 2 length=0.24 m+0.012m+0.446m+0.012m+0.24m; Wall thickness 0.012m wherein, 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 job practices of foundation pit supporting construction of diaphragm wall then, its construction sequence is following.
1, obstruction and underground utilities are on the ground removed in smooth place, keep 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; Is another block plate that seal plate 11 is welded on the centre position between two blocks of wing plates 1 of a side, 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 the metal sheet pile 2, each two blocks of wing plate 1 of the right;
4, in the lower end of four sides of prolongation 4, apart from 1m place, metal sheet pile 2 bottom surface, the hole 5 of respectively opening a diameter 0.3m with the electronic puncher of 58J;
5, excavate the cuboid space with the HB205-1 excavator on the ground in the field of design metal sheet pile 2, unit groove section 7; This cuboid length 7.9m, degree of depth 1.5m, width=unit groove section 7 width+revetment 8 width=1m+0.3m=1.3m; The revetment 8 that the reinforcing bar that gets up with the colligation of concrete filling parcel of constructing respectively in the both sides of parallel ground-connecting-wall bearing of trend, metal sheet pile 2, unit groove section 7 is formed; The effect of revetment 8 is to prevent that shallow-layer place sand is to the cuboid spatial movement; Revetment 8 length 7.9m, degree of depth 1.5m, width 0.3m, the place sand is close in revetment 8 outsides;
6, moving to the SG35 groover position of unit groove section 7 left side metal sheet piles 2, is that the length of center, 2.5m is dug downwards along revetment 8, with metal sheet pile 2 positions, begins from ground, field to calculate the cutting depth of groover to 12m ground-connecting-wall projected depth 3;
7, remove the SG35 groover; Move to metal sheet pile 2 positions to the ZR100A Spiral digging machine; ZR100A Spiral digging machine drill bit extend into 12m ground-connecting-wall projected depth 3; Rotary drill; Spud in and hole 6,6 diameter 1m>=metal sheet piles, 2 catercorner lengths of holing=
=0.96m, 6 degree of depth 18m that hole equal prolongation 4;
8, move to the SG35 groover position of unit groove section 7 right side metal sheet piles 2, repeating step 6,7.
9, hang in two metal sheet piles 2 in the boring 6 of unit groove section 7 left and right sides with the QY25E crane;
10, with timber wedge 9 with metal sheet pile 2 and revetment 8 wedgings;
11, the channel-section steel 10 with width 0.05m draws 2 pairs of top embeddings of two metal sheet piles at unit groove section 7 two ends, and 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 metal sheet piles, 2 interior concrete perfusions, then concrete flows in the space between boring 6 and the prolongation 4 through hole 5, is filled into till top of concrete to prolongation 4 tops, fixes the bottom of metal sheet pile 2 like this;
13, etc. between boring 6 and the prolongation 4 behind the concrete initial set in the space, with place Tu Hui town metal sheet pile 2 and ground, field extremely, the space between the sand on every side;
14, past two metal sheet piles, 2 interior concrete perfusions are to a ground;
15, move to the SG35 groover centre of unit groove section 7, dig downwards, begin from ground, field to calculate the cutting depth of SG35 groover to 12m ground-connecting-wall projected depth 3 along channel-section steel 10;
16, with the QY25E crane along two channel-section steels 10, space between 7 liang of cell walls of unit groove section; Transfer to ground-connecting-wall projected depth 3 to the reinforcing cage 12 of length 6m, width 0.9m, degree of depth 12m; And make reinforcing cage 12 2 end shapes dwindle the part be stuck between two blocks of wing plates 1, let wall thickness 0.012m seal plate 11 be stuck in the groove of reinforcing cage 12 2 ends simultaneously;
17,, and make the concrete top to ground, field with the space between space, seal plate 11 and the reinforcing cage 12 2 end grooves between concrete filling parcel reinforcing cage 12, reinforcing cage 12 and the two blocks of wing plates 1;
18, remove timber wedge 9, channel-section steel 10 with manual work, the space of filling up sub 9, two channel-section steels 10 of timber wedge, staying with the place sand.
Claims (3)
1. the foundation pit supporting construction of a diaphragm wall; It is characterized in that deeply degree (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) constitute this foundation pit supporting construction by wing plate (1), metal sheet pile (2), ground-connecting-wall design; Wherein metal sheet pile (2) is " II " shape with the welding of four block plates; The and arranged on left and right sides face respectively has two blocks of wing plates (1); Another block plate of two blocks of wing plates (1) midline welding in a side is seal plate (11); The length of metal sheet pile (2) equals the length that the ground-connecting-wall degree of depth (3) adds prolongation (4); The left side, each two blocks of wing plate (1) of the right of metal sheet pile (2) prolongation (4) are cut away; Be in remaining metal sheet pile central authorities and respectively bore a circular hole (5) on the tetragonal steel plate,, insert the prolongation (4) of two metal sheet piles (2) of above-mentioned cutting wing plate in the boring (6) respectively in the boring (6) respectively of the bottom, two ends of unit groove section (7); And to boring (6) in placing of concrete; The two sides of unit groove section (7) are revetment (8), and four timber wedge (9) wedging is used in the space between two metal sheet piles (2) at the revetment (8) of two sides and two ends respectively, overlap respectively on two metal sheet piles (2) at unit groove section (7) two ends with the two ends of two channel-section steels (10); 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), and two metal sheet piles (2) and unit groove section (7) are reinforced concrete structure, after concrete is fixed, timber wedge (9), channel-section steel (10) is taken out; The foundation pit supporting construction of the diaphragm wall in first unit groove section (7) is processed, and links the foundation pit supporting construction of the diaphragm wall of processing the second unit groove section (7) again 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 at the two ends of described channel-section steel (10) respectively, and the little steel disc at two ends covers the top in metal sheet pile (2).
3. the job practices of a diaphragm wall foundation pit supporting construction, its construction sequence is following:
Obstruction and underground utilities are on the ground removed in A, smooth place, keep levelling of the land;
B, ground on the scene are welded into four block plates the metal sheet pile (2) of " II " shape; Two blocks of wing plates (1) are each side arranged; 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; With the 5th block plate is that seal plate (11) is welded on the centre position between two blocks of wing plates of a side (1), the degree of depth of seal plate (11)=ground-connecting-wall projected depth (3), the length of the length=wing plate (1) of seal plate (11);
C, slice off prolongation (4) left side in the metal sheet pile (2), each two blocks of wing plate (1) of the right;
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, excavate the cuboid space on the ground in the field of design metal sheet pile (2), unit groove section (7) with excavator; 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, the revetment (8) that the reinforcing bar that gets up with the colligation of concrete filling parcel of constructing respectively in the both sides of parallel ground-connecting-wall bearing of trend, metal sheet pile (2), unit groove section (7) is formed, the effect of revetment (8) is to prevent that shallow-layer place sand is to the cuboid spatial movement; The length of revetment (8)=unit groove section (7) length+two ends metal sheet pile (2) length; Revetment (8) degree of depth 1-2m, revetment (8) width 0.2-0.3m, the place sand is close in revetment (8) outside;
F, move to groover the position of unit groove (7) left side metal sheet pile (2); Along revetment (8), with metal sheet pile (2) position is that length about center, 3m is dug downwards; Begin to calculate the cutting depth of groover to ground-connecting-wall projected depth (3) from ground, field;
G, remove groover, move to metal sheet pile (2) position to Spiral digging machine, the 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, move to the position of unit groove section (7) right side metal sheet pile (2), repeating step F, G to groover;
I, hang in two metal sheet piles (2) in the boring (6) of the left and right sides, unit groove section (7) bottom with crane;
J, with timber wedge (9) with metal sheet pile (2) and revetment (8) wedging;
K, with the two piece metal sheet piles (2) of channel-section steel (10) with unit groove section (7) two ends the top embedding is drawn, 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); Then concrete flows in the space between boring (6) and the prolongation (4) through circular hole (5); Be filled into till top of concrete to prolongation (4) top, fix the bottom of metal sheet pile (2) like this;
M, etc. between boring (6) and the prolongation (4) behind the concrete initial set in the space, with place Tu Hui town metal sheet pile (2) and ground, field extremely, the space between the sand on every side;
N, the past interior concrete perfusion of two metal sheet piles (2) are to a ground;
O, move to the centre of unit groove section (7) to groover, dig downwards, begin from ground, field to calculate the cutting depth of groover to ground-connecting-wall projected depth (3) along revetment (8);
P, with crane along the space between 7 liang of cell walls of unit groove section; Transfer to ground-connecting-wall projected depth (3) to reinforcing cage (12); And make reinforcing cage (12) two end shapes dwindle the part be stuck between two blocks of wing plates (1), let 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 the two blocks of wing plates (1), and make the concrete top to a ground with concrete filling;
R, remove timber wedge (9), channel-section steel (10), the space of filling up timber wedge (9), two channel-section steels (10), staying with the place sand with manual work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210257979.1A CN102720202B (en) | 2012-07-25 | 2012-07-25 | Foundation pit supporting and protecting structure of underground continuous wall and construction method of structure |
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| CN201210257979.1A CN102720202B (en) | 2012-07-25 | 2012-07-25 | Foundation pit supporting and protecting structure of underground continuous wall and construction method of structure |
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| CN102720202B CN102720202B (en) | 2014-09-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104264683A (en) * | 2014-09-16 | 2015-01-07 | 泛华建设集团有限公司 | Concave ultra-deep foundation pit zoned supporting method for three-side surrounded cultural protection building |
| CN104481030A (en) * | 2013-06-14 | 2015-04-01 | 孔志坚 | Synchronous construction method of basement with underground continuous wall and main body |
| CN113020835A (en) * | 2021-05-17 | 2021-06-25 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN104264683A (en) * | 2014-09-16 | 2015-01-07 | 泛华建设集团有限公司 | Concave ultra-deep foundation pit zoned supporting method for three-side surrounded cultural protection building |
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| CN113020835A (en) * | 2021-05-17 | 2021-06-25 | 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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| CN102720202B (en) | 2014-09-24 |
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