Composite soil nailing wall and pile-anchor retaining composite supporting construction
Pattern foundation pit supporting structure field is the utility model is related to, more particularly to a kind of composite soil nailing wall and pile-anchor retaining composite support knot
Base pit engineering is that protection underground space open-cut is smoothed out without prejudice with surrounding enviroment and taken interim
Supporting and soil stabilization engineering.Two kinds of common support forms of pattern foundation pit supporting structure field are pile-anchor retaining and Composition Soil Nailing Walls.
In pattern foundation pit supporting structure, when space meets slope condition, preferred pair foundation pit side-wall carries out slope, is coordinated with less sloping coefficient
Composite soil nailing wall carries out supporting.But slope needs to take the space on foundation ditch and periphery, the field being limited for construction space in itself
Close, must just increase sloping coefficient or upright excavation, and carry out the pile-anchor retaining of foundation pit side-wall, i.e., coordinated with reinforced concrete pile
The form of prestressed anchor carries out side wall supporting.
For above two support form, the support capacity of composite soil nailing wall is limited, and cost is relatively low；Pile-anchor retaining
Earth-retaining ability it is strong, but to reach expected retaining support effect, it is necessary to use more slope protection piles, and inserted in inter-pile soil
Prestressed anchor, construction cost are higher.Therefore, in work progress, often two kinds of supportings are used in combination, form composite soil nailing
Wall and piled anchor composite support system.
But during foundation pit construction, often occur that artificial earth fill's thickness degree is larger in foundation ditch and slope space is smaller
Complex working condition, due to the poor mechanical property of back fill course, in stretch-draw prestressing force anchor pole, pre- on composite soil nailing wall should
The rod end of power anchor pole can destroy slope boss for the pressure of the soil body, and this not only results in the supporting of composite soil nailing wall by shadow
Ring, it is also possible to cause the stress of prestressed anchor to fail.
Utility model content
The purpose of this utility model is to provide the composite support system that a kind of piled anchor is used in conjunction with composite soil nailing wall, and it passes through
Stress transferring structure is set between prestressed anchor and slope protection pile so that the stretching force of prestressed anchor can be transmitted effectively
To slope protection pile, and slope boss is not destroyed.
Above-mentioned purpose of the present utility model technical scheme is that：A kind of composite soil nailing wall and piled anchor
Supporting composite supporting construction, applied on the foundation pit side-wall between ground and bottom of foundation ditch, wrapped successively from ground to bottom of foundation ditch
Include the vertical supporting section of at least row's slope protection pile formation, and the slope section that soil nailing face wall is formed, the vertical supporting Duan Yufang
Some prestressed anchors are provided with the section of slope, the prestressed anchor of same longitudinal height is all connected to one in slope section
Along along the horizontally disposed channel-section steel of prestressed anchor distribution arrangement, steel pipe is provided between channel-section steel and slope protection pile, the two of the steel pipe
End contradicts channel-section steel close to the face of soil nailing face wall and the side wall of slope protection pile respectively.
By using above-mentioned technical proposal, the end of prestressed anchor tenses channel-section steel, and power is transferred on channel-section steel, channel-section steel with
Steel pipe is set between slope protection pile, and the power that channel-section steel is born finally is transferred to slope protection pile by steel pipe, in the prestressed anchor of slope section
A kind of effective force structure is formed by this form between bar and slope protection pile, prevents prestressed anchor in stretching process by soil
Soil body crimp between nail face wall and slope protection pile causes slope boss to deform.
Preferably, it is provided with a soil nailing along between longitudinally and/or laterally adjacent prestressed anchor.
By using above-mentioned technical proposal, the supporting effect of prestressed anchor is good, but corresponding cost is high, and work progress
It is relatively complicated；And soil nailing low cost supporting effect is not good enough, both are used in combination, interleaves setting, can meet that supporting will
While asking, the cost of construction is reduced as far as possible.
Preferably, prestressed anchor passes through the U-shaped bottom of the channel-section steel, and pad is provided with one between prestressed anchor and channel-section steel
By using above-mentioned technical proposal, billet can increase the resistance surface between the end of prestressed anchor and channel-section steel
Product, so that prestressed anchor is relatively reliable to be transferred to channel-section steel by power, and then is transferred to steel pipe and slope protection pile.
Preferably, the slope protection pile is reinforced concrete pile, is all connected at the top of the slope protection pile by Guan Liang.
By using above-mentioned technical proposal, the shear resistance and support capacity of reinforced concrete pile are preferable, and bank protection is used as using it
Stake can be very good to play the effect of foundation pit side-wall supporting, and using Guan Liang as slope protection pile at the top of attachment structure, can make entirely
Portion's slope protection pile forms an entirety.
Preferably, an at least steel-pipe pile is provided between the adjacent slope protection pile.
By using above-mentioned technical proposal, the supporting effect of reinforced concrete pile is good, but cost is of a relatively high, is made with steel-pipe pile
For the auxiliary of adjacent slope protection pile, it is possible to reduce the density of setting of slope protection pile, so as to further reduce construction costs.Also, steel pipe
The earth-retaining effect of stake is good, and supporting construction can be made to have the more preferably anti-collapse effect of earth-retaining.
Preferably, at least a line prestressed anchor boom end close to ground locks Guan Liang, and prestressed anchor stretches into the soil body
End oblique cutting to pebble layer.
By using above-mentioned technical proposal, prestressed anchor enters the soil body with wide-angle oblique cutting, can make prestressed anchor
Anchoring section enters pebble layer through deep backfill stratum, reliably to anchor；And the other end of prestressed anchor locks Guan Liang,
So that prestressed anchor can energetically, anchoring section and tensioning section coordinate for tensioning in backfill stratum, prestressed anchor can be with
Play the effect of soil body anchoring.
Preferably, the cement mortar filled with solidification in the steel pipe.
By using above-mentioned technical proposal, cement mortar is injected in steel pipe, the power transmission effect of steel pipe in itself can be increased, simultaneously
Steel pipe is set to be connected as a single entity with reinforced concrete pile.
In summary, composite soil nailing wall and pile-anchor retaining are used in combination, wherein, composite soil nailing wall is made full use of in foundation ditch
Carry out appropriate slope using space, so as to reduce the density of the slope protection pile in pile-anchor retaining, reduce construction cost, at the same
An appropriate number of steel-pipe pile is inserted between slope protection pile as auxiliary, pattern foundation pit supporting structure is carried out with the theory of advance support.Meanwhile for
Deep backfill, soil property is soft, in order that pile-anchor retaining can play actual supporting effect with composite soil nailing wall, close to foundation ditch
Guan Liang is locked in the prestressed anchor one end on top, and other end wide-angle oblique cutting enters the boulder bed under backfill stratum, with shape
Acted on into reliable tensioning；Steel pipe is set up between the end of the prestressed anchor of slope section and slope protection pile, with prestressed anchor
Stretching force be transferred in slope protection pile, and the bad slope boss of not return loss.
Brief description of the drawings
Fig. 1 is the composite supporting construction view suitable for backfill sloping timbering；
The A portions zoomed-in view that Fig. 2 does for the end construction of display prestressed anchor；
Fig. 3 is the top view of position relationship between display steel-pipe pile and slope protection pile；
Fig. 4 is the topology view of prestressed anchor and the support system of slope protection pile composition at seven meters of underground；
The B portions zoomed-in view that Fig. 5 does for display channel-section steel with steel pipe position relationship；
Fig. 6 is the topology view of steel pipe；
In figure, 1, ground；11st, back fill course；12nd, pebble layer；2nd, slope protection pile；3rd, steel-pipe pile, 4, composite soil nailing wall；
41st, soil nailing face wall；5th, Guan Liang；6th, soil nailing；7th, prestressed anchor；71st, anchoring section；72nd, tensioning section；73rd, billet；8th, steel pipe；
9th, channel-section steel.
The utility model is described in further detail below in conjunction with accompanying drawing.
A kind of composite soil nailing wall suitable for backfill and pile-anchor retaining composite supporting construction, as shown in figure 1, applied to ground
Foundation pit side-wall under face 1, that there is deep back fill course 11, including steel-pipe pile 3, slope protection pile 2, soil nailing face wall 41, prestressing force
Anchor pole 7.
As shown in figure 3, slope protection pile 2 is reinforced concrete pile, in order to increase the earth-retaining ability of support system, and increase not too much
Add the cost of support system, two steel-pipe piles 3 are inserted between adjacent slope protection pile 2, slope protection pile 2 is collectively forming gear with steel-pipe pile 3
Soil structure.The cost of steel-pipe pile 3 is less than the slope protection pile 2 that reinforced concrete pile is done, and its earth-retaining ability can substantially meet phase
Earth-retaining between adjacent slope protection pile 2 needs.Stake spacing between adjacent slope protection pile 2 is determined by the geological condition fed back during geological prospecting
It is fixed.Meanwhile Guan Liang 5 is done in the top of slope protection pile 2 according to existing stake top, by the slope protection pile 2 of supporting on foundation pit side-wall and
Steel-pipe pile 3 connects into an entirety, prevents vertical side slope top of the slope from deforming.
With reference to Fig. 1, there are embedded slope protection pile 2 and steel-pipe pile 3, steel-pipe pile 3 and steel pipe in ground 1 is arranged below on foundation pit side-wall
The prestressed anchor 7 of inter-pile soil between stake 3, meanwhile, prestressed anchor 7 is along more slope protection piles 2 and the arrangement side of steel-pipe pile 3
To being uniformly distributed.Because the back fill course 11 of the lower section of ground 1 is relatively deep, in order to ensure the anchoring of the prestressed anchor 7 close to ground 1
Power is enough, and the end of prestressed anchor 7 needs guiding through the bottom of back fill course 11, so that the anchoring section 71 of prestressed anchor 7 stretches into
Pebble layer 12 under back fill course 11, therefore, the one of upper end drains into a few row's prestressed anchors 7 passes through backfill with wide-angle
Layer 11, pebble layer 12 of the end anchorage to back fill course below 11, and stretching force is transferred to the soil body from tensioning section.Wherein,
Extending for anchoring section 71, anchoring section 71 to the direction of Guan Liang 5 for the top of pebble layer 12 and the bottom of back fill course 11 is inserted, directly
It is tensioning section 72 to the part of Guan Liang 5 is locked.Meanwhile spacing is smaller between adjacent prestressed anchor 7, prestressed anchor 7 can
To provide enough pulling force, ensure the stability of the slopes of back fill course 11.
With reference to Fig. 1, according to 1 in the seven meters of sections to bottom of foundation ditch below 1 of ground:0.6 gradient carries out slope, and certainly
The domatic soil body interpolation to after domatic enters soil nailing 6, and carries out spraying mixed supporting to domatic, forms soil nailing face wall 41, soil nailing face wall 41
With forming composite soil nailing wall 4, i.e. composite soil nailed wall together with soil nailing 6.
Along the orientation of more slope protection piles 2, soil nailing 6 interleaves distribution with prestressed anchor 7；Along the height side of foundation pit side-wall
To soil nailing 6 also interleaves distribution with prestressed anchor 7.Prestressed anchor is replaced by equivalent to by the part soil nailing 6 in soil nailing face wall 41
Bar 7, while the cost of pure pile-anchor retaining is reduced, retain the support capacity of prestressed anchor 7, make itself and soil nailing 6 one
Rise and form supporting.
With reference to Fig. 2 and Fig. 4, on foundation pit side-wall, the prestressed anchor 7 of the top is locked in Guan Liang 5, and several rows of lower section in advance should
Power anchor pole 7 is lock onto on foundation pit side-wall by one along the horizontally disposed channel-section steel 9 of foundation pit side-wall.Prestressed anchor 7 passes through channel-section steel 9
Bottom wall enter the soil body, between rod end and the bottom land of channel-section steel 9 pad be provided with a billet 73, the end of prestressed anchor 7 passes through steel
Backing plate 73 is compacted to the bottom land of channel-section steel 9, then is compacted to by the outer bottom of channel-section steel 9 on foundation pit side-wall.
In order to prevent prestressed anchor 7 into the soil body during tensioning, the outer bottom of the end of prestressed anchor 7 or channel-section steel 9 will
The slope boss of composite soil nailing wall 4 damages by pressure, and ensures that the stretching force of prestressed anchor 7 can be effectively transferred in slope protection pile 2, base
In the slope section for cheating side wall, more steel pipes 8 are provided between the outer bottom of channel-section steel 9 and slope protection pile 2, steel pipe 8 is uniformly by slope protection pile 2
Support.Meanwhile the casting concrete into steel pipe 8, after concrete final set, composite soil nailing wall 4 is organically combined with slope protection pile 2,
To strengthen the effect of the transmission power between composite soil nailing wall 4 and slope protection pile 2, strengthen supporting effect.
With reference to Fig. 5 and Fig. 6, steel pipe 8 sets arc tips 81, the shape and bank protection of arc tips 81 close to one end of slope protection pile 2
The outer wall shape adaptation of stake 2, so that prestressed anchor 7 can effective stress.In order that 7 effective stress of prestressed anchor and transmitting
Power is not limited to the end of steel pipe 8 making arc tips 81 to slope protection pile 2, can also be directly by the side wall of slope protection pile 2 with air drill
A plane is processed, is reliably contradicted with the end with steel pipe 8.
A kind of construction method of composite support suitable for deep backfill foundation ditch, its step are as follows：
S1：Earth excavation is to operation side absolute altitude, and the foundation depth designed according to initial stage and distance are vertical from ground 1
Drilling downwards, forms some stake holes, according to stake holes diameter banding steel cage, transfers to stake holes, and pours into a mould, and forms reinforced concrete
S2：Regard soil layer situation between adjacent reinforced concrete stake, the at most root steel-pipe pile 3 of insertion one, and to steel-pipe pile 3
Interior injection cement mortar；
S3：Guan Liang 5 is done at the top of the reinforced concrete pile of whole, the top of the slope protection pile 2 of whole is connected as a single entity, is passed through
Cross at steel-pipe pile 3, can be connected with the mode of bar planting；
S4:To inserting soil nailing 6 and prestressed anchor 7 between slope protection pile 2 and steel-pipe pile 3, steel-pipe pile 3 and steel-pipe pile 3,
It is also, close along the arragement direction and top of the slope of slope protection pile 2 to bottom of slope direction, soil nailing 6 and the alternate arrangement of prestressed anchor 7
The prestressed anchor 7 on ground 1 locks Guan Liang 5, and inserts the soil body with wide-angle, ensures that the anchoring section 71 of prestressed anchor 7 stretches into
In pebble layer 12；
S5：In the bearing of prestressed anchor 7, fixed steel pipe 8, at this point it is possible to select to contradict steel pipe 8 to slope protection pile 2
Arc tips 81 are done in end, or process hole in slope protection pile 2 with pneumatic pick, and steel pipe 8 and slope protection pile 2 is tentatively fixed；
S6：One end that the other end and prestressed anchor 7 of steel pipe 8 expose composite soil nailing wall 4 is fixedly connected with channel-section steel 9, and
The end of prestressed anchor 7 is pushed against by channel-section steel 9 by nut and anchor-rod tray, is allowed to possess enough stretching forces；
S7:Slope section it is domatic on, be that fixing point hangs reinforced mesh in the end of soil nailing 6, and gunite concrete, formed
Overall soil nailing face wall 41.
This specific embodiment is only that it is not to limitation of the present utility model, ability to explanation of the present utility model
Field technique personnel can make the modification of no creative contribution to the present embodiment as needed after this specification is read, but
As long as all protected in right of the present utility model by Patent Law.