CN207553108U - Geotechnical engineering safety protective device - Google Patents
Geotechnical engineering safety protective device Download PDFInfo
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- CN207553108U CN207553108U CN201721220796.7U CN201721220796U CN207553108U CN 207553108 U CN207553108 U CN 207553108U CN 201721220796 U CN201721220796 U CN 201721220796U CN 207553108 U CN207553108 U CN 207553108U
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Abstract
The utility model belongs to geotechnical engineering field; more particularly to geotechnical engineering safety protective device; wherein diagonal brace double-row pile is set to the periphery of foundation pit; foundation pit periphery ground opens up drilling; diagonal brace double-row pile is anchored in foundation pit periphery ground by cable bolting through diagonal brace double-row pile by drilling, and bolt-spary supports is set below the rock shoulder portion of foundation pit；Bolt-spary supports includes anchor pole and gunite concrete panel, and the spray of gunite concrete panel is layered on rock shoulder portion hereinafter, being laid with metal mesh on gunite concrete panel and ground contact surface, anchor pole by the embedded rock mass of drilling inside.The beneficial effects of the utility model：The integrated support intensity of diagonal brace double-row pile is big, and it is fixed using cable bolting, ensure the firm of foundation pit supporting construction, frictional force between the anchor pole enhancing joint plane of bolt-spary supports and rock stratum, enhance the stability of sillar or rock stratum, the effect of gunite concrete panel is to reinforce country rock, prevents sillar from removing or falling, support system ensure that the safety of structure and the smooth construction of engineering.
Description
Technical field
The utility model belongs to geotechnical engineering field more particularly to geotechnical engineering safety protective device.
Background technology
With the fast development of China's economy and the acceleration of urbanization process, a large amount of high level, Super High and city
Iron tunnel emerges in large numbers like the mushrooms after rain, and corresponding underground deep-foundation pit engineering also constantly occurs.Deep-foundation pit engineering is set
Meter and construction are a major issues, once it does not handle appropriate, it is possible to cause serious threat.In recent years, about base
The hole earthwork cave in etc. engineering accidents it occur frequently that, bring undesirable influence safely to the people's lives and property.Therefore for depth
Base pit engineering, the supporting for the foundation pit that be prudent in dealing with and its influence problem to ambient enviroment, in the supporting knot of selection deep basal pit
During structure system, safety, basic principle rationally, economic are adhered to.At present, it is more and more with the continuous development of base pit engineering
The pattern foundation pit supporting structure mode of type is applied in Practical Project.For foundation pit supporting system, institute's supporting foundation pit is played
Main function be sealing and earth-retaining.In order to realize good supporting effect, foundation pit supporting system is proposed in engineering various
Different requirements：Effective space can be provided for the construction of the excavation and underground structure of foundation pit；In order to make around foundation pit
The deformations such as construction of structures, urban operating mechanism, road are in allowed band, to improve strength and stability, the control of support system
The deformation of system；Meanwhile under the premise of safe handling requirement is met, can accomplish cost-effective cost, it realizes good
Economic benefit.For the base pit engineering of different hydrogeologic conditions, different surrounding enviroment, corresponding suitable prop is selected
It is the effect to realize earth-retaining and sealing.
For different types of pattern foundation pit supporting structure mode, there are the characteristics of respective and the scope of application, while also have itself
Shortcoming：It constructs for simple slope, in deep foundation pit engineering in urban, since underground installation and the intensive construction of surrounding are built
The presence of object, this mode are difficult to realize；Using diaphram wall, the period of construction is long and cost is high；Using
Inner support supporting construction, excavation of foundation pit is not very convenient, and live construction is relatively difficult, and cost is higher；Using cantilever
Formula supporting construction, the lateral deformation comparison of level of pile body is big, and is capable of the foundation depth of supporting than shallower, for supporting
The stringenter deep-foundation pit engineering of the requirement of malformation, this support pattern just seem helpless.For common anchoring pile
For support pattern, the construction of anchor pole easily surmounts land red-line, and following underground space is utilized and is caused a hidden trouble.
Utility model content
In order to solve the above problem.The utility model provides geotechnical engineering safety protective device.
The technical solution of the utility model：Geotechnical engineering safety protective device, including diagonal brace double-row pile, cable bolting and anchor
Spray supporting, it is characterised in that the diagonal brace double-row pile is set to the periphery of foundation pit, and foundation pit periphery ground opens up drilling, described
The diagonal brace double-row pile is anchored in foundation pit periphery ground, the shotcrete by cable bolting through the diagonal brace double-row pile by drilling
Below the rock shoulder portion of supporting setting foundation pit；
The bolt-spary supports includes anchor pole and gunite concrete panel, and the gunite concrete panel spray is layered on rock shoulder 5
Divide hereinafter, being laid with metal mesh on the gunite concrete panel and ground contact surface, the anchor pole passes through in the embedded rock mass of drilling
Portion.
Further, the diagonal brace double-row pile includes preceding campshed and rear campshed, it is described after campshed height higher than before described
The height of campshed, the front row stake top end are equipped with preceding Guan Liang, and heel row stake top end is equipped with rear Guan Liang, and front row stake top end level is set
The linking beam being connect with rear campshed is equipped with, raker beam is equipped between the front row stake top and heel row stake top, the diagonal brace is double
Arrange the hole of reeving of setting perforation on preceding campshed and rear campshed, the drilling that foundation pit periphery ground opens up and the Kong Lian that reeves
Logical, the cable bolting is through reeve hole and the drilling.
Further, the preceding campshed and the rear campshed are enclosed reinforcing area, set and add in the reinforcing area
Gu the soil body.
Further, the cable bolting includes locking anchorage and anchor cable, and the locking anchorage is arranged on the diagonal brace row
Stake is outer, and the anchor cable is through diagonal brace double-row pile and is anchored in the ground of the foundation pit, and the anchor cable is prestressed anchor Cable Structure,
The anchor cable is made of more underrelaxation steel strand wires, and antirust agent is respectively provided with outside the more underrelaxation steel strand wires.
Further, the anchor cable is divided into free segment and anchoring section, in the free segment and the boundary of the anchoring section
Only slurry sealing device, the free segment part use the smooth casing pipe protection of housing for setting, and the anchoring section uses housing radiation fins
Pipe protects, setting slip casting casing in the smooth casing and the corrugated bushing.
Further, described only slurry sealing device is using hermetic bag, and hermetic bag both ends lashing is on anchor cable, quilt
Slurry-inlet valve there are one should at least being stayed on the slip casting casing of the hermetic bag package.
Further, it is provided with isolation mount between the corrugated bushing and drilling.
Further, the isolation mount spacing 1400-1600mm sets one, and bearing height is not less than 20mm, institute
Isolation mount is stated to be welded with plain bar.
Further, the underrelaxation steel strand wires are 8, and locking anchorage uses porous 8 hole OVM anchorages of clip type.
Further, the pile body horizontal layout of the preceding campshed group and rear campshed group is in lattice or single trigonometric expression.
The beneficial effects of the utility model：The integrated support intensity of diagonal brace double-row pile is big, and is fixed using cable bolting, protects
The firm of foundation pit supporting construction is demonstrate,proved, the frictional force between the anchor pole enhancing joint plane of bolt-spary supports and rock stratum enhances sillar or rock stratum
Stability, the effect of gunite concrete panel is to reinforce country rock, prevents sillar from removing or falling, support system ensure that structure
Safety and engineering smooth construction.
Description of the drawings
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the structure diagram of the diagonal brace double-row pile of the utility model；
Fig. 3 is the structure diagram of the cable bolting of the utility model；
Fig. 4 is the A-A sectional views of Fig. 3；
Fig. 5 is the B-B sectional views of Fig. 3；
Fig. 6 is that the utility model is in lattice layout drawing；
Fig. 7 is that the utility model is in single trigonometric expression layout drawing.
In figure, 1. diagonal brace double-row piles, 2. cable boltings, 3. bolt-spary supports, 4. foundation pits, 5. rock shoulders, 6. anchor poles, 7. injections
Guan Liang, 12. linking beams, 13. raker beams, 14. are reeved behind Guan Liang, 11. before campshed, 10. behind campshed, 9. before concrete slab, 8.
Only slurry sealing fills for hole, 15. drillings, 16. soil mass consolidations, 17. locking anchorages, 18. anchor cables, 19. free segments, 20. anchoring sections, 21.
Put, 22. smooth casings, 23. corrugated bushings, 24. steel strand wires, 25. slip casting casings, 26. isolation mounts.
Specific embodiment
It explains below in conjunction with the accompanying drawings to a kind of specific embodiment of the utility model.
The utility model is related to geotechnical engineering safety protective devices.
Geotechnical engineering safety protective device, including diagonal brace double-row pile 1, cable bolting 2 and bolt-spary supports 3, diagonal brace double-row pile
The periphery of foundation pit 4 is set to, the geotechnical structure of 4 periphery of foundation pit is used to support, ensures that foundation pit consolidates.The peripheral ground of foundation pit 4 opens up
Drilling 15, drilling 15 are used for the installation of cable bolting, and cable bolting 2 is through diagonal brace double-row pile by drilling the double piled anchor of diagonal brace
It is fixed on the peripheral ground of foundation pit 4, is used to support diagonal brace double-row pile 1, booster action is played to supporting construction, increases supporting construction
Firm, bolt-spary supports 3 is set below 5 part of rock shoulder of foundation pit；The integrated support intensity of diagonal brace double-row pile 1 is big, and using anchor cable
Supporting 2 is fixed, and ensures the firm of 4 supporting construction of foundation pit, and the anchor pole of bolt-spary supports 3 enhances the frictional force between joint plane and rock stratum,
Enhance the stability of sillar or rock stratum, the effect of gunite concrete panel is to reinforce country rock, prevents sillar from removing or falling, supporting
System ensure that the safety of structure and the smooth construction of engineering.
Foundation pit 4 is constructed using intermediate kerve, and two sides, which are stayed, sets the 1m rocks platform back of the body, phased separation after intermediate foundation pit is bottomed, base
Bolt-spary supports 3 is done below 5 part of rock shoulder in hole.Bolt-spary supports 3 includes anchor pole 6 and gunite concrete panel 7, gunite concrete face
The spray of plate 7 is layered on 5 part of rock shoulder hereinafter, being laid with metal mesh on gunite concrete panel 7 and ground contact surface, 5 part of rock shoulder with
Lower bolt 6 is embedded in by drilling inside rock mass, and the anchor pole 6 of bolt-spary supports 3 enhances the frictional force between joint plane and rock stratum, enhances rock
Block or the stability of rock stratum, the effect in gunite concrete face 7 are to reinforce country rock, and metal mesh prevents sillar from removing or falling.
Diagonal brace double-row pile 1 includes preceding campshed 8 and rear campshed 9, and rear campshed 9 is disposed far from 4 periphery of foundation pit of margin of foundation pit
In geotechnical structure, rear campshed 9 need to enter rock 2m, carry out inner support, it is ensured that design brace pre axial force.Preceding campshed 8 is provided close to 4 side of foundation pit
The position of edge, preceding campshed 8 and rear campshed 9 are deposited reinforced concrete pile, and the height of rear campshed 9 is higher than the height of preceding campshed 9, preceding
8 top of campshed is equipped with preceding Guan Liang 10, and rear 9 top of campshed is equipped with rear Guan Liang 11, and preceding 8 top of campshed has been horizontally disposed with and rear campshed 9
The linking beam 12 of connection is equipped with raker beam 13, the preceding campshed 8 of diagonal brace double-row pile 1 between 9 stake top of preceding 8 stake top of campshed and rear campshed
The drilling 15 opened up with the hole 14 of reeving of setting perforation on rear campshed 9, the peripheral ground of foundation pit 4 and 14 unicom of hole of reeving are in always
Line, cable bolting 2 can increase the rigidity of diagonal brace double-row pile cantilever segment, reduce stake top position through reeve hole 14 and the drilling 15
It moves, while the reliability that stake is connect with Guan Liang can also be improved, campshed becomes bending component before making, and campshed is held by curved before improving
Carry power.Reeve hole 14 use DNl60 steel pipe indwellings, thickness of steel pipe 5mm, column beam muscle should bypass steel pipe, such as to cut off to increase and help
Dowel.It is stayed on wall simultaneously and sets PVC-U, DN200 drain holes.Notice that unwrapping wire positioning strictly controls position of boxing out during construction
And angle.
The front-seat pile body group formed around the preceding campshed 8 of foundation pit setting, the heel row formed around the rear campshed 9 of foundation pit setting
Pile body group, front-seat pile body combine the reinforcing area formed between heel row pile body group, set soil mass consolidation 16 in reinforcing area, increase
The integrated support intensity of strong double-row pile ensures the firm of foundation pit supporting construction, prevents the landslide of foundation pit, eliminates safe hidden trouble etc. and to ask
Topic.
Cable bolting includes locking anchorage 17 and anchor cable 18, and locking anchorage 17 is arranged on outside diagonal brace campshed 1, and anchor cable 18 runs through
Diagonal brace double-row pile 1 is simultaneously anchored in the ground of foundation pit 4, and anchor cable 18 is prestressed anchor Cable Structure, is needed at tensioning and locking construction
Reason, tensioning are carried out in anchoring section intensity more than 15MPa is not less than design strength grade 75%, in order to reduce neighbouring anchor cable
Stress influence, and construction speed is not influenced, using " jumping a method ", i.e., the method for drawing 1 every 2.Before formal tensioning, design pulling force should be taken
The 20% of Nt takes 160KN to carry out pre- tensioning 2 times to anchor cable, makes that each location contacts are close, and anchor cable is close with soil layer, at the beginning of generating
It cuts.Hierarchical loading cycle is taken in formal tensioning, stablizes 3min after every grade of loading, when being stretched to 880KN and holds lotus 5min without change
After change, it is offloaded to locking load 500KN and carries out locking operation.Anchor cable 18 is made of more underrelaxation steel strand wires 24, and steel strand wires are strong
Spend standard value fptk=1860mpa, the design withdrawal resistance of single anchor cable 18 is 800kN, the design anchor force 50kN/m of anchored end,
Intensity is big, and antirust agent is respectively provided with outside more underrelaxation steel strand wires, plays the role of greasy dirt, derusting.
Anchor cable 18 divides for free segment 19 and anchoring section 20, in the boundary of free segment 19 and anchoring section 20 setting only slurry sealing
Device 21, and with good sealing performance, convenient for controlling segmenting slip casting, 19 part of free segment is anti-using the smooth casing 22 of housing
Shield, anchoring, 20 are protected using housing corrugated bushing 23, and setting slip casting casing 25, convenient in smooth casing 22 and corrugated bushing 23
In 20 slip casting of free segment and 19 anchoring section, it is easy to accomplish, slip casting is evenly distributed.
Only slurry sealing device 21 is using hermetic bag, and has good sealing performance, and 21 both ends lashing of hermetic bag exists
It is easily operated on anchor cable, it should be at least stayed on slip casting casing 25 that hermetic bag 21 is wrapped up there are one slurry-inlet valve, control is facilitated to note
Slurry.
Isolation mount 26 is provided between corrugated bushing 23 and drilling 15, slip casting set is also provided between corrugated bushing 23 and drilling 15
Pipe, convenient for controlling slip casting, isolation mount 26 ensures corrugated bushing 25 and the relative position of drilling 15 after slip casting.
26 spacing 1400-1600mm of isolation mount sets one, and bearing height not less than 20mm, ensures ripple after slip casting
Casing 25 and the relative position of drilling 15, isolation mount 26 is welded with plain bar, simple in structure, is readily produced realization.
Underrelaxation steel strand wires 24 are 8, and intensity is secured greatly, and locking anchorage 17 uses porous 8 hole OVM anchorages of clip type, side
Just underrelaxation steel strand wires are fixed, post-tensioning component thickness can be thinned using it, overcome group anchor system lower prestress and excessively concentrate.
The pile body horizontal layout of preceding campshed group and rear campshed group is easy to construct, overally support in lattice or single trigonometric expression
Intensity is big.
Specific construction process:
1) diagonal brace double-row pile 1 need to enter rock 2m, carry out inner support, it is ensured that design brace pre axial force.
2) anchor cable construction mainly comprises the following steps and sets up operating platform drilling machine is in place one by one, adjusts the angle and drill Suo Kongyi one by one
One high-pressure blast washes hole of reeving, and anchor cable prepares and assembles anchor cable one by one one by one and Grouting Pipe is placed slip casting one by one and conserved one by one and opens one by one
It draws and locks.
It is as follows：
(A) operating platform is set up：Prestress anchorage cable and backfill follow-up construction operation, since retaining wall has been constructed in advance
Finish, anchor cable construction should set up operating platform to ensure drilling machine operation in place.Operating platform is set up along elongated on the outside of retaining wall, width
3m, work layer completely spread 50 solid woods, and job platform, which leads to anchor cable construction progress, gradually to be increased.
(B) drilling machine is in place and adjusts the angle：MD-50 type drilling machines is selected to drill, adjustment drilling rod and level side before drilling
To into 20 degree of angles, slowly it is inserted into the rock-soil layer at the barricade back side by campshed (column) wall preformed hole.
(C) rope hole is drilled：Boring aperture 150mm, it is desirable that anchor pole hole depth is no less than design length, does not also set preferably greater than
Count the 1% of length.Foot of hole deflection size is not more than the 3% of length, can control drilling side with clinograph
To.
(D) anchor cable is prepared and is assembled：Prestress anchorage cable is made of 8 underrelaxation steel strand wires, steel strand wires strength standard value
Fptk=1860mpa, the design withdrawal resistance of single anchor cable is 800kN, the design anchor force 50kN/m of anchored end.To steel before making
Twisted wire carries out witness sampling experiment, and carries out visual examination, could be used after qualified.Steel strand wires should degrease, derust, and strictly press
Design size blocks blanking, and per share error in length is not more than 50mm.Overall length uses F-236 type antirust agent brushings.
Anchor cable 18 divides for free segment 19 and anchoring section 20, in the boundary of free segment 19 and anchoring section 20 setting only slurry sealing
Device 21, and with good sealing performance, convenient for controlling segmenting slip casting, 19 part of free segment is anti-using the smooth casing 22 of housing
Shield, anchoring, 20 are protected using housing corrugated bushing 23, setting slip casting casing 25, slip casting in smooth casing 22 and corrugated bushing 23
It is evenly distributed afterwards in free segment and 19 anchoring sections 20.It should at least be stayed that there are one into slurry on slip casting casing 25 that hermetic bag 21 is wrapped up
Valve facilitates control slip casting.
(E) placement of anchor cable 18 and Grouting Pipe：Anchor cable 18 with high-pressure blast washes drilling before placing, and hack, eliminating impurities are done
Only, anchor cable 18 is directed at drill center, is slowly inserted into design position.
(F) with secondary grouting, a common pressure grouting, secondary high-pressure slip-casting.Anchoring section 20 is first noted during slip casting, treats slurries initial set
Reach and tensioning is carried out to anchoring section 20 after design strength, then slip casting free segment 19 again, make anchoring section 20 and 19 boundary of free segment
Clearly.
(G) tensioning and locking：Tensioning is carried out using mating jack YcQ-100, and tensioning equipment is tried before tensioning
It tests and demarcates；It is pulled in anchoring section intensity to carry out more than 15MPa is not less than design strength grade 75%, in order to reduce neighbouring anchor
The stress influence of rope, and construction speed is not influenced, using " jumping a method ", i.e., the method for drawing 1 every 2.Before formal tensioning, design should be taken
The 20% of pulling force Nt takes 160KN to carry out pre- tensioning 2 times to anchor cable, makes that each location contacts are close, and anchor cable is close with soil layer, generation
Preliminary shearing.Hierarchical loading circulation stretch-draw is taken in formal tensioning, stablizes 3min after every grade of loading, when being stretched to 880KN and holds lotus 5min
After unchanged, it is offloaded to locking load 500KN and carries out locking operation.
3) foundation pit 4 is constructed using intermediate kerve, and two sides, which are stayed, sets the lm rocks platform back of the body.
4) phased separation after intermediate foundation pit 4 is bottomed, nearby rock must not use Blasting Excavation at stake bottom, ensure stake bed rock stone not
It is disturbed, rock mass sets anchor pole 6 (diameter 25mm anchor poles, aperture 120mm, L=5m, quincuncial arrangement) and carries out shotcrete under stake
Supporting 3；
5) excavation of foundation pit and agent structure perform segmentation and carry out, and per 6~lOm of segment length, circular construction joint is arranged on 1/4
At~1/3 girder span.
6) since fender post bottom is without fixed end constraint, integral stability of foundation pit can not judge, need to strengthen monitoring (ground, stake
Body, bracing members etc.), and emergency preplan is carried out, once exception occur in monitoring data, should adopt an effective measure at once.
Embodiment 1
Geotechnical engineering safety protective device, including diagonal brace double-row pile 1, cable bolting 2 and bolt-spary supports 3, diagonal brace double-row pile
The periphery of foundation pit 4 is set to, the geotechnical structure of 4 periphery of foundation pit is used to support, ensures that foundation pit consolidates.The peripheral ground of foundation pit 4 opens up
Drilling 15, drilling 15 are used for the installation of cable bolting, and cable bolting 2 is through diagonal brace double-row pile by drilling the double piled anchor of diagonal brace
It is fixed on the peripheral ground of foundation pit 4, is used to support diagonal brace double-row pile 1, booster action is played to supporting construction, increases supporting construction
Firm, bolt-spary supports 3 is set below 5 part of rock shoulder of foundation pit；The integrated support intensity of diagonal brace double-row pile 1 is big, and using anchor cable
Supporting 2 is fixed, and ensures the firm of 4 supporting construction of foundation pit, and the anchor pole of bolt-spary supports 3 enhances the frictional force between joint plane and rock stratum,
Enhance the stability of sillar or rock stratum, the effect of gunite concrete panel is to reinforce country rock, prevents sillar from removing or falling, supporting
System ensure that the safety of structure and the smooth construction of engineering.
Foundation pit 4 is constructed using intermediate kerve, and two sides, which are stayed, sets the 1m rocks platform back of the body, phased separation after intermediate foundation pit is bottomed, base
Bolt-spary supports 3 is done below 5 part of rock shoulder in hole.Bolt-spary supports 3 includes anchor pole 6 and gunite concrete panel 7, gunite concrete face
The spray of plate 7 is layered on 5 part of rock shoulder hereinafter, being laid with metal mesh on gunite concrete panel 7 and ground contact surface, anchor pole 6 passes through drilling
Inside embedded rock mass, the anchor pole 6 of bolt-spary supports 3 enhances the frictional force between joint plane and rock stratum, enhances the stabilization of sillar or rock stratum
Property, the effect in gunite concrete face 7 is to reinforce country rock, and metal mesh prevents sillar from removing or falling.
Diagonal brace double-row pile 1 includes preceding campshed 8 and rear campshed 9, and rear campshed 9 is disposed far from 4 periphery of foundation pit of margin of foundation pit
In geotechnical structure, rear campshed 9 needs people rock 2m, carries out inner support, it is ensured that design brace pre axial force.Preceding campshed 8 is provided close to 4 side of foundation pit
The position of edge, preceding campshed 8 and rear campshed 9 are deposited reinforced concrete pile, and the height of rear campshed 9 is higher than the height of preceding campshed 9, preceding
8 top of campshed is equipped with preceding Guan Liang 10, and rear 9 top of campshed is equipped with rear Guan Liang 11, and preceding 8 top of campshed has been horizontally disposed with and rear campshed 9
The linking beam 12 of connection is equipped with raker beam 13, the preceding campshed 8 of diagonal brace double-row pile 1 between 9 stake top of preceding 8 stake top of campshed and rear campshed
The drilling 15 opened up with the hole 14 of reeving of setting perforation on rear campshed 9, the peripheral ground of foundation pit 4 and 14 unicom of hole of reeving, anchor cable branch
Shield 2 can increase the rigidity of diagonal brace double-row pile cantilever segment, reduce displacement at pile top, simultaneously also through reeve hole 14 and the drilling 15
The reliability that stake is connect with Guan Liang can be improved, campshed becomes bending component before making, the bend-carrying capacity of campshed before improving.It reeves
Hole 14 uses DNl60 steel pipe indwellings, thickness of steel pipe 5mm, and column beam muscle should bypass steel pipe, such as cut off to increase and help dowel.Simultaneously
It is stayed on wall and sets PVC-U, DN200 drain holes.Notice that unwrapping wire positioning strictly controls box out position and angle during construction.
The front-seat pile body group formed around the preceding campshed 8 of foundation pit setting, the heel row formed around the rear campshed 9 of foundation pit setting
Pile body group, front-seat pile body combine the reinforcing area formed between heel row pile body group, set soil mass consolidation 16 in reinforcing area, increase
The integrated support intensity of strong double-row pile ensures the firm of foundation pit supporting construction, prevents the landslide of foundation pit, eliminates safe hidden trouble etc. and to ask
Topic.
The pile body horizontal layout of preceding campshed group and rear campshed group is easy to construct, overally support in lattice or single trigonometric expression
Intensity is big.
Embodiment 2
Geotechnical engineering safety protective device, including diagonal brace double-row pile 1, cable bolting 2 and bolt-spary supports 3, diagonal brace double-row pile
The periphery of foundation pit 4 is set to, the geotechnical structure of 4 periphery of foundation pit is used to support, ensures that foundation pit consolidates.The peripheral ground of foundation pit 4 opens up
Drilling 15, drilling 15 are used for the installation of cable bolting, and cable bolting 2 is through diagonal brace double-row pile by drilling the double piled anchor of diagonal brace
It is fixed on the peripheral ground of foundation pit 4, is used to support diagonal brace double-row pile 1, booster action is played to supporting construction, increases supporting construction
Firm, bolt-spary supports 3 is set below 5 part of rock shoulder of foundation pit；The integrated support intensity of diagonal brace double-row pile 1 is big, and using anchor cable
Supporting 2 is fixed, and ensures the firm of 4 supporting construction of foundation pit, and the anchor pole of bolt-spary supports 3 enhances the frictional force between joint plane and rock stratum,
Enhance the stability of sillar or rock stratum, the effect of gunite concrete panel is to reinforce country rock, prevents sillar from removing or falling, supporting
System ensure that the safety of structure and the smooth construction of engineering.
Foundation pit 4 is constructed using intermediate kerve, and two sides, which are stayed, sets the 1m rocks platform back of the body, phased separation after intermediate foundation pit is bottomed, base
Bolt-spary supports 3 is done below 5 part of rock shoulder in hole.Bolt-spary supports 3 includes anchor pole 6 and gunite concrete panel 7, gunite concrete face
The spray of plate 7 is layered on 5 part of rock shoulder hereinafter, being laid with metal mesh on gunite concrete panel 7 and ground contact surface, anchor pole 6 passes through drilling
Inside embedded rock mass, the anchor pole 6 of bolt-spary supports 3 enhances the frictional force between joint plane and rock stratum, enhances the stabilization of sillar or rock stratum
Property, the effect in gunite concrete face 7 is to reinforce country rock, and metal mesh prevents sillar from removing or falling.
Diagonal brace double-row pile 1 includes preceding campshed 8 and rear campshed 9, and rear campshed 9 is disposed far from 4 periphery of foundation pit of margin of foundation pit
In geotechnical structure, rear campshed 9 needs people rock 2m, carries out inner support, it is ensured that design brace pre axial force.Preceding campshed 8 is provided close to 4 side of foundation pit
The position of edge, preceding campshed 8 and rear campshed 9 are deposited reinforced concrete pile, and the height of rear campshed 9 is higher than the height of preceding campshed 9, preceding
8 top of campshed is equipped with preceding Guan Liang 10, and rear 9 top of campshed is equipped with rear Guan Liang 11, and preceding 8 top of campshed has been horizontally disposed with and rear campshed 9
The linking beam 12 of connection is equipped with raker beam 13, the preceding campshed 8 of diagonal brace double-row pile 1 between 9 stake top of preceding 8 stake top of campshed and rear campshed
The drilling 15 opened up with the hole 14 of reeving of setting perforation on rear campshed 9, the peripheral ground of foundation pit 4 and 14 unicom of hole of reeving, anchor cable branch
Shield 2 can increase the rigidity of diagonal brace double-row pile cantilever segment, reduce displacement at pile top, simultaneously also through reeve hole 14 and the drilling 15
The reliability that stake is connect with Guan Liang can be improved, campshed becomes bending component before making, the bend-carrying capacity of campshed before improving.It reeves
Hole 14 uses DNl60 steel pipe indwellings, thickness of steel pipe 5mm, and column beam muscle should bypass steel pipe, such as cut off to increase and help dowel.Simultaneously
It is stayed on wall and sets PVC-U, DN200 drain holes.Notice that unwrapping wire positioning strictly controls box out position and angle during construction.
Cable bolting includes locking anchorage 17 and anchor cable 18, and locking anchorage 17 is arranged on outside diagonal brace campshed 1, and anchor cable 18 runs through
Diagonal brace double-row pile 1 is simultaneously anchored in the ground of foundation pit 4, and anchor cable 18 is prestressed anchor Cable Structure, and tensioning is more than in anchoring section intensity
What 15MPa was not less than design strength grade 75% carries out, in order to reduce the stress influence of neighbouring anchor cable, and do not influence to construct into
Degree, using " jumping a method ", i.e., the method for drawing 1 every 2.Before formal tensioning, the 20% of design pulling force Nt should be taken to take 160KN to anchor
The pre- tensioning of Suo Jinhang 2 times, makes that each location contacts are close, and anchor cable is close with soil layer, generates preliminary shearing.Hierarchical loading is taken in formal tensioning
Cycle stablizes 3min after every grade of loading, when being stretched to 880KN and hold lotus 5min it is unchanged after, be offloaded to locking load 500KN
Carry out locking operation.Anchor cable 18 is made of more underrelaxation steel strand wires 24, steel strand wires strength standard value fptk=1860mpa, single
The design withdrawal resistance of root anchor cable 18 is 800kN, and the design anchor force 50kN/m of anchored end, intensity is big, more underrelaxation steel strand wires
Antirust agent is respectively provided with outside, plays the role of greasy dirt, derusting.
Anchor cable 18 divides for free segment 19 and anchoring section 20, in the boundary of free segment 19 and anchoring section 20 setting only slurry sealing
Device 21, and with good sealing performance, convenient for controlling segmenting slip casting, 19 part of free segment is anti-using the smooth casing 22 of housing
Shield, anchoring, 20 are protected using housing corrugated bushing 23, setting slip casting casing 25, slip casting in smooth casing 22 and corrugated bushing 23
It is evenly distributed afterwards in free segment and 19 anchoring sections 20.
Only slurry sealing device 21 is using hermetic bag, and has good sealing performance, and 21 both ends lashing of hermetic bag exists
It on anchor cable, should at least be stayed that there are one slurry-inlet valves on slip casting casing 25 that hermetic bag 21 is wrapped up, facilitate control slip casting.
Isolation mount 26 is provided between corrugated bushing 23 and drilling 15, slip casting set is also provided between corrugated bushing 23 and drilling 15
Pipe, convenient for controlling slip casting, isolation mount 26 ensures corrugated bushing 25 and the relative position of drilling 15 after slip casting.
26 spacing 1400-1600mm of isolation mount sets one, and bearing height not less than 20mm, ensures ripple after slip casting
Casing 25 and the relative position of drilling 15, isolation mount 26 is welded with plain bar, simple in structure, is readily produced realization.
Underrelaxation steel strand wires 24 are 8, and locking anchorage 17 uses porous 8 hole OVM anchorages of clip type, facilitates fixed underrelaxation
Steel strand wires can be thinned post-tensioning component thickness using it, overcome group anchor system lower prestress and excessively concentrate.
Compared with prior art, the integrated support intensity of diagonal brace double-row pile is big, and is fixed using cable bolting, ensures foundation pit
Firm, the frictional force between the anchor pole enhancing joint plane of bolt-spary supports and rock stratum of supporting construction enhances the stabilization of sillar or rock stratum
Property, the effect of gunite concrete panel is to reinforce country rock, prevents sillar from removing or falling, and support system ensure that the safety of structure
With the smooth construction of engineering.
An example of the utility model is described in detail above, but content is only the preferable reality of the utility model
Apply example, it is impossible to be construed as limiting the scope of the utility model.Equalization made according to the scope of application of this utility model
Variation and improvement etc., should all still belong within the patent covering scope of the utility model.
Claims (10)
1. geotechnical engineering safety protective device, including diagonal brace double-row pile, cable bolting and bolt-spary supports, it is characterised in that described oblique
Support double-row pile is set to the periphery of foundation pit, and foundation pit periphery ground opens up drilling, and the cable bolting is double through the diagonal brace
The diagonal brace double-row pile is anchored in foundation pit periphery ground, the rock shoulder portion of the bolt-spary supports setting foundation pit by campshed by drilling
Below；
The bolt-spary supports includes anchor pole and gunite concrete panel, gunite concrete panel spray be layered on rock shoulder portion with
Under, metal mesh is laid on the gunite concrete panel and ground contact surface, passes through drilling in rock shoulder portion anchor pole as described below
Inside embedded rock mass.
2. geotechnical engineering safety protective device according to claim 1, it is characterised in that before the diagonal brace double-row pile includes
Campshed and rear campshed, the height of the rear campshed are higher than the height of the preceding campshed, and the front row stake top end is equipped with preceding Guan Liang, after
Campshed top is equipped with rear Guan Liang, and the front row stake top end is horizontally disposed with the linking beam being connect with rear campshed, the preceding campshed stake
Raker beam is equipped between top and heel row stake top, perforation is set on the preceding campshed of the diagonal brace double-row pile and the rear campshed
Hole of reeving, drilling that foundation pit periphery ground opens up and the hole unicom of reeving, the cable bolting are reeved through described
Hole and drilling.
3. geotechnical engineering safety protective device according to claim 2, it is characterised in that around multiple institutes of foundation pit setting
The front-seat pile body group of campshed composition before stating, around the heel row pile body group of multiple rear campshed compositions of foundation pit setting, preceding campshed
The reinforcing area formed between body combination heel row pile body group, the interior setting soil mass consolidation of reinforcing area.
4. geotechnical engineering safety protective device according to claim 1 or 2, it is characterised in that the cable bolting includes lock
Determine anchorage and anchor cable, the locking anchorage is arranged on outside the diagonal brace campshed, and the anchor cable is through diagonal brace double-row pile and is anchored in
In the ground of the foundation pit, the anchor cable is prestressed anchor Cable Structure, is made of more underrelaxation steel strand wires, the more low pines
Antirust agent is respectively provided with outside relaxation steel strand wires.
5. geotechnical engineering safety protective device according to claim 4, it is characterised in that the anchor cable be divided into free segment and
Anchoring section, in the setting of the boundary of the free segment and the anchoring section, only slurry sealing device, the free segment part use outer
Smooth casing pipe protection is covered, the anchoring section is protected using housing corrugated bushing, is set in the smooth casing and the corrugated bushing
Put slip casting casing.
6. geotechnical engineering safety protective device according to claim 5, it is characterised in that the only slurry sealing device uses
Hermetic bag, hermetic bag both ends lashing, at least should be there are on the slip casting casing that is wrapped up by the hermetic bag on anchor cable
One slurry-inlet valve.
7. geotechnical engineering safety protective device according to claim 5 or 6, it is characterised in that the corrugated bushing and drilling
Between be provided with isolation mount.
8. geotechnical engineering safety protective device according to claim 7, it is characterised in that the isolation mount spacing 1400
~1600mm sets one, and not less than 20mm, the isolation mount is welded bearing height with plain bar.
9. geotechnical engineering safety protective device according to claim 8, it is characterised in that the underrelaxation steel strand wires are 8
Root, locking anchorage use porous 8 hole OVM anchorages of clip type.
10. geotechnical engineering safety protective device according to claim 3, it is characterised in that the preceding campshed group and rear campshed
The pile body horizontal layout of group is in lattice or single trigonometric expression.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721220796.7U CN207553108U (en) | 2017-09-22 | 2017-09-22 | Geotechnical engineering safety protective device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721220796.7U CN207553108U (en) | 2017-09-22 | 2017-09-22 | Geotechnical engineering safety protective device |
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| CN207553108U true CN207553108U (en) | 2018-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942368A (en) * | 2021-02-03 | 2021-06-11 | 浙江文华建设项目管理有限公司 | Deep foundation pit construction method with side wall supporting function |
-
2017
- 2017-09-22 CN CN201721220796.7U patent/CN207553108U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942368A (en) * | 2021-02-03 | 2021-06-11 | 浙江文华建设项目管理有限公司 | Deep foundation pit construction method with side wall supporting function |
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