CN105780779A - Externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure and use method thereof - Google Patents
Externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure and use method thereof Download PDFInfo
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- CN105780779A CN105780779A CN201410824526.1A CN201410824526A CN105780779A CN 105780779 A CN105780779 A CN 105780779A CN 201410824526 A CN201410824526 A CN 201410824526A CN 105780779 A CN105780779 A CN 105780779A
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Abstract
The invention relates to the field of pipeline laying on land or underground, in particular to an externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure and a use method thereof. The externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure comprises a top pipe (1) arranged in a foundation pit (10), and is characterized by further comprising Larsen piles (2), circuit purlins (3), connectors (4) and inner supporting pipes (5); all the Larsen piles (2) are vertically arranged in the foundation pit (10); and the circuit purlins (3) are horizontally arranged in the foundation pit (10). The use method of the externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure is characterized by comprising the following steps of inserting of the Larsen piles (2), compacting and grouting, soil blocked excavation, construction of the top pipe (1) and soil backfilling. The externally arranged, compacted and grouted Larsen steel sheet pile composite retaining structure is high in tensile strength, bending resistance, and environment adaptability.
Description
Technical field
The present invention relates on land or provided underground pipeline field, be specially Larsen steel sheet pile composite supporting construction and the using method thereof of a kind of peripheral hardware compaction grouting.
Background technology
The foundation ditch that municipal administration pipe-jacking project relates to mostly is to be needed to arrange the deep basal pit that periphery is safeguarded, in the past, newly-built road is positioned at the rimland of pipe-jacking project construction area and mostly is open field, and the requirement of foundation pit deformation is less strict, therefore main body section adopts the method putting slope excavation to implement earth excavation substantially.But in recent years, due to the shortening of duration of going into operation, building such as the supporting transformer station near major project often constructs in advance, just cannot continue in this case to adopt the mode putting slope excavation to arrange foundation ditch；And if adopt the simple method that cement mixing pile is set, owing to cement mixing pile tensile strength is low, it is necessary to there is certain width could meet requirement of strength, it is excessive and cannot be applied to narrow space that this results in width；If adopting the method that single cast-in-place concrete pile excavates in conjunction with subregion, due to top concrete, to be preced with beam bending resistance more weak, and excavation in zones is smaller, affects the construction period and even cannot construct because subregion is too little；According to the single bored concrete pile method in conjunction with suspension roof support, anchor pole is prone to collide with the basis of building on limit, and construction cost is huge.
Summary of the invention
In order to overcome the defect of prior art, it is provided that a kind of have higher tensile strength and bending resistance and the strong supporting construction of environment-adapting ability, the invention discloses the Larsen steel sheet pile composite supporting construction of a kind of peripheral hardware compaction grouting and using method thereof.
The present invention reaches goal of the invention by following technical solution:
The Larsen steel sheet pile composite supporting construction of a kind of peripheral hardware compaction grouting, including the push pipe being located in foundation ditch, is characterized in that: also includes Larsen stake, enclose purlin, connector and interior stay tube,
Each Larsen stake is all vertically located in foundation ditch, and the bottom of Larsen stake is inserted in the bottom surface of foundation ditch, and Larsen stake sets gradually around each medial wall of foundation ditch, fits in a side of Larsen stake and the medial wall of foundation ditch；
Enclose purlin and be horizontally arranged in foundation ditch, each medial wall of foundation ditch is hierarchically provided with at least two rhizosphere purlins from top to bottom, the purlin that encloses being positioned at same layer on each medial wall of foundation ditch is all located in same level, and be positioned in same level enclose purlin by connector end to end successively, every rhizosphere purlin is all fixed with each Larsen stake being located on the same medial wall of foundation ditch, and the two ends of interior stay tube are respectively held against and are fixed on and are oppositely arranged and are positioned on two rhizosphere purlins in same level；
Concrete perfusion in foundation ditch, push pipe is flatly from being poured in the concrete in foundation ditch and passing；
Inspection shaft is built at the middle part of foundation ditch concrete layer by laying bricks or stones.
The Larsen steel sheet pile composite supporting construction of described peripheral hardware compaction grouting, it is characterized in that: connector includes right-angle connector and oblique connecting rod, two right-angle sides of right-angle connector post and fix respectively on two adjacent rhizosphere purlins, and the two ends of oblique connecting rod are respectively held against and are fixed on two adjacent rhizosphere purlins.
The using method of the Larsen steel sheet pile composite supporting construction of described peripheral hardware compaction grouting, implements as follows successively:
Width and the building-in depth of composite supporting construction is determined, to ensure the monolithic stability of foundation ditch according to on-site actual situations；
Being inserted perpendicularly into Larsen stake by root in foundation ditch, the bottom of Larsen stake is inserted in the bottom surface of foundation ditch, and Larsen stake sets gradually around each medial wall of foundation ditch, fits in a side of Larsen stake and the medial wall of foundation ditch；
Densification slip casting bottom foundation ditch；
Earthwork subregion excavation, purlin and interior stay tube are enclosed in the installation that interts during excavation, it is horizontally disposed with encloses purlin by root in foundation ditch, each medial wall of foundation ditch is hierarchically provided with at least two rhizosphere purlins from top to bottom, the purlin that encloses being positioned at same layer on each medial wall of foundation ditch is all located in same level, and be positioned in same level to enclose purlin end to end successively by connector, every rhizosphere purlin is all fixed with each Larsen stake being located on the same medial wall of foundation ditch；The two ends making interior stay tube are respectively held against and are fixed on and are oppositely arranged and are positioned on two rhizosphere purlins in same level；
During subregion excavation, initial absolute altitude is present situation ground elevation, and first time is excavated to the support absolute altitude on upper strata, and that installs upper strata after having excavated encloses purlin and interior stay tube；Upper strata enclose purlin and interior stay tube install after continue to be excavated to the support absolute altitude of lower floor, that installs lower floor after having excavated encloses purlin and interior stay tube；Lower floor enclose purlin and interior stay tube install after continue to be excavated to the top of absolute altitude at the bottom of the base plate being located at bottom foundation ditch, remaining soil labor cleaning；
Jacking construction, even if push pipe is flatly from being poured in the concrete in foundation ditch and passing；
Inspection shaft is built by laying bricks or stones at the middle part of foundation ditch；
Extract Larsen stake and backfill the earthwork.
The present invention by arranging Larsen stake in surrounding, within the scope of the certain depth of base plate compaction grouting, inside arrange enclose purlin and interior stay tube, then pass through stage excavation method and realize the safe excavation of foundation ditch, solve that Larsen stake intensity is too low, the undesirable problem such as be easily damaged of stagnant water effect, the present invention uses in conjunction with earthwork layer excavation method, can receive obvious economic benefit.
The cardinal principle of the present invention is as follows: Larsen stake plays skeleton function in whole supporting construction, can effectively ensure that the sealing performance of supporting construction in conjunction with the sealing effect of compaction grouting；The implementation process of supporting construction is taked the mode of stage excavation and supporting, accomplishes that excavation supporting synchronization implementation is to ensure the stability of foundation ditch.
Premise of the invention process is to adopt Larsen stake support theory to carry out monolithic stability calculating, because arranging peripheral compaction grouting simply improve tensile strength and the sealing performance of supporting construction, and the monolithic stability situation of composite supporting construction can not be changed, only monolithic stability situation meet require after could adopt the present invention.After the requirement of monolithic stability is met, ensure that the resistant slide of composite supporting construction and antidumping are stable by stage excavation；Excavation of foundation pit operating mode related content is calculated, it is determined that the stage excavation degree of depth by excavation equipment and field conditions.
The invention has the beneficial effects as follows:
1. compare with cement mixing pile:
Necessarily causing that width strengthens owing to the tensile strength of pure mixing pile is relatively low, this makes the cement mixing pile cannot in the use in narrow space.And the present invention takes full advantage of the comprcssive strength of compaction grouting and the tensile strength of Larsen steel sheet pile, it is greatly improved the tensile strength of supporting construction, widens cement mixing pile use in restricted clearance.The present invention arranges compaction grouting by periphery and inside arranges shaped steel and encloses purlin and interior stay tube, the supporting role enclosing purlin and interior stay tube is transferred to whole composite supporting construction by Larsen stake, avoid the partial pressing caused owing to supporting construction directly acts on cement mixing pile to destroy, create condition for stage excavation；Push pipe well generally arranges inlet and outlet cave, and according to pure cement mixing pile, hole exists the risk gushing sand boil soil in foundation ditch after abolishing, and the present invention can be effectively ensured the safety and stability at hole by the tensile strength of Larsen stake in conjunction with the sealing of compaction grouting.
2. it being the abbreviation of SoilMixingWall with SMW(SMW) engineering method compares:
SMW engineering method equipment is huge, it is adaptable to the place that place is comparatively open, needs curing time long after having constructed, and it is longer that bonding apparatus turnover field time used time more entirety takies the construction period.By contrast, equipment required for the present invention and compaction grouting equipment are all smaller, it is possible to for small sized urban site, reduction of erection time, economic benefit is obvious.
Accompanying drawing explanation
Fig. 1 is the top view of the present invention；
Fig. 2 is that the A-A of Fig. 1 is to sectional view；
Fig. 3 is that the B-B of Fig. 1 is to sectional view；
When Fig. 4 is the invention process, subregion spoil is excavated to upper strata and supports the schematic diagram of absolute altitude；
When Fig. 5 is the invention process, subregion spoil is excavated to the schematic diagram of lower layer support absolute altitude；
When Fig. 6 is the invention process, subregion spoil is excavated to the schematic diagram above base plate of foundation pit.
Detailed description of the invention
The present invention is further illustrated below by way of specific embodiment.
Embodiment 1
The Larsen steel sheet pile composite supporting construction of a kind of peripheral hardware compaction grouting, including push pipe 1, Larsen stake 2, encloses purlin 3, connector 4 and interior stay tube 5, and as shown in FIG. 1 to 3, concrete structure is:
Push pipe 1 is located in foundation ditch 10；
Each Larsen stake 2 is all vertically located in foundation ditch 10, and the bottom of Larsen stake 2 is inserted in the bottom surface of foundation ditch 10, and Larsen stake 2 sets gradually around each medial wall of foundation ditch 10, fits in a side of Larsen stake 2 and the medial wall of foundation ditch 10；
Enclose purlin 3 and be horizontally arranged in foundation ditch 10, each medial wall of foundation ditch 10 is hierarchically provided with two rhizosphere purlins 3 from top to bottom, the purlin 3 that encloses being positioned at same layer on each medial wall of foundation ditch 10 is all located in same level, and be positioned in same level to enclose purlin 3 end to end successively by connector 4, every rhizosphere purlin 3 is all fixed with each Larsen stake 2 being located on the same medial wall of foundation ditch 10, and the two ends of interior stay tube 5 are respectively held against and are fixed on and are oppositely arranged and are positioned on two rhizosphere purlins 3 in same level；
In the present embodiment, connector 4 includes right-angle connector 41 and oblique connecting rod 42, and two right-angle sides of right-angle connector 41 post and fix respectively on two adjacent rhizosphere purlins 3, and the two ends of oblique connecting rod 42 are respectively held against and are fixed on two adjacent rhizosphere purlins 3；
Concrete perfusion in foundation ditch 10, push pipe 1 flatly passes in the concrete being poured in foundation ditch 10；
Inspection shaft 20 is built at the middle part of foundation ditch 10 concrete layer by laying bricks or stones.
When the present embodiment uses, implement successively as follows:
Width and the building-in depth of composite supporting construction is determined according to on-site actual situations, to ensure the monolithic stability of foundation ditch, described in detail below；
(1) the width building-in depth of composite supporting construction is determined by the cutting depth of whole foundation ditch.
During excavation of foundation pit, causing supporting construction to produce horizontal direction displacement under external and internal pressure difference effect owing to cheating interior excavation excavation off-load, the Stability Checking passing through excavation of foundation pit when therefore the present embodiment is implemented ensures excavation safety；
(2) arranged by the stage excavation degree of depth and support and determine.
Also being not provided with supporting when excavation of foundation pit is shallower, it is maximum that the deformation of foundation ditch all shows as top displacement, to the horizontal displacement of foundation ditch direction, and main distribution triangular in shape.Being arranged in the implementation process of patent of the degree of depth of stage excavation and support should with the width of composite supporting construction and the degree of depth checking computations index as base pit stability；
(3) soil property situation.
Larsen steel sheet pile adds periphery and arranges the combined type supporting construction of compaction grouting, should take into full account the geological condition that this two kinds of construction technologies can be suitable in work progress.The geological conditions ratio that Larsen steel sheet pile is suitable for is wide, and generally limited is the maximum cutting depth of foundation ditch, and maximum cutting depth is at 7m～8m.Compaction grouting is applicable to medium sand ground, if there being suitable drainage condition may be used without in clay ground.Work progress must be determined according to field geology conditions width and the building-in depth of composite supporting construction, and then determine the version of Larsen steel sheet pile and the technical parameter of supporting form and compaction grouting.
(4) other factors being likely to composite supporting construction produces impact.
Such as: open-assembly time of foundation ditch, the protection of the building around existed or structures, follow-up work are all likely to become, on hole is outer in the impact of composite supporting construction, hole, the factor determining composite supporting construction width and building-in depth with or without dewatering measure.
Being inserted perpendicularly into Larsen stake 2 by root in foundation ditch 10, the bottom of Larsen stake 2 is inserted in the bottom surface of foundation ditch 10, and Larsen stake 2 sets gradually around each medial wall of foundation ditch 10, fits in a side of Larsen stake 2 and the medial wall of foundation ditch 10；
Densification slip casting bottom foundation ditch 10；
Earthwork subregion excavation, common backacter is adopted to excavate, purlin 3 and interior stay tube 5 are enclosed in the installation that interts during excavation, it is horizontally disposed with encloses purlin 3 by root in foundation ditch 10, each medial wall of foundation ditch 10 is hierarchically provided with two rhizosphere purlins 3 from top to bottom, the purlin 3 that encloses being positioned at same layer on each medial wall of foundation ditch 10 is all located in same level, and be positioned in same level to enclose purlin 3 end to end successively by connector 4, every rhizosphere purlin 3 is all fixed with each Larsen stake 2 being located on the same medial wall of foundation ditch 10；The two ends making interior stay tube 5 are respectively held against and are fixed on and are oppositely arranged and are positioned on two rhizosphere purlins 3 in same level；
During subregion excavation, initial absolute altitude is present situation ground elevation；As shown in Figure 4, first time is excavated to the support absolute altitude on upper strata, and that installs upper strata after having excavated encloses purlin 3 and interior stay tube 5；As it is shown in figure 5, upper strata enclose purlin 3 and interior stay tube 5 install after continue to be excavated to the support absolute altitude of lower floor, that installs lower floor after having excavated encloses purlin 3 and interior stay tube 5；As shown in Figure 6, lower floor enclose purlin 3 and interior stay tube 5 install after continue to be excavated to the top 20cm ± 10cm place being located at base plate 101 end absolute altitude bottom foundation ditch 10, remaining soil labor cleaning；
Push pipe 1 is constructed, even if push pipe 1 flatly passes in the concrete being poured in foundation ditch 10；
Inspection shaft 20 is built by laying bricks or stones at the middle part of foundation ditch 10；
Extract Larsen stake 2 and backfill the earthwork.
In the present embodiment, the internal diameter of push pipe is the concrete pipe of 1000mm, and the construction of push pipe section includes 4 active wells and 2 received wells；Push pipe well is gone along with sb. to guard him employing Larsen stake and is added outer 3m scope and the construction technology of the close slip casting of bottom hole pressure；Larsen piling bar bracing engineering is: push pipe well foundation pit enclosure cutting depth is 5.5m～7.7m, the stake of Larsen stake 2 is long for 12m, adopt between Larsen stake 2 and enclose purlin 3 and connect, enclose purlin 3 and adopt that the 400mm × 400mm × 13mm × 21mm of Two bors d's oeuveres HW type is hot rolled H-shaped to be made, right-angle connector 41 adopts the unequal angle of 200mm × 125mm to make, oblique connecting rod 42 adopts that the 400mm × 400mm × 13mm × 21mm of single HW type is hot rolled H-shaped to be made, enclosing the space between purlin 3 and every Larsen stake 2 to squeeze into timber wedge and push against, interior stay tube 5 adopts the steel pipe of Φ 609mm × 16mm to make.
Claims (3)
1. the Larsen steel sheet pile composite supporting construction of a peripheral hardware compaction grouting, including the push pipe (1) being located in foundation ditch (10), it is characterized in that: also include Larsen stake (2), enclose purlin (3), connector (4) and interior stay tube (5)
Each Larsen stake (2) is all vertically located in foundation ditch (10), the bottom of Larsen stake (2) is inserted in the bottom surface of foundation ditch (10), Larsen stake (2) sets gradually around each medial wall of foundation ditch (10), fits in a side of Larsen stake (2) and the medial wall of foundation ditch (10)；
Enclose purlin (3) and be horizontally arranged in foundation ditch (10), each medial wall of foundation ditch (10) is hierarchically provided with at least two rhizosphere purlins (3) from top to bottom, the purlin (3) that encloses being positioned at same layer on foundation ditch (10) each medial wall is all located in same level, and be positioned in same level to enclose purlin (3) end to end successively by connector (4), every rhizosphere purlin (3) is all fixed with each Larsen stake (2) being located on foundation ditch (10) same medial wall, the two ends of interior stay tube (5) are respectively held against and are fixed on and are oppositely arranged and are positioned on two rhizosphere purlins (3) in same level；
Foundation ditch (10) interior concrete perfusion, push pipe (1) flatly traverse in the concrete being poured in foundation ditch (10)；
Inspection shaft (20) is built at the middle part of foundation ditch (10) concrete layer by laying bricks or stones.
2. the Larsen steel sheet pile composite supporting construction of peripheral hardware compaction grouting as claimed in claim 1, it is characterized in that: connector (4) includes right-angle connector (41) and oblique connecting rod (42), two right-angle sides of right-angle connector (41) post and fix respectively on two adjacent rhizosphere purlins (3), and the two ends of oblique connecting rod (42) are respectively held against and are fixed on two adjacent rhizosphere purlins (3).
3. the using method of the Larsen steel sheet pile composite supporting construction of peripheral hardware compaction grouting as claimed in claim 1 or 2, including width and the building-in depth of determining composite supporting construction, is characterized in that: also implement successively as follows:
It is inserted perpendicularly into Larsen stake (2) by root in foundation ditch (10), the bottom of Larsen stake (2) is inserted in the bottom surface of foundation ditch (10), Larsen stake (2) sets gradually around each medial wall of foundation ditch (10), fits in a side of Larsen stake (2) and the medial wall of foundation ditch (10)；
In foundation ditch (10) bottom densification slip casting；
Earthwork subregion excavation, purlin (3) and interior stay tube (5) are enclosed in the installation that interts during excavation, it is horizontally disposed with encloses purlin (3) by root in foundation ditch (10), each medial wall of foundation ditch (10) is hierarchically provided with at least two rhizosphere purlins (3) from top to bottom, the purlin (3) that encloses being positioned at same layer on foundation ditch (10) each medial wall is all located in same level, and be positioned in same level to enclose purlin (3) end to end successively by connector (4), every rhizosphere purlin (3) is all fixed with each Larsen stake (2) being located on foundation ditch (10) same medial wall；The two ends making interior stay tube (5) are respectively held against and are fixed on and are oppositely arranged and are positioned on two rhizosphere purlins (3) in same level；
During subregion excavation, initial absolute altitude is present situation ground elevation, and first time is excavated to the support absolute altitude on upper strata, and that installs upper strata after having excavated encloses purlin (3) and interior stay tube (5)；Upper strata enclose purlin (3) and interior stay tube (5) install after continue to be excavated to the support absolute altitude of lower floor, that installs lower floor after having excavated encloses purlin (3) and interior stay tube (5)；Lower floor enclose purlin (3) and interior stay tube (5) install after continue to be excavated to the top of base plate (101) end absolute altitude being located at foundation ditch (10) bottom, remaining soil labor cleaning；
Push pipe (1) is constructed, though push pipe (1) flatly traverse in the concrete being poured in foundation ditch (10)；
Inspection shaft (20) is built by laying bricks or stones at the middle part of foundation ditch (10)；
Extract Larsen stake (2) and backfill the earthwork.
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Application publication date: 20160720 |