CN214832726U - Supporting structure for pipe-jacking working well in deep soft soil area - Google Patents

Supporting structure for pipe-jacking working well in deep soft soil area Download PDF

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Publication number
CN214832726U
CN214832726U CN202120403241.6U CN202120403241U CN214832726U CN 214832726 U CN214832726 U CN 214832726U CN 202120403241 U CN202120403241 U CN 202120403241U CN 214832726 U CN214832726 U CN 214832726U
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pile
cast
reinforced concrete
concrete
pipe
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裴启涛
和礼红
熊永华
卢方伟
胡云华
段正光
鲜少华
郑盘石
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Wuhan Municipal Engineering Design and Research Institute Co Ltd
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Wuhan Municipal Engineering Design and Research Institute Co Ltd
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Abstract

The utility model relates to a pipe-jacking working well supporting structure in a deep soft soil area, which comprises a triaxial cement mixing pile arranged outside a bored pile, a pile foundation supporting structure arranged on the side wall of each side of a foundation pit of the pipe-jacking working well, a supporting and supporting structure arranged inside the foundation pit and a triaxial cement mixing pile arranged at the bottom of the foundation pit, wherein the three-axis cement mixing pile is arranged on the side wall of each side of the foundation pit of the pipe-jacking working well; the pile foundation supporting structure comprises a plurality of cast-in-situ bored piles, a crown beam and a suspended net C20 sprayed concrete, and the supporting and supporting structure comprises the reinforced concrete inner support and the reinforced concrete waist beam. The utility model discloses a "pile foundation supporting construction + support supporting construction + triaxial soil cement mixing pile stagnant water keeps off silt and the hole end consolidates" joint support system, and construction equipment popularizes, convenient operation, and the security is high, and construction technology is mature, for the design is strutted in deep weak soil district push pipe work well foundation pit, provides a feasible way.

Description

Supporting structure for pipe-jacking working well in deep soft soil area
Technical Field
The utility model relates to a pipe jacking working well foundation pit supporting construction's technical field, concretely relates to deep weak soil district pipe jacking working well supporting construction.
Background
With the continuous acceleration of the urbanization process, the requirements of people on urban environment quality are higher and higher, and with the increasing complexity of underground pipelines such as water supply, drainage, electric power, telecommunication, natural gas and the like, great challenges are brought to the construction engineering of emerging pipe galleries. For a large-scale double-cabin or three-cabin comprehensive pipe gallery located in a deep silt or silt clay area, a large number of building groups and existing underground pipelines are distributed around the large-scale double-cabin or three-cabin comprehensive pipe gallery, the traditional open excavation construction method has extremely high risk, and the healthy development of urban pipe gallery engineering is severely restricted.
With the progress of society and the development of science and technology, the pipe jacking construction technology is mature day by day. In view of the advantages of small excavation range, flexible line layout, small influence by ground buildings (structures), low construction noise and the like of the pipe jacking construction, the pipe jacking construction method plays an increasingly important role in underground pipe gallery construction. Engineering practices show that the difficulty of pipe jacking construction mainly lies in how to ensure the safety of the pipe jacking working well. The pipe jacking working well can be constructed by adopting a sinking well method or an open cut method. However, for the pipe jacking working well located in the deep silt or silt soft soil area, the difference of soil layer properties is large, and if the open caisson method is adopted for construction, the open caisson sinking speed is unstable, and the open caisson inclines and displaces greatly, so that the feasibility is low. In addition, when the pipe jacking working well in a deep and thick soft soil area and with a large span is constructed by an open cut method, the back of a pit often cracks due to adverse factors such as underground water leakage and overlarge jacking force, and great threat is brought to engineering safety construction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a deep weak soil district push pipe working well supporting construction is provided, for the excavation supporting design of deep weak soil district push pipe working well, provide a safe, reasonable, reliable solution way.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
the utility model provides a deep soft soil district push pipe working well supporting construction, includes:
the pile foundation supporting structure is arranged on the side wall of each side of the foundation pit of the pipe-jacking working well and comprises a plurality of cast-in-situ bored piles, crown beams and a hanging net C20 sprayed concrete, the plurality of cast-in-situ bored piles are buried in the foundation pit soil body, the tops of the plurality of cast-in-situ bored piles are connected by the crown beams, the cast-in-situ bored piles are closed by the hanging net C20 sprayed concrete, and the cast-in-situ bored piles penetrate through the silty soft soil and extend into a stable soil layer below;
the supporting and supporting structure is arranged on the inner side of the foundation pit of the pipe jacking working well and comprises a reinforced concrete inner support and a reinforced concrete waist beam, the reinforced concrete inner support comprises two reinforced concrete inclined struts and two reinforced concrete straight struts, the reinforced concrete waist beam is cast with the cast-in-situ bored pile, the first reinforced concrete inclined strut and the reinforced concrete straight strut are cast and connected with the crown beam, and the second reinforced concrete inclined strut and the reinforced concrete straight strut are cast and connected with the reinforced concrete waist beam;
and the triaxial cement-soil mixing pile is arranged on the outer side of the cast-in-situ bored pile and at the bottom of the foundation pit of the pipe-jacking working well.
The utility model has the advantages that: the utility model provides a pair of deep weak soil district push pipe work well supporting construction adopts "pile foundation supporting construction + support supporting construction + triaxial soil cement mixing pile stagnant water to keep off silt and the hole end consolidates" joint support system, has advantages such as construction equipment popularization, convenient operation, security height, construction technology maturity, provides a feasible way for deep weak soil district push pipe work well foundation pit supporting design.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, when the triaxial soil cement mixing pile is arranged on the outer side of the cast-in-situ bored pile, the triaxial soil cement mixing pile is meshed with each other, and the length of the triaxial soil cement mixing pile is consistent with that of the cast-in-situ bored pile.
The beneficial effects of the further scheme are as follows: through set up the round in the drilling bored concrete pile outside triaxial soil cement mixing pile, mutual interlock between the stake, and the stake length with flush at the bottom of the bored concrete pile, form a confined airtight space, can prevent soil erosion and water loss to realize stagnant water, keep off the good effect that becomes silted up.
Furthermore, the triaxial soil cement mixing pile at the bottom of the foundation pit is arranged in a full-space mode at the bottom of the foundation pit and is occluded with the cast-in-situ bored pile, and the cement mixing pile and the cast-in-situ bored pile on the side wall at the bottom of the foundation pit are horizontally and bidirectionally constrained in the foundation pit soil body.
Preferably, the diameter of the triaxial cement-soil mixing pile is 0.85m, the longitudinal and transverse spacing is 0.6m, and the occlusion is 0.25 m; the cement strength grade adopted by the triaxial cement-soil mixing pile is not lower than 42.5 MPa.
The beneficial effect of adopting the further scheme is that: the triaxial soil cement mixing pile is adopted for reinforcing the soil body in the passive area pit, so that the problem of pit bottom uplift risk easily occurring in a deep and thick soft soil area is solved, the mechanical property of sludge or sludge soft soil is obviously improved, and the stability of a foundation pit is greatly enhanced.
Further: bored concrete pile includes hat roof beam, a plurality of bored concrete pile owner muscle, bored concrete pile stirrup, bored concrete pile reinforcement hoop and cushion, and is a plurality of the even interval ring shape of bored concrete pile owner muscle sets up, the bored concrete pile stirrup sets up the periphery of bored concrete pile owner muscle, the bored concrete pile reinforcement hoop sets up the interior week of bored concrete pile owner muscle, the cushion welding is in on the bored concrete pile owner muscle, just the cushion is located the periphery of bored concrete pile owner muscle, hat roof beam sets up the upper end of bored concrete pile owner muscle, just the upper end of bored concrete pile owner muscle stretches into in the hat roof beam, a plurality of bored concrete pile owner muscle, bored concrete pile stirrup and bored concrete pile reinforcement hoop are through pouring into and forming the bored concrete pile.
Preferably: the cast-in-situ bored pile is made of underwater C30 concrete, and the thickness of the protective layer is 70 mm; the strength grade of the crown beam concrete is C30, and the thickness of the protective layer is 50 mm.
The beneficial effects of the further scheme are as follows: the cast-in-place pile main reinforcement, the cast-in-place pile stirrups and the cushion blocks form a steel bar support, concrete pouring is performed, the resistance effect of the cast-in-place pile is increased, the acting force of a soil body can be transmitted to a stable soil layer, the bending rigidity and the shearing strength of the deep soft soil area supporting structure are obviously improved, and therefore the stability of the deep soft soil area supporting structure to the foundation pit supporting is ensured.
Further: the crown beam comprises a framework and a crown beam main body, wherein the framework is arranged at the upper end of the crown beam main body, and the framework and the crown beam main body are poured through concrete to form the crown beam.
The beneficial effects of the further scheme are as follows: the framework and the crown beam main body are integrally formed through pouring through concrete, so that the firmness and the uniform stress of the cast-in-situ bored pile can be ensured, and the structural stability of the cast-in-situ bored pile and the whole pile foundation supporting structure is ensured.
Further, the reinforced concrete inner support comprises a framework and a support main body, the framework comprises reinforced concrete support top surface longitudinal ribs, reinforced concrete support side surface longitudinal ribs and reinforced concrete support stirrups, and the framework and the support main body are poured through concrete to form the reinforced concrete inner support.
Preferably, the reinforced concrete wale and the cast-in-situ bored pile are cast by using the hanging bars, the connecting bars and the C30 concrete, the first reinforced concrete diagonal brace and the reinforced concrete straight brace are cast and connected with the crown beam by using C30 concrete, and the second reinforced concrete diagonal brace and the reinforced concrete straight brace are cast and connected with the reinforced concrete wale by using C30 concrete.
The beneficial effect of adopting the further scheme is that: through the pouring of the two reinforced concrete inner supports, the reinforced concrete crown beam and the reinforced concrete waist beam, the compressive strength, the shear strength and the bending rigidity of the reinforced concrete inner supports can be fully exerted, the deformation of soil bodies around the foundation pit is reduced, a larger working well construction space can be obtained, and the reinforced concrete inner support structure is simple in structure and stable in support structure.
Furthermore, a catch drain is arranged on the ground surface at the top of the foundation pit of the pipe-jacking working well.
The beneficial effect of adopting the further scheme is that: the intercepting ditch is used for cutting off and discharging surface accumulated water, rainwater and construction water, reduces the infiltration of the intercepting ditch into a foundation pit soil body, and further protects the stability of the supporting structure.
Drawings
Fig. 1 is the utility model relates to a deep weak soil district push pipe working well supporting construction's planar diagram.
FIG. 2 is a schematic sectional view A-A of FIG. 1.
Fig. 3 is the utility model relates to a deep weak soil district push pipe working well supporting construction's bored concrete pile keeps off silt and hole bottom reinforcement plane schematic diagram with triaxial cement mixing pile stagnant water, and the arrow point direction represents the foundation ditch direction.
Fig. 4 is the utility model relates to a deep weak soil district push pipe working well supporting construction's bored concrete pile arrangement of reinforcement sketch map.
Fig. 5 is the utility model relates to a deep weak soil district push pipe working well supporting construction's bored concrete pile hat roof beam arrangement of reinforcement schematic diagram.
Fig. 6 is the utility model relates to a reinforced concrete supports arrangement of reinforcement schematic diagram of deep weak soil district push pipe working well supporting construction.
Fig. 7 is the utility model relates to a drilling bored concrete pile lateral wall hangs net section sketch map of deep weak soil district push pipe work well supporting construction.
Fig. 8 is the utility model relates to a deep weak soil district push pipe working well supporting construction's drilling bored concrete pile and reinforced concrete waist rail connection schematic diagram.
In the drawings, the components represented by the respective reference numerals are listed below: 1-foundation pit soil, 2-triaxial cement-soil mixing pile, 3-crown beam, 4-bored pile, 5-reinforced concrete diagonal bracing, 6-pipe-jacking working well structure, 7-reinforced concrete straight bracing, 8-foundation pit top, 9-catch basin, 10-hanging net C20 spray concrete, 11-reinforced concrete waist beam, 12-bored pile main reinforcement, 13-bored pile stirrup, 14-bored pile reinforcement hoop, 15-cushion block, 16-crown beam side longitudinal reinforcement, 17-crown beam top longitudinal reinforcement, 18-crown beam lacing reinforcement, 19-crown beam stirrup, 20-reinforced concrete support top longitudinal reinforcement, 21-reinforced concrete support side longitudinal reinforcement, 22-reinforced concrete support stirrup, 23-2 phi 16 HRB400 grade reinforcement, 24-2 phi 14 HRB400 grade full length reinforcement, 25-planting reinforcement, 26-hanging steel bars, 27-connecting steel bars.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1-2, the supporting structure of the pipe-jacking working well in the deep soft soil area comprises a pile foundation supporting structure, a supporting structure and a triaxial cement mixing pile 2; the pile foundation supporting structure is arranged on the side wall of each side of the foundation pit of the pipe jacking working well 6, and comprises a plurality of cast-in-situ bored piles 4, a crown beam 3 and a hanging net C20 sprayed concrete 10; the supporting and supporting structure is arranged on the inner side of a foundation pit of the pipe jacking working well 6, the supporting and supporting structure comprises a reinforced concrete inner support and a reinforced concrete waist beam 11, and the reinforced concrete inner support comprises two reinforced concrete inclined struts 5 and two reinforced concrete straight struts 7; and the triaxial cement-soil mixing pile 2 is arranged at the outer side of the cast-in-situ bored pile 4 and the bottom of a foundation pit of the pipe-jacking working well 6.
The utility model discloses a deep weak soil district push pipe work well supporting construction keeps off silt and hole end reinforcement' joint support system through adopting "pile foundation supporting construction + support supporting construction + triaxial soil cement mixing pile stagnant water, has advantages such as construction equipment popularization, convenient operation, the security is high, construction technique is ripe, be particularly useful for complicated geological conditions, the engineering region that the requirement is strict warp on every side, for deep weak soil district push pipe work well foundation pit support design, a safe, reasonable, reliable solution way is provided.
In one or more embodiments of the present invention, the triaxial soil cement mixing pile 2 is disposed outside the cast-in-situ bored pile 4, the triaxial soil cement mixing pile 2 is engaged with each other, and the length of the triaxial soil cement mixing pile 2 is consistent with the cast-in-situ bored pile 4. Through set up the round in the 4 outsides of drilling bored concrete pile triaxial soil cement mixing pile 2, mutual interlock between the stake, and the stake length with the 4 pile bottoms of drilling bored concrete pile flush, form a confined airtight space, can prevent soil erosion and water loss to realize stagnant water, keep off the good effect that becomes silted up.
Specifically, as shown in fig. 3, the triaxial soil-cement mixing pile 2 has a diameter of 0.85m, a longitudinal and transverse spacing of 0.6m, and a bite of 0.25 m. The cement strength grade adopted by the triaxial cement soil mixing pile 2 is not lower than 42.5MPa, and the reference cement consumption of the actual mixing pile body is about 20 percent, namely the cement mixing amount in each cubic meter of the mixed soil body is about 360 kg.
As shown in fig. 4, 5 and 7, in one or more embodiments of the present invention, the pile foundation supporting structure includes many bored concrete piles 4, crown beam 3 and hanging net C20 to spray concrete 10, many bored concrete pile 4 is buried underground in foundation pit soil 1, and many bored concrete pile 4 top is adopted cast-in-place concrete crown beam 3 connects, adopt between bored concrete pile 4 piles hanging net C20 sprays concrete 10 and seals, bored concrete pile 4 pierces through the silt soft soil and stretches into to the stable soil layer of below. Through inciting somebody to action many bored concrete piles 4 are vertical to be penetrated through in the silt matter soft soil and get into stabilized soil layer, adopt between 4 piles of bored concrete pile hang net C20 and spray concrete 10 and seal, and many 4 tops of bored concrete pile adopt crown beam 3 connects, makes pile foundation supporting structure become one whole like this, improves the homogeneity of supporting structure atress, also can prevent the soil erosion phenomenon that the infiltration leads to between the pile, can also transmit the effort of the soil body to in the stabilized soil layer of foundation ditch soil body 1, show the bending stiffness and the shear strength who improve deep soft soil area supporting structure to ensure its stability to foundation ditch support.
Specifically, the thickness of the concrete sprayed by the hanging net C20 is 100mm, the mesh reinforcement is phi 6.5@200x200, the mesh reinforcement is fixed by the planting bars 25 and anchored into the bored pile for 300mm, the planting bars 25 are welded with two sides of 2 HRB 400-grade steel bars 23 with the diameter of 16mm and the length of 50mm, and are fixed in the concrete sprayed by the hanging net C20 through 2 HRB 400-grade through-length steel bars 24 with the diameter of 14mm, the foundation pit soil body 1 is excavated and then is sprayed with slurry to protect the slope, the exposure time is reduced as far as possible, and the water spraying maintenance is not less than 1 week after the concrete is finally solidified for 2 hours.
As shown in fig. 8, in one or more embodiments of the utility model, support supporting construction include in the reinforced concrete support with reinforced concrete waist rail 11, the reinforced concrete support include in the reinforced concrete interior reinforced concrete bracing 5 reinforced concrete props 7 directly, reinforced concrete waist rail 11 with bored concrete pile 4 adopts hang muscle 26 connecting reinforcement 27 and C30 concrete are pour, first way reinforced concrete bracing 5 with reinforced concrete props 7 directly with crown beam 3 adopts the C30 concrete to pour and connects, the second way reinforced concrete bracing 5 with reinforced concrete props 7 directly with reinforced concrete waist rail 11 adopts the C30 concrete to pour and connects.
Preferably, as shown in fig. 6, the reinforced concrete inner support includes a framework and a support main body, the framework includes a reinforced concrete support top longitudinal rib 20, a reinforced concrete support side longitudinal rib 21 and a reinforced concrete support stirrup 22, and the framework and the support main body are cast by concrete to form the reinforced concrete inner support.
In this embodiment, the two reinforced concrete inner supports, the reinforced concrete crown beam 3 and the reinforced concrete wale 11 are poured, so that the compressive strength, the shear strength and the bending rigidity of the reinforced concrete inner supports can be fully exerted, the deformation of the soil body around the foundation pit is reduced, a larger working well construction space can be obtained, the structure is simple, and the supporting structure is stable.
Specifically, the thickness of the reinforced protective layer in the reinforced concrete is 40mm, the included angle between the reinforced concrete diagonal brace 5 and the side line of the foundation pit is about 45 degrees, the inner support size (wide x height) in the first reinforced concrete is 700mmx700mm, the inner support size (wide x height) in the second reinforced concrete is 700mmx900mm, the inner support interval is not more than 7m, the size (wide x height) of the reinforced concrete waist beam 11 is 1400mm x900mm, the reinforced concrete waist beam 11 and the hanging bar 26 and the connecting steel bar 27 which are adopted between the cast-in-situ bored piles 4 are both-side welded with the main bar of the cast-in-situ bored piles 4, the size of the welding leg is not less than 8mm, the hanging bar 26 adopts 1 HRB 400-grade steel bar with the diameter of 25mm, and the connecting steel bar 27 adopts 1 HRB 400-grade steel bar with the diameter of 16 mm.
The utility model discloses an in one or more embodiments, bored concrete pile 4 includes hat roof beam 3, a plurality of bored concrete pile owner muscle 12, bored concrete pile stirrup 13, bored concrete pile reinforcement hoop 14 and cushion 15, and is a plurality of the even interval annular of bored concrete pile owner muscle 12 sets up, bored concrete pile stirrup 13 sets up the periphery of bored concrete pile owner muscle 12, bored concrete pile reinforcement hoop 14 sets up the interior week of bored concrete pile owner muscle 12, the cushion 15 welding is in on bored concrete pile owner muscle 12, just cushion 15 is located the periphery of bored concrete pile owner muscle 12, hat roof beam 3 sets up the upper end of bored concrete pile owner muscle 12, just the upper end of bored concrete pile owner muscle 12 stretches into in hat roof beam 3, a plurality of bored concrete pile owner muscle 12, bored concrete pile stirrup 13 and bored concrete pile reinforcement hoop 14 pass through the pouring and form bored concrete pile 4. The cast-in-place pile main reinforcement 12, the cast-in-place pile stirrups 13 and the cushion blocks 15 form a steel bar support, and then concrete pouring is carried out, so that the resistance action of the cast-in-place bored pile 4 is increased, the acting force of a soil body can be transmitted to a stable soil layer, the bending rigidity and the shear strength of the deep soft soil area supporting structure are obviously improved, and the stability of the foundation pit supporting structure is ensured.
Specifically, the bored pile 4 is made of underwater C30 concrete, the thickness of the protective layer is 70mm, the strength grade of the crown beam 3 concrete is C30, and the thickness of the protective layer is 50mm, the bored pile 4 is constructed by adopting pile separation, and after the concrete of adjacent piles reaches 70% of the designed strength, hole forming construction can be carried out.
In one or more embodiments of the present invention, the crown beam 3 includes a frame and a crown beam main body, the frame is disposed at an upper end of the crown beam main body, and the frame and the crown beam main body are formed by concrete casting the crown beam 3. Will through the concrete skeleton and crown beam main part form wholly through pouring, can ensure drilling bored concrete pile 4's fastness and atress are even, guarantee drilling bored concrete pile 4 and whole pile foundation supporting construction's structural stability.
In practice, as shown in fig. 5, the framework is composed of a plurality of circular crown beam side longitudinal ribs 16, a plurality of top surface longitudinal ribs 17, a plurality of crown beam tie bars 18 and a plurality of crown beam stirrups 19, the plurality of crown beam side longitudinal ribs 16 are vertically arranged at intervals, the plurality of crown beam top surface longitudinal ribs 17 are connected with the crown beam side longitudinal ribs 16, and then the whole crown beam with the protective layer is formed by concrete pouring.
In one or more embodiments of the present invention, the triaxial soil cement mixing pile 2 at the bottom of the foundation pit is arranged in a full-space manner at the bottom of the foundation pit, and is engaged with the bored concrete pile 4, at the bottom of the foundation pit, the triaxial soil cement mixing pile 2 and the sidewall are horizontally and bidirectionally constrained in the foundation pit soil body 1. The triaxial soil cement mixing pile 2 is adopted to reinforce the soil body in the passive area pit, so that the problem of pit bottom uplift risk easily occurring in a deep soft soil area is solved, the mechanical property of sludge or sludge soft soil is obviously improved, and the stability of a foundation pit is greatly enhanced.
Specifically, the diameter of the triaxial cement-soil mixing pile 2 is 0.85m, the longitudinal and transverse spacing is 0.6m, and the occlusion is 0.25 m. The cement strength grade adopted by the triaxial cement soil mixing pile 2 is not lower than 42.5MPa, the concrete mixing is performed above the bottom of the foundation pit, and the reference cement consumption of the concrete mixing pile body is about 20 percent, namely the cement mixing amount in the mixed soil per cubic meter is about 360 kg; and air stirring is performed below the bottom of the foundation pit, the reference cement consumption of the air stirring pile body is about 8 percent of the reference cement content, namely the cement mixing amount in the stirred soil body per cubic meter is about 144 kg.
In one or more embodiments of the present invention, as shown in fig. 8, a catch drain 9 is provided on the ground surface of the top 8 of the foundation pit of the pipe-jacking working well 6. The intercepting ditch 9 is used for cutting off and removing surface accumulated water, rainwater and construction water, so that the infiltration of the intercepting ditch into the foundation pit soil body 1 can be obviously reduced, and the stability of the supporting structure is further protected.
The utility model discloses a concrete implementation step as follows:
the method comprises the following steps: the method comprises the steps of site obstacle removal, leveling, pipeline relocation and site enclosure. Before construction, necessary obstacle clearing work is carried out, surface water is drained, and construction affected areas are blocked to ensure safety.
Step two: and constructing the cast-in-situ bored pile 4, then constructing the triaxial cement-soil mixing pile 2, reinforcing the bottom of the pit and embedding a waterproof curtain, and embedding a monitoring point.
Step three: and excavating the foundation pit soil body 1 and erecting the reinforced concrete inner supports in a layering mode, and after the reinforced concrete inner support concrete reaches 80% of design strength, continuously excavating until the design elevation of the bottom of the foundation pit is reached.
Step four: after the foundation pit soil body 1 is excavated, a cushion layer of a bottom plate of the pipe-jacking working well structure 6, and a bottom plate and side walls of the structure are poured.
Step five: and breaking the cast-in-situ bored pile 4, and performing pipe jacking construction.
Step six: and after the construction of the jacking pipe is finished, removing the 2 nd support when the construction of the side wall is 50cm below the bottom of the 2 nd support.
Step seven: constructing the inner wall and the top plate of the pipe-jacking working well structure 6, backfilling to 50cm below the bottom of the first support after the structure reaches 100% of design strength, removing the support of the 1 st support, and backfilling to the ground according to requirements;
step eight: and after the foundation pit construction is finished, the upper structure and the road engineering are continuously constructed.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. The utility model provides a deep soft soil district push pipe working well supporting construction which characterized in that includes:
the pile foundation supporting structure is arranged on the side wall of each side of a foundation pit of the pipe jacking working well (6), the pile foundation supporting structure comprises a plurality of cast-in-situ bored piles (4), crown beams (3) and a net hanging C20 sprayed concrete (10), the plurality of cast-in-situ bored piles (4) are buried in a foundation pit soil body (1), the tops of the plurality of cast-in-situ bored piles (4) are connected through the crown beams (3), the piles of the cast-in-situ bored piles (4) are sealed by the net hanging C20 sprayed concrete (10), and the cast-in-situ bored piles (4) penetrate through muddy soft soil and stretch into a stable soil layer below;
the supporting and supporting structure is arranged on the inner side of a foundation pit of the pipe jacking working well (6), the supporting and supporting structure comprises a reinforced concrete inner support and a reinforced concrete waist beam (11), the reinforced concrete inner support comprises two reinforced concrete diagonal supports (5) and a reinforced concrete straight support (7), the reinforced concrete waist beam (11) is poured with the cast-in-situ bored pile (4), the reinforced concrete diagonal support (5) and the reinforced concrete straight support (7) are poured and connected with the top beam (3) for the first time, and the reinforced concrete diagonal support (5) and the reinforced concrete straight support (7) are poured and connected with the reinforced concrete waist beam (11) for the second time;
and the triaxial cement-soil mixing pile (2) is arranged at the outer side of the cast-in-situ bored pile (4) and the bottom of the foundation pit of the pipe-jacking working well (6).
2. The pipe-jacking working well supporting structure for the deep soft soil area according to claim 1, characterized in that: triaxial soil cement mixing pile (2) set up in during drilling bored concrete pile (4) outside, triaxial soil cement mixing pile (2) interlock each other, triaxial soil cement mixing pile (2) pile length with drilling bored concrete pile (4) are unanimous.
3. The pipe-jacking working well supporting structure for the deep soft soil area according to claim 1, characterized in that: triaxial soil cement mixing pile (2) set up in during push pipe working well (6) foundation ditch bottom, triaxial soil cement mixing pile (2) adopt the full hall formula at the bottom of the pit to arrange, and with bored concrete pile (4) interlock, the bottom of the pit triaxial soil cement mixing pile (2) and lateral wall bored concrete pile (4) level two-way restraint in foundation ditch soil body (1).
4. The pipe-jacking working well supporting structure in the deep soft soil area as claimed in claim 2 or 3, wherein: the diameter of the triaxial cement-soil mixing pile (2) is 0.85m, the longitudinal and transverse spacing is 0.6m, and the occlusion is 0.25 m; the cement strength grade adopted by the triaxial cement-soil mixing pile (2) is not lower than 42.5 MPa.
5. The pipe-jacking working well supporting structure for the deep soft soil area according to claim 1, characterized in that: the cast-in-situ bored pile (4) comprises a crown beam (3), a plurality of cast-in-situ bored pile main reinforcements (12), cast-in-situ bored pile stirrups (13), cast-in-situ bored pile reinforcing hoops (14) and cushion blocks (15), wherein the cast-in-situ bored pile main reinforcements (12) are uniformly arranged in an annular manner at intervals, the cast-in-place pile stirrups (13) are arranged on the periphery of the cast-in-place pile main reinforcements (12), the cast-in-place pile reinforcing hoop (14) is arranged on the inner periphery of the cast-in-place pile main rib (12), the cushion block (15) is welded on the cast-in-place pile main rib (12), the cushion blocks (15) are positioned at the periphery of the main reinforcement (12) of the cast-in-place pile, the crown beam (3) is arranged at the upper end of the main reinforcement (12) of the cast-in-place pile, and the upper end of the main reinforcement (12) of the cast-in-place pile extends into the crown beam (3), the top beam (3), the plurality of cast-in-place pile main reinforcements (12), the cast-in-place pile stirrups (13) and the cast-in-place pile reinforcing hoops (14) are cast to form the cast-in-place bored pile (4).
6. The pipe-jacking working well supporting structure for the deep soft soil area according to claim 5, characterized in that: the cast-in-situ bored pile (4) is made of underwater C30 concrete, and the thickness of a protective layer is 70 mm; the strength grade of the concrete of the crown beam (3) is C30, and the thickness of the protective layer is 50 mm.
7. The pipe-jacking working well supporting structure for the deep soft soil area according to claim 6, wherein the supporting structure comprises: the crown beam (3) comprises a framework and a crown beam main body, the framework is arranged at the upper end of the crown beam main body, and the framework and the crown beam main body are formed into the crown beam (3) through concrete pouring.
8. The pipe-jacking working well supporting structure for the deep soft soil area according to claim 1, characterized in that: the reinforced concrete inner support comprises a framework and a support main body, wherein the framework comprises reinforced concrete support top surface longitudinal ribs (20), reinforced concrete support side surface longitudinal ribs (21) and reinforced concrete support stirrups (22), and the framework and the support main body are poured through concrete to form the reinforced concrete inner support.
9. The pipe-jacking working well supporting structure for the deep soft soil area according to claim 1, characterized in that: the reinforced concrete wale (11) and the cast-in-situ bored pile (4) are cast by adopting hanging bars (26), connecting bars (27) and C30 concrete, the first reinforced concrete diagonal brace (5) and the reinforced concrete straight brace (7) are cast and connected with the crown beam (3) by adopting C30 concrete, and the second reinforced concrete diagonal brace (5) and the reinforced concrete straight brace (7) are cast and connected with the reinforced concrete wale (11) by adopting C30 concrete.
10. The pipe-jacking working well supporting structure for the deep soft soil area according to claim 1, characterized in that: and a water intercepting ditch (9) is arranged on the ground surface of the top (8) of the foundation pit of the pipe jacking working well (6).
CN202120403241.6U 2021-02-23 2021-02-23 Supporting structure for pipe-jacking working well in deep soft soil area Active CN214832726U (en)

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