CN113529739B - Coaxial expansion assembled support, shaftless rotary sprayer and corresponding construction method - Google Patents
Coaxial expansion assembled support, shaftless rotary sprayer and corresponding construction method Download PDFInfo
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- CN113529739B CN113529739B CN202110860489.XA CN202110860489A CN113529739B CN 113529739 B CN113529739 B CN 113529739B CN 202110860489 A CN202110860489 A CN 202110860489A CN 113529739 B CN113529739 B CN 113529739B
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- 238000010276 construction Methods 0.000 title claims abstract description 73
- 239000002689 soil Substances 0.000 claims abstract description 117
- 239000004568 cement Substances 0.000 claims abstract description 84
- 238000005507 spraying Methods 0.000 claims abstract description 58
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 239000000725 suspension Substances 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims description 55
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 238000004519 manufacturing process Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 239000004567 concrete Substances 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 4
- 239000011178 precast concrete Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000006872 improvement Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 10
- 239000002131 composite material Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 238000010992 reflux Methods 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The coaxial expanding body assembly type support adopts an assembly type suspension section and a coaxial expanding body technology, so that the bearing capacity is increased, materials are recycled, the cost is reduced, the quality is controllable, and obvious optimization, upgrading and upgrading are brought to the upright post and diagonal bracing of the traditional foundation pit enclosure; the shaftless rotary sprayer comprises a stator fluid conveyer and a rotor sprayer, has no vehicle body and drill rod, has an automatic forward function, is used for hole guiding and rotary spraying expansion construction, can also be used for construction of anchor rods, cement soil walls with equal thickness and related enclosing structures, and can finish rotary spraying body construction under complex conditions. The assembled support and the shaftless rotary sprayer are green and environment-friendly, shorten the construction period, facilitate construction, reduce the cost, improve the construction quality, have obvious unexpected improvements in the aspects of economy, convenience, social beneficial performance and the like compared with the prior art, have more obvious and outstanding social benefit and economic benefit, and further promote the industrial upgrading of foundation pit engineering.
Description
Technical Field
The invention relates to the technical field of foundation pit engineering, in particular to an assembled support, and specifically relates to a coaxial expanded assembled support, a shaftless rotary sprayer and a corresponding construction method thereof.
Background
When the foundation pit support pile wall adopts a support type without a supporting point, which cannot meet the requirements of safety and environmental protection, a method for increasing the supporting point is often adopted to reduce the bending moment and shearing force of the support pile wall and provide the anti-overturning capability of the support structure. The internal support is a main form of a fulcrum and comprises a flat support (a horizontal support) and an inclined support (an included angle is formed between the axis of the inclined support and the horizontal plane), and the flat support generally needs to vertically support the upright post of the flat support.
Currently, the columns in the prior art are generally disposable and non-reusable. The technical proposal is that the prior diagonal bracing is divided into a traditional diagonal bracing and a front diagonal bracing, the diagonal bracing can be reused, but has disadvantages due to the limitation of the diagonal bracing on the excavation of the foundation pit, and the front diagonal bracing (which is arranged before the excavation of the earthwork) is to integrally arrange a component (a pile body or a pipe body) into the soil body at the bottom of the pit, so that the prior diagonal bracing has the condition of reuse. In addition, the equal-diameter inclined pile body or inclined strut body often has the defects that the bearing capacity of the component is excessive and the bearing capacity provided by the soil body is insufficient, the front cement stirring or rotary spraying technology (which refers to construction before the component is put in) is adopted to expand the inner component of the soil body, the requirement that the concentricity or coaxiality of the cement soil body and the component is difficult to ensure is also existed, and the rear component (which refers to construction after the cement soil is put in) can possibly mix the undisturbed soil and the cement slurry unevenly and randomly, so that the increase of the discreteness of the supporting safety degree and the decrease of the reliability are brought. There are also processes that use the outer synchronous grouting jacking along the axis of the component, but the uniform and effective body expansion effect cannot be obtained.
The rotary spraying technology adopted by the high-pressure spraying cement in the conventional technology is complicated and low in efficiency due to the fact that the drill rod of the pile driver is frequently disassembled, and even if high-pressure rotary spraying equipment with long drill rods is adopted, implementation is often limited due to the limitation of fields and spaces, and high requirements of curved rotary spraying, placement of auxiliary supporting structures to soil bodies and the like are difficult to finish.
In view of the above problems, there is a need for new innovative ideas that bring technical improvements, and the present invention will provide new innovative technologies to improve the shortcomings and drawbacks of the prior art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a more cost-saving, environment-friendly, efficient and energy-saving assembled support, namely a coaxial expanded assembled support which can be used as an inclined strut or a flat strut upright post outside a foundation pit support; the shaftless rotary sprayer is used for construction of coaxial expansion body assembly type support, construction of underground horizontal rotary spraying bodies, and construction of processes of forming holes, grooves, forming cement soil walls and the like of anchor rods and enclosure pile walls of foundation pit engineering.
In order to achieve the above purpose, the coaxial expanded body assembly type support of the invention adopts the following technical scheme:
The coaxial expansion assembly type support comprises a suspension section and a coaxial expansion section, wherein the suspension section is arranged between a pit bottom soil body and an enclosure structure, the coaxial expansion section is arranged below the pit bottom soil body, the coaxial expansion section comprises a lattice type bearing frame and coaxial slurry, the lattice type bearing frame is coincident with the longitudinal axis of the coaxial slurry, and the coaxial expansion assembly type support is arranged as an inclined strut of a foundation pit support or an upright column of a foundation pit support flat strut.
The longitudinal axis is an axis along the length direction of the coaxial expanded body assembled support, and the coaxial axes are coincident.
The suspended section is arranged to be assembled and comprises an assembled prefabricated standard section which can be recycled, the prefabricated standard section is arranged to be a hollow pipe body and is made of steel, concrete or steel concrete composite materials, and the pipe wall of the pipe body is arranged to be solid or lattice. The hollow pipe body is internally provided with a pore canal along the direction of the extension line of the longitudinal axis of the pipe body, and the pore canal penetrates through the longitudinal axis of the coaxial expanding body assembled support and is communicated with the tail end of the lattice type bearing frame.
Optionally, the suspended section and the coaxial expanded section are arranged as continuous integral components, and are connected in sections and then placed into soil.
Alternatively, the prefabricated standard section is configured as a solid (hollow inside) cylinder, and is made of steel, concrete or a steel-concrete composite material.
The prefabricated standard section adopts an assembled connection mode, and the assembled connection mode is based on a limiting outer cylinder bolt or a limiting inner cylinder bolt:
the limiting outer cylinder bolt is arranged as a cylinder body, the joint position of the prefabricated standard section is externally covered by the prefabricated standard section, the inner wall of the limiting outer cylinder bolt is matched with the outer wall of the prefabricated standard section and is partially overlapped with the adjacent two prefabricated standard sections respectively, the limiting outer cylinder bolt is coaxial with the prefabricated standard section and is connected with the limiting outer cylinder bolt through a steel bolt arranged in the direction vertical to the longitudinal axis, or the steel bolt does not penetrate through (called a bolt) the prefabricated standard section and the limiting outer cylinder bolt, the limiting outer cylinder bolt is arranged to limit the adjacent prefabricated standard section to stagger or bend along the direction vertical to the longitudinal axis of the prefabricated standard section, and the adjacent prefabricated standard section is directly propped up along the direction parallel to the longitudinal axis and directly transmits the axial force. The through is that the steel bolt penetrates through the prefabricated standard section; the non-penetration means that the steel bolt does not completely penetrate through the prefabricated standard section.
The limiting inner cylinder bolt is arranged as a cylinder body, is embedded in the joint position of the prefabricated standard section, the outer wall of the limiting inner cylinder bolt is matched with the inner wall of the prefabricated standard section and is partially overlapped with the adjacent two prefabricated standard sections respectively, the limiting inner cylinder bolt is coaxial with the prefabricated standard section and is connected with the limiting inner cylinder bolt through a steel bolt arranged in the direction perpendicular to the longitudinal axis, or the steel bolt does not penetrate (called a bolt) the prefabricated standard section and the limiting inner cylinder bolt, and the limiting inner cylinder bolt is arranged to limit the adjacent prefabricated standard section to stagger or bend along the longitudinal axis perpendicular to the prefabricated standard section.
Optionally, the limiting outer cylinder bolt and the limiting inner cylinder bolt are connected with a transverse rib in a plane perpendicular to the longitudinal axis, the transverse rib is arranged between the ends of the adjacent prefabricated standard sections, the transverse rib can prevent the limiting outer cylinder bolt (provided with an inner transverse rib) or the limiting inner cylinder bolt (provided with an outer transverse rib) from sliding along the longitudinal axis, the limiting outer cylinder bolt and the limiting inner cylinder bolt have similar functions as the steel bolt, and the adjacent prefabricated standard sections transmit axial force along the direction parallel to the longitudinal axis through the transverse rib.
The prefabricated standard section and the cylinder bolt are made of steel, concrete or steel concrete composite materials.
Optionally, the pipe wall of the prefabricated standard section is provided with a lattice, and the longitudinal angle steel, the transverse batten plate and the end plate are included, bolt holes are formed in the end plate, and the end plates are connected together through bolts between the lattice type prefabricated standard section.
Optionally, the assembled suspended section can be independently used as a stand column of a flat support.
Alternatively, the coaxial expanded section can be used alone as an engineered pile for vertically supporting a building or structure.
The lattice type force-bearing frame comprises centripetal longitudinal lattices parallel to a longitudinal axis and transverse lattices not parallel to the longitudinal axis: the longitudinal grids are distributed on the periphery of the longitudinal axis in parallel, the cross section is triangular, rectangular, polygonal, trapezoidal, T-shaped, L-shaped, circular or annular, the materials are steel materials or steel-concrete composite materials, the length of the extension line of the cross section of the centripetal finger longitudinal grid in the long side direction is shortest with the longitudinal axis, namely the width of the surface of the longitudinal grid facing the center of the cross section of the lattice type force-bearing frame is shortest; the transverse grid is connected with the intersected longitudinal grid to provide stability for the longitudinal grid, and the cross section of the transverse grid is rectangular or round or T-shaped or L-shaped, and the transverse grid is made of steel bars or steel plates or section steel.
The coaxial slurry is arranged to be coaxial and concentric with the lattice type force-bearing frame or the coaxial expansion body assembled type support, and is made of cement soil, cement body or concrete cylinder, and the coaxial slurry is made of rotary spraying equipment penetrating through the hollow pore canal of the assembled prefabricated standard section from the ground, namely a high-pressure rotary sprayer sprays cement slurry, and the cement soil slurry formed by cutting and stirring undisturbed soil in and around the lattice type force-bearing frame is solidified. The end of the lattice type force-bearing frame close to the ground is called a first end, the end far away from the ground is called a second end, and the first end is connected with the suspension section or the transition section. The centripetal arrangement of the longitudinal grid of the lattice type force-bearing frame reduces the blocking range of the longitudinal grid to high-pressure injection and increases the effective coverage of coaxial slurry.
Furthermore, the second end of the lattice type force-bearing frame is additionally provided with a conical end, the conical end is solid, the front end is sharp, and the material is steel or concrete or steel-concrete composite material.
Optionally, the conical end is configured in a lattice form and comprises a physical lattice, a side wall hole and a conical end hole, wherein the side wall hole is arranged on the conical surface of the lattice form conical end and is configured as a reflux channel of fluid (comprising soil slurry and cement soil slurry); the cone end hole is arranged at the cone tip of the lattice type cone end (namely, the cone tip of the cone end becomes a hole) and is arranged as a jet channel of a high-pressure jet flow, and the high-pressure jet flow is high-pressure water flow or high-pressure (cement) slurry flow or air flow; the physical lattice is a body or a entity of the lattice type conical end.
Optionally, a transition section is additionally arranged between the lattice type bearing frame and the suspension section, the suspension section and the lattice type bearing frame are connected, the pit bottom elevation and the foundation slab are arranged in the range of the transition section, the transition section is made of a permanent pipe body, and the material is concrete, steel or steel-concrete composite material.
The lattice type force-bearing frame and the prefabricated standard sections are directly placed into soil section by a set construction device, or holes are firstly led in advance at preset positions by the set construction device, and then the lattice type force-bearing frame and the prefabricated standard sections are placed into the soil section by section. In any way, the conical end of the lattice type force-bearing frame is the requisite arrangement for expanding the pore canal in the soil body, so that the interior of the lattice type force-bearing frame is hollow or partially hollow, even if soft soil or sandy soil is partially reduced in diameter or collapses, the interior of the lattice type force-bearing frame is at least partially hollow, and the subsequent rotary spraying process is simpler and more effective; under the hole guiding working condition, the conical end of the lattice type force-bearing frame has a guiding function, and after construction is completed, the coaxial expansion assembly type support starts to bear load, and the conical end can directly prop against soil body to provide end resistance. Thus, the tapered end is a multi-functional member.
Optionally, the conical end at the second end of the lattice type force-bearing frame is set to be a lattice type, the rotary nozzle of the rotary spraying device is arranged in the conical end hole of the lattice type conical end, the high-pressure jet water flow or slurry flow (fluid) cuts soil in front of the lattice type conical end through the conical end hole, the reflux slurry (fluid) flows out through the side wall hole to form a hole as a guiding hole, a channel is provided for placing the lattice type force-bearing frame and the assembled standard section, or the resistance of placing is reduced. Namely, high-pressure injection (rotary injection) and the placement of the lattice type bearing frame and the assembled standard section are simultaneously carried out, so that the work efficiency is improved. After the lattice type force-bearing frame and the assembled standard section are placed in the set positions, the rotary nozzle of the rotary spraying device starts to retract outwards from the hole, and the soil body in or around the lattice type force-bearing frame is cut and stirred by high-pressure jet flow of cement paste to form coaxial slurry.
The lattice type conical end is a necessary component for hole guiding of the rotary spraying equipment, has the function which the solid type conical end does not have, and blocks soil in front of the conical end from being cut by the solid of the solid type conical end.
The coaxial slurry is formed by constructing a conventional jet grouting pile machine, a drill rod of the jet grouting pile machine is used as a force transmission component for rotating a power head of the pile machine and is also used as a conveying channel of cement slurry, the drill rod penetrates through the hollow channel of the prefabricated standard section to reach the inner side of the conical end of the second end of the lattice type force-bearing frame, the inner space of the lattice type force-bearing frame starts jet grouting, the original soil around the lattice type force-bearing frame and the residual soil in the inner space are cut by high-pressure jet flow, cement slurry is formed by stirring with cement slurry, and the coaxial slurry is formed after the slurry is solidified.
Optionally, the lattice type force-bearing frame and the assembled standard section are placed in a set position, after the rotary spraying device is placed in the hollow duct, the first end of the lattice type force-bearing frame starts to move towards the second end and carries out rotary spraying expansion, after reaching the second end, the second rotary spraying expansion is carried out, and the slurry is solidified to form the coaxial slurry.
Further, the coaxial slurry is manufactured by construction of a shaftless rotary sprayer. The shaftless rotary sprayer adopts the following technical scheme:
the shaftless rotary sprayer is not provided with a drill rod and a rotating shaft (shaftless and drill rod are called shaftless for short), only a soft high-pressure flow conveying pipe (the flow conveying is liquid and gas, and the liquid and the flow are called together), and no special power is provided, namely a rotary spraying pile machine is not provided. The shaftless rotary sprayer is characterized in that the rotary spraying power is derived from the rotary power brought by the flow direction setting of the fluid, namely the rotary power is derived from a grouting pump, and the grouting pump is a necessary device of a conventional rotary spraying pile machine.
Compared with the conventional jet grouting pile machine, the shaftless jet grouting machine saves the jet grouting pile machine, saves drill rods, and greatly reduces construction cost; moreover, compared with the complicated frequently connection and disconnection of the drill rod of the conventional jet grouting pile machine, the construction speed and the construction convenience of the shaftless jet grouting device are greatly improved; and moreover, the flow hose of the shaftless rotary sprayer can be bent, so that the shaftless rotary sprayer can finish a curve (and a rotary spraying channel or path can turn) rotary spraying construction process which cannot be finished by a conventional rotary spraying pile machine.
The shaftless rotary sprayer comprises a stator fluid conveyer and a rotor sprayer which are communicated into a whole and can rotate relatively, the rotor is arranged to rotate along a longitudinal axis, and the stator is arranged not to rotate along the longitudinal axis. The longitudinal axis is the longitudinal axis of the shaftless rotary sprayer.
The stator flow conveyer is a fixed and non-rotating component, the inside of the stator flow conveyer is hollow and externally connected with a high-pressure flow conveyer pipe, and the flow conveyer is used for conveying fluids such as liquid or gas. The section shape of the stator current conveyor is square, round, polygonal and the like.
The rotor ejector, the section shape be circular, inside cavity and be provided with defeated flow duct and high pressure jet, the rotation power setting of rotor ejector, include the following mode: the rotor ejector is internally provided with a spiral flow delivery channel (the same as the built-in spiral blade), and fluid drives the rotor ejector to rotate when passing through; or the rotor injector is provided with two fluid injection ports, the outflow direction of the injection ports deviates from the radial line direction of the circle center of the circular section to the periphery, the injection lines of the high-pressure injection streams are parallel and symmetrically distributed on the two sides of the circle center of the circular section at set intervals, and the rotor injector is driven to rotate by virtue of a couple formed by the recoil force of the two high-pressure injection streams; alternatively, the rotor injector is provided with inclined blades (corresponding to turbine blades) symmetrically relative to the longitudinal axis, i.e. with external back flow driving blades, and the rotor injector is driven to rotate by the back flow slurry outside the rotor injector body. The above modes can be adopted singly or in combination.
The shaftless rotary sprayer has an automatic forward function due to the forward impulsive force of high-pressure fluid.
Further, the high-pressure jet ports of the rotor injector are arranged in pairs on the end face of the front end of the rotor injector and are arranged at a preset jet angle, the direction of the high-pressure jet flow is inclined to the longitudinal axis and mutually intersected, and the jet, cutting and stirring processes of the front end and the periphery can be completed simultaneously.
Furthermore, the shaftless rotary sprayer is used for constructing and manufacturing a horizontal high-pressure jet rotary sprayer body deep in a soil body and is used for pit bottom reinforcement or pit bottom flat support of a foundation pit support. When the conventional jet grouting pile machine is used for constructing and manufacturing a horizontal jet grouting body, a large pit is required to be excavated to hoist the jet grouting pile machine into the pit because of a drill rod which cannot be bent, and complex procedures such as precipitation, foundation pit support and the like are involved.
The technology is extremely simple, no precipitation and support are needed, only a vertical steel pipe or a solid pile is needed to be driven into soil to form a vertical hole (a pile hole of an engineering pile can be utilized), a guide is arranged in the vertical hole, the guide is arranged into a cylinder body (namely a pipe body) or a lattice (or a rib body) and is provided with a set steering angle, the rear end of the shaftless rotary sprayer is connected with an elastic positioner, the elastic positioner is arranged into the pipe body or the rib body and is made of high-elasticity steel, the elastic positioner can be bent and kept straight, and under the assistance of the guide, the shaftless rotary sprayer is arranged into the vertical hole of the soil to complete horizontal steering, and the shaftless rotary sprayer can be used for constructing and manufacturing a horizontal high-pressure rotary sprayer.
Furthermore, the shaftless rotary sprayer is used as hole guiding equipment, or a rotary spraying anchor rod or a precast concrete engineering pile in a construction foundation pit enclosure is positioned by a rigid positioner, and the lattice type conical end is used for manufacturing high-pressure jet hole guiding or coaxial slurry. The rigid positioner is arranged as a pipe body (the pipe body can be used for positioning measures of other processes at the same time), or is arranged as a rib body (the pipe body can also be used as a rib body in the anchor rod at the same time). Compared with the conventional jet grouting pile machine, the construction speed and the construction convenience of the shaftless jet grouting machine are greatly improved because the drill rod is not required to be frequently installed and detached and pile machine equipment is omitted. The rigid locator material is steel, concrete or a steel-concrete composite material.
Furthermore, the rigid positioner constructed by the shaftless rotary sprayer is vertically arranged in soil and used as a positioning rod of the cement soil wall with the same thickness, and is called a ground positioning rod. The soil-setting positioning rod is vertically arranged at the end part of the soil cement wall forming device and provides positioning and guiding functions for downward movement construction of the soil cement wall forming device, the end part of the soil cement wall forming device is provided with a U-shaped end or an annular end, and the soil cement wall forming device is clamped on the soil-setting positioning rod to limit the position deviation of the soil cement wall forming device along the longitudinal or transverse horizontal direction.
Optionally, the positioning rod can be used for assisting hole guiding by other mechanical equipment and sinking by adopting a shaftless rotary sprayer.
Optionally, the cement soil wall forming device adopts a non-mast wheel stirrer, the non-mast wheel stirrer adopts a suspended wheel stirrer, and the positioning and guiding control are performed by utilizing a ground positioning rod which is arranged in advance.
Optionally, the cement soil wall forming device adopts a box type combined shaftless rotary sprayer, the box type combined shaftless rotary sprayer adopts a suspension type, the cement soil wall forming device comprises a box type outer barrel and a group of (one or more) shaftless rotary sprayers arranged in the outer barrel, the shaftless rotary sprayers are arranged on a horizontal sliding rod in the outer barrel through a rotating shaft, can horizontally slide along the sliding rod and can rotate around the rotating shaft according to a preset angle, the horizontal sliding and the rotating are realized by a direction controller connected to the shaftless rotary sprayers, the direction controller is communicated to the natural ground and controlled on the ground, and the direction controller is arranged as a mechanical traction rope or a fluid control tube. The outer cylinder has a plurality of functions: providing a free moving space for the shaftless rotary sprayer; ensuring and checking the cutting range of the shaftless rotary sprayer; as a base or support for a shaftless rotary sprayer. The horizontal section of the box-type outer cylinder is rectangular, circular or annular, the section sizes of the sliding rod and the rotating shaft are circular or annular, and the box-type outer cylinder, the sliding rod and the rotating shaft are made of steel materials.
Furthermore, the traction ropes are symmetrically arranged at two sides of the shaftless rotary sprayer and are arranged in a closed ring shape, so that the shaftless rotary sprayer has the functions of adjusting the position and the spraying direction of the shaftless rotary sprayer and can simultaneously identify and position the horizontal position of the shaftless rotary sprayer on the ground; the fluid control pipes are symmetrically arranged at two sides of the shaftless rotary sprayer, and the horizontal sliding direction and the rotating direction of the shaftless rotary sprayer are controlled by alternately injecting fluid into the shaftless rotary sprayer.
To date, the two main forms of the existing equal-thickness cement soil wall are large in bodywork and high-rise towers or masts, which make the equipment heavy and high in cost, and the stability of the high-rise equipment also brings safety problems in the construction process, on the other hand, the two-wheel slot milling machine is difficult to use when the operation space is limited near under high-voltage wires or under bridges, buildings and the like, and the two-wheel slot milling machine adopts a suspended bodywork (no masts), but the cost is three times as high as that of the two-wheel stirring equipment with masts due to the complex sensing and positioning adjustment system in the two-wheel slot milling machine. Therefore, the mast of the double-wheel stirring equipment is cancelled, the function of the ground positioning rod is replaced, and the suspended non-mast wheel stirrer (wheel type stirring equipment) is adopted, so that the manufacturing cost of the double-wheel stirring equipment can be reduced, and the double-wheel stirring equipment can be conveniently used for construction in a limited space, and the convenience in use and the application range of the double-wheel stirring equipment are improved.
Furthermore, the shaftless rotary sprayer can be formed by injection molding of high-strength plastics, and the price is low enough to be used as a disposable product, so that the cost of the box type combined shaftless rotary sprayer is lower than that of the shaftless rotary sprayer, and the shaftless rotary sprayer can be remained in underground soil after disposable use.
Further, at least two positioning rods are connected into a whole to form a lattice type or truss type enclosure structure, and the lower end of the enclosure structure is provided with a box type combined shaftless rotary sprayer which is sunk to a preset depth together to form a foundation pit enclosure wall together with cement soil. The flow conveying pipe is directly connected with the ground or is replaced by a ground positioning rod.
The invention discloses a construction method of a coaxial expansion body assembly type support, which comprises the following steps:
the first step: manufacturing a prefabricated standard section, manufacturing a lattice type bearing frame at the same time, and transporting to a construction site;
and a second step of: positioning on site, and guiding holes by mechanical equipment at a preset coaxial expansion body assembly type supporting position;
and a third step of: erecting a positioning frame, connecting a lattice type bearing frame or a transition section with a first prefabricated standard section, and hoisting and placing the lattice type bearing frame or the transition section into a guide hole;
fourth step: connecting the second prefabricated standard section with the first prefabricated standard section, and continuing to put in the first prefabricated standard section, and repeating the steps until reaching a preset position deep in the soil body;
Fifth step: and inserting a drill rod of a conventional jet grouting pile machine into the hollow duct of the prefabricated standard section to a preset depth, or placing a shaftless jet grouting device to a preset depth, and starting cement paste or water jet grouting expansion until the completion.
The invention relates to a construction method of a coaxial expansion body assembly type support of a rotary spraying guiding hole imbedding support, which comprises the following steps:
the first step: simultaneously manufacturing a prefabricated standard section and a lattice type bearing frame, and transporting to a construction site;
and a second step of: in-situ positioning, placing a lattice type bearing frame with a lattice type conical end at a set position, installing a shaftless rotary sprayer with a guide rope (a steel wire rope and the like) in a conical end hole of the conical end, passing a high-pressure flow hose through a longitudinal pore canal in the lattice type bearing frame, and connecting a grouting pump;
and a third step of: starting a grouting pump, taking a lattice type force-bearing frame as a guide frame, starting high-pressure rotary spraying, and simultaneously assisting in pushing the lattice type force-bearing frame into soil by mechanical equipment according to conditions;
fourth step: when the lattice type bearing frame is about to completely enter soil, installing and connecting a first prefabricated standard section, continuously performing rotary spraying jacking, and sequentially and circularly installing a next prefabricated standard section until all prefabricated standard sections are placed;
Fifth step: and (3) pulling the shaftless rotary sprayer to retract by using the guide rope, and continuously rotary spraying cement slurry in the lattice type force-bearing frame until reaching the first end of the lattice type force-bearing frame, so as to finish the construction of the coaxial slurry.
The invention discloses a construction method of an equal-thickness cement soil wall, which comprises the following steps:
the first step: setting a positioning facility on the ground, arranging a ground positioning rod body with a shaftless rotary sprayer and a lattice type conical end at the lower end of a first section, arranging soil bodies by using the shaftless rotary sprayer and ensuring verticality, installing a second section of ground positioning rod body, and repeating the steps to finish the construction of the ground positioning rod, wherein mechanical equipment can be used for leading holes to improve the construction efficiency when necessary;
and a second step of: after two preset floor positioning rods are constructed in place, a guide groove is excavated between the two floor positioning rods, a cement soil wall forming device is hung into the guide groove, and U-shaped ends at two ends of the wall forming device are clamped with the floor positioning rods;
and a third step of: starting a cement soil wall forming device, cutting and stirring soil at the lower part of the cement soil wall forming device to form a sinking space, lifting and continuously spraying cement slurry when the cement soil wall forming device reaches a preset depth, stirring to form a first cement soil groove, and sequentially constructing next cement soil grooves at intervals to finish a first cement soil wall which is arranged at intervals;
Fourth step: and (3) pulling out the ground positioning rod, and constructing a second batch of cement soil walls at intervals sequentially by taking adjacent cement soil grooves which are arranged at intervals of the first batch as positioning and guiding grooves before cement soil slurry of the first batch of cement soil walls is solidified, so that the cement soil walls with the same thickness are formed completely.
The construction method of the foundation pit enclosure wall comprising the enclosure structure and the cement soil wall with the equal thickness comprises the following steps:
the first step: manufacturing an integral enclosure structure comprising a plurality of ground positioning rods, and connecting a box-type combined shaftless rotary sprayer at the lower end of the enclosure structure;
and a second step of: excavating a guide groove at a preset site, arranging an integral type enclosing structure, installing a guide positioning frame of the integral type enclosing structure, starting a grouting pump to start high-pressure rotary water spraying or cement soil slurry, and sinking the enclosing structure along a space cut by the box type combined shaftless rotary sprayer under the action of the dead weight of the enclosing structure or external auxiliary mechanical equipment;
and a third step of: and the enclosure structure reaches a preset embedding depth (whether the shaftless rotary sprayer is taken out or not is determined according to the situation), and the construction of the enclosure wall is completed.
Compared with the prior art, the invention has the following advantages:
1. The prefabricated standard section of coaxial expansion body assembled support can be reused, and the cost is reduced.
2. Compared with the diagonal bracing with the same diameter, the lattice type force-bearing frame ensures that the diameter of the coaxial slurry sprayed by the coaxial rotary spraying is far larger than that of the prefabricated standard section, and the bearing capacity of the components of the prefabricated standard section of the suspended section and the bearing capacity of the soil body of the coaxial expanded section are exerted to reasonable levels at the same time, so that the waste of materials is reduced, and the effective utilization of the materials is improved.
3. Compared with the construction of the front-mounted cement soil, the construction process of coaxial rotary spraying is adopted for the rear-mounted coaxial slurry, so that the coincidence degree of the coaxial slurry and the longitudinal axis of the lattice type bearing frame is higher, and the construction quality of the coaxial expansion section is easier to ensure and improve.
4. The lattice type bearing frame and the coaxial slurry bear together, so that the material cost is reduced, the diameter of the coaxial expansion body is obviously enlarged, the soil bearing capacity of the coaxial expansion body section is improved at low cost, the spacing of the front inclined struts is enlarged, and even the spacing is twice as much as that of the prior art, the improvement ensures that the earthwork excavation of a foundation pit is more convenient, and the defect is one of the biggest defects of the front inclined struts originally, and the technology of the invention is adopted to solve or even change the defect into the advantage.
5. Compared with the construction process of the conventional jet grouting pile machine, the shaftless jet grouting device not only saves mechanical equipment such as the jet grouting pile machine and reduces construction cost, but also has the characteristic that the shaftless jet grouting device does not need to install and disassemble a jet grouting drill rod, so that the high-pressure jet grouting process is quick and convenient, and the horizontal jet grouting column body such as a pit bottom flat support can be simply constructed, and unprecedented progress is brought to foundation treatment and foundation pit support.
6. The lattice type bearing frame and the prefabricated standard section are placed by utilizing the auxiliary pore-forming technology of the shaftless rotary sprayer, and the construction of coaxial slurry is completed simultaneously, so that pore-leading equipment is saved, and the construction speed and efficiency are improved.
7. The shaftless rotary sprayer is used for manufacturing the ground positioning rod, so that the cement soil wall forming device can save the cost of equipment and can finish cement soil wall construction under complex conditions; the box type combined shaftless rotary sprayer can be used for replacing expensive wheel stirring equipment to construct cement soil walls with equal thickness, and foundation pit enclosure walls can be constructed.
Drawings
FIG. 1 is a longitudinal cross-sectional view of the overall structure of the coaxial spread body fabricated support of the present invention.
Fig. 2 is a longitudinal cross-sectional view of the overall structure of the coaxial spread body assembled support of the present invention employing lattice-type prefabricated standard sections.
Fig. 3 is a cross-sectional view of a solid prefabricated standard section of the present invention.
Fig. 4 is a cross-sectional view of a lattice-type prefabricated modular segment according to the present invention.
Fig. 5 is a cross-sectional view of a coaxial spread section of the present invention.
FIG. 6 is a longitudinal cross-sectional view of the present invention in the form of a pre-formed standard segment limit outer barrel latch connection.
FIG. 7 is a longitudinal cross-sectional view of the present invention in the form of a preform standard section spacing inner barrel bolt connection.
Fig. 8 is a longitudinal cross-sectional view of a shaftless rotary sprayer provided with a spiral flow duct according to the present invention.
Fig. 9 is a cross-sectional view of a rotor injector of the present invention provided with parallel offset high pressure jets.
Fig. 10 is a longitudinal section of a rotor injector of the present invention provided with external return drive vanes.
FIG. 11 is a side elevational view of a rotor injector of the present invention provided with external return drive vanes.
Fig. 12 is a side elevational view of a rotor injector of the present invention provided with end-face parallel offset intersecting high pressure jets.
FIG. 13 is a vertical cross-section of a horizontal high pressure jet grouting body of the shaftless jet grouting device of the present invention in an underground construction.
Fig. 14 is a vertical cross-section of the present invention utilizing a shaftless rotary sprayer pilot or construction anchor.
Fig. 15 is a front elevation view of the lattice-shaped tapered end of the second end of the lattice-shaped load-carrying bracket of the present invention.
FIG. 16 is a longitudinal cross-sectional view of the present invention showing the positional relationship between a cross-ribbed retention knob and a preformed standard segment.
FIG. 17 is a vertical cross-section of the present invention for constructing an equal thickness cemented soil wall using a floor positioning rod.
FIG. 18 is a horizontal cross-sectional view of the present invention for constructing an equal thickness cemented soil wall using the floor positioning rods.
FIG. 19 is a vertical cross-section of a box-type combined shaftless rotary sprayer construction equal thickness cement-soil wall of the present invention.
Reference numerals:
the device comprises a 1-hanging section, a 11-prefabricated standard section, 111-longitudinal angle steel, 112-transverse lacing plates, 12 connecting joints, 121-limiting outer cylinder bolts, 122-bolts, 123-through steel bolts, 124-transverse ribs, 131-limiting inner cylinder bolts and 14-end plates; 2-coaxial expanded sections, 21-coaxial slurry, 22-transition sections, 23-lattice type bearing frames, 231-longitudinal lattices and 232-transverse lattices; 24-tapered end; 3-pit bottom soil body; 4-shaftless rotary jet, 41-stator fluid delivery, 411-fluid, 412-fluid delivery pipe, 42-rotor jet, 421-spiral duct, 422-jet orifice, 423-external reflux driving blade, 43-high pressure jet, 44-reflux slurry and 45-rotor jet section circle center; 5-elastic positioners; 6-a guide; 7-a rigid locator; 8-lattice type conical end, 81-solid lattice, 82-side wall hole and 83-conical end hole; 9-cement soil wall forming device, 90-box type combined shaftless rotary sprayer, 91-ground positioning rod, 92-cement soil, 931-U-shaped end, 932-box type outer cylinder, 933-slide bar, 94-rotation shaft, 95-steering shaft and 951-direction controller.
Detailed Description
In order to make the technical contents of the present invention more clearly understood, the following examples are specifically described.
Referring to fig. 1 to 19, the assembled coaxial expander support includes a suspension section 1 and a coaxial expander section 2, a transition section 22 is additionally arranged between the suspension section 1 and the coaxial expander section 2 according to requirements, a pit bottom soil body 3 is arranged in the range of the transition section 22, the suspension section 1 includes a prefabricated standard section 11 and a connection joint 12, the prefabricated standard section 11 is arranged as a hollow pipe body, the connection joint 12 is arranged as a limit outer cylinder bolt 121 or a limit inner cylinder bolt 131, a bolt 122 or a through steel bolt 123 is connected with the prefabricated standard section 11 and the limit outer cylinder bolt 121, or the bolt 122 or the through steel bolt 123 is connected with the prefabricated standard section 11 and the limit inner cylinder bolt 131, or the limit outer cylinder bolt 121 and the limit inner cylinder bolt 131 are provided with a transverse rib 124, and the sliding of the cylinder bolt along the longitudinal axis is limited; optionally, the wall of the pipe body of the prefabricated standard section 11 is provided with a lattice, and the lattice comprises a longitudinal angle steel 111, a transverse batten plate 112 and an end plate 14, wherein the end plate 14 is provided with a bolt hole, and the lattice type prefabricated standard sections 11 are connected together through bolts 122; the coaxial expansion section 2 comprises a coaxial slurry 21 and a lattice type bearing frame 23, the lattice type bearing frame 23 comprises a centripetal longitudinal lattice 231 and a transverse lattice 232, the end part of the lattice type bearing frame is additionally provided with a conical end 24, and the coaxial slurry 21 is coaxial and concentric with the lattice type bearing frame 23, is made of cement soil, cement body or concrete, and is made of rotary spraying equipment penetrating through a hollow duct of the prefabricated standard section 11.
The rotary spraying equipment adopts conventional equipment, and can also adopt a shaftless rotary sprayer 4, wherein the shaftless rotary sprayer 4 comprises a stator flow conveyer 41 and a rotor sprayer 42, and the stator flow conveyer 41 is externally connected with a high-pressure flow conveyer 412. The rotor injector 42 is hollow and provided with a flow passage and a high pressure injection port 422, and the rotation of the rotor injector 42 is provided by: the rotor injector 42 is internally provided with a spiral duct 421 for conveying flow, and the rotor injector 42 is driven to rotate when fluid passes through; alternatively, the rotor injector 42 is provided with two high-pressure injection ports 422, the injection ports 422 deviate from the radial line of the rotor injector section circle center 45 to the periphery, the injection lines of the two high-pressure jet streams 43 are parallel, symmetrically arranged at two sides of the rotor injector section circle center 45 at a set distance, and the rotor injector 42 is driven to rotate by a couple formed by the recoil force of the two high-pressure jet streams 43; alternatively, the rotor ejector 42 is provided externally with inclined external return drive vanes 423 symmetrically about the longitudinal axis, which in turn drive the rotor ejector 42 by means of return slurry 44 outside the rotor ejector 42.
The method comprises the steps of constructing a horizontal rotary spraying body on the natural ground by adopting a shaftless rotary sprayer 4, constructing a vertical hole on the ground, arranging a guide 6, connecting an elastic positioner 5 at the rear end of the shaftless rotary sprayer 4, arranging the shaftless rotary sprayer 4 into a vertical hole in a soil body by using the elastic positioner 5 under the assistance of the guide 6, and completing horizontal turning, and constructing and manufacturing the horizontal rotary spraying body by using the shaftless rotary sprayer 4.
The shaftless rotary sprayer 4 is used as hole guiding equipment, or a rotary spraying anchor rod or a precast concrete engineering pile in a construction foundation pit enclosure is positioned by a rigid positioner 7, and the lattice type conical end 8 is used for manufacturing high-pressure spraying hole guiding or coaxial slurry 21. The lattice type conical end 8 comprises a solid lattice 81, a side wall hole 82 and a conical end hole 83, wherein the side wall hole 82 is formed in the conical surface of the lattice type conical end 8, and the conical end hole 83 is formed in the conical tip of the lattice type conical end 8.
The rigid positioner 7 is vertically arranged in soil and used as a positioning rod for constructing a cement soil wall with equal thickness, namely a built-in positioning rod 91, is vertically arranged in a U-shaped end 931 at the end part of the cement soil wall forming device 9 and provides positioning and guiding functions for the downward movement of the cement soil wall forming device 9, and limits the position deviation of the cement soil wall forming device 9 along the longitudinal or transverse horizontal direction and stirs construction cement soil 92.
Further, the soil cement wall forming device 9 is configured as a box type combined shaftless rotary sprayer 90, the box type combined shaftless rotary sprayer 90 comprises a box type outer barrel 932 and a group of shaftless rotary sprayers 4 arranged in the outer barrel, the group of shaftless rotary sprayers 4 are arranged on a horizontal sliding rod 933 in the box type outer barrel 932 through a rotating shaft 94, the horizontal sliding and the rotating can rotate around the rotating shaft 94 according to a preset angle along the sliding rod 933, the horizontal sliding and the rotating are realized by a direction controller 951 connected to the shaftless rotary sprayers 4, the direction controller 951 bypasses the rotating shaft 95 to be communicated to the natural ground, and the horizontal position and the spraying direction of the shaftless rotary sprayers 4 are controlled on the ground.
Example 1
The first step: manufacturing a prefabricated standard section and transporting to a construction site;
and a second step of: driving a concrete precast pile into the position of a supported upright post to serve as an upright post pile, when the pile top of the precast pile is positioned at a set position on the upper part of the natural ground elevation, installing a limiting outer cylinder bolt or a limiting inner cylinder bolt at the upper end of the precast pile, hoisting a first section of precast standard section, sleeving the limiting outer cylinder bolt or sleeving the limiting inner cylinder bolt, determining whether to install a bolt according to the existence of a transverse rib of the limiting cylinder bolt, and repeatedly installing a second section of precast standard section according to the repetition;
and a third step of: constructing a first cast-in-place concrete flat support or installing an assembled precast concrete flat support at the tail end of the upper part of the uppermost precast standard section, excavating earthwork to a second flat support position, constructing and installing the second flat support by using a reserved steel member outside the limiting cylinder bolt as a support, and repeatedly installing the flat support;
fourth step: and excavating the earthwork of the foundation pit to the bottom, pouring a foundation slab, removing the lowest flat support, repeating the steps, removing the uppermost flat support, removing the prefabricated standard section of the hanging upright post, and transporting to the next foundation pit engineering for recycling.
Example 2
The first step: manufacturing a vertical hole in a soil body or utilizing the vertical hole left by an engineering pile, arranging a guide device in the hole, and connecting an elastic positioner at the tail end of the shaftless rotary sprayer;
And a second step of: after passing through the guide, the shaftless rotary sprayer and the elastic positioner bend horizontally with the aid of the guide, the high-pressure grouting pump is started, and the shaftless rotary sprayer is started to start rotary spraying;
and a third step of: after the shaftless rotary sprayer reaches a preset position, continuously rotary spraying cement paste while retracting to form a horizontal rotary spraying body;
fourth step: and withdrawing the elastic positioner and the shaftless rotary sprayer, taking out the guide device, completing the construction, and continuing the construction of the next horizontal rotary sprayer.
Example 3
The first step: digging a groove, constructing a guide hole on the groove wall, and connecting a rib body rigid positioner at the tail end of the shaftless rotary sprayer;
and a second step of: placing the shaftless rotary sprayer and the rib rigid positioner into the guide hole, starting the high-pressure grouting pump, and starting the shaftless rotary sprayer to start rotary spraying;
and a third step of: after the shaftless rotary sprayer reaches a preset position, the tendon rigid positioner is remained in the hole, and cement paste is continuously rotary sprayed while retracting, so that a horizontal rotary spraying anchor rod is formed, and the shaftless rotary sprayer can be remained in the hole according to the situation.
The assembled support and the shaftless rotary sprayer provided by the invention are environment-friendly, shorten the construction period, facilitate construction, reduce the cost, improve the construction quality, have obvious unexpected improvements in the aspects of economy, convenience, social beneficial performance and the like compared with the prior art, have more obvious and outstanding social benefit and economic benefit, and further promote the industrial upgrading of foundation pit engineering.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent, however, that various modifications and changes may be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (12)
1. The coaxial expansion body assembled support is characterized by comprising a suspension section and a coaxial expansion body section, wherein the suspension section is arranged as a prefabricated standard section, the coaxial expansion body section is arranged below pit bottom soil body and between pit bottom soil body and an enclosure structure, the coaxial expansion body section comprises a lattice type bearing frame and a coaxial slurry body, the lattice type bearing frame coincides with the longitudinal axis of the coaxial slurry body, and the coaxial expansion body assembled support is arranged as an inclined strut of a foundation pit support or an upright column of a foundation pit support flat strut;
the coaxial slurry is a cement soil solidification body and coats the lattice type bearing frame;
the lattice type force-bearing frame comprises centripetal longitudinal lattices parallel to a longitudinal axis and transverse lattices not parallel to the longitudinal axis, the longitudinal lattices are distributed on the periphery of the longitudinal axis in parallel, the transverse lattices are connected with the longitudinal lattices which are intersected with the longitudinal lattices, stability is provided for the longitudinal lattices, and the centripetal arrangement of the longitudinal lattices increases the effective coverage range of the coaxial slurry; the cross section of the centripetal finger is rectangular, T-shaped and L-shaped, and the length of the extension line of the cross section of the longitudinal grid in the long side direction is shortest from the longitudinal axis, so that the blocking of the longitudinal grid to high-pressure injection is reduced;
The coaxial slurry is set to be cement soil coaxial with the lattice type force-bearing frame, and cement soil slurry formed by cutting and stirring soil in and around the lattice type force-bearing frame is solidified by high-pressure jet flow sprayed by rotary spraying equipment penetrating through a hollow pore canal of the prefabricated standard section.
2. The coaxial spread body assembled support according to claim 1, wherein the suspended section is provided with an assembled structure and comprises a prefabricated standard section which can be recycled, the prefabricated standard section is provided with a hollow pipe body, the pipe wall of the hollow pipe body is provided with a solid or lattice type, the inside of the hollow pipe body is provided with a pore canal extending along the longitudinal axis direction of the pipe body, and the pore canal penetrates through the longitudinal axis of the coaxial spread body assembled support and is communicated with the lattice type bearing frame;
the prefabricated standard section is in an assembled connection mode, the assembled connection mode is based on a limiting outer cylinder bolt or a limiting inner cylinder bolt, the limiting outer cylinder bolt is arranged into a cylinder body, the limiting outer cylinder bolt is wrapped outside the prefabricated standard section at the joint position of the prefabricated standard section, the inner wall of the limiting outer cylinder bolt is matched with the outer wall of the prefabricated standard section and is partially overlapped with the adjacent two prefabricated standard sections respectively, the limiting outer cylinder bolt is coaxial with the prefabricated standard section and is connected with the prefabricated standard section through a steel bolt arranged in the direction vertical to the longitudinal axis, and the limiting outer cylinder bolt is arranged to limit the adjacent prefabricated standard section from dislocating or bending along the direction vertical to the longitudinal axis of the prefabricated standard section;
The limiting inner cylinder bolt is arranged as a cylinder body, the limiting inner cylinder bolt is embedded in the prefabricated standard section at the joint position of the prefabricated standard section, the outer wall of the limiting inner cylinder bolt is matched with the inner wall of the prefabricated standard section and is partially overlapped with the adjacent two prefabricated standard sections respectively, the limiting inner cylinder bolt is coaxial with the prefabricated standard sections and is connected with the prefabricated standard sections through steel bolts arranged in the direction vertical to the longitudinal axis, and the limiting inner cylinder bolt is arranged to limit the adjacent prefabricated standard sections from dislocating or bending along the direction vertical to the longitudinal axis of the prefabricated standard sections;
the limiting outer cylinder bolt and the limiting inner cylinder bolt are connected with a transverse rib in a plane perpendicular to the longitudinal axis, the transverse rib is arranged between the ends of the adjacent prefabricated standard sections, and the transverse rib prevents the limiting outer cylinder bolt or the limiting inner cylinder bolt from sliding along the longitudinal axis direction:
the coaxial expansion section is independently used as an engineering pile for supporting a building or a structure.
3. The coaxial spread body assembly type support according to claim 1, wherein,
the coaxial slurry is formed by construction of a jet grouting pile machine or by construction of a shaftless jet grouting device.
4. The coaxial expanded body assembled support according to claim 3, wherein the shaftless rotary sprayer is of a structure without a drill rod and a rotary jet pile machine, the tail end of the shaftless rotary sprayer is connected with a flow transmission hose, the rotation power of the shaftless rotary sprayer is brought by utilizing the flow direction setting of fluid, and the shaftless rotary sprayer automatically forwards under the action of the forward impact force of high-pressure fluid, and the shaftless rotary sprayer is used for hole guiding or rotary jet body construction.
5. A method of constructing the coaxial expanded body fabricated support according to any one of claims 1 to 4, comprising the steps of:
the first step: manufacturing a prefabricated standard section, manufacturing a lattice type bearing frame at the same time, and transporting to a construction site;
and a second step of: positioning on site, and guiding holes by mechanical equipment at a preset coaxial expansion body assembly type supporting position;
and a third step of: erecting a positioning frame, connecting a lattice type bearing frame or a transition section with a first prefabricated standard section, and hoisting and placing the lattice type bearing frame or the transition section into a guide hole;
fourth step: connecting the second prefabricated standard section with the first prefabricated standard section, and continuing to put in the first prefabricated standard section, and repeating the steps until reaching a preset position deep in the soil body;
Fifth step: and inserting a drill rod of a conventional jet grouting pile machine into the hollow duct of the prefabricated standard section to a preset depth, or placing a shaftless jet grouting device to a preset depth, and starting cement slurry jet grouting expansion until the completion.
6. A method of constructing the coaxial expanded body fabricated support according to any one of claims 1 to 4, comprising the steps of:
the first step: simultaneously manufacturing a prefabricated standard section and a lattice type bearing frame, and transporting to a construction site;
and a second step of: in-situ positioning, placing a lattice type bearing frame with a lattice type conical end at a set position, installing a shaftless rotary sprayer with a guide rope in a conical end hole of the conical end, passing a high-pressure flow hose through an inner pore canal of the lattice type bearing frame, and connecting a grouting pump;
and a third step of: starting a grouting pump, taking a lattice type force-bearing frame as a guide frame, starting high-pressure jet grouting guide holes, and simultaneously assisting in pushing the lattice type force-bearing frame into soil by mechanical equipment according to conditions;
fourth step: when the lattice type bearing frame is about to completely enter soil, installing a connecting transition section or a first section of prefabricated standard section, continuously performing rotary spraying jacking, and sequentially and circularly installing a next section of prefabricated standard section until all prefabricated standard sections are placed;
Fifth step: and (3) pulling the shaftless rotary sprayer to retract by using the guide rope, and continuously rotary spraying cement slurry in the lattice type force-bearing frame until reaching the first end of the lattice type force-bearing frame, so as to finish the construction of the coaxial slurry.
7. A method of constructing a coaxial expanded body fabricated support according to any one of claims 1 to 2, wherein the suspended section is used for a vertical column of a foundation pit flat support, the method comprising the steps of:
the first step: manufacturing a prefabricated standard section and transporting to a construction site;
and a second step of: constructing a coaxial expansion section at the position of a supporting upright post to serve as an upright post pile, when the lattice type bearing frame top of the coaxial expansion is positioned at a set position at the upper part of the natural ground elevation, installing a limiting outer cylinder bolt or a limiting inner cylinder bolt at the upper end of the bearing frame, hoisting a first section of prefabricated standard section, sleeving the limiting outer cylinder bolt or sleeving the limiting inner cylinder bolt, determining whether to install a bolt according to the existence of a transverse rib of the limiting cylinder bolt, and repeatedly installing a second section of prefabricated standard section according to the fact;
and a third step of: constructing a first cast-in-place concrete flat support or installing an assembled precast concrete flat support at the tail end of the upper part of the uppermost precast standard section, excavating earthwork to a second flat support position, constructing and installing the second flat support by using a reserved steel member outside the limiting cylinder bolt as a support, and repeatedly installing the flat support;
Fourth step: and excavating the earthwork of the foundation pit to the bottom, pouring a foundation slab, removing the lowest flat support, repeating the steps until the prefabricated standard section of the hanging upright post is removed after the uppermost flat support is removed, and transporting to the next foundation pit engineering for recycling.
8. A coaxial spread body assembled support shaftless rotary sprayer applied to the coaxial spread body assembled support of claim 1, wherein the shaftless rotary sprayer comprises a stator flow transmitter and a rotor sprayer which are communicated into a whole and can rotate relatively, the rotor sprayer is arranged to rotate along a longitudinal axis, and the stator flow transmitter is arranged not to rotate along the longitudinal axis; the stator flow conveyor is hollow and externally connected with a high-pressure flow conveying pipe; the cross section of the rotor ejector is round, and the interior of the rotor ejector is hollow and is provided with a flow conveying pore canal and a fluid jet orifice;
the rotation power of the rotor injector is set as follows: the rotor ejector is internally provided with a spiral flow conveying duct, and fluid drives the rotor ejector to rotate when passing through the spiral flow conveying duct; or,
the rotation power of the rotor injector is set as follows: the rotor ejector is provided with two fluid jet ports, the outflow direction of the jet ports deviates from the radial line direction of the circle center of the circular section to the periphery, the jet lines of the high-pressure jet streams are parallel and symmetrically distributed on the two sides of the circle center of the circular section at set intervals, and the rotor ejector is driven to rotate by virtue of a couple formed by the recoil force of the two high-pressure jet streams; or,
The rotation power of the rotor injector is set as follows: the external of the rotor injector is provided with external backflow driving blades which are symmetrical relative to the longitudinal axis, and the rotor injector is driven to rotate by means of backflow slurry outside the rotor injector body;
the shaftless rotary sprayer is of a shaftless, drill rod-free and rotary spraying pile machine structure, the tail end of the shaftless rotary sprayer is connected with a high-pressure flow transmission hose, rotary spraying power is derived from rotary power brought by the flow direction setting of fluid, and the shaftless rotary sprayer has an automatic forward function and is used for hole guiding or rotary spraying body construction of a straight line path or rotary spraying construction technology of a curve path which cannot be completed by a conventional rotary spraying pile machine.
9. The shaftless rotary sprayers according to claim 8, wherein the shaftless rotary sprayers are used in groups to form a box type combined shaftless rotary sprayer which is used as a soil cement wall forming device, the box type combined shaftless rotary sprayers are suspended and comprise a box type outer cylinder and a group of shaftless rotary sprayers arranged in the box type outer cylinder, the group of shaftless rotary sprayers are arranged on a horizontal sliding rod in the outer cylinder through a rotating shaft, and slide horizontally along the sliding rod and rotate around the rotating shaft by a preset angle;
The horizontal sliding and the rotation are realized by a direction controller connected to the shaftless rotary sprayer, and the direction controller is set as a mechanical traction rope or a fluid control pipe; the box-type outer cylinder is used as a base or a bracket of the shaftless rotary sprayer, provides a space for the shaftless rotary sprayer to move, and ensures and checks the cutting range of the shaftless rotary sprayer;
the traction ropes are symmetrically arranged on two sides of the shaftless rotary sprayer, and the horizontal position and the spraying direction of the shaftless rotary sprayer are adjusted; the fluid control pipes are symmetrically arranged at two sides of the shaftless rotary sprayer, and the horizontal sliding direction and the rotating direction of the shaftless rotary sprayer are controlled by alternately injecting fluid into the shaftless rotary sprayer.
10. A construction method using the shaftless rotary sprayer of claim 8, for constructing a horizontal rotary sprayer disposed deep in a soil body, comprising the steps of:
the first step: manufacturing a vertical hole in a soil body or utilizing the vertical hole left by an engineering pile, arranging a guide device in the hole, and connecting an elastic positioner at the tail end of the shaftless rotary sprayer;
and a second step of: after passing through the guide, the shaftless rotary sprayer and the elastic positioner bend horizontally with the aid of the guide, the high-pressure grouting pump is started, and the shaftless rotary sprayer is started to start rotary spraying;
And a third step of: after the shaftless rotary sprayer reaches a preset position, continuously rotary spraying cement paste while retracting to form a horizontal rotary spraying body;
fourth step: and withdrawing the elastic positioner and the shaftless rotary sprayer, taking out the guide device, completing the construction, and continuing the construction of the next horizontal rotary sprayer.
11. A construction method using the shaftless rotary sprayer of claim 8, for constructing a cement-soil wall of equal thickness, comprising the steps of:
the first step: setting a positioning facility on the ground, arranging a ground positioning rod body with a shaftless rotary sprayer and a lattice type conical end at the lower end of a first section, arranging soil bodies by using a shaftless rotary sprayer guide hole and ensuring verticality, installing a second section of ground positioning rod body, and repeating the steps to finish the construction of the ground positioning rod, wherein the construction efficiency is improved by using mechanical equipment guide holes;
and a second step of: after two preset ground positioning rods are constructed in place, a guide groove is excavated between the two ground positioning rods, a cement soil wall forming device is hung into the guide groove, and U-shaped ends at two ends of the cement soil wall forming device are clamped with the ground positioning rods;
and a third step of: starting a cement soil wall forming device, cutting and stirring soil at the lower part of the cement soil wall forming device to form a sinking space, lifting and continuously spraying cement slurry when the cement soil wall forming device reaches a preset depth, stirring to form a first cement soil groove, and sequentially constructing next cement soil grooves at intervals to finish a first cement soil wall which is arranged at intervals;
Fourth step: and (3) pulling out the ground positioning rod, and constructing a second batch of cement soil walls at intervals sequentially by taking adjacent cement soil grooves which are arranged at intervals of the first batch as positioning and guiding grooves before cement soil slurry of the first batch of cement soil walls is solidified, so that the cement soil walls with the same thickness are formed completely.
12. A method of constructing a foundation pit enclosure wall comprising an enclosure structure and a constant thickness cement-soil wall using the shaftless rotary sprayer of claim 8, said method of constructing comprising the steps of:
the first step: manufacturing an integral enclosure structure comprising a plurality of ground positioning rods, and connecting a box type combined shaftless rotary sprayer at the lower end of the enclosure structure, wherein a flow transmission pipe of the box type combined shaftless rotary sprayer is directly connected with the ground or replaced by the ground positioning rods;
and a second step of: excavating a guide groove at a preset site, arranging an integral enclosing structure, installing a guide positioning frame of the integral enclosing structure, starting a grouting pump to start high-pressure rotary water spraying or cement soil slurry, and sinking the enclosing structure along a space cut by the box type combined shaftless rotary sprayer under the action of the dead weight of the enclosing structure or external auxiliary mechanical equipment;
And a third step of: and the enclosure structure reaches a preset embedding depth, and the construction of the enclosure wall is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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