141 results about "Soil cement" patented technology

The invention particularly discloses a layered and segmented composite fabricated foundation pit support structure and a construction method. According to the overall technical scheme, double enclosure of deep mixing piles and a cemented soil retaining wall is followed, truss rib laminated slabs are spliced in a layered and segmented mode, an anchor rod group transversely penetrates through the deep mixing piles to be anchored into the cemented soil retaining wall, anchor rod holes are also used as high-pressure grouting holes, anchor rod sleeves guide anchor rods to enter soil and assist the truss rib laminated slabs to be in place, and high-strength grouting materials are grouted at high pressure; according to the design concept of the pile-wall-plate-anchor rod composite type foundation pit support structure, a technical system that a soil layer outside a foundation pit is stabilized through a cement soil retaining wall, force is borne by deep mixing piles, support grouting forming is conducted through a truss rib laminated plate, and overall cooperative bearing is strengthened through anchor rod driving is constructed. And the supporting requirements of complex geological environments and large-depth foundation pits are stably met.

The invention particularly discloses a layered and segmented composite fabricated foundation pit support structure and a construction method. According to the overall technical scheme, double enclosure of deep mixing piles and a cemented soil retaining wall is followed, truss rib laminated slabs are spliced in a layered and segmented mode, an anchor rod group transversely penetrates through the deep mixing piles to be anchored into the cemented soil retaining wall, anchor rod holes are also used as high-pressure grouting holes, anchor rod sleeves guide anchor rods to enter soil and assist the truss rib laminated slabs to be in place, and high-strength grouting materials are grouted at high pressure; according to the design concept of the pile-wall-plate-anchor rod composite type foundation pit support structure, a technical system that a soil layer outside a foundation pit is stabilized through a cement soil retaining wall, force is borne by deep mixing piles, support grouting forming is conducted through a truss rib laminated plate, and overall cooperative bearing is strengthened through anchor rod driving is constructed. And the supporting requirements of complex geological environments and large-depth foundation pits are stably met.

The invention discloses a stiff composite pile construction detection method based on a quantum technology and an electromagnetic geophysical prospecting method, which comprises the following steps of: constructing a peripheral cement soil pile and a core pile, and doping an electromagnetic sensitive material into a cement soil curing agent; a quantum gravity gradiometer and an electromagnetic induction instrument which are integrated on construction equipment are used for collecting gravitational field and electromagnetic field data of a construction area in real time in the whole process of cement soil stirring and core pile pressing-in; the density, the water content distribution and the uniformity of the cement soil are inversed and regulated in real time, and an unfavorable geologic body is identified; dynamically adjusting construction parameters based on cement soil properties and geological conditions obtained by inversion, and performing targeted reinforcement on a bearing stratum; the pile end stress bubble formation and the pile-soil interaction effect are verified; and based on the multi-source data acquired in the whole process, generating a digital quality file of the single pile for quality acceptance. The method can realize a construction process, namely a detection process, a single pile, namely a sensor, and a global data driving decision.

The invention discloses an intelligent cement-soil mixing pile machine, which relates to the technical field of building equipment and comprises a pile machine intelligent edge terminal, an intelligent slurrying station subsystem and a cloud platform management subsystem, the pile machine intelligent edge terminal is integrated on a cement-soil mixing pile machine; the intelligent slurrying station subsystem is located on a construction site; the cloud platform management subsystem is deployed in a remote server; data connection is established between the pile machine intelligent edge terminal and the intelligent pulping station subsystem through a first wireless communication network, and the first wireless communication network is a LoRa long-distance radio micropower wireless network; data connection is established between the pile machine intelligent edge terminal and the cloud platform management subsystem through a second wireless communication network. According to the invention, the crossing from a'fixed formula 'to a'dynamic formula' is realized, the quality uniformity and reliability of the pile body are ensured, the ineffective operation is reduced through optimal control, and the cost of materials such as cement and the like can be obviously saved.

The invention relates to the field of foundation pit supporting design, and provides a method for determining the width of a cement-soil wall composite wall under the water collection and exposed drainage conditions. The method comprises the following steps: acquiring basic physical and mechanical indexes and cement-soil wall parameters of each soil layer in a foundation pit supporting depth range; primarily selecting the built-in depth of the cement-soil wall composite wall body; then calculating active soil pressure of each soil layer on the outer side of the cement-soil wall composite wall and passive soil pressure of each soil layer on the inner side of the cement-soil wall composite wall; calculating an active soil pressure resultant force of each soil layer on the outer side of the cement-soil wall composite wall and a vertical distance from an action point to a wall toe; calculating the passive soil pressure resultant force of each soil layer on the inner side of the cement-soil wall composite wall and the vertical distance from an action point to a wall toe; and finally, calculating and judging the width of the cement-soil wall composite wall body. The method for solving the active soil pressure and the passive soil pressure of the soil layers on the two sides of the cement-soil wall composite wall under the influence of seepage force is provided, the width of the cement-soil wall composite wall can be quantitatively calculated, and the method is more scientific and accurate.

The invention discloses a composite reinforcing method and device for a soft soil levee slope based on prestressed corrugated pile emergency support, and the method comprises the steps: investigating a to-be-reinforced levee slope and engineering geological conditions in an influence range of the to-be-reinforced levee slope, and obtaining investigation data; calculating by setting a slope stability analysis strategy to obtain a natural state safety coefficient; the state of the to-be-reinforced levee slope is judged, and a state result is obtained; according to a state result, a cement-soil mixing pile temporary construction platform, a composite reinforcing area, a prestress wave-shaped pile and a three-dimensional drainage system are designed; and performing construction preparation and reinforcement construction according to the design scheme. The problems of temporary emergency and permanent splitting, construction disturbance instability, high cost, river channel occupation, difficulty in considering efficiency and ecology and the like in the prior art are solved.

The utility model relates to the technical field of groove wall reinforcing construction, in particular to a double-wheel stirring drilling machine which comprises an engineering vehicle and a drilling machine base, a machine frame is arranged on one side of the drilling machine base, a drilling rod is arranged on one side of the machine frame, a lifting machine corresponding to the drilling rod is arranged on the machine frame, a groove milling machine is arranged at the bottom of the drilling rod, and an inclinometer is arranged on the groove milling machine. At least two groups of milling wheels are arranged on the slot milling machine; the bottom of the rack is hinged to the drilling machine base, a connecting frame is arranged on one side of the middle of the rack, a stabilizing rod is arranged between the connecting frame and the drilling machine base, a steel cable is connected to the top end of the drilling rod, and a winch is arranged on one side of the engineering truck. According to the utility model, the milling wheel is used for forming a cement-soil mixing pile with a rectangular groove section in a horizontal axial rotary mixing manner, and a single-shaft or multi-shaft mixing drilling tool is replaced to vertically rotate, so that a cylindrical cement-soil mixing pile is formed, and a wavy surface is prevented from appearing after an underground continuous wall is poured and formed.

The invention relates to the technical field of slope supporting construction of constructional engineering, and particularly discloses a redundant and safe reinforced soil structure and a construction method. Reinforced soil is of a multi-step structure and is constructed on a weathered rock foundation; the reinforced soil sequentially comprises a plain concrete foundation, multiple layers of integral steel-plastic geogrids, a graded broken stone drainage layer, a clay water-resisting layer, a waterproof geomembrane, a concrete sealing bottom and plain filling soil from bottom to top, and reinforced concrete panels are poured on the outer sides of the integral steel-plastic geogrids. A reinforced concrete foundation is arranged at the bottom of the reinforced concrete face plate, a cement soil cushion layer is laid at the bottom of the reinforced concrete face plate, drainage holes and pre-embedded steel tie bars are arranged in the reinforced concrete face plate, the pre-embedded steel tie bars and the whole steel-plastic geogrids are bundled up, and a gravel inverted filter bag is arranged in each layer of steel-plastic geogrids. The clay water-resisting layer and the gravel drainage layer are laid to achieve redundant safe water prevention and drainage, the construction period is controllable, and the manufacturing cost is relatively low.

The application belongs to the technical field of cement soil preparation, and particularly relates to a composite cement soil prepared from seawater, nano-silicon dioxide and polyvinyl alcohol fiber and a preparation method thereof, which comprises 63-70% of dry soil powder, 9-10% of Portland cement, 1.8-2.2% of nano-silicon dioxide, 0.6-1.2% of polyvinyl alcohol fiber, 0.2% of dispersant and 16.4-25.4% of seawater. The composite cement soil can not only significantly reduce the dependence on fresh water resources, but also effectively solve the problems of seawater corrosion and deterioration caused by fatigue cracks due to long-term cyclic loading, thereby significantly improving the mechanical strength of the cement soil foundation and prolonging the service life of the cement soil foundation in the coastal environment, and the composite cement soil also has high economic benefits. The synergistic effect of the nano-silicon dioxide and the polyvinyl alcohol fiber significantly enhances the mechanical properties, crack resistance and seawater corrosion resistance of the cement soil, and effectively inhibits the brittle failure of the cement soil, so that the cement soil can be stably applied in the coastal soft soil foundation reinforcement engineering for a long time.

The invention discloses an inner and outer core variable cross-section composite pile and a construction method thereof.The inner and outer core variable cross-section composite pile comprises an outer core and an inner core, the inner core is a precast concrete pile and comprises a variable cross-section section located on the upper portion and at least one uniform cross-section section located on the lower portion, and the cross-section area of the variable cross-section section is decreased from top to bottom; the variable-section sections and the uniform-section sections are connected through connecting assemblies, every two adjacent uniform-section sections are connected through connecting assemblies, the outer core is a cement-soil mixing pile which is formed in situ on site, part of the section sections of the cement-soil mixing pile are in an expanding mode, and the central axis of the inner core coincides with the central axis of the outer core. The bearing performance, the economical and environment-friendly performance and the construction quality and efficiency of the pile foundation are comprehensively improved.

The present application relates to a kind of soft soil reconsolidation under dynamic load processing method, solve the vibration drainage of existing soft soil in consolidation method vibration frame structure, it is difficult to manufacture vibration support foundation, construction is inconvenient, the problem of destruction of foundation after recovery.The method mixes cement in upper layer soil, forms cement soil base layer with strength in C5-C15;Uniformly set water pipe on cement soil base layer;Vibration rod is set in each water pipe;Place stack load plate on cement soil base layer, and vibration machine is fixed on stack load plate;Vibration machine fixed on stack load plate vibrates, drives vibration rod in water pipe, and free water generated after vibration is collected in water pipe, water in water pipe is discharged using water suction pump, until no free water is discharged after a period of vibration operation.The present application solves the problem that general vibration machine cannot effectively vibrate deep layer soil, and removes free water generated after vibration from soil, simultaneously, promotes soil particle to rearrange, and enhances soil compactness.

The utility model belongs to municipal engineering technical field, concretely relates to a kind of shallow soft soil subgrade treatment combination structure in narrow site, comprising: replacement boundary line, roadbed replacement base layer, replacement demarcation line, ground line, excavation replacement slope line, cement soil mixing pile solid pile, cement soil mixing pile empty pile, cement solidification area and replacement granular material.Excavation replacement slope line starts from replacement demarcation line, and ends in replacement boundary line;Cement soil mixing pile solid pile is located below the area inside replacement boundary line road, its pile bottom is below replacement demarcation line, and pile top is cut off in excavation replacement slope line;Cement soil mixing pile empty pile is only as the "virtual section" that cement soil mixing pile solid pile body extends upwards;Cement solidification area is the area that replacement boundary line, cement soil mixing pile solid pile bottom and excavation replacement slope line, ground line are enclosed to form.The utility model can reduce the range of slope excavation, reduce the influence of excavation replacement subgrade treatment to surrounding environment and building structures.

The utility model relates to the technical field of building construction, in particular to a high-pressure jet grouting pile machine mud prevention device which comprises a mud prevention part, the mud prevention part comprises a mud prevention barrel, a limiting piece and a cover plate, a channel is formed in one side of the mud prevention barrel, the limiting piece is annularly arranged in the mud prevention barrel in a surrounding mode, an opening is formed in the limiting piece, the opening and the channel are aligned, and the cover plate is arranged on the limiting piece. The lower end of the mud-proof barrel is connected with the ground, the cover plate is arranged at the upper end of the mud-proof barrel, a through hole is formed in the cover plate, and a drill spindle of the high-pressure jet grouting pile machine penetrates through the through hole and extends into the mud-proof barrel. According to the high-pressure jet grouting pile machine, the supporting plate abuts against the supporting frame, the supporting plate can reduce vibration of the high-pressure jet grouting pile machine in the working process, the stirring process is more stable, due to the fact that the surface of the limiting piece is obliquely arranged, cement soil can flow into the drainage groove along the shape of the limiting piece when splashed out, cement soil can be prevented from being splashed, and the service life of the cement soil is prolonged. And the cement soil can stably flow in the drainage groove.

The utility model belongs to the technical field of construction equipment, and discloses a cement-soil filler mixing device for foundation construction, which comprises a base, a clamping mechanism arranged on the outer wall of the base, a mixing barrel arranged on the outer wall of the top end of the base, and a stirring mechanism arranged on the outer wall of the top end of the base. The stirring mechanism comprises a fixing rod, a motor is fixedly connected to the outer wall of the top end of the fixing rod, a rotating shaft is fixedly connected to an output shaft of the motor, an inserting block is elastically connected to the inner wall of the rotating shaft through a connecting spring, a rotating disc is fixedly connected to the outer wall of the rotating shaft, and an arc-shaped groove is formed in the outer wall of the rotating disc; the outer wall of the rotating shaft is rotationally connected with a rotating rod; through the arrangement of the stirring mechanism, the stirring rod is used for stirring by pressing the insertion block and rotating the rotating rod, the moving rod and the sleeve rod, and the stirring device can adapt to mixing barrels with different inner diameters, so that the situation that the stirring rod is too short and cannot be used for comprehensively stirring is avoided, and the stirring effect is improved.

The invention provides a method for calculating the safety coefficient of a core pile-cement soil interface of a stiff composite pile. The method comprises the steps that statistical characteristic parameters of interface peak strength and residual strength are obtained according to an indoor shear test; geometric parameters of the pile foundation are obtained, and an interface is dispersed into micro units; a random field is constructed based on the coordinates of the micro-units, and correlation between the micro-units is calculated; setting a target failure probability, a safety coefficient initial interval and calculation precision; performing secondary Monte Carlo sampling to generate an intensity random variable, and assigning each micro-unit after correlation correction; judging the strength state of the micro-unit through a strength triggering threshold value, calculating the overall total resistance of an interface and a design external load, and performing statistics to obtain a failure probability; and adjusting the safety coefficient interval through reverse iteration and linear interpolation based on the target failure probability until the precision requirement is met, and outputting a final safety coefficient. The calculation result is accurate and reliable, and a scientific basis is provided for design and safety evaluation of the stiff composite pile.

The utility model provides a remote monitoring system for guniting construction of a deep stirring and milling cement soil diaphragm wall. The remote monitoring system comprises a slurry supply system and a monitoring system, the slurry supply system comprises double-wheel milling equipment, a first slurry storage barrel and an air compressor, a slurry storage space is formed in the first slurry storage barrel, and a water inlet pipeline, a slurry inlet pipeline and a slurry discharging pipeline which are communicated with the slurry storage space are arranged on the first slurry storage barrel; the slurry discharge pipeline is communicated with the double-wheel milling equipment through a mortar pump and a slurry supply pipeline; the air compressor is communicated with the double-wheel milling equipment through an air supply pipeline; the monitoring system comprises a sensing acquisition module used for detecting gas-liquid parameters of the slurry supply system; the video acquisition module is used for acquiring video data of a construction site; the information sending module is used for sending the gas-liquid parameters and the video information to the cloud server; and the access terminal is used for retrieving the gas-liquid parameters and the video data stored in the cloud server, and is also used for generating a working report according to the gas-liquid parameters. The monitoring system provided by the utility model can remotely monitor and record the construction process.

The utility model provides a cement mixing pile strength detection device which comprises a detection box and a driving box, the detection box and the driving box are communicated through an inlet and an outlet, the front part of the detection box is provided with a sealing box door and a display, the middle part of the bottom in the detection box is provided with a mounting groove, a pressure sensor is arranged in the mounting groove, and the pressure sensor is connected with the detection box. A pressure sensor is arranged in the detection box, a pressure bearing plate is arranged above the pressure sensor, a limiting mechanism is arranged at the top of the pressure bearing plate, a hydraulic cylinder is arranged at the top in the detection box, the bottom of the hydraulic cylinder is connected with a lower pressing plate corresponding to the pressure bearing plate, and a front baffle is arranged at the bottom of one side of an opening in the detection box. And the front baffle plate is vertically and slidably connected to the interior of the detection box. Compared with the prior art, the automatic discharging device has the advantages that due to the design of the limiting mechanism, cement mixing piles of different sizes can be limited to the top of the bearing plate, and automatic discharging work of test piece waste is achieved through the driving mechanism.

This invention discloses a YKP method for constructing cast-in-place piles and the resulting cast-in-place piles, belonging to the field of pile foundation technology. The YKP method for constructing cast-in-place piles involves statically pressing an outer casing into the soil to form a pile hole. An inner sleeve is then used to press extruded concrete from the outer casing into the soil to form a concrete enlargement. Simultaneously, reinforcing members are pressed into the enlargement to form a rigid concrete enlarged head. A reinforcing cage assembly is then placed inside the outer casing, and concrete is poured. After the concrete has initially set, the outer casing is removed, and grouting pipes are used to fill the side gaps with concrete, forming a cement-soil outer ring. This method solves the problems of high noise and severe environmental pollution associated with existing construction methods. There is no collapse, sediment, or necking of the borehole wall, ensuring reliable pile quality. The resulting cast-in-place pile has a cement-soil outer ring on the outside, significantly increasing the frictional resistance between the pile and the surrounding soil. The rigid concrete enlarged head also effectively improves the bearing capacity of the cast-in-place pile.

The invention relates to a pile body stress measuring system and method for an implantable cement mixing pile. The method comprises the following steps of mold assembly, sensing unit assembly, prefabricated cement soil column preparation and maintenance and on-site implantation construction. The device has the beneficial effects that the upper ends of the four claw bodies are hooped by the pair of elastic rubber rings in the annular direction, and axial movement of the inner rod is converted into synchronous radial expansion or contraction of the claw bodies under the constraint of the limiting ring through meshing transmission of conical surface threads and shifting threads; the outer wall of the split type inner wall rough mold is a conical surface, the split type inner wall rough mold is fastened and closed by being matched with a hoop ring for hoop sleeving, the larger the displacement of the hoop ring tightening towards the middle is, the higher the mold closing fastening degree is, and slurry leakage and mold expansion in the filling and pressing process are prevented. Hemispherical protrusions are distributed on the side wall face of the split type inner wall rough mold, so that the prefabricated cement soil column and the micro-expansive cement are attached more tightly, meanwhile, the end of the supporting slender rod abuts against the inner walls of the semispherical protrusions in a matched mode, and fixing of the soil pressure cell during pouring is achieved.

In a soil-cement wall containing a core material, the required strength level for the soil-cement is reduced by continuously arranging the core material in the direction of the wall's extension, thereby ensuring the wall's performance while suppressing carbon dioxide emissions by using a solidifying agent with a high blast furnace slag content. [Solution] A soil cement wall is constructed of soil cement, which is a mixture of soil and a solidifying agent containing cement and blast furnace slag, and a steel core material is cast into the soil cement, which is continuously arranged in the direction of extension of the wall, wherein the solidifying agent has a blast furnace slag content of 60% by mass or more overall, does not contain a cement hardening retarder, or has a cement hardening retarder content of 2% by mass or less, and the uniaxial compressive strength of the soil cement is 2.0 N / mm 2 The following soil-cement wall is provided.

The invention relates to the technical field of building foundation construction, in particular to a preparation method of a cement-soil composite pile body based on ectopic stirring, which comprises the following steps: S1, mixing cement, water, a water reducing agent and a retarder to prepare slurry; and S2, positioning and punching are conducted on the construction site. And S3, underground soil is drilled through a drilling machine, and the underground soil is fished to the ground. And S4, stirring and mixing the slurry and underground soil on the ground to obtain a mixed solution. And S5, the mixed liquid is conveyed back into the piling hole. And S6, the precast pile is inserted into the pasty mixed liquid in the piling hole to form a composite pile body. Cement slurry is prepared into slurry with a gelling agent function, and a process method of a cement mixing pile is completely changed, namely underground soil is firstly taken out to the ground and then is mixed and stirred with the slurry from the ground to complete ectopic stirring, so that close combination of a cement soil material and a precast pile on a microstructure level is realized, and the construction efficiency is improved. And the integrity, the bearing capacity and the durability of the composite pile are obviously improved.

The invention relates to a CO2 anti-escape construction method for a water-based foam carbon sequestration cement soil mixing pile, which comprises the following steps of: connecting a CO2 foaming machine to a slurry conveying pipe of a mixing pile machine through a three-way pipe, after a drill rod of the pile machine cuts a soil body to a preset soil layer depth, injecting slurry into the drill rod through the slurry conveying pipe, and simultaneously injecting CO2 water-based foam into the slurry conveying pipe through the CO2 foaming machine to be mixed with cement slurry, the drill rod is lifted while guniting towards the surrounding soil body to form a water-based foam cement soil pile; and when the water-based foam cement soil pile is constructed to a certain height away from the ground surface, the water-based foam filling valve is closed, the drill rod continues to be lifted, a section of high-mixing-amount cement soil pile is formed on the top of the water-based foam cement soil pile, and finally a lime soil mattress layer with a certain thickness is constructed on the top of the cement soil pile. The carbon sequestration effect of the cement soil pile can be improved, and CO2 in cement soil is prevented from escaping from the earth surface.

The application discloses a model pile production, testing and monitoring method for a seismic liquefaction model test, which comprises material selection for simulating concrete, material selection for simulating steel and mold design; the material selection for simulating concrete is to select cement soil, the material selection for simulating steel is to select nylon wire, and the adhesion between the nylon wire and the cement soil adopts viscous adhesive. The application completely provides a complete scheme of the model pile for the seismic liquefaction model test; according to the device and the method, the technical requirement is low; the obtained model pile can be used for the seismic shaking table test of the model pile against liquefaction, and basically meets the requirements of the scale model on the concrete strength, the elastic modulus, the model pile bending strength and the like.

This invention relates to the field of foundation pit support technology, specifically to a device for removing the inclined brace and core of a synchronous concentric cement-soil composite inclined brace pile. The device includes a rigid pipe body and a tubular liner coaxially arranged on the inner wall of the rigid pipe body. The tubular liner extends along the length of the rigid pipe body and is filled with cement-based material to form the core. In operation, the rigid pipe body is inserted obliquely into the foundation pit, and cement-based material is poured into the tubular liner to form the inclined brace. The top of the inclined brace abuts against the inclined surface of the cap beam. This invention, by setting a heat-melting tubular liner inside the rigid pipe body, allows the rigid pipe body to be removed from the foundation pit after a stable inclined brace structure is formed by injecting cement-based material into the liner. Heating the rigid pipe body melts the tubular liner and lubricates the solidified cement-based material, enabling separation of the cement-based material from the rigid pipe body. This facilitates repeated recycling of the steel pipe, thereby saving construction costs.

The utility model relates to the technical field of SMW construction method pile profile steel positioning, in particular to an SMW construction method pile profile steel positioning fixture which comprises a foundation and profile steel, a cement soil mixing pile is arranged on the foundation, the profile steel is embedded into the upper portion of the cement soil mixing pile, a positioning device is arranged on the upper side of the profile steel, and the positioning device comprises a steel bar rod and a positioning steel plate. A laser positioner is arranged on the foundation; the laser positioner comprises a shell, a sliding rail and a laser spotlight, an inserting rod is arranged at the bottom of the shell, a lamp holder is arranged on the sliding rail, the laser spotlight is connected with the lamp holder, and a locker is arranged on one side of the lamp holder; a cursor is projected through the laser positioner, the profile steel can be conveniently positioned when being inserted into the cement soil mixing pile, meanwhile, the top of the profile steel is corrected through the positioning device, it is ensured that multiple sets of profile steel are parallel, uniform in interval and capable of being accurately inserted into the cement soil mixing pile at standard intervals, and attractiveness is improved.

The utility model discloses a reinforced shield machine cutterhead of tunnelling contour line peripheral stratum, this shield machine cutterhead includes cutterhead, high pressure nozzle, grouting pipe and grouting pump, and the cutterhead includes ring beam, amplitude arm and flange plate, and the amplitude arm is fixed evenly on the flange plate with interval, and the middle part and the end of amplitude arm are connected through ring beam, and the cutter is installed on the cutterhead, and the outer edge surface of the outermost ring beam is provided with mounting hole, and the high pressure nozzle is installed in the mounting hole, and the grouting pump is installed on the shield machine trolley. The utility model improves the structure on the cutterhead, and the mounting hole is arranged on it, and the high pressure nozzle is installed in the mounting hole, and the high pressure cement slurry is injected into the nozzle through the grouting pump through the grouting pipe, and the high pressure cement slurry that sprays cuts and stirs the stratum outside tunnelling contour and mixes with the soil, forms the mixture of cement and soil, and the mixture forms the cement soil with certain intensity after several days, plays the supporting and water -resisting effect when excavating the butt joint section, prevents stratum collapse and muddy water from gushing into the tunnel.

The utility model relates to a device for controlling the thickness of virtual laying of cement soil, which belongs to the technical field of road laying and comprises a base, a vertical rod, a graduated scale, an indicating rod and a clamping mechanism. The vertical rod is vertically fixed on the base, a mounting groove is formed in the vertical rod in the vertical direction, and a graduated scale is arranged in the mounting groove; the indicating rod is provided with a limiting hole matched with the vertical rod, the indicating rod is provided with a contraction joint which enables the limiting hole to be communicated with the outside, and the side wall of the contraction joint is provided with a locking hole. The clamping mechanism comprises a locking rod, a cam and a deflector rod, the locking rod is slidably sleeved with the locking hole, one end of the locking rod is fixedly connected with a first limiting block, the other end of the locking rod is hinged to the cam, and the deflector rod is fixedly connected to the cam. The utility model effectively solves the problems that the existing device for controlling the false laying thickness of the cement soil rubs the scales on the scale rod when the indicating rod is adjusted in a sliding manner, so that the scales are lost and become fuzzy, the position adjustment of the indicating rod generates an error, and the construction quality is influenced.

The invention discloses synchronous pile forming construction equipment and method for H-shaped concrete filled steel tube mixing composite piles, and belongs to the technical field of geotechnical engineering and foundation construction.The synchronous pile forming construction equipment comprises a power head connecting system and a hollow main shaft and is used for providing rotating torque and vertical pressure needed by construction; the upper end of the hollow main shaft is coaxially and fixedly connected with the power head connecting system, and a channel for conveying cement paste or concrete is formed in the hollow main shaft; according to the synchronous pile-forming construction equipment and method for the H-shaped concrete-filled steel tube mixing composite pile, the H-shaped steel has excellent section inertia moment and flexural rigidity and can give full play to the bending resistance advantage of high-strength steel as a core framework layer, and internal micro-expansive concrete and the H-shaped steel are tightly combined, so that an interface gap is eliminated, and a vertical load and a bending moment are cooperatively borne; the external cement soil pile body provides reliable lateral constraint, the three-layer structure is stressed cooperatively, and the overall bearing capacity of the pile body is greatly improved.

The utility model provides easy-to-lay anti-skid cement geotextile, which comprises cement geotextile and further comprises a geotextile base layer, a hydrophobic layer, an anti-scratch layer, a reinforcing layer, a heat insulation layer and a sun-proof layer, and the reinforcing layer is fixedly arranged on the side wall of the top of the geotextile base layer. The aramid fiber filaments are arranged below the hydrophobic layer in a net shape, the cement geotextile can be well prevented from being scratched by sharp objects when the cement geotextile is laid, and therefore the laying difficulty is reduced, the cement geotextile can be well fixed by inserting the fixing cones into soil and inserting the anti-skid blocks into the top of the soil layer, and the cement geotextile is prevented from being scratched by the sharp objects when the cement geotextile is laid. According to the cement geotechnical cloth laying device, the cement geotechnical cloth is prevented from sliding, the laid cement geotechnical cloth is prevented from deviating, the fixing cones are fixed in the inserting grooves through glue hardening, the adjacent cement geotechnical cloth can be conveniently and well connected, and the cement geotechnical cloth is firmly connected.

The invention relates to a drill bit device of a three-dimensional mutual-shearing cement-soil mixing pile and a construction method, the drill bit device of the three-dimensional mutual-shearing cement-soil mixing pile comprises a bottom drill bit, a driving rod is coaxially fixed to the upper end of the bottom drill bit, and drilling and digging wing plates are fixed to the two symmetrical sides of the driving rod in any radial direction correspondingly; a slurry outlet hole used for outputting cement slurry is formed in the upper side of the drilling and digging wing plate, a slurry inlet pipe used for injecting the cement slurry is arranged in the driving rod and communicates with the slurry outlet hole, a sleeve is coaxially fixed to the outer side of the driving rod, a rotating shaft is arranged on the sleeve, and the axis of the rotating shaft is collinear with the radial direction of the sleeve. A transmission assembly is arranged on the driving rod to drive the rotating shaft to rotate in the axis direction of the rotating shaft, stirring blades are arranged on the rotating shaft, the multiple stirring blades are evenly arranged in the axis direction of the rotating shaft at intervals, and the construction method of the drill bit device of the three-dimensional mutual shearing cement soil stirring pile is further included. The stirring device has the effects of reducing the stirring frequency and improving the working efficiency.