34results about How to "Avoid settlement deformation" patented technology

The invention discloses an in-situ protection construction method of a pipeline above a foundation pit. The in-situ protection construction method comprises the steps of (1) cracking a pavement; (2) driving two steel uprights corresponding to each of support point parts on the two ends of each truss, and erecting a middle bearing beam arranged horizontally over the two steel uprights; (3) excavating earth; (4) precipitating; (5) erecting a truss over the two opposite middle bearing beams, and arranging upper bearing beams on the top of the truss; (6) wrapping the four sides of a pipeline box culvert with steel plates to form a box culvert strengthening covering barrel, supporting the bottom of the covering barrel by using lower bearing beams, wherein the lower bearing beams correspond to the upper bearing beams one to one; and (7) connecting the lower bearing beams and the upper bearing beams through chain blocks and steel wire ropes. The in-situ protection construction method provided by the invention is capable of avoiding sedimentation deformation of the pipeline box culvert in the construction process of the foundation pit and thus in-situ protection of the pipeline is realized. The in-situ protection construction method is capable of ensuring that the sedimentation deformation value of an important pipeline without moving and modifying conditions within the construction range of the foundation pit does not exceed an allowable value and influence on the support structure and the main body structure of the foundation pit is within a controllable range.

The invention relates to a plain pile reinforcement system used for reserving conditions for long-term lines passing existing lines and a construction method of the system. Under the influence of built metro lines and surroundings, later metro line building conditions are relatively strict, and in a project of passing the existing lines, conventional stratum pre-reinforcement treatment measures cannot meet the safe operation requirements of the existing lines. The system comprises existing tunnels and long-term tunnels above or below the existing tunnels, overlapping regions of planar projections of the existing tunnels and the long-term tunnels are interchanging point ranges, and plain concrete piles are arranged at the interchanging point ranges. Sleeve valve pipe grouting reinforcement areas are arranged between the existing tunnels and the long-term tunnels. By means of the system, physical and mechanical parameter indexes of interlayered soil bodies between the existing lines and the long-term lines can be effectively improved, and the safe operation of the existing lines is ensured. The system has the advantages of being flexible to arrange, adjustable in pile diameter and reliable in stratum treatment effect, and is capable of avoiding the unpredictability of a conventional stratum advance pre-reinforcement effect.

The invention discloses a rainwater collection and permeation system preventing settlement deformation of the ground. The rainwater collection and permeation system comprises a primary rainwater flow abandoning pond, a filtering and purifying pond, a rainwater collection tank and a dry type sludge removing well. Multiple permeation filtering pipelines are vertically connected to the lower portion of the rainwater collection pond at intervals. The rainwater collection pond is formed by building polypropylene plastic modules and is wrapped in a waterproof geomembrane. The permeation filtering pipelines can guide rainwater to cross a foundation bearing layer to reach a lower sand contained layer, it is avoided that damage is generated due to the fact that rainwater permeates into the soil body of the foundation bearing layer for a long time and even soaks the soil body, and therefore a foundation is effectively prevented from settlement deformation. According to the rainwater collection and permeation system preventing the settlement deformation of the ground, the permeation filtering pipelines and the polypropylene plastic modules are combined to form an in-situ permeation system, the demands of ground settlement and utilization of rain seepage are met, the contradiction that the settlement of the ground and the in-situ permeation cannot be unified is overcome, and the rainwater collection and permeation system is widely applied to and built under the ground of rigid pavement park sites, squares, parking lots and the like.

The invention discloses a geocell reinforced cement concrete pavement structure and a surface layer plate thickness calculation method. The pavement structure mainly comprises a base layer, a surfacelayer and a wearing layer which are sequentially laid from bottom to top. The base layer is composed of an upper geotextile layer, a lower geotextile layer and a middle geocell reinforced graded broken stone layer; the surface layer is a cement concrete layer reinforced by a geocell; the wearing layer comprises a cement mixture wearing layer and a geogrid; pull rings are reserved on the two sidesof each geocell in a road direction, the geocells are stretched to be in a tensioned state, and wooden wedges penetrate through the pull rings to fix the geocell at the outermost end. The surface layer plate thickness calculation method mainly comprises the steps of traffic analysis, initial simulation of a pavement structure, determination of pavement material parameters, and checking of load stress, temperature stress and a structure limit state. The problems that an existing pavement structure is low in strength, and a cement concrete pavement is subjected to fatigue fracture, mud pumping,slab staggering and the like under heavy-load traffic are solved, so that the pavement structure has high bearing capacity and deformation resistance, and damage to the pavement structure is reduced.

The invention provides an expansive soil foundation structure containing a ballastless track roadbed and a construction method. The structure comprises porous pipe piles, an expansive soil foundation,a geosynthetics reinforced cushion layer and a ballastless track roadbed, the porous pipe piles and the expansive soil foundation are arranged at the lowermost portion, and the geosynthetics reinforced cushion layer and the ballastless track roadbed are sequentially arranged above the porous pipe piles and the expansive soil foundation from bottom to top; a plurality of porous pipe piles are vertically arranged in the expansive soil foundation, each porous pipe pile comprises a hollow porous pile body and an elastomer material filling the hollow porous pile body, each hollow porous pile bodyis of a hollow reinforced concrete structure, and each porous pipe pile further comprises a radial through hole penetrating through the inner wall and the outer wall of the corresponding hollow porouspile body in the radial direction. According to the method, the expansion and shrinkage deformation of the expansive soil foundation during water immersion and loss is effectively reduced, so that the expansion and shrinkage deformation of the ballastless track roadbed is controlled within a reasonable range, the requirements of high-speed and safe operation of trains on the ballastless track roadbed are met, and the expenses for reinforcing and treating the expansive soil foundation are saved.

The invention relates to the technical field of tunnel construction, and discloses a tunnel construction method adopting a prefabricated inverted arch module. According to the tunnel construction method, a connecting steel frame is supported between a preliminary brace and the prefabricated inverted arch module more firmly, finally, a fastening bolt between the connecting steel frame and an embedding sleeve is fastened again, the connecting steel frame and the embedding sleeve are welded, a fastening bolt between a connecting steel plate and a supporting steel plate is fastened again, the connecting steel plate and the supporting steel plate are welded, accordingly, it is ensured that the prefabricated inverted arch module and the preliminary brace are stably connected, the phenomenon thatdue to the fact that the connecting steel frame is not tightly mounted, and the preliminary brace deforms towards the inner side due to the surrounding rock pressure is avoided; and inverted arch filling in traditional tunnel construction is replaced with the prefabricated inverted arch module, accordingly, it is ensured that a support around the tunnel can rapidly form a closed loop, deformationsettlement of an excavated segment of the tunnel can be avoided, and the stability and the construction proceed of the tunnel structure can be improved.

The invention discloses an urban operation subway heaving control structure and a control method thereof. The urban operation subway heaving control structure comprises a plurality of uplift piles, a bottom-carrying cable pipe and back pressure prestressed tendons, wherein the uplift piles are buried in foundation pits to be excavated on the two opposite sides of an underground structure of an operation subway correspondingly, and the burial depth of the pile tops of the uplift piles is located between the top burial depth and the bottom burial depth of the underground structure; the bottom-carrying cable pipe is supported at the bottom of the underground structure, and the two ends of the bottom-carrying cable pipe are connected to the upper parts of the uplift piles on the two opposite sides of the underground structure correspondingly; the back pressure prestressed tendons abut against the upper part of the underground structure, and the two ends of each back pressure prestressed tendon are connected to the upper parts of the uplift piles on the two opposite sides of the underground structure correspondingly. According to the urban operation subway heaving control structure, the problems that new building products developed on the two sides of an operated metro station easily cause upheaval or settlement of an operated metro structure, and the safety of the operated metro structure is seriously affected are solved.

The invention discloses a vertical radial grouting settlement control method for rigid sleeve valve pipe bundles. The vertical radial grouting settlement control method comprises the following steps that grout overflow holes are marked and drilled in at least three steel pipes with sequentially increased lengths, and a rigid sleeve valve pipe bundle is formed by means of combining and fixing; the positions of a plurality of grouting control settlement holes are calibrated in the arch part of a primary support, and drilling is performed vertically to a set depth; a grouting pipe and an exhaust pipe are bound on the rigid sleeve valve pipe bundle and sent into a grouting control settlement hole, the hole is sealed, and a sleeve shell material is poured; settlement observation points and convergence observation points are installed at set positions, and settlement data of settlement mileage are monitored and controlled in real time; when the settlement data reach a critical settlement value, grouting is conducted according to the length of steel pipes in the rigid sleeve valve pipe bundles from short to long, one rigid sleeve valve pipe is used each time, other rigid sleeve valve pipes are used for standby application, the settlement data are monitored in real time in the grouting process, and grouting is stopped when the monitored settlement data reach the requirement, until controlling of all stratums of the settlement mileage is completed.

The invention discloses a power channel structure crossing a subway route. The power channel structure comprises an originating well, a receiving well and a jacking pipe segment connecting the originating well with the receiving well. The originating well and the receiving well are located on the two sides of an existing subway route, the distance between the originating well and the existing subway route is larger than that between the receiving well and the existing subway route, a pipeline between the receiving well and the originating well comprises an existing highway and original soil onthe two sides of the existing highway, the jacking pipe segment is located between the road surface and the existing subway route, a reinforcing structure is further included, and comprises a first reinforcing structure at least arranged in the original soil between the originating well and the existing highway and a second reinforcing structure located outside a concrete pipe segment, the reinforcing structure is arranged in the original soil, on the premise of ensuring the reinforcing effect, the influence on the operation of the existing highway can be avoided, partition reinforcing in theheight direction is carried out, and the construction time is shortened on the premise of ensuring the reinforcing effect.

A floating raft roadbed structure includes a floating raft tank, The floating raft tank is buried in a foundation pit, A foundation treatment pile is arranged below the foundation pit, the top of thefloating raft box is filled with a roadbed, One side of the floating raft tank is provided with a guide pipe, an inlet pipe and an outlet pipe, one end of the inlet pipe and the outlet pipe is arranged on the sidewall of the floating raft tank, the outlet pipe in the floating tank is connected with a pump arranged in the floating tank, the guide pipe is arranged on the top of the floating raft tank and is communicated with the external atmosphere, and the upper end of the guide pipe is located above the ground. At that same time, when the initial tank is partially fil with water or other liquid, the additional stress of the foundation can be adjusted by increasing or decrease the weight of the liquid, so that the elevation of the roadbed can be restored, and the normal use of the highway and the railway, especially the high-speed railway, can be ensured.

The invention belongs to the technical field of decoration building materials, and particularly relates to a novel detachable light steel keel partition wall structure. The novel detachable light steel keel partition wall structure comprises keels, keel steering connecting pieces and fixing clamping sheets; the keels are used for constructing a partition wall framework, and the four keels form rectangular partition wall modules through the keel steering connecting pieces; and the keels and the keel steering connecting pieces are fixed through first screws after being connected, and the fixingclamping sheets are connected to screws at the corners of the adjacent partition wall modules in a clamped mode and used for fixing the adjacent partition wall modules. Modular and standardized production is achieved, mounting and dismounting are more convenient, and the mounting and dismounting period is remarkably shortened; and compared with a wall body, a better buffering effect is achieved.