37results about How to "Reduce Temporary Support" patented technology

The invention relates to an excavation construction method of an ultra-shallow buried uneven weathered stratum of a tunnel. A segmented step method is used for construction, and a tunnel section is divided into a left side of an upper station, a right side of the upper station, a middle station and a lower station; each segment of step is sequentially constructed circularly, one-time excavation length of each segment of step is not larger than 30m preferably, and a middle partition wall is changed into a straight wall from the traditional curved wall at the left side of the upper station. Thus, for the uneven weathered stratum in the shallow buried area of wall rocks, the dynamic construction method using the segmented step method has little process interference, reduces the construction cost, has simple operation, safety, reliability, less temporary support, low fund investment and high construction speed, is suitable for large machinery for construction, and ensures that the whole construction process is in a safe, stable, high-quality and high-speed controllable state.

The invention relates to a method for partitioning and assembling a 'droplet-shaped' radial single-layer steel pipe grid shell. The method comprises: a southern side grid shell consists of radial steel pipes and a plurality of annular contour steel pipes; the local is provided with a large-area sightseeing window, and a smooth grid shell curved surface is formed; and a northern side grid shell consist of vertical and horizontal steel pipe meshes, and a cambered surface with larger curvature is formed. The method is characterized in that the grid shell is divided into top ring girders, and lower parts of the top ring girders are subjected to grid partitioning along various radial axial lines; projections of the radial axial lines are all radial straight line segments; and after the lower parts of the top ring girders are partitioned according to the radial axial lines, the horizontal position between various blocks can be positioned through main axis pipes on both sides of each block, and the blocks are subjected to filling connection by spare parts. The method has the advantages of effectively solving the problems of lifting and positioning of the 'droplet-shaped' radial single-layer steel pipe grid shell and accumulative errors between grid shells during grid shell assembly, reducing the upper-air welding workload, creating conditions for shortening the duration of a project, saving temporary supporting during grid shell construction, and creating certain economic benefit.

The invention relates to a construction technology of a step temporary support and partial double side walls. The construction technology is characterized in that an upper half cross section is excavated by a step method; a center reinforced concrete column wall temporary support system is constructed; and a lower half cross section adopts the double side walls. For the center reinforced concrete column wall temporary support system, a plurality of rows of vertical steel supports are arranged vertically; the distances between the vertical steel supports are 1.0m; the vertical steel supports are internally provided with cross connections, longitudinal connections and bridgings; feet-lock bolts are constructed at vaults on the two sides of the vertical steel supports; mortar bolts are constructed at arch springs on the two sides of the vertical steel supports; the vertical steel supports, the cross connections, the longitudinal connections, the bridgings, the feet-lock bolts and the mortar bolts form a reinforcement framework; the reinforcement framework is poured with concrete to form a concrete solid column in size of 2.0*2.0m-4.0*4.0m; the interval between every two concrete solid columns in a whole tunnel is 4-8m; and a steel arch injection concrete enclosed wall body is arranged between every two concrete solid columns. With the adoption of the technology, on the premise that construction safety is ensured, the construction period of a project is shortened by 15% entirely, and construction cost is saved by 6% approximately.

The invention belongs to the field of assembled building construction, and particularly relates to an assembled shear wall post-pouring ring beam template and plate support integrated design and construction method. The assembled shear wall post-pouring ring beam template and plate support integrated design and construction method comprises the first step of template system calculation model determining, the second step of template system bearing capacity checking calculation, the third step of prefabricated plate support system calculation model determining, the fourth step of prefabricated plate support system bearing capacity checking calculation, the fifth step of template system component material determining, the sixth step of back ridge manufacturing, the seventh step of template manufacturing, the eighth step of right-angle bolt manufacturing, the ninth step of template inner support manufacturing, the tenth step of template installing, the eleventh step of prefabricated platehoisting and the twelfth step of concrete pouring. The assembled shear wall post-pouring ring beam template and plate support integrated design and construction method solves the key technical problems about difficult post-pouring ring beam template fixing, plate bottom slurry leakage, displacement and the like, template and prefabricated plate support integration is achieved, prefabricated platebraces are saved, post-pouring ring beams meet the bare concrete requirement, the template standardization degree is high, factory production and assembled installation are achieved, cyclic usage is repeated, and the national environment protection and energy saving requirements are met.

The invention relates to a tunnel excavation method in the shallow-buried bias-pressure toppling-deformation bulk solid and strong-unloading rock structure, in particular to the tunnel excavation method in shallow-buried bias-pressure toppling-deformation bulk solid and strong-unloading rock structure in the field of tunnel construction and aims to reduce temporary support workload and prevent landslide triggered by tunnel excavation and oversize deformation of tunnels. The method includes steps of a, dividing a tunnel to be excavated into an upper step, a middle step, a lower step and an inverted arch; b, excavating the upper step and supporting; c, excavating the middle step and supporting; d, excavating the lower step and supporting; e, excavating the inverted arch and supporting. According to self-stabilization of the surrounding rock the corresponding tunnel excavation way is determined, slope excavation is realized by sufficiently utilizing self-stabilization of the surrounding rock and temporary support is reduced. By the tunnel excavation method, construction is speeded up, investment is reduced and construction safety is ensured.

The invention provides a super-large-section subsurface tunnel tall core soil dismounting method. The method includes the following steps that (1) a first pilot pit is formed through excavation on theupper portion of one side of upper core soil in the longitudinal direction of a tunnel, and the first pilot pit is in a horizontal state; (2) a second pilot pit in a horizontal state is formed through excavation on the upper portion of the other side of the upper core soil in the longitudinal direction of the tunnel, the first pilot pit and the second pilot pit are pushed in the excavation direction, and then the upper core soil is excavated so that a transverse channel which is perpendicular to the first pilot pit and the second pilot pit can be formed; (3) a first step group which comprisesa plurality of steps is formed by excavating the first pilot pit, and the length of each step of the first step group is 3-5 m; (4) the upper core soil is dismounted transversely, and thus a step full-section with the length being 6 m is formed; (5) downward excavation is performed below the second pilot pit, and thus a second step group which comprises a plurality of steps is formed; (6) excavation of a core soil inverted arch and construction of an inverted arch second lining are performed; and (7) tunnel large-section second lining construction is performed.

The invention discloses a construction method of a multi-arch tunnel without a middle wall. The construction method comprises the steps of digging a right-side tunnel, performing primary supporting and secondary lining, constructing the external surface of a right-side tunnel early-period support to a step-shaped contact surface which is also a rough surface, pouring a reinforcing bar in each step, wherein one part of the reinforcing bar is poured in the early-period support and the other part is exposed to outside; digging a left-side tunnel, performing left-side tunnel early-period supporting and secondary lining; constructing the surface of the left-side tunnel early-period support to a step-shaped contact surface which matches the external surface of the right-side tunnel early-period support, thereby matching the step-shaped contact surface of the right-side tunnel, and fully pouring the reinforcing bars which is exposed to outside in a previous step into the left-side tunnel early-period support in injection; and forming an integral force bearing system. The construction method of the multi-arch tunnel without the middle wall has advantages of simple construction process, high speed and stable connection structure.

The invention discloses a construction method for a super-large section and a transition section of a road tunnel bifurcation, and belongs to the technical field of tunnel engineering. The construction method comprises the steps that 1) excavation is conducted from the end of a bifurcation way on the right side of a tunnel to the transition section, and an upper right pilot tunnel is excavated in a large section; 2) temporary support is conducted on the upper right pilot tunnel excavated in the step 1); 3) the transition section of the tunnel is excavated forwards horizontally from an upper step of the upper right pilot tunnel of the large section, and an upper step of a pilot tunnel on the right side of the transition section is formed after a certain distance is excavated; and 4) primary support is conducted on the upper right pilot tunnel excavated in the step 3), and meanwhile locking opening reinforcing and the like are conducted. According to the construction method for the super-large section and the transition section of the road tunnel bifurcation, the pilot tunnel is adopted to penetrate through the super-large section in advance, and support of the head section and the tail section of the super-large section is strengthened; through the special excavation method and the support mode, the safety of the excavation process can be ensured, and the situations of excessive vault settlement, arch wall convergence, unstable arch springing, serious heaving floor and the like caused by the fact that the section is too large can be avoided; and compared with an existing excavation method, the construction method has the advantages that the number of temporary supports is small, and support dismounting is easier.

The invention relates to a building structure assembled by concrete dense rib plate box body units. Concrete dense rib plates are adopted for prefabricating box body units, the box body units are connected and fixed with each other through screw bolts to form the building structure, the concrete dense rid plates are used as load bearing walls and floor slabs of the box body units, and the concrete dense rib plates are connected and fixed through screw bolts. The box body units of the invention can realize standardized and industrialized production, have reliable quality, save the building time and the building cost, and have the advantages of precision, high speed, economy and no pollution.

The invention relates to the field of tunnel construction, in particular to a large-section tunnel excavation method based on a double-side-wall pilot tunnel method. The large-section tunnel excavation method comprises the steps that step 1, construction preparation is conducted and is characterized by further comprising the following steps that step 2, an upper step of a pilot tunnel is constructed; step 3, an upper step of the following pilot tunnel is constructed; step 4, an upper step of the middle pilot tunnel is constructed; step 5, a lower step of the pilot tunnel is constructed; step 6, a lower step of the following pilot tunnel is constructed; step 7, a lower step of the middle pilot tunnel is constructed; step 8, monitoring and measuring are performed; step 9, dismantling is performed; step 10, sealing is performed; step 11, inverted arch construction is conducted; and step 12, arch bridge construction is conducted. The large-section tunnel excavation method is convenient to construct and high in efficiency.

The invention discloses an assembled multi-groove reinforced composite floor slab. The assembled multi-groove reinforced composite floor slab comprises a mould board and a cast-in-place concrete layer poured on the mould board, wherein the mould board comprises a bottom board and reinforcing ribs, the reinforcing ribs and the bottom board are of an integrated structure, the reinforcing ribs are upwards perpendicular to the bottom board, functional intervals and/or structural intervals are formed between the reinforcing ribs, the upper ends of the functional intervals are sealed with cover plates to form cavities or are filled with functional materials, stressed steel bars are uniformly distributed in the bottom plate, the stressed steel bars extend out of the bottom board, the cast-in-place concrete layer comprises a steel bar net formed by laying horizontal steel bars and vertical steel bars and concrete, and the steel bar net is fixedly connected with the reinforcing ribs. By adopting the floor slab structure comprising the template comprising the bottom board and the reinforcing ribs and the cast-in-place concrete layer poured on the mould board, the overall strength and bearing capacity of the composite floor slab can be enhanced, the overall rigidity of a traditional small-span composite floor slab can be improved, the slab bottom cracking and overall deformation in the production process are prevented, and the requirements of a larger-span assembled floor slab are met.

According to the integral supporting structure of the multi-arch tunnel and the rapid construction method of the integral supporting structure, a main hole is directly excavated in a segmented mode, combined supporting is arranged, the disturbance frequency is reduced, and the stability of the tunnel and surrounding rock is improved. Primary supports and waterproof structures can be independently constructed, adjacent cavern primary supports are supported in a connected mode, the deformation control effect is good, and the waterproof effect is good. Compared with a conventional construction method, the technology is less in temporary support and simple in process; the support construction is simple, and the quality is good; excavation and support construction of the left and right caverns can be separated in a left and right cavern staggered distance mode and a middle partition wall, cross operation can be effectively avoided, and the engineering quality is guaranteed. According to the technology, the problems existing in a traditional construction method can be effectively solved, the construction requirements of double-multiple-arch tunnels or even multiple-multiple-arch tunnels in China are met, and the application prospect is wide.

The invention relates to a multi-plate unit structure of a steel box girder and a combined manufacturing method, which can effectively shorten the total splicing manufacturing period, reduce the construction difficulty and save the production cost, and comprises the steel box girder, four top plate units positioned on the steel box girder, and two sides of the four top plate units are respectively welded with two top plate units, the bottom plate three-splicing unit is located at the bottom of the steel box girder, the two sides of the bottom plate three-splicing unit abut against the inclined plate two-splicing units, the inclined surface of the steel box girder on the two sides of the bottom plate three-splicing unit is provided with the inclined bottom plate two-splicing units, and the cladding plate unit is arranged between the inclined bottom plate two-splicing units and the top plate four-splicing unit. The method has the advantages that the problem that the period is long when the steel box girder is generally spliced is effectively solved, and the production efficiency is improved; 2, the difficulty of the construction height of the steel box girder during total splicing is avoided, the construction difficulty is reduced, and the overall manufacturing precision and the appearance of a welding seam are ensured; and thirdly, during total splicing, a plurality of plate unit assemblies are integrally hoisted at one time, so that temporary supports in the box can be effectively reduced, the number of tools is greatly reduced, and the production cost and the workload are saved.

The invention relates to the technical field of tunnel construction, and discloses a blasting process of a hard rock multi-arch tunnel. According to the blasting process of the hard rock multi-arch tunnel from the optimization angle of the tunneling area and sequence of a tunnel face, the structure of surrounding rock is fully used, a support middle pilot tunnel does not need to be excavated, variable actual working conditions can be met, the precision requirement is low, and the operability is high. The blasting process can be widely applied to the construction process of the hard rock multi-arch tunnel, a working face and temporary supports are reduced, the tunnel is flexibly and conveniently excavated and supported, additional materials are not needed, the construction cost is reduced, integral blasting excavation can be performed after a stepped section is formed, the engineering progress is accelerated, and a great popularization value and wide application prospects are achieved.

The invention provides a suspended formwork structure of a steel structure composite floor slab, and belongs to the technical field of building construction. The suspended formwork structure comprises a steel structure beam; the inner sides of a pair of I-shaped beams of the steel structure beam along the length direction are respectively provided with a row of first mounting holes at intervals; each first mounting hole is internally provided with a hanging part; the two rows of first mounting holes in the inner sides of the pair of I-shaped beams are in one-to-one correspondence; steel pipes are erected on the two hanging parts in one-to-one correspondence in the width direction of the steel structure beam; first square battens are arranged between the upper portions of the two ends of each steel pipe and the corresponding I-shaped beam in a clamped mode; second square battens are arranged on all the steel pipes in the length direction of the steel structure beam at intervals; a formwork is placed on the upper portion of the second square battens; and the upper surface of the formwork is flush with the upper surface of the steel structure beam. According to the suspended formwork structure of the steel structure composite floor slab, the structure is simple and reliable, the construction efficiency is high, the lower construction operation space is saved, interpenetration operation is facilitated, the construction period is shortened, most parts can be reused, and the cost is saved.