163results about How to "Large construction space" patented technology

The invention relates to the technical field of railway tunnel construction, specifically a digging method of IV and V-class surrounding rock railway tunnel with large cross section, aiming to solve the problems of the existing railway tunnel digging method including narrow operation space, low work efficiency, inflexible construction method, instable construction progress, high deformation potential of surrounding rock, and inconvenient operation. The method comprises performing leading support, digging arc-shaped pilot tunnel and preserving core soil; staggeredly digging left/right side walls of middle sidestep and preserving core soil; staggeredly digging left/right side walls of lower sidestep and preserving core soil; sequentially digging upper, middle and lower sidesteps and preserving core soil; and digging inverted arch and carrying out preliminary support. The invention has large construction space and high work efficiency, and can perform multi-job parallel operation. When the geologic conditions are changed, the invention can be flexibly and timely converted to other construction method. Preservation of core soil and left/right staggeredly digging are helpful to the stability of the digging working face. When the surrounding rock has large deformation, the invention can adjust closure time as soon as possible under the prerequisite of assuring safety and meeting requirements of clearance cross section.

The invention provides a construction method for a soft rock deformation tunnel lining support dismantling-replacing arch. One-time whole section integral dismantling and replacing of a lining support is achieved. The construction method has the advantages that before dismantling and replacing, a lining which loses bearing capacity is subjected to grouting reinforcement treatment first, then a temporary cover arch is additionally arranged outside for reinforcement, and afterwards, the lining support is dismantled step by step, so that potential safety hazards caused by dismantling or removing of a temporary platform frame are avoided, and some security risks are avoided effectively. According to the construction method, the construction difficult problem of soft rock large deformation occurs during construction of a tunnel in special and complex geology is solved. Through the created novel construction method, the construction difficult problem of second lining cracking deformation needing remediation due to weak surrounding rock large deformation is solved. Through the construction method, safe, fast and economic treatment and remediation of the lining support and arch replacing construction are achieved, and the tunnel structure stability and construction safety are ensured effectively.

The invention discloses a large cross-section weak surrounding rock tunnel three-step and six-part short-distance construction method, which comprises the steps as follows: (1) annularly excavating an upper step of an upper part arc pilot tunnel, transferring excavated earthwork of the upper step to a lower step; (2) excavating a left part of a middle step about 4.5-5 meters behind the upper step, and transferring excavated earthwork to the lower step; (3) excavating a right part of the middle step about 3-4 meters behind the left part of the middle step, and transferring excavated earthwork to the lower step;(4) excavating a left part of the lower step about 6-8 meters behind the left part of the middle step or about 3-4 meters behind the right part of the middle step, and conveying excavated earthwork of the left part of the lower step out of the tunnel; (5) excavating a right part of the lower step about 3-4 meters behind the left part of the lower step, and conveying excavated earthwork of the lower step out of the tunnel; and (6) excavating the rest part of the tunnel bottom about 20-25 meters behind the right part of the lower step, excavating continuously according to the steps in a circulating and interlacing manner, and finally realizing tunnel excavating construction. The method can be used for building a large cross-section tunnel in a safe, rapid and economic manner.

The invention relates to passenger dedicated railway line bridge construction field, in particular relates to a method for constructing a cast-in-site continuous girder on a passenger dedicated railway line, which is provided with brackets, solving the problems of narrow operation room, large equipment investment, large material consumption and trivial operation processes in bridge construction of a passenger dedicated railway line in the prior art. The method includes the following steps: groundsill treatment, frame linking, formwork fabrication, support preliminary compression, steel bar prefabrication, steel conduit and corrugated pipes installation, pedestal construction, concrete casting, and prestress construction. The pedestal construction includes temporary pedestal construction and permanent pedestal construction; the prestress construction includes tensioning and anchor seal. The prestressing tendon of the girder is pulled in the direction order of vertical, transverse and then vertical, and unshrinkable cement mortar is used during anchor seal. The construction space is big and a plurality of work surfaces can work in parallel or crosswise. The invention has the advantages of simple construction and wide applicability and is easy to operate. The invention is suitable for girders with different spans and structures and is simple in operation, small in material consumption, large in turnover frequency and low in work intensity and can save cost and is safe and reliable and easy to popularize.

The invention discloses anexcavation and supporting structure for a weak surrounding rock super-large cross-section tunnel and an operation method thereof. The weak surrounding rock super-large cross-section tunnel adopts six-step excavation and supporting for two side walls of an upper bench, and seven-step excavation and supporting based on a benching tunneling method are adopted for a lower bench. Before the excavation, an advanced small pipe is firstly adopted to perform an arch-part advanced support, and then a tunnel section is constructed in thirteen steps in a certain order. The excavation structure and method disclosed by the invention can ensure a large construction space for excavation, large-scale construction machinery can be introduced in each step, a plurality of construction sites can be constructed at the same time, so that high working efficiency is realized and construction progress is accelerated to a large extent, the number of temporary supports applied in a super-large cross-section construction process is reduced, the construction process is accelerated, temporary support removing process is simplified, safety is ensured, and efficiency is increased.

The invention discloses a method for excavating mountain tunnels in weak surrounding rock-fractured zones or shallow covered slope sections, which includes the following steps: (1) cover arch and forepoling; (2) tunnel cutting, including the following steps: (a) the annular part of the upper cross section of the portal of the buried tunnel is first cut, a core soil part is formed on the upper cross section, and an arch is formed; (b) combined bolting and shotcrete is carried out on the arch; (c) the core soil part is cut; (d) the lower cross section of the portal of the buried tunnel is cut; (e) first shotcrete and combined bolting and shotcrete are carried out on the left and the right sidewalls; (f) an inverted arch is lined and backfilled; (g) secondary lining is carried out; (3) step 2 is repeated until the leading pipe shed construction of the next tunnel section is carried out; (4) step 3 is repeated until the tunnel runs through the weak surrounding rock-fractured zone of a mountain. The construction space is large, multi-working face parallel operation can be carried out, and the working efficiency is high; and since the core soil is reserved on the upper cross section and the left and the right cross sections on the lower cross section are staggerly cut forward, the cut working face can be kept stable.

The invention relates to a support structure for preventing settlement deformation of tunnels and a construction method thereof. Long pipe shed method and center cross diagram method generally use constant section tunnel construction during excavation; owing to a triangular area soil body between pipe sheds and a primary support, the primary support fail to be attached to the long pipe sheds tightly, which is unfavorable for the stress of the long pipe sheds and primary support combination. The support structure comprises an annular permanent steel arch in a tunnel; the annular permanent steel arch is composed of a plurality of parallel multi-ring variable section units in the longitudinal direction of the tunnel, the longitudinal section being zigzag in shape; a temporary steel arch is arranged between sectional pilot tunnels; long pipe sheds are uniformly distributed on the top of the arch portion of the permanent steel arch; small grouting guide pipes are uniformly arranged on the outside of the two side walls of the permanent steel arch. A variable section mode is adopted in the longitudinal direction of tunnels, and the primary support can be tightly attached to the long pipe sheds; the primary support and the long pipe sheds are combined for support, thereby being capable of controlling settlement. The structure process is simple; the operation space is large; the support structure is in favor of mechanical construction and prevents the increase of construction cost.

The invention relates to a three-arched tunnel construction method. The three-arched tunnel construction method comprises the following steps that a left opening is first excavated, the complete crosssection of the left opening is preliminarily supported and close to form a ring, then a right opening is excavated, and the staggering distance of excavation of the left opening and the right openingis greater 15 meters; after secondary lining and a middle partition wall of the left opening and the right opening are completed, a middle opening is excavated; when the middle opening is excavated,an upper half cross section is firstly excavated, then arch lining is executed, the lower portion is excavated after the arch lining is completed, and finally an inverted arch of the middle opening isconstructed. The three-arched tunnel construction method has the advantages of few working processes, few surrounding rock disturbance times, good safety, high working efficiency, high construction progress and the like.

The invention relates to the technical field of hoisting devices and particularly relates to a stepping type hoisting platform. The stepping type hoisting platform comprises a working table board, positioning locks, a moving bracket, a pedal, a pedal bracket, a steel cable, a supporting framework, a steel cable connector, crosspieces, a pulley, a resetting spring and a table board bracket, the platform is characterized in that the supporting framework is provided with the plurality of crosspieces; the table board bracket is sleeved on the supporting framework; the moving bracket is mounted in the table board bracket and is sleeved on the supporting framework; the working table board is fixedly connected with the table board bracket; the working table board is provided with a first positioning block and the moving bracket is arranged above the working table board; the moving bracket is provided with a second positioning lock; one end of the resetting spring is connected with the bottom of the moving bracket; the pedal is arranged between the moving bracket and the working table board. Compared with the prior art, the stepping type hoisting platform has the advantages of simple structure, low construction cost, accordance with human engineering, capability of meeting the requirements of different working types, high safety, light weight, convenience for carrying, high working efficiency and convenience for installation.

Disclosed is a large-span subway station underground excavation construction method for a hard rock stratum. The large-span subway station underground excavation construction method for the hard rock stratum is used for effectively reducing the excavation construction risk and improving the excavation construction efficiency. The large-span subway station underground excavation construction method for the hard rock stratum comprises the following steps that the arch portion middle of a station is divided into two steps to be excavated, a tunnel arch portion middle upper step is excavated, and an initial support arch cover of the tunnel arch portion middle is constructed; a tunnel arch portion middle lower step is excavated; a tunnel arch portion left side portion and a tunnel arch portion right side portion are excavated, feet-lock bolts are constructed at the arch foot positions, the initial support arch cover on the arch top is lengthened through connection, and construction of the initial support arch cover is accomplished; a rock mass arranged below the station is excavated in a slot broaching mode under the protection action of the initial support arch cover, nine portions including upper steps on the left portion, the middle portion and the right portion, middle steps on the left portion, the middle portion and the right portion and lower steps on the left portion, the middle portion and the right portion are excavated, and side wall initial supports of corresponding sections are constructed until the rock mass is excavated to the bottom; and a station body structure is sequentially constructed from bottom to top, and station construction is accomplished.

The invention discloses a foundation pit supporting method used below an existing comprehensive pipe rack and relates to existing comprehensive pipe racks and to-be-built tunnel box culverts crossed below the existing comprehensive pipe racks. The foundation pit supporting method is characterized by comprising the following steps: at the crossed position, at least one working well is arranged on each of two sides of a comprehensive pipe rack, a longitudinal pipe-roof is arranged in each of the working wells, and a horizontal pipe-roof is arranged at the bottom of each of the working wells, and the longitudinal and horizontal pipe-roofs are jacked into soil between the working wells on the two sides in the longitudinal direction of the to-be-built tunnel box culvert; after that, the to-be-built tunnel box culvert is constructed. The foundation pit supporting method has the advantages that the construction environment is good, the risk is relatively low, the deformation is controllable, and influence on the existing comprehensive pipe rack above is avoided.

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 relates to a Raschel machine, which comprises a plurality of flower guide bars (2) forming at least one cluster, wherein each flower guide bar is provided with a shifting driving device (7) and the flower guide bars (2) of one cluster are superposed on a piling direction. In order to achieve the purpose of acquiring a Raschel machine having simple structure, each flower guide bar (2) is connected to the shifting driving device (7) through a prolonging element (8) which has a function of guiding in a guiding device (9).

The invention discloses a prestress loading device connecting part which comprises a loading base, a nut, a screw rod and a screw rod base. A groove for placing a jack is formed in the loading base. A screw rod inserting hole is formed in one side of the groove. A connecting flange A is arranged on the opposite side of the screw rod inserting hole of the loading base. One end of the screw rod is inserted into the screw rod inserting hole. The other end of the screw rod is fixedly connected with the screw rod base which is provided with a connecting flange B on the side opposite to the side connected with the screw rod. The connecting flange B and the nut which abuts against the loading base can be in thread connection with the portion, except the screw rod inserting hole, of the screw rod. According to the technical scheme, prestress is exerted on a whole supporting-protecting structure, the overall intensity of a supporting-protecting system is improved, assembling and disassembling are convenient, multi-time repeated using can be achieved, and the purpose that construction cost is saved, and construction is convenient is achieved.

The invention provides a quick emergency diagonal bracing for foundation pit salvage, and a construction method, and belongs to the technical field of building construction. The quick emergency diagonal bracing is used for effectively relieving the situation that during large-area, deep-foundation-pit and support-free earth excavation, the stress and deformation speed of a foundation pit enclosurewall are too large, and thus the potential safety hazard to a site is generated. According to the quick emergency diagonal bracing, a first pre-embedded piece is mounted on the side wall, close to the inner side of a foundation pit, of a retaining type enclosure structure at a foundation pit platform in the vertical direction of the retaining type enclosure structure, a second pre-embedded pieceis mounted on a thickened cushion layer at the bottom of the foundation pit, then the two ends of a profile steel support manufactured by a plant are connected with the first pre-embedded piece and the second pre-embedded piece in a full weld mode correspondingly to form the diagonal bracing, and thus the diagonal bracing serve as an emergency rescue measure of the foundation pit; the profile steel support can effectively shorten the emergency salvage time so as to shorten the construction period; the large construction space is saved for construction of a structure body; and the stress form of the profile steel support is good, the stress of the foundation pit enclosure wall and the stress of soil body bulges are counteracted mutually, and the foundation pit enclosure form can be reinforced effectively.

The invention relates to an arch column method for building a large-scale underground structure in shallow buried rock stratums. The method comprises the following steps of: 1, separately excavating underground one-storey middle pilot tunnels, constructing primary supports, and constructing pile foundations and steel pipe columns at the positions of middle columns; 2, constructing secondary linings including underground one-storey floors, steel pipe columns, roof timbers, roof arches and the like, and waterproof layers in middle tunnels; 3, symmetrically excavating underground one-storey two-side pilot tunnels, constructing primary supports, and constructing pile foundations and side columns under side walls; 4, constructing secondary linings including floors, vertical walls, edge arches and the like in side tunnels and waterproof layers, and disassembling temporary supports; 5, under the protection of underground one-storey structures, downwards excavating an underground second-storey structure with large-scale machinery, besides, constructing side wall bolt spray supports or slab rib type anchored bolt retaining wall supports, and pouring underground second-storey floors, side walls and waterproof layers; and 6, sequentially downwards excavating a plurality of underground storeys, besides, constructing side wall supports, and pouring floors, side walls and waterproof layers of corresponding storeys. The method disclosed by the invention is convenient to construct, high in efficiency, small in construction risks, good in stratum deformation control, and low in building cost.