30results about How to "Ensure normal excavation" patented technology

The invention relates to the technical field of tunnel construction, in particular to an advanced radial water lowering channel system and an advanced radial water lowering method. The advanced radial water lowering channel system comprises a horizontal water lowering channel, a communication ring pipe, a vacuum filter pipe, an evacuated water lowering main pipe and a vacuum water lowering pump, the horizontal water lowering channel is arranged in a tunnel surrounding rock to be excavated, the vacuum filter pipe is inserted into the tunnel surrounding rock outside the horizontal water lowering channel, water in the tunnel surrounding rock enters the vacuum filter pipe under the action of the vacuum water lowering pump, enters the communication ring pipe through a joint, enters the evacuated water lowering main pipe through a communication short pipe and finally is drained through the vacuum water lowering pump, water lowering effects are obvious, field implementation is easy, characteristics of weak surrounding rocks are improved, saturated water level is reduced below an excavation line, and excavation of a subsequent tunnel is ensured.

The invention provides a vacuum preloading film pressing groove extension construction method which includes the steps of film pressing groove extension and sealing film laying. In the film pressing groove extension step, an original film pressing groove which can not be dug to an airtight layer is horizontally moved to the outer side of a region, and digging is performed after the position of the film pressing groove is determined again so as to guarantee that a sealing film can be pressed in a film pressing groove airtight soil layer after film pressing groove extension. In the sealing film laying step, after film pressing groove extension, the size of the sealing film is adjusted according to actual extension size, the sealing film is laid, and a vacuum preloading construction stage starts after sealing film laying. The vacuum preloading film pressing groove extension construction method is convenient to use, it can be ensured that digging can be performed to the airtight layer, the sealing effect is guaranteed, and the preloading effect of a whole vacuum preloading area is guaranteed.

The invention relates to a foundation pit earthwork construction method for civil air defense engineering, and belongs to the technical field of civil air defense engineering construction. The foundation pit earthwork construction method for civil air defense engineering comprises the steps that step 1, after surveying and setting out of a deep foundation pit are completed, the deep foundation pit is divided into M areas from south to north, each area is divided into N<q> construction sections from west to east, and the corresponding mark number of each construction section is defined as MN<q> (p is larger than 2, q is larger than 4, and p and q are both positive integers); step 2, before the corresponding construction section is excavated, precipitation pipe well construction is conducted on the construction section; step 3, according to a foundation pit design drawing, excavation is conducted in a partitioned, segmented and layered mode from west to east in a backward sequence; when a (q-1) th foundation pit is excavated, layered excavation is carried out from west to east, excavation sections are M<1>N<q-1>, M<2>N<q-1>... MN<q-1> sections, excavation sections of a qth foundation pit are M<1>N<q>, M<2>N<q>... MN<q> sections, layered excavation is carried out from south to north, and riding tracks are arranged at the M<1>N<q> section; and step 4, according to the mode in step 3, excavation of the foundation pit is completed. The construction efficiency can be improved, and the construction quality is guaranteed.

The invention relates to an S-shaped curve based method for control a track of a shield tunneling machine. The method comprises the steps of obtaining horizontal and vertical curve elements of a tunnel design axis; obtaining mileages of terminal points of S-shaped curves, which are set initially; calculating coordinates and azimuth angles at positions of mileages of terminal points of S-shaped curves; obtaining real-time attitude data of the shield tunneling machine; establishing the horizontal S-shaped curve; correcting mileages of terminal points of S-shaped curves; establishing the vertical S-shaped curve; judging whether the minimum curvature radiuses of S-shaped curves are less than the minimum turning radius of the shield tunneling machine or not, and obtaining mileages of terminal points of S-shaped curves again if the minimum curvature radiuses of S-shaped curves are less than the minimum turning radius of the shield tunneling machine; calculating an ideal stroke of a jack after the shield tunneling machine tunnels one ring along S-shaped curves; converting data of the ideal stroke into the required oil cylinder hydraulic pressure; and transmitting calculation results to the shield tunneling machine by a computer, controlling the shield tunneling machine to tunnel forward, and judging in real time whether S-shaped curves are required to be reconstructed or not. Compared with the prior art, the method has the advantages of being capable of finishing deviation rectification once, high in generality, capable of reducing the fluctuation of the track of the shield tunneling machine and the like.

The invention relates to a construction method for an underground tunnel, in particular to a construction method for a river-crossing shield tunnel crushed stratum communication channel, which is used for solving the problems of failure of stratum reinforcement, long working period, high cost, poor quality and the like existing in the construction process of the conventional river-crossing shieldtunnel crushed stratum communication channel. The method comprises the following steps of: determining the position of the communication channel; before opening, performing pre-grouting to integrallyconsolidate broken rock outside the excavation outline of the communication channel; forming a high-strength waterproof curtain; before excavation, performing stress conversion; drilling and partitioning to remove a left line pipe sheet, brushing the top, performing tunnel excavation with a combined damping burst technology, and timbering; and drilling and partitioning to remove a right line pipesheet, brushing the top, and performing second lining construction by adopting a combination template. Due to the adoption of the construction method, water seepage is avoided after excavation, the technology is advanced, the blank of a communication channel pre-grouting technology is fulfilled, the working period is short, the mechanical degree is high, the process is simple, construction is environmentally-friendly, collapse is avoided, and over-excavation is greatly lowered; and the method has a wide application range.

The invention discloses a protective construction method of excavating a large area deep foundation pit in a running sand confined water soil layer. The method comprises the steps of: firstly, controlling the precipitation depth of the deep foundation pit in a range of 500mm to 1000mm below the excavation surface; disposing a circle of sandless tubular wells around the outer periphery of the deepfoundation pit, wherein each sandless tubular well is 2 meters far from the deep foundation pit edge, 6 to 10 meters deeper than the bottom of the deep foundation pit, and 15 to 20 meters far from the neighboring sandless tubular well; laying reinforcing steel mesh sheets and disposing a circle of light-duty wellpoints on an inward side slope of the deep foundation pit; after starting the excavation, arranging a soil nail wall provided with weep holes for anchoring on a side slope of silty sand layer and silty clay layer with silt seam. By the method in the invention, the excavation of the large area deep foundation pit in the running sand confined water soil layer is ensured to be smooth, with no need to enlarge the excavation area. The difficulty of construction and the construction cost are lowered and the construction period is shortened.

The invention discloses an underwater large-diameter shield continuous excavation construction tool with a deformed tail shield, which includes a water delivery unit, a plurality of high-pressure water bladders and a plurality of guide strips, and the high-pressure water bladders are respectively fixed on the inner wall of the tail shield shell , and is located between the inner wall of the tail shield shell and the outer peripheral surface of the segment ring. The water delivery unit includes industrial water tanks, input water pipes, high-pressure water pumps, output water pipes and end hoses. A group of several high-pressure water bag input water pipes are connected in parallel to form a total input water pipe. The end hose of the water delivery unit passes through a quick connector, the main input The water pipe is connected with a group of several high-pressure water bladders. The construction method of the present invention includes 1) separately installing high-pressure water bladders and connecting them with water delivery units, 2) assembling a segment ring, and 3) sequentially completing the water injection and pressurization of the high-pressure water bladder units in a segment ring. 4) Shield tunneling and monitoring. The invention can prevent the inner wall of the deformed tail shield shell from extruding the tube piece, reduces the damage of the tube piece in the forming tunnel, improves the construction efficiency and reduces the construction cost.

The invention discloses a construction method for an anti-scouring discharge channel of a dammed lake. The side slope steel wire mesh is laid on both side slopes of the discharge channel, a reinforced geomembrane is laid on the bottom of the discharge channel, and a reinforced geomembrane is laid on the side slopes on both sides Reinforced gabions are set at the bottom of the slope, and multiple rows of prefabricated pier stones are set in the discharge channel. A single row of prefabricated pier stones is arranged along the width direction of the discharge channel. A single prefabricated pier stone is fixed at the bottom of the discharge channel through the first anchor rod. Adjacent prefabricated pier stones are connected by second anchor rods, and the second anchor rods close to the slope are fixedly connected on both sides of the slope; the discharge trough constructed by the construction method of the present invention can effectively reduce the scouring intensity of water flow and flow velocity, enhance the anti-scouring ability of the slopes on both sides of the discharge trough and the bottom of the trough, and reduce damage and loss to the downstream. The construction method of the invention has a short construction time, can shorten the emergency preparation time as much as possible, can ensure the excavation of the discharge tank and the reinforcement of the tank body in a short time, and various geotechnical materials used in the construction process are cheap.

The invention provides a planet wheel type profiling excavation device for construction of a rectangular-cross-section tunnel which is used for solving the problems that an excavation bland area is large, a cutting effect of soil mass is poor, the structure is complex, the adaptability of the cross section is poor existing in an existing excavation device. The plant wheel type profiling excavationdevice comprises a cutter disc, a planet wheel, a planet wheel shaft, a planet carrier, a large gear ring and a shield body. The cutter disc is in a water-drop shape, and the rear portion of the cutter disc is engaged with the planet wheel shaft. The planet wheel shaft is connected with the planet carrier through a bearing, and the rear portion of the planet carrier is connected with an externaldriving device. The planet wheel is arranged on the planet wheel shaft, the planet wheel is arranged in the large gear ring, the planet wheel is engaged with the large gear ring, and the outer side ofthe large gear ring is fixed to the shield body. The planet wheel type profiling excavation device ensures full-section excavation, different excavation sections can be formed, excavation of rectangular-cross-section tunnels in various specifications can be achieved, and the good economical efficiency, adaptability and reliability are achieved. Meanwhile, the planet wheel type profiling excavation device has a good soil mass cutting effect and good cross section adaptability.

The invention relates to a shallow burial soil area shield driving stratum strengthening system and a construction method thereof. Tunneling under the condition of shallow burial soil can lead to disadvantages of unstability and collapse of a shield method tunnel cutting face, upheaval and settlement of earth surface and the like. Uplift piles which are arranged in rows are vertically arranged between a two-way shield tunnel and the two sides of the two-way shield tunnel, the tops of the uplift piles at the two sides are provided with rectangular ring beams, and a two-way multi-ribbed plate is arranged in each ring beam; each two-way multi-ribbed plate is composed of concrete front-panels and two-way multi-ribbed beams which are arranged on the bottom faces of the concrete front-panels, and the two-way multi-ribbed beams are distributed in a transverse and longitudinal crossed grid-shaped mode; the concrete front-panels and the two-way multi-ribbed beams adopt integral formwork erection, and one-time pouring forming is achieved; the ring beams are connected with the two-way multi-ribbed plates to form a whole through rebar connectors reserved in the inner sides of the ring beams. According to the shallow burial soil area shield driving stratum strengthening system and the construction method thereof, stratum upheaval and settlement deformation caused by shield driving pressure under the condition of shallow burial soil can be effectively blocked, the adverse impact on a running tunnel below ground caused by temporary overload on the ground after completion of work can be reduced, and normal driving for the shield tunnel in the shallow burial soil area can be guaranteed.

A subway station construction method belongs to underground build technology field. The method includes subway station enclosing and protection, the construction of load carrying structure-underground continue wall, executing deep layer high-pressure grouting for the ground base soil layer in the continue wall, casting-in-place ferroconcrete to the top of the continue wall to form the top plate of the subway station, casting-in-place ferroconcrete counterfort moving beam or mounting prefabricated counterfort moving beam on the low side of the first layer floor plate under the top plate and the periphery of the continue wall and proceeding the construction of the floor plate of the layer, proceeding the following layer construction by the passages among layers, constructing the reverse arched bottom plate. The invention adopts inverse construct method, the construction quantity is small, the construction efficiency is high and the construction quality is good.

The invention discloses a construction method for excavating and supporting a foundation pit of a shield receiving well without precipitation. Combined to form the side wall of the foundation pit of the shield receiving shaft; the bottom of the foundation pit and the inner and outer sides of the side wall of the foundation pit are respectively grouted to form a bottom water-stop curtain, an inner water-stop curtain and an outer water-stop curtain, and the water-stop curtain is integrally formed , a gap groove is formed between the water-stop curtains on the inside and outside of the side wall of the foundation pit; the water in the foundation pit is drained, and part of the water in the gap groove is extracted, so that the water level in the gap groove is between the ground level and the bottom surface of the foundation pit, Then construct crown beams and ground water retaining walls; excavate the foundation pit, excavate in layers from top to bottom, and set up multiple supports for each layer. The method of the invention solves the problem of safe construction under the condition of no precipitation during the excavation and support construction of the foundation pit of the shield receiving shaft.

The invention provides a filling device and method for an abandoned air-raid shelter in a pile foundation construction site. The filling method is to drill a grouting hole above the abandoned air-raid shelter to be filled, and install a primary grouting pipe, a secondary grouting pipe, an air supply pipe and an exhaust pipe, a primary grouting pipe and a delivery pipe in the borehole. The air pipe extends vertically into the bottom of the air-raid shelter, and the secondary grouting pipe and exhaust pipe extend vertically to the roof of the air-raid shelter; firstly, the primary grouting pipe is connected to the grouting pump, and the air supply pipe is connected to the air compressor, and the foam is injected in layers Concrete grouting slurry, after each layer of grouting, pull up the primary grouting pipe and the air supply pipe to the top of the cave; then connect the secondary grouting pipe to inject the foam concrete grouting slurry for the second time, and the secondary grouting does not supply air. The invention can solve the filling problem of the deep-buried air-raid shelter without excavation, and the filled construction site can ensure the normal construction of bored piles, which solves the problem that the deep-buried air-raid shelter cannot be normally constructed when the rotary drilling rig is constructing the poured pile foundation and site subsidence.

The invention discloses a geomechnical model test complex structure cavern group excavating positioning device and method. The geomechnical model test complex structure cavern group excavating positioning method comprises the main steps that (1) an excavation initial point is positioned, specifically, through transverse and vertical positioning groove holes in excavation positioning plates, the position of a tool bit of an excavation device is accurately and finely adjusted, and positioning of the excavation initial point is completed; (2), the excavation orientation is positioned, specifically, through combination of a total station and software, the excavation orientation is determined, by adjusting foot screws on the excavation positioning plates, the orientation of the exaction deviceis accurately adjusted, and positioning of the excavation orientation is completed; and (3), deviation rectifying monitoring is conducted in the excavation process, specifically, after excavation positioning is completed, the position and angle of the total station are kept to be unchanged, andthe deviation of the excavation orientation is monitored in real time through a laser indicator lamp of the total station, and rectified in time. The geomechnical model test complex structure cavern group excavating positioning device and method have the following advantages that (1) the excavation positioning accuracy is high; (2) operation is easy and convenient, and disturbance to a model frame is small; and (3) the excavation orientation can be monitored in real time and rectified in time in theexcavation process.

The invention discloses a device judging whether or not an earth pressure balance shield earth chamber is full. The device comprises a pressure detector disposed on the upper portion of a front shield earth chamber of the earth pressure balance shield; the signal output end of a pressure sensor is connected with an upper computer; the upper computer judges whether or not the chamber is full; if not, a warning signal is sent to an alarm unit. The device has the advantages that whether or not the earth chamber is full can be judged anytime during earth pressure balance shield tunneling, full-chamber shield tunneling can be ensured and the application of full-chamber tunneling decreases the danger of collapse ahead.