Cold and hot alternating hard rock pipe jacking construction equipment and method

Abstract

The invention provides cold and hot alternating hard rock pipe jacking construction equipment and method. A lateral confinement tunneling device is arranged at the front end of a pipe jacking, and an annular groove is formed through drilling; the lateral confinement tunneling device structurally comprises a fixed ring seat, a driving seat, a sliding support and a drill bit driving device; the fixing ring base is of an annular cylindrical structure and located at the front end of the jacking pipe. The driving seat is of an annular cylindrical structure, the driving seat is located in the fixing ring seat and connected with the fixing ring seat in a relatively rotating mode, and a revolution driving device is further arranged to drive the driving seat to rotate; the sliding support is of an annular cylindrical structure, is located in the driving seat and is driven by the driving seat to rotate, meanwhile, the sliding support is driven by a telescopic oil cylinder to reciprocate in the axial direction, a drill bit driving device is arranged at the position, close to the edge, of the sliding support and used for being connected with a drill bit, and the working face of the drill bit faces a tunnel face. The diameter of the drill bit is the same as the width of the annular groove. And the tunneling efficiency of the annular groove is greatly improved by adopting an alternate cooling and heating mode.

Description

Technical Field

[0001] The invention relates to the field of tunnel construction, in particular to a cold and hot alternating hard rock pipe jacking construction equipment and method. Background Art

[0002] The existing hard rock pipe jacking machine adopts the full-section excavation method during construction. During the construction of a certain project, the hard rock section was encountered after excavating about 70 meters. The thickness of the hard rock is expected to exceed 100 meters, and the compressive strength of the surrounding rock gravel reaches 117MPa. The cutter head cuts the rock working surface, with a large contact area, which is time-consuming and labor-intensive, and the cutter head needs to be replaced frequently, resulting in extremely low construction efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a hot and cold alternating hard rock pipe jacking construction equipment and method, which can greatly improve the hard rock excavation efficiency, greatly reduce the excavation cost, and reduce the loss of the cutter head.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a hot and cold alternating hard rock jacking construction equipment, including a side limit excavation device, the side limit excavation device is used to be arranged at the front end of the jacking pipe, and drilled to form an annular groove; The structure of the side limit excavation device includes: a fixed ring seat, a driving seat, a sliding support and a drill driving device; The fixed ring seat is an annular cylindrical structure, and the fixed ring seat is located at the front end of the top pipe; The driving seat is an annular cylindrical structure, the driving seat is located inside the fixed ring seat, and is connected to the fixed ring seat so as to be relatively rotatable, and is also provided with a revolution driving device to drive the driving seat to rotate; The sliding support is an annular cylindrical structure. The sliding support is located in the driving seat and is driven to rotate by the driving seat. At the same time, the sliding support is driven by the telescopic cylinder to reciprocate axially. A drill bit driving device is provided near the edge of the sliding support. The drill bit driving device is used to connect with the drill bit. The working surface of the drill bit faces the palm face, and the diameter of the drill bit is the same as the groove width of the annular groove.

[0005] In a preferred solution, a flame nozzle is provided on the sliding support, and the flame nozzle faces the direction of the annular groove; A water channel is provided on the drill bit; The flame nozzle and the water channel are connected to a multi-media supply pipeline for inputting fuel and water to alternately heat or cool the surrounding rock.

[0006] In a preferred solution, the flame nozzle is located between the drill driving devices on the circumference.

[0007] In a preferred embodiment, the fuel of the flame nozzle includes butane, acetylene, natural gas, liquefied petroleum gas or hydrogen; The flame nozzle is used to heat the surrounding rock in the annular groove to 100~650℃.

[0008] In a preferred embodiment, the flame nozzle is also used to input air or oxygen to improve combustion efficiency.

[0009] In a preferred solution, a heat insulating cover is provided at the position of the sliding support located inside the drill bit. The heat insulating cover is a cylindrical structure, and a heat insulating layer is provided on the inner wall of the heat insulating cover. The heat insulating cover is used to block the heat generated by the fuel.

[0010] In the preferred solution, a slag removal blade is provided on the end face of the sliding support, one end of the slag removal blade is fixedly connected to the sliding support, and the other end is a free end, which extends toward the drill bit and is located in an annular groove. The rock slag is discharged through the slag removal blade by rotation.

[0011] In the preferred solution, a connecting ring is provided in the middle of the sliding support, an opening is provided on the connecting ring, the diameter of the opening is greater than or equal to the diameter of the core, and a slag chute is provided at the opening, the slag chute is used to discharge the slag falling from the slag removal blades.

[0012] In a preferred solution, a spline connection is adopted between the sliding support and the driving seat, so that the driving seat can drive the sliding support to rotate without affecting the axial sliding of the sliding support; An inner gear ring is provided on the inner wall of the driving seat, a revolution driving device is fixedly provided on the inner wall of the fixed ring seat, an output shaft of the revolution driving device is provided with a revolution driving gear, and the revolution driving gear is meshed and connected with the inner gear ring to drive the driving seat to rotate; A push-pull slip ring is arranged on the end surface of the sliding support, a telescopic oil cylinder is fixedly arranged on the inner wall of the fixed ring seat, a piston rod of the telescopic oil cylinder is connected with a push-pull head, the push-pull head is located in the push-pull slip ring and is slidably connected with the push-pull slip ring.

[0013] In a preferred solution, the push-pull slip ring is a circular ring structure, and a groove with a circular arc cross section is provided on the push-pull slip ring, the opening of the circular arc groove faces the telescopic oil cylinder, and the width of the opening is smaller than the diameter of the circular arc groove; A ball head is arranged at the free end of the push-pull head. The ball head is located in the arc-shaped groove. The diameter of the ball head is smaller than the width of the opening of the arc-shaped groove.

[0014] In a preferred solution, the outer wall of the fixed ring seat is provided with a stepped structure; A guide sleeve is provided between the head end of the fixed ring seat and the sliding support, and a sealing ring is also provided between the head end of the fixed ring seat and the sliding support; The tail end of the fixed ring seat is sleeved with the top pipe section through a step structure.

[0015] In the preferred solution, a tunneling correction device is also provided between the fixed ring seat and the jacking pipe section.

[0016] In a preferred solution, the drill driving device is provided with a hydraulic motor, and the multimedia supply pipeline is also connected to the hydraulic motor of the drill driving device; A multi-media rotary joint is provided on the multi-media supply pipeline, and the multi-media rotary joint is arranged at the position of the rotating axis of the sliding support to supply hydraulic oil to the hydraulic motor, fuel and auxiliary gas to the flame nozzle, and cooling water to the water channel through the multi-media supply pipeline.

[0017] In a preferred embodiment, in the multi-media rotary joint, the first rotary joint, the second rotary joint, the third rotary joint and the fourth rotary joint are coaxially sleeved from outside to inside, the annular cavity between the walls of each rotary joint constitutes a channel for the circulation of the medium, the wall of each rotary joint is provided with a relatively rotating and sealed structure, the pipelines of the rotary joints located on the periphery are led out from the side walls, and the pipelines of the rotary joints located in the middle are directly led out.

[0018] In the preferred solution, a multifunctional anchor drilling rig is also provided, and the multifunctional anchor drilling rig is used to drill fracturing holes on the rock core; the multifunctional anchor drilling rig is also used to send the rock core fracturing device into the fracturing hole; The core fracturing device is connected to the fracturing pump.

[0019] In a preferred embodiment, in the core fracturing device, an inner wedge is provided between the plurality of outer wedges, and the inclined surfaces between the outer wedge and the inner wedge fit each other; Initially, the common circumscribed circle diameter of the plurality of outer wedge blocks is smaller than the inner diameter of the fracturing hole, and the inner wedge block moves axially so that the common circumscribed circle diameter of the plurality of outer wedge blocks is larger than the inner diameter of the fracturing hole; The inner wedge block is fixedly connected to the pull rod, and the pull rod is fixedly connected to the fracturing hydraulic cylinder to drive the inner wedge block to move axially.

[0020] In the preferred solution, a cushion seat is further provided, which is fixedly connected to the fracturing hydraulic cylinder. A limiting through hole is provided on the cushion seat, and the pull rod passes through the limiting through hole and is connected to the fracturing hydraulic cylinder.

[0021] In a preferred solution, the diameter of the limiting through hole is smaller than the inner diameter of the fracturing hole to prevent the outer wedge from falling out.

[0022] In a preferred solution, in the drill driving device, the output shaft of the hydraulic motor is connected to the shaft of the drill through a transmission mechanism, and the axis of the drill is not coaxial with the output shaft of the hydraulic motor; Alternatively, the hydraulic motor is partially embedded in the side wall of the sliding support, and the output shaft of the hydraulic motor is connected to the shaft of the drill bit directly or through a speed reducer.

[0023] A construction method using the above-mentioned hot and cold alternating hard rock pipe jacking construction equipment comprises the following steps: S1, using the side limit excavation device to excavate at the front end of the top pipe to form an annular groove; During the excavation process, the drill bit rotates and the sliding support drives the drill bit to revolve; The flame nozzle sprays gas to heat the surrounding rock face corresponding to the annular groove to above 100°C, and water is sprayed from the drill bit to cool the heated position. The surrounding rock is broken by alternating hot and cold to improve drilling efficiency. S2, driving the sliding support to feed with a telescopic oil cylinder, stopping the excavation after reaching the preset footage, drilling multiple fracturing holes on the rock core formed in the middle of the annular groove, and cleaning the holes; S3, inserting multiple core fracturing devices into the fracturing hole, inputting hydraulic oil into the fracturing hydraulic cylinder, so that the common circumscribed circle diameter of the multiple outer wedges increases until the core is cracked; S4. Clean up the crushed rocks and push the pipe section into the preset depth; S5, repeat steps S1 to S4; The above steps can realize the rapid construction of hard rock pipe jacking.

[0024] In the preferred embodiment, The radial pressure output by multiple external wedges is greater than 25MPa; The flame nozzle is located downstream of the drill bit and close to the upstream drill bit; The heating temperature of the flame nozzle is 150~400℃; The revolution speed of the drill bit is less than 50 rpm; The single excavation depth of the annular groove is 30~120cm; The media supplied from outside to inside of the multi-media rotary joint are: oxygen or air, water, fuel and hydraulic oil; An excavation deviation correction device is provided between the side limit excavation device and the jacking pipe section. A plurality of jacking cylinders distributed along the circumference are provided in the excavation deviation correction device to realize the overall feeding and deviation correction operation of the side limit excavation device.

[0025] The present invention provides a hot-cold alternating hard rock pipe jacking construction equipment and method, which can greatly improve the excavation efficiency by adopting a construction method of first excavating an annular groove and then fracturing the rock core. The excavation efficiency of the annular groove is further improved by using the hot-cold alternating method to assist in the excavation of the annular groove. The core fracturing device can use the characteristic that the tensile strength of hard rock is much lower than the compressive strength to quickly crush the core, greatly reduce the wear of the cutter head, and further improve the excavation efficiency. The present invention is particularly suitable for pipe jacking construction with a larger cross section, such as a pipe jacking construction with a cross section of up to 2 meters. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2It is a schematic structural diagram of the side limit excavation device of the present invention.

[0028] Figure 3 It is a cross-sectional schematic diagram of the drill bit position of the present invention.

[0029] Figure 4 It is a front view of the multimedia rotary joint of the present invention.

[0030] Figure 5 It is a cross-sectional schematic diagram of the multimedia rotary joint of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the core fracturing device of the present invention.

[0032] In the figure: side limit excavation device 1, drill bit 101, drill bit drive device 102, slag removal blade 103, flame nozzle 104, heat insulation cover 105, sliding support 106, drive seat 107, internal gear ring 108, revolution drive device 109, push-pull slip ring 110, telescopic cylinder 111, fixed ring seat 112, water channel 113, connecting ring 114, push-pull head 115, revolution drive gear 116, multi-media supply pipeline 2, supply pipeline 201, multi-media rotary joint 202, first rotary joint 203, second Rotary joint 204, third rotary joint 205, fourth rotary joint 206, multi-media supply pipeline 207, multi-media supply station 208, sliding pad 209, surrounding rock 3, core 301, annular groove 302, fracturing hole 303, multi-functional anchor drilling rig 4, fracturing fluid supply pump 5, jacking pipe section 6, slag chute 7, correction device 8, core fracturing device 9, outer wedge block 901, inner wedge block 902, pull rod 903, cushion seat 904, limit through hole 905, fracturing hydraulic cylinder 906, excavation correction device 10. DETAILED DESCRIPTION

[0033] Embodiment 1: like Figures 1 to 3 In the invention, a hot and cold alternating hard rock jacking construction equipment includes a side limit excavation device 1, which is used to be arranged at the front end of the jacking pipe and drilled to form an annular groove 302; by this scheme, after eliminating the side limit of the core 301, it is convenient to break the core by fracturing, thereby greatly improving the excavation efficiency of hard rock. Moreover, compared with the full-section excavation method, the side limit excavation device 1 of the present invention can centrally process the high-precision annular groove 302, so that the formed annular groove 302 has high dimensional accuracy, which is convenient for the jacking of the jacking pipe section 6 and reduces the breakage rate of the jacking pipe section 6 during the jacking process.

[0034] The structure of the side limit excavation device 1 includes: a fixed ring seat 112, a driving seat 107, a sliding support 106 and a drill driving device 102; The fixed ring seat 112 is an annular cylindrical structure, and the fixed ring seat 112 is located at the front end of the jacking pipe; preferably, a tunneling correction device 10 is provided between the fixed ring seat 112 and the jacking pipe section 6, and the tunneling correction device 10 is provided with a plurality of hydraulic cylinders evenly distributed along the circumference, so as to adjust the tunneling direction of the side limit tunneling device 1 by lifting the hydraulic cylinder to match the design parameters.

[0035] The driving seat 107 is an annular cylindrical structure. The driving seat 107 is located in the fixed ring seat 112 and is connected to the fixed ring seat 112 so that it can rotate relative to each other. A revolution driving device 109 is also provided to drive the driving seat 107 to rotate. The present invention adopts a self-rotation + revolution excavation method, which is convenient for efficiently and accurately processing the structure of the annular groove 302, so as to facilitate the subsequent jacking of the jacking pipe section 6.

[0036] The sliding support 106 is an annular cylindrical structure, and the sliding support 106 is located in the driving seat 107 and driven to rotate by the driving seat 107. At the same time, the sliding support 106 is driven by the telescopic oil cylinder 111 to reciprocate along the axial direction. A drill driving device 102 is provided near the edge of the sliding support 106. The drill driving device 102 is used to connect with the drill 101. The working surface of the drill 101 faces the tunnel face, and the diameter of the drill 101 is the same as the groove width of the annular groove 302. With this structure, the feeding of the drill bit is realized by the telescopic oil cylinder 111.

[0037] The preferred solution is Figures 1 to 3 In the embodiment, a flame nozzle 104 is provided on the sliding support 106, and the flame nozzle 104 faces the direction of the annular groove 302; that is, the flame nozzle 104 slides with the sliding support 106, that is, as the drill bit is fed, the flame ejected from the flame nozzle 104 heats the bottom of the annular groove 302.

[0038] A water channel 113 is provided on the drill bit 101 ; the water channel 113 is used to provide water for cooling the rock and also to reduce the temperature of the drill bit 101 .

[0039] The flame nozzle 104 and the water channel 113 are connected to the multimedia supply pipeline 2 for inputting fuel and water to alternately heat or cool the surrounding rock 3.

[0040] The preferred solution is Figure 3 In the embodiment, the flame nozzle 104 is circumferentially located between the drill bit driving devices 102. Preferably, the flame nozzle 104 is located near the downstream of the drill bit 101, that is, after the drill bit 101 cuts the rock, the flame nozzle 104 passes through the cutting surface and heats the rock, and then the cooling water sprayed by the next drill bit 101 cools the cutting surface to cause cracks in the rock.

[0041] In a preferred solution, the fuel of the flame nozzle 104 includes butane, acetylene, natural gas, liquefied petroleum gas or hydrogen; preferably, hydrogen is used as the fuel to avoid the waste gas from affecting the construction personnel. Alternatively, butane is used as the fuel. An exhaust pipe is also provided at the top near the side limit excavation device 1 to discharge the waste gas to the outside of the cave, and a blower is provided on the exhaust pipe.

[0042] The flame nozzle 104 is used to heat the surrounding rock in the annular groove 302 to 100-650° C. Preferably, the heating temperature is 150-250° C. At this temperature, the impact on the drill bit 101 and other components is small, the required energy consumption is low, and the revolution speed can be greatly increased, which is sufficient to meet the need of crushing rocks by using temperature difference.

[0043] Preferred solution Figure 1 The flame nozzle 104 is also used to input air or oxygen and other combustion-aiding gases to improve the combustion efficiency. The multimedia supply station 208 outputs fuel and oxygen to the flame nozzle 104. It also provides hydraulic oil to the hydraulic motor of the revolution drive device 109, the telescopic cylinder 111 and the hydraulic motor of the drill drive device 102.

[0044] The preferred solution is Figure 2 In the embodiment, a heat insulating cover 105 is provided at a position where the sliding support 106 is located inside the drill bit 101, that is, the heat insulating cover 105 is located near the core 301 to gather the energy of the fuel, and at the end surface of the connecting ring 114 of the sliding support 106, the heat insulating cover 105 extends toward the inner wall of the surrounding rock 3, thereby preventing the flame from affecting other components, such as bearings, pipelines and other mechanisms.

[0045] The heat insulating cover 105 is a cylindrical structure, and a heat insulating layer, such as an aerogel heat insulating layer, is provided on the inner wall of the heat insulating cover 105. The heat insulating cover 105 is used to block the heat generated by the fuel to avoid damage to other components.

[0046] The preferred solution is Figure 1 , 3 In the middle of the sliding support 106, a connecting ring 114 is provided, and an opening is provided on the connecting ring 114. The diameter of the opening is greater than or equal to the diameter of the core 301. A slag chute 7 is provided at the opening. The slag chute 7 is roughly semi-arc-shaped. The slag chute 7 is used to receive and discharge the rock slag falling from the slag removal blade 103.

[0047] The preferred solution is Figure 2In the embodiment, a slag removal blade 103 is provided on the end surface of the sliding support 106. One end of the slag removal blade 103 is fixedly connected to the sliding support 106, and the other end is a free end. The free end extends toward the drill bit 101 and is located in the annular groove 302. The rock slag is discharged through the slag removal blade 103 by rotation. During the rotation process, the rock slag enters the end of the slag removal blade 103, and as the slag removal blade 103 rotates, the rock slag slides down and is discharged from the through hole in the middle of the connecting ring 114, and falls into the arc-shaped slag receiving chute 7, and the rock slag is discharged out of the hole by a trolley or a conveyor belt.

[0048] The preferred solution is Figure 2 In the embodiment, the sliding support 106 and the driving seat 107 are connected by a spline, and optionally a sliding key connection can be used, so that the driving seat 107 can drive the sliding support 106 to rotate without affecting the axial sliding of the sliding support 106; An inner gear ring 108 is provided on the inner wall of the driving seat 107, and a revolution driving device 109 is fixedly provided on the inner wall of the fixed ring seat 112. The output shaft of the revolution driving device 109 is provided with a revolution driving gear 116, and the revolution driving gear 116 is meshed and connected with the inner gear ring 108 to drive the driving seat 107 to rotate; preferably, the revolution driving device 109 adopts a hydraulic motor, and the revolution driving device 109 is located on the fixed ring seat 112. A push-pull slip ring 110 is provided on the end face of the sliding support 106 away from the drill bit 101, and a telescopic cylinder 111 is fixedly provided on the inner wall of the fixed ring seat 112. The piston rod of the telescopic cylinder 111 is connected to a push-pull head 115. The push-pull head 115 is located in the push-pull slip ring 110 and is slidably connected to the push-pull slip ring 110.

[0049] The preferred solution is Figure 2 In the embodiment, the push-pull slip ring 110 is a circular ring structure, and a groove with a circular arc cross section is provided on the push-pull slip ring 110, the opening of the circular arc groove faces the telescopic oil cylinder 111, and the width of the opening is smaller than the diameter of the circular arc groove; The free end of the push-pull head 115 is provided with a ball head, which is located in the arc-shaped groove, and the diameter of the ball head is smaller than the width of the opening of the arc-shaped groove. Through the extension and contraction of the telescopic oil cylinder 111, the push-pull head 115 is used to push the sliding support 106 to slide back and forth.

[0050] In a preferred embodiment, the outer wall of the fixed ring seat 112 is provided with a stepped structure; A guide sleeve is provided between the head end of the fixed ring seat 112 and the sliding support 106, and a sealing ring is also provided between the head end of the fixed ring seat 112 and the sliding support 106; The tail end of the fixed ring seat 112 is connected to the jacking pipe section 6 through a step structure. This structure is suitable for shorter jacking pipe construction projects without the excavation correction device 10. For example, jacking pipe projects with a length of less than 100 meters.

[0051] The preferred solution is Figure 1 In the embodiment, a tunneling deviation correction device 10 is also provided between the fixed ring seat 112 and the top pipe section 6. The fixed ring seat 112 is fixedly connected to the tunneling deviation correction device 10, and the tunneling deviation correction device 10 is sleeved with the top pipe section 6 through a step.

[0052] The preferred solution is Figure 2 In the embodiment, the drill driving device 102 is provided with a hydraulic motor, which is connected to the drill bit 101, and the hydraulic station in the multimedia supply pipeline 2 is connected to the hydraulic motor of the drill driving device 102; preferably, the hydraulic motor is connected to the drill bit 101 through a transmission mechanism, and the output shaft of the hydraulic motor is not coaxial with the shaft of the drill bit 101 to obtain a better installation space. Preferably, the edge of the drill bit 101 is substantially flush with the outer edge of the fixing ring seat 112.

[0053] like Figure 4 , 5 In the embodiment, a multimedia rotary joint 202 is provided on the multimedia supply pipeline 2, and the multimedia rotary joint 202 is arranged at the position of the rotation axis of the sliding support 106, so as to supply hydraulic oil to the hydraulic motor, fuel and auxiliary gas to the flame nozzle 104, and cooling water to the water channel 113 through the multimedia supply pipeline 2. Since the entire sliding support 106 is in a state of revolution, the drill driving device 102 and the flame nozzle 104 are also in a state of revolution, so it is necessary to use the multimedia rotary joint 202 to transmit the medium. Since the revolution speed is lower than 50 revolutions / min, preferably 10 revolutions / min, the follow-up rotation speed of the multimedia rotary joint 202 can meet the revolution requirements.

[0054] The preferred solution is shown in the figure Figure 4 , 5 In the multi-media rotary joint 202, the first rotary joint 203, the second rotary joint 204, the third rotary joint 205 and the fourth rotary joint 206 are coaxially sleeved from outside to inside, the annular cavity between the walls of each rotary joint constitutes a channel for medium circulation, the wall of each rotary joint is provided with a relatively rotating and sealed structure, the pipelines of the rotary joints located at the periphery are led out from the side wall, and the pipelines of the rotary joints located in the middle are directly led out. Figure 4 In the embodiment, each rotary joint 205 is composed of two parts that are sleeved together, a sealing structure is provided between the two parts, and an axial locking structure is also provided, for example, an annular groove is provided on the outer wall of one part, and a sliding pin is provided on the other part, and the sliding pin is located in the annular groove. A sliding pad 209 is also provided between each rotary joint to maintain the gap between each rotary joint.

[0055] The preferred solution is Figure 1In the invention, a multifunctional anchor drill 4 is also provided, and the multifunctional anchor drill 4 is used to drill a fracturing hole 303 on the core 301; the multifunctional anchor drill 4 is also used to send the core fracturing device 9 into the fracturing hole 303; The core fracturing device 9 is connected to the fracturing pump 5 .

[0056] The preferred solution is Figure 6 In the core fracturing device 9, an inner wedge block 902 is provided between a plurality of outer wedge blocks 901, and the inclined surfaces between the outer wedge blocks 901 and the inner wedge blocks 902 fit each other; Initially, the common circumscribed circle diameter of the plurality of outer wedge blocks 901 is smaller than the inner diameter of the fracturing hole 303, and the inner wedge block 902 moves axially so that the common circumscribed circle diameter of the plurality of outer wedge blocks 901 is larger than the inner diameter of the fracturing hole 303; The inner wedge block 902 is fixedly connected to the pull rod 903 , and the pull rod 903 is fixedly connected to the fracturing hydraulic cylinder 906 to drive the inner wedge block 902 to move axially.

[0057] The preferred solution is Figure 6 In the middle, a cushion seat 904 is also provided, and the cushion seat 904 is fixedly connected to the fracturing hydraulic cylinder 906. A limiting through hole 905 is provided on the cushion seat 904, and the pull rod 903 passes through the limiting through hole 905 and is connected to the fracturing hydraulic cylinder 906.

[0058] The preferred solution is Figure 6 In the embodiment, the diameter of the limiting through hole 905 is smaller than the inner diameter of the fracturing hole 303 to prevent the outer wedge 901 from coming out. With this structure, when the core fracturing device 9 is placed in the fracturing hole 303, the pull rod 903 pulls out the inner wedge 902, and the inclined surface between the outer wedge 901 and the inner wedge 902 cooperates to expand the outer wedge 901 outward. When the diameter of the circumscribed circle after expansion is larger than the inner diameter of the fracturing hole 303, the fracturing hole 303 is fractured, and the core 301 falls into the slag chute 7 after being crushed, and the slag is discharged out of the hole. According to the test, in this project, the tensile strength of the core crushed stone is 15~25MPa, which is much lower than the compressive strength of the core crushed stone of 117MPa.

[0059] In a preferred solution, in the drill driving device 102, the output shaft of the hydraulic motor is connected to the shaft of the drill 101 through a transmission mechanism, and the axis of the drill 101 is not coaxial with the output shaft of the hydraulic motor; Alternatively, the hydraulic motor is partially embedded in the side wall of the sliding support 106, and the output shaft of the hydraulic motor is connected to the shaft of the drill bit 101 directly or through a reducer.

[0060] Embodiment 2: A construction method using the above-mentioned hot and cold alternating hard rock pipe jacking construction equipment comprises the following steps: S1, using the side limit excavation device 1 to excavate at the front end of the top pipe to form an annular groove 302; During the excavation process, the drill bit 101 rotates, and the sliding support 106 drives the drill bit 101 to revolve; The flame nozzle 104 sprays gas to heat the tunnel face of the surrounding rock 3 corresponding to the annular groove 302 to above 100° C. In a preferred embodiment, the heating temperature of the flame nozzle 104 is 150-400° C.; Water is sprayed from the drill bit 101 to cool the heated position, and the surrounding rock 3 is broken by alternating hot and cold to improve the drilling efficiency; S2. Drive the sliding support 106 to feed with the telescopic cylinder 111. After the excavation reaches the preset footage, stop the excavation and drill multiple fracturing holes 303 on the core 301 formed in the middle of the annular groove 302. Preferably, the diameter of the fracturing holes 303 is 2-5 cm, and the holes are cleaned; preferably, the spacing between the fracturing holes 303 is less than 10 cm.

[0061] S3, inserting multiple core fracturing devices 9 into the fracturing hole 303, inputting hydraulic oil into the fracturing hydraulic cylinder 906, so that the common circumscribed circle diameter of the multiple outer wedge blocks 901 increases until the core 301 is cracked; the radial pressure output by the multiple outer wedge blocks 901 is greater than 25 MPa; S4, cleaning the crushed rocks, and jacking the pipe section 6 to a preset depth; S5, repeat steps S1 to S4; The above steps can realize the rapid construction of hard rock pipe jacking.

[0062] like Figure 3 In the embodiment, the flame nozzle 104 is located downstream of the drill bit 101 and close to the upstream drill bit 101; with this structure, the heated rock has sufficient cooling time.

[0063] The revolution speed of the drill bit 101 is lower than 50 rpm; The single excavation footage of the annular groove 302 is 30~120cm; Preferably, Figure 4 In the embodiment, the media supplied from the outside to the inside of the multi-media rotary joint 202 are: oxygen or air, water, fuel and hydraulic oil; Preferred as Figure 1 In the embodiment, an excavation deviation correction device 10 is provided between the side limit excavation device 1 and the jacking pipe section 6, and a plurality of jacking cylinders distributed along the circumference are provided in the excavation deviation correction device 10 to realize the overall feeding and deviation correction operation of the side limit excavation device 1.

[0064] The above-mentioned embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A hot and cold alternating hard rock pipe jacking construction equipment, characterized by: It comprises a side limit excavation device (1), which is used to be arranged at the front end of the top pipe and drilled to form an annular groove (302); The structure of the side-limited tunneling device (1) comprises: a fixed ring seat (112), a driving seat (107), a sliding support (106) and a drill driving device (102); The fixed ring seat (112) is an annular cylindrical structure, and the fixed ring seat (112) is located at the front end of the top pipe; The driving seat (107) is an annular cylindrical structure. The driving seat (107) is located inside the fixed ring seat (112) and is connected to the fixed ring seat (112) so as to be relatively rotatable. A revolution driving device (109) is also provided to drive the driving seat (107) to rotate. The sliding support (106) is an annular cylindrical structure. The sliding support (106) is located in the driving seat (107) and is driven to rotate by the driving seat (107). At the same time, the sliding support (106) is driven by the telescopic oil cylinder (111) to reciprocate along the axial direction. A drill driving device (102) is provided near the edge of the sliding support (106). The drill driving device (102) is used to connect with the drill bit (101). The working surface of the drill bit (101) faces the tunnel face. The diameter of the drill bit (101) is the same as the groove width of the annular groove (302).

2. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 1 is characterized by: A flame nozzle (104) is provided on the sliding support (106), and the flame nozzle (104) faces the direction of the annular groove (302); A water channel (113) is provided on the drill bit (101); The flame nozzle (104) and the water channel (113) are connected to the multimedia supply pipeline (2) and are used to input fuel and water to alternately heat or cool the surrounding rock (3).

3. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 2 is characterized by: The flame nozzle (104) is located between the drill driving devices (102) on the circumference.

4. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 2 or 3, characterized in that: The fuel of the flame nozzle (104) includes butane, acetylene, natural gas, liquefied petroleum gas or hydrogen; The flame nozzle (104) is used to heat the surrounding rock in the annular groove (302) to 100-650°C.

5. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 4 is characterized by: The flame nozzle (104) is also used to input air or oxygen to improve combustion efficiency.

6. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 4 is characterized by: A heat insulating cover (105) is provided at a position of the sliding support (106) located inside the drill bit (101). The heat insulating cover (105) is a cylindrical structure. A heat insulating layer is provided on the inner wall of the heat insulating cover (105). The heat insulating cover (105) is used to block the heat generated by the fuel.

7. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 1 is characterized by: A slag removal blade (103) is provided on the end surface of the sliding support (106); one end of the slag removal blade (103) is fixedly connected to the sliding support (106), and the other end is a free end, which extends in the direction of the drill bit (101) and is located in the annular groove (302). The slag is discharged through the slag removal blade (103) by rotation.

8. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 7, characterized in that: A connecting ring (114) is provided in the middle of the sliding support (106), and an opening is provided on the connecting ring (114). The diameter of the opening is greater than or equal to the diameter of the rock core (301), and a slag receiving chute (7) is provided at the position of the opening. The slag receiving chute (7) is used to discharge the rock slag falling from the slag removal blade (103).

9. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 1, characterized in that: The sliding support (106) and the driving seat (107) are connected by a spline, so that the driving seat (107) can drive the sliding support (106) to rotate without affecting the axial sliding of the sliding support (106); An inner gear ring (108) is provided on the inner wall of the driving seat (107), a revolution driving device (109) is fixedly provided on the inner wall of the fixed ring seat (112), an output shaft of the revolution driving device (109) is provided with a revolution driving gear (116), and the revolution driving gear (116) is meshedly connected with the inner gear ring (108) to drive the driving seat (107) to rotate; A push-pull slip ring (110) is provided on the end surface of the sliding support (106), a telescopic oil cylinder (111) is fixedly provided on the inner wall of the fixed ring seat (112), a piston rod of the telescopic oil cylinder (111) is connected to a push-pull head (115), and the push-pull head (115) is located in the push-pull slip ring (110) and is slidably connected to the push-pull slip ring (110).

10. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 9, characterized in that: The push-pull slip ring (110) is a circular ring structure, and a groove with a circular arc cross section is provided on the push-pull slip ring (110), the opening of the circular arc groove faces the telescopic oil cylinder (111), and the width of the opening is smaller than the diameter of the circular arc groove; A ball head is provided at the free end of the push-pull head (115), the ball head is located in the arc-shaped groove, and the diameter of the ball head is smaller than the width of the opening of the arc-shaped groove.

11. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 10, characterized in that: The outer wall of the fixed ring seat (112) is provided with a stepped structure; A guide sleeve is provided between the head end of the fixed ring seat (112) and the sliding support (106), and a sealing ring is also provided between the head end of the fixed ring seat (112) and the sliding support (106); The rear end of the fixed ring seat (112) is sleeve-connected with the top pipe section (6) via a step structure.

12. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 11, characterized in that: A tunneling deviation correction device (10) is also provided between the fixed ring seat (112) and the top pipe section (6).

13. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 2, characterized in that: The drill bit driving device (102) is provided with a hydraulic motor, and the multimedia supply pipeline (2) is also connected to the hydraulic motor of the drill bit driving device (102); A multi-medium rotary joint (202) is provided on the multi-medium supply pipeline (2). The multi-medium rotary joint (202) is arranged at the position of the rotation axis of the sliding support (106) so as to supply hydraulic oil to the hydraulic motor, fuel and auxiliary gas to the flame nozzle (104), and cooling water to the water channel (113) through the multi-medium supply pipeline (2).

14. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 13, characterized in that: In the multi-medium rotary joint (202), the first rotary joint (203), the second rotary joint (204), the third rotary joint (205) and the fourth rotary joint (206) are coaxially sleeved from outside to inside, the annular cavity between the walls of each rotary joint constitutes a channel for medium circulation, the wall of each rotary joint is provided with a relatively rotating and sealed structure, the pipelines of the rotary joints located on the periphery are led out from the side wall, and the pipelines of the rotary joints located in the middle are directly led out.

15. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 14, characterized in that: There is also A multifunctional anchor drilling machine (4), the multifunctional anchor drilling machine (4) is used to drill a fracturing hole (303) on a rock core (301); the multifunctional anchor drilling machine (4) is also used to send a rock core fracturing device (9) into the fracturing hole (303); The fracturing hydraulic cylinder (906) of the core fracturing device (9) is connected to the output port of the fracturing pump (5).

16. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 15, characterized in that: In the core fracturing device (9), an inner wedge block (902) is provided between the plurality of outer wedge blocks (901), and the inclined surfaces between the outer wedge blocks (901) and the inner wedge blocks (902) fit each other; Initially, the common circumscribed circle diameter of the plurality of outer wedge blocks (901) is smaller than the inner diameter of the fracturing hole (303), and the inner wedge block (902) moves axially so that the common circumscribed circle diameter of the plurality of outer wedge blocks (901) is larger than the inner diameter of the fracturing hole (303); The inner wedge block (902) is fixedly connected to the pull rod (903), and the pull rod (903) is fixedly connected to the fracturing hydraulic cylinder (906) to drive the inner wedge block (902) to move axially.

17. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 16, characterized in that: A cushion seat (904) is also provided, the cushion seat (904) is fixedly connected to the fracturing hydraulic cylinder (906), a limiting through hole (905) is provided on the cushion seat (904), and the pull rod (903) passes through the limiting through hole (905) to be connected to the fracturing hydraulic cylinder (906).

18. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 17, characterized in that: The diameter of the limiting through hole (905) is smaller than the inner diameter of the fracturing hole (303) so as to prevent the outer wedge block (901) from falling out.

19. The hot and cold alternating hard rock pipe jacking construction equipment according to claim 2, characterized in that: In the drill driving device (102), the output shaft of the hydraulic motor is connected to the shaft of the drill bit (101) through a transmission mechanism, and the axis of the drill bit (101) is not coaxial with the output shaft of the hydraulic motor; Alternatively, the hydraulic motor is partially embedded in the side wall of the sliding support (106), and the output shaft of the hydraulic motor is connected to the shaft of the drill bit (101) directly or through a reducer.

20. A construction method using the hot and cold alternating hard rock pipe jacking construction equipment according to any one of claims 1 to 19, characterized in that it comprises the following steps: S1, using a side limit excavation device (1) to excavate at the front end of the top pipe to form an annular groove (302); During the excavation process, the drill bit (101) rotates, and the sliding support (106) drives the drill bit (101) to revolve; The flame nozzle (104) sprays gas to heat the face of the surrounding rock (3) corresponding to the annular groove (302) to above 100° C., and water is sprayed from the drill bit (101) to cool the heated position. The surrounding rock (3) is broken by alternating hot and cold, thereby improving drilling efficiency. S2, driving the sliding support (106) to advance by using the telescopic oil cylinder (111), and stopping the excavation after reaching a preset advance, drilling a plurality of fracturing holes (303) on the rock core (301) formed in the middle of the annular groove (302), and cleaning the holes; S3, inserting a plurality of core fracturing devices (9) into the fracturing hole (303), inputting hydraulic oil into the fracturing hydraulic cylinder (906), so as to increase the diameter of the common circumscribed circle of the plurality of outer wedge blocks (901), until the core (301) is cracked; S4, cleaning the crushed rocks after fracturing, and pushing the pipe section (6) forward to a preset depth; S5, repeat steps S1 to S4; The above steps can realize the rapid construction of hard rock pipe jacking.

21. A construction method according to claim 20, characterized in that: The radial pressure output by the plurality of outer wedge blocks (901) is greater than 25 MPa; The flame nozzle (104) is located downstream of the drill bit (101) and close to the upstream drill bit (101); The heating temperature of the flame nozzle (104) is 150-400°C; The revolution speed of the drill bit (101) is lower than 50 revolutions per minute; The single excavation footage of the annular groove (302) is 30~120cm; The media supplied from the outside to the inside of the multi-media rotary joint (202) are: oxygen or air, water, fuel and hydraulic oil; An excavation deviation correction device (10) is provided between the side limit excavation device (1) and the jacking pipe section (6), and a plurality of jacking oil cylinders distributed along the circumference are provided in the excavation deviation correction device (10) to achieve overall feeding and deviation correction operations of the side limit excavation device (1).

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