Underground space inclined shaft rectangular pipe jacking machine and construction method thereof

Abstract

The underground space inclined shaft rectangular pipe jacking machine comprises a drum-type main machine, the projection of one side of the drum-type main machine is a parallelogram, the drum-type main machine comprises an inner shield body and an outer shield body which are detachably connected, and drum-type cutter heads which are independent of each other are arranged at the front end of the inner shield body and the front end of the outer shield body correspondingly; the pushing direction of the pushing system at the rear end of the outer shield body and the pushing direction of the rectangular pipe joint are both parallel to the axis of the outer shield body, a grouting pipe, a slag discharging pipe and a traction system are arranged at the rear end of the inner shield body, and in the launching and jacking process, the tunnel face of the inclined shaft excavated by all the drum-type cutter heads is parallel to the bottom face of a launching tunnel. According to the technical scheme provided by the invention, the problems that the starting space is large, and equipment is difficult to enter and exit are solved, the problems that in the prior art, a pipe jacking machine is difficult to retreat, and grouting and bottom sealing cannot be carried out in blind well construction are solved, and under-pressure retreating and grouting and bottom sealing can be carried out at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of inclined shaft pipe jacking construction, in particular to an inclined shaft rectangular pipe jacking machine for underground space and its construction method. Background Art

[0002] An inclined shaft for underground space is an inclined passage used to connect the ground and an underground structure or adjacent underground structures, and its general purpose is to build an inclined escalator between the concourse layer and the platform layer of a subway station. In the construction of underground space, there are various construction methods for underground space inclined shafts. Among them, the pipe jacking method is widely used in urban underground engineering due to its non-excavation construction advantages. The pipe jacking method constructs a tunnel by jacking precast pipe segments in a working shaft, and has the advantages of fast construction speed and little impact on the ground.

[0003] However, as Figure 9 shown, when constructing an underground space inclined shaft, the existing pipe jacking machine 100 needs to be arranged obliquely relative to the existing tunnel 200. Therefore, the existing pipe jacking machine 100 requires a relatively large starting space, and the internal space of the existing tunnel 200 cannot meet the starting layout of the existing pipe jacking machine 100. The existing pipe jacking machine 100 will occupy the peripheral space 300 of the existing tunnel 200 before starting, and it is necessary to use the freezing method or the mining method to excavate the peripheral space 300 to expand a starting chamber that meets the existing pipe jacking machine 100, and then the existing pipe jacking machine 100 can be started and arranged.

[0004] In addition, as Figure 10 shown, after the underground space inclined shaft is tunnelled in place, it is necessary to use concrete slurry to seal the face 400. The ideal sealing concrete slurry 500 should always cover the face 400, that is, the vertical section of the ideal sealing concrete slurry 500 is approximately rectangular, one side covers the face 400, and the other side is sealed under pressure by the existing pipe jacking machine 100. However, the actual situation is that the existing pipe jacking machine 100 cannot apply the above ideal sealing concrete slurry 500. That is, due to the action of gravity, the concrete slurry will naturally accumulate at the bottom of the slurry chamber, and the vertical section of the actual sealing concrete slurry 600 is triangular. The theoretical height 700 of the concrete slurry liquid level is much greater than the actual height 800 of the sealing concrete slurry liquid level. Therefore, it cannot meet the sealing requirements for the upper part of the face 400.

[0005] Although the utility model patent with the authorization announcement date of May 19, 2020 and the authorization announcement number of CN210564534 discloses a rectangular pipe jacking skew construction structure, which includes a pipe jacking boring machine and a pipe jacking shaft for placing the pipe jacking boring machine, not only the above-mentioned technical problems that cannot be solved still exist, but also the following problems exist in actual application: 1. Large occupation of starting space: The rectangular pipe jacking machine requires a large starting space, which may lead to a tight construction site space and affect the construction efficiency; 2. Difficulty in entering the existing tunnel: When the traditional rectangular pipe jacking machine enters the existing tunnel, it may face problems such as limited space and poor equipment adaptability, increasing the complexity and risk of construction; 3. Poor construction flexibility: The existing technical solutions are difficult to meet the construction requirements under different geological conditions at the same time, especially in the geological environment where soft soil and rock strata alternate, resulting in low construction efficiency and even possible construction failure.

[0006] In summary, there is an urgent need for a pipe jacking machine with a small occupation of starting and receiving space and capable of realizing ideal bottom sealing concrete slurry construction to improve the construction efficiency and quality of the inclined shaft in the underground space.

[0007] It should be particularly noted that the above technical information is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or an indication in any form that the above technical information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0008] In view of the deficiencies in the above background technology, the present invention proposes a rectangular pipe jacking machine for the inclined shaft in the underground space and its construction method. The technical problem to be solved is: how to reduce the occupation of the starting and receiving space and carry out ideal bottom sealing concrete slurry construction to improve the construction efficiency and quality of the inclined shaft in the underground space.

[0009] The technical solution of the present invention is as follows: A rectangular pipe jacking machine for the inclined shaft in the underground space and its construction method, including a drum-type main machine. The projection of one side of the drum-type main machine is a parallelogram and includes a detachable inner shield and an outer shield. Independent drum-type cutter heads are respectively arranged at the front ends of the inner shield and the outer shield. The jacking system at the rear end of the outer shield and the jacking direction of the rectangular pipe section are both parallel to the axis of the outer shield. A grouting pipe for grouting during jacking and exhausting during retraction, a slag discharge pipe for discharging slag during jacking and injecting bottom sealing concrete during retraction, and a traction system for pulling the inner shield during retraction are arranged at the rear end of the inner shield. During the starting and jacking processes, the inclined shaft face excavated by each drum-type cutter head is parallel to the bottom surface of the starting tunnel.

[0010] On the basis of the above technical solution, as an optimized technical solution of the rectangular pipe jacking machine for inclined shafts in underground space, the side projections of the jacking system, one side of the rectangular pipe segment itself, and the side projection of the overall structure after the jacking system, the rectangular pipe segment, and the outer shield are in contact in sequence are all parallelograms.

[0011] On the basis of the above technical solution, as an optimized technical solution of the rectangular pipe jacking machine for inclined shafts in underground space, the jacking system includes a top shoe, jacking cylinders, and a jacking iron connected in sequence. The jacking directions of several jacking cylinders between the top shoe and the jacking iron are all parallel to the axis of the outer shield.

[0012] On the basis of the above technical solution, as an optimized technical solution of the rectangular pipe jacking machine for inclined shafts in underground space, the shape of the rear end face of the outer shield is the same as that of the rear end face of the rectangular pipe segment and includes a first support surface, a second support surface, a third support surface, and a fourth support surface that are respectively adapted to the front end face of the rectangular pipe segment or the front end face of the jacking iron. The second support surface and the fourth support surface are parallel to the bottom surface of the launching tunnel, and the first support surface and the third support surface are perpendicular to the jacking direction.

[0013] On the basis of the above technical solution, as an optimized technical solution of the rectangular pipe jacking machine for inclined shafts in underground space, several cylinder support surfaces are provided at the rear end of the jacking iron and the front end of the top shoe, and each cylinder support surface is perpendicular to the jacking direction.

[0014] On the basis of the above technical solution, as an optimized technical solution of the rectangular pipe jacking machine for inclined shafts in underground space, the roller cutter head includes several roller cutting units.

[0015] On the basis of the above technical solution, as an optimized technical solution of the rectangular pipe jacking machine for inclined shafts in underground space, the roller cutting unit includes a built-in motor for driving the roller to rotate, and several hob cutters and / or picks are arranged on the outer surface of the roller.

[0016] A construction method for a rectangular pipe jacking machine for inclined shafts in underground space uses the rectangular pipe jacking machine for inclined shafts in underground space described in any of the above technical solutions for blind shaft construction and inner shield retraction construction.

[0017] On the basis of the above technical solution, as an optimized technical solution of the construction method of the rectangular pipe jacking machine for inclined shafts in underground space, during blind shaft construction, when the jacking system is installed at the top of the launching tunnel and the roller-type main machine is jacked to excavate the installation space for the rectangular pipe segment, the jacking system retracts. The rectangular pipe segment is lowered at the rear end of the roller-type main machine, and then the jacking system jacks the roller-type main machine through the rectangular pipe segment to continue excavating a new installation space for the rectangular pipe segment. Subsequently, a new rectangular pipe segment is installed, and so on in a cycle until the roller cutter head excavates to the bottom of the inclined shaft.

[0018] On the basis of the above technical scheme, as the preferred technical scheme for the construction method of the rectangular pipe jacking machine in the underground inclined shaft, the grouting bottom sealing construction is carried out while the inner shield is retreating, the connection structure between the inner shield and the outer shield is removed, the bottom sealing concrete is injected into the inclined shaft heading through the slag discharge pipe, and the air in the inclined shaft heading is discharged through the grouting pipe. At the same time, under the action of the heading pressure, the traction system is used to slowly retreat the inner shield along the outer shield. After the grouting bottom sealing construction is completed, the traction system is used to completely separate the inner shield from the outer shield until it retreats to the starting tunnel.

[0019] A construction method for an underground space inclined shaft rectangular pipe jacking machine. When a receiving tunnel that has been completed is present, the underground space inclined shaft rectangular pipe jacking machine described in any of the above technical solutions is used to perform through-construction, and a receiving sleeve for receiving a drum-type main machine is arranged in the receiving tunnel.

[0020] Compared with the prior art, the rectangular pipe jacking machine for the underground space inclined shaft and the construction method thereof proposed by the present invention not only reduce the occupation of the starting receiving space, but also enable the ideal bottom sealing concrete slurry to be applied, thereby improving the construction efficiency and quality of the underground space inclined shaft. That is, the technical solution provided by the present invention not only solves the problem of large starting space occupation and difficulty in getting equipment in and out, but also solves the problem of difficulty in retreating the pipe jacking machine and the inability to grout the bottom in the blind shaft construction in the prior art, especially after the excavation is in place, the side belt pressure retreat and the side grouting bottom can be achieved, which further improves the safety and quality of the construction and avoids the safety hazards caused by the inability to achieve grouting bottom sealing in the prior art.

[0021] The technical effects of the present invention are mainly reflected in the following aspects: First, the structural design is more compact, the starting and receiving space is small, and it can adapt to the oblique starting and receiving needs, solving the problem that the existing pipe jacking machine occupies a large space and needs to expand the starting tunnel. Secondly, during the construction of the blind shaft, the side belt pressure retreat and grouting bottom sealing can be achieved after the excavation is in place, which improves the construction efficiency and reduces the impact on the existing tunnel and the surrounding environment. Finally, through the double-layer shield and sealing design, the present invention can ensure high efficiency and stability during the construction process, especially under complex geological and pressure conditions, ensuring the smooth progress of the construction. The above technical effects effectively improve the safety and reliability of the construction, and provide an efficient and retractable solution for the pipe jacking construction of the inclined shaft of the subway station, which can be used to construct inclined shafts such as inclined escalators between the station hall and the platform level of the subway station. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the starting state of the rectangular pipe jacking machine for the inclined shaft in the underground space; Figure 2 It is a schematic diagram of the state when the rectangular pipe jacking machine for the inclined shaft in the underground space jacks to the target position; Figure 3 It is Figure 2 the left view of Figure 4 It is a state diagram of the grouting and bottom sealing construction; Figure 5 It is an initial state diagram of the inner shield continuing to retract after the grouting and bottom sealing construction is completed; Figure 6 It is the front view of the roller cutter head at the front ends of the inner shield and the outer shield; Figure 7 It is Figure 6 the enlarged view of the roller cutting unit in Figure 8 It is a schematic diagram of the state when the receiving sleeve receives the roller-type main machine; Figure 9 It is a schematic diagram of the state when the existing pipe jacking machine starts; Figure 10 It is a schematic diagram of the state when the existing pipe jacking machine is used for inclined shaft tunneling and then grouting for bottom sealing.

[0024] Explanation of the reference numerals in the attached drawings: Existing pipe jacking machine 100, existing tunnel 200, peripheral space 300; Face 400, ideal bottom-sealing concrete slurry 500, actual bottom-sealing concrete slurry 600, theoretical concrete slurry liquid level 700, actual bottom-sealing concrete slurry liquid level 800; Thrust system 1: Top shoe 101, thrust cylinder 102, cylinder support surface 1021, jacking iron 103; Roller-type main machine 2: Inner shield 201, outer shield 202, first support surface 2021, second support surface 2022, third support surface 2023, roller cutter head 203, sealing component 204, grouting pipe 205, slag discharge pipe 206; Roller cutting unit 2031: Roller 20311, pick 20312, hob 20313; Roller support 2032; Rectangular pipe segment 3; Traction system 4: Retraction cylinder 401, traction rope 402, pulley 403, winch 404; Bottom-sealing concrete 5; Inclined shaft face 6; Receiving sleeve 7; Starting tunnel 8; Receiving tunnel 9; Recycling structure 10; Permanent structure 11. Detailed implementation manners

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the core concept of the present invention and the following embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0026] These embodiments are provided in this application to make this application thorough and complete, and to fully convey the scope of this application to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions and values described in these embodiments should be construed as merely exemplary, rather than as limitations.

[0027] It should be noted that in the description of this application, unless otherwise specified, the meaning of "a plurality of" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", etc. indicate the orientation or positional relationship only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of this application. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0028] In addition, the "first", "second" and similar terms used in this application do not denote any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. The terms "comprising" or "including" and the like mean that the elements before this term cover the elements listed after this term, and do not exclude the possibility of also covering other elements.

[0029] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0030] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] A rectangular pipe jacking machine for an underground inclined shaft, such as Figures 1 to 3 As shown, it includes a drum-type main machine 2, one side of which is projected as a parallelogram and includes a detachably connected inner shield 201 and an outer shield 202. That is, one side of the drum-type main machine 2 is projected as a parallelogram, and the other side is projected as a rectangle, and the acute angle of the parallelogram is the angle between the axis of the inclined shaft to be excavated and the axis of the starting tunnel 8. The inner shield 201 and the outer shield 202 are preferably connected by bolts, so as to facilitate assembly and disassembly, and a sealing component 204 is provided between the inner shield 201 and the outer shield 202, such as a water-stopping rubber pad, a water-expandable pad, and a composite structure thereof.

[0033] like Figure 6 As shown, the front ends of the inner shield body 201 and the outer shield body 202 are respectively provided with independent drum cutter discs 203. The drum cutter disc 203 at the front end of the inner shield body 201 and the drum cutter disc 203 at the front end of the outer shield body 202 are independent of each other. The drum cutter disc 203 at the front end of the inner shield body 201 is rectangular as a whole, while the drum cutter disc 203 at the front end of the outer shield body 202 is ring-shaped as a whole. The two together constitute a full-section rectangular full-section cutting and rolling excavation structure.

[0034] like Figure 2 and Figure 3As shown in the figure, the jacking system 1 at the rear end of the outer shield 202 and the jacking direction of the rectangular pipe jacking segment 3 are both parallel to the axis of the outer shield 202, ensuring that during the starting and jacking processes, the inclined shaft face 6 excavated by each roller cutter head 203 is parallel to the bottom surface of the starting tunnel 8. It should be noted that in this embodiment, the rectangular pipe jacking segment 3 refers to the one with a rectangular cross-section for supporting the inclined shaft with a rectangular cross-section, and its side view is still a parallelogram. At the same time, the parallelogram appearing in the present invention means that the overall shape is approximately a parallelogram, and the overall contour includes two parallel sides on the left and right and two parallel sides on the top and bottom. However, broken lines are allowed at the transitions of adjacent sides and at the local details of the same side. Therefore, it is not completely the same as the parallelogram defined in mathematical geometry.

[0035] As Figure 3 shown in the figure, at the rear end of the inner shield 201, there are a grouting pipe 205 for grouting during jacking and exhausting during retraction, a slag discharge pipe 206 for discharging slag during jacking and pouring bottom sealing concrete 5 during retraction, and a traction system 4 for pulling the inner shield 201 during retraction.

[0036] On the basis of the above embodiments, as a preferred embodiment of the rectangular pipe jacking machine for underground space inclined shafts, as Figures 1 to 4 shown in the figure, the side projection of the jacking system 1, one side of the rectangular pipe jacking segment 3 itself, and the side projection of the overall structure after the jacking system 1, the rectangular pipe jacking segment 3, and the outer shield 202 are in contact in sequence are all parallelograms.

[0037] On the basis of the above embodiments, as a preferred embodiment of the rectangular pipe jacking machine for underground space inclined shafts, the jacking system 1 includes a top shoe 101, jacking cylinders 102, and a jacking iron 103 connected in sequence. The jacking directions of several jacking cylinders 102 between the top shoe 101 and the jacking iron 103 are all parallel to the axis of the outer shield 202. The top shoe 101 is used to connect to the top of the starting tunnel 8, and each jacking cylinder 102 is arranged in a stepped manner to synchronously jack the jacking iron 103 or synchronously retract the jacking iron 103.

[0038] On the basis of the above embodiments, as a preferred embodiment of the rectangular pipe jacking machine for underground space inclined shafts, as Figure 1 shown in the figure, the shape of the rear end face of the outer shield 202 is the same as that of the rear end face of the rectangular pipe jacking segment 3 and includes a first support surface 2021, a second support surface 2022, a third support surface 2023, and a fourth support surface that are respectively adapted to the front end face of the rectangular pipe jacking segment 3 or the front end face of the jacking iron 103. The second support surface and the fourth support surface are parallel to the bottom surface of the starting tunnel 8, and the first support surface 2021 and the third support surface 2023 are perpendicular to the jacking direction.

[0039] That is, the first support surface 2021, the second support surface 2022, the third support surface 2023, and the fourth support surface are respectively the rear end faces of the outer shield 202 at the front, rear, left, and right directions. Among them, the first support surface 2021 and the third support surface 2023 are spaced apart from each other and parallel to each other, and the second support surface and the fourth support surface are spaced apart from each other and parallel to each other. Correspondingly, matching support surfaces are provided on the rectangular pipe segment 3 and the jacking iron 103 to make the jacking force transmission more stable and reliable.

[0040] On the basis of the above embodiments, as a preferred embodiment of the rectangular pipe jacking machine for the inclined shaft in the underground space, a plurality of oil cylinder support surfaces 1021 are provided at the rear end of the jacking iron 103 and the front end of the top support shoes 101 at the top, and each oil cylinder support surface 1021 is perpendicular to the jacking direction.

[0041] On the basis of the above embodiments, as a preferred embodiment of the rectangular pipe jacking machine for the inclined shaft in the underground space, the drum cutter head 203 includes a plurality of drum cutting units 2031, that is, the drum cutter head 203 at the front end of the inner shield 201 and the drum cutter head 203 at the front end of the outer shield 202 both include a plurality of independent drum cutting units 2031.

[0042] On the basis of the above embodiments, as a preferred embodiment of the rectangular pipe jacking machine for the inclined shaft in the underground space, the drum cutting unit 2031 includes a built-in motor for driving the rotation of the drum 20311, and a plurality of hob cutters 20313 and / or picks 20312 are provided on the outer surface of the drum 20311. Preferably, the hob cutters 20313 or picks 20312 on the drum 20311 are spirally spaced.

[0043] As a preferred embodiment of the construction method of the rectangular pipe jacking machine for the inclined shaft in the underground space, the rectangular pipe jacking machine for the inclined shaft in the underground space described in any of the above embodiments is used for blind shaft construction and the retraction construction of the inner shield 201.

[0044] On the basis of the above embodiments, as a preferred embodiment of the construction method of the rectangular pipe jacking machine for the inclined shaft in the underground space, as Figures 1 to 3 shown, during blind shaft construction, when the jacking system 1 installed at the top of the starting tunnel 8 jacks the drum-type main machine 2 to excavate the installation space of the rectangular pipe segment 3, the jacking system 1 retracts, and the rectangular pipe segment 3 is lowered at the rear end of the drum-type main machine 2. Subsequently, the jacking system 1 jacks the drum-type main machine 2 through the rectangular pipe segment 3 to continue to excavate a new installation space for the rectangular pipe segment 3, and then a new rectangular pipe segment is installed, and so on in a cycle until the drum cutter head 203 excavates to the bottom of the inclined shaft.

[0045] On the basis of the above embodiments, as a preferred embodiment of the construction method of the rectangular pipe jacking machine for the inclined shaft in the underground space, as Figures 4 to 7As shown in the figure, while the inner shield 201 is retracted, grouting and bottom sealing construction are carried out. The connection structure between the inner shield 201 and the outer shield 202 is removed. Bottom sealing concrete 5 is injected into the inclined shaft face 6 through the slag discharge pipe 206, and the air in the inclined shaft face 6 is discharged through the grouting pipe 205. At the same time, under the action of maintaining the face pressure, the inner shield 201 is slowly retracted along the outer shield 202 by using the traction system 4. After the grouting and bottom sealing construction is completed, the inner shield 201 is completely separated from the outer shield 202 by using the traction system 4 until it is retracted to the launching tunnel 8.

[0046] As a preferred embodiment of the construction method of the rectangular pipe jacking machine for inclined shafts in underground spaces, as Figure 8 shown, when there is an existing receiving tunnel 21 that has been constructed, the rectangular pipe jacking machine for inclined shafts in underground spaces described in any of the above embodiments is used for penetration construction, and a receiving sleeve 7 for receiving the drum-type main machine 2 is arranged in the receiving tunnel 21.

[0047] As a preferred embodiment of the construction method of the rectangular pipe jacking machine for inclined shafts in underground spaces, as Figures 1 to 7 shown, the rectangular pipe jacking machine for inclined shafts in underground spaces consists of a jacking system 1, a drum-type main machine 2, and a rear support system, etc. In this embodiment, taking the construction of a blind shaft as an example, there is no receiving space at the lower end of the inclined shaft.

[0048] The jacking system 1 consists of a top shoe 101, jacking cylinders 102, and jacking irons 103, and is fixed at the position of the inclined shaft excavated from the existing tunnel. The thrust provided by the jacking cylinders 102 acts on the jacking iron 103, and the jacking iron 103 pushes the main machine 4 to advance forward.

[0049] The drum-type main machine 4 includes an inner shield 201 and an outer shield 202. A plurality of sealing components 204 are arranged between the inner shield 201 and the outer shield 202 to maintain a pressure-sealed state at the bottom of the shaft during tunneling and retraction. The inner shield 201 and the outer shield 202 are detachably connected by bolts. The front ends of both the inner shield 201 and the outer shield 202 are equipped with drum-type cutter heads 203. A number of drum cutting units 2031 are arranged on the drum-type cutter head 203, and the drum cutting units 2031 are supported by drum supports 2032. Among them, a number of hob cutters 801 are evenly installed on each drum cutting unit 2031. At the same time, an internal motor 802 and a hydraulic pipe are arranged on each drum cutting unit 20318, which can automatically rotate to effectively cut the rock mass of the face. In addition, a grouting pipe 205 and a slag discharge pipe 206 are arranged at the rear end of the inner shield 201. During tunneling, grout 205 is injected to balance the face pressure, and the slag discharge pipe 206 discharges the soil cut by the cutter head.

[0050] Pipe jacking machine tunneling stage: First, one side of the top support shoe 101 is fixed to the top wall at the inclined shaft position of the starting tunnel 8 through a tunnel connection structure. On the other side, a jacking cylinder 102 and a jacking iron 103 are arranged. The jacking cylinder 102 and the jacking iron 103 can move along the inclined shaft driving direction to form an output end.

[0051] After the pipe jacking machine starts tunneling for one stroke, a rectangular pipe segment 3 is lowered at the rear end of the drum-type main machine 2. Subsequently, the jacking system 1 acts on the rectangular pipe segment 3 to push the drum-type main machine 2 to continue tunneling forward until the bottom of the inclined shaft. The outer shield 202 is connected to the rectangular pipe segment 3 and keeps stable contact with the outside soil layer during the jacking process, effectively reducing soil layer disturbance.

[0052] Retraction stage of the pipe jacking machine: When tunneling to the bottom of the inclined shaft, the equipment jacking ends. The connecting bolts between the inner shield 201 and the outer shield 202 are removed to separate the inner shield 201 and the outer shield 202. As Figure 5 and Figure 6 shown, the outer shield 202 and the rectangular segment 3 remain in the shaft as part of the permanent structure. Figure 6 The central rectangular frame in

[0053] is the recycling structure 10, and the surrounding annular frame is the permanent structure 11 buried underground. The drum cutter head 203 at the front end of the inner shield 201 is recycled together with the inner shield 201. When recycling the inner shield, first, a retraction cylinder 401 is installed on the wall surface of the rectangular segment 3. The bottom sealing concrete 5 is injected into the inclined shaft face 6 through the slag discharge pipe 206. The grouting pipe 12 is used for exhausting air from the inclined shaft face 6 at this stage. Under the action of maintaining the pressure of the inclined shaft face 6, the inner shield 201 slowly retracts upward by using the retraction cylinder 401. After the grouting and bottom sealing are completed, the retraction cylinder 401 is removed. Subsequently, a pulley 403 is installed on the jacking iron 103, and a winch 404 in the starting tunnel 8 is used to wind up the traction rope 402 passing through the pulley 403 and connected to the inner shield 201 to continue recycling the inner shield 201. The design of the retraction function realizes the function of grouting and bottom sealing while retracting under pressure, ensuring that even in a blind shaft or without a receiving condition, the pipe jacking can still be recycled by retracting the inner shield. The schematic diagram of the retraction steps of the pipe jacking machine is as follows.

[0054] As an alternative embodiment 1 of the present invention, when tunneling in soft soil strata, the hob 20313 on the drum cutting unit in the present invention can be replaced by picks 20312; when tunneling in complex geological conditions, the drum cutting unit can be evenly arranged with hobs 20313 and picks 20312. The present invention takes the rock stratum geological condition with the most severe application conditions as an example, and other various tools can also be installed under other inclined shaft tunneling working conditions.

[0055] As the second alternative embodiment of the present invention, when there is an existing receiving tunnel 9 or the platform layer of a subway station that has been constructed at the lower part of the inclined shaft receiving end, the receiving sleeve 7 can be directly arranged from the lower receiving tunnel 9 or the platform layer to ensure the pressure balance at the receiving end. After the drum-type main machine 2 has completed tunneling, it is disengaged from the rectangular segment 3 and enters the receiving sleeve, and then the receiving sleeve and the main machine are recovered from the lower part.

[0056] That is, the underground space inclined shaft rectangular pipe jacking machine and its construction method provided by the present invention are particularly suitable for excavating the inclined escalator space used to connect the concourse layer and the platform layer in a subway station, solving the problems that the existing pipe jacking machine 100 occupies a large starting space and requires excavation of the existing tunnel 200, and the problem that grouting and sealing the bottom cannot be carried out under pressure conditions after tunneling in place. The core inventive points include: a drum-type cutter head 203 for rectangular full-section cutting and rolling excavation, a jacking system 1 with a parallelogram projection on one side, a drum-type main machine 2, a rectangular pipe segment 3, a split inner shield 201, an outer shield 202 and the mutually independent drum cutting units 2031 arranged at their front ends, and pressure grouting and sealing the bottom when the inner shield 201 retracts.

[0057] The present invention aims to achieve a compact structure, adapt to complex geological conditions, and have a retraction function through innovative structural design and construction methods, effectively solving the problems in blind shaft construction, and improving the construction efficiency, construction quality and safety of excavating the inclined escalator space in a subway station.

[0058] The core components include a jacking system 1, a drum-type main machine 2 with an inner and outer double-layer shield structure, a traction system 4 and other systems. The drum-type main machine 1 adopts a drum-type cutter head 203, that is, a rectangular full-section cutting and rolling excavation device, and picks 20312 and hob cutters 20313 adapted to soft soil and rock stratum geological conditions are arranged on the drum 20311, and efficient excavation is achieved through the rotation of the drum 20311. The jacking system 1 includes a top shoe 101, a jacking oil cylinder 102 and a jacking iron 103. The thrust of the jacking oil cylinder 102 is transmitted to the drum-type main machine 2 through the jacking iron 103 to push it forward for tunneling. The shield is composed of an inner and outer double-layer structure. The outer shield 202 is connected to the rectangular pipe segment 3 and remains as a permanent structure in the well after jacking is completed. The inner shield 201 is separated from the outer shield 202 by a sealing component 204 to maintain the sealing state at the bottom of the well. Key components such as the drum 20311 in the retraction area are recovered together with the inner shield 201 to meet the retraction requirements. In addition, one side of the drum-type main machine 2 adopts a parallelogram design, effectively reducing the construction space requirements and adapting to inclined starting and receiving.

[0059] In the inclined shaft rectangular pipe jacking machine for underground space of the present invention, as described above, the problems in inclined shaft pipe jacking construction are mainly solved through the innovative rectangular full-section cutting and rolling excavation device and the detachable double-layer shield design. The rectangular full-section cutting device can achieve efficient excavation operations under complex geological conditions with alternating soft soil and rock strata by arranging cutters and hob cutters. The inner and outer double-layer structure of the shield design ensures the sealing and stability during the construction process. Especially during the retraction process, the sealing components between the inner and outer shields ensure the airtightness of the underground construction space and avoid the influence of water and soil pressure on tunneling. Compared with the prior art, through the design of the pressure-bearing retraction function, the pipe jacking machine of the present invention is more flexible in blind shaft construction, solves the problem that grouting and sealing the bottom cannot be carried out under pressure in the prior art, and improves the feasibility and safety of the overall construction.

[0060] The details not described in the present invention are all conventional technical means well known to those skilled in the art.

[0061] The above content shows and describes the basic principles, main features and beneficial effects of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An underground space inclined shaft rectangular pipe jacking machine, comprising a drum-type main machine, characterized in that: One side projection of the drum-type main engine is a parallelogram and includes a detachably connected inner shield and an outer shield. The front ends of the inner shield and the outer shield are respectively provided with independent drum-type cutter heads. The jacking system at the rear end of the outer shield and the jacking direction of the rectangular pipe section are parallel to the axis of the outer shield. The rear end of the inner shield is provided with a grouting pipe for grouting during jacking and for exhaust during retreat, a slag discharge pipe for slag discharge during jacking and for filling bottom sealing concrete during retreat, and a traction system for towing the inner shield during retreat. During the starting and jacking process, the inclined shaft heading face excavated by each drum-type cutter head is parallel to the bottom surface of the starting tunnel.

2. The rectangular pipe jacking machine for an underground inclined shaft according to claim 1, characterized in that: The projections of one side of the jacking system and the rectangular pipe section itself, and the projections of one side of the overall structure after the jacking system, the rectangular pipe section and the outer shield body are sequentially in contact, are all parallelograms.

3. The rectangular pipe jacking machine for an underground inclined shaft according to claim 1 or 2, characterized in that: The jacking system comprises a top support shoe, a jacking oil cylinder and a jacking iron which are connected in sequence, and the jacking directions of the plurality of jacking oil cylinders between the top support shoe and the jacking iron are parallel to the axis of the outer shield body.

4. The rectangular pipe jacking machine for an underground inclined shaft according to claim 3, characterized in that: The shape of the rear end face of the outer shield is the same as that of the rear end face of the rectangular pipe segment and includes a first supporting surface, a second supporting surface, a third supporting surface and a fourth supporting surface respectively adapted to the front end face of the rectangular pipe segment or the front end face of the top iron, the second supporting surface and the fourth supporting surface are parallel to the bottom surface of the starting tunnel, and the first supporting surface and the third supporting surface are perpendicular to the top pushing direction.

5. The rectangular pipe jacking machine for an underground inclined shaft according to claim 4, characterized in that: The rear end of the top iron and the front end of the top support shoe are both provided with a plurality of oil cylinder support surfaces, and each oil cylinder support surface is perpendicular to the pushing direction.

6. The rectangular pipe jacking machine for an inclined shaft in an underground space according to any one of claims 1, 2, 4 and 5, characterized in that: The drum cutter disc comprises a plurality of drum cutting units.

7. The rectangular pipe jacking machine for an underground inclined shaft according to claim 8, characterized in that: The drum cutting unit comprises a built-in motor for driving the drum to rotate, and a plurality of roller cutters and / or cutting teeth are arranged on the outer surface of the drum.

8. A construction method for a rectangular pipe jacking machine in an underground inclined shaft, characterized in that: The rectangular pipe jacking machine for the underground inclined shaft as described in any one of claims 1 to 7 is used for blind shaft construction and inner shield retreat construction.

9. The construction method of the rectangular pipe jacking machine for an underground inclined shaft according to claim 8, characterized in that: When carrying out blind shaft construction, after the jacking system is installed on the top of the starting tunnel to push the roller main machine in and out of the rectangular pipe segment installation space, the jacking system retracts and lowers the rectangular pipe segment at the rear end of the roller main machine. Then the jacking system pushes the roller main machine downward through the rectangular pipe segment to continue to excavate a new rectangular pipe segment installation space, and then installs a new rectangular pipe segment, and this cycle continues until the drum cutter head excavates to the bottom of the inclined shaft.

10. The construction method of the rectangular pipe jacking machine for an underground inclined shaft according to claim 8 or 9, characterized in that: While the inner shield is being withdrawn, grouting and bottom sealing construction is carried out. The connecting structure between the inner shield and the outer shield is removed, and bottom sealing concrete is injected into the inclined shaft heading through the slag discharge pipe. The air in the inclined shaft heading is discharged through the grouting pipe. At the same time, while maintaining the heading pressure, the traction system is used to slowly withdraw the inner shield along the outer shield. After the grouting and bottom sealing construction is completed, the traction system is used to completely separate the inner shield from the outer shield until it is withdrawn to the starting tunnel.

11. A construction method for a rectangular pipe jacking machine in an underground inclined shaft, characterized in that: When a completed receiving tunnel already exists, the underground space inclined shaft rectangular pipe jacking machine described in any one of claims 1 to 7 is used for penetration construction, and a receiving sleeve for receiving the drum-type main machine is arranged in the receiving tunnel.

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