An inclined shaft rectangular pipe jacking machine for underground space and its construction method

Abstract

The present invention discloses an inclined shaft rectangular pipe jacking machine for underground space and its construction method, which includes 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 segment are both parallel to the axis of the outer shield. A grouting pipe, a slag discharge pipe and a traction system 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. The technical solution provided by the present invention not only solves the problems of large occupied starting space and difficult equipment access and exit, but also solves the problems of difficult retraction of the pipe jacking machine in the prior art and inability to grout and seal the bottom in blind shaft construction, and can realize pressure-holding retraction and grouting and bottom sealing at the same time.

Description

Technical Field

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

[0002] An underground space inclined shaft is an inclined passage for connecting the ground with an underground structure or between adjacent underground structures, and is generally used for building 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 launching space, and the internal space of the existing tunnel 200 cannot meet the launching arrangement 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 launching, and it is necessary to use the freezing method or the mining method to excavate the peripheral space 300 to expand a launching chamber that meets the existing pipe jacking machine 100, and then the existing pipe jacking machine 100 can be launched and arranged.

[0004] In addition, as Figure 10 shown, after the underground space inclined shaft is excavated 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, with one side covering the face 400 and the other side being sealed under pressure by the existing pipe jacking machine 100. However, the actual situation is that the existing pipe jacking machine 100 cannot construct 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, the sealing requirement for the upper part of the face 400 cannot be met.

[0005] Although the utility model patent with the authorization announcement date of May 19, 2020 and the authorization announcement number of CN210564534U discloses a rectangular pipe jacking skew construction structure, including a pipe jacking boring machine and a pipe jacking shaft for placing the pipe jacking boring machine, not only the above-mentioned unsolvable technical problems 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 tense 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 layers 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 backfill concrete slurry construction, so as to improve the construction efficiency and construction quality of the underground space inclined shaft.

[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 any form of suggestion that the above technical information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0008] Aiming at the deficiencies in the above background technology, the present invention proposes an underground space inclined shaft rectangular pipe jacking machine and its construction method. The technical problem to be solved is: how to reduce the occupation of starting and receiving space and perform ideal backfill concrete slurry construction to improve the construction efficiency and construction quality of the underground space inclined shaft.

[0009] The technical solution of the present invention is:

[0010] An underground space inclined shaft rectangular pipe jacking machine and its construction method, including a drum-type main machine. The side projection of the drum-type main machine is a parallelogram and includes a detachable 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 segment are both 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 exhausting during retraction, a slag discharge pipe for discharging slag during jacking and injecting backfill concrete during retraction, and a traction system for pulling the inner shield during retraction. During the starting and jacking process, the inclined shaft face excavated by each drum-type cutter head is parallel to the bottom surface of the starting tunnel.

[0011] On the basis of the above technical solutions, as an optimized technical solution for the rectangular pipe jacking machine in the inclined shaft of underground space, the side projections of the jacking system, one side of the rectangular pipe segment itself, and the overall structure after the jacking system, rectangular pipe segment, and outer shield contact in sequence are all parallelograms.

[0012] On the basis of the above technical solutions, as an optimized technical solution for the rectangular pipe jacking machine in the inclined shaft of underground space, the jacking system includes a top shoe, jacking cylinders, and a jacking iron connected in sequence, and 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.

[0013] On the basis of the above technical solutions, as an optimized technical solution for the rectangular pipe jacking machine in the inclined shaft of 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 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 starting tunnel, and the first support surface and the third support surface are perpendicular to the jacking direction.

[0014] On the basis of the above technical solutions, as an optimized technical solution for the rectangular pipe jacking machine in the inclined shaft of underground space, several oil cylinder support surfaces are provided at the rear end of the jacking iron and the front end of the top shoe, and each oil cylinder support surface is perpendicular to the jacking direction.

[0015] On the basis of the above technical solutions, as an optimized technical solution for the rectangular pipe jacking machine in the inclined shaft of underground space, the roller cutter head includes several roller cutting units.

[0016] On the basis of the above technical solutions, as an optimized technical solution for the rectangular pipe jacking machine in the inclined shaft of underground space, the roller cutting unit includes an in-built motor for driving the roller to rotate, and several hob cutters and / or picks are arranged on the outer surface of the roller.

[0017] A construction method for a rectangular pipe jacking machine in the inclined shaft of underground space uses the rectangular pipe jacking machine in the inclined shaft of underground space described in any of the above technical solutions for blind shaft construction and inner shield retraction construction.

[0018] On the basis of the above technical solutions, as an optimized technical solution for the construction method of the rectangular pipe jacking machine in the inclined shaft of underground space, during blind shaft construction, after the jacking system is installed at the top of the starting 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.

[0019] On the basis of the above technical solutions, as an optimized technical solution for the construction method of the rectangular pipe jacking machine for inclined shafts in underground spaces, during the construction of the retraction of the inner shield, 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 face through the slag discharge pipe, and the air in the inclined shaft face is discharged through the grouting pipe. At the same time, under the action of maintaining the face pressure, the inner shield is slowly retracted along the outer shield by using the traction system. After the grouting and bottom sealing construction is completed, the inner shield is completely separated from the outer shield by using the traction system until it retracts to the starting tunnel.

[0020] A construction method for a rectangular pipe jacking machine for inclined shafts in underground spaces. When there is an existing receiving tunnel that has been constructed, the rectangular pipe jacking machine for inclined shafts in underground spaces described in any of the above technical solutions is used for penetration construction, and a receiving sleeve for receiving the drum-type main machine is arranged in the receiving tunnel.

[0021] Compared with the prior art, the rectangular pipe jacking machine for inclined shafts in underground spaces and its construction method proposed by the present invention not only reduce the occupation of the starting and receiving space, but also can perform ideal bottom sealing concrete slurry construction, thereby improving the construction efficiency and quality of inclined shafts in underground spaces. That is, the technical solution provided by the present invention not only solves the problems of large occupation of the starting space and difficulty in equipment entry and exit, but also solves the problems of difficult retraction of the pipe jacking machine and inability to grout and seal the bottom in blind shaft construction in the prior art. Especially after tunneling in place, it can realize pressure-holding retraction and grouting bottom sealing at the same time, further improving the construction safety and quality, and avoiding the safety hazards caused by the inability to realize grouting bottom sealing in the prior art.

[0022] The technical effects of the present invention are mainly reflected in the following aspects: First, the structural design is more compact, the occupation of the starting and receiving space is small, and it can meet the requirements of inclined starting and receiving, solving the problems of large space occupation of the existing pipe jacking machine and the need for excavation of the starting tunnel. Second, during the construction of the blind shaft, after tunneling in place, it can realize pressure-holding retraction and grouting bottom sealing at the same time, improving the construction efficiency and reducing 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 construction safety and reliability, providing an efficient and retractable solution for the pipe jacking construction of inclined shafts in subway stations, and can be used for constructing inclined shafts such as inclined escalators between the concourse and platform floors of subway stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of the starting state of the rectangular pipe jacking machine for the inclined shaft in the underground space;

[0025] Figure 2 Schematic diagram of the state when the rectangular pipe jacking machine for the inclined shaft in the underground space jacks to the target position;

[0026] Figure 3 It is Figure 2 left view;

[0027] Figure 4 State diagram of the grouting and bottom sealing construction;

[0028] Figure 5 Initial state diagram of the inner shield continuing to retract after the grouting and bottom sealing construction is completed;

[0029] Figure 6 Front view of the drum cutter head at the front ends of the inner shield and the outer shield;

[0030] Figure 7 It is Figure 6 enlarged view of the drum cutting unit in

[0031] Figure 8 Schematic diagram of the state when the receiving sleeve receives the drum-type main machine;

[0032] Figure 9 Schematic diagram of the state when the existing pipe jacking machine starts;

[0033] Figure 10 Schematic diagram of the state when grouting and bottom sealing are carried out after inclined shaft tunneling using the existing pipe jacking machine.

[0034] Explanation of the reference numerals in the attached drawings:

[0035] Existing pipe jacking machine 100, existing tunnel 200, peripheral space 300;

[0036] 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;

[0037] Thrust system 1: Top shoe 101, thrust cylinder 102, cylinder support surface 1021, jacking iron 103;

[0038] Drum-type main machine 2: Inner shield 201, outer shield 202, first support surface 2021, second support surface 2022, third support surface 2023, drum cutter head 203, sealing component 204, grouting pipe 205, slag discharge pipe 206;

[0039] Drum cutting unit 2031: drum 20311, pick 20312, hob 20313;

[0040] Drum support 2032;

[0041] Rectangular pipe section 3;

[0042] Traction system 4: retraction cylinder 401, traction rope 402, pulley 403, winch 404;

[0043] Bottom sealing concrete 5;

[0044] Inclined shaft face 6;

[0045] Receiving sleeve 7;

[0046] Launch tunnel 8;

[0047] Receiving tunnel 9;

[0048] Recycling structure 10;

[0049] Permanent structure 11. Detailed implementation

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 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.

[0051] These embodiments are provided in this application to make the application thorough and complete, and to fully convey the scope of the application to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values described in these embodiments should be construed as merely exemplary, rather than as limitations.

[0052] It should be noted that in the description of this application, unless otherwise specified, the meaning of "several" is greater than or equal to two; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", etc. is 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 therefore 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.

[0053] In addition, the "first", "second" and similar terms used in this application do not denote any order, quantity or importance, but are merely used to distinguish different parts. "Vertical" does not mean strictly vertical, but within the allowable error range. "Parallel" does not mean strictly parallel, but within the allowable error range. Words such as "include" or "comprise" mean that the elements before this word cover the elements listed after this word, and do not exclude the possibility of also covering other elements.

[0054] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "install", "connect", and "join" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. When it is described that a specific device is 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.

[0055] All terms used in this application have the same meanings as 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 a general dictionary, such as those, should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0056] Technologies, methods and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the specification.

[0057] An underground space inclined shaft rectangular pipe jacking machine, as Figures 1 to 3 shown, includes a drum-type main machine 2. The projection of one side of the drum-type main machine 2 is a parallelogram and includes a detachable inner shield 201 and an outer shield 202. That is, the projection of one side of the drum-type main machine 2 is a parallelogram, and the projection of the other side is a rectangle. The acute angle of the parallelogram is the included angle between the axis of the inclined shaft to be excavated and the axis of the launching tunnel 8. Preferably, the inner shield 201 and the outer shield 202 are connected by bolts, which is convenient for assembly and disassembly. And a sealing member 204 is provided between the inner shield 201 and the outer shield 202, such as a water-stop rubber pad, a water-swellable pad and their composite structures, etc.

[0058] As Figure 6As shown in the figure, the front ends of the inner shield 201 and the outer shield 202 are respectively provided with independent drum cutters 203. The drum cutter 203 at the front end of the inner shield 201 is independent of the drum cutter 203 at the front end of the outer shield 202. The drum cutter 203 at the front end of the inner shield 201 is integrally rectangular, while the drum cutter 203 at the front end of the outer shield 202 is integrally annular. The two together form a rectangular full-section cutting and rolling excavation structure for the full section.

[0059] As Figure 2 and Figure 3 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 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 drum cutter 203 is parallel to the bottom surface of the starting tunnel 8. It should be noted that in this embodiment, the rectangular pipe segment 3 refers to a pipe segment with a rectangular cross-section for supporting an inclined shaft with a rectangular cross-section, and its side view is still a parallelogram. At the same time, the parallelograms mentioned in the present invention refer to those whose overall shape is approximately 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 local details of the same side. Therefore, it is not exactly the same as the parallelogram defined in mathematical geometry.

[0060] 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.

[0061] 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 projections of the jacking system 1, one side of the rectangular pipe segment 3 itself, and the overall structure after the jacking system 1, the rectangular pipe segment 3, and the outer shield 202 are in contact in sequence are all parallelograms.

[0062] 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, a jacking cylinder 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. Each jacking cylinder 102 is arranged in a stepped manner to synchronously jack the jacking iron 103 or synchronously retract the jacking iron 103.

[0063] On the basis of the above embodiments, as a preferred embodiment of the rectangular pipe jacking machine for underground space inclined shafts, as Figure 1As shown, the rear end face of the outer shield 202 has the same shape as 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 launching tunnel 8, and the first support surface 2021 and the third support surface 2023 are perpendicular to the jacking direction.

[0064] 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 four directions of the front, rear, left, and right of the rear end of the outer shield 202. 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 jacking segment 3 and the jacking iron 103 to make the jacking force transmission more stable and reliable.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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 one of the above embodiments is used for blind shaft construction and the retraction construction of the inner shield 201.

[0069] 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 3As shown, during the blind shaft construction, after the jacking system 1 is installed on the top of the starting tunnel 8 to push the drum-type main machine 2 in and out of the installation space of the rectangular pipe segment 3, the jacking system 1 retracts and lowers the rectangular pipe segment 3 at the rear end of the drum-type main machine 2. Subsequently, the jacking system 1 pushes the drum-type main machine 2 downward through the rectangular pipe segment 3 to continue to excavate a new installation space of the rectangular pipe segment 3, and then installs a new rectangular pipe segment, and this cycle is repeated until the drum cutter head 203 is excavated to the bottom of the inclined shaft.

[0070] On the basis of the above-mentioned embodiment, as a preferred embodiment of the construction method of the rectangular pipe jacking machine in the underground inclined shaft, Figures 4 to 7 As shown, while the inner shield 201 is being retreated, grouting and bottom sealing construction is carried out, the connection structure between the inner shield 201 and the outer shield 202 is removed, and 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 the face pressure, the inner shield 201 is slowly retreated 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 retreats to the starting tunnel 8.

[0071] As a preferred embodiment of the construction method of the rectangular pipe jacking machine for the underground inclined shaft, Figure 8 As shown, when there is a completed receiving tunnel 21, the underground space inclined shaft rectangular pipe jacking machine described in any of the above embodiments is used to perform penetration construction, and a receiving sleeve 7 for receiving the drum-type main machine 2 is arranged in the receiving tunnel 21.

[0072] As a preferred embodiment of the construction method of the rectangular pipe jacking machine for the underground inclined shaft, Figures 1 to 7 As shown, the rectangular pipe jacking machine for the underground space inclined shaft is composed of a jacking system 1, a drum-type main machine 2 and a rear supporting system. This embodiment takes the blind shaft construction as an example, and there is no receiving space at the lower end of the inclined shaft.

[0073] The jacking system 1 is composed of a top support shoe 101, a jacking cylinder 102 and a jacking iron 103, and is fixed at the position of the existing tunnel excavation inclined shaft. The thrust provided by the jacking cylinder 102 acts on the jacking iron 103, and the jacking iron 103 pushes the drum-type main machine 2 to dig forward.

[0074] The drum main machine 2 includes an inner shield 201 and an outer shield 202. Multiple sealing components 204 are arranged between the inner shield 201 and the outer shield 202 to maintain the pressure-sealed state at the bottom of the well during the excavation and retreat process. The inner shield 201 and the outer shield 202 are detachably connected by bolts. The front ends of the inner shield 201 and the outer shield 202 are both equipped with a drum cutter head 203, and a plurality of drum cutting units 2031 are arranged on the drum cutter head 203. The drum cutting units 2031 are supported by a drum support 2032. Each drum cutting unit 2031 is evenly installed with a plurality of roller cutters 801. At the same time, each drum cutting unit 20318 is arranged with a built-in motor 802 and a hydraulic pipe, which can automatically rotate to effectively cut the rock mass at 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 excavation, the grouting pipe 205 injects mud to balance the pressure of the tunnel face, and the slag discharge pipe 206 discharges the soil cut by the cutter head.

[0075] Pipe jacking machine excavation stage:

[0076] First, one side of the top support shoe 101 is fixed to the top wall of the inclined shaft excavation position of the starting tunnel 8 through the tunnel connection structure, and the other side is arranged with a push cylinder 102 and a top iron 103. The push cylinder 102 and the top iron 103 can move along the inclined shaft excavation direction to form an output end.

[0077] After the pipe jacking machine excavates one stroke, the rectangular pipe section 3 is lowered at the rear end of the drum main machine 2, and then the jacking system 1 acts on the rectangular pipe section 3 to push the drum main machine 2 to continue to excavate forward to the bottom of the inclined shaft. The outer shield 202 is connected to the rectangular pipe section 3, and maintains stable contact with the external soil layer during the jacking process, effectively reducing soil disturbance.

[0078] Pipe jacking machine retreat stage:

[0079] When the excavation reaches the bottom of the inclined shaft, the equipment jacking is completed, and the connecting bolts between the inner shield body 201 and the outer shield body 202 are removed to separate the inner shield body 201 and the outer shield body 202. Figure 5 and Figure 6 As shown, the outer shield 202 and the rectangular pipe section 3 remain underground as part of the permanent structure. Figure 6 The central rectangular frame in the middle is the recycling structure 10, and the outer annular frame is the permanent structure 11 buried underground. The drum-type cutter head 203 at the front end of the inner shield body 201 is recycled together with the inner shield body 201.

[0080] When the inner shield is recovered, first install the retraction oil cylinder 401 on the wall of the rectangular pipe section 3. Inject the bottom-sealing concrete 5 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 oil cylinder 401. After the grouting and bottom-sealing are completed, remove the retraction oil cylinder 401. Subsequently, install the pulley 403 on the top iron 103, and use the winch 404 in the launching tunnel 8 to wind up the traction rope 402 that passes through the pulley 403 and is connected to the inner shield 201, and continue to recover 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 the case of a blind shaft or without a receiving condition, the pipe jacking can still be recovered by retracting the inner shield. The schematic diagram of the pipe jacking machine retraction steps is as follows.

[0081] 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 the pick 20312; when tunneling in complex geological conditions, the drum cutting unit can be evenly arranged with the hob 20313 and the pick 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.

[0082] As an alternative embodiment 2 of the present invention, when there is an already constructed receiving tunnel 9 or the platform layer of the subway station 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 finishes tunneling, it is separated from the rectangular pipe section 3 and enters the receiving sleeve, and then the receiving sleeve and the main machine are recovered from the lower part.

[0083] 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 the subway station, solving the problems of large occupied launching space of the existing pipe jacking machine 100 and the need to expand and excavate the existing tunnel 200, as well as the problem that grouting and bottom-sealing cannot be carried out under pressure after tunneling in place. Its core invention points include: the drum-type cutter head 203 for rectangular full-section cutting and rolling excavation, the jacking system 1 with a parallelogram projection on one side, the drum-type main machine 2, the rectangular pipe section 3, the split inner shield 201, the outer shield 202, and the mutually independent drum cutting units 2031 arranged at their front ends, and the pressure grouting and bottom-sealing when the inner shield 201 retracts.

[0084] 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 the subway station.

[0085] The core components include the jacking system 1, the drum-type main machine 2 with an inner and outer double-layer shield structure, the traction system 4, and the rear support system, etc. The drum-type main machine 2 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 suitable for 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 top shoes 101, jacking cylinders 102, and jacking irons 103. The thrust of the jacking cylinders 102 is transmitted to the drum-type main machine 2 through the jacking irons 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 in the well as a permanent structure after jacking. The inner shield 201 is separated from the outer shield 202 by a sealing component 204 to maintain the sealing state of 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.

[0086] In the underground space inclined shaft rectangular pipe jacking machine 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 picks 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 component between the inner and outer shields ensures the airtightness of the underground construction space and avoids the influence of water and soil pressure on tunneling. Compared with the prior art, through the design of the pressurized retraction function, the pipe jacking machine of the present invention is more flexible in blind well 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.

[0087] The details not described in the present invention are all conventional technical means well known to those skilled in the art.

[0088] 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 principles 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, including a drum-type main machine, characterized in that: One side projection 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 towing 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.

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

3. The rectangular pipe jacking machine for inclined shaft in underground space according to claim 1 or 2, wherein: The jacking system includes a top shoe, a jacking oil cylinder, and a jacking iron connected in sequence. The jacking directions of several jacking oil cylinders between the top shoe and the jacking iron are all parallel to the axis of the outer shield.

4. The rectangular pipe jacking machine for inclined shaft in underground space according to claim 3, characterized in that: The rear end face shape of the outer shield is the same as the rear end face shape of the rectangular pipe section and includes a first support surface, a second support surface, a third support surface, and a fourth support surface respectively adapted to the front end face of the rectangular pipe section 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 starting tunnel, and the first support surface and the third support surface are perpendicular to the jacking direction.

5. The rectangular pipe jacking machine for inclined shafts in underground space according to claim 4, characterized in that: Several oil cylinder support surfaces are arranged at the rear end of the jacking iron and the front end of the top shoe, and each oil cylinder support surface is perpendicular to the jacking direction.

6. The rectangular pipe jacking machine for inclined shafts in underground space according to any one of claims 1, 2, 4, and 5, characterized in that: The drum-type cutter head includes several drum cutting units.

7. The rectangular pipe jacking machine for inclined shaft in underground space according to claim 6, characterized in that: The drum cutting unit includes a built-in motor for driving the drum to rotate, and several hob cutters and / or picks are arranged on the outer surface of the drum.

8. A construction method for a rectangular pipe jacking machine in an inclined shaft of underground space, characterized in that: Use the underground space inclined shaft rectangular pipe jacking machine according to any one of claims 1-7 for blind shaft construction and inner shield retraction construction.

9. The construction method of the rectangular pipe jacking machine for inclined shafts in underground spaces according to claim 8, characterized in that: During blind shaft construction, when the jacking system is installed at the top of the starting tunnel and the drum-type main machine is jacked to excavate the installation space of the rectangular pipe section, the jacking system retracts. The rectangular pipe section is lowered at the rear end of the drum-type main machine. Subsequently, the jacking system jacks the drum-type main machine through the rectangular pipe section to continue excavating a new rectangular pipe section installation space downward. Subsequently, a new rectangular pipe section is installed, and so on in a cycle until the drum-type cutter head excavates to the bottom of the inclined shaft.

10. The construction method of the rectangular pipe jacking machine for inclined shafts in underground spaces according to claim 8 or 9, characterized in that: During the inner shield retraction construction, grouting and bottom sealing construction are carried out simultaneously. The connection structure between the inner shield and the outer shield is removed. Bottom-sealing concrete is injected into the inclined shaft face through the slag discharge pipe, and the air in the inclined shaft face is discharged through the grouting pipe. At the same time, under the action of maintaining the face pressure, the inner shield is slowly retracted along the outer shield by using the traction system. After the grouting and bottom sealing construction is completed, the inner shield is completely separated from the outer shield by using the traction system until it retracts to the starting tunnel.

11. A construction method for a rectangular pipe jacking machine in an inclined shaft of underground space, characterized in that: When there is an existing receiving tunnel that has been constructed, use the underground space inclined shaft rectangular pipe jacking machine according to any one of claims 1-7 for through construction, and a receiving sleeve for receiving the drum-type main machine is arranged in the receiving tunnel.

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