Connecting structure and construction method between shield tunnel and narrow existing underground space

Abstract

The present invention relates to a connecting structure between a shield tunnel and a narrow existing underground space, comprising: a hole opened on the bottom plate of the underground space; a first pipe section is driven into the soil between the underground space and the shield tunnel at the hole, and the soil in the first pipe section is excavated during the process of driving the first pipe section into the soil, and a first connecting space is formed inside the first pipe section; a second pipe section is driven downwardly corresponding to the first pipe section at the hole, and a second connecting space connected to the first connecting space is formed inside the second pipe section, and the soil in the first pipe section is excavated during the process of pressing the first pipe section downward; and a steel pipe segment is arranged at the top of the shield tunnel and corresponds to the position of the hole, the steel pipe segment is fixedly connected to the first pipe segment, and a connecting port is opened in the steel pipe segment corresponding to the first connecting space, and the first connecting space is connected to the shield tunnel through the connecting port. The present application solves the problem that a connecting structure cannot be constructed between a low headroom, narrow existing underground space and a shield tunnel.

Description

Technical Field

[0001] The invention relates to the field of building technology, and in particular to a connecting structure between a shield tunnel and a narrow existing underground space and a construction method. Background Art

[0002] With the rapid development of my country's urban economy and the sharp increase in urban population density, shield tunnels have gradually become the only choice for the construction of urban roads and rail transit in urban core areas, due to constraints such as land resources, environmental protection, and natural barriers. Shield tunnels generally need to establish spatial connections with the ground at a certain distance to meet the requirements of ventilation, wiring, maintenance, etc. Since the construction of urban roads and rail transit in the core areas of cities is generally later than the construction of ground buildings, shield tunnels generally need to pass under ground buildings, resulting in no space on the ground for the construction of enclosure structures to build vertical connection channels between shield tunnels and the ground. If the method of demolition and reconstruction is adopted, although the connection problem between the shield tunnel and the ground space can be solved, it will have a huge impact on existing buildings, urban operations, and urban environment.

[0003] The basement space of existing buildings generally has the problem of low headroom and narrow space because the subsequent use requirements are not taken into consideration. The existing underground space added downward by the existing building also has the problem of low headroom and narrow space. For the existing underground space with low headroom and narrow space, the shield tunnel and the connecting structure of the existing underground space are usually avoided. However, in actual construction, there are often complex construction situations where the existing underground space occupies a large area and cannot be avoided, or according to the shield tunnel design requirements, the connecting structure must be constructed between the low headroom and narrow existing underground space and the shield tunnel.

[0004] Therefore, there is an urgent need to provide a connecting structure and construction method between a shield tunnel and a narrow existing underground space that can connect a low-headroom, narrow existing underground space with a shield tunnel to solve the above-mentioned technical problems. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a connecting structure and construction method between a shield tunnel and a narrow existing underground space, so as to solve the problem that a connecting structure cannot be constructed between the existing low clearance, narrow existing underground space and the shield tunnel.

[0006] To achieve the above object, the present invention provides a connecting structure between a shield tunnel and a narrow existing underground space, comprising:

[0007] A hole opened on the floor of the underground space;

[0008] A first pipe segment is driven into the soil between the underground space and the shield tunnel at the hole, and the soil in the first pipe segment is excavated during the driving of the first pipe segment into the soil, so that a first communicating space is formed inside the first pipe segment;

[0009] A plurality of second pipe sections are driven downwardly at the hole corresponding to the first pipe section, a second connecting space connected to the first connecting space is formed inside the second pipe section, and the first pipe section is pressed down by the plurality of second pipe sections so that the end of the first pipe section is connected to the top of the shield tunnel, and the soil inside the first pipe section is excavated during the process of pressing down the first pipe section; and

[0010] A steel pipe segment is arranged at the top of the shield tunnel and corresponds to the position of the hole. The steel pipe segment is fixedly connected to the first pipe segment, and a connecting port is opened in the steel pipe segment corresponding to the first connecting space, so that the first connecting space is connected to the shield tunnel through the connecting port.

[0011] The present invention opens a hole on the bottom plate of the underground space, and sequentially drives a first pipe segment and a plurality of second pipe segments into the soil between the underground space and the shield tunnel at the hole, and presses the first pipe segment and the plurality of second pipe segments downward until the end of the first pipe segment is connected to the steel pipe segment on the top of the shield tunnel, and the end of the first pipe segment is welded and fixed to the steel pipe segment, so that the first connecting space is connected to the shield tunnel. Since the second connecting space is connected to the first connecting space and the underground space, the shield tunnel is connected to the underground space, thereby solving the problem that a connecting structure cannot be constructed between the low-headroom, narrow existing underground space and the shield tunnel.

[0012] The steel pipe segment includes a ring beam and a cover plate. The ring beam is welded and fixed to the first pipe segment. After the cover plate is removed, the first pipe segment is connected to the shield tunnel, and the second pipe segment is connected to the first pipe segment and the underground space, thereby realizing the connection between the shield tunnel and the underground space, solving the problem that the connecting structure cannot be constructed between the low-clearance and narrow existing underground space and the shield tunnel.

[0013] A further improvement of the communication structure between the shield tunnel and the narrow existing underground space of the present invention is that the inner wall of the first pipe segment is provided with an annular ring rib, the ring rib is provided with a plurality of reserved holes, steel bars are inserted into the reserved holes, and the ends of the steel bars are fixedly connected to the top of the shield tunnel;

[0014] Concrete is sprayed onto the inner wall of the first pipe segment and the annular rib and the steel bar are embedded to form a reinforcement layer.

[0015] A further improvement of the connecting structure between the shield tunnel and the narrow existing underground space of the present invention is that a water stop strip is provided at the connection between the inner wall of the first pipe section and the shield tunnel.

[0016] A further improvement of the connecting structure between the shield tunnel and the narrow existing underground space of the present invention is that the steel pipe segment includes a ring beam and a cover plate fixedly connected to the end of the first pipe segment, the ring beam encloses the connecting port, and the cover plate is detachably installed at the connecting port.

[0017] A further improvement of the connecting structure between the shield tunnel and the narrow existing underground space of the present invention is that two adjacent second pipe sections are fixedly connected by bolts and an expansion joint with a certain gap is formed at the connection end.

[0018] The present invention also provides a construction method for a connecting structure between the shield tunnel and a narrow existing underground space, comprising the following steps:

[0019] Opening holes in the floor of the underground space;

[0020] Providing a first pipe section, transporting the first pipe section to the hole, pressing the first pipe section into the soil at the hole in the direction of the shield tunnel and simultaneously excavating the soil in the first pipe section;

[0021] Providing a second pipe section, transporting the second pipe section to the hole, and when the top of the first pipe section is close to the soil, fixing the second pipe section to the first pipe section, pressing down the second pipe section so that the second pipe section and the first pipe section sink together in the soil and simultaneously excavating the soil in the first pipe section;

[0022] When the top of the second pipe section approaches the soil, another second pipe section is fixedly connected to the previous second pipe section, and the second pipe section at the top is pressed down, so that the second pipe section and the first pipe section sink together in the soil and the soil in the first pipe section is removed at the same time. According to this step, a plurality of second pipe sections are pressed into the soil;

[0023] When the first pipe section sinks to the top of the shield tunnel, the bottom end of the first pipe section is welded and fixed to the steel pipe segment, and a connecting port is opened on the steel pipe segment to connect the first connecting space with the shield tunnel.

[0024] A further improvement of the construction method of the connecting structure between the shield tunnel and the narrow existing underground space of the present invention is that the inner wall of the first pipe segment is provided with an annular ring rib, and the ring rib is provided with a plurality of reserved holes, and the end of the steel bar is fixedly connected to the top of the shield tunnel; after the bottom end of the first pipe segment is fixedly welded to the steel pipe segment, the following steps are further included:

[0025] Providing steel bars, and inserting the steel bars into the reserved holes;

[0026] Concrete is sprayed onto the inner wall of the first pipe segment to embed the annular rib and the steel bar.

[0027] A further improvement of the construction method of the connecting structure between the shield tunnel and the narrow existing underground space of the present invention is that after providing steel bars and inserting the steel bars into the reserved holes, the following steps are also included:

[0028] A water stop strip is provided, and is arranged between the inner wall of the first pipe section and the shield tunnel.

[0029] A further improvement of the construction method of the connecting structure between the shield tunnel and the narrow existing underground space of the present invention is that a hole is opened at the bottom plate of the underground space, comprising the following steps:

[0030] Provide beams and columns, and cross-arrange a plurality of beams on the bottom plate corresponding to the areas where the holes are to be opened to form the areas where the holes are to be opened, and set columns at the intersections of the beams to open holes in the areas where the holes are to be opened.

[0031] A further improvement of the construction method of the connecting structure between the shield tunnel and the narrow existing underground space of the present invention is that the steel pipe segment includes a ring beam and a cover plate fixedly connected to the end of the first pipe segment, the ring beam encloses the connecting port, and the cover plate is detachably installed at the connecting port; when the first pipe segment is sunk to the top of the shield tunnel, the bottom end of the first pipe segment is welded and fixed to the steel pipe segment, and a connecting port is opened on the steel pipe segment to connect the first connecting space with the shield tunnel, comprising the following steps:

[0032] When the first pipe segment is sunk to the ring beam, the bottom end of the first pipe segment is welded and fixed to the ring beam, and the cover plate on the ring beam is removed to connect the first connecting space with the shield tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a state diagram of the connecting structure between the shield tunnel of the present invention and the narrow existing underground space during construction.

[0034] In the figure: the first pipe section 1, the second pipe section 2, the blade foot 11, the steel pipe segment 3, the shield tunnel 4, the underground space 5, the bottom plate 6, the horizontal track 7, the reaction frame 8, and the electric hoist 9. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] The present invention provides a connecting structure between a shield tunnel and a narrow existing underground space, which is used for ventilation, maintenance and wiring of the shield tunnel. The present invention includes a hole, a first pipe section, a second pipe section and a steel pipe segment. A hole is opened on the bottom plate of the underground space, and the first pipe section and a plurality of second pipe sections are sequentially driven into the soil between the underground space and the shield tunnel at the hole, and the first pipe section and the plurality of second pipe sections are pressed down until the end of the first pipe section is connected to the steel pipe segment at the top of the shield tunnel. The end of the first pipe section is welded and fixed to the steel pipe segment, so that the first connecting space is connected to the shield tunnel. Since the second connecting space is connected to the first connecting space and the underground space, the shield tunnel is connected to the underground space, solving the problem that the connecting structure cannot be constructed between the low headroom, narrow existing underground space and the shield tunnel.

[0037] The construction method of the connecting structure between the shield tunnel and the narrow existing underground space of the present invention is described below with reference to the accompanying drawings.

[0038] See also Figure 1 , which is a state diagram of the connecting structure between the shield tunnel of the present invention and the narrow existing underground space during construction. In this embodiment, a connecting structure between a shield tunnel and a narrow existing underground space includes: a hole opened on a bottom plate 6 of an underground space 5, a first pipe segment 1 driven into the soil between the underground space 5 and the shield tunnel 4 at the hole, a plurality of second pipe segments 2 driven downwardly corresponding to the first pipe segment 1 at the hole, and a steel pipe segment 3 provided at the top of the shield tunnel 4 and corresponding to the position of the hole. In the process of driving the first pipe segment 1 into the soil, the soil in the first pipe segment 1 is excavated, a first connecting space is formed inside the first pipe segment 1, a second connecting space connected to the first connecting space is formed inside the second pipe segment 2, and the first pipe segment 1 is pressed down by the plurality of second pipe segments 2 so that the end of the first pipe segment 1 is connected to the top of the shield tunnel 4. In the process of pressing down the first pipe segment 1, the soil in the first pipe segment 1 is excavated, the steel pipe segment 3 is fixedly connected to the first pipe segment 1, and a connecting port is opened in the steel pipe segment 3 corresponding to the first connecting space, and the first connecting space is connected to the shield tunnel 4 through the connecting port.

[0039] The present invention opens a hole on the bottom plate 6 of the underground space 5, and sequentially drives a first pipe segment 1 and a plurality of second pipe segments 2 into the soil between the underground space 5 and the shield tunnel 4 at the hole, and presses the first pipe segment 1 and the plurality of second pipe segments 2 downward until the end of the first pipe segment 1 is connected to the steel pipe segment 3 at the top of the shield tunnel 4, and the end of the first pipe segment 1 is welded and fixed to the steel pipe segment 3, so that the first connecting space is connected to the shield tunnel 4. Since the second connecting space is connected to the first connecting space and the underground space 5, the shield tunnel 4 is connected to the underground space 5, thereby solving the problem that a connecting structure cannot be constructed between the existing underground space 5 with low clearance and narrow space and the shield tunnel 4.

[0040] Furthermore, the inner wall of the first pipe section 1 is provided with an annular ring rib, and a plurality of reserved holes are opened on the ring rib, and steel bars are inserted into the reserved holes, and the ends of the steel bars are fixedly connected to the top of the shield tunnel 4. Concrete is sprayed on the inner wall of the first pipe section 1 and the ring rib and steel bars are buried to form a reinforcement layer. Preferably, the steel bars extend into the steel pipe segment and are welded and fixed to the steel pipe segment. The ends of the steel bars are fixedly connected to the top of the shield tunnel 4, and the ring rib and steel bars are buried in the reinforcement layer to connect the first pipe section 1 to the shield tunnel 4 to form an integral structure, thereby enhancing the connection strength between the first pipe section 1 and the shield tunnel 4, and also enhancing the structural strength of the first pipe section 1.

[0041] Furthermore, a water stop strip is provided at the connection between the inner wall of the first pipe section 1 and the shield tunnel 4 to prevent water seepage at the connection between the first pipe section 1 and the shield tunnel 4 .

[0042] Furthermore, the steel pipe segment 3 includes a ring beam and a cover plate fixedly connected to the end of the first pipe segment 1, the ring beam encloses a connecting port, and the cover plate is detachably installed at the connecting port.

[0043] In a specific embodiment, the ring beam includes a first top plate in the shape of an arc surface, a plurality of first transverse plates and a first longitudinal plate arranged under the first top plate in a grid-like manner. The cover plate includes a second top plate in the shape of an arc surface, a plurality of second transverse plates and a second longitudinal plate arranged under the second top plate in a grid-like manner. The first transverse plate and the corresponding second transverse plate, and the first longitudinal plate and the corresponding second longitudinal plate are detachably installed by bolts so that the ring beam and the cover plate can be detachably installed.

[0044] Preferably, the ring beam is enclosed by four L-shaped connecting parts to form a U-shape, and the cover plate is spliced ​​by four square-shaped mounting parts to form a square shape. The connecting part has a notch, the mounting part is adapted to the notch, and the mounting part is detachably mounted on the connecting part.

[0045] Furthermore, two adjacent second pipe segments 2 are fixedly connected by bolts and an expansion joint with a certain gap is formed at the connection end to prevent the subsequent settlement of the shield tunnel 4 during operation from having an adverse effect on the connecting structure.

[0046] See also Figure 1 In one embodiment, the bottom end of the first pipe section 1 is in an arc shape that is concave inwards and is formed with a blade foot 11. The arc shape of the bottom end of the first pipe section 1 that is concave inwards can be adapted to the arc-shaped top surface of the shield tunnel 4, so that the bottom end of the first pipe section 1 is completely attached to and fixed to the top surface of the shield tunnel 4. The blade foot 11 facilitates the downward pressing of the first pipe section 1 to cut the soil.

[0047] Specifically, the first pipe section 1 is a steel pipe section, which is convenient for pressing down the first pipe section 1 to make it sink in the soil; the second pipe section 2 is a concrete pipe section, which can save costs. The lengths of the first pipe section 1 and the second pipe section 2 are relatively short to adapt to the construction of the existing low-headroom underground space 5. The first pipe section 1 is fixedly connected to the second pipe section 2 by bolts, and two adjacent second pipe sections 2 are fixedly connected by bolts.

[0048] The construction process of the connecting structure between the shield tunnel and the narrow existing underground space of the present invention is described below.

[0049] A hole is opened at the bottom plate 6 of the underground space 5, a first pipe section 1 is provided, the first pipe section 1 is transported to the hole, and the soil in the first pipe section 1 is excavated while being pressed into the soil in the direction of the shield tunnel 4 at the hole, a second pipe section 2 is provided, the second pipe section 2 is transported to the hole, and when the top of the first pipe section 1 is close to the soil, the second pipe section 2 is fixedly connected to the first pipe section 1, the second pipe section 2 is pressed down so that the second pipe section 2 and the first pipe section 1 sink together in the soil, and the soil in the first pipe section 1 is excavated while being waited for the second pipe section 2 to be lowered. When the top of the second pipe segment 2 is close to the soil, the other second pipe segment 2 is fixedly connected to the previous second pipe segment 2, and the second pipe segment 2 at the top is pressed down, so that the second pipe segment 2 and the first pipe segment 1 sink together in the soil and the soil in the first pipe segment 1 is excavated at the same time. According to this step, several second pipe segments 2 are pressed into the soil. When the first pipe segment 1 sinks to the top of the shield tunnel 4, the bottom end of the first pipe segment 1 is welded and fixed to the steel pipe segment 3. A connecting port is opened on the steel pipe segment 3 to connect the first connecting space with the shield tunnel 4.

[0050] See also Figure 1 The present invention also provides a construction method for a connecting structure between the shield tunnel and the narrow existing underground space, comprising the following steps:

[0051] A hole is opened at the bottom plate 6 of the underground space 5.

[0052] A first pipe segment 1 is provided, transported to a hole, pressed into soil in the direction of the shield tunnel 4 at the hole, and soil in the first pipe segment 1 is removed simultaneously.

[0053] Provide a second pipe section 2, transport the second pipe section 2 to the hole, and when the top of the first pipe section 1 is close to the soil, fix the second pipe section 2 to the first pipe section 1, press down the second pipe section 2 so that the second pipe section 2 and the first pipe section 1 sink together in the soil and simultaneously excavate the soil in the first pipe section 1.

[0054] When the top of the second pipe section 2 is close to the soil, another second pipe section 2 is fixedly connected to the previous second pipe section 2, and the second pipe section 2 at the top is pressed down, so that the second pipe section 2 and the first pipe section 1 sink together in the soil and the soil in the first pipe section 1 is excavated at the same time. According to this step, several second pipe sections 2 are pressed into the soil.

[0055] When the first pipe segment 1 sinks to the top of the shield tunnel 4 , the bottom end of the first pipe segment 1 is welded and fixed to the steel pipe segment 3 , and a connecting port is opened on the steel pipe segment 3 to connect the first connecting space with the shield tunnel 4 .

[0056] Furthermore, the inner wall of the first pipe section 1 is provided with an annular ring rib, and a plurality of reserved holes are opened on the ring rib, and the end of the steel bar is fixedly connected to the top of the shield tunnel 4; after the bottom end of the first pipe section 1 is welded and fixed to the steel pipe segment 3, the following steps are also included:

[0057] Provide steel bars and insert them into the reserved holes;

[0058] Concrete is sprayed onto the inner wall of the first pipe section 1 and the annular ribs and steel bars are embedded so that the inner diameter of the first pipe section 1 is equal to the inner diameter of the second pipe section 2.

[0059] Furthermore, after providing the steel bars and inserting the steel bars into the reserved holes, the following steps are also included:

[0060] A water stop strip is provided and arranged between the inner wall of the first pipe section 1 and the shield tunnel 4 .

[0061] Further, the steel pipe segment 3 includes a ring beam and a cover plate fixedly connected to the end of the first pipe segment 1, the ring beam encloses to form a communication port, and the cover plate is detachably installed at the communication port; when the first pipe segment 1 is sunk to the top of the shield tunnel 4, the bottom end of the first pipe segment 1 is welded and fixed to the steel pipe segment 3, and a communication port is opened on the steel pipe segment 3 to connect the first communication space with the shield tunnel 4, including the following steps:

[0062] When the first pipe segment 1 sinks to the ring beam, the bottom end of the first pipe segment 1 is welded and fixed to the ring beam, and the cover plate on the ring beam is removed to connect the first connecting space with the shield tunnel 4.

[0063] Furthermore, a hole is opened at the bottom plate 6 of the underground space 5, including the following steps:

[0064] Before opening a hole in the bottom plate 6, a beam-column system is required to reinforce the bottom plate 6 where the hole is to be opened, so as to prevent the hole in the bottom plate 6 from affecting the structural stability of the bottom plate 6. Beams and columns are provided, and a plurality of beams are cross-arranged on the bottom plate 6 at the area where the hole is to be opened, and the cross-arrangements are formed to form the area where the hole is to be opened. The columns are arranged at the intersection of the beams, and the hole is opened in the area where the hole is to be opened.

[0065] Furthermore, before the holes are opened at the bottom plate 6 of the underground space 5, the following steps are also included:

[0066] Provide a horizontal track 7, a reaction frame 8, a jack and an electric hoist 9, install the horizontal track 7 and the reaction frame 8 at the position to be constructed corresponding to the connecting structure on the bottom plate 6, install the electric hoist 9 on the reaction frame 8, and install the jack corresponding to the reaction frame 8. The horizontal track 7, the reaction frame 8, the jack and the electric hoist 9 that can be installed in the existing underground space 5 with low clearance and narrow space have little impact on the existing structure, the construction site is limited to the underground space 5, and there is no impact on the operation and appearance of the city. The horizontal track 7 is used for the horizontal transportation of the first pipe section 1 and the second pipe section 2, the electric hoist 9 is used for the vertical transportation of the first pipe section 1 and the second pipe section 2, the reaction frame 8 and the jack are used for the construction of the first pipe section 1 and the second pipe section 2 being vertically pressed into the soil. By adopting a press-in mechanical sinking method, the sinking speed and posture of the pipe section can be effectively controlled. The length of the first pipe section 1 and the second pipe section 2 is relatively short to adapt to the construction of the existing low clearance underground space 5.

[0067] Furthermore, before installing the horizontal track 7, the reaction frame 8, the jack and the electric hoist 9, the following steps are also included:

[0068] A number of holes are formed in the bottom plate 6, and cement slurry is injected into the soil under the bottom plate 6 at the holes to reinforce the soil. The soil is reinforced to 0.8-1Mpa, which enhances the structural strength of the soil, avoids the collapse of the soil during the construction of the connecting structure, and ensures the structural stability of the existing building.

[0069] By adopting the above technical solution, the present invention has the following beneficial effects:

[0070] The present invention opens a hole on the bottom plate of the underground space, and drives the first pipe section and several second pipe sections into the soil between the underground space and the shield tunnel in sequence at the hole, and presses the first pipe section and several second pipe sections downward until the end of the first pipe section is connected to the steel pipe sheet at the top of the shield tunnel. The first connecting space is connected to the shield tunnel by welding and fixing the end of the first pipe section to the steel pipe sheet. Since the second connecting space is connected to the first connecting space and the underground space, the shield tunnel is connected to the underground space, solving the problem that the connecting structure cannot be constructed between the low clearance and narrow existing underground space and the shield tunnel. The end of the steel bar is fixedly connected to the top of the shield tunnel, and the steel bar is buried in the reinforcement layer to connect the first pipe section to the shield tunnel to form an integral structure, thereby enhancing the connection strength between the first pipe section and the shield tunnel. The water stop strip is used to prevent water seepage at the connection between the first pipe section and the shield tunnel. The construction method of the connecting structure of the present invention adopts horizontal rails, reaction frames, jacks and electric hoists that can be installed in existing underground spaces with low clearance and narrow space. The impact on the existing structure is small, and the construction site is limited to the underground space, which has no impact on the operation of the city and the appearance of the city. The length of the first pipe section and the second pipe section is short to adapt to the construction of existing low-clearance underground spaces. On the one hand, soil reinforcement enhances the structural strength of the soil, avoids the collapse of the soil during the construction of the connecting structure, and ensures the structural stability of the existing building. On the other hand, it ensures that the first pipe segment can be pressed into the soil.

[0071] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

Claims

1. A connecting structure between a shield tunnel and a narrow existing underground space, characterized in that: include: A hole opened on the floor of the underground space; A first pipe segment is driven into the soil between the underground space and the shield tunnel at the hole, and the soil in the first pipe segment is excavated during the driving of the first pipe segment into the soil, so that a first communicating space is formed inside the first pipe segment; A plurality of second pipe sections are driven downwardly at the hole corresponding to the first pipe section, a second connecting space connected to the first connecting space is formed inside the second pipe section, and the first pipe section is pressed down by the plurality of second pipe sections so that the end of the first pipe section is connected to the top of the shield tunnel, and the soil inside the first pipe section is excavated during the process of pressing down the first pipe section; as well as a steel pipe segment disposed at the top of the shield tunnel and corresponding to the position of the hole, the steel pipe segment being fixedly connected to the first pipe segment, and the steel pipe segment being provided with a communication opening corresponding to the first communication space, so that the first communication space is connected to the shield tunnel through the communication opening; The inner wall of the first pipe section is provided with an annular ring rib, the annular rib is provided with a plurality of reserved holes, steel bars are inserted into the reserved holes, and the ends of the steel bars are fixedly connected to the top of the shield tunnel; spraying concrete onto the inner wall of the first pipe segment and embedding the ring rib and the steel bar to form a reinforcement layer; The steel pipe segment includes a ring beam fixedly connected to the end of the first pipe segment and a cover plate arranged on the ring beam, the ring beam encloses the connecting port, and the cover plate is detachably installed at the connecting port.

2. The connecting structure between the shield tunnel and the narrow existing underground space according to claim 1 is characterized in that: A water stop strip is provided at the connection between the inner wall of the first pipe section and the shield tunnel.

3. The connecting structure between the shield tunnel and the narrow existing underground space according to claim 1 is characterized in that: Two adjacent second pipe sections are fixedly connected by bolts and an expansion joint with a certain gap is formed at the connection ends.

4. A method for constructing a connecting structure between a shield tunnel and a narrow existing underground space, using the connecting structure as claimed in claim 2, characterized in that: The steps include: Opening holes in the floor of the underground space; Providing a first pipe section, transporting the first pipe section to the hole, pressing the first pipe section into the soil at the hole in the direction of the shield tunnel and simultaneously excavating the soil in the first pipe section; Providing a second pipe section, transporting the second pipe section to the hole, and when the top of the first pipe section is close to the soil, fixing the second pipe section to the first pipe section, pressing down the second pipe section so that the second pipe section and the first pipe section sink together in the soil and simultaneously excavating the soil in the first pipe section; When the top of the second pipe section approaches the soil, another second pipe section is fixedly connected to the previous second pipe section, and the second pipe section at the top is pressed down, so that the second pipe section and the first pipe section sink together in the soil and the soil in the first pipe section is removed at the same time. According to this step, a plurality of second pipe sections are pressed into the soil; When the first pipe section sinks to the top of the shield tunnel, the bottom end of the first pipe section is welded and fixed to the steel pipe segment, and a connecting port is opened on the steel pipe segment to connect the first connecting space with the shield tunnel; A hole is opened at the bottom plate of the underground space, including the following steps: before opening the hole at the bottom plate, a beam-column system is used to reinforce the hole-opening area at the bottom plate to prevent the hole at the bottom plate from affecting the structural stability of the bottom plate, beams and columns are provided, a plurality of beams are cross-arranged on the bottom plate at the area where the hole is to be opened and cross-arranged to form the area where the hole is to be opened, columns are arranged at the intersection of the beams, and holes are opened at the area where the hole is to be opened; The inner wall of the first pipe section is provided with an annular ring rib, and the ring rib is provided with a plurality of reserved holes. The end of the steel bar is fixedly connected to the top of the shield tunnel. After the bottom end of the first pipe section is fixedly welded to the steel pipe segment, the following steps are also included: Providing steel bars, and inserting the steel bars into the reserved holes; spraying concrete onto the inner wall of the first pipe segment and embedding the ring rib and the steel bar; The steel pipe segment includes a ring beam fixedly connected to the end of the first pipe segment and a cover plate arranged on the ring beam, the ring beam encloses the communication port, and the cover plate is detachably installed at the communication port; when the first pipe segment is sunk to the top of the shield tunnel, the bottom end of the first pipe segment is welded and fixed to the steel pipe segment, and a communication port is opened on the steel pipe segment to connect the first communication space with the shield tunnel, including the following steps: When the first pipe segment is sunk to the ring beam, the bottom end of the first pipe segment is welded and fixed to the ring beam, and the cover plate on the ring beam is removed to connect the first connecting space with the shield tunnel.

5. The method for constructing a connecting structure between a shield tunnel and a narrow existing underground space according to claim 4, characterized in that: Providing steel bars, and inserting the steel bars into the reserved holes, further comprising the following steps: A water stop strip is provided, and is arranged between the inner wall of the first pipe section and the shield tunnel.

6. The method for constructing a connecting structure between a shield tunnel and a narrow existing underground space according to claim 4, characterized in that: Opening a hole in the bottom plate of the underground space includes the following steps: Provide beams and columns, and cross-arrange a plurality of beams on the bottom plate corresponding to the areas where the holes are to be opened to form the areas where the holes are to be opened, and set columns at the intersections of the beams to open holes in the areas where the holes are to be opened.

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