Pile-cutting and top-supporting enclosure structure for transverse communication of subway and construction method of pile-cutting and top-supporting enclosure structure

Abstract

The invention relates to a pile-cutting and top-supporting enclosure structure for subway transverse communication and a construction method thereof, the pile-cutting and top-supporting enclosure structure comprises a supporting system, a cutting device, a walking device and an air bag assembly, and the supporting system is a closed rigid frame formed by bottom sliding shoes, a supporting top plate and side supporting plates; a bottom sliding shoe of the supporting system extends along the construction axis. The bottom sliding shoe is made of high-strength alloy steel. The construction influence is reduced, a gap between a concrete plate and a soil body can be filled with the air bag assembly after the air bag assembly is inflated, a continuous sealing layer is formed, disturbance to the surrounding soil body in the construction process is reduced, the influence to the surrounding environment is reduced, and meanwhile the propelling effect is improved; and stable and accurate propulsion of the support system in the construction process is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of channel excavation, and in particular to a pile-cutting and top-supporting enclosure structure for horizontal connection of subways and a construction method thereof. Background Art

[0002] Existing technologies generally use artificial mining methods to excavate passages in existing underground subway buildings. However, the support takes a long time, and there are many supporting structures to be erected. In addition, it is difficult to handle the situation where the passage passes through pile foundations. When encountering the working conditions of crossing the pile foundations of existing buildings, the efficiency of traditional pneumatic picks in cutting piles is low. A single concrete pile with a diameter of 800mm takes 2-3 working days, and the vibration of the cut piles can easily cause leakage in the joints of the existing structure. When using mechanical pile cutting machines such as hydraulic splitters, there are problems such as limited working space (usually the passage width is only 4-6 meters) and difficulty in dust control.

[0003] The use of shield machines is too expensive, and it is impossible to carry out construction and installation in real time. Shield machines have inherent defects in pile cutting operations - the tool system cannot effectively crush large-diameter reinforced concrete piles, and forced excavation may cause major failures such as cutterhead jamming and main bearing damage. Even if auxiliary measures such as pre-drilling and coring are adopted, the pile foundation treatment still needs to be completed before the arrival of the shield machine, which essentially forms a composite process of "half shield and half manual", which increases the risk of process connection. Therefore, it is more difficult to carry out effective construction for excavation construction with a small excavation depth and the need to excavate and cut piles. Summary of the invention

[0004] In order to overcome these shortcomings, the present invention proposes a pile-cutting top support structure for subway transverse connection and its construction method. The present invention adopts the following technical solutions:

[0005] A pile-cutting support roof enclosure structure for subway transverse connection, comprising a support system, a cutting device, a walking device and an airbag assembly.

[0006] The support system is composed of a bottom sliding shoe, a supporting top plate, and a side supporting plate to form a closed rigid frame; the bottom sliding shoe of the support system extends along the construction axis; the bottom sliding shoe is made of high-strength alloy steel;

[0007] The supporting top plate is a segmented assembled hollow steel plate body, with openings arranged on the upper part thereof, and each segment of the hollow steel plate body is provided with a separate inflatable airbag;

[0008] The side support plates are double-layer steel plate sandwich structures, which are respectively fixed vertically on both sides of the support top plate; the side support plates are welded to the support top plate through angle steels, and the two side support plates are connected by multiple cross bars to form a stable frame;

[0009] The cutting device includes a mounting tool holder, a rotary drilling tool and a pile cutting tool, all of which are integrated at the front end of the support system; the rotary drilling tool and the pile cutting tool are mounted on the mounting tool holder in upper and lower positions, and an excavation device is arranged at the lower part of the mounting tool holder;

[0010] The rotary drilling tool is a multi-stage screw mounted in the middle of the tool holder, which is used for layered excavation of soil; the pile cutting tool is arranged on the upper part of the rotary drilling tool, and the pile cutting tool is a hydraulic scissor-type cutting machine, which is located above the rotary drilling tool and is connected to the mounting tool holder through a telescopic arm; the cutter head is made of tungsten steel, and has a built-in pressure sensor, which feeds back the cutting resistance to the control system in real time;

[0011] The cutting device is located at the front end of the support system, and the rotary drilling tool and the pile cutting tool are arranged front and back along the propulsion direction; the pushing hydraulic cylinder of the walking device is arranged at the rear of the support system; the airbag assembly is extended to the upper surface of the support top plate by pressurization, and fits tightly with the upper concrete plate and the soil.

[0012] An excavation support is arranged below the installation knife seat, and an excavation leakage port is arranged on the excavation support. Soil falls onto the crawler excavation assembly through the excavation leakage port, thereby ensuring that the excavated soil is transported out in time.

[0013] Airbag assembly: including prefabricated airbag and sheath;

[0014] The prefabricated airbag is a long hollow rubber structure, which is laid horizontally between the supporting top plate and the soil, and the two ends are connected to the air pump through quick connectors;

[0015] The inflation pressure of the airbag is 0.2-0.5MPa, and a pressure balance valve is provided inside to automatically release pressure when the soil pressure exceeds the limit;

[0016] Traveling device: including push hydraulic cylinder and reaction seat;

[0017] The pushing hydraulic cylinder is symmetrically arranged at the rear of the support system, one end of the pushing hydraulic cylinder supports the side support plate, and the other end is installed on the reaction seat.

[0018] The rotary drilling tool and the pile cutting tool operate synchronously through a linkage controller. Every time the rotary drilling tool advances 1.5m, the pile cutting tool is activated to cut off the exposed existing pile foundation.

[0019] The surface of the spiral blade of the rotary drilling tool is plated with a tungsten carbide coating, and the blade spacing is 200 mm.

[0020] The invention also includes a construction method of a pile-cutting top supporting enclosure structure for a subway transverse connection, comprising the following steps:

[0021] Step 1: Lay the bottom sliding shoes along the construction axis, install the support system frame accordingly, and calibrate the inclination angle of the side support plate;

[0022] Step 2: Start the rotary drilling tool to excavate the soil in front. When encountering the pile of the building, cut off the existing pile foundation simultaneously. Pause after advancing 1.5m, and start the walking device to push the support system forward;

[0023] Step 3: Airbags are pre-installed in the supporting top plate. After a section of construction, the airbags are pressurized until the horizontal connection of the subway is completed. At this time, the airbags completely fill the space between the soil layer and the supporting top plate. The walking device is further fully advanced. At the same time, a prefabricated support corridor is constructed. The upper part is filled with grouting while the airbags are deflated.

[0024] The pile-cutting and top-supporting enclosure structure for subway transverse connection and the construction method thereof of the present invention have the following significant beneficial effects:

[0025] 1. Efficient construction: the rotary drilling tool and the pile cutting tool work synchronously through the linkage controller. The pile cutting tool is activated once every 1.5m of advancement, which can quickly cut off the exposed existing pile foundation and improve construction efficiency.

[0026] 2. To enhance safety, the support system uses bottom sliding shoes made of high-strength alloy steel, which are continuously laid along the construction axis and fixed by anchor bolts. This can effectively prevent the structure from displacement or settlement during construction and ensure construction safety.

[0027] 3. Improve adaptability. The supporting top plate is a segmented assembled hollow steel plate. Each segment is equipped with a separate inflatable airbag. It can be flexibly assembled and adjusted according to the actual construction situation to adapt to different construction environments.

[0028] 4. Reduce the impact of construction. After the airbag assembly is inflated, it can fill the gap between the concrete slab and the soil to form a continuous sealing layer, reduce the disturbance of the surrounding soil during construction, and reduce the impact on the surrounding environment.

[0029] 5. To improve the propulsion effect, the push hydraulic cylinders of the walking device are symmetrically arranged at the tail of the support system to ensure that the support system is pushed forward smoothly and accurately during the construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the channel before construction of the present invention;

[0032] Figure 2 This is a schematic diagram of the channel after construction of the present invention;

[0033] Figure 3 It is a schematic diagram of the pile-cutting and top-supporting enclosure structure of the present invention;

[0034] Figure 4 It is a schematic diagram of the positions of the rotary drilling tool and the pile cutting tool of the present invention;

[0035] Figure 5 It is a schematic diagram of the structure of the airbag assembly of the present invention.

[0036] Description of reference numerals:

[0037] 1-support system, 11-bottom sliding shoe, 12-support top plate, 121-air bag, 13-side support plate, 2-cutting device, 21-installation tool holder, 22-rotary drilling tool, 23-pile cutting tool, 24-excavation device, 25-excavation foundation, 26-excavation leak, 27-crawler excavation assembly, 3-travel device, 31-thrust hydraulic cylinder, 33-reaction seat, 4-air bag assembly, 41-prefabricated air bag, 42-air valve. DETAILED DESCRIPTION

[0038] The following description of the embodiments will help the public better understand the present invention, but the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solutions of the present invention. Any changes to the definitions of components or technical features, or formal rather than substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solutions of the present invention.

[0039] In this application, unless otherwise clearly specified or limited, the terms "installation", "connection", "fixation" and the like 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 an indirect connection through an intermediate medium, or it can be internal communication between two elements, or it can be only surface contact, or surface contact connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Embodiment 1:

[0041] A pile-cutting support roof enclosure structure for subway transverse connection, comprising a support system, a cutting device, a walking device and an airbag assembly.

[0042] The support system 1 is composed of a bottom sliding shoe 11, a supporting top plate 12, and a side supporting plate 13 to form a closed rigid frame; the bottom sliding shoe 11 of the support system 1 extends along the construction axis; the bottom sliding shoe 11 is made of high-strength alloy steel;

[0043] The supporting top plate 12 is a segmented assembled hollow steel plate body, with an opening arranged on the upper portion thereof, and each segment of the hollow steel plate body is provided with a separate inflatable airbag 121;

[0044] The side support plates 13 are double-layer steel plate sandwich structures, which are vertically fixed to the two sides of the support top plate 12; the side support plates 13 are welded to the support top plate 12 through angle steels, and the two side support plates 13 are connected by multiple cross bars to form a stable frame;

[0045] The cutting device 2 includes a mounting tool holder 21, a rotary drilling tool 22 and a pile cutting tool 23, all of which are integrated at the front end of the support system 1; the rotary drilling tool 22 and the pile cutting tool 23 are mounted on the mounting tool holder 21 in upper and lower positions, and an excavation device 24 is provided at the lower part of the mounting tool holder 21;

[0046] The rotary drilling tool 22 is a multi-stage screw mounted in the middle of the tool holder 21, and is used for layered excavation of soil; the pile cutting tool 23 is arranged on the upper part of the rotary drilling tool 22, and the pile cutting tool 23 is a hydraulic shear-type cutting machine, which is located above the rotary drilling tool 22 and is connected to the mounting tool holder 21 through a telescopic arm; its cutter head is made of tungsten steel, and has a built-in pressure sensor, which feeds back the cutting resistance to the control system in real time;

[0047] The cutting device 2 is located at the front end of the support system 1, and the rotary drilling tool 22 and the pile cutting tool 23 are arranged front and back along the propulsion direction; the pushing hydraulic cylinder 31 of the walking device 3 is arranged at the rear of the support system 1; the airbag assembly 4 is extended out of the upper surface of the supporting top plate 12 by pressurization, and fits tightly with the upper concrete plate and the soil.

[0048] An excavation support 25 is provided below the installation knife seat 21, and an excavation leakage port 26 is provided on the excavation support 25. The soil falls onto the crawler excavation assembly 27 through the excavation leakage port, so as to ensure that the excavated soil is transported out immediately.

[0049] Airbag assembly 4: includes a prefabricated airbag 41, an air valve 42 and an air pump;

[0050] The prefabricated airbag 41 is a long hollow rubber structure, which is laid horizontally between the supporting top plate 12 and the soil, and the two ends are connected to the air pump through quick connectors;

[0051] The inflation pressure of the airbag 41 is 0.2-0.5MPa, and a pressure balance valve is provided inside to automatically release pressure when the soil pressure exceeds the limit;

[0052] The walking device 3 includes a push hydraulic cylinder 31 and a reaction seat 33;

[0053] The pushing hydraulic cylinder 31 is symmetrically arranged at the rear of the support system 1 , one end of the pushing hydraulic cylinder 31 supports the side support plate 13 , and the other end is installed on the reaction seat 33 .

[0054] The rotary drilling tool 22 and the pile cutting tool 23 operate synchronously through a linkage controller. Every time the rotary drilling tool 22 advances 1.5 m, the pile cutting tool 23 is activated to cut off the exposed existing pile foundation.

[0055] The surface of the spiral blades of the rotary drilling tool 22 is plated with a tungsten carbide coating, and the blade spacing is 200 mm.

[0056] Embodiment 2:

[0057] A pile-cutting support roof enclosure structure for subway transverse connection, comprising a support system, a cutting device, a walking device and an airbag assembly.

[0058] The support system 1 is composed of a bottom sliding shoe 11, a supporting top plate 12, and a side supporting plate 13 to form a closed rigid frame; the bottom sliding shoe 11 of the support system 1 extends along the construction axis; the bottom sliding shoe 11 is made of high-strength alloy steel;

[0059] The supporting top plate 12 is a segmented assembled hollow steel plate body, with an opening arranged on the upper portion thereof, and each segment of the hollow steel plate body is provided with a separate inflatable airbag 121;

[0060] The side support plates 13 are double-layer steel plate sandwich structures, which are vertically fixed to the two sides of the support top plate 12; the side support plates 13 are welded to the support top plate 12 through angle steels, and the two side support plates 13 are connected by multiple cross bars to form a stable frame;

[0061] Among them, the sliding shoe adopts an integrated semicircular base, and the part of the sliding shoe that contacts the ground is made of polytetrafluoroethylene material.

[0062] Particularly, side support plates are installed on both sides of the sliding shoe, an excavation device is arranged in the middle, and a hydraulic device can be arranged at the end of the sliding shoe. The reaction seat can be an inclined column pier cast in situ after traveling a certain distance.

[0063] In addition, a construction method of a pile-cutting and top-supporting enclosure structure for a subway transverse connection is provided, comprising the following steps:

[0064] Step 1: Lay the bottom sliding shoe 11 along the construction axis, install the support system 1 frame accordingly, and calibrate the inclination angle of the side support plate 13;

[0065] Step 2: Start the rotary drilling tool 22 to excavate the soil in front, and when encountering the pile of the building, cut off the existing pile foundation synchronously, pause after advancing 1.5m, and start the walking device 3 to push the support system 1 forward;

[0066] Step three: An airbag 41 is pre-installed in the supporting top plate 12. After a section of construction, the airbag 41 is pressurized until the horizontal connection of the subway is completed. At this time, the airbag 41 completely fills the space between the soil layer and the supporting top plate 12, and the walking device 3 is further fully advanced. At the same time, a prefabricated support corridor is constructed. The upper part is filled with grouting while the airbag is deflated.

[0067] Those skilled in the art should understand that those skilled in the art can implement variations by combining the prior art and the above embodiments, which will not be described in detail here. Such variations do not affect the essential content of the present invention, and will not be described in detail here.

[0068] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the present invention without departing from the scope of the technical solutions of the present invention, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention are still within the scope of protection of the technical solutions of the present invention.

Claims

1. A pile-cutting and top-supporting enclosure structure for subway transverse connection, comprising a support system, a cutting device, a walking device and an airbag assembly, characterized in that: The support system is composed of a bottom sliding shoe, a supporting top plate, and a side supporting plate to form a closed rigid frame; the bottom sliding shoe of the support system extends along the construction axis; the bottom sliding shoe is made of high-strength alloy steel; The supporting top plate is a segmented assembled hollow steel plate body, with openings arranged on the upper part thereof, and each segment of the hollow steel plate body is provided with a separate inflatable airbag; The side support plates are double-layer steel plate sandwich structures, which are respectively fixed vertically on both sides of the support top plate; the side support plates are welded to the support top plate through angle steels, and the two side support plates are connected by multiple cross bars to form a stable frame; The cutting device includes a mounting tool holder, a rotary drilling tool and a pile cutting tool, all of which are integrated at the front end of the support system; the rotary drilling tool and the pile cutting tool are mounted on the mounting tool holder in upper and lower positions, and an excavation device is arranged at the lower part of the mounting tool holder; The rotary drilling tool is a multi-stage screw mounted in the middle of the tool holder, which is used for layered excavation of soil; the pile cutting tool is arranged on the upper part of the rotary drilling tool, and the pile cutting tool is a hydraulic scissor-type cutting machine, which is located above the rotary drilling tool and is connected to the mounting tool holder through a telescopic arm; The cutter head is made of tungsten steel and has a built-in pressure sensor, which provides real-time feedback of cutting resistance to the control system; The cutting device is located at the front end of the support system, and the rotary drilling tool and the pile cutting tool are arranged front and back along the propulsion direction; the pushing hydraulic cylinder of the walking device is arranged at the rear of the support system; the airbag assembly is extended to the upper surface of the support top plate by pressurization, and fits tightly with the upper concrete plate and the soil.

2. The pile-cutting and top-supporting enclosure structure for subway transverse connection according to claim 1 is characterized in that: An excavation support is arranged below the installation knife seat, and an excavation leakage port is arranged on the excavation support. Soil falls onto the crawler excavation assembly through the excavation leakage port, thereby ensuring that the excavated soil is transported out in time.

3. The pile-cutting and top-supporting enclosure structure for subway transverse connection according to claim 1 is characterized in that: Airbag assembly: including prefabricated airbag and sheath; The prefabricated airbag is a long hollow rubber structure, which is laid horizontally between the supporting top plate and the soil, and both ends are connected to the air pump through quick connectors.

4. The pile-cutting and top-supporting enclosure structure for subway transverse connection according to claim 1 is characterized in that: The airbag is inflated with an air pressure of 0.2-0.5 MPa and is internally provided with a pressure balancing valve which automatically releases pressure when the soil pressure exceeds the limit.

5. The pile-cutting and top-supporting enclosure structure for subway transverse connection according to claim 1 is characterized in that: Traveling device: including push hydraulic cylinder and reaction seat; The pushing hydraulic cylinder is symmetrically arranged at the rear of the support system, one end of the pushing hydraulic cylinder supports the side support plate, and the other end is installed on the reaction seat.

6. The pile-cutting and top-supporting enclosure structure for subway transverse connection according to claim 1 is characterized in that: The rotary drilling tool and the pile cutting tool operate synchronously through a linkage controller. Every time the rotary drilling tool advances 1.5m, the pile cutting tool is activated to cut off the exposed existing pile foundation.

7. The pile-cutting and top-supporting enclosure structure for subway transverse connection according to claim 1 is characterized in that: The surface of the spiral blade of the rotary drilling tool is plated with a tungsten carbide coating, and the blade spacing is 200 mm.

8. A construction method for a pile-cutting and top-supporting enclosure structure for subway transverse connection according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Lay the bottom sliding shoes along the construction axis, install the support system frame accordingly, and calibrate the inclination angle of the side support plate; Step 2: Start the rotary drilling tool to excavate the soil in front. When encountering the pile of the building, cut off the existing pile foundation at the same time. Pause after advancing 1.5m, and start the walking device to push the support system forward; Step 3: Airbags are pre-installed in the supporting top plate. After a section of construction, the airbags are pressurized until the horizontal connection of the subway is completed. At this time, the airbags completely fill the space between the soil layer and the supporting top plate. The walking device is further fully advanced. At the same time, a prefabricated support corridor is constructed. The upper part is filled with grouting while the airbags are deflated.

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