Small-diameter shield split launching method for narrow rectangular vertical shaft

Abstract

The invention discloses a small-diameter shield split launching method for a narrow rectangular vertical shaft, and relates to the technical field of shield tunneling machines. Step 2, placing in a split manner; step 3, carrying out split tunneling; and 4, tunneling the whole machine. Wherein in the second step, the later-assembled trolley section in the vertical shaft comprises an operation control room and a later-assembled trolley section in front of a belt soil outlet, and after the split body is tunneled by a preset distance, the later-assembled trolley on the ground is hoisted to the shaft for complete machine tunneling. According to the shield tunneling machine starting method, the construction efficiency is effectively ensured, the construction period is shortened, meanwhile, the equipment failure rate is reduced, and the equipment maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of shield machines, in particular to a method for starting a small-diameter shield machine in a narrow rectangular shaft. Background Art

[0002] Small-diameter shield tunnels are mostly used in various municipal pipe corridors. Compared with subway shield tunnels and stations, small shield tunnels have a small cross-sectional area, and the shield machine used during construction is long. The length of the small-diameter shield machine is basically between 110 and 130 meters, and the number of trolleys is 17 to 18. Secondly, the shafts built for municipal engineering are generally only used for the inspection and maintenance of pipe corridor tunnels in the later stage. The smaller the shaft size, the more conducive it is to reduce waste. The smaller-scale structure of the shaft and the longer mechanical equipment have led to the current two modes of small-diameter shield tunneling in municipal pipe corridors.

[0003] The first mode is initiated by the whole machine, such as Figure 1-2 As shown in the figure, the whole machine starts by hoisting the shield machine mainframe and the supporting trolley connected to it at the bottom of the shaft, and then the whole machine is connected and debugged before excavation. The length of the shaft to be built in this starting mode needs to be greater than the length of the shield machine. The construction of the shaft occupies a large area. Generally, the length of the shaft is 120m, with high investment and construction costs, high risks, and low utilization rate of the shaft in the later stage, resulting in waste of resources. The advantage is that this mode has high initial excavation efficiency.

[0004] The second mode is initiated by a large split, such as Figure 3-4 As shown in the figure, the shield machine mainframe and the operation control room (usually the first trolley) are usually placed at the bottom of the shaft during the large-scale split start, and the remaining supporting trolleys are all placed on the ground. The shield machine mainframe and the supporting trolleys are connected by an extension pipeline; the area of ​​the shaft is small, and the length of the shaft is generally 8m. After the start, the shield machine mainframe advances forward. When the excavation length meets the length of all supporting trolleys, all the trolleys placed on the ground are hoisted down to the shaft and connected to the shield machine mainframe in the tunnel. In this start-up plan, since all the supporting trolleys of the shield machine are placed on the ground, the slag conveying equipment of the shield machine trolley section is separated from the mainframe. Therefore, in order to complete a cycle of excavation during the start-up period, a small slag bucket is required to carry out multiple vertical and horizontal transportation at the wellhead and in the tunnel, which seriously delays time, resulting in extremely low excavation efficiency, delayed construction period, and increased management costs. In addition, since the shield machine and the supporting trolleys are largely separated, the extension pipeline is very easy to wear, the equipment failure rate is high, and the equipment maintenance cost is high. The advantage is that there is no need to build a large vertical shaft, the vertical shaft occupies a small area and the investment cost is low.

[0005] Therefore, how to combine the advantages of the two starting methods and provide a method for split starting of small-diameter shield machines in narrow rectangular shafts, so as to improve the construction efficiency of small-diameter shield starting and shorten the construction period while reducing the equipment failure rate and equipment maintenance costs, has become a difficult problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0006] The purpose of the present invention is to provide a method for launching a small-diameter shield machine in a narrow rectangular shaft, so as to solve the problem that the existing method for launching a small-diameter shield machine in a rectangular shaft cannot take into account both construction efficiency and equipment failure rate.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The method for starting a small-diameter shield machine in a narrow rectangular shaft comprises the following steps:

[0009] Step 1: Dig a rectangular shaft: measure the distance between the shield machine cutter head and the belt exit of the rear trolley, mark it as d, and dig a rectangular shaft according to the distance d;

[0010] Step 2: Split placement: Place the shield machine and the first rear trolley section before the belt excavation port at the bottom of the shaft excavated in step 1 and connect them, and place the second rear trolley section after the belt excavation port on the ground beside the shaft and connect them in sequence; the first rear trolley section and the second rear trolley section are connected by an extension pipeline;

[0011] Step 3: Split excavation: The shield machine in the shaft excavates forward together with the first rear supporting trolley section connected thereto, and the excavation distance is the total length of the second rear supporting trolley section on the ground beside the shaft; after the split excavation is completed, the slag stored in the first rear supporting trolley section in the shaft is transported to the outside of the shaft;

[0012] Step 4: whole-machine excavation: the remaining multiple rear-end trolleys of the second rear-end trolley section on the ground are hoisted into the well at one time, and the pipelines are connected between them and the first rear-end trolley section in the shaft, and then the shield machine is changed to whole-machine excavation.

[0013] Preferably, in step one, the length d of the shaft is set to 42-60 m.

[0014] Preferably, the end of the last rear-end trolley preferably inside the shaft and the front end of the first rear-end trolley preferably outside the shaft are preferably connected via an extension pipeline.

[0015] Preferably, the rear-mounted trolley of the first rear-mounted trolley section has seven or eight sections; the rear-mounted trolley of the first rear-mounted trolley section has nine or eleven sections.

[0016] Preferably, all mechanical equipment needs to be debugged before performing separate excavation or whole-machine excavation, and the shield machine preferably performs initial excavation and excavation after the performance of the mechanical equipment is stabilized.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] The present invention discloses a method for starting a small-diameter shield machine in a narrow rectangular shaft, comprising the steps of: first, digging a rectangular shaft; second, placing the machine in a split manner; third, driving the machine in a split manner; and fourth, driving the machine in a whole manner. In step 2, the rear-end trolley segment in the shaft includes an operation control room and a rear-end trolley segment in front of a belt excavation port. After the machine has driven the machine in a predetermined distance, the rear-end trolley on the ground is hoisted down the shaft for driving the machine in a whole manner.

[0019] (1) The small-diameter shield machine adopts this starting mode to effectively improve the excavation efficiency of the shield split starting mode. Compared with the large split starting mode, this method can improve the efficiency by at least 4 times.

[0020] (2) The use of this starting scheme can reduce the duration of danger when the shield machine starts, reduce risks, ensure the safety of the shield machine start-up, and ensure the construction quality. At the same time, it reduces the equipment failure rate caused by the large separation of the shield machine and controls the maintenance investment.

[0021] (3) Compared with the construction of a large-scale vertical shaft for overall construction, this scheme effectively reduces the scale of the vertical shaft, significantly reduces the project investment, reduces the area of ​​land occupied by the vertical shaft construction, significantly reduces the construction risk, and shortens the construction period of the vertical shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 This is the top view of the whole machine;

[0024] Figure 2 This is the side sectional view of the whole machine;

[0025] Figure 3 This is the top view of the origin of the large body;

[0026] Figure 4 This is a side sectional view of the origin of the large body;

[0027] Figure 5 It is a top view of the starting point of the small-diameter shield machine split in a narrow rectangular shaft of the present invention;

[0028] Figure 6 It is a side sectional view of the starting point of the small-diameter shield split in a narrow rectangular vertical shaft of the present invention.

[0029] Explanation of the accompanying reference numerals: 1. Vertical shaft; 2. Shield machine; 3. Rear supporting trolley; 4. Extension pipeline. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by 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 used to limit the present invention.

[0031] like Figure 5-6 As shown, a method for starting a small-diameter shield machine in a narrow rectangular shaft comprises the following steps:

[0032] Step 1: dig a rectangular shaft: measure the distance between the cutter head of the shield machine and the belt exit of the rear trolley, mark it as d, and dig a rectangular shaft 1 according to the distance d;

[0033] Specifically, after the rectangular shaft 1 is excavated, it is necessary to carry out preparation work on all upper and lower working surfaces of the shaft 1, and then carry out on-site acceptance work for the shield machine 2.

[0034] Step 2: Split placement: Place the shield machine 2 and the first rear-mounted trolley section before the belt excavation port at the bottom of the shaft 1 excavated in step 1 and connect them, and place the second rear-mounted trolley section after the belt excavation port on the ground beside the shaft 1 and connect them in sequence; the first rear-mounted trolley section and the second rear-mounted trolley section are connected via an extension pipeline 4;

[0035] The length of a small-diameter shield machine is generally between 110 and 130 meters, and the number of rear-mounted trolleys 3 is about 17 to 18 sections. When the shield machine 2 is excavating normally, the belt exit is generally located at the seventh or eighth section of the rear-mounted trolley. Therefore, in the specific implementation, the shield machine 2 and the first to seventh or eighth sections of the rear-mounted trolleys are generally hoisted into the shaft 1 as a whole and connected to form a whole. The remaining eighth to eighteenth sections of the rear-mounted trolleys are installed on the ground near the shaft 1 at pre-determined positions, placed section by section, and connected and fixed.

[0036] Step 3: Split excavation: The shield machine 2 in the shaft 1 excavates forward together with the first rear supporting trolley section connected thereto, and the excavation distance is the total length of the second rear supporting trolley section on the ground beside the shaft 1; after the split excavation is completed, the slag stored in the first rear supporting trolley section in the shaft 1 is transported to the outside of the shaft 1;

[0037] Step 4: whole-machine excavation: the remaining multiple rear-end trolleys 3 of the second rear-end trolley section on the ground are hoisted into the well at one time, and the pipelines are connected to the first rear-end trolley section in the shaft 1. After that, the shield machine 2 is changed to whole-machine excavation.

[0038] Specifically, in step 1, the length d of the shaft is set to 42-60m.

[0039] Specifically, the end of the last rear-end trolley 3 in the shaft 1 and the front end of the first rear-end trolley 3 outside the shaft 1 are connected via an extension pipeline 4 .

[0040] Specifically, the number of sections of the rear-mounted trolley 3 of the first rear-mounted trolley section is seven or eight; the number of sections of the rear-mounted trolley 3 of the first rear-mounted trolley section is nine or eleven.

[0041] Specifically, before performing the separate tunneling or the whole machine tunneling, all mechanical equipment needs to be debugged, and after the performance of the mechanical equipment is stabilized, the shield machine 2 starts the tunneling operation.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for launching a small-diameter shield machine in a narrow rectangular shaft, characterized in that: The following steps are involved: Step 1, digging a rectangular shaft: measuring the distance between the shield machine cutter head and the belt exit of the rear trolley, marked as d, and digging a rectangular shaft according to the distance d (1); Step 2, separate placement: the shield machine (2) and the first rear-end trolley section before the belt excavation port are placed at the bottom of the vertical shaft (1) excavated in step 1 and connected, and the second rear-end trolley section after the belt excavation port is placed on the ground beside the vertical shaft (1) and connected in sequence; the first rear-end trolley section and the second rear-end trolley section are connected via an extension pipeline (4); Step 3: Split excavation: the shield machine (2) in the vertical shaft (1) excavates forward together with the first rear supporting trolley section connected thereto, and the excavation distance is the total length of the second rear supporting trolley section on the ground beside the vertical shaft (1); after the split excavation is completed, the slag stored in the first rear supporting trolley section in the vertical shaft (1) is transported to the outside of the vertical shaft (1); Step 4: whole-machine excavation: the remaining multiple rear-end trolleys (3) of the second rear-end trolley section on the ground are hoisted into the well at one time, and the pipelines are connected to the first rear-end trolley section in the vertical shaft (1). After that, the shield machine (2) is changed to whole-machine excavation.

2. The method for launching a small-diameter shield in a narrow rectangular shaft according to claim 1, characterized in that: Step 1: The length d of the shaft is set to 42-60m.

3. The method for launching a small-diameter shield in a narrow rectangular shaft according to claim 1, characterized in that: The end of the last rear-end trolley (3) in the vertical shaft (1) and the front end of the first rear-end trolley (3) outside the vertical shaft (1) are connected via an extension pipeline (4).

4. The method for launching a small-diameter shield machine in a narrow rectangular shaft according to claim 1, characterized in that: The number of sections of the rear-mounted trolley (3) of the first rear-mounted trolley section is seven or eight; the number of sections of the rear-mounted trolley (3) of the first rear-mounted trolley section is nine or eleven.

5. The method for launching a small-diameter shield machine in a narrow rectangular shaft according to claim 1, characterized in that: Before carrying out separate excavation or whole-machine excavation, all mechanical equipment needs to be debugged. After the performance of the mechanical equipment is stabilized, the shield machine (2) starts excavation and excavation.

Images