Method for using shield tunnel portal cutting device

Abstract

The invention discloses a method for using a shield tunnel portal cutting device, comprising a rotating shaft bracket, a rotating rod, a main gun head of a high-pressure jet water gun, a secondary gun head of a high-pressure jet water gun, a lifting ring, a pressurizing device, and a control device; first, the lifting ring is pre-buried in advance on a steel cage body of a retaining structure at the portal through a 260t crawler crane; second, the rotating shaft bracket is fixed to a bottom plate of a middle and lower structure of a station near a steel ring of the portal, so that its rotating shaft is aligned with the center position of the steel ring; third, the main gun head of the high-pressure jet water gun and the secondary gun head of the high-pressure jet water gun are adjusted to a spacing of 10 cm, so that the water lines ejected from the two form an angle of 18°; fourth, the main gun head of the high-pressure jet water gun and the secondary gun head of the high-pressure jet water gun are turned on and the injection pressure value is set through the control device, the external rotating device drives the rotating rod to rotate, and the main gun head of the high-pressure jet water gun and the secondary gun head of the high-pressure jet water gun circulate along the steel ring position at a certain speed to cut the retaining structure concrete.

Description

Technical Field

[0001] The invention relates to the technical field of shield construction, and in particular to a method for using a shield tunnel portal cutting device. Background Art

[0002] When underground continuous wall or bored cast-in-place pile retaining structure is used, although it can bring good effect to station construction, the retaining structure at the portal must be chiseled out during the shield starting or receiving process to achieve the normal excavation stage. At present, the conventional chiseling method of manual portal chiseling is often used in China to achieve this goal. However, the traditional method of breaking the portal of the shield tunnel takes a long time, consumes time, and the construction team has expensive contracting fees. On the other hand, manual operation has great safety hazards. The portal broken by this method is limited by the above reasons, which greatly affects the subsequent construction progress. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a method for using a shield tunnel portal cutting device.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0005] A method for using a shield tunnel portal cutting device comprises a shield tunnel portal cutting device, wherein the shield tunnel portal cutting device comprises a rotating shaft bracket, a rotating rod, a main gun head of a high-pressure jet flow water gun, a secondary gun head of a high-pressure jet flow water gun, a lifting ring, a pressurizing device, and a control device; the rotating rod is rotatably connected to the rotating shaft bracket, one end of the rotating rod is vertically bent, and the gun bodies of the main gun head of the high-pressure jet flow water gun and the secondary gun head of the high-pressure jet flow water gun are fixedly connected to the vertically bent end of the rotating rod; the main gun head of the high-pressure jet flow water gun and the secondary gun head of the high-pressure jet flow water gun are connected to the pressurizing device, and the control device is connected to the pressurizing device, comprising the following steps:

[0006] 1. Pre-embed the lifting ring on the steel cage of the enclosure structure at the tunnel entrance through a crawler crane of 260t or above;

[0007] 2. Fix the rotating shaft bracket on the bottom plate of the lower structure of the station near the tunnel gate steel ring so that the rotating shaft is aligned with the center position of the steel ring;

[0008] 3. Adjust the main gun head and the auxiliary gun head of the high-pressure jet water gun to a distance of 10 cm, and the water lines ejected from the main gun head and the auxiliary gun head of the high-pressure jet water gun form an angle of 18°;

[0009] Fourth, the main gun head and the auxiliary gun head of the high-pressure jet flow water gun are turned on and the jet pressure value is set through the control device. The external rotating device drives the rotating rod to rotate, and the rotating rod drives the main gun head and the auxiliary gun head of the high-pressure jet flow water gun to rotate along the rotating shaft of the rotating rod. The main gun head and the auxiliary gun head of the high-pressure jet flow water gun circulate along the position of the steel ring at a certain speed to cut the concrete of the retaining structure. The cutting depth of the tunnel is controlled at 60cm, and the width of the tunnel ground-connected wall is 80cm;

[0010] 5. According to the cutting efficiency of the main gun head and the auxiliary gun head of the high-pressure jet water gun, choose to cut in two times. The first time is to cut the 1 / 4 arc of the upper part of the tunnel portal. After the initial cutting of the concrete within the 1 / 4 arc range is completed, readjust the main gun head and the auxiliary gun head of the high-pressure jet water gun to carry out deeper cutting on this basis until the cutting depth reaches 60cm or more. To cut the remaining 3 / 4 arc of concrete, first use a crawler crane to pass the wire rope through the embedded lifting ring to suspend and fix the tunnel portal face to prevent the concrete from being cut without safety measures. Then the cutting is divided into two times, and the cutting method is the same as the 1 / 4 arc concrete cutting method.

[0011] Compared with the prior art, the advantages of the present invention are: the present invention improves the original manual chiseling into mechanical cutting, thereby improving construction safety, greatly shortening the construction period, reducing expenses, accelerating the construction period, and the whole after cutting can be reused, with better overall improvement effect. Manual chiseling will generate concrete dust and make loud chiseling noise, while the water gun cutting sound is soft, achieving the function of dust reduction and noise reduction, and the jet of water can automatically reduce dust, which meets the requirements of civilized and environmentally friendly construction sites and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a stereoscopic diagram of the shield tunnel portal cutting device of the present invention when in use.

[0013] Figure 2 It is a front view of the shield tunnel portal cutting device in the present invention when in use.

[0014] Figure 3 yes Figure 2 Sectional view at AA.

[0015] As shown in the figure: 1. rotating shaft bracket, 2. rotating rod, 3. main gun head of high-pressure jet water gun, 4. auxiliary gun head of high-pressure jet water gun, 5. lifting ring, 6. boosting device, 7. control device. DETAILED DESCRIPTION

[0016] The following is a further detailed description of the method for using the shield tunnel portal cutting device of the present invention in conjunction with the accompanying drawings.

[0017] Combined with Figure 1-3A method for using a shield tunnel portal cutting device, comprising a shield tunnel portal cutting device, the shield tunnel portal cutting device comprising a rotating shaft bracket 1, a rotating rod 2, a main gun head 3 of a high-pressure jet stream water gun, a secondary gun head 4 of a high-pressure jet stream water gun, a lifting ring 5, a booster device 6, and a control device 7; the rotating rod 2 is rotatably connected to the rotating shaft bracket 1, one end of the rotating rod 2 is vertically bent, and the gun bodies of the main gun head 3 of the high-pressure jet stream water gun and the secondary gun head 4 of the high-pressure jet stream water gun are fixedly connected to the vertically bent end of the rotating rod 2; the main gun head 3 of the high-pressure jet stream water gun and the secondary gun head 4 of the high-pressure jet stream water gun are connected to the booster device 6, and the control device 7 is connected to the booster device 6, comprising the following steps:

[0018] 1. Pre-embed the lifting ring 5 in the steel cage of the enclosure structure at the tunnel entrance by using a crawler crane of 260t or above;

[0019] 2. Fix the rotating shaft bracket 1 on the bottom plate of the lower structure of the station near the tunnel gate steel ring so that its rotating shaft is aligned with the center position of the steel ring;

[0020] 3. Adjust the main gun head 3 and the auxiliary gun head 4 of the high-pressure jet stream water gun to a distance of 10 cm, and the water lines ejected from the main gun head 3 and the auxiliary gun head 4 of the high-pressure jet stream water gun form an angle of 18°;

[0021] Fourth, the main gun head 3 and the auxiliary gun head 4 of the high-pressure jet flow water gun are turned on and the jet pressure value is set by the control device 7, the external rotating device drives the rotating rod 2 to rotate, and the rotating rod 2 drives the main gun head 3 and the auxiliary gun head 4 of the high-pressure jet flow water gun to rotate along the rotating shaft of the rotating rod 2, and the main gun head 3 and the auxiliary gun head 4 of the high-pressure jet flow water gun circulate along the position of the steel ring at a certain speed to cut the concrete of the retaining structure, and the cutting depth of the tunnel is controlled at 60cm, and the width of the tunnel ground-connected wall is 80cm;

[0022] 5. According to the cutting efficiency of the main gun head 3 and the auxiliary gun head 4 of the high-pressure jet water gun, choose to cut in two times. The first time is to cut the 1 / 4 arc of the upper part of the tunnel portal. After the initial cutting of the concrete within the 1 / 4 arc range is completed, the main gun head 3 and the auxiliary gun head 4 of the high-pressure jet water gun are readjusted on this basis to perform in-depth cutting until the cutting depth reaches 60 cm or more. To cut the remaining 3 / 4 arc of concrete, first use a crawler crane to pass the wire rope through the embedded lifting ring 5 to suspend and fix the tunnel portal face to prevent the concrete from being cut without safety measures. After that, the cutting is divided into two times, and the cutting method is the same as the 1 / 4 arc concrete cutting method.

[0023] The present invention improves the original manual chiseling into mechanical cutting, thus improving construction safety, greatly shortening the construction period, reducing expenses, speeding up the construction period, and reusing the entire structure after cutting, thus achieving better overall improvement effect. Manual chiseling will generate concrete dust and make loud chiseling noise, while the water gun cutting sound is soft, thus achieving the functions of dust reduction and noise reduction, and the spraying of water flow can automatically reduce dust, thus meeting the requirements of civilized and environmentally friendly construction sites and having good practicality.

[0024] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A method for using a shield tunnel portal cutting device, comprising a shield tunnel portal cutting device, the shield tunnel portal cutting device comprising a rotating shaft bracket (1), a rotating rod (2), a main gun head (3) of a high-pressure jet water gun, a secondary gun head (4) of a high-pressure jet water gun, a lifting ring (5), a pressurizing device (6), and a control device (7); the rotating rod (2) is rotatably connected to the rotating shaft bracket (1), one end of the rotating rod (2) is vertically bent, and the gun bodies of the main gun head (3) of the high-pressure jet water gun and the secondary gun head (4) of the high-pressure jet water gun are fixedly connected to the vertically bent end of the rotating rod (2); the main gun head (3) of the high-pressure jet water gun and the secondary gun head (4) of the high-pressure jet water gun are connected to the pressurizing device (6), and the control device (7) is connected to the pressurizing device (6), characterized in that The following steps are involved:

1. Pre-embed the lifting ring (5) in the steel cage of the enclosure structure at the tunnel entrance by using a crawler crane of 260t or above; 2. Fix the rotating shaft bracket (1) on the bottom plate of the lower structure of the station near the tunnel gate steel ring so that the rotating shaft is aligned with the center position of the steel ring; 3. The main gun head (3) and the auxiliary gun head (4) of the high-pressure jet water gun are adjusted to a distance of 10 cm, and the water lines ejected from the main gun head (3) and the auxiliary gun head (4) of the high-pressure jet water gun form an angle of 18°; Fourth, the main gun head (3) and the auxiliary gun head (4) of the high-pressure jet water gun are turned on and the jet pressure value is set by the control device (7), the external rotating device drives the rotating rod (2) to rotate, and the rotating rod (2) drives the main gun head (3) and the auxiliary gun head (4) of the high-pressure jet water gun to rotate along the rotating shaft of the rotating rod (2), and the main gun head (3) and the auxiliary gun head (4) of the high-pressure jet water gun circulate along the position of the steel ring at a certain speed to cut the concrete of the enclosure structure, and the cutting depth of the tunnel is controlled to be 60 cm, and the width of the tunnel ground connection wall is 80 cm; 5. According to the cutting efficiency of the main gun head (3) and the auxiliary gun head (4) of the high-pressure jet water gun, the cutting is carried out in two times. The first time, the 1 / 4 arc of the upper part of the tunnel portal is cut. After the concrete within the 1 / 4 arc is cut for the first time, the main gun head (3) and the auxiliary gun head (4) of the high-pressure jet water gun are readjusted to carry out deeper cutting until the cutting depth reaches 60 cm or more. To cut the remaining 3 / 4 arc of concrete, the crawler crane is first used to pass the steel wire rope through the embedded lifting ring (5) to suspend and fix the tunnel portal face to prevent the concrete from being cut without safety measures. After that, the cutting is carried out in two times. The cutting method is the same as the 1 / 4 arc concrete cutting method.

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