Anti-disengaging and pressure-relief grouting method for secondary lining steel mould trolley top arch pouring

Abstract

The invention discloses a secondary lining steel mould trolley top arch pouring anti-disengaging and pressure relief grouting method which comprises the steps that 1, after a top formwork is erected, the top end of an inclined pipe opening of an upper pipe opening of an exhaust pipe makes contact with the inner side face of arch crown primary supporting concrete, and then the exhaust pipe below the top formwork is connected with a positioning seat through a connecting piece; 2, a driving mechanism is operated to open a concrete pouring opening, and an external pump pipe is connected with a lower pipe opening of the pouring concrete pipe through a buckle; 3, a concrete conveying pump is started, secondary lining concrete is conveyed to a secondary lining concrete pouring area through a pouring concrete pipe, when concrete grout in the exhaust pipe is filled with the concrete grout and flows out of the pipe, secondary lining concrete pouring is stopped, a lower opening of the exhaust pipe is sealed through a sealing plug, a driving mechanism is operated to close a concrete pouring opening, and an external pump pipe is dismantled; and 4, after the secondary lining concrete is solidified, the connecting piece is opened, the exhaust pipe is pulled out, and grouting is conducted at the original hole position till the gap between the secondary lining concrete pouring layer and the primary support concrete is filled. According to the invention, the disengagement phenomenon is avoided.

Description

Technical Field

[0001] The invention relates to a top arch casting of a secondary lining steel formwork trolley, in particular to a top arch casting anti-emptying and pressure relief grouting method of a secondary lining steel formwork trolley. Background Art

[0002] Steel formwork trolleys are widely used in the pouring of secondary lining concrete in tunnel construction. However, during the construction of the top arch, the problem of poor exhaust effect is often encountered. This problem is mainly manifested in that due to poor gas discharge, the top arch is prone to degassing, that is, after the second lining concrete is poured, the internal gas cannot be effectively discharged, resulting in a gap between the concrete and the formwork. In addition, in the final arch sealing stage, due to the high pressure generated by the concrete delivery pump, the residual gas is more difficult to discharge, which not only further aggravates the degassing problem, but also may cause the top arch formwork to deform due to excessive pressure, seriously affecting the stability and safety of the tunnel structure.

[0003] In addition to the exhaust problem, the secondary lining concrete also shrinks after solidification. This shrinkage will cause gaps between the outer side of the secondary lining concrete casting layer and the inner side of the primary support concrete. If these gaps are not handled in time, they may have an adverse effect on the overall structural strength and durability of the tunnel. The traditional treatment method is to fill these gaps by drilling grouting holes and then performing secondary grouting treatment, but this method is not only time-consuming and labor-intensive, but also costly and may cause certain damage to the tunnel structure. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preventing degassing and pressure relief grouting of a top arch of a secondary lining steel formwork trolley, which effectively solves the problem of degassing in the top arch and reduces the construction cost of secondary grouting to fill the gap.

[0005] To achieve the above purpose, the present invention can adopt the following technical solutions: The method for anti-cavitation and pressure relief grouting of the top arch of the secondary lining steel formwork platform described in the present invention adopts a special device for grouting construction; The special device comprises an exhaust pipe which is vertically and upwardly sealed and penetrates the top formwork, and the upper pipe opening of the exhaust pipe is an oblique pipe opening structure; a concrete pouring port is provided on the top formwork, and a movable cover plate is provided at the concrete pouring port, and the movable cover plate is slidably provided on the upper surface of the top formwork; a pouring concrete pipe is fixed on one side of the exhaust pipe on the lower surface of the top formwork, and the upper pipe opening of the pouring concrete pipe is fixedly connected with the concrete pouring port; a support plate and a positioning seat are fixed on the outer wall of the pouring concrete pipe, and a driving mechanism for opening / closing the concrete pouring port is provided on the support plate, and the positioning seat is connected to the exhaust pipe located below the top formwork through a connecting piece; The pouring method comprises the following steps: Step 1, after the top formwork is erected, the top of the inclined pipe opening of the exhaust pipe is brought into contact with the inner side of the primary support concrete of the arch, and then the exhaust pipe under the top formwork is connected to the positioning seat through the connecting piece; Step 2, operating the driving mechanism to open the concrete pouring port, and connecting the external pump pipe to the lower pipe port of the pouring concrete pipe through a buckle; Step 3, start the concrete delivery pump, and deliver the second lining concrete to the second lining concrete pouring area through the pouring concrete pipe, and at the same time start the attached vibrator set on the lower plate surface of the top template for vibration. As the second lining concrete surface gradually rises, the gas in the second lining concrete pouring area is discharged from the oblique pipe port of the exhaust pipe; when the second lining concrete surface rises to the top arch surface, part of the concrete slurry enters the exhaust pipe through the oblique pipe port and flows out from the lower pipe port of the exhaust pipe; when the concrete slurry in the exhaust pipe is full of the pipe and flows out, stop pouring the second lining concrete, seal the lower port of the exhaust pipe with a sealing plug, operate the driving mechanism to close the concrete pouring port, and remove the external pump pipe; Step 4: After the secondary lining concrete solidifies, open the connector to pull out the exhaust pipe, and grout the original hole until the gap between the secondary lining concrete pouring layer and the primary support concrete is filled.

[0006] Optionally, the driving mechanism includes a rotating shaft hinged on the supporting plate, the rotating shaft vertically passes through the top mold plate and is fixedly connected to the movable cover plate, and a handle is fixed to the lower end of the rotating shaft.

[0007] Optionally, the connecting piece is a movable buckle, and the positioning seat is connected to the exhaust pipe located below the top mold plate via the movable buckle.

[0008] Optionally, a sealing plate is mounted on the exhaust pipe below the top mold plate through a sealing ring sleeve, and the upper plate surface of the sealing plate is in close contact with the lower plate surface of the top mold plate.

[0009] Optionally, in order to facilitate the removal of the exhaust pipe from the solidified secondary lining concrete, a preservative film is coated on the outer surface of the exhaust pipe.

[0010] The present invention adds an exhaust pipe with an oblique pipe opening on the side of the pouring concrete pipe. Therefore, during the concrete pouring period, the gas in the second lining concrete pouring area is discharged from the oblique pipe opening of the exhaust pipe, which plays a key role in exhaust and pressure relief and avoids the occurrence of emptying. At the same time, when the second lining concrete is poured to the top of the arch sealing stage, when the slurry is fully discharged from the exhaust pipe, it can be intuitively judged that the pouring is in place, thereby improving the construction efficiency and accuracy. In addition, when the second phase concrete is solidified, grouting materials can be injected through the holes of the exhaust pipe to effectively fill the gap between the second lining concrete pouring layer and the primary support concrete, without the need for additional drilling and grouting hole operations. This not only simplifies the construction process and reduces construction costs, but also improves the integrity and durability of the tunnel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the special device described in the present invention.

[0012] Figure 2 yes Figure 1 Schematic diagram of the AA section structure.

[0013] Figure 3 It is a schematic diagram of the concrete pouring port of the present invention in an open state.

[0014] Figure 4 It is a schematic diagram of the concrete pouring port in the closed state according to the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0017] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In addition, the meaning of "and / or" appearing in the full text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0019] like Figure 1-4As shown, the method for anti-emptying and pressure relief grouting of the top arch of the secondary lining steel formwork trolley described in the present invention adopts a special device for grouting construction; The special device includes an exhaust pipe 2 made of PVC material that vertically and upwardly seals and penetrates the top formwork 1, and the upper pipe opening of the exhaust pipe 2 is a downwardly inclined oblique pipe opening structure; a concrete pouring port 3 is opened on the top formwork 1, and a movable cover plate 4 is arranged at the concrete pouring port 3, and the movable cover plate 4 is slidably arranged on the upper plate surface of the top formwork 1; a pouring concrete pipe 5 is welded on one side of the exhaust pipe 2 on the lower plate surface of the top formwork 1, and the upper pipe opening of the pouring concrete pipe 5 is fixedly connected and communicated with the concrete pouring port 3; a support plate 6 and a positioning seat 7 are fixed on the outer wall of the pouring concrete pipe 5, and a driving mechanism for opening / closing the concrete pouring port is arranged on the support plate 6, and the positioning seat 7 is connected to the exhaust pipe 2 located below the top formwork 1 through a connecting piece.

[0020] Beneficially or exemplarily, the driving mechanism includes a rotating shaft 8 hinged on the support plate 6, which passes through the top template 1 vertically upward and is fixedly connected to the movable cover plate 4. A handle 9 is fixed to the lower end of the rotating shaft 8 to facilitate the operation of the movable cover plate 4 to open\close the concrete pouring port.

[0021] Beneficially or exemplarily, the connecting member is a movable clip 10; one end of the movable clip is screwed to the positioning seat 7 by a bolt, and the other end is connected to the positioning seat 7 by a pin shaft and a cotter pin. The exhaust pipe 2 located below the top mold plate 1 is detachably connected to the positioning seat 7 through the movable clip 10.

[0022] Advantageously or illustratively, a sealing plate 12 is mounted on the exhaust pipe 2 below the top formwork 1 through a sealing ring 11, and the upper surface of the sealing plate 12 is in close contact with the lower surface of the top formwork 1 to prevent slurry from flowing out of the gap between the top formwork 1 and the outer wall of the exhaust pipe 2 during the second phase of concrete pouring.

[0023] Advantageously or exemplarily, the outer surface of the exhaust pipe 2 is covered with a plastic wrap, which facilitates the exhaust pipe 2 to be pulled out from the solidified second-stage concrete.

[0024] The grouting method comprises the following steps: Step 1, after the top formwork 1 is erected, the top of the inclined pipe opening of the exhaust pipe 2 is brought into contact with the inner side of the primary support concrete 13 of the arch and tightened, and then the exhaust pipe 2 under the top formwork 1 is connected and positioned with the positioning seat 7 through the movable buckle 10; Step 2: Use the handle 9 to operate the movable cover plate 4 to open the concrete pouring port 3 (such as Figure 3 As shown), connect the external pump pipe (not shown in the figure) to the lower pipe opening of the pouring concrete pipe 5 through a buckle; Step 3, start the concrete delivery pump, and deliver the secondary lining concrete to the secondary lining concrete pouring area (the area between the primary support concrete 13 of the arch and the top formwork 1) through the pouring concrete pipe 5, and at the same time start the attached vibrator 14 arranged on the lower plate surface of the top formwork 1 for vibration; as the injected secondary lining concrete surface gradually rises, the gas in the secondary lining concrete pouring area is gradually discharged from the oblique pipe opening of the exhaust pipe 2; when the poured secondary lining concrete surface rises to the top arch surface, part of the concrete slurry enters the exhaust pipe 2 through the oblique pipe opening and flows out from the lower pipe opening of the exhaust pipe; when the concrete slurry in the exhaust pipe 2 fills the pipe and flows out, stop pouring the secondary lining concrete, seal the exhaust pipe 2 opening with the sealing plug 15, and operate the movable cover plate 4 with the handle 9 to close the concrete pouring opening 3 (such as Figure 4 As shown), remove the external pump tube; Step 4, after the secondary lining concrete solidifies, open the movable buckle 10 to pull out the exhaust pipe 2, and grouting is performed at the original hole position until the gap between the secondary lining concrete pouring layer and the arch primary support concrete 13 is filled, and the grouting construction is completed.

Claims

1. A method for anti-emptying and pressure relief grouting of a top arch of a secondary lining steel formwork trolley, characterized in that: Use special equipment for grouting construction; The special device comprises an exhaust pipe which is vertically and upwardly sealed and penetrates the top formwork, and the upper pipe opening of the exhaust pipe is an oblique pipe opening structure; a concrete pouring port is provided on the top formwork, and a movable cover plate is provided at the concrete pouring port, and the movable cover plate is slidably provided on the upper surface of the top formwork; a pouring concrete pipe is fixed on one side of the exhaust pipe on the lower surface of the top formwork, and the upper pipe opening of the pouring concrete pipe is fixedly connected with the concrete pouring port; a support plate and a positioning seat are fixed on the outer wall of the pouring concrete pipe, and a driving mechanism for opening / closing the concrete pouring port is provided on the support plate, and the positioning seat is connected to the exhaust pipe located below the top formwork through a connecting piece; The grouting method comprises the following steps: Step 1, after the top formwork is erected, the top of the inclined pipe opening of the exhaust pipe is brought into contact with the inner side of the primary support concrete of the arch, and then the exhaust pipe under the top formwork is connected to the positioning seat through the connecting piece; Step 2, operating the driving mechanism to open the concrete pouring port, and connecting the external pump pipe to the lower pipe port of the pouring concrete pipe through a buckle; Step 3, start the concrete delivery pump, and deliver the second lining concrete to the second lining concrete pouring area through the pouring concrete pipe, and at the same time start the attached vibrator set on the lower plate surface of the top template for vibration. As the second lining concrete surface gradually rises, the gas in the second lining concrete pouring area is discharged from the oblique pipe port of the exhaust pipe; when the second lining concrete surface rises to the top arch surface, part of the concrete slurry enters the exhaust pipe through the oblique pipe port and flows out from the lower pipe port of the exhaust pipe; when the concrete slurry in the exhaust pipe is full of the pipe and flows out, stop the second lining concrete pouring, seal the lower port of the exhaust pipe with a sealing plug, operate the driving mechanism to close the concrete pouring port, and remove the external pump pipe; Step 4: After the secondary lining concrete solidifies, open the connector to pull out the exhaust pipe, and grout the original hole until the gap between the secondary lining concrete pouring layer and the primary support concrete is filled.

2. The method for anti-emptying and pressure relief grouting of the top arch of the secondary lining steel formwork trolley according to claim 1 is characterized by: The driving mechanism comprises a rotating shaft hinged on the supporting plate, the rotating shaft passes through the top mold plate vertically upward and is fixedly connected to the movable cover plate, and a handle is fixed to the lower end of the rotating shaft.

3. The method for anti-cavitation and pressure relief grouting of the top arch casting of the secondary lining steel formwork trolley according to claim 1 or 2 is characterized in that: The connecting piece is a movable buckle, and the positioning seat is connected to the exhaust pipe located below the top mold plate through the movable buckle.

4. The method for anti-cavitation and pressure relief grouting of the top arch casting of the secondary lining steel formwork trolley according to claim 1 or 2 is characterized in that: A sealing plate is sleeved on the exhaust pipe below the top mold plate through a sealing ring, and the upper plate surface of the sealing plate is in close contact with the lower plate surface of the top mold plate.

5. The method for anti-cavitation and pressure relief grouting of the top arch casting of the secondary lining steel formwork trolley according to claim 1 or 2 is characterized by: The outer surface of the exhaust pipe is covered with a preservative film.

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