Tunnel secondary lining top arch anti-disengaging construction device and construction method

Abstract

The invention discloses a tunnel secondary lining top arch anti-disengaging construction device and a construction method, and relates to the technical field of tunnel secondary lining construction, the tunnel secondary lining top arch anti-disengaging construction device comprises an outer sleeve fitting, the upper end opening of the outer sleeve fitting is used for feeding concrete slurry into a bin, and the side face of the outer sleeve fitting is provided with a connecting port; one end of the branch pipe is connected with the connector, and the other end of the branch pipe is used for conveying concrete slurry to the outer sleeve after being connected with a pumping pipe of the concrete slurry; the piston is arranged in the outer sleeve fitting, the bottom of the piston is connected with a driving rod, and the driving rod penetrates through the bottom of the outer sleeve fitting and extends outwards; wherein the side face of the outer sleeve pipe fitting is provided with at least one extrusion piece, the inner side wall of the extrusion piece sinks inwards or is flush relative to the inner side wall of the outer sleeve pipe fitting, and the extrusion piece is made of elastic materials. The extrusion part is arranged on the side face of the outer sleeve part, so that the aim of avoiding the phenomenon that concrete is difficult to push by the grout stopping piston during tunnel secondary lining top arch construction is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel secondary lining construction, and particularly relates to a construction device and a construction method for preventing the top arch of a tunnel secondary lining from being voided. Background Art

[0002] In the construction of tunnel projects, the construction quality of the top arch of the secondary lining is of crucial importance. In traditional top arch concrete placement, vertical pumping or manual plugging is used. It is easy to cause cavities in the top arch due to insufficient concrete fluidity or inadequate vibration, which affects the structural stability and durability of the tunnel. Moreover, the plugging time at the concrete placement opening is long, and it is easy to have offsets, resulting in poor appearance quality of the secondary lining. At the same time, a large number of operators are required during the construction process, and the construction efficiency is low.

[0003] Patent CN206503606U provides a spiral-pushing type concrete pumping pipe orifice plugging device. The device includes a hollow sleeve. A grout stopping piston is arranged inside the sleeve, and a push rod is connected to the lower part of the grout stopping piston. The top of the sleeve is connected with a steel formwork with a through hole in the center. A concrete pumping inlet pipe is also connected to the side of the upper part of the sleeve, and the concrete pumping inlet pipe is connected to the sleeve in a mutually penetrating manner. Through the above structure, the concrete placement opening can be plugged quickly, and the plugging time can be shortened. By the plugging method of pushing the grout stopping piston with a spiral push rod, the concrete inside the pump pipe is strongly pressed into the bin, improving the effect of fullness and density of the concrete at the inlet of the bin, solving the problem of concrete backflow in the bin after removing the pump pipe, and reducing the difficulty of plugging the concrete placement opening.

[0004] However, when applying this device to the construction of the top arch of a tunnel secondary lining, in order to fully plug the bin opening, the installation direction of the device is almost vertical. The pushing direction of the concrete slurry inside the sleeve is opposite to its flowing direction, and under the action of gravity, the fluidity of the concrete slurry at the upper end of the sleeve is slightly less than that of the concrete slurry at its lower end (stratification phenomenon), which easily leads to the problem that the grout stopping piston is difficult to push the concrete, and even may form a blockage in the sleeve, preventing the grout stopping piston from plugging in time.

[0005] In view of this, the present application is specifically proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a construction device and a construction method for preventing the top arch of a tunnel secondary lining from being voided. The construction device is provided with at least one pressing member on the side of the outer sleeve member, and the inner side wall of the pressing member is recessed or flush with the inner side wall of the outer sleeve member, so as to solve the problem that when constructing the top arch of a tunnel secondary lining in the prior art, due to the pushing direction of the concrete slurry inside the sleeve being opposite to its flowing direction, it is easy to cause the problem that the grout stopping piston is difficult to push the concrete.

[0007] The embodiments of the present invention are realized through the following technical solutions: The embodiments of the present invention provide a construction device for preventing the top arch of a tunnel secondary lining from being voided, including:

[0008] An outer sleeve pipe fitting, the upper end of which is open for feeding concrete slurry into the bin, and a connection port is arranged on the side of the outer sleeve pipe fitting;

[0009] A branch pipe, one end of which is connected to the connection port, and the other end of which is used for connecting the pumping pipe of the concrete slurry to convey the concrete slurry to the outer sleeve pipe fitting;

[0010] A piston is arranged inside the outer sleeve pipe fitting, a driving rod is connected to the bottom thereof, and the driving rod penetrates through the bottom of the outer sleeve pipe fitting and extends outwards;

[0011] The driving rod is arranged such that when it is driven externally, it drives the piston to axially move inside the outer sleeve pipe fitting; when the piston is at the lowest position, the top surface of the piston is lower than the upper end surface of the connection port;

[0012] When the concrete slurry stops being pumped into the outer sleeve pipe fitting, the piston is arranged to push the remaining concrete slurry at its upper end into the bin through upward movement inside the outer sleeve pipe fitting and block the feeding port of the bin;

[0013] Wherein at least one pressing member with an inner side wall recessed or flush with the inner side wall of the outer sleeve pipe fitting is arranged on the side of the outer sleeve pipe fitting, and the pressing member is made of an elastic material;

[0014] When the outer sleeve pipe fitting is partially blocked, the pressing member can expand and deform outwards to enable the piston to move upwards smoothly.

[0015] Optionally, at least two pressing members are arranged, the inner side wall of each pressing member is recessed relative to the inner side wall of the outer sleeve pipe fitting, a single pressing member is an arc-shaped structure with an inward recess, and the projections of adjacent two pressing members are continuously connected in the horizontal direction.

[0016] Optionally, the upper edge of the pressing member at the highest position in the vertical direction is flush with the upper edge of the outer sleeve pipe fitting.

[0017] Optionally, a sealing member is arranged at the bottom of the outer sleeve pipe fitting, the sealing member includes an upper cover and a lower cover, and the upper cover and the lower cover are fixedly connected after overlapping;

[0018] A first guiding hole is arranged on the upper cover, a second guiding hole is arranged on the lower cover, the driving rod penetrates through the first guiding hole and the second guiding hole at the same time, and a pushing disc is arranged at the bottom end of the driving rod, and the pushing disc is located outside the outer sleeve pipe fitting.

[0019] Optionally, a first conical flexible sleeve is arranged above the first guiding hole, a second conical flexible sleeve is arranged below the second guiding hole, a first flexible hole is arranged at the top of the first conical flexible sleeve, a second flexible hole is arranged at the bottom of the second conical flexible sleeve, the driving rod penetrates through the first flexible hole and the second flexible hole at the same time, and the diameters of the first flexible hole and the second flexible hole are both smaller than the outer diameter of the driving rod.

[0020] Optionally, the driving rod is provided with internal threads on the first guiding hole and / or the second guiding hole of the screw rod. The internal threads are in spiral fit with the screw rod. When the push plate is rotated, the screw rod can spiral up or down;

[0021] Both the upper cover and the lower cover are provided with screw holes, and the upper cover and the lower cover are connected by bolts.

[0022] Optionally, it further includes a pumping pipe which is communicated with the branch pipe, and the pumping pipe is a flexible pipe.

[0023] Optionally, the outer sleeve pipe fitting includes a welded straight pipe at the upper part and a sleeve pipe at the lower part. The branch pipe is arranged on the sleeve pipe, and the outer sleeve pipe fitting further includes an annular buckle;

[0024] The bottom of the welded straight pipe is provided with a first buckle groove, the top of the sleeve pipe is provided with a second buckle groove, one end of the annular buckle is in snap fit and limited with the first buckle groove, and the other end is in snap fit and limited with the second buckle groove;

[0025] Anti-slurry buffer rubber rings are arranged between the first buckle groove and the second buckle groove and the annular buckle.

[0026] An embodiment of the present invention also provides a construction method for preventing the top arch of the secondary lining of a tunnel from being voided, which is realized by using the above construction device, and specifically includes the following steps:

[0027] S1: According to the lining bin section, debug and install the lining trolley in place;

[0028] S2: Open a feeding window hole at the top of the lining trolley and weld the welded straight pipe;

[0029] S3: Connect the sleeve pipe and the welded straight pipe by using the annular buckle;

[0030] S4: Adjust the piston to the position of the connection port;

[0031] S5: Install a shock-absorbing pumping pipe at the end of the branch pipe;

[0032] S6: Carry out pumping and feeding. After the pumping and feeding is completed, first push the piston to a position flush with the formwork of the lining trolley, and then remove the pumping pipe to prevent the concrete from flowing back;

[0033] S7: Carry out device cleaning.

[0034] Optionally, before the pumping and feeding in S6, it further includes wetting the pipelines and equipment with water.

[0035] Compared with the prior art, the embodiment of the present invention has the following advantages and beneficial effects:

[0036] 1. The construction device for preventing the void formation at the top arch of the secondary lining of the tunnel provided by the embodiment of the present invention is designed for the tunnel arch lining. Based on the structure in the prior art that can quickly block the feeding port of the bin by pushing the piston and then disassemble the pumping pipe, at least one extrusion member with an inner side wall that is recessed inward or flush with the inner side wall of the outer sleeve member is provided on the side of the outer sleeve member. This not only ensures that when the fluidity of the concrete slurry in the outer sleeve member is normal, the piston can push all the remaining concrete slurry into the bin and then block the feeding port of the bin, but also when the concrete slurry in the outer sleeve member is stratified and difficult to push, the extrusion member can allow the piston to be smoothly pushed upward due to its deformation function, so as to achieve the purpose of timely blocking the feeding port of the bin and prevent the concrete slurry in the bin from flowing backward.

[0037] Because when the concrete slurry in the outer sleeve member is in an unstratified state and the feeding port of the bin needs to be blocked, if the inner side of the extrusion member is flush with the inner side of the outer sleeve member, the piston can smoothly move from the bottom to the top of the outer sleeve member without the extrusion member deforming, and push the remaining concrete slurry into the bin and then block the feeding port of the bin; if the inner side of the extrusion member is concave relative to the inner side of the outer sleeve member, the piston needs the extrusion member to deform to smoothly move from the bottom to the top of the outer sleeve member, and the maximum deformation degree is that its inner side is flush with the inner side of the outer sleeve member to ensure that all the remaining concrete slurry can be pushed into the bin.

[0038] When the concrete slurry in the outer sleeve member is in a slightly stratified state and the feeding port of the bin needs to be blocked, whether the inner side of the extrusion member is flush with or concave to the inner side of the outer sleeve member, when the piston moves into contact with the difficult-to-push concrete slurry, the concrete slurry will generate resistance, and this resistance will be partially dispersed to the corresponding extrusion member to cause it to expand and deform outward, reducing the resistance for the piston to move upward, allowing the piston to continue to move upward smoothly and timely block the feeding port of the bin. Almost no concrete slurry flows backward during this process, and most of the remaining concrete slurry is also pushed into the bin. This structure is applicable to fluid slurries with weak fluidity.

[0039] 2. The embodiment of the present invention seals the bottom of the outer sleeve member with a double seal, which can achieve double guiding for the driving rod, improve the accuracy of driving the driving rod, and improve the stability of the device. Importantly, a first conical flexible sleeve is provided at the first guiding hole and a second conical flexible sleeve is provided at the second guiding hole. The first conical flexible sleeve and the second conical flexible sleeve not only have further guiding effects, but also have further sealing effects, and can also play a shock-absorbing role, improving the durability of the entire device.

[0040] 3. In the embodiment of the present invention, by setting the outer sleeve pipe fitting as a splicing structure of a welded straight pipe and a sleeve pipe, the welded straight pipe can be welded in advance and then the sleeve pipe can be movably connected to the lower end of the welded straight pipe, which improves the installation and use efficiency of the construction device for preventing the top arch of the secondary lining of the tunnel from being voided.

[0041] Generally speaking, a construction device and a construction method for preventing the top arch of the secondary lining of the tunnel from being voided provided by the embodiment of the present invention. The construction device is provided with at least one pressing member on the side surface of the outer sleeve pipe fitting, and the inner side wall of the pressing member is recessed inward or flush with the inner side wall of the outer sleeve pipe fitting, so as to avoid the phenomenon that the slurry stopping piston is difficult to push the concrete when constructing the top arch of the secondary lining of the tunnel due to the pushing direction of the concrete slurry inside the sleeve being opposite to its flowing direction. Brief Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0043] Figure 1 It is a structural diagram of the pumped slurry state of the construction device for preventing the top arch of the secondary lining of the tunnel from being voided provided by the embodiment of the present invention;

[0044] Figure 2 It is a structural diagram of the plugging state of the construction device for preventing the top arch of the secondary lining of the tunnel from being voided provided by the embodiment of the present invention;

[0045] Figure 3 It is a schematic diagram of the connection structure between the driving rod and the seal provided by the embodiment of the present invention;

[0046] Figure 4 It is a schematic diagram of the seal structure provided by the embodiment of the present invention;

[0047] Figure 5 It is a schematic diagram of the partial split structure of the construction device for preventing the top arch of the secondary lining of the tunnel from being voided provided by the embodiment of the present invention;

[0048] Figure 6 It is a flow chart of the construction method for preventing the top arch of the secondary lining of the tunnel from being voided provided by the embodiment of the present invention;

[0049] Figure 7 It is a physical diagram of the welding state of the welded straight pipe provided by the embodiment of the present invention;

[0050] Figure 8 It is the construction effect diagram after using the construction device for preventing the top arch of the secondary lining of the tunnel from being voided provided by the embodiment of the present invention.

[0051] Marks in the attached drawings and corresponding component names:

[0052] 1 - Outer sleeve pipe fitting, 2 - Connection port, 3 - Branch pipe, 4 - Pumping pipe, 5 - Piston, 6 - Driving rod, 7 - Extrusion piece, 8 - Sealing piece, 9 - Upper cover, 10 - Lower cover, 11 - First guiding hole, 12 - Second guiding hole, 13 - Pushing plate, 14 - First conical flexible sleeve, 15 - Second conical flexible sleeve, 16 - First flexible hole, 17 - Second flexible hole, 18 - Screw hole, 19 - Welded straight pipe, 20 - Sleeve pipe, 21 - Ring-shaped buckle, 22 - First buckle groove, 23 - Second buckle groove, 24 - Template. Specific implementation mode

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the attached drawings here can be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the present invention provided in the attached drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0055] It should be noted that: Similar reference numerals and letters represent similar items in the following attached drawings. Therefore, once an item is defined in one attached drawing, it does not need to be further defined and explained in subsequent attached drawings.

[0056] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0057] Embodiment

[0058] As Figure 1 and Figure 2 shown, the embodiment of the present invention provides a tunnel secondary lining crown anti-separation construction device, including an outer sleeve pipe fitting 1, a branch pipe 3, and a piston 5. The upper end opening of the outer sleeve pipe fitting 1 is used to send concrete slurry into the bin, and a connection port 2 is arranged on the side of the outer sleeve pipe fitting 1; one end of the branch pipe 3 is connected to the connection port 2, and the other end is used to connect the pumping pipe 4 of the concrete slurry to transport the concrete slurry to the outer sleeve pipe fitting 1; the piston 5 is arranged inside the outer sleeve pipe fitting 1, and a driving rod 6 is connected to its bottom, and the driving rod 6 extends out through the bottom of the outer sleeve pipe fitting 1; the driving rod 6 is arranged such that when it is driven externally, it drives the piston 5 to axially move inside the outer sleeve pipe fitting 1.

[0059] When the piston 5 is at the lowest position, the top surface of the piston 5 is lower than the upper end surface of the connection port 2; when the concrete slurry stops being pumped into the outer sleeve fitting 1, the piston 5 is arranged to push the remaining concrete slurry at its upper end into the bin after moving upward inside the outer sleeve fitting 1 and block the feeding port of the bin. In the embodiment of the present invention, at least one pressing member 7 with an inner side wall recessed inward or flush with the inner side wall of the outer sleeve fitting 1 is provided on the side surface of the outer sleeve fitting 1, and the pressing member 7 is made of an elastic material; when the outer sleeve fitting 1 is partially blocked, the pressing member 7 can expand and deform outward to enable the piston 5 to move upward smoothly.

[0060] Specifically, the branch pipe 3 is used to connect the outer sleeve fitting 1 and the pumping pipe 4 of the concrete slurry, and convey the pumped concrete slurry into the outer sleeve fitting 1. When the pumping stops, the piston 5 is axially moved inside the outer sleeve fitting 1 by the driving of the driving rod 6, pushing the remaining concrete slurry into the bin and blocking the feeding port of the bin. It should be noted that the positional relationship between the branch pipe 3 and the outer sleeve fitting 1 here can be vertical or inclined, which is not limited here, because in the embodiment of the present invention, the pumping pipe 4 is preferably set as a flexible pipe, which can not only improve the flexibility of the device but also has a shock-absorbing effect.

[0061] During operation, the concrete slurry enters the branch pipe 3 through the pumping pipe 4 and then enters the inside of the outer sleeve fitting 1 through the connection port 2 of the branch pipe 3. At this time, the piston 5 is at the lowest position of the outer sleeve fitting 1, and the top surface of the piston 5 is lower than the upper end surface of the connection port 2, and the concrete slurry can smoothly enter the inside of the outer sleeve fitting 1 through the space above the piston 5. When the concrete slurry stops being pumped into the outer sleeve fitting 1, the external driving device starts to work, drives the piston 5 to move upward inside the outer sleeve fitting 1 through the driving rod 6. When the piston 5 moves upward, it pushes the remaining concrete slurry in the outer sleeve fitting 1 into the bin, and at the same time blocks the feeding port of the bin to prevent the concrete slurry in the bin from flowing back.

[0062] In this process, if the fluidity of the concrete slurry inside the outer sleeve fitting 1 remains good, if the inner side of the pressing member 7 is flush with the inner side of the outer sleeve fitting 1, without the pressing member 7 deforming, the piston 5 can smoothly move from the bottom of the outer sleeve fitting 1 to the top, push the remaining concrete slurry into the bin and block the feeding port of the bin; if the inner side of the pressing member 7 is concave relative to the inner side of the outer sleeve fitting 1, for the piston 5 to smoothly move from the bottom of the outer sleeve fitting 1 to the top, the pressing member 7 needs to deform, and the maximum degree of deformation is that its inner side surface is flush with the inner side surface of the outer sleeve fitting 1 to ensure that all the remaining concrete slurry can be pushed into the bin.

[0063] If there is a slight layering phenomenon in the concrete slurry inside the outer sleeve pipe fitting 1, that is, the fluidity of the concrete slurry at the upper end of the outer sleeve pipe fitting 1 is slightly less than that of the concrete slurry at the lower end, in the prior art, this will make it difficult for the piston 5 to push the concrete. However, in the embodiment of the present invention, when the pumping of the concrete slurry into the outer sleeve pipe fitting 1 stops, the external driving device starts to work, drives the piston 5 to move upward inside the outer sleeve pipe fitting 1 through the driving rod 6. When the piston 5 moves to contact the concrete slurry that is difficult to push, a large resistance will be generated by the concrete slurry. Since the concrete slurry still has a certain fluidity, part of the resistance will be dispersed to the corresponding extrusion member 7, causing it to expand and deform outward. The outward expansion and deformation of the extrusion member 7 reduce the resistance of the piston 5 moving upward, allowing the piston 5 to continue moving upward smoothly and timely block the feeding port of the bin.

[0064] It should be noted that the extrusion member 7 is preferably arranged above the connection port 2. The specific number, size and shape can be set according to actual needs, as long as it can ensure the sufficient rigid support and flexible buffering purpose of the outer sleeve pipe fitting 1. As a preferred embodiment of the present invention, at least two extrusion members 7 are provided. The inner side wall of each extrusion member 7 is recessed inward relative to the inner side wall of the outer sleeve pipe fitting 1. A single extrusion member 7 is an arc-shaped structure recessed inward. The projections of adjacent two extrusion members 7 in the horizontal direction are continuously connected. The upper edge of the extrusion member 7 at the highest point in the vertical direction is flush with the upper edge of the outer sleeve pipe fitting 1. Specifically, at least two extrusion members 7 are provided to ensure sufficient elastic deformation ability in different vertical directions. The projections of adjacent two extrusion members 7 in the horizontal direction are continuously connected to ensure the formation of a continuous elastic support on the inner wall of the entire outer sleeve pipe fitting 1. The upper edge of the extrusion member 7 at the highest point in the vertical direction is flush with the upper edge of the outer sleeve pipe fitting 1 to reduce the possibility of blockage at the top of the outer sleeve pipe fitting 1.

[0065] Furthermore, as Figure 3 and Figure 4 shown, a seal 8 is provided at the bottom of the outer sleeve pipe fitting 1. The seal 8 includes an upper cover 9 and a lower cover 10. The upper cover 9 and the lower cover 10 are fixedly connected after overlapping; a first guiding hole 11 is provided on the upper cover 9, and a second guiding hole 12 is provided on the lower cover 10. The driving rod 6 passes through the first guiding hole 11 and the second guiding hole 12 at the same time. A push plate 13 is provided at the bottom end of the driving rod 6, and the push plate 13 is located outside the outer sleeve pipe fitting 1.

[0066] After the upper cover 9 and the lower cover 10 overlap, the fixed connection method can be welding, snap connection, bolt connection, etc., which is not limited here, as long as it can achieve a sufficient connection stability effect. The driving rod 6 passes through the first guiding hole 11 of the upper cover 9 and the second guiding hole 12 of the lower cover 10 at the same time, ensuring the smooth movement of the driving rod 6 at the bottom of the outer sleeve member 1 and preventing its inclination from causing the piston 5 to move stuck. The push plate 13 is located outside the outer sleeve member 1, providing a relatively large force-bearing surface for the operator to apply force to drive the piston 5. Of course, the driving force can also come from an external motor, cylinder, etc., which is not limited here and can be specifically set according to actual needs.

[0067] In the embodiment of the present invention, the first guiding hole 11 and the second guiding hole 12 provide precise guidance for the driving rod 6, ensuring the smooth and linear movement of the driving rod 6 at the bottom of the outer sleeve member 1, which helps to improve the movement accuracy of the piston 5 inside the outer sleeve member 1, thereby improving the plugging effect.

[0068] As a preferred embodiment of the present invention, a first conical flexible sleeve 14 is provided above the first guiding hole 11, a second conical flexible sleeve 15 is provided below the second guiding hole 12, a first flexible hole 16 is provided at the top of the first conical flexible sleeve 14, a second flexible hole 17 is provided at the bottom of the second conical flexible sleeve 15, the driving rod 6 passes through the first flexible hole 16 and the second flexible hole 17 at the same time, and the diameters of the first flexible hole 16 and the second flexible hole 17 are both smaller than the outer diameter of the driving rod 6. The first conical flexible sleeve 14 and the second conical flexible sleeve 15 can provide a certain buffer during the movement of the driving rod 6, reduce the impact force generated by the movement, and extend the service life of the device.

[0069] More preferably, the driving rod 6 is a screw rod, internal threads are provided on the first guiding hole 11 and / or the second guiding hole 12, and the internal threads are in spiral fit with the screw rod. When the push plate 13 is rotated, the screw rod can spiral up or down; screw holes 18 are provided on both the upper cover 9 and the lower cover 10, and the upper cover 9 and the lower cover 10 are connected by bolts. The spiral fit of the internal threads and the screw rod allows the position of the piston 5 to be precisely controlled by rotating the push plate 13, realizing the pushing and plugging of the concrete slurry.

[0070] Furthermore, as Figure 5As shown in the figure, the outer sleeve pipe fitting 1 includes a welded straight pipe 19 at the upper part and a sleeve pipe 20 at the lower part. The branch pipe 3 is arranged on the sleeve pipe 20. The outer sleeve pipe fitting 1 further includes an annular buckle 21. A first buckle groove 22 is arranged at the bottom of the welded straight pipe 19, and a second buckle groove 23 is arranged at the top of the sleeve pipe 20. One end of the annular buckle 21 is engaged and limited with the first buckle groove 22, and the other end is engaged and limited with the second buckle groove 23. A slurry-stop buffer rubber ring is arranged between the first buckle groove 22 and the second buckle groove 23 and the annular buckle 21. The function of the slurry-stop buffer rubber ring is to prevent the concrete slurry from leaking from the connection between the welded straight pipe 19 and the sleeve pipe 20, and at the same time provide a buffer function to reduce the connection looseness caused by vibration or impact. The annular buckle 21 ensures the connection stability between the welded straight pipe 19 and the sleeve pipe 20 through engagement and limitation, prevents loosening during construction, and the split structure and the buckle connection method are convenient for installation and disassembly, improving the construction efficiency.

[0071] For the convenience of understanding, an embodiment of the present invention further provides a construction method for preventing the top arch of the secondary lining of a tunnel from being voided, as Figure 6 shown, which is realized by using the above construction device and includes the following steps:

[0072] 1. Construction preparation: According to the lining bin section, the lining trolley (steel form trolley) is debugged and installed in place to ensure the accurate position of the trolley and provide a stable formwork support for subsequent construction (as shown by the reference numeral 24 in Figure 1 and Figure 2 ).

[0073] 2. Installation of the feeding channel

[0074] Drilling holes and welding and installing fixed pipes on the top of the steel form trolley: Uniform feeding window holes are drilled on the top of the steel form trolley at an interval of 4 meters, and Ф150 steel straight pipes (welded straight pipes, as shown in Figure 7 ) are welded, with a length of 25 cm and an annular buckle groove. The weld is required to be full, with a height of 4 mm, and additional reinforcement materials are added for further fixation to facilitate connection with subsequent devices;

[0075] Install and debug the "construction device for preventing the top arch of the secondary lining of a tunnel from being voided": Connect the device with the steel straight pipe on the top of the steel form trolley by a ring-type buckle, and add a slurry-stop buffer rubber ring to prevent the concrete slurry from seeping out. Adjust the spiral jack plug to the position of the inclined feeding pipe orifice to form a single-hole curved feeding channel to avoid the accumulation of concrete aggregates caused by the jack plug not reaching the position. After installation and debugging, check each connection part to ensure that the device is firmly installed and reliably sealed.

[0076] 3. Connection of the pumping equipment: Install a shock-absorbing pumping hose at the inclined feeding pipe orifice, connect one end with the inclined feeding pipe of the device through an annular buckle, and connect the other end with the steel pump pipe and the pump truck. The overall pump pipe is fixed by a drag rope to prevent the pumping impact force from damaging the device and ensure the stability of the conveying pipeline.

[0077] 4. Concrete pumping construction: Use C25P8 secondary concrete, and control the slump into the warehouse at 14-16 cm. Before pumping, wet the pump truck and pump pipe with water, then pump 1-2 cubic meters of mortar to lay the bottom, and then pump C25 concrete truck by truck. During the pumping process, strengthen the vibration and change the feeding position to ensure that the concrete is dense and the feeding is balanced.

[0078] 5. Blocking of the arch feed port: After the pumping is completed, first quickly push the spiral push rod plug to the same level as the steel mold trolley template, and then remove the hose to prevent concrete backflow. During the blocking process, strictly follow the order of pushing the push rod plug first and then removing the hose to prevent concrete backflow.

[0079] 6. Post-construction treatment

[0080] Cleaning of the device: flush the device with a high-pressure water gun, and then wipe the water in the pipe with a towel to prevent the device pipe from rusting;

[0081] After the concrete is poured, it is strengthened, and the formwork is removed when the strength reaches 5MPa or above. After the formwork is removed, it is sprayed with water by a sprinkler truck for no less than 14 days to ensure the strength and durability of the concrete. The construction effect is visible. Figure 8 shown.

[0082] In this construction method, when the straight feeding pipe on the top of the steel mold trolley is connected to the device, a slurry-stopping buffer rubber ring is added to ensure sealing and prevent slurry leakage; when installing the device, the piston position is accurately adjusted to form a reasonable single-hole curved feeding channel to prevent aggregate accumulation in the guide pipe; after the feeding is completed, the operation is strictly carried out in the order of pushing the top piston first and then removing the pumping pipe to achieve the purpose of eliminating concrete backflow.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. It should be noted that the structures or components illustrated in the accompanying drawings are not necessarily drawn to scale, and the present invention omits the description of known components and processing technologies and processes to avoid unnecessary limitations on the present invention.

Claims

1. A tunnel secondary lining arch anti-emptying construction device, characterized in that: include: An outer sleeve (1) having an upper opening for delivering concrete slurry into the bin, and a connecting port (2) is provided on the side of the outer sleeve (1); A branch pipe (3), one end of which is connected to the connection port (2), and the other end of which is used to connect to a concrete slurry pumping pipe (4) to transport concrete slurry to the outer casing (1); A piston (5) is arranged in the outer sleeve (1), and a driving rod (6) is connected to the bottom of the piston (5). The driving rod (6) penetrates the bottom of the outer sleeve (1) and extends outwards; The driving rod (6) is configured to drive the piston (5) to move axially inside the outer sleeve (1) after the outer portion thereof is driven; when the piston (5) is located at the lowest position, the top surface of the piston (5) is lower than the upper end surface of the connecting port (2); When the concrete slurry stops being pumped into the outer sleeve (1), the piston (5) is configured to push the remaining concrete slurry at its upper end into the bin after moving upward inside the outer sleeve (1), thereby blocking the inlet of the bin; The side surface of the outer sleeve (1) is provided with at least one extrusion piece (7) whose inner side wall is concave or flat relative to the inner side wall of the outer sleeve (1), and the extrusion piece (7) is made of elastic material; When the outer sleeve (1) is partially blocked, the extrusion member (7) can expand and deform outwards, allowing the piston (5) to move upwards smoothly.

2. A tunnel secondary lining arch anti-emptying construction device according to claim 1, characterized in that: At least two extrusion pieces (7) are provided, and the inner side wall of each extrusion piece (7) is recessed inwardly relative to the inner side wall of the outer sleeve piece (1). A single extrusion piece (7) is an inwardly recessed arc-shaped structure, and the projections of two adjacent extrusion pieces (7) in the horizontal direction are continuously connected.

3. A tunnel secondary lining arch anti-emptying construction device according to claim 2, characterized in that: The upper edge of the extruded part (7) at the highest point in the vertical direction is flush with the upper edge of the outer sleeve part (1).

4. A tunnel secondary lining arch anti-emptying construction device according to claim 1, characterized in that: A sealing member (8) is provided at the bottom of the outer sleeve member (1), wherein the sealing member (8) comprises an upper cover (9) and a lower cover (10), wherein the upper cover (9) and the lower cover (10) are overlapped and fixedly connected; The upper cover (9) is provided with a first guide hole (11), the lower cover (10) is provided with a second guide hole (12), the driving rod (6) simultaneously passes through the first guide hole (11) and the second guide hole (12), the bottom end of the driving rod (6) is provided with a push plate (13), and the push plate (13) is located on the outside of the outer sleeve (1).

5. A tunnel secondary lining arch anti-emptying construction device according to claim 4, characterized in that: A first conical flexible sleeve (14) is arranged above the first guide hole (11), a second conical flexible sleeve (15) is arranged below the second guide hole (12), a first flexible hole (16) is arranged at the top of the first conical flexible sleeve (14), a second flexible hole (17) is arranged at the bottom of the second conical flexible sleeve (15), the driving rod (6) passes through the first flexible hole (16) and the second flexible hole (17) at the same time, and the apertures of the first flexible hole (16) and the second flexible hole (17) are both smaller than the outer diameter of the driving rod (6).

6. A tunnel secondary lining arch anti-emptying construction device according to claim 5, characterized in that: The driving rod (6) is provided with an internal thread on the first guide hole (11) and / or the second guide hole (12) of the screw, and the internal thread is in spiral engagement with the screw, so that when the push plate (13) is rotated, the screw can be spirally raised or lowered; The upper cover (9) and the lower cover (10) are both provided with screw holes (18), and the upper cover (9) and the lower cover (10) are connected by bolts.

7. The tunnel secondary lining arch anti-emptying construction device according to claim 1 is characterized in that: It also comprises a pumping pipe (4), wherein the pumping pipe (4) is connected to the branch pipe (3), and the pumping pipe (4) is a flexible pipe.

8. The tunnel secondary lining arch anti-emptying construction device according to claim 1 is characterized in that: The outer sleeve member (1) comprises an upper welded straight pipe (19) and a lower sleeve pipe (20), the branch pipe (3) is arranged on the sleeve pipe (20), and the outer sleeve member (1) further comprises an annular buckle (21); The bottom of the welded straight pipe (19) is provided with a first buckle groove (22), the top of the sleeve pipe (20) is provided with a second buckle groove (23), one end of the annular buckle (21) is engaged with the first buckle groove (22) for limiting position, and the other end is engaged with the second buckle groove (23) for limiting position; A slurry-stopping buffer rubber ring is provided between the first buckle groove (22), the second buckle groove (23) and the annular buckle (21).

9. A tunnel secondary lining arch anti-cavitation construction method, comprising using the construction device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: According to the lining bin section, the lining trolley is debugged and installed in place; S2: Opening a material feeding window hole on the top of the lining platform and welding the welding straight pipe (19); S3: Connecting the sleeve pipe (20) to the welded straight pipe (19) using an annular buckle (21); S4: Adjust the piston (5) to the position of the connection port (2); S5: Installing a shock-absorbing pumping pipe (4) at the end of the branch pipe (3); S6: Pumping the material in. After the pumping is completed, the piston (5) is first pushed to a position flush with the template (24) of the lining trolley, and then the pumping pipe (4) is removed to prevent the concrete from flowing back; S7: Clean the device.

10. A tunnel secondary lining top arch anti-cavitation construction method according to claim 9, characterized in that: Before pumping the material into S6, the pipes and equipment are wetted with water.

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