Construction method for continuously variable cross-section tunnel lining concrete pouring

Abstract

The present application relates to the technical field of tunnel lining construction method, and particularly refers to a continuous variable cross-section tunnel lining concrete pouring construction method. The method is performed according to the following steps: S1, pouring a bottom plate at the bottom of the tunnel and laying a track; S2, assembling a single-column formwork trolley structure in the tunnel; S3, adjusting the formwork trolley according to the tunnel cross section of the construction position; S4, pouring construction of tunnel lining concrete based on the adjusted formwork trolley; for small and medium-sized tunnels, a single-column formwork trolley is used for concrete pouring construction; for large tunnels, two groups of trolley units are arranged side by side along the tunnel to form a double-column formwork trolley for concrete pouring construction; the construction method of the present application can not only meet the requirements of tunnel cross section size change, but also ensure the working space in the tunnel, and at the same time, the influence of formwork installation and removal process on construction efficiency is avoided, the number of formwork trolleys is reduced, and the construction cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel lining construction methods, in particular to a continuous variable cross-section tunnel lining concrete pouring construction method. BACKGROUND

[0002] The formwork trolley is a special mechanical construction equipment for supporting and pouring lining concrete, which is widely used in the construction of tunnel engineering. With the design and construction technology of the formwork trolley becoming more and more mature, the formwork trolley construction technology is also applied to many subway station projects and pipe gallery projects. In conventional mountain tunnel, the tunnel cross-section size is relatively single, and when the formwork trolley is used, only one or two sets of formwork trolleys are usually configured according to the design requirements of the tunnel cross-section. For example, the Chinese invention patent with the patent number CN114876518A, named "a split type arbitrary variable cross-section formwork trolley and its construction method", discloses a split type arbitrary variable cross-section formwork trolley, which comprises a trolley system, a formwork system and a walking system. The formwork system comprises a top formwork and two side formworks, the two side formworks are arranged on both sides of the trolley system, the top formwork is arranged above the trolley system, adjusting oil cylinders are connected between the two side formworks and the trolley system, and a top formwork frame adjusting system is connected between the top formwork and the trolley system. The top formwork comprises a plurality of top formwork standard modules which are hingedly connected to each other, and the walking system is arranged at the bottom of the trolley system. The formwork trolley of the invention can adapt to tunnel construction of different cross-sections, but in fact, the structure of the formwork trolley provided by the invention is temporarily increased in the process of adapting to the conversion of large and small cross-sections. For example, in the case of one times tunnel cross-section, the trolley uses one set of trolley system for support, and when two times tunnel cross-section is involved, the trolley needs to temporarily install one set of trolley system for support. In fact, the process of such modification and adjustment is relatively complicated, because the trolley system itself is relatively wide, and it is difficult to transport in the tunnel. In the process of converting from small cross-section tunnel to large cross-section tunnel, the new trolley system needs to be transported from the tunnel entrance to the construction site, and the whole installation and debugging process is difficult, which seriously restricts the construction process. Moreover, the trolley structure cannot be said to adapt to the change of arbitrary cross-section, because in the construction process of large cross-section tunnel, two sets of trolley systems need to be connected together, and they are dependent on each other. For large tunnel structures, the support structure between the two sets of trolley systems cannot be extended arbitrarily, and the spacing between the two sets of trolley systems increases, which reduces the structural bearing capacity above the trolley system and affects the safety of the whole structure. Therefore, the existing formwork trolley still has many problems in adapting to the continuous variable cross-section tunnel lining concrete pouring construction. SUMMARY

[0003] The purpose of the present application is to solve the problems in the background art, and to provide a continuous variable cross-section tunnel lining concrete pouring construction method.

[0004] The technical scheme of the present application is a continuous variable cross-section tunnel lining concrete pouring construction method, which is performed according to the following steps:

[0005] S1, pouring a bottom plate at the bottom of the tunnel, and laying tracks according to the cross-section of the tunnel;

[0006] S2, assembling two groups of trolley units in the tunnel, and connecting the two groups of trolley units in the longitudinal direction of the tunnel to form a single-column formwork trolley structure;

[0007] S3, driving the single-column formwork trolley to move to a tunnel lining concrete pouring construction position along the tracks, and adjusting the formwork trolley according to the cross-section of the tunnel at the construction position;

[0008] S4, pouring the tunnel lining concrete based on the adjusted formwork trolley, demolding after the poured concrete reaches the design strength, moving the formwork trolley to the next construction position for construction, and continuing until all construction positions in the tunnel are completed;

[0009] The method of adjusting the formwork trolley according to the cross-section of the construction position includes: for a small tunnel, using a single-column formwork trolley formed by longitudinally arranging two groups of trolley units for concrete pouring construction; for a medium-sized tunnel, adjusting the width and height of the single-column formwork trolley composed of two groups of trolley units for concrete pouring construction; and for a large tunnel, arranging two groups of trolley units in parallel along the transverse direction of the tunnel to form a double-column formwork trolley for concrete pouring construction;

[0010] The cross-sectional area of the small tunnel is smaller than that of the medium-sized tunnel, and the cross-sectional area of the medium-sized tunnel is smaller than that of the large tunnel.

[0011] According to the continuous variable cross-section tunnel lining concrete pouring construction method provided by the present application, in step S2, the method of assembling two groups of trolley units in the tunnel includes: building telescopic legs on two tracks respectively, arranging telescopic crossbeams at the upper ends of the telescopic legs to form a trolley gantry, arranging a first top die on the telescopic crossbeams, and arranging a first side die on the side of the telescopic legs through a plurality of first connecting lead screws, to form a group of trolley units, building another group of trolley units in front of or behind the group of trolley units in the longitudinal direction, and connecting the two groups of trolley units in the longitudinal direction to form a single-column formwork trolley.

[0012] According to the continuous variable cross-section tunnel lining concrete pouring construction method provided by the present application, for a large tunnel, the connection of the two groups of trolley units in the longitudinal direction of the single-column trolley structure is released, one of the two groups of trolley units is moved to the other side of the tunnel in the transverse direction, a double-column formwork trolley arranged in parallel along the transverse direction of the tunnel is formed, a disc buckle support is built based on the two groups of trolley units, a second top die is arranged on the disc buckle support, and a second side die is arranged on the side of the disc buckle support and the two groups of trolley units.

[0013] According to the application, a continuous variable cross-section tunnel lining concrete pouring construction method is provided, and the method for building a disc buckle support based on two groups of trolley units comprises the following steps: arranging a plurality of support rods on the two groups of trolley units, arranging a plurality of stand columns on the tunnel bottom plate between the two groups of trolley units, installing a base on the upper end of the support rods and the stand columns, and building a disc buckle support on the base.

[0014] According to the application, a continuous variable cross-section tunnel lining concrete pouring construction method is provided, and after the disc buckle support is built, a second top die is installed on the top of the disc buckle support, a third side die is installed on the side of the disc buckle support and the side of the support rod through a second connecting lead screw, and the first side die on the side of the trolley unit is adjusted so that the first side die and the third side die are combined to form a second side die corresponding to the side wall of a large tunnel.

[0015] According to the application, a continuous variable cross-section tunnel lining concrete pouring construction method is provided, and a support rod is installed on the upper end of the telescopic supporting leg of the two groups of trolley units, and a stand column that can move along the longitudinal direction is arranged on the tunnel bottom plate between the two groups of trolley units.

[0016] According to the application, a continuous variable cross-section tunnel lining concrete pouring construction method is provided, and the method for adjusting the width and height of a single-column formwork trolley composed of two groups of trolley units comprises the following steps: installing a support stool on the lower end of the telescopic supporting leg, suspending the telescopic supporting leg on the track, adjusting the length of the telescopic supporting leg so that the first top die is attached to the top of the tunnel, adjusting the length of the first connecting lead screw so that the first side die is attached to the side of the tunnel, and after the adjustment is completed, removing the support stool so that the lower end of the telescopic supporting leg is supported on the track again, and the adjustment of the width and height of the single-column formwork trolley is completed.

[0017] According to the application, a continuous variable cross-section tunnel lining concrete pouring construction method is provided, and in step S1, the method for laying tracks according to the tunnel cross-section comprises the following steps: for a small tunnel, laying two first tracks extending along the longitudinal direction of the tunnel on the bottom plate close to the side wall of the tunnel; for a medium-sized tunnel, laying two second tracks extending along the longitudinal direction of the tunnel on the bottom plate close to the side wall of the tunnel; and for a large tunnel, laying four third tracks extending along the longitudinal direction of the tunnel on the bottom plate close to the side wall of the tunnel, and the four third tracks are divided into two groups and arranged on both sides of the bottom plate and correspond to and parallel to the track structure of the two groups of trolley units, and laying a plurality of fourth tracks extending along the longitudinal direction of the tunnel on the bottom plate at the middle position of the tunnel.

[0018] According to the application, a continuous variable cross-section tunnel lining concrete pouring construction method is provided, and a method for arranging a first top die on a telescopic crossbeam comprises: installing a top die support on the telescopic crossbeam, the top die support comprising a plurality of telescopic supports connected together in a body along the transverse telescopic adjustment, and at least one steel die plate is installed on each telescopic support, and adjacent steel die plates are hingedly connected together to rotate around a longitudinal axis to form the first top die.

[0019] According to the application, a continuous variable cross-section tunnel lining concrete pouring construction method is provided, and the small tunnel is a tunnel with a cross-sectional area of 1 times, the medium tunnel is a tunnel with a cross-sectional area of 1-1.3 times, and the large tunnel is a tunnel with a cross-sectional area of 2 times or more.

[0020] For tunnel lining concrete pouring construction of a tunnel with a cross-sectional area of 1.3-2 times, the connection between the two groups of trolley units in the longitudinal direction of the single-column trolley structure is released, one group of trolley units is moved to the other side of the tunnel along the transverse direction, and the two groups of trolley units are connected in a body along the transverse direction, the die plates are arranged on the two groups of trolley units, and then the lining concrete pouring construction is performed.

[0021] The application has the following advantages: 1. In the tunnel lining concrete pouring construction process, the tunnel cross-section can be adjusted accordingly, the two groups of trolley units can be combined into a single-column die plate trolley along the longitudinal direction for pouring construction in a small tunnel, the single-column die plate trolley can be adjusted in width and height for pouring construction in a medium tunnel, and the two groups of trolley units in the single-column die plate trolley can be split and arranged in parallel along the transverse direction to form a parallel die plate trolley for pouring construction in a large tunnel. When the construction method of the application switches from a small tunnel or a medium tunnel to a large tunnel, new trolley modules do not need to be temporarily transported from the tunnel entrance, the adjustment is convenient and simple, the construction efficiency is high, and the application has great popularization value.

[0022] 2. The trolley unit structure of the application is simple, the installation and operation are convenient, the single-column die plate trolley is extremely convenient to build, and the single-column die plate trolley is extremely simple to split into a parallel die plate trolley, which greatly reduces the difficulty of tunnel lining concrete pouring construction and improves the construction efficiency.

[0023] 3. When the small tunnel or the medium tunnel switches to the large tunnel, one group of trolley units in the single-column die plate trolley is moved to the other side of the tunnel to form a double-column parallel arrangement of the parallel die plate trolley, the trolley unit serves as a support part of the entire disc buckle support, the second top die and the second side die are installed, the overall building and installation method is extremely simple, the disc buckle support built based on the trolley unit can also move along the longitudinal direction of the tunnel, and continuous construction is facilitated.

[0024] 4. The method of constructing the disc buckle bracket in this application is based on two sets of trolley units. By installing support rods on the trolley units and installing columns on the tunnel floor between the two sets of trolley units, the base is supported by the support rods and columns, and the disc buckle bracket is constructed on the base. The entire construction process is extremely simple and the construction difficulty is extremely low.

[0025] 5. This application utilizes the side of the disc-lock bracket and the side of the support rod to install the third side mold, and uses part of the first side mold in the original trolley unit to connect with the third side mold to form a second side mold that is suitable for the sidewall of a large tunnel. The arrangement of the entire second side mold is simple and the subsequent demolding is convenient.

[0026] 6. The support rod of this application is fixed on the corresponding telescopic outrigger, and the column in the middle of the base can move longitudinally along the tunnel. That is to say, the entire disc buckle bracket can move longitudinally along the tunnel under the action of the two sets of trolley units and the column, so as to realize the continuous construction of tunnel lining concrete pouring and greatly improve the construction efficiency.

[0027] 7. The present application provides a simple method for adjusting the width and height of a single-row template trolley. The single-row template trolley is fixed by a support stool, and the length of the telescopic legs is adjusted according to the required height. The overall width is adjusted by the first connecting screw, which can quickly adapt to the switching from small tunnels to medium-sized tunnels.

[0028] 8. This application lays out corresponding track structures for different tunnel cross sections. For small and medium-sized tunnels, laying two tracks is sufficient to meet construction requirements. For large tunnels, because a parallel arrangement mode is adopted, four third tracks corresponding to the trolley unit and two fourth tracks corresponding to the central support structure of the disc buckle bracket are set up, which effectively improves the stability and safety of the concrete pouring construction of large tunnel lining and facilitates the subsequent movement of the overall construction structure.

[0029] 9. The arrangement structure of the first top formwork in this application is extremely simple. By adjusting the angle and position of the corresponding steel formwork through multiple telescopic supports, the corresponding steel formwork can be easily adjusted to a suitable position to adapt to the shape of the tunnel top. Moreover, the first top formwork is a modular structure, which is extremely convenient to install and disassemble, and construction can be carried out without large hoisting equipment.

[0030] 10. The tunnel cross-section variation range of this application is extremely large, covering tunnel lining concrete pouring construction with a cross-sectional area of ​​1 to 1.3 times and more than twice the cross-sectional area, and its application scope is extremely wide.

[0031] The construction method of the application can meet the requirements of tunnel section size change, ensure the working space in the tunnel, avoid the influence of formwork installation and removal process on construction efficiency, ensure the construction quality of tunnel secondary lining pouring, reduce the formwork erection and removal time in the process of switching different section sizes, improve the construction efficiency, reduce the number of formwork trolley sets, and save the construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0032] Fig. 1 : Single-column formwork trolley structure schematic diagram applied to small tunnel;

[0033] Fig. 2 : Single-column formwork trolley structure schematic diagram applied to medium-sized tunnel;

[0034] Fig. 3 : Parallel formwork trolley structure schematic diagram applied to large tunnel;

[0035] Wherein: 1 - telescopic leg; 2 - telescopic beam; 3 - first top die; 4 - first side die; 5 - top die support; 6 - first connecting screw; 7 - telescopic oil cylinder; 8 - first track; 9 - second track; 10 - support rod; 11 - column; 12 - third track; 13 - fourth track; 14 - base; 15 - disc buckle support; 16 - second top die; 17 - third side die; 18 - second connecting screw. DETAILED DESCRIPTION

[0036] The embodiments of the application are described in detail below, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application.

[0037] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation of the application.

[0038] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] The present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] As Figs. 1-3 shown, the present application relates to a continuous variable cross-section tunnel lining concrete pouring construction method, which is applied in the case where the tunnel cross-section continuously changes, and the change range is relatively large. Purely according to the existing technology, the adjusting structure of the formwork trolley cannot be applied. In view of this situation, the present application develops a set of applicable construction method.

[0041] Specifically, the following steps are taken:

[0042] S1, pouring the bottom plate at the bottom of the tunnel, laying the track according to the tunnel cross-section;

[0043] After the initial support construction of the tunnel excavation is completed, the tunnel bottom plate is poured first. In the pouring process of the bottom plate, in order to facilitate the installation of the subsequent formwork trolley traveling track, it is necessary to install embedded parts on the bottom plate. After the bottom plate is poured and stabilized, the track is laid on the bottom plate according to the embedded parts. The subsequent formwork trolley moves longitudinally in the tunnel relying on the track.

[0044] The longitudinal direction of the present application refers to the extension direction of the tunnel, and the transverse direction refers to the horizontal direction perpendicular to the extension direction of the tunnel.

[0045] S2, assembling two groups of trolley units in the tunnel, and connecting the two groups of trolley units along the longitudinal direction of the tunnel to form a single-column formwork trolley structure;

[0046] In the pouring construction process of all tunnel construction positions, two groups of trolley units are used, and no subsequent trolley unit is added;

[0047] The trolley unit is usually assembled at the entrance of the tunnel. The tunnel entrance is usually a small tunnel. In order to facilitate the carrying and moving of the trolley unit, the two groups of trolley units are usually connected longitudinally to form a single-column formwork trolley structure when the trolley unit is assembled.

[0048] S3, driving the single-column formwork trolley to move along the track to the tunnel lining concrete pouring construction position, and adjusting the formwork trolley according to the tunnel cross-section of the construction position;

[0049] The single-column template trolley is moved to the construction position along the track in the tunnel, and then adjusted according to the tunnel section of the construction position to achieve the required construction state.

[0050] For small tunnels, a single-column template trolley formed by longitudinally arranging two groups of trolley units is used for concrete pouring construction, as shown in Fig. 1 For medium-sized tunnels, the width and height of the single-column template trolley formed by two groups of trolley units are adjusted for concrete pouring construction, as shown in Fig. 2 For large tunnels, two groups of trolley units are arranged side by side in the tunnel to form a double-column template trolley for concrete pouring construction, as shown in Fig. 3 .

[0051] S4, based on the adjusted template trolley, the tunnel lining concrete is poured and constructed, and after the poured concrete reaches the design strength, the template trolley is removed and moved to the next construction position for construction until all construction positions in the tunnel are completed.

[0052] The entire lining concrete pouring construction in the tunnel is carried out in sections. After the lining concrete pouring construction at the current construction position is completed, the trolley unit is driven to move to the next construction position in the longitudinal direction of the tunnel, and the construction is carried out in sections until the lining concrete pouring construction at all construction positions in the tunnel is completed.

[0053] The small tunnel of the present application is determined according to the structure of the trolley unit. Assuming that the cross-sectional area of the small tunnel is 1 times the cross-sectional area of the tunnel, the medium-sized tunnel is 1-1.3 times the cross-sectional area of the tunnel, and the large tunnel is 2 times the cross-sectional area of the tunnel. That is, the single-column template trolley is applied to small tunnels and medium-sized tunnels, and when applied to small tunnels and medium-sized tunnels, the single-column template trolley itself can be adjusted to adapt to the change of the tunnel cross section. When applied to large tunnels, the single-column template trolley needs to be converted into a side-by-side template trolley for horizontal and vertical expansion to adapt to the change of the large tunnel cross section.

[0054] For tunnels with a cross-sectional area of 1.3 to 2 times the cross-sectional area, simply adjusting the height and width of the single-column formwork trolley cannot adapt to the change in the cross-sectional area of the tunnel. For tunnel lining concrete pouring construction with a cross-sectional area of 1.3 to 2 times the cross-sectional area, the following method can be used: remove the connection between the two groups of trolley units in the longitudinal direction of the single-column trolley structure, move one group of trolley units to the other side of the tunnel in the transverse direction, and connect the two groups of trolley units arranged side by side in the transverse direction into one, arrange the formwork (including the first top formwork and the first side formwork) on the two groups of trolley units, and then perform lining concrete pouring construction. In fact, this method is the method introduced in the Chinese invention patent with the patent number "CN114876518A" and the name "A split-body type arbitrary variable cross-section formwork trolley and its construction method". By splitting the two groups of trolley units in the single-column formwork trolley into a side-by-side mode, the top formwork and the side formwork on the two groups of trolley units are then used for lining concrete pouring construction.

[0055] In some embodiments of the present application, the above step S1 is optimized. In the above step S1, the method of laying tracks according to the tunnel cross-sectional condition includes: for small tunnels, laying two first tracks 8 extending along the longitudinal direction of the tunnel on the bottom plate near the side wall of the tunnel; for medium-sized tunnels, laying two second tracks 9 extending along the longitudinal direction of the tunnel on the bottom plate near the side wall of the tunnel; for large tunnels, laying four third tracks 12 extending along the longitudinal direction of the tunnel on the bottom plate near the side wall of the tunnel, the four third tracks are divided into two groups and arranged on both sides of the bottom plate and correspond to two groups of trolley units arranged side by side, and laying a plurality of (two in the present application, which can be adjusted according to actual needs) fourth tracks 13 extending along the longitudinal direction of the tunnel on the bottom plate in the middle of the tunnel.

[0056] Among them, the distance between the first track 8, the second track 9 and the third track 12 and the corresponding tunnel side wall is within a certain range. When a small tunnel is connected to a medium-sized tunnel, the first track 8 can be extended into the medium-sized tunnel and overlap a part of the second track 9 in the transverse direction. When the single-column formwork trolley enters the medium-sized tunnel through the first track 8, it can be transferred to the second track 9 by using a jack or a translation trolley. Similarly, the single-column formwork trolley can be transferred into a large tunnel in the same way. For example, when a medium-sized tunnel is switched to a large tunnel, a part of the second track 9 can be extended into the large tunnel, so that the second track 9 overlaps the third track 12 in the transverse direction. Then, the single-column formwork trolley can be transferred to the third tracks 12 on both sides by using a jack or a translation trolley, forming a side-by-side formwork trolley structure.

[0057] The first track 8, the second track 9, the third track 12 and the fourth track 13 are all installed based on the pre-buried parts on the tunnel bottom plate.

[0058] In some embodiments of the present application, the step S2 is optimized, and the method of assembling two groups of trolley units in the tunnel comprises the following steps. Figs. 1-2 As shown in the figure, the telescopic legs 1 are respectively built on two tracks (which can be the first track 8, the second track 9 or the third track 12), and the telescopic legs 1 are provided with lifting oil cylinders. The lower end of the telescopic leg 1 is provided with a first driving wheel which is slidingly connected to the track. A rotary motor is also installed on the telescopic leg 1 to drive the first driving wheel to rotate 90° around the vertical axis, so as to avoid the sliding of the first driving wheel with the track when the trolley unit needs to be fixed. The upper end of the telescopic leg 1 is arranged with a telescopic beam 2 which forms a trolley portal with the telescopic legs 1 on both sides. The telescopic beam 2 comprises two groups of beam bodies which are telescopically connected together in the transverse direction. When the width needs to be adjusted, the connection between the two adjacent groups of beam bodies is released, and then the length of the telescopic connection is changed to adjust the transverse length of the telescopic beam 2. After the adjustment is completed, the adjacent beam bodies are fixed together through the bolt structure. The first top die 3 is arranged at the upper end of the telescopic beam 2, and the first side die 4 is arranged at the side of the telescopic leg 1 through a plurality of first connecting lead screws 6 to form a group of trolley units. Another group of trolley units is built in front of or behind the trolley units in the longitudinal direction, and the two groups of trolley units are connected in the longitudinal direction to form a single-column formwork trolley.

[0059] In a further building method, the method of arranging the first top die on the telescopic beam 2 comprises the following steps. Figs. 1-2 As shown in the figure, two groups of telescopic supports are connected together, and at least one steel formwork is installed on each telescopic support. The adjacent steel formworks are hingedly connected together around the longitudinal axis to form the first top die 3.

[0060] The telescopic supports form a top die support 5 which is provided between the telescopic beam 2 and the telescopic oil cylinder 7 for adjusting the center line of the first top die 3. The telescopic oil cylinder 7 is arranged in the transverse direction, one end of which is fixed to the telescopic beam 2, and the other end of which is fixed to the top die support 5. When the center line of the first top die 3 needs to be adjusted, the first top die 3 is transversely adjusted by driving the telescopic oil cylinder 7, so that the center line of the first top die 3 is in the designed position. After the adjustment is completed, the supports at both ends of the telescopic oil cylinder 7 are fixed to the top die support 5 and the telescopic beam 2 through the bolt structure.

[0061] The adjustment between the first side die 4 and the telescopic leg 1 is realized through the first connecting lead screw 6.

[0062] When applied to small tunnels, adjust the telescopic oil cylinder 7 and the first connecting lead screw 6 in the trolley unit, adjust the first top die 3 and the first side die 4 to the design position; when applied to medium-sized tunnels, the telescopic cross beam 2 and the telescopic supporting leg 1 need to be adjusted, and the telescopic oil cylinder 7 and the first connecting lead screw 6 are adjusted at the same time, so that the first top die 3 and the first side die 4 adapt to the medium-sized tunnel. That is, the telescopic oil cylinder 7 and the first connecting lead screw 6 are the fine adjustment of the trolley unit, and the telescopic cross beam 2 and the telescopic supporting leg 1 are the large-scale adjustment of the trolley unit.

[0063] When the small tunnel is switched to the medium-sized tunnel, the single-column formwork trolley needs to be adjusted in width and height, and the trolley unit needs to be temporarily supported for specific adjustment. In this embodiment, a supporting stool is installed at the lower end of the telescopic supporting leg 1, so that the telescopic supporting leg 1 is suspended on the track, the length of the telescopic supporting leg 1 is adjusted to make the first top die 3 fit the top of the tunnel, the length of the first connecting lead screw 6 is adjusted to make the first side die 4 fit the side of the tunnel, and after the adjustment is completed, the supporting stool is removed, and the lower end of the telescopic supporting leg 1 is supported on the track again, so that the width and height adjustment of the single-column formwork trolley is completed.

[0064] In a further embodiment of the present application, the construction method of the present embodiment needs to split the single-column formwork trolley into parallel formwork trolleys when applied to large tunnels. Fig. 3 As shown in the figure, when switching to a large tunnel, the connection between the two groups of trolley units in the longitudinal direction of the single-column trolley structure is released, and one of the two groups of trolley units is moved to the other side of the tunnel along the transverse direction to form a double-column formwork trolley arranged in parallel along the transverse direction of the tunnel, a disc buckle support 15 is built based on the two groups of trolley units, a second top die 16 is arranged on the disc buckle support 15, and a second side die is arranged on the side of the disc buckle support 15 and the two groups of trolley units.

[0065] One of the two groups of trolley units is translated to the other side of the two third rails 12 by the jack and / or the translation trolley structure, and the two groups of trolley units are arranged in parallel along the transverse direction to form a parallel formwork trolley structure. The disc buckle support 15 is built on the parallel formwork trolley, which serves as the bearing foundation of the disc buckle support 15, and then the second top die 16 and the second side die are installed to realize the large tunnel lining concrete pouring construction.

[0066] The purpose of building the disc buckle support 15 based on the parallel formwork trolley is to facilitate the subsequent movement of the entire disc buckle support 15 along the longitudinal direction of the tunnel, and the trolley unit itself can travel along the third rail 12. The specific disc buckle support 15 building method is to arrange a plurality of support rods 10 on the two groups of trolley units, arrange a plurality of vertical columns 11 on the tunnel floor between the two groups of trolley units, install a base 14 on the upper end of the support rod 10 and the vertical column 11, and build the disc buckle support 15 on the base 14.

[0067] The lower end of the stand column 11 is supported on the fourth track 13, and the stand column 11 itself is similar in structure to the telescopic legs 1 and can be vertically telescoped. The lower end of the stand column 11 is provided with a second driving wheel, and the stand column 11 can be driven to move along the fourth track 13 through the second driving wheel. Under the cooperation of the stand column 11 and the two side trolley units, the entire disc buckle support 15 can be conveniently driven to move longitudinally along the tunnel, so that the continuous pouring of the tunnel lining concrete can be realized.

[0068] In order to ensure the stability of the disc buckle support 15 structure, the telescopic legs 1 of the two trolley units are provided with the support rods 10 at the upper end, and the stand column 11 that can move longitudinally is arranged on the tunnel floor between the two trolley units. The telescopic legs 1 are the support carriers of the entire trolley structure, and the support rods 10 are built on the telescopic legs 1, so that the subsequent disc buckle support 15 has better stability. Since the transverse width of the large tunnel is large, the transverse spacing between the two trolley units in the parallel formwork trolley structure is large. By arranging the stand column 11, the middle position of the disc buckle support 15 can be strengthened, so that the problem of collapse of the disc buckle support 15 to the middle can be avoided.

[0069] The formwork structure of the large tunnel and the small tunnel and the medium-sized tunnel has changed. The top form and the side form of the small tunnel and the medium-sized tunnel are both installed on the trolley unit, and the top form and the side form of the large tunnel are mostly installed on the disc buckle support 15. Fig. 3 As shown in the figure, after the disc buckle support 15 is built, the second top form 16 is installed on the top of the disc buckle support 15, the third side form 17 is installed on the side of the disc buckle support 15 and the side of the support rod 10 through the second connecting screw rod 18, and the first side form 4 on the side of the trolley unit is adjusted, so that the first side form 4 and the third side form 17 are combined to form the second side form corresponding to the side wall of the large tunnel.

[0070] The second top form 16 of the large tunnel is built according to the disc buckle support 15 of the same shape according to the structure of the top of the large tunnel, and then the second top form 16 is arranged on the top of the disc buckle support 15. The second side form of the large tunnel includes the third side form 17 on the side of the disc buckle support 15 and the support rod 10, and part of the first side form 4, and part of the first side form 4 connects the third side form 17 to jointly constitute the second side form suitable for the side wall of the large tunnel.

[0071] In the actual application process, it is not limited to the mode of switching from a small tunnel to a medium-sized tunnel and then to a large tunnel. It can be switched from a large tunnel to a medium-sized tunnel and then to a small tunnel. The switching mode from small to large can be performed in the above-mentioned manner, and the switching mode from large to small can be performed in the reverse manner according to the above-mentioned manner. For example, when the large tunnel is switched to the medium-sized tunnel, the disc buckle support can be removed after the large tunnel lining concrete pouring is completed, and then the parallel formwork trolley is converted to the single formwork trolley, and then enters the medium-sized tunnel.

[0072] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for continuous variable cross-section tunnel lining concrete casting construction, characterized in that: According to the following steps: S1, pouring the bottom plate at the bottom of the tunnel, laying the track according to the tunnel section; S2, assembling two groups of trolley units in the tunnel, and connecting the two groups of trolley units in the longitudinal direction to form a single-column formwork trolley structure; S3, driving the single-column formwork trolley to move to the tunnel lining concrete pouring construction position along the track, and adjusting the formwork trolley according to the tunnel section of the construction position; S4, pouring the tunnel lining concrete based on the adjusted formwork trolley, demolding after the poured concrete reaches the design strength, moving the formwork trolley to the next construction position for construction, and repeating the process until all construction positions in the tunnel are completed; The method of adjusting the formwork trolley according to the tunnel section of the construction position includes: for small tunnels, using a single-column formwork trolley formed by arranging two groups of trolley units in the longitudinal direction for concrete pouring construction; for medium-sized tunnels, adjusting the width and height of the single-column formwork trolley composed of two groups of trolley units for concrete pouring construction; for large tunnels, arranging two groups of trolley units in parallel along the transverse direction of the tunnel to form a double-column formwork trolley for concrete pouring construction; The cross-sectional area of the small tunnel is smaller than that of the medium-sized tunnel, and the cross-sectional area of the medium-sized tunnel is smaller than that of the large tunnel; In step S2, the method of assembling two groups of trolley units in the tunnel includes: building telescopic legs on two tracks, arranging telescopic crossbeams on the upper end of the telescopic legs to form a trolley gantry, arranging a first top die on the telescopic crossbeams, and arranging a first side die on the side of the telescopic legs through a plurality of first connecting lead screws to form a group of trolley units, building another group of trolley units in front of or behind the trolley unit in the longitudinal direction, and connecting the two groups of trolley units in the longitudinal direction to form a single-column formwork trolley; For large tunnels, the connection between the two groups of trolley units in the longitudinal direction of the single-column trolley structure is released, one of the two groups of trolley units is moved to the other side of the tunnel in the transverse direction, a double-column formwork trolley is formed by arranging the two groups of trolley units in parallel along the transverse direction of the tunnel, a disc buckle support is built based on the two groups of trolley units, and a second top die is arranged on the disc buckle support; The method of building a disc buckle support based on two groups of trolley units includes: arranging a plurality of support rods on the two groups of trolley units, arranging a plurality of columns on the tunnel bottom plate between the two groups of trolley units, and installing a base on the upper end of the support rods and the columns, and building a disc buckle support on the base; After the disc buckle support is built, a second top die is installed on the top of the disc buckle support, a third side die is installed on the side of the disc buckle support and the side of the support rod through a second connecting lead screw, and the first side die on the side of the trolley unit is adjusted so that the first side die and the third side die combine to form a second side die corresponding to the side wall of the large tunnel.

2. A method of continuously casting a variable cross-section tunnel lining according to claim 1, wherein: The support rods are installed on the upper end of the telescopic legs of the two groups of trolley units, and the columns are arranged on the tunnel bottom plate between the two groups of trolley units, which can move in the longitudinal direction.

3. A method of continuously casting a variable cross-section tunnel lining according to claim 1, wherein: The method for adjusting the width and height of the single-line form trolley composed of two groups of trolley units comprises the following steps: installing a support stool at the lower end of the telescopic leg, suspending the telescopic leg on the track, adjusting the length of the telescopic leg, making the first top die fit the top of the tunnel, adjusting the length of the first connecting screw rod, making the first side die fit the side of the tunnel, after the adjustment is completed, removing the support stool, and supporting the lower end of the telescopic leg on the track again to complete the adjustment of the width and height of the single-line form trolley.

4. A method of continuously casting a variable cross-section tunnel lining according to claim 1, wherein: In the step S1, the method for laying the track according to the tunnel section comprises the following steps: for a small tunnel, laying two first tracks extending along the longitudinal direction of the tunnel on the bottom plate near the side wall of the tunnel; for a medium tunnel, laying two second tracks extending along the longitudinal direction of the tunnel on the bottom plate near the side wall of the tunnel; for a large tunnel, laying four third tracks extending along the longitudinal direction of the tunnel on the bottom plate near the side wall of the tunnel, and laying a plurality of fourth tracks extending along the longitudinal direction of the tunnel on the bottom plate in the middle of the tunnel.

5. A method of continuously casting a variable cross-section tunnel lining according to claim 1, wherein: The method for arranging the first top die on the telescopic beam comprises the following steps: installing a top die support on the telescopic beam, the top die support comprising a plurality of telescopic supports connected together and capable of being adjusted in the transverse direction, and installing at least one steel form on each telescopic support, and the adjacent steel forms being connected together by hinging around the longitudinal axis to form the first top die.

6. A method of continuously casting a variable cross-section tunnel lining according to claim 1, wherein: The small tunnel is a tunnel with a cross-sectional area of 1 times, the medium tunnel is a tunnel with a cross-sectional area of 1-1.3 times, and the large tunnel is a tunnel with a cross-sectional area of more than 2 times.

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