Half-range formwork for tunnel inverted arch flow construction

Abstract

The utility model provides a half-range formwork for tunnel inverted arch flow construction, the half-range formwork comprises a single-plate inverted arch and a lengthened plate inverted arch which are sequentially connected from front to back, the single-plate inverted arch comprises a first longitudinal beam and an arc-shaped formwork, and the arc-shaped formwork is arranged on one side of the first longitudinal beam and located below the first longitudinal beam; the lengthened plate inverted arch comprises a second longitudinal beam and a filling side formwork, and the filling side formwork is arranged on one side of the second longitudinal beam and located below the second longitudinal beam; the first longitudinal beam and the second longitudinal beam are horizontally connected end to end; the filling side die is provided with a supporting framework. By means of the half-range formwork, construction efficiency can be improved, flow construction among inverted arch steel bars, inverted arches and inverted arch filling procedures is achieved, large vehicles can pass through a trestle at will during inverted arch construction, and safety risks are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnels and underground engineering, and in particular to a half-width template for tunnel invert water flow construction. Background Art

[0002] There are two main types of tunnel invert construction formwork: one is the full-width formwork, which can realize the streamlined operation of each invert process, but this type of formwork is heavy, and heavy vehicles generally cannot be driven on the invert trestle when the full-width formwork slides, which poses a certain safety risk; the other is the half-width formwork, which is light in weight, but generally cannot realize the streamlined operation of each invert process, which has a certain impact on construction efficiency.

[0003] The requirements for mechanization and standardization of tunnel construction are becoming increasingly higher, and the self-propelled inverted arch trestle formwork has become one of the necessary tools for tunnel construction. At present, there are many types of inverted arch trestles, but generally speaking, they can be divided into two categories: one is the construction process of self-propelled inverted arch trestles and inverted arch full-width formwork integration. This type of inverted arch trestle full-width formwork can slide back and forth on the main bridge to achieve flow construction between the inverted arch reinforcement, inverted arch, and inverted arch filling processes. However, the full-width formwork is heavy, and there is a great safety risk when large vehicles pass through the trestles when the formwork slides, and the inverted arch construction quality is greatly affected by the vibration of the trestles when passing by vehicles. The second is the construction process of self-propelled inverted arch trestles and inverted arch half-width formwork separation. This type of inverted arch trestle half-width formwork mainly relies on the front end beam of the formwork to connect the two formworks into a whole, which is suspended on the main bridge, and a walking mechanism is set at the tail end to walk in the side ditch after the inverted arch is filled and poured.

[0004] The half-width formwork and the trestle are independent systems, and the movement and construction do not interfere with each other, which can prevent the vibration of the trestle when the car passes on the bridge from affecting the construction quality. The formwork is self-demolding, and the chain carriage on the trestle can drag the formwork to move and position as a whole, saving time and easy operation. The half-width formwork is light in weight and has low safety risks, but the movement of the formwork needs to wait until the invert filling reaches the strength after pouring, which takes a lot of time, and it cannot realize the flow construction between the invert reinforcement, invert, and invert filling processes, and the construction efficiency is low.

[0005] At present, all kinds of inverted arch trestles cannot solve the two difficulties of inverted arch construction at the same time: 1. Realize the flow construction between the inverted arch reinforcement, inverted arch, and inverted arch filling processes; 2. Large vehicles can pass freely on the trestles during the inverted arch construction to reduce safety risks. Therefore, it is necessary to study and break through the inherent form of the existing conventional inverted arch trestles, and innovate a new type of inverted arch trestles with the characteristics of full-width formwork and half-width formwork. Therefore, it is of great significance to provide a half-width formwork for the flow construction of tunnel inverted arches.

[0006] The Chinese patent with application number "CN202020440374.6" and name "lining support system for tunnel section reconstruction tunnel bottom structure" discloses a lining support system for tunnel section reconstruction tunnel bottom structure, which includes an invert lining and initial support set at the tunnel bottom, steel flower pipe lock feet driven into the surrounding rock by the side walls on both sides, and blocking isolation walls and pre-reinforced piles located above and below the central ditch, respectively. The invert lining includes two half-width invert linings symmetrically arranged along the transverse direction of the tunnel, and the initial support includes two half-width initial supports symmetrically arranged along the transverse direction of the tunnel. The pre-reinforced piles are respectively consolidated with the two half-width invert linings and the two half-width initial supports. The tunnel invert construction template structure of this utility model is different from that of this application. Utility Model Content

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to solve one or more problems in the prior art. For example, one of the purposes of the present invention is to provide a half-width formwork for tunnel invert flow construction that realizes zero-connection construction between invert reinforcement, invert, and invert filling processes, large vehicles can pass freely on the trestle during construction, and is low-cost, safe and reliable.

[0008] In order to achieve the above-mentioned purpose, the utility model provides, on the one hand, a half-width formwork for the flowing construction of a tunnel invert, wherein the half-width formwork may include a single-plate invert and an extended plate invert connected in sequence front to back, wherein the single-plate invert includes a first longitudinal beam and an arc-shaped formwork, the arc-shaped formwork is arranged on one side of the first longitudinal beam and is located below the first longitudinal beam; the extended plate invert includes a second longitudinal beam and a filling side formwork, the filling side formwork is arranged on one side of the second longitudinal beam and is located below the second longitudinal beam; the first longitudinal beam is horizontally connected to the second longitudinal beam end to end; and the filling side formwork is a filling side formwork with a supporting frame.

[0009] According to one or more exemplary embodiments of one aspect of the utility model, the supporting frame may include a filling side form support plate, a filling side form vertical connector and a filling side form transverse connector; the filling side form transverse connector connects the filling side form support plate and the filling side form; the filling side form vertical connector is arranged between the second longitudinal beam and the filling side form transverse connector and is perpendicular to the filling side form transverse connector; the filling side form transverse connector is arranged in a horizontal line direction.

[0010] Furthermore, the supporting frame may include a plurality of filling side formwork support plates, and the filling side formwork support plates may be arranged at intervals of 1.5 to 2 m along the length direction of the extended plate invert arch.

[0011] According to one or more exemplary embodiments of one aspect of the utility model, the single-plate arch may also include a curved formwork transverse connector and a curved formwork vertical connector; the curved formwork transverse connector connects the curved formwork and the first longitudinal beam; the curved formwork vertical connector connects the curved formwork bottom formwork and the first longitudinal beam.

[0012] According to one or more exemplary embodiments of an aspect of the present invention, a lap portion may be provided at the rear end of the half-width template.

[0013] Furthermore, the length of the overlapping portion may be 0.1 to 0.2 m.

[0014] According to one or more exemplary embodiments of one aspect of the utility model, a front end cross beam may be provided at the front end of the half-width formwork; and a walking mechanism may be provided at the rear end of the half-width formwork.

[0015] According to one or more exemplary embodiments of an aspect of the present invention, the length of the single-plate invert may be 6 to 12 m.

[0016] According to one or more exemplary embodiments of an aspect of the present invention, the length of the extended plate invert may be 6 to 12 m.

[0017] According to one or more exemplary embodiments of an aspect of the present invention, the single-board inverted arch and the extended-board inverted arch may have the same length.

[0018] Compared with the prior art, the beneficial effects of the utility model include at least one of the following:

[0019] (1) The half-width template of the present invention is light in weight and has low cost compared to the full-width template of the same length.

[0020] (2) The utility model adopts a split structure of an inverted arch main bridge and a half-width formwork. The proposed half-width formwork can achieve fast and efficient construction. During the inverted arch construction, large vehicles can pass freely on the trestle. The movement of the half-width formwork does not affect the passage of heavy vehicles on the main bridge. The upper and lower parts of the main bridge do not affect each other, which is safe, reliable and low-risk.

[0021] (3) The half-width formwork of the utility model has high flow construction efficiency. The half-width formwork can realize the simultaneous construction of the invert and the invert filling of the adjacent segment, avoiding the large amount of time wasted in the past when the half-width formwork had to be cast after the same plate of invert and the invert filling had been cast, and the invert filling had to have walking strength before the formwork could be walked. The half-width formwork can achieve zero connection between the invert reinforcement, invert and invert filling processes, and the invert of each segment can be constructed in a flow and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects and features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0023] Figure 1 The schematic diagram of the structure of the half-width template of the utility model is shown;

[0024] Figure 2A cross-sectional view of an inverted arch filling section of a half-width formwork of the utility model is shown;

[0025] Figure 3 The cross-sectional view of the inverted arch segment of the half-width formwork of the utility model is shown.

[0026] Reference numerals:

[0027] 1-longitudinal beam, 2-filling side formwork, 21-filling side formwork support plate, 22-filling side formwork vertical connector, 23-filling side formwork horizontal connector, 3-arc formwork, 31-arc formwork horizontal connector, 32-arc formwork vertical connector. DETAILED DESCRIPTION

[0028] Hereinafter, a half-width formwork for tunnel invert water construction of the present invention will be described in detail in conjunction with the accompanying drawings and exemplary embodiments.

[0029] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "tail", "bottom", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] The terms "first", "second", etc. are used only for the convenience of description and distinction, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" or "several" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0032] Exemplary Embodiment 1

[0033] This exemplary embodiment provides a half-width formwork for tunnel invert flowing construction.

[0034] Combine the following Figures 1 to 3To describe the half-width formwork for the tunnel invert water construction of this exemplary embodiment. It should be noted that the direction from front to back in the specification is Figure 1 Right to left direction in .

[0035] like Figure 1 to Figure 3 As shown in , the half-width formwork for the tunnel invert flow construction mainly includes a single-plate invert and an extended plate invert connected in sequence from front to back. The single-plate invert is located at the front end of the half-width formwork, and the extended plate invert is located at the rear end of the half-width formwork.

[0036] Among them, the single-board arch includes a first longitudinal beam and an arc-shaped formwork 3, and the arc-shaped formwork 3 is arranged on one side of the first longitudinal beam and located below the first longitudinal beam; the extended board arch includes a second longitudinal beam and a filling side formwork 2, and the filling side formwork 2 is arranged on one side of the second longitudinal beam and located below the second longitudinal beam; the first longitudinal beam and the second longitudinal beam are horizontally connected end to end, and can be collectively referred to as longitudinal beam 1; the filling side formwork 2 is a filling side formwork with a supporting frame.

[0037] In this exemplary embodiment, the support frame may include a filling side form support plate 21, a filling side form vertical connector 22, and a filling side form transverse connector 23. The filling side form transverse connector 23 connects the filling side form support plate 21 and the filling side form 2; the filling side form vertical connector 22 is arranged between the second longitudinal beam and the filling side form transverse connector 23 and is perpendicular to the filling side form transverse connector 23; the filling side form transverse connector 23 is arranged in a horizontal line direction. The filling side form vertical connector 22 and the filling side form transverse connector 23 can both connect the filling side form 2 and the second longitudinal beam by bolts.

[0038] In this exemplary embodiment, the single-plate inverted arch may further include an arc formwork transverse connector 31 and an arc formwork vertical connector 32. The arc formwork transverse connector 31 connects the arc formwork 3 with the first longitudinal beam; the arc formwork vertical connector 32 connects the arc formwork 3 bottom formwork with the first longitudinal beam. The arc formwork bottom formwork is horizontally set according to the side ditch width of the inverted arch side wall position to be constructed, and the horizontal width is adjusted according to the side ditch width of the inverted arch side wall position to be constructed. The arc formwork transverse connector and the arc formwork vertical connector can both connect the arc formwork with the first longitudinal beam by bolts.

[0039] In this exemplary embodiment, the filling side formwork support plate is set with an arc and an inclination, and the arc and the inclination angle are consistent with the arc of the short side wall at the inverted arch side wall position to ensure that the filling side formwork support plate fits tightly with the short side wall. The arc setting of the arc template is consistent with the arc of the short side wall at the inverted arch side wall position to be constructed. The height of the arc template is adjusted according to the height of the short side wall at the inverted arch side wall position to be constructed.

[0040] In this exemplary embodiment, a lap portion may be provided at the tail end of the half-width template, and the length of the lap portion may be 0.1 to 0.2 m.

[0041] In this exemplary embodiment, a front end cross beam may be provided at the front end of the half-width formwork, and a walking mechanism may be provided at the rear end of the half-width formwork.

[0042] In this exemplary embodiment, the length of the single plate inverted arch can be equal to the length of the extended plate inverted arch. The conventional arrangement of the single plate inverted arch and the extended plate inverted arch can be a combination of 12m+12m or a combination of 6m+6m. The length can be appropriately adjusted according to the design of the tunnel inverted arch. The length of the single plate inverted arch and the length of the extended plate inverted arch can be set to 6 to 12m.

[0043] In this exemplary embodiment, the weight of a set of half-width templates may be 40% of the weight of a full-width template of the same length and the same material.

[0044] In this exemplary embodiment, for a single-plate inverted arch, a set of vertical connectors of curved formwork and horizontal connectors of curved formwork are arranged at intervals of 1.5 to 2 m along the longitudinal beam length direction. The material used for the vertical connectors of curved formwork and the horizontal connectors of curved formwork is generally channel steel. For an extended plate inverted arch, a set of vertical connectors of infill side formwork and horizontal connectors of infill side formwork and a supporting plate of infill side formwork are arranged at intervals of 1.5 to 2 m along the longitudinal beam length direction. The material used for the vertical connectors of infill side formwork and the horizontal connectors of infill side formwork is generally channel steel.

[0045] In this exemplary embodiment, the extended plate invert may be installed with 3 to 8 support plates.

[0046] In order to better understand the above exemplary embodiments of the present invention, they are further described below with reference to specific examples.

[0047] Example 1

[0048] The half-width formwork for the tunnel invert flow construction in this example adopts the conventional 12m / plate tunnel lining structure form, abandons the heavy structure of the full-width formwork and adopts a simple and light half-width formwork. Taking the invert trestle construction area of ​​36m as an example, the half-width formwork is extended to 24.2m based on the previous half-width formwork with only one plate invert length of 12m, so that the invert and the invert filling can be poured at the same time. The front 12m of the half-width formwork is a normal half-width formwork structure (single-plate invert); the rear 12m is an invert filling side formwork structure with a supporting skeleton (extended plate invert). The panel is eliminated to reduce the weight of the formwork. 0.2m is reserved at the tail end as the template overlap (overlap part). The front crossbeam of the half-width formwork connects the 24.2m long half-width formwork on the left and right sides of the invert into a whole, which is suspended on the main bridge. The tail end of the formwork is equipped with a walking mechanism to walk in the side ditch after the invert filling is poured.

[0049] The working process / specific construction process of the half-width formwork of the utility model includes:

[0050] 1. After the first plate invert is excavated at the tunnel base, the invert trestle moves forward by the length of one plate invert (which can be 12m), and the first plate invert is supported, while the second plate invert is excavated.

[0051] 2. After the excavation of the second plate invert, the trestle moves to the second plate invert, the initial support of the second plate invert is constructed, the reinforcement of the first plate invert is tied, and the third plate invert is excavated at the same time.

[0052] 3. After the excavation of the third plate invert, the trestle moves to the third plate invert, the initial support of the third plate invert is carried out, the reinforcement of the second plate invert is tied, and the front end 12m of the half-width formwork moves to the first plate invert to close the formwork.

[0053] 4. After the first plate arch is closed, cast the arch and continue to tie the steel bars for the second plate arch.

[0054] 5. After the first slab invert is poured, the front end 12m of the half-width formwork moves to the second slab invert for formwork closing, and the rear end 12m is located at the first slab invert for invert filling and formwork closing, and the third slab invert is reinforced with steel bars.

[0055] 6. After the third plate invert reinforcement binding and the first plate invert filling and pouring are completed, the trestle and half-width formwork continue to move forward to the next plate invert, repeating the invert pouring, reinforcement binding, half-width formwork movement and invert filling and closing formwork and other similar measures in steps 4 to 5 until the streamlined operation of the 36m invert trestle is formed.

[0056] In summary, the advantages proposed by the present invention include at least one of the following:

[0057] (1) The utility model has high safety. It adopts a split structure of the inverted arch main bridge and the half-width formwork. Only the front end beam of the half-width formwork is suspended on the main bridge walking system to drag the half-width formwork for walking. The rear end walking structure is placed in the side ditch filled with the cast inverted arch for walking. The main bridge only needs to bear half the weight of the half-width formwork. When the half-width formwork is walking, it does not affect the passage of heavy vehicles on the main bridge. The upper and lower parts of the main bridge do not affect each other, which is safe and reliable.

[0058] (2) The utility model has high efficiency in flow construction. The 24m half-width formwork of the utility model can realize the simultaneous construction of the invert and the invert filling of the adjacent segment, avoiding the large amount of time wasted in the previous 12m half-width formwork, which requires the same plate of invert and the invert filling to be poured, and the invert filling to have walking strength before the formwork can be walked. The 24m half-width formwork can achieve zero connection between the invert reinforcement, invert, and invert filling processes, and the invert of each segment can be constructed in a flow and efficiently, greatly improving the construction efficiency.

[0059] (3) The cost of the solution of the utility model is low; for example, the front 12m of the 24m half-width formwork is a normal half-width formwork structure, and the rear 12m is an inverted arch filling side formwork structure with a supporting frame. The panel is eliminated to reduce the weight of the formwork. Compared with the previous inverted arch full-width formwork and inverted arch filling side formwork, the weight is greatly reduced, and the weight is only about 40% of the full-width formwork. The cost of an inverted arch trestle is reduced by about 400,000.

[0060] (4) The half-width formwork of the utility model accelerates the construction efficiency of the invert, ensuring fast and efficient construction under the condition of high progress requirements for special projects; for example, the use of a 24m invert half-width formwork can greatly accelerate the construction efficiency of the invert, and the average construction time of one plate of the invert can be saved by one day, ensuring the rapid follow-up of the invert, and reducing the safety risk caused by the large distance between the invert and the tunnel face. The 24m invert half-width formwork also has a good promotion and application value for the assembly line operation of the tunnel invert reinforcement, invert, and invert filling process.

[0061] Although the half-width formwork for tunnel invert water construction of the utility model has been described above in combination with exemplary embodiments, those skilled in the art should be aware that various modifications and changes may be made to the exemplary embodiments of the utility model without departing from the spirit and scope defined by the claims.

Claims

1. A half-width formwork for tunnel invert water construction, characterized in that: The half-width formwork includes a single plate inverted arch and an extended plate inverted arch connected in sequence front and back, wherein: The single-plate inverted arch comprises a first longitudinal beam and an arc-shaped template, wherein the arc-shaped template is arranged on one side of the first longitudinal beam and is located below the first longitudinal beam; The extended plate inverted arch comprises a second longitudinal beam and a filling side mold, wherein the filling side mold is arranged on one side of the second longitudinal beam and is located below the second longitudinal beam; The first longitudinal beam is horizontally connected to the second longitudinal beam end to end; the filling side form is a filling side form with a supporting frame.

2. The half-width formwork for tunnel invert water construction according to claim 1 is characterized in that: The supporting frame includes a filling side form support plate, a filling side form vertical connector and a filling side form transverse connector; the filling side form transverse connector connects the filling side form support plate and the filling side form; the filling side form vertical connector is arranged between the second longitudinal beam and the filling side form transverse connector and is perpendicular to the filling side form transverse connector; the filling side form transverse connector is arranged in a horizontal line direction.

3. The half-width formwork for tunnel invert water construction according to claim 2 is characterized in that: The support frame comprises a plurality of filling side formwork support plates, and the filling side formwork support plates are arranged at intervals of 1.5 to 2 meters along the length direction of the extended plate invert arch.

4. The half-width formwork for tunnel invert water construction according to claim 1 is characterized in that: The single-plate inverted arch also includes a curved template transverse connector and a curved template vertical connector; the curved template transverse connector connects the curved template and the first longitudinal beam; the curved template vertical connector connects the curved template bottom mold and the first longitudinal beam.

5. The half-width formwork for tunnel invert water construction according to claim 1 is characterized in that: The tail end of the half-width template is provided with an overlapping portion.

6. The half-width formwork for tunnel invert water construction according to claim 5, characterized in that: The length of the overlapping portion is 0.1-0.2 m.

7. The half-width formwork for tunnel invert water construction according to claim 1 or 5, characterized in that: A front end cross beam is arranged at the front end of the half-width template; and a walking mechanism is arranged at the rear end of the half-width template.

8. The half-width formwork for tunnel invert water construction according to claim 1, characterized in that: The length of the single-board inverted arch is 6 to 12 meters.

9. The half-width formwork for tunnel invert water construction according to claim 1, characterized in that: The length of the extended plate invert is 6 to 12 m.

10. The half-width formwork for tunnel invert water construction according to claim 1, characterized in that: The single-plate inverted arch is equal in length to the lengthened plate inverted arch.

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