Composite steel formwork for layered pouring of inverted arch

Abstract

The present invention discloses a composite steel formwork for layered casting of an inverted arch, comprising a left side arc steel formwork, a right side arc steel formwork and an end steel formwork, wherein the left side arc steel formwork and the right side arc steel formwork respectively comprise an arc formwork and a vertical straight formwork, the arc formwork and the vertical straight formwork are connected through a first hinge seat, and the surface of the arc formwork forms an arc surface that matches the inverted arch casting curve in the tunnel construction design; the end steel formwork is composed of a left side positioning end formwork, a plurality of common end forms and a right side positioning end formwork that are connected in sequence, the left side arc steel formwork and the right side arc steel formwork are respectively erected and fixed on the left side positioning end formwork and the right side positioning end formwork, and the left side positioning end formwork and the right side positioning end formwork are respectively provided with an arc positioning notch that matches the left side arc steel formwork and the right side arc steel formwork. The present invention has the characteristics of simple structure, convenient and effective operation, and can reduce the amount of steel bars used.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, in particular to an inverted arch layered casting combined steel formwork. Background Art

[0002] At present, the construction of the secondary lining of the tunnel needs to be carried out in layers of invert and invert backfill according to the design requirements. The invert in the tunnel arch foot area needs to be cast into an arc shape to form a complete closed circle for the tunnel lining structure, so that the force is more uniform, thereby improving the bearing capacity of the tunnel lining structure. However, during the actual on-site construction process, due to the shortcomings of the simple arc formwork being difficult to locate and fix, a large number of steel bars are required for its fixation, and the invert casting effect is often poor, or even unable to be cast into an arc shape, which cannot meet the design requirements and poses a major quality risk. Summary of the invention

[0003] In order to overcome the shortcomings mentioned in the prior art, the object of the present invention is to provide a composite steel formwork for layered casting of an invert which has a simple structure, is easy to operate, is effective and can reduce the amount of steel bars used.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: a composite steel formwork for layered casting of an inverted arch comprises a left-side arc steel formwork, a right-side arc steel formwork and an end steel formwork, wherein the left-side arc steel formwork and the right-side arc steel formwork respectively comprise an arc formwork and a vertical straight formwork, the arc formwork and the vertical straight formwork are connected through a first hinge seat, and the surface of the arc formwork forms an arc surface that matches the inverted arch casting curve in the tunnel construction design; the end steel formwork consists of a left-side positioning end formwork, a plurality of common end forms and a right-side positioning end formwork that are connected in sequence, the left-side arc steel formwork and the right-side arc steel formwork are respectively mounted and fixed on the left-side positioning end formwork and the right-side positioning end formwork, and the left-side positioning end formwork and the right-side positioning end formwork are respectively provided with arc positioning notches that match the left-side arc steel formwork and the right-side arc steel formwork.

[0005] Furthermore, the lower parts of the left positioning end mold, the right positioning end mold and all the common end molds are provided with a "Z"-shaped stepped portion, and the left positioning end mold, the right positioning end mold and all the common end molds are arranged on the same horizontal plane.

[0006] Furthermore, the left positioning end mold and the common end mold, the right positioning end mold and the common end mold and two adjacent common end molds are fixed by latches, which is convenient for disassembly and installation.

[0007] Furthermore, the arc-shaped template and the vertical straight template are respectively provided with an upper longitudinal beam, a middle longitudinal beam and a lower longitudinal beam, and a plurality of cross beams are arranged at intervals between the upper longitudinal beam, the middle longitudinal beam and the lower longitudinal beam for fixing.

[0008] Furthermore, a load-bearing longitudinal beam is provided between the arc-shaped template and the vertical straight template, and the load-bearing longitudinal beam is respectively connected to the upper part and the middle part of the arc-shaped template through two connecting rods, and the load-bearing longitudinal beam is connected to the upper part of the vertical straight template through a bidirectional screw. One end of the bidirectional screw is connected to the load-bearing longitudinal beam through a second capstan, and the other end of the bidirectional screw is connected to the vertical straight template through a third capstan, and the center axis of the load-bearing longitudinal beam and the rotation center of the third capstan are both on a rotation plane with the center line of the first capstan connection as the axis.

[0009] Furthermore, the connecting rod and the bidirectional lead screw are arranged at intervals in the longitudinal direction, the number of the bidirectional lead screws is two, and they are arranged symmetrically up and down with the midpoint of the central axis of the load-bearing longitudinal beam as the center.

[0010] Furthermore, the left positioning end mold, the right positioning end mold and the common end mold are respectively provided with vertically and horizontally distributed skeletons to enhance the structural stability.

[0011] Furthermore, two movable support rods are respectively provided on the left positioning end mold, the right positioning end mold and the common end mold, one end of the movable support rod is connected to the left positioning end mold or the right positioning end mold or the common end mold through a fourth capstan, and the other end is connected to the tray through a fifth capstan. The movable support rod is composed of two mutually sleeved steel pipes, and the two steel pipes are respectively provided with adjustment holes, and the adjustment holes are installed with fixing screws that can adjust the overall length of the two steel pipes.

[0012] The beneficial effects of the present invention are as follows: the present invention has the characteristics of simple structure, convenient operation, stability and effectiveness; the present invention consists of a left-side arc-shaped steel formwork, a right-side arc-shaped steel formwork and an end steel formwork, the left-side arc-shaped steel formwork and the right-side arc-shaped steel formwork are respectively fixed to the end steel formwork, the formwork structure is simple, the construction is convenient, and the fixing is quick.

[0013] When the invert is being poured, the concrete will be poured into the designed arc shape along the stainless steel panel of the arc formwork in the tunnel arch foot area. After the invert concrete solidifies and reaches the designed strength, the invert is directly filled between the vertical straight formworks of the left and right arc steel formworks. After the invert is filled, the invert arc formwork and the pouring surface can be directly separated by a two-way screw rod, so as to achieve the purpose of rapid layered construction of the invert. At the same time, the end steel formwork is designed with a "Z"-shaped step at the bottom, which is used to pour into a step shape at the end position when pouring the invert, so that the construction joints of the invert pouring and filling are not in the same longitudinal section when pouring the invert twice before and after, thereby improving the waterproof ability of the invert. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a top view of the overall structure of the present invention;

[0015] Figure 2 for Figure 1 A front view of

[0016] Figure 3 for Figure 1 Front view of the curved steel formwork on the left side of the center;

[0017] Figure 4 for Figure 1 Top view of the curved steel formwork on the left side of the center;

[0018] Figure 5 for Figure 1 Front view of the curved steel formwork on the right side of the center;

[0019] Figure 6 for Figure 1 Top view of the curved steel formwork on the middle right;

[0020] Figure 7 for Figure 2 Front view of the positioning end mold on the left side of the middle;

[0021] Figure 8 for Figure 2 Front view of the positioning end mold on the right side of the middle;

[0022] Fig. 9 for Figure 2 Front view of the middle common end mold;

[0023] Fig.10 for Figure 2 Left view of the middle common end mold;

[0024] Fig.11 for Figure 2 Left view of the left positioning end mold;

[0025] Fig.12 for Fig.11 Schematic diagram of the structure of the movable support rod. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 12 As shown, the layered casting composite steel formwork of the inverted arch is composed of a left-side arc-shaped steel formwork 1, a right-side arc-shaped steel formwork 2 and an end steel formwork 3; the left-side arc-shaped steel formwork 1 and the end steel formwork 3 are erected and fixed, and the right-side arc-shaped steel formwork 2 and the end steel formwork 3 are erected and fixed.

[0028] like Figure 3 to Figure 6As shown, the left-side arc steel formwork 1 and the right-side arc steel formwork 2 are symmetrically arranged, respectively including an arc formwork 7 and a vertical straight formwork 8, and the lower parts of the arc formwork 7 and the vertical straight formwork 8 are connected by a first hanger 101; the upper, middle and lower parts of the arc formwork 7 and the vertical straight formwork 8 are respectively provided with an upper longitudinal beam 10, a middle longitudinal beam 11 and a lower longitudinal beam 12, and cross beams 17 are arranged at intervals between the upper longitudinal beam 10, the middle longitudinal beam 11 and the lower longitudinal beam 12 for fixing; wherein, a load-bearing longitudinal beam 13 is also provided between the arc formwork 7 and the vertical straight formwork 8, and the upper longitudinal beam 10 and the middle longitudinal beam 11 of the upper and middle parts of the arc formwork 7 are connected to the load-bearing longitudinal beam 13 through a connecting rod 14, and the load-bearing longitudinal beam 13 is connected to the upper longitudinal beam 10 of the vertical straight formwork 8 through a bidirectional screw 15. Among them, one end of the bidirectional screw 15 is connected to the load-bearing longitudinal beam 102 through the second capstan, and the other end of the bidirectional screw 15 is connected to the vertical straight formwork through the third capstan 103. The center axis of the load-bearing longitudinal beam 13 and the rotation center of the third capstan 103 are both on the rotation plane with the connection center line of the first capstan 101 as the axis. Before the inverted arch is cast, the bidirectional screw 15 is adjusted to make the arc formwork 7 rotate around the first capstan 101 so that the curvature and angle of the arc formwork 7 meet the design requirements; after the inverted arch is cast, the bidirectional screw 15 is adjusted to make the arc formwork 7 rotate around the first capstan 101 so that the arc formwork 7 is separated from the concrete casting surface.

[0029] like Figure 3 to Figure 6 As shown, the arc curve of the arc formwork 7 is consistent with the invert casting curve in the tunnel construction design, and the panels 16 of the arc formwork 7 and the vertical straight formwork 8 are made of stainless steel plates.

[0030] like Figure 1 to Figure 4 As shown, the connecting rod 14 is arranged along the longitudinal interval cross beam 17, and two bidirectional screws 15 are symmetrically arranged along the longitudinal direction with the midpoint of the central axis of the load-bearing longitudinal beam 13 as the center, so that the structure is more stable.

[0031] like Figure 2 , Figure 7 to Figure 11 As shown, the end steel template 3 is composed of a left-side positioning end template 4, a plurality of common end templates 6 and a right-side positioning end template 5 which are connected in sequence. The left-side positioning end template 4 and the right-side positioning end template 5 are respectively provided with arc-shaped positioning notches, and the arc shape of the positioning notches is the same as the nominal size of the arc template 7 of the left-side arc-shaped steel template 1 and the right-side arc-shaped steel template 2.

[0032] like Figure 2 , Figure 7 to Figure 11As shown, the left positioning end mold 4, the right positioning end mold 5 and the common end mold 6 are all provided with a skeleton 18 arranged horizontally and vertically, and are respectively provided with two movable support rods 19, one end of the movable support rod 19 is connected to the skeleton 18 on the left positioning end mold or the right positioning end mold or the common end mold through the fourth hanger 104, and the other end is connected to the tray 20 through the fifth hanger 105. Among them, the movable support rod 19 is composed of two mutually sleeved steel pipes 21, and the two steel pipes are respectively provided with adjustment holes 22, and the adjustment holes 22 are installed with fixing screws 23 that can adjust the overall length of the two steel pipes. When the left positioning end mold 4, the right positioning end mold 5 and the common end mold 6 are installed, the sleeve length of the steel pipe 21 is adjusted by loosening and tightening the fixing screws 23, thereby adjusting the length of the movable support rod 19, so that the tray 20 connected to its end is in contact with the ground, which plays a role in fixing and supporting the left positioning end mold 4, the right positioning end mold 5 and the common end mold 6.

[0033] like Figure 2 , Figure 7 to Figure 11 As shown, the lower parts of the left positioning end mold 4, the right positioning end mold 5 and the common end mold 6 are all provided with a "Z"-shaped stepped portion, and two adjacent molds are fixed by a latch 24, and the "Z" shape of the bottom of all molds is at the same level ( Figure 2 The middle dotted line indicates that the step portions 201 are on the same horizontal plane).

[0034] Compared with the prior art, this specific implementation has the following positive effects:

[0035] The present invention consists of a left-side arc-shaped steel template 1, a right-side arc-shaped steel template 2 and an end steel template 3; the left-side arc-shaped steel template 1 and the end steel template 3 are erected and fixed, and the right-side arc-shaped steel template 2 and the end steel template 3 are erected and fixed. The template structure is simple, the construction is convenient, and the fixing is quick.

[0036] The left side arc steel formwork 1 and the right side arc steel formwork 2 of the specific embodiment of the present invention are respectively provided with an arc formwork 7 and a vertical straight formwork 8, and the lower parts of the arc formwork 7 and the vertical straight formwork 8 are connected by a hanger seat 9; the upper longitudinal beam 10 and the middle longitudinal beam 11 of the arc formwork 7 are connected with the load-bearing longitudinal beam 13 through a connecting rod 14, and the load-bearing longitudinal beam 13 is connected with the upper longitudinal beam 10 of the vertical straight formwork 8 through a bidirectional screw 15. When the inverted arch is cast, the concrete will be cast into a designed arc along the stainless steel panel of the arc formwork in the tunnel arch foot area, and after the inverted arch cast concrete solidifies and reaches the design strength, the inverted arch is directly filled between the vertical straight formworks of the left and right side arc steel formworks, thereby achieving the purpose of rapid layered construction of the inverted arch. At the same time, the end steel formwork is designed into a "Z" shape at the bottom, and the end position is cast into a step shape when the inverted arch is cast, so that the construction joints of the inverted arch casting and the inverted arch filling are not in the same longitudinal section when the inverted arch is cast twice before and after, thereby improving the waterproof ability of the inverted arch.

[0037] The present invention fixes the left and right curved steel forms to the end steel forms respectively, and casts the inverted arch into a designed arc in the tunnel arch foot area, thereby improving the bearing capacity of the tunnel lining structure; and casts the inverted arch end into a step shape, thereby improving the waterproofing ability of the inverted arch. Therefore, the present invention has the characteristics of simple structure, convenient and effective operation.

[0038] The above is only a preferred embodiment of the present invention, and should not be used to limit the scope of the present invention. That is, all simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention description of the present invention are still within the scope of the patent of the present invention.

Claims

1. The combined steel formwork for layered casting of inverted arch is characterized by: It comprises a left-side arc steel formwork, a right-side arc steel formwork and an end steel formwork, wherein the left-side arc steel formwork and the right-side arc steel formwork respectively comprise an arc formwork and a vertical straight formwork, the arc formwork and the vertical straight formwork are connected by a first hinge seat, and the surface of the arc formwork forms an arc surface which matches the inverted arch casting curve in the tunnel construction design; the end steel formwork is composed of a left-side positioning end formwork, a plurality of common end forms and a right-side positioning end formwork which are connected in sequence, the left-side arc steel formwork and the right-side arc steel formwork are respectively erected and fixed on the left-side positioning end formwork and the right-side positioning end formwork, and the left-side positioning end formwork and the right-side positioning end formwork are respectively provided with an arc-shaped positioning notch which matches the left-side arc steel formwork and the right-side arc steel formwork; a load-bearing longitudinal beam is also provided between the arc formwork and the vertical straight formwork, and the load-bearing longitudinal beam is respectively connected to the left-side positioning end formwork and the right-side positioning end formwork by two connecting rods The upper and middle parts of the arc formwork are connected, the load-bearing longitudinal beam is connected to the upper part of the vertical straight formwork through a two-way screw, one end of the two-way screw is connected to the load-bearing longitudinal beam through a second capstan, and the other end of the two-way screw is connected to the vertical straight formwork through a third capstan, the center axis of the load-bearing longitudinal beam and the rotation center of the third capstan are both on a rotation plane with the first capstan connection center line as the axis, the connecting rod and the two-way screw are arranged at intervals along the longitudinal direction, the number of the two-way screws is two, and they are symmetrically arranged up and down with the midpoint of the center axis of the load-bearing longitudinal beam as the center; before the inverted arch is cast, the arc formwork can be rotated around the first capstan by adjusting the two-way screw, so that the curvature and angle of the arc formwork meet the design requirements; after the inverted arch is cast, the arc formwork can be rotated around the first capstan by adjusting the two-way screw, so that the arc formwork is separated from the concrete casting surface.

2. The inverted arch layered casting composite steel formwork according to claim 1 is characterized in that: The lower parts of the left positioning end mold, the right positioning end mold and all the common end molds are provided with stepped parts.

3. The inverted arch layered casting composite steel formwork according to claim 2 is characterized in that: The stepped portions of the left positioning end mold, the right positioning end mold and all the common end molds are arranged on the same horizontal plane.

4. The inverted arch layered casting composite steel formwork according to claim 1 is characterized in that: The left positioning end mold and the common end mold, the right positioning end mold and the common end mold and two adjacent common end molds are fixed by latches.

5. The inverted arch layered casting composite steel formwork according to claim 1 is characterized in that: The arc-shaped template and the vertical straight template are respectively provided with an upper longitudinal beam, a middle longitudinal beam and a lower longitudinal beam, and a plurality of cross beams are arranged at intervals between the upper longitudinal beam, the middle longitudinal beam and the lower longitudinal beam for fixing.

6. The inverted arch layered casting composite steel formwork according to claim 1 is characterized in that: The left-side positioning end mold, the right-side positioning end mold and the common end mold are respectively provided with skeletons distributed vertically and horizontally, and two movable support rods are also respectively provided on the left-side positioning end mold, the right-side positioning end mold and the common end mold. One end of the movable support rod is connected to the left-side positioning end mold, the right-side positioning end mold or the common end mold through the fourth hinge seat, and the other end is connected to the tray through the fifth hinge seat.

7. The inverted arch layered casting composite steel formwork according to claim 6 is characterized in that: The movable support rod is composed of two steel pipes which are sleeved with each other. The two steel pipes are respectively provided with adjustment holes. The adjustment holes are equipped with fixing screws which can adjust the overall length of the two steel pipes.

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