Steel die foundation pit supporting die for hard cross beam of high-speed railway existing line contact net

Abstract

The utility model relates to the technical field of railway construction, and discloses a steel mould foundation pit supporting mould for a hard cross beam of an existing line contact net of a high-speed railway, which comprises two rectangular first connecting frames and a steel mould group, the two rectangular first connecting frames are symmetrically arranged up and down, and the steel mould group is arranged between the two first connecting frames. The steel die set comprises a pair of first steel die plates which are oppositely arranged and a pair of second steel die plates which are oppositely arranged, the first steel die plates and the second steel die plates are rectangular and are vertically arranged, and the first steel die plates and the second steel die plates are sequentially and alternately enclosed to form a rectangle; a clamping device used for vertically clamping the first steel formwork and the second steel formwork is arranged between the two first connecting frames. During assembly, the first steel formworks and the second steel formworks do not need to be connected through a large number of bolts, so that the assembly efficiency of the supporting mold can be improved, the construction progress is accelerated, and time and labor are saved.

Description

Technical Field

[0001] This utility model relates to the field of railway construction technology, and in particular to a steel mold foundation pit support mold for the rigid crossbeam of the contact wire of existing high-speed railway lines. Background Technology

[0002] The overhead contact system of a high-speed railway is a special type of power transmission line erected along the railway line to supply power to electric locomotives. It mainly consists of contact wires, catenary wires, return wires, positive feeders, and power supply lines. The foundation of the contact network support post is a crucial component of the system, and its stability directly affects the normal operation of the contact network and the safety of high-speed train operation. The foundation work typically requires excavation of pits and concrete pouring along the railway line to ensure the stability and load-bearing capacity of the supports.

[0003] The catenary support foundation is a crucial structure supporting the catenary system, and its stability directly affects the power supply performance of the catenary and the safe operation of trains. Especially in the construction of existing high-speed railway lines, the quality of the excavation and support of the foundation pit directly impacts the safe operation and construction efficiency of the line. Therefore, the design and construction quality of the foundation pit support formwork are of paramount importance.

[0004] Currently, the foundation pit support for high-speed railway catenary support systems mostly uses traditional wooden formwork. Traditional wooden formwork support lacks sufficient strength to effectively resist soft soil layers and groundwater pressure. Dismantling is cumbersome and inconvenient, consuming significant time during maintenance windows, resulting in insufficient excavation time and difficulty in completing the foundation pit excavation within the stipulated time. Furthermore, wooden formwork support is ill-suited to complex geological conditions (such as water-filled pits and silt pits), resulting in poor support effectiveness and significant safety hazards. The low precision of wooden formwork support also leads to poor concrete forming quality (surface unevenness ≤10mm), and its complex installation and inconvenient operation negatively impact construction quality and efficiency.

[0005] To overcome the above drawbacks, steel formwork can be used for foundation pit support. This commonly used steel formwork is rectangular, and multiple pieces are assembled to form a rectangular cylindrical structure. The connections between the steel formwork pieces use a large number of bolts, thus requiring significant manpower and time for assembly and splicing, thereby reducing construction efficiency.

[0006] Patent CN115522567A discloses a single-sided formwork support device and method for a wall. This application employs an internally built-in inclined steel truss to fix and connect the steel mesh and the external wall casting formwork. The external side is supported by the external wall casting formwork, while the internal side utilizes the strength, stiffness, and stability of the retaining piles for support. The overall stability of the internally built-in inclined steel truss serves to tie the vertical steel reinforcement of the wall, increasing the wall's strength and stiffness, and improving its overall stability. However, because it connects the steel formwork with bolts, a large number of bolts are required to ensure the stiffness of the connected formwork, thus reducing the connection efficiency of the steel formwork. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a steel formwork for the support of the rigid crossbeam of the contact wire of existing high-speed railway lines, so as to solve the problem that it is time-consuming and laborious to use steel formwork to support the foundation pit of the high-speed railway contact wire support column.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] A steel formwork foundation pit support mold for the rigid crossbeam of the contact wire of an existing high-speed railway line includes two rectangular first connecting frames arranged symmetrically at the top and bottom, and a steel formwork assembly disposed between the two first connecting frames. Both first connecting frames are horizontally arranged. The steel formwork assembly includes a pair of first steel templates and a pair of second steel templates arranged opposite each other. Both the first and second steel templates are rectangular and vertically arranged. The first and second steel templates are alternately enclosed to form a rectangle. A clamping device is provided between the two first connecting frames to clamp the first and second steel templates vertically.

[0010] Furthermore, the cross-section of the first connecting frame is L-shaped. The inner edge of the first steel template and the inner edge of the second steel template correspond to the right angle of the first connecting frame. The first steel template and the second steel template are respectively sandwiched between the two first connecting frames. The bottom and top surfaces of the first connecting frame are provided with positioning holes, and pins are inserted into the positioning holes. The two first connecting frames are respectively fixedly connected to the corresponding pins.

[0011] Furthermore, horizontal connecting plates are fixedly connected to the inner sides of both first connecting frames, and the connecting plates on the two first connecting frames correspond to each other vertically. The clamping device includes a pull bar that runs vertically through the two connecting plates and a nut screwed onto the upper end of the pull bar. The lower end of the pull bar hangs under the lower connecting plate, and the nut is pressed against the upper connecting plate.

[0012] Furthermore, one side of the connecting plate is fixedly connected to the first connecting frame, and the connecting plate is provided with a notch communicating with the other side. The pull bar includes a rod and a head fixedly connected to the lower end of the rod. The head of the pull bar hangs below the lower connecting plate, the rod of the pull bar is located in the notch, and the nut is screwed onto the upper end of the rod of the pull bar. The size of the nut and the size of the head of the pull bar are both larger than the width of the notch.

[0013] Furthermore, both the upper connecting plate and the lower connecting plate have flanges at their edges to prevent the head of the lever or the nut from slipping off.

[0014] Furthermore, the steel formwork consists of at least two vertically arranged layers, with a second connecting frame sandwiched between adjacent layers. The cross-section of the second connecting frame is a horizontally placed T-shape. The second connecting frame is composed of a horizontal part and a vertical part fixedly disposed inside the horizontal part. The horizontal part is sandwiched between two first steel templates of two adjacent layers or between two second steel templates of two adjacent layers. The vertical part abuts against the inner side of the first or second steel template. Both the first and second steel templates are provided with positioning holes, and pins are inserted into the positioning holes. The pins are fixedly connected to the second connecting frame.

[0015] Furthermore, the length of the first steel template is greater than the length of the second steel template. The first steel template includes two right-angled trapezoidal half templates, with the inclined sides of the two half templates abutting each other. Both the upper and lower sides of the two half templates are provided with elongated positioning holes that are consistent with their length direction. Pins are inserted into the positioning holes, and the first connecting frame and the pins are fixedly connected.

[0016] The positive effects of this utility model are:

[0017] The system comprises a first steel template, a second steel template, a first connecting frame, and a second connecting frame. During assembly, these components are combined to form a rectangular cylinder. A clamping device then clamps the two first connecting frames, the two steel templates, and the second connecting frame. Since a large number of bolts are not required to connect the individual first and second steel templates, the assembly efficiency of the support formwork is improved, thereby accelerating construction progress and saving time and labor. The first and second connecting frames act as ring beams, and horizontal braces welded within them support the long sides of the first and second connecting frames, increasing the rigidity of the structure and making it more stable and less prone to deformation under external forces. Attached Figure Description

[0018] Figure 1 These are top views of embodiments 1 and 2;

[0019] Figure 2 These are side views of embodiments 1 and 2;

[0020] Figure 3 yes Figure 1 A cross-sectional view of the AA section;

[0021] Figure 4 This is a schematic diagram of the inner side of the first steel template in Examples 1 and 2;

[0022] Figure 5 yes Figure 1 A magnified view of a section of the central I area;

[0023] Figure 6 yes Figure 3 Enlarged view of a section in part II;

[0024] Figure 7 yes Figure 3 Enlarged view of a section of central III;

[0025] Figure 8 This is a side view of embodiment 3;

[0026] Figure 9 This is a schematic diagram of the inner side of the half-template in Example 3;

[0027] Figure 10 yes Figure 9 Top view;

[0028] In the picture:

[0029] 1. First connecting frame; 2. Connecting plate; 3. Horizontal brace; 4. First steel template; 5. Second connecting frame; 6. Second steel template; 7. Nut; 8. Tie bar; 9. Rib plate; 10. Flanged edge; 11. Notch; 12. Pin; 13. Positioning hole; 14. Reinforcing rib; 15. Half template. Detailed Implementation

[0030] Example 1

[0031] like Figure 1-7 As shown, a steel formwork foundation pit support mold for the rigid crossbeam of the contact wire of an existing high-speed railway line includes two rectangular first connecting frames 1 arranged symmetrically at opposite ends, and two steel formwork assemblies arranged vertically between the two connecting frames. A rectangular second connecting frame 5 is provided between the two steel formwork assemblies, and the second connecting frame 5 is horizontally arranged. Both first connecting frames 1 are horizontally arranged. Each steel formwork assembly includes a first steel template 4 and a second steel template 6 arranged opposite each other. Both the first steel template 4 and the second steel template 6 are rectangular and vertically arranged, and the first steel template 4 and the second steel template 6 enclose each other to form a rectangle. The two first connecting frames 1, the two steel formwork assemblies, and the second connecting frame 5 are connected sequentially to form a vertical rectangular cylindrical support mold.

[0032] A clamping device is provided between the two first connecting frames 1 to vertically clamp the two steel templates and the second connecting frame 5. The edges of the joint between the first steel template 4 and the second steel template 6 are both 45-degree bevels, so that the first steel template 4 and the second steel template 6 form a 90-degree angle after being spliced ​​together.

[0033] During assembly, this utility model first forms a steel module by enclosing a first connecting frame 1 with a first steel template 4 and a second steel template 6. Then, a second connecting frame 5 is placed on top. Next, a second steel module is formed by enclosing the second connecting frame 5 with the first steel template 4 and the second steel template 6. Then, another first connecting frame is placed on top, and the two first connecting frames 1, the two steel modules, and the second connecting frame 5 are clamped together by a clamping device.

[0034] Since it is not necessary to use a large number of bolts to connect the individual first steel templates 4 and second steel templates 6, the assembly efficiency of the support formwork can be improved, thereby speeding up the construction progress and saving time and effort.

[0035] Example 2

[0036] The difference between this embodiment and Embodiment 1 is that:

[0037] The cross-section of each of the first connecting frames 1 is L-shaped. The inner edges of the first steel template 4 and the second steel template 6 correspond to the right-angle portions of the first connecting frames 1, respectively. The first steel template 4 and the second steel template 6 are respectively sandwiched between the two first connecting frames 1. The inner edge of the top of the upper first steel template 4, the inner edge of the bottom of the lower second steel template 6, the inner edge of the top of the upper second steel template 6, and the inner edge of the bottom of the lower first steel template 4 respectively abut against the inner side of the right-angle portion of the corresponding first connecting frame 1, thereby positioning the first steel template 4 and the second steel template 6.

[0038] The cross-section of the second connecting frame 5 is a horizontal T-shape. The second connecting frame 5 consists of a horizontal part and a vertical part fixedly installed inside the horizontal part. The horizontal part is sandwiched between two first steel templates 4 of two adjacent steel template groups or between two second steel templates 6 of two adjacent steel template groups. The vertical part abuts against the inner side of the first steel template 4 or the inner side of the second steel template 6. The inner edge of the bottom of the upper first steel template 4, the inner edge of the top of the lower second steel template 6, the inner edge of the bottom of the upper second steel template 6, and the inner edge of the top of the lower first steel template 4 abut against the inner side of the right angle part of the corresponding second connecting frame 5, thereby positioning the first steel template 4 and the second steel template 6.

[0039] Positioning holes 13 are evenly distributed along the length direction on both the upper and lower surfaces of the first steel template 4 and the upper and lower surfaces of the second steel template 6. A pin 12 is inserted into each positioning hole 13. The second connecting frame 5 and the two first connecting frames 1 are respectively welded to the corresponding pin 12.

[0040] In actual manufacturing, the first connecting frame 1 can be made of angle steel and welded together, and the second connecting frame 5 can be made of T-shaped frame and welded together. Cross braces 3 are welded inside the first connecting frame 1 and the second connecting frame 5 to support the long sides of the first connecting frame 1 and the second connecting frame 5.

[0041] The first steel template 4, the second steel template 6, the first connecting frame 1, and the second connecting frame 5 are connected by pins 12 to prevent the first steel template 4 and the second steel template 6 from slipping. The first connecting frame 1 and the second connecting frame 5 act as ring beams, and the long sides of the first connecting frame 1 and the second connecting frame 5 are supported by cross braces 3, thereby increasing the rigidity of this utility model, making the structure more stable, and less prone to deformation under external forces.

[0042] The outer surfaces of the first steel template 4 and the second steel template 6 are located on the same plane as the outer surfaces of the corresponding first connecting frame 1 and the corresponding second connecting frame 5, respectively.

[0043] The dimensions of each first steel formwork 4 are: 2.2 meters long and 0.45 meters wide. The dimensions of each second steel formwork 6 are: 1 meter long and 0.45 meters wide. The structures of the first steel formwork 4 and the second steel formwork 6 are similar to those used in the existing construction industry, both constructed from welded steel plates with internally welded reinforcing ribs 14 in a grid pattern to increase strength. The final dimensions of the support formwork after assembly are: 2.2 meters long, 1 meter wide, and 0.9 meters high (the thickness of the first connecting frame 1 and the second connecting frame is negligible). The foundation pit dimensions for the high-speed railway contact network support pillars are consistent; therefore, the dimensions of the support formwork used are also the above dimensions. After the foundation pit is excavated on site, the formwork can be assembled in batches to further improve construction efficiency.

[0044] Rectangular connecting plates 2 are evenly distributed along the inner side of each of the two first connecting frames 1. The connecting plates 5 are welded to the corresponding first connecting frames 1. The connecting plates 2 on the two first connecting frames 1 are vertically aligned with each other, and the two vertically aligned connecting plates 2 form a connecting plate group. The number of clamping devices is the same as the number of connecting plate groups. Each clamping device includes a pull rod 8 that runs vertically through the two connecting plates 2 of each connecting plate group and a nut 7 screwed onto the upper end of the pull rod 8. The lower end of the pull rod 8 hangs under the lower connecting plate 2, and the nut 7 is pressed against the upper connecting plate 2.

[0045] One side of the connecting plate 2 is welded to the corresponding first connecting frame 1. The connecting plate 2 has a notch 11 communicating with its other side. The pull bar 8 includes a rod and a head fixedly connected to the lower end of the rod. The head of the pull bar 8 hangs below the lower connecting plate 2. The rod of the pull bar 8 is located inside the notch 11. The nut 7 is screwed onto the upper end of the rod of the pull bar 8. The nut 7 is a hexagonal nut, and the head of the pull bar 8 is cylindrical. The distance between the two opposite sides of the nut 7 and the diameter of the head of the pull bar 8 are both greater than the width of the notch 11, thereby preventing the head of the pull bar 8 and the nut 7 from passing through the notch 11 when tightening the nut 7.

[0046] Both the upper connecting plate 2 and the lower connecting plate 2 have flanges 10 at their edges to prevent the head of the tie rod 8 or the nut 7 from slipping off the connecting plate. A triangular reinforcing rib 9 is also welded between each connecting plate 2 and the corresponding first connecting frame 1 to improve the tensile strength of the connecting plate 8. The tie rod 8 can be installed through the notch 11 without passing through the connecting plate 2, making the installation of the tie rod 8 more convenient and faster, further improving construction progress and work efficiency.

[0047] Example 3

[0048] like Figure 8-10 The difference between this embodiment and Embodiment 2 is as follows:

[0049] The first steel template 4 includes two right-angled trapezoidal half templates 15, with the inclined sides of the two half templates 15 abutting each other. The positioning holes 13 are provided on the upper and lower sides of the two half templates 15 and are both elongated. The length of the positioning holes 13 is consistent with the length direction of the half templates 15.

[0050] During actual assembly, driven by the pull bar 8 and the nut 7, the first connecting frame 1 drives one half template 15 to move downward along the other half template 15. Under the action of the inclined surface on the half template 15, the half template 15 moves along its length direction and is pressed against the adjacent second steel template 6.

[0051] Because the first steel formwork 4 is too long, its manufacture and transportation are inconvenient. Dividing the first steel formwork 4 into two parts will facilitate its manufacture and transportation. In addition, since one side of each half formwork 15 is sloping, precise alignment is not required during installation, thus facilitating assembly.

[0052] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, with the aim of enabling those skilled in the art to understand the content of the present utility model and implement it accordingly. However, they are not limited to the present utility model, and the patent scope of the present utility model cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made to the spirit disclosed in the present utility model, without departing from the structure of the present utility model, such as local improvements within the system and modifications or transformations between subsystems, are still within the patent scope of the present utility model.

Claims

1. A steel formwork for the foundation pit support of the rigid crossbeam of the contact wire of an existing high-speed railway line, characterized in that, The system includes two rectangular first connecting frames (1) arranged symmetrically at the top and bottom, and a steel template set between the two first connecting frames (1). Both first connecting frames (1) are horizontally arranged. The steel template set includes a pair of first steel templates (4) and a pair of second steel templates (6) arranged opposite each other. Both the first steel templates (4) and the second steel templates (6) are rectangular and vertically arranged. The first steel templates (4) and the second steel templates (6) are alternately enclosed to form a rectangle. A clamping device is provided between the two first connecting frames (1) for clamping the first steel templates (4) and the second steel templates (6) vertically.

2. The steel formwork for the foundation pit support of the rigid crossbeam of the existing contact wire of a high-speed railway as described in claim 1, characterized in that, The cross-section of the first connecting frame (1) is L-shaped. The inner edge of the first steel template (4) and the inner edge of the second steel template (6) correspond to the right angle of the first connecting frame (1). The first steel template (4) and the second steel template (6) are respectively sandwiched between the two first connecting frames (1). The bottom and top surfaces of the first connecting frame (1) are provided with positioning holes (13). Pins (12) are inserted into the positioning holes (13). The two first connecting frames (1) are fixedly connected to the corresponding pins (12).

3. The steel formwork foundation pit support mold for the rigid crossbeam of the existing contact wire of a high-speed railway as described in claim 1, characterized in that, A horizontal connecting plate (2) is fixedly connected to the inner side of each of the two first connecting frames (1). The connecting plates (2) on the two first connecting frames (1) correspond to each other vertically. The clamping device includes a pull rod (8) that runs vertically through the two connecting plates (2) and a nut (7) screwed on the upper end of the pull rod (8). The lower end of the pull rod (8) hangs under the lower connecting plate (2), and the nut (7) is pressed against the upper connecting plate (2).

4. The steel formwork for the foundation pit support of the rigid crossbeam of the existing contact wire of a high-speed railway as described in claim 3, characterized in that, One side of the connecting plate (2) is fixedly connected to the first connecting frame (1). The connecting plate (2) is provided with a notch (11) communicating with the other side. The pull bar (8) includes a rod and a head fixedly connected to the lower end of the rod. The head of the pull bar (8) hangs below the lower connecting plate (2). The rod of the pull bar (8) is located in the notch (11). The nut (7) is screwed on the upper end of the rod of the pull bar (8). The size of the nut (7) and the size of the head of the pull bar (8) are both greater than the width of the notch (11).

5. The steel formwork foundation pit support mold for the rigid crossbeam of the existing contact wire of a high-speed railway as described in claim 4, characterized in that, Both the upper connecting plate (2) and the lower connecting plate (2) have flanges (10) at their edges to prevent the head of the lever (8) or the nut (7) from slipping off.

6. The steel formwork for the foundation pit support of the rigid crossbeam of the existing contact wire of a high-speed railway as described in claim 1, characterized in that, The steel formwork consists of at least two vertically arranged layers, with a second connecting frame (5) sandwiched between two adjacent layers. The cross-section of the second connecting frame (5) is a horizontally placed T-shape. The second connecting frame (5) consists of a horizontal part and a vertical part fixedly arranged inside the horizontal part. The horizontal part is sandwiched between two first steel templates (4) of two adjacent layers or between two second steel templates (6) of two adjacent layers. The vertical part abuts against the inner side of the first steel template (4) or the inner side of the second steel template (6). The first steel template (4) and the second steel template (6) are both provided with positioning holes (13). Pins (12) are inserted into the positioning holes (13), and the pins (12) are fixedly connected to the second connecting frame (5).

7. The steel formwork for the foundation pit support of the rigid crossbeam of the existing contact wire of a high-speed railway as described in claim 1, characterized in that, The length of the first steel template (4) is greater than the length of the second steel template (6). The first steel template (4) includes two right-angled trapezoidal half templates (15). The inclined sides of the two half templates (15) abut against each other. The upper and lower sides of the two half templates (15) are provided with long strip-shaped positioning holes (13) that are consistent with their length direction. A pin (12) is inserted into the positioning hole (13). The first connecting frame (1) and the pin (12) are fixedly connected.

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