Ditch cable trough formwork fixing device relying on pipe piece bolts

Abstract

The utility model belongs to the field of building construction, and particularly relates to a ditch cable trough template fixing device relying on a duct piece bolt, which comprises a cross beam and a carrying pole beam arranged on the cross beam in a sliding mode. The two ends of the cross beam are connected with circumferential bolts of the duct pieces; and the carrying pole beam is connected with a pressing beam of the ditch cable trough template. According to the device, on the premise that expansion bolts are forbidden to be arranged on the concrete duct piece in a driving mode, operability and convenience of reinforcement of the ditch cable trough formwork are fully considered, potential quality hazards are eliminated, applicability of the ditch cable trough formwork is enhanced, the quality requirement for protection of a finished concrete duct piece product is met, it is ensured that the duct piece is attractive in appearance, and the overall image of a tunnel is improved.

Description

Technical Field

[0001] This utility model belongs to the field of building construction, and specifically relates to a formwork fixing device for water trench cable trough relying on pipe segment bolts. Background Technology

[0002] Shield tunnels are constructed using a tunnel boring machine (TBM) that assembles and installs precast tunnel segments inside the tunnel to complete the tunnel construction. Shield tunnel segments are precast concrete segments used in shield tunnel construction and are an important component of shield tunneling projects. Shield tunnel segments are primarily made of reinforced concrete.

[0003] In shield tunnel construction, cable trenches are an indispensable ancillary project, and their appearance quality directly affects the overall image of the tunnel, thus requiring high construction standards. As an ancillary project, cable trenches are generally constructed as the final step in the tunnel construction process, starting in the later stages, resulting in significant time pressure. Therefore, the construction quality and efficiency of cable trenches are particularly important in the later stages of tunnel construction. During the construction of cable trenches, the formwork for the cable trenches (…) Figure 3 (As shown) It is generally composed of a fixed steel formwork, a pressure beam, and expansion bolts 6 anchored to the invert concrete 5 and the segment concrete. The fixed steel formwork includes a drainage ditch formwork 2, a cable trough formwork 3, and a side formwork 7; the pressure beam 8 is set above the fixed steel formwork.

[0004] However, installing expansion bolts 6 on reinforced concrete segments will cause certain damage to segments 1. During the installation of expansion bolts, damage to the concrete substrate will occur, including tensile failure of the concrete in a conical shape with the anchor bolt as the axis, shear failure of the concrete in a wedge shape with the anchor bolt as the axis, and splitting failure of the concrete along the reinforcing bars caused by the expansion force of the anchor bolt. These damages may not have a significant impact on the quality of the segments in the short term, but in the long term, cracks are very likely to develop around the anchor bolt holes, or even through cracks, which are extremely detrimental to the quality of the segments and may even cause serious quality accidents such as tunnel leakage.

[0005] Therefore, many cities across China, including Beijing, Shanghai, Guangzhou, and Shenzhen, have explicitly prohibited the installation of expansion bolts on reinforced concrete tunnel segments. In conclusion, given the prohibition on installing expansion bolts on reinforced concrete tunnel segments, resolving the reinforcement issue of steel formwork for cable trenches is an urgent and important task. Utility Model Content

[0006] The purpose of this utility model is to overcome the defects in the prior art and provide a water trench cable trough template fixing device that relies on pipe segment bolts.

[0007] To achieve the above objectives, this utility model adopts the following technical solution:

[0008] A trench cable trough template fixing device based on pipe segment bolts includes a crossbeam and a spreader beam slidably mounted on the crossbeam; both ends of the crossbeam are connected to the circumferential bolts of the pipe segment; the spreader beam is connected to the pressure beam of the trench cable trough template.

[0009] The two ends of the spreader beam are provided with bolt holes; a fixing bolt is provided in the bolt hole; and a washer is provided at the position where the fixing bolt contacts the pipe segment.

[0010] The two ends of the crossbeam are respectively connected to the circumferential bolts through two segment bolt hole lugs; the spreader beam and the pressure beam are connected by pin lugs.

[0011] The width of the crossbeam is greater than the circumference width of the segment. Preferably, at least one of the segment bolt hole lugs is slidably connected to the crossbeam to accommodate different segment circumference widths.

[0012] The water ditch cable trough template includes a template and a pressure beam set above the template; the template includes a water ditch template, a cable trough template, and side templates.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This utility model discloses a trench cable trough formwork fixing device relying on tunnel segment bolts. It eliminates the method of using expansion bolts to reinforce reinforced concrete tunnel segments in the prior art, and solves the problem of frequent drilling operations on concrete tunnel segments during the reinforcement process, which damages the quality of the tunnel segments. This fixing device relies on the circumferential bolts of the shield tunnel segments to provide leverage points, and then uses the combination of crossbeams and spreader beams to provide force transmission points for the pressure beams. The device is firmly locked by hand-tightening the fixing bolts, thus making the entire trench cable trough formwork reinforcement system complete and effective, avoiding drilling holes in the concrete tunnel segments, and ensuring the physical quality of the tunnel segments.

[0015] In summary, this device fully considers the operability and convenience of reinforcing the formwork of the drainage ditch and cable trough under the premise that expansion bolts are prohibited from being driven into the concrete segments. It eliminates potential quality hazards, enhances the applicability of the drainage ditch and cable trough formwork, meets the quality requirements for the protection of finished concrete segments, ensures the aesthetic appearance of the segments, and improves the overall image of the tunnel. Attached Figure Description

[0016] Figure 1 This is a side view of the template fixing device for the water ditch cable trench based on the segment bolts of this utility model.

[0017] Figure 2 This is a front view of the structural diagram of the trench cable trough template fixing device based on the segment bolts of this utility model;

[0018] Figure 3This is a schematic diagram of a cable trough template in the prior art. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0020] Figure 1 Figure 2 shows a fixing device for a cable trough template in a drainage ditch, which relies on the bolts of the pipe segment. It includes a crossbeam 12 and a spreader beam 10 slidably disposed on the crossbeam. The two ends of the crossbeam 10 are connected to the circumferential bolts 9 of the pipe segment. The spreader beam 10 is connected to the pressure beam 8 of the cable trough template in the drainage ditch.

[0021] The two ends of the spreader beam 10 are provided with bolt holes; a fixing bolt 11 is provided in the bolt hole; a washer is provided at the position where the fixing bolt contacts the pipe segment 1.

[0022] The crossbeam 12 is connected to the circumferential bolt 9 via the segment bolt hole lug 13; the spreader beam 10 and the pressure beam 8 are connected via the pin lug 14.

[0023] The width of the crossbeam 12 is greater than the circumference of the segment 1.

[0024] The water ditch cable trough template includes a template and a pressure beam 8 set above the template; the template includes a water ditch template 2, a cable trough template 3, and a side template 7.

[0025] This device relies on the circumferential bolts 9 of the tunnel segments to provide the stress points. The circumferential joints of the tunnel segments typically include 12, 16, or 19 high-strength circumferential bolts, with the circumferential bolts at the same points on adjacent segments approximately at the same height. The crossbeam 12 is effectively connected to the tunnel segment bolts via bolt hole lugs 13. One of the bolt hole lugs has left-right adjustment capability. The length of the crossbeam 12 is slightly greater than the width of the tunnel segment circumference. The spreader beam 10 can be adjusted left-right along the entire length of the crossbeam 12 to accommodate the uncertainty of the position of the pressure beam 8. Each end of the spreader beam 10 has a hand-tightening fixing bolt 11. A gasket is placed at the contact point between the fixing bolt and the tunnel segment. After the spreader beam 10 reaches the desired position, the hand-tightening fixing bolt 11 is tightened, placing the spreader beam 10 in a fully locked state. The spreader beam 10 and the pressure beam 8 are connected via pin lugs 14.

[0026] The design principle of this device mainly relies on the circumferential bolts 9 of the shield tunnel segment to provide the leverage point, and then the combination of the crossbeam 12 and the flat beam 10 provides the force transmission point for the trench formwork pressure beam 8. The device is firmly locked by hand-tightening the bolts 11, so that the reinforcement system of the entire water trench cable trench formwork is complete and effective, avoiding drilling holes in the concrete tunnel segment and ensuring the physical quality of the tunnel segment.

[0027] Operating procedure for this device: Loosen the segment bolts 9, insert the segment bolt hole ear plate 13, tighten the segment bolts 9 again, adjust the spreader beam 10 left and right to reach the designated position, tighten the hand-tightening bolt 11 to completely lock the spreader beam 10, install the trench template, cable trough template, side template, etc., insert the pin into the pin shaft ear plate 14 and tighten it. The template system reinforcement is completed, and the trench concrete is poured.

[0028] In summary, this device fully considers the operability and convenience of reinforcing the drainage ditch and cable trough formwork under the premise that expansion bolts are prohibited from being driven into concrete segments. It eliminates potential quality hazards, enhances the applicability of the drainage ditch and cable trough formwork, meets the quality requirements for the protection of finished concrete segments, ensures the aesthetic appearance of the segments, and improves the overall image of the tunnel.

[0029] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A trench cable trough formwork fixing device relying on a piece of bolt, characterized in that, It includes a crossbeam and a spreader beam slidably mounted on the crossbeam; both ends of the crossbeam are connected to the circumferential bolts of the pipe segment; the spreader beam is connected to the pressure beam of the water ditch cable trough template.

2. The trench cable trough template fixing device based on segment bolts according to claim 1, characterized in that, The two ends of the spreader beam are provided with bolt holes; a fixing bolt is provided in the bolt hole; and a washer is provided at the position where the fixing bolt contacts the pipe segment.

3. The ettried sheet bolted water channel cable trough formwork fixing device according to claim 1, characterized in that, The two ends of the crossbeam are respectively connected to the circumferential bolts through two segment bolt hole lugs; the spreader beam and the pressure beam are connected by pin lugs.

4. The ettried sheet bolted water channel cable trough formwork fixing device according to claim 1, characterized in that, The width of the crossbeam is greater than the circumference of the segment.

5. The ettried sheet bolted water channel cable trough formwork fixing device according to claim 1, characterized in that, The water ditch cable trough template includes a template and a pressure beam set above the template; the template includes a water ditch template, a cable trough template, and side templates.

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