Fastener device for demoulding anti-disturbance anti-leakage tunnel concrete duct piece pre-buried channel

Abstract

The utility model provides a fastener device for a demoulding anti-disturbance anti-leakage tunnel concrete duct piece pre-buried channel, the fastener device is composed of a plastic annular buckle and a double-layer cover plate, the cover plate is pressed on the upper surface of a metal channel, the plastic annular buckle passes through a through hole and is in buckle connection with a stainless steel bolt column, and the stainless steel bolt column is in buckle connection with the cover plate. The pulling-out force strength of separation of the plastic annular buckle and the stainless steel bolt column is 15-20 MPa; the plastic annular buckle is provided with a plurality of axial open grooves in the circumferential direction to form a multi-petal clamping hook. And a handle is arranged at the top of the double-layer cover plate. According to the utility model, the fastener device is connected with the stainless steel bolt column on the mold in a buckling manner, and the pulling-out force strength is controlled to be between 15MPa and 20MPa, so that the pulling-out force strength is lower than the compressive strength of demolding concrete; and the situation that in the demolding process, due to the fact that the binding force between the fastener device and the stainless steel bolt column is too large, the fastener device slightly displaces, and disturbance is caused to the tunnel concrete duct piece is avoided.

Description

Technical Field

[0001] The utility model relates to the manufacture of tunnel concrete segments, in particular to a fastener device for an embedded channel of a tunnel concrete segment with demoulding anti-disturbance and anti-leakage functions. Background Art

[0002] At present, the initial water leakage parts of tunnel concrete segments used in tunnel construction mostly occur at the fastening bolts of the embedded channels. Through the observation and visit of multiple under-construction tunnel lines and the technical research on tunnel concrete segment manufacturers, it is found that when the tunnel concrete segments are demoulded, the connection bolts between the embedded channels and the moulds are pulled off to achieve the demoulding purpose. After testing the anti-pulling strength of the bolts, when the set tensile rate is 5 mm / min, the anti-pulling strength is about 60 MPa; when the set tensile rate is 50 mm / min, the anti-pulling strength is about 106 MPa.

[0003] When the tunnel concrete segments are demoulded 7 hours after casting and steam curing, the measured compressive strength is only 20 MPa. This is likely to cause the displacement of the embedded channels in the concrete, disturbing the concrete during the hardening process and leaving a hidden danger of poor bonding between the embedded channels and the concrete. As a result, the anti-seepage ability of the tunnel concrete segments at the embedded channels is weak, and the current detection method for the anti-seepage ability of tunnel concrete segments cannot observe the anti-seepage hidden danger at the embedded channels. This leads to the situation that the anti-seepage performance of the segments passes the factory inspection, but water leaks from the embedded channels after they are installed in the tunnel.

[0004] Problems and deficiencies of the prior art:

[0005] The tensile failure strength of the existing plastic bolts does not match the demoulding strength of the segment concrete, resulting in the disturbance of the embedded channels in the tunnel concrete segments when the tunnel concrete segments are demoulded after steam curing, affecting the concrete strength at the disturbed parts, and causing gaps or poor bonding at the glued joints between the concrete binder and the embedded channels. As a result, water seeps into the segments through these gaps, causing water leakage problems in the tunnel. Content of the Utility Model

[0006] The utility model provides a fastener device for an embedded channel of a tunnel concrete segment with demoulding anti-disturbance and anti-leakage functions. When concrete is poured into the cavity of a tunnel concrete segment forming mould to form a tunnel concrete segment, a metal channel with a "T"-shaped opening cross-section is installed upside down at the bottom of the tunnel concrete segment forming mould. Through holes and anchor bolts for embedded connection with the tunnel concrete segment are arranged on the upper surface of the metal channel. A stainless steel bolt column is arranged at the bottom of the tunnel concrete segment forming mould at the position of the through holes.

[0007] The fastener device is a "dry"-shaped buckle composed of a plastic annular buckle and a double-layer cover plate located on the top of the plastic annular buckle. The double-layer cover plate is pressed against the upper surface of the metal channel. The plastic annular buckle passes through the through hole and is snap-connected to the stainless steel bolt column. The pull-off force strength between the plastic annular buckle and the stainless steel bolt column is 15 MPa to 20 MPa;

[0008] The diameter of the plastic annular buckle is smaller than the aperture of the through hole. The plastic annular buckle is provided with a plurality of axial opening grooves in the circumferential direction to form multi-lobe hooks. The bottom of the multi-lobe hooks is provided with an inverted triangular hook member for snap-connecting with the stainless steel bolt column;

[0009] The width of the lower cover plate of the double-layer cover plate is greater than the aperture of the through hole, and the width of the upper cover plate is smaller than that of the lower cover plate.

[0010] Furthermore, the fastener device is integrally formed.

[0011] Furthermore, the material of the plastic annular buckle is any one of PP, PE, PVC, and ABS.

[0012] Furthermore, the plastic annular buckle is provided with 2 to 6 inverted triangular hook members in the circumferential direction.

[0013] Through the design optimization of the fastener device, the utility model snap-connects the fastener device with the stainless steel bolt column on the mold, and controls the pull-off force strength between 15 MPa and 20 MPa, making it lower than the compressive strength of the concrete, preventing the excessive bonding force between the fastener device 100 and the stainless steel bolt column from disturbing the tunnel concrete segment during the demolding process, solving the problems of demolding disturbance and water leakage in the prior art, and improving the overall quality and service life of the tunnel concrete segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of a tunnel concrete segment with a metal channel;

[0016] Figure 2 It is a front view of the fastener device in an embodiment of the present utility model;

[0017] Figure 3 It is an assembly schematic diagram of the fastener device;

[0018] Figure 4 It is the completed installation diagram of the fastener device;

[0019] Figure 5 It is the schematic diagram of pouring concrete in the die cavity;

[0020] Figure 6 It is the partial sectional view of the tunnel concrete segment formed after demoulding. Specific implementation mode

[0021] In the following description, a large number of specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the present utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present utility model, some well-known technical features in the art are not described.

[0022] In order to thoroughly understand the present utility model, detailed steps and detailed structures will be presented in the following description to explain the technical solution of the present utility model. The preferred embodiments of the present utility model are described in detail as follows. However, in addition to these detailed descriptions, the present utility model can also have other implementation manners.

[0023] Refer to Figure 1-6 As shown, the present utility model provides a fastener device for an embedded channel of a demoulding anti-disturbance and anti-leakage tunnel concrete segment. Concrete is poured in the cavity 2 of the tunnel concrete segment forming die 1 to form a tunnel concrete segment 3. A metal channel 4 with a "T"-shaped opening cross-section is installed upside down at the bottom of the tunnel concrete segment forming die 1. Through holes 5 and anchor bolts (not shown in the figure) for embedded connection with the tunnel concrete segment 3 are provided on the upper surface of the metal channel 4. A stainless steel bolt column 6 is provided at the bottom of the tunnel concrete segment forming die 1 at the position of the through hole 5.

[0024] The fastener device 100 is a "dry"-shaped buckle composed of a plastic annular buckle 110 and a double-layer cover plate 120 located at the top of the plastic annular buckle 110. The double-layer cover plate 120 is pressed against the upper surface of the metal channel 4. The plastic annular buckle 110 passes through the through hole 5 and is buckled with the stainless steel bolt column 6. The pull-off force strength of the separation between the plastic annular buckle 110 and the stainless steel bolt column 6 is 15 MPa to 20 MPa, such as 15 MPa, 17 MPa or 20 MPa.

[0025] The diameter of the plastic annular buckle 110 is smaller than the aperture of the through-hole 5. The plastic annular buckle 110 is provided with a plurality of axial opening grooves 111 along the circumferential direction to form multi-lobe hooks 112. At the bottom of the multi-lobe hooks 112, there is an inverted triangular hook member 113 for snap connection with the stainless steel bolt column 6; the width of the lower cover plate 121 of the double-layer cover plate 120 is greater than the aperture of the through-hole 5, and the upper cover plate 122 serves as a handle and its width is smaller than that of the lower cover plate 121.

[0026] The plastic buckle and the stainless steel bolt column have an appropriate tolerance matching degree. During operation, workers can easily push the plastic buckle into the card slot of the stainless steel bolt column fixed on the mold, and the strength for it to pull out of the card slot (between 15 MPa and 20 MPa) is lower than the compressive strength of the demolded concrete, thereby achieving the adverse consequence that the plastic buckle does not cause disturbance to the tunnel concrete segment. Using the bayonet bolt can improve work efficiency. Workers' operation is simple, and they do not need to use tools such as wrenches. Manual insertion can lock the channel onto the metal channel 4, and it can effectively ensure that the metal channel 4 does not shift during the concrete pouring and vibration compaction process.

[0027] With the double-layer cover plate design, the upper cover plate 122 can serve as a handle for workers during operation, and the lower cover plate 121 is used to tightly press and seal the through-hole 5, and can also increase the cementation area of the plastic buckle in the concrete, thereby increasing the stress area of the plastic buckle in the concrete, and thus improving the stress state of the plastic buckle during demolding. Compared with the original plastic bolt, the improved plastic buckle reduces the adverse impact on the concrete disturbance when applying the same external force.

[0028] The plastic annular buckle 110 is integrally injection molded using any one of PP, PE, PVC, and ABS.

[0029] The plastic annular buckle 110 is provided with 2 - 6 inverted triangular hook members 113 in the circumferential direction, which can be specifically selected according to the actual situation, and it is also convenient for the fastener device 100 to be snap-connected with the stainless steel bolt column 6. It should be noted that at the bottom of the stainless steel bolt column 6, there is a wedge-shaped ring groove 61 for cooperating with the inverted triangular hook member 113 to achieve the snap connection between the two.

[0030] Figure 3-6 This is the flowchart for manufacturing the tunnel concrete segment 3 of the present invention. First, the fastener device 100 is buckled on the upper surface of the metal channel 4. The plastic annular buckle 110 of the fastener device 100 is snap-connected with the stainless steel bolt column 6. The double-layer cover plate 120 is tightly pressed on the upper surface of the metal channel 4 and seals the through-hole 5, as Figure 1-2 shown. Pour concrete into the cavity 2, as Figure 3 . Demold, so that the metal channel 4 is embedded in the tunnel concrete segment 3. The metal channel 4 is firmly connected to the tunnel concrete segment 3 through several embedded anchor bolts.

[0031] The technical advantages of this utility model are as follows:

[0032] 1. Anti-disturbance design: Through the combination of plastic annular buckles and stainless steel bolt columns, the pulling-off force strength is controlled between 15 MPa and 20 MPa, which is lower than the compressive strength of concrete, preventing excessive bonding force between the fastener device and the stainless steel bolt column during the demoulding process from disturbing the tunnel concrete segment.

[0033] 2. Anti-leakage performance: The improved plastic buckle design avoids poor bonding and gaps caused by demoulding disturbance, thereby enhancing the anti-leakage ability at the embedded channel and reducing the problem of water leakage.

[0034] 3. Simple operation: The design of the plastic annular buckle is convenient for manual operation. Tools such as wrenches are not required, and workers can easily push the plastic buckle into the card slot of the stainless steel bolt column, improving work efficiency.

[0035] 4. Material and structure optimization: The plastic annular buckle is injection-molded in one piece using materials such as PP, PE, PVC, and ABS to ensure its durability and reliability. The multi-petal hook structure and double-layer cover design increase the bonding area and stress area of the buckle in the concrete, improve the stress state, and reduce the disturbance to the concrete.

[0036] 5. Operation handle design: A handle is provided on the top of the cover, which is convenient for workers to use during installation and operation, increasing the convenience and safety of operation.

[0037] 6. Mold and channel fixation: Through reasonable tolerance matching and buckle design, it can effectively ensure that the channel will not shift on the mold surface during the concrete pouring and vibration compaction process, ensuring the accurate positioning and stability of the embedded channel.

[0038] The above describes the preferred embodiments of this utility model. It should be understood that this utility model is not limited to the above specific implementation manners. The equipment and structures not described in detail should be understood to be implemented in the ordinary manner in the art; any person skilled in the art can make many possible changes and modifications to the technical solution of this utility model using the methods and technical content disclosed above, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of this utility model. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model still fall within the scope of protection of the technical solution of this utility model.

Claims

1. A demoulding, disturbance-proof and leakage-resistant tunnel concrete segment pre-embedded channel fastener device, wherein concrete is poured into a mold cavity (2) of a tunnel concrete segment forming mold (1) to form a tunnel concrete segment (3), a metal channel (4) with a "T"-shaped opening cross-section is installed in an inverted manner at the bottom of the tunnel concrete segment forming mold (1), a through hole (5) and an anchor bolt for embedding and connecting with the tunnel concrete segment (3) are provided on the upper surface of the metal channel (4), and a stainless steel bolt column (6) is provided at the through hole (5) at the bottom of the tunnel concrete segment forming mold (1), characterized in that: The fastener device (100) is a "stem"-shaped buckle component composed of a plastic annular buckle (110) and a double-layer cover plate (120) located on the top of the plastic annular buckle (110), the double-layer cover plate (120) being pressed against the upper surface of the metal channel (4), the plastic annular buckle (110) passing through the through hole (5) and being buckled and connected with the stainless steel bolt column (6), and the pull-out strength of the plastic annular buckle (110) and the stainless steel bolt column (6) being separated is 15MPa to 20MPa; The diameter of the plastic annular buckle (110) is smaller than the aperture of the through hole (5); the plastic annular buckle (110) is provided with a plurality of axial opening grooves (111) along the circumferential direction to form a multi-petal hook (112); and an inverted triangular hook piece (113) for being snap-connected with the stainless steel bolt column (6) is provided at the bottom of the multi-petal hook (112); The width of the lower cover plate (121) of the double-layer cover plate (120) is greater than the aperture of the through hole (5), and the width of the upper cover plate (122) is smaller than the lower cover plate (121).

2. A fastener device for pre-embedded channel of a demoulding, anti-disturbance and anti-leakage tunnel concrete segment as claimed in claim 1, characterized in that: The fastener device (100) is integrally formed.

3. A fastener device for pre-embedded channel of concrete segment of tunnel with demoulding, anti-disturbance and anti-leakage as claimed in claim 2, characterized in that: The material of the plastic annular buckle (110) is any one of PP, PE, PVC and ABS.

4. A fastener device for pre-embedded channel of a demoulding, disturbance-proof and leakage-resistant tunnel concrete segment as claimed in claim 1, characterized in that: The plastic annular buckle (110) is provided with 2 to 6 inverted triangular hook pieces (113) in the circumferential direction.

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