A segment precast positioning component and a segment precast method

Abstract

This invention provides a pre-positioning component for tunnel segments and a method for prefabricating tunnel segments, relating to the field of tunnel segment prefabrication technology. Addressing the problem of deviations easily occurring in the embedded parts of the installation channel during tunnel segment prefabrication, this invention provides a positioning sleeve in conjunction with a positioning screw. The positioning sleeve is installed on a pre-set stepped hole in the tunnel segment mold and secured with a nut, improving the stability of the connection between the positioning sleeve and the mold, resisting impacts during prefabrication, and slowing down wear. The positioning screw connects to the embedded parts, ensuring the accuracy of the embedded parts' arrangement, thereby improving the precision of the installed channel.

Description

Technical Field

[0001] This invention relates to the field of precast tunnel segment technology, specifically to a precast tunnel segment positioning component and a precast tunnel segment method. Background Technology

[0002] At this stage, after the completion of the subway tunnel shield tunneling, equipment installation is required to meet design requirements. The equipment is connected to the tunnel segments using chemical or mechanical bolts, but the construction period is long, construction is inconvenient in the narrow tunnel space, and drilling is required to drill holes in the concrete structure, which can damage the tunnel segment structure and create potential risks that affect the strength of the tunnel segments.

[0003] Currently, channels are commonly used to create connection points for equipment installation. This reduces labor intensity and shortens the construction period. The channels are protected beforehand during segment construction, and equipment is installed through them after segment construction is complete. However, during segment fabrication, embedded parts for installing the channels need to be arranged and fixed to the segment mold. With use, wear easily occurs between the connectors between the embedded parts and the mold, and between the connectors and the positioning holes on the mold. During prefabrication, the concrete filling impacts the embedded parts, causing rapid wear at the positioning connection points between the embedded parts and the mold. This results in significant misalignment between the connectors and the positioning holes, leading to deviations in the embedded part's placement. After segment prefabrication, the channels and embedded parts no longer correspond. Even if the channels are installed, their position deviates from the intended location, rendering the channels unusable. Summary of the Invention

[0004] The purpose of this invention is to address the deficiencies of existing technologies by providing a pre-positioning component and a pre-fabrication method for tunnel segments. A positioning sleeve is used in conjunction with a positioning screw. The positioning sleeve is installed on a pre-set stepped hole in the tunnel segment mold and secured with a nut. This improves the stability of the connection between the positioning sleeve and the mold, resists impacts during prefabrication, and slows down wear. The positioning screw connects to embedded parts, ensuring the accuracy of the embedded parts' arrangement, thereby improving the precision of the installed channel.

[0005] The first objective of this invention is to provide a pre-positioning component for tunnel segments, which employs the following solution:

[0006] It includes a positioning sleeve and a positioning screw. The outer circumference of the positioning sleeve is stepped shaft-shaped to fit the stepped hole on the segment mold. The small diameter section of the positioning sleeve is fitted with a nut. One end of the positioning screw is interference-fitted with the inner hole of the large diameter section of the positioning sleeve, and the other end is connected to the embedded part.

[0007] Furthermore, the positioning sleeve includes a positioning section and a fastening section distributed along the axial direction. The positioning section is a large-diameter section and the fastening section is a small-diameter section. The outer diameter of the positioning section is larger than the outer diameter of the fastening section, and the outer circumferential surface of the fastening section is provided with threads.

[0008] Furthermore, the inner hole of the positioning sleeve is a through hole, which extends through the positioning sleeve axially.

[0009] Furthermore, the area where the positioning screw connects to the embedded part is a threaded section, and the area that mates with the inner hole of the positioning sleeve is a smooth section.

[0010] Furthermore, a limiting ring is provided between the threaded section of the positioning screw and the smooth rod, with one side of the limiting ring conforming to the end face of the positioning sleeve and the other side conforming to the end face of the embedded part.

[0011] Furthermore, one end of the positioning screw is provided with a screw groove to cooperate with a screwdriver head, and the screw groove extends axially along the positioning screw into the threaded section.

[0012] Furthermore, the positioning screw is available in various specifications. Different positioning screws have the same size at one end of the inner hole of the positioning sleeve, while different positioning screws have different sizes at one end of the embedded part.

[0013] Furthermore, the positioning screw, positioning sleeve, and nut are arranged coaxially, with the positioning screw extending into the forming cavity of the segment mold and the nut located outside the segment mold.

[0014] A second objective of this invention is to provide a method for prefabricating tunnel segments with pre-positioning components as described in the first objective, comprising:

[0015] Stepped holes are set on the segment mold corresponding to the location of the embedded parts, and positioning sleeves are installed in the stepped holes;

[0016] The positioning sleeve is fastened to the segment mold by a nut. One end of the positioning screw is interference-fitted with the positioning sleeve, and the other end is connected to the embedded part.

[0017] After the segment casting and curing are completed, the positioning sleeve will be removed along with the mold, while the positioning screw will remain on the embedded part;

[0018] Remove the positioning screw from the embedded part and install the channel onto the embedded part.

[0019] Furthermore, after the positioning sleeve becomes worn and unusable, remove the positioning sleeve from the stepped hole and replace it with a new positioning sleeve.

[0020] Compared with the prior art, the advantages and positive effects of this invention are:

[0021] (1) In view of the problem that the embedded parts of the current installation channel are prone to deviation during the segment prefabrication process, a positioning sleeve is set in conjunction with a positioning screw. The positioning sleeve is installed on the stepped hole of the segment mold and a nut is set for tightening, which improves the stability of the connection between the positioning sleeve and the mold, resists the impact during the prefabrication process, and slows down the wear rate. The positioning screw connects the embedded parts to ensure the layout accuracy of the embedded parts, thereby improving the accuracy of the installed channel.

[0022] (2) Using the positioning sleeve as a sacrificial structure, when the positioning screw wears out over a long period of time, the wear of the positioning sleeve replaces the direct damage to the segment mold. When the positioning accuracy of the positioning sleeve can no longer meet the requirements, the positioning sleeve is replaced to ensure the long-term use of the segment mold, reduce costs and improve the accuracy of the embedded parts layout.

[0023] (3) The positioning sleeve and one end of the positioning screw are interference fit, so that the connected embedded parts are in the positioning position, improving the stability and accuracy of the embedded parts arrangement. At the same time, the insertion fit direction is consistent with the demolding direction, and the positioning screw can be released from the positioning sleeve under the action of external force during demolding, improving demolding efficiency and reducing jamming.

[0024] (4) A screw groove is provided at the smooth end of the positioning screw. After demolding, the smooth end of the positioning screw is used as the operating end. The positioning screw is taken out from the threaded hole of the embedded part by using a screwdriver head in conjunction with the screw groove, which improves the operating efficiency and reduces the risk of the positioning screw breaking. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the pre-positioning component for the tunnel segment in Embodiments 1 and 2 of the present invention.

[0027] Figure 2 This is a schematic diagram of the positioning sleeve in Embodiments 1 and 2 of the present invention.

[0028] Among them, 1. segment mold, 2. positioning sleeve, 3. positioning screw, 4. embedded part, 5. nut, 6. inner hole, 7. fastening section, 8. positioning section. Detailed Implementation

[0029] Example 1

[0030] In a typical embodiment of the present invention, such as Figures 1-2 As shown, a pre-positioning component for tunnel segments is presented.

[0031] When manufacturing tunnel segments, it is necessary to pre-arrange the embedded parts 4 for installing the channel and fix them to the segment mold 1. During use, the embedded parts 4 are easily worn by the connection parts and positioning holes of the mold. The impact of filling concrete on the embedded parts 4 causes the connection position to wear quickly, resulting in large fit errors and layout deviations. After the tunnel segments are prefabricated, the channel and the embedded parts 4 cannot correspond. Even if the channel is installed, the positional deviation will prevent normal use.

[0032] Based on this, this embodiment provides a pre-positioning component for tunnel segments, using a positioning sleeve 2 as a sacrificial part, which is installed on the tunnel segment mold 1 for connection to the positioning screw 3. The positioning sleeve 2 can be stably connected to the tunnel segment mold 1, ensuring the positioning accuracy of the positioning screw 3 and the embedded part 4 connected to it. At the same time, the positioning sleeve 2 can replace the frequent contact wear of the positioning screw 3 with the tunnel segment mold 1. The positioning sleeve 2 is replaceable, thereby ensuring the service life of the tunnel segment mold 1.

[0033] The pre-positioning components for tunnel segments will now be described in detail with reference to the accompanying drawings.

[0034] See Figure 1 The pre-positioning components for the tunnel segment include a positioning sleeve 2 and a positioning screw 3. The positioning sleeve 2 can be installed on the tunnel segment mold 1 to form a plug-in structure for temporarily fixing the positioning screw 3. During use, the positioning screw 3 is installed on the positioning sleeve 2, and the embedded part 4 is installed on the positioning screw 3, thereby fixing the embedded part 4 according to the set position. When demolding after use, the positioning screw 3 is removed from the positioning sleeve 2. The positioning screw 3 is fixed on the tunnel segment along with the embedded part 4, and the positioning sleeve 2 is removed from the formed tunnel segment along with the mold, waiting for the next use.

[0035] Specifically, such as Figure 2 As shown, the outer circumference of the positioning sleeve 2 is stepped, with an inner hole 6 at its center. The inner hole 6 is a through hole that penetrates the positioning sleeve 2 axially. The outer ring of the positioning sleeve 2 can mate with the segment mold 1. The segment mold 1 has a stepped hole, the size of which matches the outer circumference of the positioning sleeve 2. After the positioning sleeve 2 is inserted into the stepped hole, the nut 5 is used to tighten the positioning sleeve 2, thus fixing the positioning sleeve 2 to the segment mold 1. Figure 1 As shown.

[0036] The positioning sleeve 2 includes a positioning section 8 and a fastening section 7 distributed along the axial direction. The positioning section 8 and the fastening section 7 are fitted with stepped holes from different positions to form at least two sections of shaft hole fit relationship. The positioning section 8 is a large diameter section and the fastening section 7 is a small diameter section. The outer diameter of the positioning section 8 is larger than the outer diameter of the fastening section 7. The positioning section 8 fits into the large diameter section of the stepped hole of the segment mold 1, and the fastening section 7 fits into the small diameter section of the stepped hole of the segment mold 1. The fastening section 7 extends beyond the segment mold 1 after passing through the stepped hole of the segment mold 1.

[0037] The outer circumferential surface of the fastening section 7 is provided with threads, which are distributed in the area where the fastening section 7 extends beyond the mold. The nut 5 is fitted at the thread position, that is, the small diameter section of the positioning sleeve 2 is fitted with the nut 5. By tightening the nut 5, the positioning sleeve 2 is pressed and fixed in the stepped hole.

[0038] During the prefabrication of tunnel segments, the positioning sleeve 2 is fixed to the segment mold 1 and held in that position. After the prefabrication of tunnel segments, if the positioning sleeve 2 is worn excessively, it will affect the arrangement accuracy of the positioning screw 3 and the embedded part 4. After loosening the nut 5, the positioning sleeve 2 is removed and replaced.

[0039] like Figure 1 As shown, one end of the positioning screw 3 is interference-fitted with the inner hole 6 of the large diameter section of the positioning sleeve 2, and the other end is connected to the embedded part 4; the end of the positioning screw 3 connected to the positioning sleeve 2 through the interference fit is a smooth rod, and the smooth rod is inserted into the inner hole 6 of the positioning sleeve 2. The area of ​​the positioning screw 3 that is connected to the embedded part 4 is a threaded section, and the threaded section is matched with the pre-set threaded hole on the embedded part 4.

[0040] It should be noted that if both ends of the positioning screw 3 are threaded, and the positioning sleeve 2 is connected by a threaded fit, axial movement for demolding is not possible. The nut 5 must be loosened and removed before the positioning sleeve 2 can be removed as well, which increases wear between the positioning sleeve 2 and the stepped hole of the segment mold 1. Unlike the scheme where both ends of the positioning screw 3 are threaded, in this embodiment, the positioning sleeve 2 and one end of the positioning screw 3 are interference-fitted, ensuring the connected embedded part 4 is in the positioning position. This improves the stability and accuracy of the embedded part 4's placement. Simultaneously, the insertion direction is consistent with the demolding direction, allowing the positioning screw to disengage from the positioning sleeve 2 under external force during demolding, improving demolding efficiency and reducing jamming.

[0041] A limiting ring is provided between the threaded section of the positioning screw 3 and the polished rod. One side of the limiting ring is attached to the end face of the positioning sleeve 2, and the other side is attached to the end face of the embedded part 4. The fitting length between the positioning sleeve 2 and the polished rod is limited, and the fitting length between the threaded section and the embedded part 4 is also limited.

[0042] like Figure 1 As shown, one end of the smooth rod of the positioning screw 3 is provided with a screw groove to cooperate with a screwdriver head. The screw groove extends axially along the positioning screw 3 into the threaded section. By providing a screw groove at the smooth rod end of the positioning screw 3, after demolding, the smooth rod end of the positioning screw 3 serves as the operating end. The positioning screw 3 is removed from the threaded hole of the embedded part 4 using a screwdriver head in cooperation with the screw groove, thereby improving operating efficiency and reducing the risk of the positioning screw 3 breaking.

[0043] Because there are various types of embedded parts 4 arranged in the tunnel segments, such as M12 and M16, if different types of embedded parts 4 need to be arranged in the tunnel segments, the tunnel segment mold 1 needs to be re-drilled, and it cannot be quickly switched or reused. In this embodiment, to address this problem, the positioning screws 3 are configured with various specifications. Different positioning screws 3 have the same size at one end of the inner hole 6 of the positioning sleeve 2, while different positioning screws 3 have different sizes at one end of the embedded part 4. Using the same positioning sleeve 2, different specifications of positioning screws 3 can be installed, making it easy to replace the positioning screws 3 and meeting the installation, positioning and replacement requirements of the embedded parts 4.

[0044] The positioning screw 3, positioning sleeve 2, and nut 5 are arranged coaxially. The positioning screw 3 extends into the forming cavity of the segment mold 1, and the nut 5 is located outside the segment mold 1. The positioning sleeve 2 can be made of wear-resistant material, and the positioning screw 3 can be made of hard resin material.

[0045] The positioning sleeve 2 is set up in conjunction with the positioning screw 3. The positioning sleeve 2 is installed on the stepped hole of the segment mold 1 and is fastened with a nut 5 to improve the stability of the connection between the positioning sleeve 2 and the mold, resist the impact during the prefabrication process, and slow down the wear rate. The positioning screw 3 is connected to the embedded part 4 to ensure the layout accuracy of the embedded part 4, thereby improving the accuracy of the installed channel.

[0046] Example 2

[0047] In another typical embodiment of the present invention, such as Figures 1-2 As shown, a method for prefabricating tunnel segments using pre-positioning components is presented.

[0048] The segment prefabrication method, utilizing the segment prefabrication positioning component as shown in Example 1, includes:

[0049] A stepped hole is provided on the segment mold 1 corresponding to the location of the embedded part 4, and the positioning sleeve 2 is installed in the stepped hole;

[0050] The positioning sleeve 2 is fastened to the segment mold 1 by the nut 5. One end of the positioning screw 3 is interference-fitted with the positioning sleeve 2, and the other end is connected to the embedded part 4.

[0051] After the segment casting and curing are completed, the positioning sleeve 2 is removed along with the mold, while the positioning screw 3 is left on the embedded part 4;

[0052] Remove the positioning screw 3 from the embedded part 4 and install the channel onto the embedded part 4.

[0053] In addition, after the positioning sleeve 2 is worn out and can no longer be used, the positioning sleeve 2 will be removed from the stepped hole and replaced with a new positioning sleeve 2.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pre-positioning component for tunnel segments, characterized in that, It includes a positioning sleeve and a positioning screw. The outer circumference of the positioning sleeve is stepped shaft-shaped to fit the stepped hole on the segment mold. The small diameter section of the positioning sleeve is fitted with a nut. One end of the positioning screw is interference-fitted with the inner hole of the large diameter section of the positioning sleeve, and the other end is connected to the embedded part. The insertion and fitting direction is consistent with the demolding direction. The positioning screw can be dislodged from the positioning sleeve under the action of external force during demolding. The positioning sleeve is a replaceable sacrificial part used to replace the frequent contact wear of the positioning screw of the segment mold.

2. The pre-positioning component for tunnel segments as described in claim 1, characterized in that, The positioning sleeve includes a positioning section and a fastening section distributed along the axial direction. The positioning section is a large-diameter section and the fastening section is a small-diameter section. The outer diameter of the positioning section is larger than the outer diameter of the fastening section, and the outer circumferential surface of the fastening section is threaded.

3. The pre-positioning component for tunnel segments as described in claim 2, characterized in that, The inner hole of the positioning sleeve is a through hole, which extends through the positioning sleeve axially.

4. The pre-positioning component for tunnel segments as described in claim 1, characterized in that, The area where the positioning screw connects to the embedded part is the threaded section, and the area where it mates with the inner hole of the positioning sleeve is the smooth section.

5. The pre-positioning component for tunnel segments as described in claim 4, characterized in that, A limiting ring is provided between the threaded section of the positioning screw and the smooth rod. One side of the limiting ring is attached to the end face of the positioning sleeve, and the other side is attached to the end face of the embedded part.

6. The pre-positioning component for tunnel segments as described in claim 5, characterized in that, The positioning screw has a screw groove at one end to fit a screwdriver bit, and the screw groove extends axially into the threaded section along the positioning screw.

7. The pre-positioning component for tunnel segments as described in claim 1, characterized in that, The positioning screw is available in various specifications. Different positioning screws have the same size at one end of the inner hole of the positioning sleeve, while different positioning screws have different sizes at one end of the embedded part.

8. The pre-positioning component for tunnel segments as described in claim 1, characterized in that, The positioning screw, positioning sleeve, and nut are arranged coaxially, with the positioning screw extending into the forming cavity of the segment mold and the nut located outside the segment mold.

9. A method for prefabricating tunnel segments using a pre-positioning component for tunnel segments as described in any one of claims 1-8, characterized in that, include: Stepped holes are set on the segment mold corresponding to the location of the embedded parts, and positioning sleeves are installed in the stepped holes; The positioning sleeve is fastened to the segment mold by a nut. One end of the positioning screw is interference-fitted with the positioning sleeve, and the other end is connected to the embedded part. After the segment casting and curing are completed, the positioning sleeve will be removed along with the mold, while the positioning screw will remain on the embedded part; Remove the positioning screw from the embedded part and install the channel onto the embedded part.

10. The segment prefabrication method according to claim 9, characterized in that, After the positioning sleeve is worn out and unusable, remove the positioning sleeve from the stepped hole and replace it with a new positioning sleeve.

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