Shield tunnel segment embedded channel mounting positioning jig

Abstract

In the field of shield tunnel construction technology, we provide a mounting and positioning jig for embedded channels in shield tunnel segments. [Solution] The system comprises a formwork plate 1, an embedded member 2, and a housing 3. A positioning mechanism 4 is integrated inside the housing, and a motor rotates a rotating shaft and gears, driving interlocking rods to move between symmetrically meshing racks 1 and 2. The connecting rods and sleeve rods 472 at the ends of the interlocking rods provide centering clamping for the embedded member. Mounting mechanisms 5 are provided on both sides of the housing, and the cooperation of a sliding column, ring, spring, and convex block enables quick-release locking with the formwork plate mounting groove. The sleeve rod and connecting rod have a separable connection structure with a gap fitting. Automated mechanical transmission solves the problem of inaccuracy in manual positioning, the sacrificial sleeve rod structure solves the problems of concrete damage during formwork removal and misalignment of the embedded member, and the quick-release mounting mechanism greatly improves on-site construction and mold rotation efficiency, effectively guaranteeing the quality of segment precasting.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnel construction, and particularly to a positioning fixture for installing a shield tunnel segment embedded channel.

Background Art

[0002] In modern urban subway and tunnel construction, the shield method is widely applied due to its safety and high efficiency. To meet the subsequent suspension installation needs of electrical and mechanical equipment, piping, and cables inside the tunnel, it is usually necessary to pre-embed a C-shaped alloy steel channel (i.e., an embedded channel) into the concrete segment during the precast process of shield tunnel segments. The installation accuracy of the embedded channel within the segment directly determines the flatness and reliability of subsequent piping connections. Therefore, high-precision positioning of the embedded channel during the segment precast and casting stage is extremely important.

[0003] Currently, in the precast production of shield tunnel segments, the arrangement of the embedded channel often relies on manual positioning depending on the experience of workers in many cases, or is supported by simple rigid tooling. There are obvious limitations in such conventional methods: on the one hand, it is difficult to guarantee the position consistency of the embedded members during mass production with manual operation, and inclination or deviation is likely to occur, resulting in poor positioning accuracy and affecting the high-precision connection of subsequent equipment; on the other hand, and more importantly, after the concrete is cast and reaches the initial hardening state, the tooling fixture used for fixing becomes difficult to remove due to its adhesion to the concrete.

[0004] Conventional rigid positioning jigs typically require significant external force to be applied during demolding to remove them from semi-solidified concrete. Since the concrete has not yet reached its final set strength at this stage, forceful removal of the jig can easily damage the concrete structure surrounding the embedded member, resulting in chipping or cracking of the segment surface. In severe cases, friction and oscillation during the removal process can cause minute displacement of the embedded member, destroying the original positioning accuracy and seriously impacting the segment's product quality and waterproofing performance. In light of this, we propose a shield tunnel segment embedded channel mounting positioning jig to solve the above problems. [Overview of the project] [Problems that the invention aims to solve]

[0005] In conventional technology, the positioning of the mounting positioning jig for embedded channels in shield tunnel segments relies mainly on human experience, making it difficult to unify the accuracy. Furthermore, it is difficult to remove the mounting jig after the initial hardening of the concrete, and forceful removal can easily damage the concrete structure around the embedded member, leading to misalignment of the embedded member. This invention aims to provide a mounting positioning jig for embedded channels in shield tunnel segments with an improved structure that can effectively solve the above problems. [Means for solving the problem]

[0006] This invention provides a mounting positioning jig for embedded channels in shield tunnel segments, the jig comprising a template, an embedded member disposed on the inner wall of the template, a housing attached to the side of the template, and a positioning mechanism provided in the housing and used as a positioning clamp for the embedded member.

[0007] Here, the positioning mechanism has a transmission structure that achieves synchronous centering clamping by power drive. The positioning mechanism includes a motor fixedly mounted inside the housing, a rotating shaft fixedly connected to the output terminal of the motor, a gear fixedly connected to the end of the rotating shaft, rack 1 and rack 2 meshing and connected to the outside of the gear, an interlocking rod fixedly connected to the tops of rack 1 and rack 2, and a clamp assembly fixedly connected to the end of the interlocking rod.

[0008] Furthermore, the housing and the positioning mechanism are combined in such a manner that the motor and the inner wall of the housing are fixedly connected. The clamp assembly includes a connecting rod fixed to the end of the interlocking rod, and a sleeve rod is fitted onto the outside of the connecting rod. The motor rotates the rotating shaft and the gear, slides the rack 1 and the rack 2, and further drives the interlocking rod and the sleeve rod fitted onto the connecting rod to achieve clamp positioning of the embedded member.

[0009] Preferably, mounting mechanisms for fixing the housing to the template are provided on both sides of the housing. The mounting mechanism comprises connecting plates fixed to both sides of the housing, with hollow columns fixed inside the connecting plates. The hollow columns are used to house and support internal components, ensuring the stability of the locking structure.

[0010] Preferably, a sliding column is inserted inside the hollow column, and the outer wall of the sliding column and the inner wall of the hollow column are connected so as to be slidable and rotatable. The sliding column is used to drive the locking and unlocking of the mounting mechanism, and a combined motion of axial movement and radial rotation enables quick hooking with the template.

[0011] Preferably, a ring is fixedly fitted to the outer wall of the sliding column located inside the hollow column, and the outer wall of the ring and the inner wall of the hollow column slide in close contact. The ring slides inside the hollow column when the sliding column is pressed and functions as a pressure-receiving end surface of a spring.

[0012] Preferably, a spring is fitted to the outside of the sliding column, and the spring is positioned between the ring and the inner bottom wall of the hollow column. The sliding of the ring presses the spring, generating an elastic force, which provides the elastic force for the return of the sliding column and ensures that the mounting mechanism has sustained tension when locked.

[0013] Preferably, two protruding blocks are fixed to the end of the sliding column, and the protruding blocks rotate in conjunction with the rotation of the sliding column. The protruding blocks are used to position and lock or release the housing, and in cooperation with the internal structure of the template, tool-free quick locking is achieved.

[0014] Preferably, a mounting groove is provided inside the mold plate, and the slide column and the convex block are inserted into the mounting groove. The convex block rotates within the mounting groove to engage and fix with the mold plate, and the axial movement of the convex block is restricted by a positioning cavity.

[0015] Preferably, the sleeve rod and the connecting rod are connected by a gap fitting, allowing for separation. The sleeve rod remains inside the concrete after concrete placement and initial hardening, and the connecting rod is pulled out when the housing is removed. This sacrificial demolding structure prevents concrete damage during formwork removal.

[0016] Preferably, a through-hole is provided in the side wall of the housing for the interlocking rod to pass through, and the outer wall of the interlocking rod and the inner wall of the through-hole are slidably connected. The through-hole is used to guide the movement of the interlocking rod and ensure the linearity of the clamping operation.

[0017] Preferably, a guide slide groove is provided on the inner wall of the housing, and sliders that cooperate with the guide slide groove are provided on the back surfaces of both rack 1 and rack 2. The sliders and the guide slide groove are slidably connected, thereby enhancing the stability of the reciprocating motion of the racks. [Effects of the Invention]

[0018] This invention has the following beneficial effects. 1. This invention provides a positioning mechanism that uses a motor to drive gears and slide racks on both sides synchronously. By utilizing the synchronous nature of the gear rack transmission, it achieves automatic centering clamping of embedded members using a clamp assembly. This solves the problems of variations in placement and poor positioning accuracy that arose in conventional technology, where the placement of embedded members depended on the experience of the worker. It achieves automated, high-precision positioning, ensures the positional stability of embedded members during the concrete pouring process, and improves the quality of segment products.

[0019] 2. This invention adopts a split design in which the connecting rod and sleeve rod cooperate in the clamp assembly, and by utilizing the sliding fitting relationship between the sleeve rod and the connecting rod, it solves the problems of the conventional technology in which it is difficult to remove the positioning workpiece after concrete hardening, and in which the concrete structure around the embedded member is damaged or the embedded member is misaligned due to forceful removal. The sleeve rod is left inside the segment as a sacrificial part, and the internal connecting rod is smoothly slid out without damage, achieving a simple demolding effect, and effectively guaranteeing the final installation accuracy of the embedded channel and the completeness of the surrounding concrete.

[0020] 3. The present invention provides an attachment mechanism in which a slide column, a spring, and a convex block cooperate, and by utilizing the principle of the energy storage of the spring and the rotational engagement positioning of the convex block, it solves the problem that the conventional positioning tooling is complicated and time-consuming in installation and removal by bolt fixation, realizes quick assembly and disassembly without tools, automatically pops out the housing by elastic force when unlocking, and achieves the technical effect of maintaining the fastened state by elastic force when locking, greatly improving the portability of the device and the mold rotation efficiency in on-site construction.

Brief Description of the Drawings

[0021] Hereinafter, the present invention will be described in more detail with reference to the drawings. [Figure 1] Three-dimensional schematic diagram of the shield tunnel segment embedding channel attachment positioning tool proposed by the present invention; [Figure 2] Structural schematic diagram of the linkage rod of the shield tunnel segment embedding channel attachment positioning tool proposed by the present invention; [Figure 3] Enlarged view of part A in FIG. 2; [Figure 4] Structural schematic diagram of the slide column of the shield tunnel segment embedding channel attachment positioning tool proposed by the present invention.

Explanation of Reference Numerals

[0022] 1, template; 2, embedding member; 3, housing; 4, positioning mechanism; 41, motor; 42, rotating shaft; 43, gear; 44, rack 1; 45, rack 2; 46, linkage rod; 47, clamp assembly; 471, connecting rod; 472, sleeve rod; 5, attachment mechanism; 51, connecting plate; 52, hollow column; 53, slide column; 54, ring; 55, spring; 56, convex block.

Embodiments for Carrying out the Invention

[0023] The following will combine with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor shall fall within the protection scope of the present invention.

[0024] Embodiment: Referring to FIGS. 1-4, the embodiment of the present invention provides a shield tunnel segment embedded channel installation positioning jig, which aims to solve the problems that the arrangement of the embedded member 2 in the prior art depends on artificial experience, resulting in poor positioning accuracy, and it is difficult to remove the positioning tooling after the concrete hardens, and the structure around the embedded member is easily damaged.

[0025] The shield tunnel segment embedded channel installation positioning jig comprises a template 1, an embedded member 2 arranged on the inner wall of the template 1, and a housing 3 attached to the side surface of the template 1. The template 1 serves as the basic forming mold for segment casting, and mounting positions for accommodating the embedded member 2 are opened on its inner wall. The embedded member 2 is arranged at the mounting positions and waits for casting and fixing. The housing 3 serves as the main support part of the positioning device and is detachably and fixedly connected to the side surface of the template 1 by a mounting mechanism 5. A receiving cavity is formed inside the housing 3, and a positioning mechanism 4 is provided in the receiving cavity. The execution end of the positioning mechanism 4 extends from the housing 3 and penetrates into the template 1 to be used for automatic high-precision clamping and positioning of the embedded member 2. The mounting mechanism 5 is symmetrically provided on the outer walls on both sides of the housing 3, and cooperates with mechanical engagement and elastic force reset to stably lock the housing 3 to the template 1 and achieve quick separation during removal. The housing 3, the positioning mechanism 4, and the mounting mechanism 5 jointly constitute a construction auxiliary device that integrates high-precision positioning and portable assembly and disassembly. Here, the positioning mechanism 4 realizes synchronous centering clamping of the embedded member 2 by electric drive, effectively avoiding errors caused by manual operation; the mounting mechanism 5 improves the efficiency of on-site construction with a boltless quick-release structure.

[0026] The positioning mechanism 4 mainly consists of a motor 41, a rotating shaft 42, a gear 43, a rack 1 (44), a rack 2 (45), an interlocking rod 46, and a clamp assembly 47. The motor 41 is fixedly connected to the inner wall of the housing 3 by bolts as a power source, the output shaft of the motor 41 is fixedly connected to one end of the rotating shaft 42 by a coupling, and the gear 43 is fixedly fitted to the other end of the rotating shaft 42. When the motor 41 is energized and started, the rotating shaft 42 and the gear 43 perform rotational motion.

[0027] Racks 1 (44) and 2 (45) are provided on both sides of gear 43, and racks 1 (44) and 2 (45) are distributed symmetrically with respect to the axis of gear 43, and the tooth surfaces of both racks 1 (44) and 2 (45) mesh with gear 43 and maintain a connected state. When gear 43 rotates clockwise or counterclockwise, the meshing transmission of gear 43 causes racks 1 (44) and 2 (45) to move linearly toward or apart from each other in the horizontal direction. An interlocking rod 46 is fixedly connected to the top of rack 1 (44), and similarly an interlocking rod 46 is fixedly connected to the top of rack 2 (45). These two interlocking rods 46 move synchronously with the corresponding racks and are used to transmit the linear motion of the racks to the end components.

[0028] One end of the interlocking rod 46, away from rack 1 (44) or rack 2 (45), extends from the housing 3 and is fixedly connected to a clamp assembly 47. A through hole is provided in the side wall of the housing 3 for the interlocking rod 46 to pass through, and the outer wall of the interlocking rod 46 and the inner wall of the through hole are slidably connected. The through hole provides guidance and support for the movement of the interlocking rod 46, preventing the interlocking rod 46 from bending or shifting when subjected to force.

[0029] The inner wall of housing 3 is further provided with guide slide grooves, and sliders that cooperate with these guide slide grooves are provided on the backs of rack 1 (44) and rack 2 (45), and these sliders are slidably fitted into the guide slide grooves. This cooperative structure of sliders and slide grooves restricts the vertical degrees of freedom of racks 1 (44) and rack 2 (45), ensuring that they slide stably only in the horizontal direction, thereby improving the accuracy of power transmission and the stability of clamping.

[0030] In a preferred embodiment, the clamp assembly 47 employs a unique split design. Referring to Figure 3, the clamp assembly 47 specifically comprises a connecting rod 471 fixedly connected to the end of the interlocking rod 46, and a sleeve rod 472 fitted onto the outer surface of the connecting rod 471. The inner diameter of the sleeve rod 472 is slightly larger than the outer diameter of the connecting rod 471, forming a sliding connection relationship between them through gap fitting. During positioning, the connecting rod 471 is inserted into the sleeve rod 472, and the thrust of the interlocking rod 46 moves the sleeve rod 472 to clamp the embedded member 2. After concrete placement is complete and initial hardening occurs, the sleeve rod 472 solidifies within the concrete and becomes difficult to move. At this time, when the housing 3 is pulled outward, the connecting rod 471 smoothly slides out from the sleeve rod 472, achieving damage-free demolding. The sleeve rod 472 remains permanently within the segment as a sacrificial part, effectively ensuring that the positional accuracy of the embedded member 2 is not affected by the formwork demolding operation.

[0031] In another preferred embodiment, the mounting mechanism 5 includes connecting plates 51 fixed to both outer walls of the housing 3, with a hollow column 52 fixedly connected inside the connecting plates 51. The hollow column 52 not only provides a connecting function but also functions as a guide and housing cavity for internal movable parts. A sliding column 53 is inserted inside the hollow column 52, and the outer wall of the sliding column 53 and the inner wall of the hollow column 52 are in a cooperative relationship that allows them to slide axially and rotate around an axis. One end of the sliding column 53 extends from the hollow column 52 and enters the inside of the template 1, while the other end serves as an operating end for pressing or rotating by a worker. A ring 54 is fixedly fitted to the outer wall of the sliding column 53 located inside the hollow column 52, the outer diameter of the ring 54 matches the inner diameter of the hollow column 52, and the outer wall of the ring 54 and the inner wall of the hollow column 52 slide tightly together. A spring 55 is fitted onto the outer surface of the slide column 53, between the ring 54 and the inner bottom wall of the hollow column 52. Both ends of the spring 55 abut against the side surface of the ring 54 and the inner bottom wall of the hollow column 52, respectively. The compression of the spring 55 by the ring 54 accumulates elastic force, which always tends to move the slide column 53 away from the mold plate 1. Two convex blocks 56 are fixedly connected to one end of the slide column 53 that extends into the mold plate 1, and these two convex blocks 56 extend symmetrically outward along the radial direction of the slide column 53. Correspondingly, mounting grooves for inserting the slide column 53 and the convex blocks 56 are provided on the side surface of the mold plate 1, and positioning cavities for the rotation and engagement of the convex blocks 56 are communicated within these mounting grooves. When it is necessary to fix the housing 3, the sliding column 53 is pressed to insert the convex block 56 into the mounting groove, and the sliding column 53 is immediately rotated to rotate the convex block 56 into the positioning cavity. At this time, the convex block 56 is blocked by the wall of the positioning cavity, making it difficult for it to exit in the axial direction, and as a result the housing 3 is tightly pulled to the mold plate 1 under the tensile force of the spring 55 in the reverse direction, achieving stable mounting. When removal is necessary, the sliding column 53 is rotated in the reverse direction to align the convex block 56 with the exit of the mounting groove, and the spring 55 releases its elastic force, causing the sliding column 53 to automatically pop out, achieving quick unlocking.

[0032] The implementation principle of the embodiment of this application is as follows: First, the embedded member 2 is placed in the planned mounting position on the inner wall of the formwork 1, and the motor 41 inside the housing 3 is started. The motor 41 rotates the rotating shaft 42 and the gear 43 at its end, and the rotation of the gear 43 causes the racks 1 (44) and 2 (45), which are meshed and connected to it, to slide synchronously in opposite directions inside the housing 3. The movement of racks 1 (44) and 2 (45) synchronously displaces the interlocking rods 46 connected to their tops, and the interlocking rods 46 move the clamp assemblies 47 at their ends toward the center. Specifically, the connecting rod 471 stably moves the externally fitted sleeve rod 472 toward the embedded member 2, and the two sleeve rods 472 move until they tightly clamp both sides of the embedded member 2, thereby achieving high-precision automatic positioning of the embedded member 2. After positioning is complete, concrete pouring work can be performed immediately.

[0033] After the concrete has been poured and reached its initial hardening stage, the sleeve rod 472 has already been cast into the concrete and set and fixed with the concrete, at which point the housing 3 needs to be removed. By moving the housing 3 outward, the worker smoothly slides the connecting rod 471, which is fixed to the end of the interlocking rod 46, out from inside the sleeve rod 472, thereby separating the positioning mechanism 4 and the embedded member 2. In this process, the sleeve rod 472 remains permanently in the segment concrete as a sacrificial part, effectively avoiding disturbance of the position of the embedded member 2 or damage to the surrounding concrete structure caused by the conventional rigid pull-out method.

[0034] During the installation and removal of the housing 3, the worker controls the process using the installation mechanism 5. During removal, the sliding column 53 is rotated, causing the two protruding blocks 56 at its end to rotate within the positioning cavity inside the mold plate 1. When the protruding blocks 56 rotate and align with the exit position of the installation groove, the axial positioning is released. At this time, the pre-compressed and stored spring 55 releases its elastic force, propelling the ring 54 and sliding column 53 away from the mold plate 1. The protruding blocks 56 automatically pop out of the installation groove, enabling quick unlocking and removal of the housing 3. During installation, the sliding column 53 is pressed to compress the spring 55 and rotated to engage the protruding blocks 56 within the positioning cavity. The sustained restorative elastic force of the spring 55 tightens and fixes the housing 3 to the side of the mold plate 1, significantly improving mold rotation efficiency during on-site construction.

[0035] Finally, it should be noted that the above description represents only preferred embodiments of the present invention and does not limit it. Although the present invention has been described in detail based on the embodiments described above, those skilled in the art can still modify the technical solutions described in each of the embodiments described above, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A shield tunnel segment embedded channel mounting positioning jig comprising a template (1), an embedded member (2) disposed on the inner wall of the template (1), and a housing (3) attached to the side of the template (1), The housing (3) is provided with a positioning mechanism (4) used as a positioning clamp for the embedded member (2), and mounting mechanisms (5) for fixing the housing (3) to the template (1) are provided on both sides of the housing (3), the positioning mechanism (4) comprises a motor (41) fixedly mounted inside the housing (3), a rotating shaft (42) is fixedly connected to the output end of the motor (41), a gear (43) is fixedly connected to the end of the rotating shaft (42), racks 1 (44) and 2 (45) are meshed and connected to the outside of the gear (43), an interlocking rod (46) is fixedly connected to the tops of racks 1 (44) and 2 (45), and a clamp assembly (47) is fixedly connected to the end of the interlocking rod (46). A shield tunnel segment embedded channel mounting positioning jig characterized by the above.

2. The mounting mechanism (5) includes connecting plates (51) fixed to both sides of the housing (3), with a hollow column (52) fixed inside the connecting plates (51), and the hollow column (52) is used to house and support internal components. A shield tunnel segment embedded channel mounting positioning jig according to claim 1, characterized in that

3. A sliding column (53) is inserted inside the hollow column (52), and the outer wall of the sliding column (53) and the inner wall of the hollow column (52) are slidably and rotatably connected, and the sliding column (53) is used to drive the locking and unlocking of the mounting mechanism (5). The shield tunnel segment embedded channel mounting positioning jig according to claim 2, characterized in that

4. A ring (54) is fixedly fitted to the outer wall of the sliding column (53) located inside the hollow column (52), and the outer wall of the ring (54) and the inner wall of the hollow column (52) slide in close contact with each other. The ring (54) is used to slide inside the hollow column (52) when the sliding column (53) is pressed. The shield tunnel segment embedded channel mounting positioning jig according to claim 3, characterized in that

5. A spring (55) is fitted to the outside of the slide column (53), and the spring (55) is located between the ring (54) and the inner wall of the hollow column (52). The sliding of the ring (54) presses against the spring (55), generating an elastic force, and the spring (55) provides the elastic force for the return of the slide column (53). The shield tunnel segment embedded channel mounting positioning jig according to claim 4, characterized in that

6. Two protruding blocks (56) are fixed to the end of the slide column (53), and the protruding blocks (56) rotate in conjunction with the rotation of the slide column (53) and are used to position, fix, or release the housing (3). The shield tunnel segment embedded channel mounting positioning jig according to claim 3, characterized in that

7. A mounting groove is provided inside the template plate (1), the slide column (53) and the protruding block (56) are inserted into the mounting groove, and the protruding block (56) rotates within the mounting groove to achieve engagement and fixation with the template plate (1). The shield tunnel segment embedded channel mounting positioning jig according to claim 6, characterized in that

8. The clamp assembly (47) includes a connecting rod (471) fixed to the end of the interlocking rod (46), with a sleeve rod (472) fitted to the outside of the connecting rod (471). The motor (41) rotates the rotating shaft (42) and the gear (43), sliding the rack 1 (44) and the rack 2 (45), and driving the sleeve rod (472) fitted to the interlocking rod (46) and the connecting rod (471) to achieve clamp positioning of the embedded member (2). The sleeve rod (472) and the connecting rod (471) are separated by a connecting structure, the sleeve rod (472) remains inside the concrete after concrete placement and initial hardening, and the connecting rod (471) is pulled out when the housing (3) is removed. A shield tunnel segment embedded channel mounting positioning jig according to claim 1, characterized in that

9. The rack 1 (44) and the rack 2 (45) are located on either side of the gear (43), and the rotation of the motor (41) causes the rack 1 (44) and the rack 2 (45) to move toward or toward each other. A shield tunnel segment embedded channel mounting positioning jig according to claim 1, characterized in that

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