A steel portal for launching a shield

Abstract

The utility model discloses a kind of portal steel boxes for shield launching belongs to tunnel construction equipment technical field, the portal steel box includes lower box and upper box;Upper and lower box are aligned by the splicing groove opened on side wall, then be locked fast by the connecting plate covered in outer side wall and the bolt passing among it, the side wall of lower box is fixed with buffer mechanism, the buffer mechanism includes supporting plate, assembly plate and trapezoidal plate fixed in supporting plate top, and buffer strip is arranged in the outer side of supporting plate, for filling the gap between adjacent steel box and providing support and buffering effect, the portal steel box further includes cover for plugging two ends and being provided with sealing ring and grouting hole, cover is fastened by first stud.The utility model solves the problem that existing portal steel box assembly is complex, efficiency is low, and the stability of integral structure after splicing is insufficient when bearing grouting expansion force, has the advantages of convenient and efficient assembly, stable and reliable structure, good sealing waterproof effect.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction equipment technology, and in particular to a portal steel box for shield tunneling initiation. Background Technology

[0002] Shield tunneling is an advanced technology in modern tunnel and underground engineering construction. Before the shield machine officially begins excavation, a sealed and robust temporary support structure, known as the tunnel portal, needs to be pre-constructed at the entrance of the starting shaft. This portal is typically composed of multiple large steel box structures spliced ​​together in a ring along the contour of the entrance, and a reliable waterproof and pressure-bearing barrier is formed by grouting into the steel boxes, creating the necessary conditions for the safe launch of the shield machine.

[0003] In current construction practices, these portal steel boxes are typically assembled on-site. Traditional assembly methods often rely on numerous bolt connections or on-site welding. This method is not only cumbersome and requires high alignment accuracy, but also involves a large amount of fastening or welding work within a limited working space, significantly extending the construction period and reducing overall construction efficiency.

[0004] More importantly, due to the complex on-site construction environment, the connections and gap treatment between the ring-shaped steel box structures assembled using traditional methods are often inadequate. When grouting is applied to reinforce the entire ring structure, the expansion force of the grout exerts enormous lateral pressure on the steel box structure. If the connections between the boxes are not tight enough or the support is insufficient, the entire structure is prone to deformation, misalignment, or even grout leakage, thereby affecting the overall stability and sealing and waterproofing effect of the tunnel portal, posing a safety hazard to the shield tunneling launch. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a portal steel box for shield tunneling, aiming to improve the problems of complex on-site assembly process, long time consumption, and the need to improve the overall structural stability after multiple steel boxes are spliced ​​into a ring in the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A portal steel box for shield tunneling launch includes: a lower box body and an upper box body assembled on the top of the lower box body, with splicing grooves for splicing and positioning correspondingly opened on the top side wall of the lower box body and the bottom side wall of the upper box body; as well as a connecting plate, a pin, a buffer mechanism, an L-shaped plate and a second stud. The connecting plate is vertically arranged and abuts against and is fixed to the outer side wall after the lower box and the upper box are spliced. The connecting plate has a strip hole, and both the lower box and the upper box have a combination hole that communicates with the strip hole. The pin is inserted into the strip hole and the combination hole in sequence. The buffer mechanism is fixedly connected to the right side of the lower housing. The buffer mechanism includes a support plate and a buffer strip fixed to the outside of the support plate.

[0007] Preferably, the outer end of the pin is integrally formed with a limiting disk, and the inner end is connected with a rotating rod for easy insertion and removal.

[0008] Preferably, the buffer mechanism further includes an assembly plate and two trapezoidal plates, the assembly plate and the two trapezoidal plates being fixed to the top of the support plate, and the assembly plate being clamped and fixed between the two trapezoidal plates.

[0009] Preferably, the side wall of the assembly plate is provided with a slot, and the trapezoidal plate is provided with a locking block that engages with the slot.

[0010] Preferably, the buffer strip is connected to a locking strip, and the assembly plate is provided with a slot for inserting the locking strip.

[0011] Preferably, the portal steel box for shield tunneling launch further includes a cover plate, which detachably closes the openings at both ends of the box structure formed by the lower box and the upper box.

[0012] Preferably, fixing blocks for abutting and supporting the cover plate are provided on the end walls of the lower box and the upper box.

[0013] Preferably, a sealing ring is fixed to the surface of the cover plate.

[0014] Preferably, the cover plate has grouting holes; it also includes a plurality of first studs, which pass through the cover plate and are threaded to the end walls of the lower housing and the upper housing.

[0015] This utility model has the following beneficial effects: 1. In this utility model, by setting up a splicing groove for the upper and lower boxes to cooperate, and using a connection structure for quick locking of the upper and lower boxes with connecting plates and pins, the problems of complex on-site assembly process of portal steel boxes, reliance on a large number of bolts for fastening or on-site welding, and low installation efficiency in the prior art are solved, and the beneficial effects of simplifying the installation steps, shortening the construction cycle and improving the assembly efficiency are achieved.

[0016] 2. In this utility model, by adding a specially designed buffer mechanism to the side wall of the lower box, the problems of difficulty in handling the gaps between the boxes after multiple steel boxes are spliced ​​into a ring, and the overall structure being prone to deformation and insufficient stability when subjected to grouting expansion force are solved. This achieves the beneficial effects of effectively filling gaps, buffering and resisting grouting expansion force, and significantly improving the stability and safety of the entire ring structure. Attached Figure Description

[0017] Figure 1This is a perspective view of a steel portal box for shield tunneling starting, as proposed in this utility model. Figure 2 This is a schematic diagram of the steel box mechanism for a tunnel portal steel box proposed in this utility model. Figure 3 This is a schematic diagram of the lower box of a steel box for tunnel portal initiation proposed in this utility model; Figure 4 This is a schematic diagram of the structure of an L-shaped plate for a tunnel portal steel box used for shield tunneling initiation, as proposed in this utility model. Figure 5 This is a schematic diagram of the buffer mechanism for a tunnel portal steel box proposed in this utility model. Figure 6 This is a schematic diagram of the trapezoidal plate of a tunnel portal steel box for shield tunneling starting, as proposed in this utility model. Figure 7 This is a schematic diagram of the structure of a pin for a tunnel portal steel box used for shield tunneling initiation, as proposed in this utility model.

[0018] Legend: 1. Steel box mechanism; 101. Lower box body; 102. Upper box body; 103. Splicing groove; 104. Combination hole; 105. Connecting plate; 106. Strip hole; 107. Pin; 108. Limiting plate; 2. Fixing block; 3. Rotating rod; 4. Cover plate; 5. Grouting hole; 6. First stud; 7. Sealing ring; 8. Buffer mechanism; 801. Buffer strip; 802. Clamping strip; 803. Support plate; 804. Clamping block; 805. Assembly plate; 806. Trapezoidal plate; 807. Slot; 808. Slot; 9. L-shaped plate; 10. Second stud. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Reference Figures 1-7This utility model provides an embodiment of a portal steel box for shield tunneling, comprising a lower box body 101 and an upper box body 102 assembled on top of the lower box body 101; the top sidewall of the lower box body 101 and the bottom sidewall of the upper box body 102 are respectively provided with splicing grooves 103 for splicing and positioning. During assembly, the upper box body 102 can be quickly aligned with the lower box body 101 through the splicing grooves 103 to form an integral box structure; in order to lock the two together, the portal steel box also includes a connecting plate 105 and a pin 107. The connecting plate 105 is vertically arranged and abuts against and is fixed to the outer sidewall of the lower box body 101 and the upper box body 102 after splicing. The connecting plate 105 is provided with a strip hole 106. Both the lower box body 101 and the upper box body 102 are provided with a combination hole 104 communicating with the strip hole 106. The pin 107 is sequentially inserted through the combination hole 104. The lower housing 101 and the upper housing 102 are quickly and securely connected together through the strip hole 106 and the combination hole 104. Specifically, the outer end of the pin 107 is integrally formed with a limiting plate 108, which is used to prevent the pin 107 from coming out of the combination hole 104 and the strip hole 106. The inner end of the pin 107 is connected with a rotating rod 3 for easy insertion and removal. In addition, on the outer wall of the lower housing 101 away from the upper housing 102, the cover plate 4 and the lower housing 101 are fixed by an L-shaped plate 9 and a second stud 10. The outer wall of the second stud 10 is fitted with an L-shaped plate 9. One side of the L-shaped plate 9 abuts against the lower housing 101, and the other side abuts against the outer wall of the cover plate 4. The second stud 10 passes through the L-shaped plate 9 to connect the cover plate 4 and the housing 101. The buffer mechanism 8 includes a support plate 803 and a buffer strip 801 fixed to the outside of the support plate 803. The buffer mechanism 8 also includes an assembly plate 805 and two trapezoidal plates 806. The assembly plate 805 and the two trapezoidal plates 806 are both fixed to the top of the support plate 803, and the assembly plate 805 is clamped and fixed between the two trapezoidal plates 806. To achieve reliable positioning between the assembly plate 805 and the trapezoidal plates 806, a slot 807 is provided on the side wall of the assembly plate 805, and a locking block 804 is provided on the trapezoidal plate 806 to engage with the slot 807. The engagement of the locking block 804 with the slot 807 ensures a stable positional relationship between the assembly plate 805 and the trapezoidal plates 806. The buffer strip 801 is connected via... The connecting strip 802 is connected to the assembly plate 805. The assembly plate 805 is provided with a corresponding slot 808 for the connecting strip 802 to be inserted. Through the insertion and engagement of the connecting strip 802 and the slot 808, the buffer strip 801 is fixed to one side of the assembly plate 805. In the assembled state, the buffer strip 801 of the buffer mechanism 8 on the steel box mechanism 1 is tightly abutted against the outer wall of the lower box 101 of the adjacent steel box mechanism 1. This structural fit ensures that the gap between the steel box mechanisms 1 is effectively filled and can provide buffer when the expansion force is generated by grouting, thereby improving the stability of the entire ring structure assembly. In order to achieve the sealing of the box structure and subsequent grouting reinforcement, the steel box of the tunnel also includes a cover plate 4. The cover plate 4 can be detachably closed to close the openings at both ends of the box structure formed by the lower box 101 and the upper box 102. In order to enhance the stability of the cover plate 4 installation, fixing blocks 2 are provided on the end walls of the lower box 101 and the upper box 102 for abutting and supporting the cover plate 4. To improve the sealing effect, a sealing ring 7 is fixed on the surface of one of the cover plates 4. For grouting, a grouting hole 5 is provided on the cover plate 4, and multiple first studs 6 are also included. The first studs 6 pass through the cover plate 4 and are threaded to the end walls of the lower box 101 and the upper box 102 to fasten the cover plate 4. To improve the ease of operation and reliability of the connection components, the outer end of the pin 107 is integrally formed with a limiting disk 108, and its inner end is connected with a rotating rod 3 for easy insertion and removal.

[0021] Working principle: When assembling a single portal steel box, the upper box 102 is first placed on top of the lower box 101, and the two are quickly and initially aligned by the splicing groove 103 on the side wall of the two. Then, the connecting plate 105 is attached to the outer side wall of the lower box 101 and the upper box 102 after splicing, so that the strip hole 106 on the connecting plate 105 is aligned with the combination hole 104 on the box. Then, the pin 107 is inserted into the strip hole 106 and the combination hole 104 by the auxiliary operation of the rotating rod 3, and the limiting plate 108 is used for limiting, thereby realizing the quick locking of the upper and lower boxes. This process simplifies the on-site installation steps and improves construction efficiency. When multiple assembled portal steel boxes are spliced ​​into a ring structure around the tunnel entrance, the lower box 101 and the cover plate 4 are pre-assembled together by L-shaped plate 9 and second stud 10. The external buffer strip 801 will tightly abut against the outer wall of the adjacent steel box mechanism 1, effectively filling the gap between the steel boxes, providing a closed boundary for subsequent grouting, and providing initial support and buffer for the entire ring structure. After the annular structure is assembled and positioned, the openings at both ends of the box structure are sealed with cover plates 4 and supported by fixing blocks 2. The cover plate 4 facing the opening enclosure structure forms a flexible seal through the sealing ring 7 on it. After the cover plate 4 is fastened with the first stud 6, grout is injected into the internal cavity of the steel box mechanism 1 through the grouting hole 5 on the cover plate 4. After the grout solidifies, the entire steel box mechanism 1 forms a dense whole, which greatly enhances its structural strength and enables it to effectively resist external water and soil pressure. At the same time, the expansion force generated by the grout during the grouting process is absorbed and buffered by the buffer mechanism 8, preventing the entire annular steel box structure from deforming or displacing due to excessive internal pressure, thus ensuring the overall stability and safety of the opening structure.

Claims

1. A portal steel box for shield tunneling launch, comprising: Steel box mechanism (1); The lower box (101) and the upper box (102) assembled on the top of the lower box (101) are provided with splicing grooves (103) for splicing and positioning on the top side wall of the lower box (101) and the bottom side wall of the upper box (102). The feature is that it further includes: a connecting plate (105) and a pin (107), wherein the connecting plate (105) is vertically arranged and abuts against and fixed to the outer side wall after the lower box (101) and the upper box (102) are spliced, the connecting plate (105) is provided with a strip hole (106), and both the lower box (101) and the upper box (102) are provided with a combination hole (104) communicating with the strip hole (106), and the pin (107) is sequentially inserted into the strip hole (106) and the combination hole (104); And a buffer mechanism (8), one side of which is fixedly connected to the right side of the lower housing (101), the buffer mechanism (8) includes a tray (803) and a buffer strip (801) fixed to the outside of the tray (803).

2. A portal steel box for shield tunneling launch according to claim 1, characterized in that: The outer end of the pin (107) is integrally formed with a limiting disk (108).

3. A portal steel box for shield tunneling launch according to claim 1, characterized in that: The buffer mechanism (8) further includes an assembly plate (805) and two trapezoidal plates (806), the assembly plate (805) and the two trapezoidal plates (806) are fixed to the top of the support plate (803), and the assembly plate (805) is clamped and fixed between the two trapezoidal plates (806).

4. A portal steel box for shield tunneling launch according to claim 3, characterized in that: The assembly plate (805) has a slot (807) on its side wall, and the trapezoidal plate (806) has a locking block (804) that engages with the slot (807).

5. A portal steel box for shield tunneling launch according to claim 3, characterized in that: The buffer strip (801) is connected to a locking strip (802), and the assembly plate (805) is provided with a slot (808) for inserting the locking strip (802).

6. A portal steel box for shield tunneling launch according to claim 1, characterized in that: It also includes a cover plate (4), which detachably closes the openings at both ends of the box structure formed by the lower box (101) and the upper box (102). A second stud (10) is fixedly connected to one side of the cover plate (4), and an L-shaped plate (9) is sleeved on the outer wall of the second stud (10). A fixing block (2) is fixedly connected to one side of the upper box (102), and a rotating rod (3) is rotatably connected inside the fixing block (2). The top of the cover plate (4) is rotatably connected to the outer wall of the rotating rod (3).

7. A portal steel box for shield tunneling launch according to claim 6, characterized in that: A sealing ring (7) is fixed on the surface of one of the cover plates (4).

8. A portal steel box for shield tunneling launch according to claim 6, characterized in that: At least one of the cover plates (4) is provided with a grouting hole (5); it also includes a plurality of first studs (6), which pass through the cover plate (4) and are threaded to the end walls of the lower box (101) and the upper box (102).

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