Combined end mold structure

Abstract

The utility model provides a combined type end mould structure, which belongs to the technical field of tunnel construction equipment and is characterized in that a plurality of rows of reinforcing steel bar units are arranged in a pouring cavity along the extending direction of a tunnel, the plurality of rows of reinforcing steel bar units extend from the pouring cavity and penetrate through end mould plugs, and each end mould plug comprises a telescopic mould plug plate arranged between two adjacent rows of reinforcing steel bar units. The telescopic mold plug plates can tightly abut against the multiple rows of steel bar units, and therefore the pouring cavity is sealed through the end mold plugs; the problems that in the prior art, steel bars are cut off during mold closing, or a rubber baffle with a framework is adopted, deformation is prone to occurring, machining is difficult and the like are solved, and the problem that in the prior art, large jacking force is needed during mold closing, and installation is inconvenient is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of tunnel construction equipment, specifically relating to a combined end formwork structure. Background Technology

[0002] During the secondary lining construction of tunnels, to ensure a tight bond between continuously poured concrete layers and prevent misalignment between the old and new concrete layers, which could affect the overall waterproofing performance of the tunnel, it is usually required to leave a section of reinforcing steel at the end of the previous concrete pour. This practice helps to enhance the bond between the old and new concrete layers and reduces the risk of tunnel leakage due to misalignment. However, the end formwork plugs used on site are mostly wooden or steel formwork. In the actual formwork closing operation, the reserved reinforcing steel can easily hinder the installation of such formwork, affecting the sealing and installation quality of the formwork. Therefore, during the formwork closing operation, construction workers often cut off the reserved reinforcing steel.

[0003] Currently, we have proposed some improvement measures to address the issue of construction workers cutting off reserved reinforcing bars. For example, patent application CN107060828B proposes a technical solution using multiple rubber baffles and setting waterstops and / or reinforcing bar layers between adjacent rubber baffles, which can ensure good formwork sealing without cutting off the reinforcing bar layer. However, this technology still has problems: 1. A skeleton needs to be set inside the rubber baffle; otherwise, the deformation during pouring may be too large, affecting the airtightness of the rubber baffle. The skeleton also complicates its production and processing. 2. The fourth rubber baffle is lifted by a lifting mechanism located below it, so that the fourth rubber baffle, inner ring reinforcing bar layer, third rubber baffle, waterstop, second rubber baffle, outer ring reinforcing bar layer, first rubber baffle, and back-adhesive waterstop fit tightly together and adhere to the tunnel roof. During the lifting process, the inner and outer ring reinforcing bar layers need to be lifted simultaneously, resulting in high lifting resistance.

[0004] Therefore, further improvements to existing technologies are needed. Summary of the Invention

[0005] The purpose of this invention is to provide a combined end mold structure, which aims to solve at least one of the above problems.

[0006] This utility model is achieved through the following technical solution:

[0007] A combined end-formation structure includes a trolley installed inside a tunnel, with a casting cavity formed between the top surface of the trolley and the surrounding rock of the tunnel. An end-formation plug is installed at at least one end face of the trolley, extending from the end face towards the surrounding rock of the tunnel and sealing the casting cavity. Multiple rows of reinforcing steel units are arranged inside the casting cavity along the tunnel extension direction, extending from the casting cavity through the end-formation plug. The end-formation plug includes at least one telescopic end-formation plate disposed between two adjacent rows of reinforcing steel units. When extended, the telescopic end-formation plate can press the multiple rows of reinforcing steel units together and achieve the sealing of the casting cavity by the end-formation plug.

[0008] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0009] This invention overcomes the problems of rebar cutting in existing technologies. Furthermore, since only some components of the end formwork plug, such as the first and second rebar protective layers, are flexible, no additional framework is needed while ensuring the rebar units can pass through. Moreover, because the telescopic formwork plug plate is positioned between two rows of rebar units, the lifting force is smaller compared to existing technologies, making construction operations more convenient. Attached Figure Description

[0010] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0011] Figure 1 This is a three-dimensional structural diagram of the combined end mold structure of this utility model in one direction;

[0012] Figure 2 This is a side view of the combined end mold structure of this utility model;

[0013] Figure 3 This is a three-dimensional structural diagram of the combined end mold structure of this utility model from another direction;

[0014] Figure 4 This is a schematic diagram of the main structure of the combined end mold structure of this utility model;

[0015] Figure 5 This is a three-dimensional structural diagram of the telescopic mold end plate used in this utility model;

[0016] Among them, 100-tunnel surrounding rock, 200-trolley, 300-pouring cavity, 400-end formwork plug, 500-reinforcement component, 600-reinforcing bar unit, 201-end face, 202-top face, 601-inner ring reinforcement, 602-outer ring reinforcement

[0017] 1-Support base, 2-Column clamping mechanism, 3-Column, 4-Rebar protective layer positioning module, 5-First rebar protective layer, 6-Padded block, 7-Embedded waterstop, 8-Expansion mold end plate, 9-Reinforcing grid, 10-Second rebar protective layer, 11-Backed waterstop. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0019] like Figures 1 to 5 As shown, this utility model provides a combined end-formation structure, which includes a trolley 200 disposed within a tunnel. A casting cavity 300 is formed between the top surface 202 of the trolley 200 and the surrounding rock 100 of the tunnel. An end-formation plug 400 is installed at at least one end face 201 of the trolley 200. The end-formation plug 400 extends from the end face 201 toward the surrounding rock 100 and closes the casting cavity 300. Multiple rows of reinforcing steel units 600 are arranged within the casting cavity 300 along the tunnel extension direction. These multiple rows of reinforcing steel units 600 extend from the casting cavity 300 and pass through the end-formation plug 400 (see [reference]). Figure 1 At least a portion of the multi-row steel reinforcement unit 600 is located on the side of the end mold plug 400 away from the pouring cavity 300. The end mold plug 400 includes at least a telescopic mold plug plate 8 disposed between two adjacent rows of steel reinforcement units 600. When the telescopic mold plug plate 8 is extended, it can press the multi-row steel reinforcement unit 600 tightly and realize the closure of the pouring cavity 300 by the end mold plug 400.

[0020] It should be noted that in existing technologies, when closing the formwork of the pouring cavity 300, the reinforcing bars usually need to be cut at the end formwork plug 400. This can easily lead to weak bonding between the old and new concrete layers and increase the risk of water and grout leakage in the tunnel later. Existing technologies also employ a method of passing the reinforcing bars through the end formwork plug 400, but this requires a frame to be installed within the rubber baffle, and the lifting mechanism is not located between adjacent rows of reinforcing bar units 600, resulting in high lifting resistance. This invention uses a telescopic formwork plug plate 8, which is positioned between adjacent rows of reinforcing bar units 600. When it extends, it can press against both rows of reinforcing bar units 600 at both ends, thereby sealing the pouring cavity 300. Compared to existing technologies, the lifting force during sealing is reduced, which is beneficial for construction operations.

[0021] In a further preferred embodiment, the end mold plug 400 further includes a steel reinforcement protective layer positioning module 4, a first steel reinforcement protective layer 5, a pad block 6, an embedded waterstop 7, a second steel reinforcement protective layer 10, and a backing waterstop 11, arranged sequentially from the end face 201 toward the tunnel surrounding rock 100. The steel reinforcement unit 600 passes through the end mold plug 400 from the first steel reinforcement protective layer 5 and the second steel reinforcement protective layer 10. The bottom of the steel reinforcement protective layer positioning module 4 is at least partially fixed at the end face 201. The backing waterstop 11 is attached to the inner wall of the tunnel. The telescopic mold plug plate 8 is disposed between the embedded waterstop 7 and the second steel reinforcement protective layer 10. With this arrangement, when the telescopic mold plug plate 8 extends, the first steel reinforcement protective layer 5 and the second steel reinforcement protective layer 10 are subjected to compressive force, thereby squeezing and sealing the corresponding steel reinforcement unit 600. In a preferred embodiment, both the first reinforcing bar protective layer 5 and the second reinforcing bar protective layer 10 are compressible reinforcing bar covering blocks, which can be compressed and deformed according to the shape of the reinforcing bar unit 600 to seal and cover it (preventing grout leakage during pouring). For example, both are polyurethane high-elasticity sealing blocks. More preferably, the polyurethane high-elasticity sealing blocks have perforations for the reinforcing bar unit 600 to pass through. With the above configuration, only some components of the end mold plug 400, such as the first reinforcing bar protective layer 5 and the second reinforcing bar protective layer 10, are flexible blocks, while the remaining components can still be rigid blocks. This ensures that the end mold plug 400 as a whole has sufficient strength and will not deform too much during pouring, thus affecting the airtightness. Since the reinforcing bar unit 600 passes through the perforations in the first reinforcing bar protective layer 5 and the second reinforcing bar protective layer 10, when compressed and deformed under pressure, the reinforcing bar can be firmly sealed and wrapped around the reinforcing bar unit 600, reducing grout leakage. In addition, the reinforcing bar unit 600 itself has a supporting function, and the first reinforcing bar protective layer 5 and the second reinforcing bar protective layer 10 do not need to be provided with additional skeleton structures. Preferably, the rebar protective layer positioning module 4 is a steel module.

[0022] Preferably, the multi-row steel bar unit 600 includes at least an inner ring steel bar 601 and an outer ring steel bar 602. Both the inner ring steel bar 601 and the outer ring steel bar 602 include multiple steel bars. The inner ring steel bar 601 passes through the end formwork plug 400 from the first steel bar protective layer 5, and the outer ring steel bar 602 passes through the end formwork plug 400 from the second steel bar protective layer 10 (see...). Figure 2 ).

[0023] To better achieve the purpose of this utility model, the combined end mold structure also includes a reinforcing component 500, which is located on the side of the end mold plug 400 away from the pouring cavity 300. The reinforcing component 500 is mainly provided to improve the pressure-bearing capacity of the end mold plug 400 during the pouring process and ensure construction safety.

[0024] Furthermore, the reinforcement component 500 includes a support base 1, a column clamping mechanism 2, and a column 3. The support base 1 is fixedly installed on the end face 201 of the trolley 200. The column 3 is disposed on the support base 1, and the column clamping mechanism 2 enables the column 3 to move toward the end mold plug 400, thereby pressing the column 3 against the end mold plug 400.

[0025] In a preferred embodiment, the support base 1 is located below the rebar protective layer positioning module 4, the column 3 extends to the tunnel surrounding rock 100, and a reinforcing grid 9 is also provided between the column 3 and the telescopic mold end plate 8. The reinforcing grid 9 is hollow to facilitate the telescopic mold end plate 8 to be telescopically extended by construction personnel.

[0026] Preferably, the support base 1 is provided with a plug hole for the column 3 to pass through, and the column clamping mechanism 2 is a threaded rod with a handle. The clamping and loosening of the column 3 can be achieved by turning the knob of the threaded rod.

[0027] In a preferred embodiment, the pad 6 is a rigid pad with a hollowed-out side facing away from the casting cavity 300. The purpose of this hollowing-out design is to reduce the weight of the pad 6 and facilitate installation.

[0028] It should also be noted that in this embodiment, the end mold plug 400 may sometimes not include the embedded waterstop 7 (its placement is determined according to actual construction needs). In this case, refer to... Figure 2 The expansion joint end plate 8 is provided with spacers 6 and a second reinforcing steel protective layer 10 at both ends; this method should also fall within the protection scope of this utility model. Furthermore, the spacers 6 serve two purposes: firstly, to support the embedded waterstop 7 and the expansion joint end plate 8; secondly, to cooperate with the expansion joint end plate 8 to achieve complete sealing of the pouring cavity 300. For example, if the expansion joint end plate 8 reaches its maximum lifting limit but still cannot completely seal the pouring cavity 300, the thickness or number of spacers 6 can be increased. Specifically, the spacers 6 can be a single piece or multiple pieces stacked on top of each other, and their number and thickness can be adjusted or selected according to the actual site conditions, for example, adjusted according to the spacing between the two layers of reinforcing steel units 600.

[0029] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A combined end form structure, comprising a trolley (200) arranged in a tunnel, a pouring cavity (300) being formed between a top surface (202) of the trolley (200) and the surrounding rock (100) of the tunnel, an end form plug (400) being mounted at at least one end surface (201) of the trolley (200), the end form plug (400) extending from the position of the end surface (201) towards the surrounding rock (100) of the tunnel and closing the pouring cavity (300), characterized in that, A plurality of rows of steel bar units (600) are arranged in the pouring cavity (300) along the tunnel extension direction, the plurality of rows of steel bar units (600) extend from the pouring cavity (300) through the end mold plug (400), the end mold plug (400) at least comprises a telescopic mold plug plate (8) arranged between two adjacent rows of steel bar units (600), the telescopic mold plug plate (8) can tightly press the plurality of rows of steel bar units (600) when stretched, thereby realizing the closing of the pouring cavity (300) by the end mold plug (400).

2. A modular end block structure as claimed in claim 1, wherein The end mold plug (400) further comprises a steel bar protection layer positioning module (4), a first steel bar protection layer (5), a cushion block (6), a second steel bar protection layer (10) and a back-sticking waterstop tape (11) arranged in sequence from the position of the end face (201) towards the tunnel surrounding rock (100), wherein the steel bar units (600) pass through the end mold plug (400) from the first steel bar protection layer (5) and the second steel bar protection layer (10), the bottom of the steel bar protection layer positioning module (4) is at least partially fixed at the position of the end face (201), the back-sticking waterstop tape (11) is attached to the inner wall of the tunnel, and the telescopic mold plug plate (8) is arranged between the cushion block (6) and the second steel bar protection layer (10).

3. A modular end block structure as claimed in claim 2, wherein The end mold plug (400) further comprises a middle-buried waterstop tape (7) arranged between the cushion block (6) and the telescopic mold plug plate (8).

4. A modular end block structure as claimed in claim 2 or 3, wherein, The first steel bar protection layer (5) and the second steel bar protection layer (10) are both compressible steel bar covering cushion blocks, which can be compressed and deformed according to the shape of the steel bar units (600) to seal and cover the steel bar units (600).

5. A combined end-die structure as claimed in claim 1 or 2 or 3, characterized in that The combined end mold structure further comprises a reinforcing assembly (500) located on the side of the end mold plug (400) away from the pouring cavity (300).

6. A modular end block structure as claimed in claim 5, wherein The reinforcing assembly (500) comprises a support seat (1), a column pressing mechanism (2) and a column (3), the support seat (1) is fixedly installed on the end face (201) of the trolley (200), the column (3) is arranged on the support seat (1) and can be moved towards the end mold plug (400) by operating the column pressing mechanism (2), and the column (3) is then tightly pressed against the end mold plug (400).

7. A modular end block structure as claimed in claim 6, wherein The support seat (1) is arranged below the steel bar protection layer positioning module (4), the column (3) extends to the tunnel surrounding rock (100), and a reinforcing grid (9) with hollow arrangement is further arranged between the column (3) and the telescopic mold plug plate (8).

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