A concrete segment grouting hole reservation pouring device

Abstract

The application discloses a concrete segment grouting hole reservation pouring device, which comprises a bottom die, an upper die matched with the bottom die, a prefabricated cavity of the segment formed by cooperation of the bottom die and the upper die, a grouting hole reservation mechanism arranged at the arc center of the bottom die, a preburied base fixed on the bottom die and a preburied pipe vertically extended into the segment, an interference fit between the bottom of the preburied pipe and the preburied base, vertical separation of the preburied base and the preburied pipe during demolding, a step arranged around the preburied base for limiting, a first annular ring arranged below the step, a second annular ring and a third annular ring arranged above the step, and the like. The concrete segment grouting hole reservation pouring device can improve the reusability of the reservation mechanism, the preburied base is stable and not easy to be damaged and deformed during demolding of the segment, the grouting hole reservation precision is ensured, and the device is suitable for popularization and use.

Description

Technical Field

[0001] This invention relates to the field of precast tunnel segment production technology, and in particular to a pre-casting device for grouting holes in concrete tunnel segments. Background Technology

[0002] In rail transit shield tunnel engineering, precast arc-shaped segments are the core components of tunnel lining. Multiple arc-shaped segments are assembled sequentially to form a circular tunnel support structure. To meet the requirements of synchronous grouting at the shield tail gap, secondary reinforcement grouting, and segment assembly, grouting holes need to be reserved on each segment body. These holes also serve as hoisting holes.

[0003] During the precast casting stage of the tunnel segments, the reserved grouting holes must be equipped with corresponding base components. Currently, the industry generally uses rubber bases. The production process is as follows: first, the rubber base is fixedly installed at the corresponding positioning position of the tunnel segment steel mold, and then the grouting pipe is screwed and locked onto the rubber base; after the concrete is poured and steam-cured, the finished tunnel segment is lifted out of the mold and demolded. The grouting pipe will be pulled upward along with the tunnel segment and forcibly separated from the rubber base. This will cause the original rubber threaded base to be forcibly pulled and peeled off by the grouting pipe when the pipe segment is demolded, which is very likely to cause permanent deformation such as tearing of the rubber thread and cracking of the base, and can only be used once; while the mold needs to be replaced with a new base every time it is used, resulting in a large amount of material consumption.

[0004] In addition, traditional grouting pipes need to be manually screwed to the pre-embedded base one by one, which is time-consuming and labor-intensive during mass production.

[0005] Therefore, there is an urgent need for a grouting hole pre-casting device that can improve the utilization rate of the pre-embedded base, reduce the cost of production materials, and be compatible with existing segment prefabrication production lines. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned problems by providing a concrete segment grouting hole pre-casting device that can improve the reusability of the pre-casting mechanism, ensure the stability of the pre-embedded base during segment demolding, prevent damage and deformation, and guarantee the pre-casting accuracy of the grouting hole.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: a pre-casting device for grouting holes in concrete pipe segments, comprising a bottom mold and an upper mold adapted to the bottom mold, wherein the bottom mold and the upper mold cooperate to form a precast cavity for the pipe segment, and a grouting hole pre-casting mechanism is provided at the arc-shaped center of the bottom mold, wherein the pre-casting mechanism includes a pre-embedded base fixed on the bottom mold and a pre-embedded pipe extending vertically into the pipe segment, wherein the bottom of the pre-embedded pipe is interference-fitted with the pre-embedded base, and the pre-embedded base and the pre-embedded pipe are vertically separated during demolding.

[0008] Preferably, the embedded base is a cylindrical structure made of nylon, and the embedded base is provided with a step for limiting the position around it. A first annular ring is provided below the step, and a second annular ring and a third annular ring are provided above the step; wherein the outer diameter of the first annular ring is larger than the outer diameter of the second annular ring and the third annular ring.

[0009] Preferably, a screw rod extends through the center of the pre-embedded base, and the screw rod extends out of the bottom of the pre-embedded base and is detachably connected to the bottom mold.

[0010] Preferably, the pre-embedded pipe includes an upper sealing pipe and a lower threaded pipe, the sealing pipe and the threaded pipe are integrally formed, a stepped cover is provided below the threaded pipe, and the inner top wall of the stepped cover is provided with annular anti-reverse teeth.

[0011] Preferably, a plurality of fins are arranged in an array around the threaded tube, and the fins are arranged along the length direction of the threaded tube.

[0012] Preferably, the pre-embedded pipe covers the pre-embedded base, and the overall length of the pre-embedded pipe is less than the thickness of the pipe segment.

[0013] Preferably, the bottom mold has an opening facing downwards and is fixed to the base by multiple columns.

[0014] Preferably, the surface of the upper mold is provided with a pouring hole and an overflow hole that communicate with the precast cavity.

[0015] This invention discloses a pre-casting device for grouting holes in concrete segments, comprising a bottom mold and an upper mold adapted to the bottom mold. The bottom mold and the upper mold cooperate to form a prefabrication cavity for the segment. A grouting hole pre-casting mechanism is provided at the arc-shaped center of the bottom mold. The pre-casting mechanism includes a pre-embedded base fixed on the bottom mold and a pre-embedded pipe extending vertically into the segment. The bottom of the pre-embedded pipe is interference-fitted with the pre-embedded base. During demolding, the pre-embedded base and the pre-embedded pipe separate vertically. A step for limiting the position is provided around the pre-embedded base. A first annular ring is provided below the step, and a second annular ring and a third annular ring are provided above the step. Compared with the prior art, this pre-casting device for grouting holes in concrete segments has the beneficial effects of improving the reusability of the pre-casting mechanism, ensuring the stability of the pre-embedded base during segment demolding, preventing damage and deformation, and guaranteeing the accuracy of the grouting hole pre-casting. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a pre-casting device for grouting holes in concrete segments according to the present invention.

[0017] Figure 2 This is a schematic diagram of the base structure in a pre-casting device for grouting holes in concrete segments according to the present invention. Figure 1 .

[0018] Figure 3This is a schematic diagram of the base structure in a pre-casting device for grouting holes in concrete segments according to the present invention. Figure 2 .

[0019] Figure 4 This is a schematic diagram of the embedded base in a pre-casting device for pre-reserved grouting holes of concrete segments according to the present invention. Figure 1 .

[0020] Figure 5 This is a schematic diagram of the embedded base in a pre-casting device for pre-reserved grouting holes of concrete segments according to the present invention. Figure 2 .

[0021] Figure 6 This is a schematic diagram of the embedded pipe in a pre-casting device for grouting holes of concrete segments according to the present invention. Figure 1 .

[0022] Figure 7 This is a schematic diagram of the embedded pipe in a pre-casting device for grouting holes of concrete segments according to the present invention. Figure 2 .

[0023] Figure 8 This is a schematic diagram of the structure of the sealing plug and the pre-embedded pipe in this invention.

[0024] Figure 9 This is a schematic diagram of the structure of the tube segment in this invention. Figure 1 .

[0025] Figure 10 This is a schematic diagram of the structure of the tube segment in this invention. Figure 2 .

[0026] In the diagram: 1. Base; 2. Column; 3. Bottom mold; 31. Precast cavity; 4. Upper mold; 41. Pouring hole; 42. Overflow hole; 5. Reserved mechanism; 51. Embedded base; 511. Step; 512. Bolt; 513. First annular ring; 514. Second annular ring; 515. Third annular ring; 52. Embedded pipe; 521. Sealing pipe; 522. Threaded pipe; 523. Step cover; 524. Fin plate; 525. Anti-reverse locking tooth; 53. Sealing plug; 6. Segment; 7. Blind hole; 8. Grouting hole. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the invention in a schematic manner, and therefore only show the components relevant to the invention.

[0028] Please refer to Figure 1-3A pre-casting device for grouting holes of concrete pipe segments includes a bottom mold 3 and an upper mold 4 adapted to the bottom mold 3. The bottom mold 3 is set with its opening facing downward and is fixed to the base 1 by multiple columns 2. The bottom mold 3 and the upper mold 4 cooperate to form a precast cavity 31 of the pipe segment 6. The surface of the upper mold 4 is provided with a casting hole 41 and an overflow hole 42 communicating with the precast cavity 31 for casting concrete and venting air in the cavity to ensure the forming quality of the precast pipe segment 6. Simultaneously, the overflow of concrete can be observed at the overflow hole 42 to determine whether the concrete has filled the entire precast cavity 31, avoiding defects such as voids or material shortages inside the segment 6, and ensuring that the structural strength of the formed segment meets the design requirements. When a continuous and uniform concrete slurry steadily overflows from the overflow hole 42, the pouring can be stopped without the need for additional detection devices to determine the pouring status, simplifying the precasting process and improving production efficiency.

[0029] The pre-embedded pipe 52 completely encloses the pre-embedded base 51, and the overall length of the pre-embedded pipe 52 is less than the thickness of the pipe segment 6, ensuring that the top of the pre-embedded pipe 52 does not exceed the surface of the pipe segment 6 after molding, and at the same time forming a complete top-sealed blind hole 7; during the hoisting and transportation process, a hoisting head can be installed in the blind hole 7 to meet the hoisting and transportation requirements of the prefabricated pipe segment 6. When the pipe segment 6 is assembled and grouting is required, the top of the blind hole 7 can be directly chiseled to form a connected grouting hole 8, without the need for additional drilling operations, which greatly reduces the difficulty of subsequent grouting construction, while ensuring the accuracy of the position of the grouting hole 8.

[0030] like Figure 9 As shown, when the segment 6 is separated from the bottom mold 3 and the upper mold 4, it forms an arc-shaped precast concrete structure. At this time, the embedded pipe 52 remains inside the segment 6. Since the height of the embedded pipe 52 is less than the thickness of the segment, the embedded pipe 52 is completely embedded inside the segment 6 and forms a blind hole 7. At this time, the blind hole 7 can be connected to the external hoisting head to realize the hoisting of the segment. like Figure 10 As shown, when the segment 6 is installed and grout needs to be poured into the outer arc surface (between the segment and the tunnel), the blind hole 7 is chiseled through manually and with tools to form a connected grouting hole 8. At this time, the external grout can be directly injected into the hole to meet the grouting requirements.

[0031] In other words, when grouting is not required, the outer contour of the blind hole segment is solid concrete, which has properties such as impermeability and compressive strength, and improves the overall stress; whether grouting is required depends on the on-site construction conditions.

[0032] Please refer to Figure 4-5In this embodiment, a grouting hole pre-reservation mechanism 5 is provided at the arc-shaped center of the bottom mold 3. The pre-reservation mechanism 5 includes a pre-embedded base 51 fixed on the bottom mold 3 and a pre-embedded pipe 52 extending vertically into the pipe segment 6. The pre-embedded base 51 is made of hard plastic or nylon and has a cylindrical structure. A screw 512 passes through its axis. The screw 512 extends out of the bottom of the pre-embedded base 51 and is detachably connected to the bottom mold 3 to realize the fixed installation of the pre-embedded base 51 on the bottom mold 3. A step 511 for limiting is provided around the pre-embedded base 51. A first annular ring 513 is provided below the step 511, and a second annular ring 514 and a third annular ring 515 are provided above the step 511. The first annular ring 513, the second annular ring 514 and the third annular ring 515 are designed to achieve an interference fit with the embedded pipe 52, further reducing the fit gap, improving the sealing stability of the embedded base 51 after installation, and preventing concrete slurry from seeping into the connection gap during the pouring process; and the embedded base 51 made of plastic or nylon is not easily damaged or deformed during demolding, and has a high reuse rate.

[0033] In this embodiment, all three annular rings are silicone rings, hydrogenated nitrile rubber rings, or rubber sealing rings. All three have good elasticity and sealing performance, and can fill the gap between the embedded base and the embedded pipe under external pressure, further blocking the path of concrete grout to seep into the connection, preventing the embedded pipe from being jammed after the grout solidifies, and ensuring that the demolding operation can be completed smoothly. At the same time, silicone, hydrogenated nitrile rubber, and ordinary rubber materials all have excellent anti-aging properties, and can maintain stable elasticity and sealing performance even under repeated use and multiple high-temperature steam curing conditions, with long service life and low replacement and maintenance costs.

[0034] As a preferred option, the outer diameter of the first annular ring 513 at the bottom is larger than that of the second annular ring 514 and the third annular ring 515. This can further enhance the sealing and barrier effect at the step position. When the concrete enters the precast cavity for pouring and vibration, the first annular ring can block most of the grout from seeping into the mating gap. The remaining grout is then blocked by the second and third annular rings to prevent it from seeping into the connection position between the embedded base and the screw, ensuring that the embedded pipe can be smoothly separated from the embedded base when demolding.

[0035] Please refer to Figure 6-7The embedded pipe 52 includes an upper sealing pipe 521 and a lower threaded pipe 522. The sealing pipe 521 and threaded pipe 522 are preferably made of non-metallic materials, such as polyamide or polypropylene, which can save production costs and meet usage requirements. The sealing pipe 521 and threaded pipe 522 are integrally formed. The top of the embedded pipe 52 is completely sealed by the sealing pipe 521 to prevent concrete from entering the embedded pipe 52. The bottom of the embedded pipe 52 is press-fitted into the embedded base 51. During use, the embedded pipe 52 is manually hammered vertically into the embedded base 51 to achieve a rigid interference connection. A stepped cover 523 is provided below the threaded pipe 522. The stepped cover 523 can cooperate with the step 511 of the embedded base 51 to accurately limit the installation position of the embedded pipe, ensuring that the verticality of the embedded pipe meets the preset requirements after installation and preventing subsequent grouting hole deviation. like Figure 8 As shown, under normal conditions, the blind hole 7 on the tube segment 6 is screwed in through the external sealing plug 53. The circumference of the sealing plug 53 is provided with threads that are compatible with the threaded tube 522. After the sealing plug 53 is screwed in, the blind hole 7 is sealed to prevent mud, sand and debris from entering the interior when the tube is not in use. The inner top wall of the stepped cover 523 is provided with annular anti-retraction teeth 525. Similarly, the mounting surface of the sealing plug is also provided with matching anti-retraction teeth. The upper and lower anti-retraction teeth restrain each other to prevent loosening and avoid the sealing plug from coming out due to vibration, thereby improving the connection stability.

[0036] To improve the pre-embedded stability of the pre-embedded pipe 52 within the pipe segment 6, multiple fins 524 are arrayed around the threaded pipe 522. The fins 524 are arranged along the length of the threaded pipe 522, which can increase the contact area between the pre-embedded pipe 52 and the molded concrete pipe segment 6 substrate, improve the gripping force of the pre-embedded pipe 52 within the pipe segment 6, and ensure that the pre-embedded pipe 52 can remain stably inside the pipe segment 6 during demolding, without coming out with the pre-embedded base 51, further improving the reliability of the device.

[0037] During prefabrication, the embedded base 51 is first fixed to the corresponding position of the bottom mold 3 using screws 512. Then, the embedded pipe 52 is inserted into the embedded base 51. After assembling the reserved mechanism 5, the upper mold 4 is assembled to complete the assembly of the entire mold. Concrete grout is then injected into the prefabrication cavity 31 through the pouring hole 41 of the upper mold 4. Pouring is stopped when the grout steadily overflows from the overflow hole 42. Curing is then carried out according to the process requirements. After the concrete has fully cured and formed, demolding is performed. Demolding is carried out using a crane and segment suction cups. This process is the existing demolding and transportation method, which will not be described in detail here. Understandably, before assembly, the precast cavity 31 is filled with embedded bars in sequence. After the embedded bars are tied and positioned, reinforcing bars are set around the reserved mechanism 5 to prevent the embedded pipe 52 from tilting or shifting. Then the mold closing operation is carried out. The whole operation process conforms to the existing process sequence of precast concrete pipe segment production. There is no need to carry out large-scale modification of the original production line, and it has strong adaptability.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A pre-casting device for grouting holes in concrete segments, comprising a bottom mold and an upper mold adapted to the bottom mold, wherein the bottom mold and the upper mold cooperate to form a precast cavity for the segment, characterized in that, The bottom mold has a grouting hole pre-reservation mechanism at the arc-shaped center. The pre-reservation mechanism includes a pre-embedded base fixed on the bottom mold and a pre-embedded pipe extending vertically into the pipe segment. The bottom of the pre-embedded pipe is interference-fitted with the pre-embedded base. When demolding, the pre-embedded base and the pre-embedded pipe separate vertically.

2. The pre-casting device for grouting holes in concrete segments according to claim 1, characterized in that, The embedded base is a cylindrical structure made of nylon. The embedded base is surrounded by steps for limiting the position. A first annular ring is provided below the steps, and a second annular ring and a third annular ring are provided above the steps. The outer diameter of the first annular ring is larger than the outer diameter of the second and third annular rings.

3. The pre-casting device for grouting holes in concrete segments according to claim 1 or 2, characterized in that, A screw rod extends through the center of the embedded base and is detachably connected to the bottom mold.

4. The pre-casting device for grouting holes in concrete segments according to claim 1, characterized in that, The pre-embedded pipe includes an upper closed sealing pipe and a lower threaded pipe. The sealing pipe and the threaded pipe are integrally formed. A stepped cover is provided below the threaded pipe, and the inner top wall of the stepped cover is provided with annular anti-reverse teeth.

5. The pre-casting device for grouting holes in concrete segments according to claim 4, characterized in that, The threaded tube is also surrounded by a plurality of fins arranged in an array along the length of the threaded tube.

6. The pre-casting device for grouting holes in concrete segments according to claim 5, characterized in that, The embedded pipe covers the embedded base, and the overall length of the embedded pipe is less than the thickness of the pipe segment.

7. The pre-casting device for grouting holes in concrete segments according to claim 1, characterized in that, The bottom mold has its opening facing downwards and is fixed to the base by multiple columns.

8. The pre-casting device for grouting holes in concrete segments according to claim 7, characterized in that, The surface of the upper mold is provided with a pouring hole and an overflow hole that connect to the precast cavity.

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