Assembly type tunnel prefabricated part splicing seam post-pouring structure

Abstract

The utility model discloses an assembly type tunnel prefabricated part splicing seam post-pouring structure which is characterized in that adjacent ends of prefabricated parts on the left side and the right side are annular splicing seams, embedded nuts are arranged on the inner sides and the outer sides of the prefabricated parts on the left side and the right side of the annular splicing seams, and inner side formworks and outer side formworks are further arranged on the inner sides and the outer sides of the prefabricated parts on the left side and the right side of the annular splicing seams respectively. Bolts penetrate through the inner side formwork and the outer side formwork and then are screwed into the embedded nuts to fix the inner side formwork and the outer side formwork, and concrete is poured in the annular splicing seam. The pre-embedded nuts are pre-embedded in the prefabricated part to serve as formwork supporting points and are used for supporting and fixing the formwork, so that construction can be conducted without erecting a support when the formwork is erected, construction is convenient and fast, accurate control over formwork positioning can be achieved through connection of the bolts and the pre-embedded nuts, and construction efficiency is improved. And a series of quality problems caused by loosening of the template in the concrete pouring process are avoided.

Description

Technical Field

[0001] The utility model relates to a prefabricated tunnel component joint post-casting structure, belonging to the technical field of prefabricated tunnel engineering. Background Art

[0002] During the construction of the joints of the prefabricated components of the assembled tunnel, wooden formwork is generally used to support the joints. The formwork is installed through various components such as round tubes, wooden squares, tension bolts, mountain-shaped clips (butterfly buckles), etc. The templates on both sides are installed at the same time. The first step is to install and lock the template while inserting the tension bolts and sleeves, and align the templates on both sides with the prefabricated components to make them stable. Then, butterfly fasteners and steel pipes are used to fix them on the back ribs, and the straightness of both sides is adjusted. Other templates are installed all the way to the top, and the butterfly fasteners are tightened with nuts to make the templates on both sides become one. The internal support is installed to adjust the template verticality, and finally concrete is poured.

[0003] The construction method of the joints of prefabricated components of the assembled tunnel is cumbersome, the site is messy, the scattered parts are difficult to recycle, and a large amount of raw materials are wasted. In addition, improper use or loosening of tension bolts and wooden planks can easily cause mold leakage, displacement of adjacent components, etc., which ultimately leads to poor vertical flatness of the cast wall and poor quality of splicing of adjacent components, which leads to water leakage in the joints and a decline in the overall quality of the project. Utility Model Content

[0004] The purpose of the utility model is to provide a prefabricated tunnel prefabricated component joint post-casting structure. By pre-embedding screw sleeves in the prefabricated components for template support and fixation, construction can be carried out without setting up brackets, which is convenient and fast, accurately controls the template positioning, and avoids a series of quality problems caused by loose templates during concrete pouring.

[0005] The technical solution of the utility model is as follows: a post-cast structure of a prefabricated tunnel component joint, wherein the adjacent ends of the prefabricated components on the left and right sides are annular joints, embedded nuts are arranged inside and outside the prefabricated components on the left and right sides of the annular joint, and inner and outer templates and outer templates are arranged inside and outside the prefabricated components on the left and right sides, respectively, bolts pass through the inner and outer templates and are screwed into the embedded nuts to fix the inner and outer templates, and concrete is poured in the annular joint.

[0006] In the aforementioned prefabricated tunnel component joint post-cast structure, the inner and outer embedded nuts are arranged alternately in the vertical direction.

[0007] In the aforementioned prefabricated tunnel component joint post-cast structure, the distance between the upper and lower embedded nuts on the same side is 100 cm.

[0008] In the aforementioned assembled tunnel prefabricated component joint post-cast structure, the inner bottom end of the embedded nut is a closed structure, and its outer wall is also provided with a threaded structure.

[0009] In the aforementioned prefabricated tunnel component joint post-cast structure, the concrete poured in the annular joint is UHPC.

[0010] The beneficial effects of the utility model: compared with the prior art, the utility model embeds pre-embedded nuts in prefabricated components as template support points for template support and fixation, so that construction can be carried out without setting up brackets when setting up the template, which is convenient and quick. The template positioning can be accurately controlled by connecting bolts and pre-embedded nuts, avoiding a series of quality problems caused by loose templates during concrete pouring. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of the embedded nut.

[0013] Figure numerals: 1-prefabricated component, 2-annular joint, 3-embedded nut, 4-inner formwork, 5-outer formwork, 6-bolt. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0015] Embodiment of the utility model: a prefabricated tunnel prefabricated component joint post-casting structure, such as Figure 1-2 As shown, the adjacent ends of the prefabricated components 1 on the left and right sides are annular joints 2, and embedded nuts 3 are provided inside and outside the prefabricated components 1 on the left and right sides of the annular joints 2. Inner formwork 4 and outer formwork 5 are also provided inside and outside the prefabricated components 1 on the left and right sides, respectively. Bolts 6 pass through the inner formwork 4 and the outer formwork 5 and are screwed into the embedded nuts 3 to fix the inner formwork 4 and the outer formwork 5, and concrete is poured in the annular joint 2.

[0016] The inner and outer embedded nuts 3 are arranged alternately in the vertical direction. During use, the embedded nuts 3 bear the gravity of the inner formwork 4 or the outer formwork 5, which is transmitted to the prefabricated component 1 through the embedded nuts 3. When the inner and outer embedded nuts 3 are set at the same height in the vertical direction, the gravity of the inner formwork 4 and the outer formwork 5 borne by the prefabricated component 1 are all in the same plane, which is easy to cause concrete damage to the prefabricated component 1. The upper and lower embedded nuts 3 on the same side are arranged with a spacing of 50 cm, and the inner formwork 4 and the outer formwork 5 are firmly fixed by multiple bolts 6, while avoiding the situation where the template and the prefabricated component 1 cannot fit tightly due to the setting of too large a spacing, which will cause leakage when pouring concrete.

[0017] The inner bottom end of the embedded nut 3 is a closed structure, that is, when the embedded nut 3 is placed in the prefabricated component 1, its inner bottom end should be closed to prevent the concrete from entering the interior of the prefabricated component 1 from the inner bottom end during the molding process, resulting in the embedded nut 3 being unusable later. The outer wall of the embedded nut 3 is also provided with a thread structure, so that the embedded nut 3 is firmly connected to the prefabricated component 1.

[0018] The concrete poured in the annular joint 2 is UHPC (ultra-high performance concrete), which can give full play to the advantages of high strength and density of UHPC, and can greatly improve the waterproof and anti-seepage performance of the post-cast joint compared with ordinary concrete.

[0019] The scheme of the utility model is explained below with reference to a specific example: the tunnel annular joint adopts a cast-in-place joint structure with a reserved annular post-casting belt: the longitudinal length of the tunnel precast segment-precast component 1 is 2.7m each, the longitudinal reinforcement at both ends is extended and exposed, and a 0.3m wide annular joint 2 is set between the segments. After the two segments are spliced, the steel bars are staggered and overlapped in the annular joint 2. The pouring of ordinary concrete is changed to pouring UHPC, and the construction is similar to the wet joint construction method of precast small box girders of bridges, but in order to meet the waterproofing requirements, a through-type tension screw cannot be set, so an embedded nut 3 is set in the precast component 1 for formwork support and fixation, and the construction can be carried out without setting up a bracket, which is convenient and quick.

[0020] The template support points are embedded in the prefabricated component 1, and embedded nuts 3 are used. During the prefabrication stage in the factory, the embedded nuts 3 are staggered with a spacing of 100 cm on the inner and outer sides of the side wall flanges of the prefabricated component 1. The length can be designed and manufactured according to the wall thickness. The embedded nuts 3 are made of 8.8 grade low-carbon alloy steel.

[0021] Holes are preset on the inner template 4 and the outer template 5, and the holes correspond to the embedded nuts 3 on the prefabricated components 1 one by one. The template can be reused for easy turnover. The template is connected to the adjacent prefabricated components 1 by bolts 6, so that the template, the left prefabricated component, and the right prefabricated component form a whole, ensuring that the template will not move and accurately controlling the thickness and shape of the post-cast joints. The reserved annular joint 2 is cast with UHPC, which can give full play to the advantages of UHPC's high strength and density, and can greatly improve the waterproof and anti-seepage performance of the post-cast joints compared to ordinary concrete.

[0022] The utility model embeds the template support point - embedded nut 3 in the prefabricated component 1 for template support and fixation, and can be constructed without setting up a bracket, which is convenient and quick. The template positioning can be accurately controlled by connecting the embedded nut 3 and the bolt 6, avoiding a series of quality problems caused by loose template during concrete pouring.

[0023] And the structure of the utility model also has the following advantages:

[0024] The installation accuracy requirement for the prefabricated component 1 is relatively low, and the longitudinal temporary and permanent prestressing of the tunnel is avoided, so that the construction is convenient and fast, and the construction efficiency is improved;

[0025] Since the municipal open-cut tunnel has both horizontal and vertical curves, the horizontal and vertical curves can be adjusted by the post-cast strip of the annular joint 2, and the prefabricated components 1 are standardized as much as possible to facilitate factory production;

[0026] The pull-out piles can be set at the post-casting zone of the annular joint 2, which solves the problem of connecting the pull-out piles with the main structure of the tunnel:

[0027] The foundation pit support can be set at the annular post-casting belt of the annular joint 2 to solve the conflict between the inner support and the side wall. The main structure of the tunnel is closed into a ring, and the relevant components of the foundation pit are removed and then the hole is sealed by post-casting, supplemented by necessary waterproofing measures;

[0028] Engineering practice has proved that the dry-joining method has high requirements for assembly precision, is very difficult to assemble on site, and it is difficult to make the joints tight. The use of UHPC annular post-cast strips can give full play to the advantages of UHPC's high strength and density, and the waterproof effect is better than the dry-joining solution.

Claims

1. A post-cast structure of prefabricated tunnel components, wherein the adjacent ends of the prefabricated components (1) on the left and right sides are circumferential joints (2), characterized in that: Embedded nuts (3) are provided inside and outside the prefabricated components (1) on the left and right sides of the annular joint (2); inner templates (4) and outer templates (5) are also provided inside and outside the prefabricated components (1) on the left and right sides, respectively; bolts (6) pass through the inner template (4) and the outer template (5) and are screwed into the embedded nuts (3) to fix the inner template (4) and the outer template (5); and concrete is poured in the annular joint (2).

2. The post-cast structure of the assembled tunnel prefabricated component joint according to claim 1 is characterized by: The inner and outer embedded nuts (3) are arranged alternately in the vertical direction.

3. The post-cast structure of the assembled tunnel prefabricated component joint according to claim 1 is characterized by: The distance between the upper and lower embedded nuts (3) on the same side is 100 cm.

4. The post-cast structure of the assembled tunnel prefabricated component joint according to claim 1 is characterized by: The inner bottom end of the embedded nut (3) is a closed structure, and its outer wall is also provided with a thread structure.

5. The post-cast structure of the assembled tunnel prefabricated component joint according to claim 1 is characterized by: The concrete poured into the annular joint (2) is UHPC.

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