Large-diameter shield internal prefabricated assembly structure

Abstract

The utility model relates to a shield internal structure design technology in the field of tunnel engineering, in particular to a large-diameter shield internal prefabricated assembly structure. The structural form is composed of a middle square piece, a left door-shaped side box box and a right door-shaped side box box, the square piece is connected with the door-shaped side box boxes through tenons and mortises, each door-shaped side box box comprises a top plate, a vertical side wall and an inclined side wall, the top face of each door-shaped side box box is flush with the top face of the corresponding square piece, concrete is backfilled and compacted between each inclined side wall and a shield segment, and the top face of each door-shaped side box box and the top face of the corresponding square piece are connected with each other. Therefore, the door-shaped side box case is further tightly attached to the square piece, and the internal structure splicing effect is improved. According to the large-diameter shield internal prefabricated assembly structure, the prefabrication rate of the shield tunnel internal structure is improved, the construction period is shortened, and cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the shield internal structure design technology in the field of tunnel engineering, concretely relates to a large diameter shield internal prefabricated assembly structure. BACKGROUND

[0002] To comply with the rapid development of the country, the underground space development effort is increasing, under this background, the large diameter shield tunnel construction technology is more and more mature, and the internal structure prefabricated assembly technology research for large diameter shield tunnel has also made some progress, but it is still in the semi prefabricated stage. In the actual implementation process, many components still need to use cast-in-place technology or use post-cast wet joint form to connect the components, which leads to low prefabrication rate of the internal structure, and some still need to be connected to the segment through the embedded steel bar, which obviously damages the segment, and the construction process is complex, which restricts the improvement of construction efficiency. UTILITY MODEL CONTENT

[0003] In order to overcome the technical defects of the existing shield internal structure form, a large diameter shield internal prefabricated assembly structure form is provided, which connects the middle L-shaped piece and the left and right door-shaped side box culvert by using tenon and mortise, improves the prefabrication rate of the internal structure, effectively reduces the assembly error and improves the assembly efficiency.

[0004] In order to solve the above technical problems, the utility model provides the following technical scheme:

[0005] A large diameter shield internal prefabricated assembly structure, comprising a middle L-shaped piece and a door-shaped side box culvert, wherein the door-shaped side box culvert comprises a top plate, a vertical side wall and an inclined side wall, the middle L-shaped piece comprises an L-shaped piece side wall, an L-shaped piece top plate, and an L-shaped piece top plate, a reserved sleeve and an inspection opening are provided in the door-shaped side box culvert, and an inspection opening is provided in the middle L-shaped piece, the sleeve is embedded in the inclined side wall of the door-shaped side box culvert, the L-shaped piece side wall and the vertical side wall of the door-shaped side box culvert are respectively provided with a mortise and a tenon, the vertical length of the mortise and the tenon can be arranged only on the upper end region of the side wall, so as to ensure that the top plate of the door-shaped side box culvert is flush with the L-shaped piece top plate, a lubricating layer is coated on the surface of the mortise and the tenon, and the tenon is slid into the mortise from top to bottom to complete the assembly during assembly.

[0006] Further, the tenon and the mortise can be randomly arranged on the vertical side wall of the door-shaped side box culvert or the L-shaped piece side wall as needed, the size and the number of the tenon and the mortise are determined as needed, and the shape of the tenon can be a vertical discontinuous structure.

[0007] Further, the outer surface of the tenon is a steel layer, and a stiffened plate is arranged inside; the surface of the mortise is coated with a steel layer; and the tenon and the mortise are provided with anchoring steel bars at the rear part.

[0008] Further, the steel plate layer thickness is 5-10mm, the tenon inner edge length is 100-250mm, the tenon two sides included angle is 30-60°, the convex height is about 100mm, the mortise inner diameter size is larger than the tenon outer contour size by 5-8mm,

[0009] Further, the inclined side wall of the door-shaped side box culvert and the shield segment are backfilled with concrete, so that the door-shaped side box culvert and the intermediate H-shaped piece are further tightly fitted.

[0010] The utility model has the following beneficial effects:

[0011] The internal prefabricated assembly structure form of the intermediate H-shaped piece and the left and right door-shaped side box culverts is favorable for controlling the single size and weight, facilitating hoisting construction in a limited space, significantly improving the prefabricated assembly rate of the shield internal structure, reducing the conversion of the prefabricated and cast-in-place system, and simplifying the construction process. In the construction process, the bottom plate can make the installation of the box culvert more convenient, for example, when the box culvert needs to be placed on an existing structure, the bottom plate design can reduce the construction difficulty, and the structure self weight can be reduced. The prefabricated component structure form is improved to reduce the assembly error, the triangular area between the inclined side wall of the door-shaped side box culvert and the shield segment is backfilled with concrete, the assembly error can be adjusted and controlled; the door-shaped side box culvert and the H-shaped piece are connected through the tenon and the mortise, so that the effective connection of the door-shaped side box culvert and the H-shaped piece can be ensured; the tenon and the mortise can be arranged only on the upper end part area of the side wall, which serves as an auxiliary measure to ensure that the top plate of the door-shaped side box culvert is flush with the top plate of the H-shaped piece, reduces the assembly error, and improves the assembly quality and efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is the overall structure form section view of the utility model;

[0013] Figure 2 is the door-shaped side box culvert structure schematic view of the utility model;

[0014] Figure 3 is the tenon and mortise connection large sample view of the utility model;

[0015] Figure 4 is the H-shaped piece structure schematic view of the utility model;

[0016] Figure 5 is the overall structure form three-dimensional schematic view of the utility model;

[0017] Numbered in the figure: 1, shield segment; 2, intermediate mouth piece; 3, door-shaped side box culvert; 4, concrete backfill; 5, limiting concrete; 6, top plate; 7, vertical side wall; 8, inclined side wall; 9, tenon; 10, pre-buried sleeve; 11, access hole 1; 12, mouth piece top plate; 13, mouth piece side wall; 14, mouth piece bottom plate; 15, tenon slot; 16, access hole 2. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present application will be described below with reference to the drawings, and it should be understood that the preferred embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application. Identical reference numerals in the drawings refer to identical components throughout.

[0019] Please refer to Figures 1-4 The large-diameter shield internal prefabricated assembly structure includes intermediate mouth piece 2 and door-shaped side box culvert 3, wherein the door-shaped side box culvert 3 includes top plate 6, vertical side wall 7 and inclined side wall 8.

[0020] Further, a sleeve or access hole is reserved in the mouth piece 2 and the door-shaped side box culvert 3, the sleeve 10 is pre-buried in the inclined side wall 8 of the door-shaped side box culvert, and the access holes 11 and 16 are arranged in the side wall 13 of the intermediate mouth piece, the vertical side wall 7 of the door-shaped side box culvert and the top plate 12 of the mouth piece.

[0021] Further, the side wall 13 of the mouth piece and the vertical side wall 7 of the door-shaped side box culvert are respectively provided with tenon slot 15 and tenon 9, the vertical length of the tenon slot 15 and the tenon 9 is determined after calculation, and the tenon slot 15 and the tenon 9 can be arranged only in the upper end part area of the side wall, so as to ensure that the top plate 6 of the door-shaped side box culvert is flush with the top plate 12 of the mouth piece, reduce the assembly error, and the surface of the tenon slot 15 and the tenon 9 is smeared with lubricating material to reduce resistance, and the tenon 9 is slid into the tenon slot 15 from top to bottom to complete the assembly during assembly.

[0022] Further, the tenon 9 is preferably made of steel structure, the thickness of the steel plate is 5-10 mm, the inner length of the tenon is 100-250 mm, the angle between the two sides of the tenon is 30-60°, and the protruding height is about 100 mm, and the tenon slot 15 is preferably made of steel material, the thickness of the steel plate is 5-10 mm, and the inner diameter of the tenon slot is 5-8 mm larger than the outer contour size of the tenon, which is convenient for assembly.

[0023] Further, the inclined side wall 8 of the door-shaped side box culvert and the shield segment 1 are backfilled and compacted with concrete 4, so that the door-shaped side box culvert 3 and the mouth piece 2 are further closely attached.

[0024] In the embodiment, the outer diameter of a certain shield tunnel is 15 m, and the thickness of the segment is 650 mm, and the internal structure is as shown in Figure 1The construction process is shown. In the construction process, in order to improve the construction efficiency and improve the utilization rate of the internal space of the shield, the internal structure is made of prefabricated components, including the middle H-shaped component and the left and right door-shaped side box culverts. The large-diameter shield internal prefabricated assembly construction includes the following steps:

[0025] 1) The production of the middle H-shaped component 2 and the left and right door-shaped side box culverts 3 is completed in the prefabricated component production plant. According to the functional requirements of the shield tunnel, sleeves 10 or inspection openings 11 and 16 are reserved in the middle H-shaped component 2 and the door-shaped side box culvert 3. The sleeve 10 is embedded in the door-shaped side box culvert inclined side wall 8. The size of the sleeve is selected according to the actual situation, and the number of the sleeve is set to 1.5 times the actual number. The inspection openings include two types of inspection openings arranged on the top plate and side wall of the middle H-shaped component 2 and the vertical side wall of the left and right door-shaped side box culverts 3. The combination of the two can meet the daily maintenance work during the construction and operation of the shield tunnel.

[0026] 2) While the shield machine is advancing, the middle H-shaped component 2 is installed, and the limiting concrete 5 is poured on both sides of the H-shaped component. The H-shaped component can also serve as a construction channel to facilitate the transportation of related construction materials.

[0027] 3) The door-shaped side box culvert 3 is assembled and constructed based on the H-shaped component. The surface of the tenon 9 and the mortise 15 is coated with cement slurry to reduce resistance. The tenon 9 slides into the mortise 15 from top to bottom to complete the connection of the door-shaped side box culvert and the H-shaped component, effectively reducing the assembly error between the door-shaped side box culvert and the H-shaped component, improving the assembly efficiency and overall stability of the internal structure.

[0028] 4) The concrete 4 is poured in the triangular range between the inclined side wall of the door-shaped side box culvert and the shield segment, so that the left and right door-shaped side box culverts 3 and the middle H-shaped component 2 are more closely connected, playing the role of secondary fixing and combining the structure, and improving the assembly effect of the prefabricated assembly structure.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A large diameter shield interior prefabricated assembly structure, characterized by, The utility model relates to a kind of shield pipe piece (1) and door-shaped side box culvert (3) including intermediate I-shaped member (2), wherein door-shaped side box culvert (3) includes top plate (6), vertical side wall (7) and inclined side wall (8), the intermediate I-shaped member (2) includes I-shaped member side wall (13), I-shaped member top plate (12), I-shaped member bottom plate (14), the sleeve pipe (10) is reserved and the access hole is opened in the door-shaped side box culvert (3), the access hole is opened in the intermediate I-shaped member (2), the sleeve pipe (10) is embedded in the inclined side wall (8) of door-shaped side box culvert (3), the I-shaped member side wall (13) and the vertical side wall (7) of door-shaped side box culvert (3) are respectively provided with mortise (15) and tenon (9), mortise (15) and tenon (9) vertical length can be only set on side wall upper end area, so as to ensure that the top plate (6) of door-shaped side box culvert (3) is flush with I-shaped member top plate (12), mortise (15) and tenon (9) surface smears lubricating layer.

2. The large diameter shield interior prefabricated assembly structure according to claim 1, characterized in that, The size and quantity of the tenon (9) and mortise (15) are determined as required, and the tenon (9) can be vertically discontinuous in shape.

3. The large diameter shield interior prefabricated assembly structure according to claim 1, characterized in that, The outer surface of the tenon (9) is a steel layer, and a stiffener is arranged inside; the surface of the mortise (15) is coated with a steel layer; the tenon (9) and the mortise (15) are provided with anchoring steel bars at the rear part.

4. The large diameter shield interior prefabricated assembly structure according to claim 3, characterized in that, The thickness of the steel plate layer is 5-10 mm, the inner edge length of the tenon is 100-250 mm, the angle between the two edges of the tenon is 30-60°, the convex height is about 100 mm, and the inner diameter of the mortise (15) is 5-8 mm larger than the outer contour size of the tenon (9).

5. The large diameter shield interior precast assembly structure according to claim 1, wherein, The inclined side wall (8) of the door-shaped side box culvert (3) and the shield pipe piece (1) are backfilled and compacted with concrete (4), so that the door-shaped side box culvert (3) and the intermediate I-shaped member (2) are further closely fitted.

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