Tunnel prefabricated mid-partition bottom node and construction method thereof

Abstract

The invention relates to a tunnel prefabricated middle partition wall bottom joint and a construction method thereof. The tunnel prefabricated middle partition wall bottom joint comprises a middle box culvert, a middle partition wall, a threaded rod, a lower nut and an upper connecting part. The middle partition wall is perpendicular to the top face of the middle box culvert, a plurality of notches distributed in the two sides of the middle partition wall in the extending direction of the middle partition wall are formed in the bottom of the middle partition wall, the lower ends of the threaded rods are fixed to the top of the middle box culvert, and the threaded rods correspond to the notches in a one-to-one mode. The upper portion of the upper connecting part is fixed in the middle partition wall, the lower portion of the upper connecting part is a bottom plate and located in the notches, the bottom plate is arranged outside the threaded rod in a sleeving mode and abuts against the lower nut, and the height of an installation space defined by the bottom plate and the middle partition wall is larger than or equal to the height of the threaded rod protruding out of the bottom plate. The threaded rods and the lower nuts are arranged in the middle box culvert, the bottom plate arranged on the threaded rods in a sleeving mode and connected with the lower nuts in an abutting mode is arranged on the middle partition wall, the middle partition wall can be rapidly positioned in a sleeving mode, and the posture of the middle partition wall can be rapidly and accurately adjusted by screwing the lower nuts.

Description

Technical Field

[0001] The present invention relates to the technical field of large-diameter tunnel construction, in particular to a bottom node of a prefabricated tunnel partition wall and a construction method thereof. Background Art

[0002] Single-hole double-track is a common form of large-diameter shield tunnel, and the middle partition wall is an indispensable part of the single-hole double-track tunnel. The connection method at the bottom determines the stress performance and safety reserve of the middle partition wall. Currently, the bottom node of the middle partition wall is usually cast in situ with embedded reinforcement or with a pre-buried sleeve of the lower middle box culvert and connected with bolts. When installing the middle partition wall, the middle partition wall is hoisted to the site, so the posture of the middle partition wall is a natural drooping posture under the action of gravity, but the posture of the middle box culvert at the bottom needs to be adjusted according to the actual situation of the tunnel during installation. Therefore, after the middle partition wall is hoisted to the site, the posture of the middle partition wall needs to be adjusted to match the posture of the previous middle partition wall and the posture of the bottom middle box culvert.

[0003] At present, the posture of the middle partition wall is usually adjusted by padding steel plates at the bottom of the middle partition wall. The posture of the middle partition wall is limited by the thickness of the on-site steel plate. The posture adjustment is difficult and will cause certain installation errors. How to obtain a bottom node with simple construction process and high construction quality is a major problem in the current prefabricated middle partition wall nodes. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a bottom node of a prefabricated tunnel middle partition wall and a construction method thereof. By providing a threaded rod and a lower nut fixed to the top of the middle box culvert, a bottom plate is provided at the bottom of the middle partition wall, which is sleeved on the threaded rod and abuts against the lower nut, and a space for installation is reserved. During installation, the middle partition wall can be quickly positioned by sleeved installation, and the posture of the middle partition wall can be quickly and accurately adjusted by twisting the lower nut. This has the advantages of high installation efficiency and high installation precision.

[0005] A tunnel prefabricated middle partition wall bottom node, comprising a middle box culvert, a middle partition wall, a plurality of threaded rods, a plurality of lower nuts and a plurality of upper connecting parts; the middle partition wall is located above the middle box culvert and is arranged perpendicular to the top surface of the middle box culvert, the bottom of the middle partition wall is provided with a plurality of notches, and the plurality of notches are distributed on both sides of the middle partition wall along the extension direction of the middle partition wall, the lower ends of the threaded rods are fixed to the top of the middle box culvert, the positions of the plurality of threaded rods correspond to the positions of the plurality of notches, the plurality of lower nuts are respectively threadedly connected to the plurality of threaded rods, the upper part of the upper connecting part is fixed in the middle partition wall, the lower part of the upper connecting part is a bottom plate and is provided with connecting holes, the plurality of bottom plates are respectively located in the plurality of notches, the bottom plate is sleeved outside the threaded rods and abuts against the lower nuts, the bottom plate and the middle partition wall form an installation space, the height of the installation space is ≥ the height of the threaded rod protruding from the bottom plate.

[0006] The present invention's prefabricated tunnel partition wall bottom node is secured to the top of the box culvert with a threaded rod and lower nut. A base plate is provided at the bottom of the wall, which sleeves over the threaded rod and abuts the lower nut. Installation space is reserved. This allows the wall to be quickly positioned during installation, and the wall's posture can be quickly and accurately adjusted by turning the lower nut. This provides the advantages of high installation efficiency and precision.

[0007] Furthermore, the invention further comprises a plurality of upper nuts, each of which is threadably engaged with a plurality of the threaded rods. The upper nuts are located above the base plate and abut against the base plate, and the height of the installation space is ≥ (the height of the threaded rod protruding from the base plate + the height of the upper nuts). By providing the upper nuts on the base plate and defining the height of the installation space, after the posture of the middle partition wall is adjusted, the upper nuts can be screwed into the threaded rods until they abut against the base plate, thereby achieving a preliminary fixation of the posture of the middle partition wall.

[0008] Furthermore, the upper connecting portion is integrally formed with the middle partition wall. The upper connecting portion is a beam shoe connector, which includes a bottom plate and two vertical plates. The two vertical plates intersect and are fixed to the bottom plate. The upper portions of the two vertical plates are located within the middle partition wall, and the lower portions of the two vertical plates are located within the notch. The integral formation of the upper connecting portion and the middle partition wall improves the on-site construction efficiency of the middle partition wall.

[0009] Furthermore, the invention further comprises a plurality of lower connecting parts, which are embedded and fixed in the top of the middle box culvert. The top end of the lower connecting part protrudes from the top of the middle box culvert and is provided with a threaded connection groove. The threaded connection groove is threadedly connected to the lower end of the threaded rod, and the lower end of the threaded rod abuts the bottom of the threaded connection groove. The lower connecting part and the middle box culvert are integrally formed. By pre-embedding the lower connecting part with the threaded connection groove in the top of the middle box culvert, it is convenient to fix the threaded rod to the top of the middle box culvert during on-site construction, thereby improving on-site construction efficiency.

[0010] Furthermore, the lower connecting part includes an anchor and a mechanical joint, the anchor includes a reinforcing plate and an anchor rod, the lower end of the anchor rod is fixed to the top side of the reinforcing plate, the upper end of the anchor rod is connected to the lower end of the mechanical joint, and the upper end of the mechanical joint is provided with a threaded connection groove.

[0011] Furthermore, the invention further includes a lap steel bar, which is located within the middle partition wall and integrally formed with the middle partition wall. The lower portion of the lap steel bar is fixed to the upper portion of the upper connecting portion, and the upper portion of the lap steel bar is fixed to the lower portion of the main steel bar located within the middle partition wall. By providing the lap steel bar connected to both the main steel bar and the upper connecting portion of the middle partition wall, the strength and structural stability of the middle partition wall between the lower connecting portion and the main steel bar are enhanced after the middle partition wall is formed.

[0012] The present invention also provides a method for constructing a bottom node of a prefabricated tunnel partition wall as described above, comprising the following steps:

[0013] Fixing the upper connecting parts to the middle partition wall, lifting and transporting the middle partition wall to the upper part of the middle box culvert to be assembled;

[0014] Fixing a plurality of the threaded rods on the top of the middle box culvert and installing a plurality of the lower nuts;

[0015] Finely adjust the position of the middle partition wall so that the positions of the connection holes of the bottom plates correspond to the positions of the threaded rods, then move the middle partition wall downward so that the threaded rods pass through the through holes and the bottom plates abut against the lower nuts;

[0016] Screwing a number of the lower nuts to fine-tune the posture of the middle partition wall;

[0017] At the bottom of the central partition wall, a formwork is supported and concrete is poured along the direction in which the central partition wall extends, with the pouring height being greater than or equal to the height of the notch. After the poured concrete reaches the required strength, the support formwork is removed, completing the construction of the bottom node of the tunnel prefabricated central partition wall. The method for constructing the bottom node of a tunnel prefabricated central partition wall of the present invention can effectively achieve rapid construction of the bottom node of the central partition wall, simplify the current construction sequence of the bottom node of the central partition wall, and improve the construction quality of the bottom node of the central partition wall.

[0018] Furthermore, when the bottom node of the prefabricated middle partition wall of the tunnel includes an upper nut, the following steps are also included: after fine-tuning the posture of the middle partition wall, several of the upper nuts are screwed onto several of the threaded rods, and the upper nuts are tightened so that the upper nuts abut against the upper part of the bottom plate.

[0019] Furthermore, the method of fine-tuning the posture of the middle partition wall by screwing several of the lower nuts includes the following steps: screwing the lower nuts arranged near the two ends of the middle partition wall according to the tunnel axis and the elevation angle of the middle box culvert, and then screwing the lower nuts located on both sides of the middle partition wall according to the inclination angle of the previous assembled middle partition wall.

[0020] Furthermore, the method further comprises the following steps: after pouring the concrete, vibrating the poured concrete with a vibrating rod to control the concrete, which is beneficial to ensuring the density of the backfill concrete.

[0021] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of the bottom node of a prefabricated tunnel partition wall according to an embodiment;

[0023] Figure 2 This is a schematic diagram of the partial structure of the bottom node of the prefabricated tunnel partition wall according to one embodiment;

[0024] Figure 3 This is a schematic diagram of the partial structure of the bottom node of the prefabricated tunnel partition wall according to one embodiment;

[0025] Figure 4 This is a schematic diagram of the local structure of the bottom node of the prefabricated tunnel partition wall after casting according to one embodiment;

[0026] Among them, the middle partition wall 1, the gap 11, the upper connecting part 2, the bottom plate 21, the vertical plate 22, the overlapping steel bars 3, the middle box culvert 4, the lower connecting part 5, the reinforcing plate 511, the anchor rod 512, the mechanical joint 52, the threaded rod 6, the lower nut 7, and the upper nut 8. DETAILED DESCRIPTION

[0027] It should be clear that the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the embodiments of the present application.

[0028] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the embodiments of the present application. The singular forms "a," "the," and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0029] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0030] In addition, in this application, unless otherwise specified, "plurality" refers to two or more. "And / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0031] It should be understood that the embodiments of the present application are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the embodiments of the present application is limited only by the appended claims.

[0032] The embodiment of the present invention takes a prefabricated middle partition wall 1 to be assembled on a prefabricated middle box culvert 4 during the construction process as an example, and provides a bottom node of a tunnel prefabricated middle partition wall 1. Figures 1 to 3, including a middle partition wall 1, 8 upper connecting parts 2, 8 sets of overlapping steel bars 3, a middle box culvert 4, 8 lower connecting parts 5, 8 threaded rods 6, 8 lower nuts 7, and 8 upper nuts 8; the middle partition wall 1 of the embodiment of the present invention is located above the middle box culvert 4 and is arranged perpendicular to the top surface of the middle box culvert 4, and the middle partition wall 1 is located on the vertical bisector in the extension direction of the middle box culvert 4, the 8 upper connecting parts 2 and the 8 sets of overlapping steel bars 3 are all integrally formed with the middle partition wall 1, and the 8 lower connecting parts 5 are integrally formed with the top of the middle box culvert 4, so that the upper connecting part 2 and the middle partition wall 1 are integrally formed, and the lower connecting part 5 and the middle box culvert 4 are integrally formed, which is conducive to improving on-site construction efficiency. The one-piece forming setting described in the embodiment of the present invention refers to an one-piece forming setting by pouring concrete, but the fixing method between the various structures by pouring one-piece forming is not limited to fixing by pouring;

[0033] The middle partition wall 1 includes an integrally formed main steel bar (not shown), and eight notches 11 are provided at the bottom of the middle partition wall 1. The eight notches 11 are evenly distributed on both sides of the middle partition wall 1 along the direction in which the middle partition wall 1 extends. The positions of the four notches 11 on one side of the middle partition wall 1 correspond to the positions of the four notches 11 on the other side of the middle partition wall 1 and are not connected. That is, four pairs of notches 11 are formed in the direction in which the middle partition wall 1 extends, two pairs of notches 11 being respectively located near the starting end and the end end of the extension of the middle partition wall 1, and the remaining two pairs of notches 11 being respectively located near the aforementioned two pairs of notches 11.

[0034] The positions of the eight upper connecting parts 2 correspond to the positions of the eight notches 11. The upper connecting part 2 of the embodiment of the present invention is a beam shoe connecting member, which includes a bottom plate 21 and two vertical plates 22. The bottom plate 21 is located in the notch 11 and the bottom surface of the bottom plate 21 is flush with the bottom surface of the middle partition wall 1. The bottom plate 21 and the middle partition wall 1 form an installation space, which is part of the notch 11. A connecting hole (not shown) is provided in the middle of the bottom plate 21. The bottoms of the two vertical plates 22 are both vertically fixed to the bottom plate 21. The two vertical plates 22 intersect and are arranged perpendicular to each other, one of the vertical plates 22 is arranged parallel to the outer side of the middle partition wall 1, and the other vertical plate 22 is arranged toward the outer side of the closest middle partition wall 1, dividing the vertical plates 22 into upper and lower parts. The upper parts of the two vertical plates 22 are fixed in the middle partition wall 1, and the lower parts of the two vertical plates 22 are located in the notch 11.

[0035] The positions of the eight sets of overlapping steel bars 3 correspond to the positions of the eight upper connecting parts 2, and the overlapping steel bars 3 are evenly divided into upper and lower parts. The lower part of each overlapping steel bar 3 is located between the two mutually perpendicular vertical plates 22 of the corresponding upper connecting part 2. Before the middle partition wall 1 is cast, the upper part of each overlapping steel bar 3 is fixed to the lower part of the main steel bar located in the middle partition wall 1 by welding, and the lower part of each overlapping steel bar 3 is fixed to the corresponding two vertical plates 22 by welding. By providing overlapping steel bars 3 connected to the main steel bars and the upper connecting parts 2 of the middle partition wall 1, the strength and structural stability of the middle partition wall 1 between the lower connecting part 5 and the main steel bars are improved after the middle partition wall 1 is formed.

[0036] The positions of the eight lower connecting parts 5 correspond to the positions of the eight upper connecting parts 2. The lower connecting part 5 of the embodiment of the present invention includes an anchor and a mechanical joint 52. The anchor is located inside the top of the middle box culvert 4. The anchor includes a reinforcing plate 511 and an anchor rod 512. The lower end of the anchor rod 512 is fixed to the top side of the reinforcing plate 511. The anchor rod 512 is arranged perpendicular to the top side of the middle box culvert 4. The reinforcing plate 511 is arranged parallel to the top side of the middle box culvert 4. The direction in which the mechanical joint 52 extends is collinear with the direction in which the anchor rod 512 extends. The lower end of the mechanical joint 52 is fixed to the anchor rod 512. The upper end of the mechanical joint 52 is connected, and the upper end of the mechanical joint 52 protrudes from the top of the middle box culvert 4. The upper end surface of the mechanical joint 52 is provided with a threaded connection groove, and the direction in which the threaded connection groove extends is collinear with the direction in which the mechanical joint 52 extends; a lower connecting part 5 with a threaded connection groove is pre-embedded in the top of the middle box culvert 4, which is convenient for fixing the threaded rod 6 to the top of the middle box culvert 4 during on-site construction, thereby improving on-site construction efficiency; it should be noted that the height of the upper end of the mechanical joint 52 protruding from the top of the middle box culvert 4 is not limited to the higher height shown in the accompanying drawings, and can be selected according to construction needs.

[0037] The lower ends of the 8 threaded rods 6 are respectively threadedly matched with the 8 threaded connection grooves, and the lower ends of the 8 threaded rods 6 are all abutted against the bottom of the threaded connection grooves. The upper ends of the 8 threaded rods 6 are respectively passed through the 8 connection holes and are located in the installation space.

[0038] The eight lower nuts 7 are respectively threadedly connected to the eight threaded rods 6. The lower nuts 7 are located between the middle box culvert 4 and the bottom plate 21 and abut against the bottom plate 21. The eight upper nuts 8 are respectively threadedly connected to the eight threaded rods 6. The upper nuts 8 are located in the installation space and abut against the bottom plate 21. When in use, the upper nuts 8 are not tightened or screwed onto the threaded rods 6 first. After adjusting the posture of the middle partition wall 1 by unscrewing the nuts 7, the upper nuts 8 are tightened or screwed onto the threaded rods 6 and tightened.

[0039] In the embodiment of the present invention, in order to make the proportion of the prefabricated part of the middle partition wall 1 as large as possible, the height of the installation space is made ≥ the height of the threaded rod 6 protruding from the bottom plate 21. Therefore, when installing the upper nut 8, if it is impossible to directly place the upper nut 8 above the threaded rod 6, the middle partition wall 1 can be properly lifted first to allow enough space for the upper nut 8 to be screwed onto the threaded rod 6. In other embodiments, in order to facilitate the installation of the upper nut 8, the height of the installation space can also be made ≥ (the height of the threaded rod 6 protruding from the bottom plate 21 + the height of the upper nut 8), so that after the posture adjustment of the middle partition wall 1 is completed, the upper nut 8 can be directly screwed into the threaded rod 6 until it abuts against the bottom plate 21.

[0040] The embodiment of the present invention provides a threaded rod 6 and a lower nut 7 fixed to the top of the middle box culvert 4, and a bottom plate 21 is provided at the bottom of the middle partition wall 1, which is sleeved on the threaded rod 6 and abutted against the lower nut 7, and an installation space is reserved, so that the middle partition wall 1 can be quickly positioned by sleeved during installation, and the posture of the middle partition wall 1 can be quickly and accurately adjusted by screwing the lower nut 7, which effectively solves the problems of high assembly quality requirements, poor actual anchoring effect, and the need for cast-in-place reinforcement in the construction process of the bottom node of the existing middle partition wall 1, realizes the rapid construction of the bottom node of the middle partition wall 1, simplifies the connection form between the middle partition wall 1 and the bottom middle box culvert 4, and significantly improves the construction efficiency of the top node of the middle partition wall 1, with the advantages of high installation efficiency and high installation precision.

[0041] On the other hand, the present invention also provides a method for constructing the bottom node of any of the above-mentioned prefabricated tunnel partition walls 1, comprising the following steps:

[0042] According to the structure of the bottom node, a middle partition wall 1 is formed integrally with each upper connection part 2 and each lap steel bar 3 and provided with each notch 11, and a middle box culvert 4 is formed integrally with each lower connection part 5.

[0043] Assemble the middle box culvert 4 to the preset position in the tunnel, lift and transport the middle partition wall 1 to the top of the middle box culvert 4 to be assembled;

[0044] Screw each threaded rod 6 onto each threaded connection groove at the top of the middle box culvert 4, ensuring that the lower end of the threaded rod 6 abuts against the bottom of the threaded connection groove, and then screw each lower nut 7 onto each threaded rod 6;

[0045] Fine-tune the position of the middle partition wall 1 so that the positions of the connection holes of each bottom plate 21 correspond to the positions of each threaded rod 6. Then, move the middle partition wall 1 downward so that each threaded rod 6 passes through each through-hole. Then, make the lower nut 7 contact the bottom plate 21.

[0046] The posture of the middle partition wall 1 is fine-tuned by screwing the lower nuts 7. The method for fine-tuning the posture of the middle partition wall 1 comprises the following steps: according to the elevation angle of the tunnel axis and the middle box culvert 4, screwing the lower nuts 7 arranged near the two ends of the middle partition wall 1 so that the elevation angle of the middle partition wall is the same as the elevation angle of the lower middle box culvert; then, according to the inclination angle of the previous middle partition wall 1, screwing the lower nuts 7 located on both sides of the middle partition wall 1 so that the inclination angle of the middle partition wall is consistent with that of the previous middle partition wall;

[0047] Screw each upper nut 8 onto each threaded rod 6 and tighten the upper nut 8 so that the upper nut 8 abuts against the upper portion of the bottom plate 21;

[0048] Carry out the construction of the top node of the middle partition wall 1. After the middle partition wall 1 is constructed for at least 100m, support the formwork at the bottom of the middle partition wall 1 along the extension direction of the middle partition wall 1, pour concrete and use a vibrating rod to control the pouring concrete. The pouring height should be ≥ the height of the gap 11. For further information on the pouring position and structure, please refer to Figure 4 After the poured concrete strength reaches the requirement, the support formwork is removed and the construction of the bottom node of the tunnel prefabricated partition wall 1 is completed.

[0049] The construction method of the bottom node of the tunnel prefabricated middle partition wall according to the embodiment of the present invention can effectively realize the rapid construction of the bottom node of the middle partition wall, simplify the current construction sequence of the bottom node of the middle partition wall, avoid large-scale rebar planting and cast-in-place projects, and improve the construction quality of the bottom node of the middle partition wall.

[0050] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A bottom node of a prefabricated tunnel partition wall, characterized in that: It includes a middle box culvert, a middle partition wall, a plurality of threaded rods, a plurality of lower nuts and a plurality of upper connecting parts; the middle partition wall is located above the middle box culvert and is arranged perpendicular to the top surface of the middle box culvert, the bottom of the middle partition wall is provided with a plurality of notches, and the plurality of notches are distributed on both sides of the middle partition wall along the extension direction of the middle partition wall, the lower end of the threaded rod is fixed to the top of the middle box culvert, the positions of the plurality of threaded rods correspond to the positions of the plurality of notches, and the plurality of lower nuts are respectively threadedly connected to the plurality of threaded rods, the upper part of the upper connecting part is fixed in the middle partition wall, the lower part of the upper connecting part is a bottom plate and is provided with connecting holes, and the plurality of bottom plates are respectively located in the plurality of notches, the bottom plate is sleeved outside the threaded rod and abuts against the lower nuts, the bottom plate and the middle partition wall form an installation space, and the height of the installation space is ≥ the height of the threaded rod protruding from the bottom plate.

2. The bottom node of the prefabricated tunnel partition wall according to claim 1, characterized in that: It also includes a plurality of upper nuts, which are respectively threadedly engaged with a plurality of threaded rods. The upper nuts are located above the base plate and abut against the base plate. The height of the installation space is ≥ (the height of the threaded rod protruding from the base plate + the height of the upper nuts).

3. The bottom node of the prefabricated tunnel partition wall according to claim 1, characterized in that: The upper connecting part is integrally formed with the middle partition wall. The upper connecting part is a beam shoe connecting piece. The beam shoe connecting piece includes a bottom plate and two vertical plates. The two vertical plates intersect and are fixed on the bottom plate. The upper parts of the two vertical plates are located in the middle partition wall, and the lower parts of the two vertical plates are located in the gap.

4. The bottom node of the prefabricated tunnel partition wall according to claim 1, characterized in that: It also includes several lower connecting parts, which are embedded and fixed in the top of the middle box culvert. The top of the lower connecting part protrudes from the top of the middle box culvert and is provided with a threaded connecting groove. The threaded connecting groove is threadedly connected to the lower end of the threaded rod, and the lower end of the threaded rod abuts against the bottom of the threaded connecting groove. The lower connecting part and the middle box culvert are integrally formed.

5. The bottom node of the prefabricated tunnel partition wall according to claim 4, characterized in that: The lower connecting part includes an anchor and a mechanical joint. The anchor includes a reinforcing plate and an anchor rod. The lower end of the anchor rod is fixed to the top side of the reinforcing plate, and the upper end of the anchor rod is connected to the lower end of the mechanical joint. The upper end of the mechanical joint is provided with a threaded connection groove.

6. The bottom node of the prefabricated tunnel partition wall according to claim 1, characterized in that: It also includes lap steel bars, which are located in the middle partition wall and are integrally formed with the middle partition wall. The lower part of the lap steel bars is fixed to the upper part of the upper connecting part, and the upper part of the lap steel bars is fixed to the lower part of the main steel bars located in the middle partition wall.

7. A method for constructing a bottom node of a prefabricated tunnel partition wall according to any one of claims 1 to 6, characterized in that: The following steps are involved: Fixing the upper connecting parts to the middle partition wall, lifting and transporting the middle partition wall to the upper part of the middle box culvert to be assembled; Fixing a plurality of the threaded rods on the top of the middle box culvert and installing a plurality of the lower nuts; Finely adjust the position of the middle partition wall so that the positions of the connection holes of the bottom plates correspond to the positions of the threaded rods, then move the middle partition wall downward so that the threaded rods pass through the through holes and the bottom plates abut against the lower nuts; Screwing a number of the lower nuts to fine-tune the posture of the middle partition wall; At the bottom of the middle partition wall, formwork is supported and concrete is poured along the direction in which the middle partition wall extends. The pouring height is ≥ the height of the notch. After the strength of the poured concrete reaches the requirement, the supporting formwork is removed to complete the construction of the bottom node of the tunnel prefabricated middle partition wall.

8. The method for constructing the bottom node of the prefabricated tunnel partition wall according to claim 7, characterized in that: When the bottom node of the prefabricated tunnel partition wall includes an upper nut, the following steps are also included: after fine-tuning the posture of the middle partition wall, several of the upper nuts are screwed onto several of the threaded rods, and the upper nuts are tightened so that the upper nuts abut against the upper part of the bottom plate.

9. The method for constructing the bottom node of the prefabricated tunnel partition wall according to claim 7, characterized in that: The method of fine-tuning the posture of the middle partition wall by screwing several of the lower nuts includes the following steps: screwing the lower nuts arranged near the two ends of the middle partition wall according to the elevation angle of the tunnel axis and the middle box culvert, and then screwing the lower nuts located on both sides of the middle partition wall according to the inclination angle of the previous assembled middle partition wall.

10. The construction method of the bottom node of the prefabricated tunnel partition wall according to claim 7, characterized in that: The following steps are also included: After pouring the concrete, a vibrating rod is used to control the vibration of the poured concrete.

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