Assembly type prefabricated open caisson

Abstract

The utility model discloses an assembly type prefabricated open caisson which comprises an annular base, a plurality of layers of annular walls are installed on the upper side of the base in an assembled mode, each layer of annular wall is formed by splicing a plurality of arc-shaped pipe pieces, and the pipe pieces corresponding to the upper layer of annular wall and the lower layer of annular wall are staggered. First positioning columns are fixed to the pipe pieces in an embedded mode, semi-circular grooves are formed in the end sides of the pipe pieces, and the corresponding semi-circular grooves of the adjacent pipe pieces are spliced to form first positioning grooves for the first positioning columns to be inserted. Compared with a traditional construction mode that cast-in-place is conducted through formworks, the well body pipe piece adopts a factory prefabrication construction mode, the influence of the environment is avoided, construction is fast, and the error rate is low. The inserting depth of the first positioning columns reaches the middle position in the first positioning groove, the first positioning groove not only accommodates the first positioning columns corresponding to the lower layer, but also accommodates the first positioning columns on the upper layer, and the cement mortar can fill the gap, so that the sealing performance is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of engineering building structures, and in particular relates to a prefabricated caisson. Background Technology

[0002] Caisson construction is a commonly used construction technique in municipal engineering. For a long time, on-site fabrication of caissons has been widely adopted. However, this technique has the following limitations when operating in urban areas: **Construction Period:** Under normal circumstances, each section of a working caisson is about 7 meters long. From the start of formwork construction to completion of pouring and curing to the point where it is ready for sinking, it takes 20-25 days. This period is on the critical path of the project and cannot be shortened. Furthermore, in urban areas, especially on semi-closed roads, there are significant traffic safety hazards during this period. **Quality:** The quality of caisson construction has a significant impact on subsequent pipe jacking operations. During on-site fabrication of caissons, key quality control points such as steel reinforcement installation, formwork installation, concrete pouring, and curing must be strictly controlled; otherwise, the subsequent pipe jacking operation cannot be guaranteed. **Safety and Environmental Protection:** Constructing caissons on urban roads presents safety challenges in areas such as scaffolding installation and dismantling, steel reinforcement installation, hoisting, concrete pouring, and personnel working at heights. Dust and noise pollution are also significant concerns.

[0003] Caisson construction is used for the construction of underground water wells, reservoirs, and sewage settling tanks. Using settlement construction avoids the need for ground-level pile foundations, preventing the risk of collapse due to loose soil. Current caisson construction involves first pouring the bottom shaft, erecting formwork, and then pouring concrete. After the concrete solidifies, internal excavation is carried out to allow for uniform settlement. Once the top edge is level with the ground surface, a new shaft is poured on top. This construction method is relatively convenient to some extent, but the formwork erection and pouring processes significantly impact work time, and the formwork for ring-shaped caissons is difficult to erect. Utility Model Content

[0004] The purpose of this utility model is to provide a prefabricated assembled caisson that improves the structural stability and sealing of the assembled caisson.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] A prefabricated caisson includes an annular base, on the upper side of which multiple annular walls are assembled. The annular walls are annular structures, and each layer of the annular wall is composed of multiple arc-shaped segments spliced ​​together. The segments of the upper and lower annular walls are staggered.

[0007] The tube segment is embedded and fixed with a first positioning post. The first positioning post has an extension on both the upper and lower sides of the tube segment. A semi-circular groove is opened on the end side of the tube segment. The semi-circular grooves of adjacent tube segments are spliced ​​together to form a first positioning groove for the insertion of the first positioning post.

[0008] Furthermore, the lower side of the base has an inner cutting edge structure, and a stepped portion is provided above the inner cutting edge. The upper edge of the base is provided with a second positioning post and a second positioning groove at intervals, and the bottom of the second positioning groove has an overflow hole corresponding to the inner sidewall of the base.

[0009] Furthermore, grouting grooves are provided on the upper side of the segment and the upper side of the base, the grouting grooves having an isosceles trapezoidal cross section, and the lower side of the segment having a convex ridge having an isosceles trapezoidal cross section.

[0010] This invention offers the following advantages: Compared to traditional on-site casting methods using templates, this well body segment construction utilizes factory prefabrication, avoiding environmental influences and offering faster construction with a lower error rate. Each segment has a connecting end, a first positioning post, which is inserted into the first positioning groove between adjacent segments in the lower layer. The insertion depth of the first positioning post reaches the middle of the first positioning groove, which accommodates both the lower and upper first positioning posts. During construction, cement mortar is first injected into the corresponding first positioning groove. The first positioning groove is formed by splicing semi-circular grooves from the end of the segment, resulting in gaps on both the inner and outer sides. To prevent cement mortar overflow during injection, templates can be embedded in the gaps to block it. Then, the upper segment is installed, and the corresponding first positioning post is inserted into the first positioning groove. The cement mortar fills the gaps, improving sealing. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0012] Figure 1 : Schematic diagram of the structure of this utility model.

[0013] Figure 2 : Schematic diagram of the base separation structure of this utility model.

[0014] Figure 3 : A schematic diagram of the cross-sectional structure of the base of this utility model.

[0015] Figure 4 : Schematic diagram of the installation structure of a single segment of this utility model.

[0016] The components represented by each number in the attached diagram are listed below: base 1, tube segment 2, first positioning post 3, semi-circular groove 21, step portion 14, second positioning post 11, second positioning groove 12, overflow hole 13, grouting groove 22, and protruding ridge 23. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] like Figures 1-4 As shown: A prefabricated caisson includes a ring-shaped base 1. Multiple ring walls are assembled on the upper side of the base 1. The ring walls have a ring structure, and each layer is composed of multiple arc-shaped segments 2. The segments 2 of the upper and lower ring walls are staggered. Each layer has approximately 10 segments. The ends of the lower segments are aligned with the middle of the upper segments. During construction, the bottom layer of the base is poured first using a template, forming a ring-shaped integral structure located at the ground surface. After the base is formed, excavation is carried out on the inner side of the base, allowing it to automatically settle until the upper edge is level with the ground surface. Then, the segments are assembled, with each layer constructed individually. Cement mortar is poured on the contact sides between the lower sides of the segments and the upper sides of the base to ensure a strong seal later.

[0019] The tube segment 2 is embedded with a first positioning post 3. The first positioning post 3 has an extension on both the upper and lower sides of the tube segment 2. A semi-circular groove 21 is opened on the end side of the tube segment 2. The semi-circular grooves 21 of adjacent tube segments 2 are spliced ​​together to form a first positioning groove for the first positioning post 3 to be inserted.

[0020] The well body is circular and is constructed using segmented pipe assembly. Cement mortar is poured on the contact sides of the segments for bonding. Construction is carried out layer by layer. After the cement of the single-layer annular wall has solidified, settlement construction is carried out to make the upper edge of the annular wall level with the ground before continuing to assemble the upper layer of segments until completion.

[0021] Compared to traditional on-site casting methods using templates, this well segment construction utilizes factory prefabrication, avoiding environmental influences and offering faster construction with a lower error rate. Both upper and lower segments have connecting ends, each consisting of a first positioning post. These posts are inserted into the first positioning grooves between adjacent lower segments, reaching the middle of the groove. The first positioning grooves accommodate both the lower and upper segments. During construction, cement mortar is first injected into the corresponding first positioning grooves. These grooves are formed by splicing semi-circular grooves from the segments' ends, creating gaps on both the inner and outer sides. To prevent mortar overflow during injection, templates can be embedded in these gaps. Then, the upper segments are installed, and the corresponding first positioning posts are inserted into the grooves. The cement mortar fills these gaps, improving sealing.

[0022] The first positioning post not only improves the sealing of the connection between adjacent segments, but also, being an integral structure with the segment, makes the connection between upper and lower segments more robust and provides better support. The outer wall of the first positioning post is made of steel pipe, and the interior is filled with concrete mortar, so its strength is sufficient.

[0023] like Figure 3 As shown: The base 1 has an inner cutting edge structure on its lower side, and a stepped portion 14 is provided above the inner cutting edge. The inner cutting edge structure facilitates soil settlement during cutting, and the stepped portion is used for the subsequent installation of the precast base slab. The circular base slab is supported on the stepped portion, and the connecting side is poured with cement mortar to ensure connection stability and sealing. Figure 2 As shown: A second positioning post 11 and a second positioning groove 12 are provided at intervals along the upper side of the base 1. An overflow hole 13 is opened at the bottom of the second positioning groove 12 corresponding to the inner side wall of the base 1. The second positioning post is an integral structure with the base. Both the second positioning post and the second positioning groove are used for the installation of the first layer annular wall. The overflow hole is used to overflow excess cement mortar after the first positioning post of the upper layer is inserted.

[0024] As shown in Figure 4, grouting grooves 22 are provided on the upper side of the segment 2 and the upper side of the base 1. The grouting grooves 22 have an isosceles trapezoidal cross section. The lower side of the segment 2 has a protruding rib 23, which also has an isosceles trapezoidal cross section. After the segments on the upper and lower sides are spliced, the protruding ribs are confined in the grouting grooves, while leaving a certain gap for filling with cement mortar. During construction, the fluid cement mortar is spread evenly in the grouting grooves, and then the upper segment is stacked. The protruding ribs of the segments squeeze the mortar until it overflows from the grouting grooves, ensuring that the mortar fully fills the grouting grooves. The multiple bending structures formed between the protruding ribs and the grouting grooves help to increase the contact area of ​​the cement mortar, improve the bonding strength, and improve the sealing performance.

[0025] These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of this utility model, so that those skilled in the art can better understand and utilize this utility model.

Claims

1. A prefabricated assembled caisson, characterized in that: It includes a ring-shaped base (1), and a multi-layer ring wall is assembled on the upper side of the base (1). The ring wall is a ring structure, and a single ring wall is made up of multiple arc-shaped tube segments (2) spliced ​​together. The tube segments (2) corresponding to the upper and lower ring walls are staggered. The tube segment (2) is embedded with a first positioning post (3). The first positioning post (3) has an extension on both the upper and lower sides of the tube segment (2). A semi-circular groove (21) is opened on the end side of the tube segment (2). The semi-circular grooves (21) of adjacent tube segments (2) are spliced ​​together to form a first positioning groove for the first positioning post (3) to be inserted.

2. The prefabricated caisson according to claim 1, characterized in that: The base (1) has an inner cutting edge structure on its lower side, and a step (14) is provided above the inner cutting edge.

3. The prefabricated caisson according to claim 2, characterized in that: The base (1) is provided with a second positioning post (11) and a second positioning groove (12) at intervals along the side. The bottom of the second positioning groove (12) is provided with an overflow hole (13) corresponding to the inner side wall of the base (1).

4. The prefabricated caisson according to claim 1, characterized in that: Grouting grooves (22) are provided on the upper side of the tube segment (2) and the upper side of the base (1). The grouting grooves (22) have an isosceles trapezoidal cross section. The lower side of the tube segment (2) is a convex ridge (23), which also has an isosceles trapezoidal cross section.

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