Configuration and construction method of vertical connecting joint of underground composite structure wall

Abstract

The application is a kind of vertical connection joint configuration and construction method of underground combined structure wall, which comprises a plurality of steel boxes; the lower edge of the steel plate of any two adjacent upper steel boxes is connected with an I-shaped connecting piece, and the I-shaped connecting piece is provided with a rotating steel member; the upper edge of the steel plate of the lower steel box is connected with a U-shaped connecting piece, and the U-shaped connecting piece is filled with grouting material. The construction method is to prepare the upper and lower steel boxes, weld the I-shaped connecting piece at the lower end of the steel plate of the upper steel box, and weld the U-shaped connecting piece at the upper end of the steel plate of the lower steel box; fill the U-shaped connecting piece with grouting material; lift the upper integral steel box, insert the I-shaped connecting piece into the opening of the U-shaped connecting piece, and the I-shaped connecting piece touches the bottom of the U-shaped connecting piece; the rotating steel member is opened, and the process is completed after the final setting of the grouting material. The application improves the reliability of the vertical connection of the steel box combined underground continuous wall and reduces the welding workload on site, thereby improving the construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of underground engineering structure technology, specifically to a configuration and construction method of a vertical connection joint for underground composite structural walls, applicable to the vertical connection construction of steel box composite diaphragm walls in underground engineering. Background Technology

[0002] With the development of underground engineering technology, diaphragm walls, mainly composed of steel structures, are gradually being promoted and applied in engineering projects due to their advantages such as light weight, high rigidity, and controllable quality. CN111827264A discloses a method for constructing diaphragm walls using steel caisson technology. A single diaphragm wall is composed of multiple steel caisson components arranged and connected, sinking section by section, with adjacent steel caisson components connected by welding. However, this type of vertical connection of steel caissons has the following problems: 1. It is prone to stress concentration, which may lead to joint deformation or breakage under complex geological loads, increasing the risk of joint failure; 2. It leaves no room for vertical alignment or horizontal correction when connecting upper and lower steel caisson sections, directly resulting in the inability to adjust deviations in real time during the section-by-section sinking process, leading to tilting, offset, and other problems; 3. It involves a large amount of welding on-site, requiring rust removal, grinding, and beveling of the welded areas beforehand, making the process cumbersome and the construction period long. Summary of the Invention

[0003] The purpose of this invention is to provide a configuration and construction method for a vertical connection joint of an underground composite structure wall. It uses a specific vertical connection joint to vertically connect steel box composite diaphragm walls, thereby improving the reliability of the vertical connection of steel box composite diaphragm walls, reducing on-site welding workload, and improving construction efficiency.

[0004] This invention is achieved through the following technical solution: a vertical connection joint configuration for an underground composite structural wall, the main body comprising several groups of steel boxes connected sequentially from top to bottom, the steel boxes being formed by assembling and welding steel plates, both the upper and lower ends of the steel boxes being open, and the thickness of the steel plates of the steel boxes being t; any two adjacent upper and lower sections of the steel boxes are defined as the upper steel box 3 and the lower steel box 4, respectively.

[0005] The lower edge of the steel plate of the upper steel box 3 is connected with an I-shaped connector 2 to form an integral upper steel box; the upper edge of the steel plate of the lower steel box 4 is connected with a U-shaped connector 1 to form an integral lower steel box; the U-shaped connector 1 is filled with grout 5, so that the I-shaped connector 2 of the integral upper steel box is inserted into the U-shaped connector 1 of the integral lower steel box, and the grout 5 solidifies to achieve the vertical connection between the upper steel box 3 and the lower steel box 4;

[0006] The net width of the opening of the U-shaped connector 1 is not less than 3t, and the vertical height is not less than 12t; the inner wall of the U-shaped connector 1 is provided with a flange structure 11, and the number of flanges on any side wall is not less than 3 sets, and the flanges are arranged along the entire length of the U-shaped connector 1.

[0007] The lower part of the I-shaped connector 2 is inserted into the U-shaped connector 1. The lower part of the I-shaped connector 2 is provided with multiple sets of horn-shaped openings spaced horizontally. Each horn-shaped opening includes multiple horn-shaped openings 22 spaced vertically. The horn openings of any two adjacent horn-shaped openings face opposite directions. A lifting rod 21 is provided on the smaller opening side of the horn-shaped opening 22 in the horn-shaped opening group. A limiting opening 25 corresponding to the horn-shaped opening 22 is provided on the lifting rod 21. A rotating steel component 23 is inserted into the limiting opening 25. The head of the rotating steel component 23 extends outward from the larger opening of the horn-shaped opening 22. The bottom end of the lifting rod 21 extends slightly beyond the bottom end of the I-shaped connector 2.

[0008] The head end of the rotating steel component 23 is initially attached to the side wall of the I-shaped connector 2. When the lower part of the I-shaped connector 2 is inserted into the U-shaped connector 1 so that the lifting rod 21 contacts the bottom of the groove of the U-shaped connector 1, the lifting rod 21 lifts and rotates the rotating steel component 23 to form a barbed structure.

[0009] At the corner of the lower section steel box 4, the U-shaped connector 1 is provided with a partially extended steel plate 12, and the partially extended steel plate 12 has a first positioning hole 13; at the corner of the upper section steel box 3, the I-shaped connector 2 is provided with a partially transverse steel plate 26 corresponding to the partially extended steel plate 12, and a second positioning hole 27 corresponding to the position of the first positioning hole 13 is provided on the partially transverse steel plate 26.

[0010] The grouting material 5 is a high-strength cement-based grouting mixture or ultra-high performance concrete.

[0011] A construction method for a vertical connection joint configuration of an underground composite structural wall includes the following steps:

[0012] Includes the following steps:

[0013] Step 1: Prepare the I-shaped connector 2, place the lifting rod 21 on the side of the I-shaped connector 2, insert the rotating steel component 23 into the limiting hole 25 and insert the pin 24 into the tail of the rotating steel component 23; prepare the upper steel box 3, weld the prepared I-shaped connector 2 to the lower end of the upper steel box plate; prepare the lower steel box 4, weld the U-shaped connector 1 to the upper end of the lower steel box 4 plate;

[0014] Step 2: Lower the lower section of the integral steel box until its top is 0.5-1.0m above the ground;

[0015] Step 3: Fill the U-shaped connector 1 with grout 5, and use vibration or tapping to ensure that the grout is compacted;

[0016] Step 4: Before the grout initially sets, lift the upper section of the integral steel box with the I-shaped connector 2 and slowly insert it into the U-shaped connector 1;

[0017] Step 5: After the I-shaped connector 2 is inserted into the U-shaped connector 1 to a certain depth, the bottom of the lifting rod 21 of the I-shaped connector 2 touches the bottom of the groove of the U-shaped connector 1, and the tail of the rotating steel component 23 moves with the lifting rod 21 and rotates open to form a barbed structure.

[0018] Step 6: Before the grouting material has set, the first positioning hole 13 of the U-shaped connector 1 and the second positioning hole 27 of the I-shaped connector 2 are connected by positioning bolts 28 and the upper steel box is leveled with the help of steel shims 29.

[0019] Step 7: Grout material 5 reaches final setting, process completed.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The connection type based on the self-locking mechanism effectively eliminates stress concentration and significantly improves the reliability of the steel box combined floor diaphragm joint;

[0022] 2. By using U-shaped and I-shaped connectors in a coordinated manner, an adjustment space with both verticality calibration and horizontal correction functions is created at the vertical connector, providing a margin for deviation adjustment and effectively solving the problem of difficulty in controlling accuracy in traditional connection methods;

[0023] 3. Joints are connected by grouting material, reducing on-site welding work, greatly simplifying construction procedures and shortening the construction period. Attached Figure Description

[0024] Figure 1 This is a top view of the steel box body;

[0025] Figure 2 for Figure 1 Sectional view at point AA;

[0026] Figure 3 for Figure 1 Sectional view at point BB;

[0027] Figure 4 for Figure 2 A magnified view of a section at point 1;

[0028] Figure 5 This is a sectional view of the I-shaped connector;

[0029] Figure 6 This is a sectional view of the U-shaped connector.

[0030] Labeling Explanation: 1-U-shaped connector, 11-Flange structure, 12-Partially extended steel plate, 13-First positioning opening, 2-I-shaped connector, 21-Lifting rod, 22-Flare opening, 23-Rotating steel component, 24-Pin, 25-Limiting opening, 26-Steel gasket, 27-Second positioning opening, 28-Positioning bolt, 29-Steel gasket, 3-Upper steel box, 4-Lower steel box, 5-Grouting material. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings:

[0032] like Figure 1-6 As shown: A vertical connection joint configuration for an underground composite structural wall, the main body includes several groups of steel boxes connected sequentially from top to bottom. The steel boxes are formed by assembling and welding steel plates. Both the upper and lower ends of the steel boxes are open. The thickness of the steel plates of the steel boxes is t. Any two adjacent steel boxes are defined as the upper steel box 3 and the lower steel box 4, respectively. In engineering, the commonly used thickness of t is 8mm-20mm.

[0033] The lower edge of the steel plate of the upper steel box 3 is connected with an I-shaped connector 2 to form an integral upper steel box; the upper edge of the steel plate of the lower steel box 4 is connected with a U-shaped connector 1 to form an integral lower steel box; the U-shaped connector 1 is filled with grout 5, so that the I-shaped connector 2 of the integral upper steel box is inserted into the U-shaped connector 1 of the integral lower steel box, and the grout 5 solidifies to achieve the vertical connection between the upper steel box 3 and the lower steel box 4;

[0034] The net width of the opening of the U-shaped connector 1 should be determined according to the verticality control requirements of the steel box connection construction and the length of the lower steel box, and should not be less than 3t. The vertical height should meet the anchorage length requirements of the I-shaped connector 2 and should not be less than 12t. The inner wall of the U-shaped connector 1 is provided with a flange structure 11, and the number of flanges on any side wall is not less than 3 sets. The flanges are set along the entire length of the U-shaped connector 1.

[0035] The lower part of the I-shaped connector 2 is inserted into the U-shaped connector 1. The lower part of the I-shaped connector 2 is provided with multiple sets of horn-shaped openings spaced horizontally. Each horn-shaped opening includes multiple horn-shaped openings 22 spaced vertically. The horn openings of any two adjacent horn-shaped openings face opposite directions. A lifting rod 21 is provided on the smaller opening side of the horn-shaped opening 22 in the horn-shaped opening group. A limiting opening 25 corresponding to the horn-shaped opening 22 is provided on the lifting rod 21. A rotating steel component 23 is inserted into the limiting opening 25. The head of the rotating steel component 23 extends outward from the larger opening of the horn-shaped opening 22. The bottom end of the lifting rod 21 extends slightly beyond the bottom end of the I-shaped connector 2.

[0036] The head end of the rotating steel component 23 is initially attached to the side wall of the I-shaped connector 2. When the lower part of the I-shaped connector 2 is inserted into the U-shaped connector 1 so that the lifting rod 21 contacts the bottom of the groove of the U-shaped connector 1, the lifting rod 21 lifts and rotates the rotating steel component 23 to form a barbed structure.

[0037] At the corner of the lower section steel box 4, the U-shaped connector 1 is provided with a partially extended steel plate 12, and the partially extended steel plate 12 has a first positioning hole 13; at the corner of the upper section steel box 3, the I-shaped connector 2 is provided with a partially transverse steel plate 26 corresponding to the partially extended steel plate 12, and a second positioning hole 27 corresponding to the position of the first positioning hole 13 is provided on the partially transverse steel plate 26.

[0038] The grouting material 5 is a high-strength cement-based grouting mixture or ultra-high performance concrete.

[0039] The core of this invention lies in the fact that during the downward movement of the I-shaped connector 2, the I-shaped connector 2 will trigger the lifting rod, which will further cause the rotating steel component 23 to rotate and open to form a hook structure; subsequently, with the help of grouting material, the steel box is vertically connected.

[0040] The flange structure allows the grout to better fit with the U-shaped connector 1.

[0041] The tail of the rotating steel component 23 is provided with a pin 24 that cooperates with the limiting hole 25, so that the head of the rotating steel component 23 can swing up and down and form an anti-fall-off structure.

[0042] This mainly guides the rotation of the rotating steel component 23 and prevents it from falling off.

[0043] The first positioning opening 13 of the U-shaped connector 1 and the second positioning opening 27 of the I-shaped connector 2 are connected by positioning bolts 28 and leveled by steel shims 29. This is used to adjust the verticality of the steel box.

[0044] The I-shaped connector 2 is provided with a limiting groove for accommodating the lifting rod 21, so that the outer side of the lifting rod 21 is flush with the side of the I-shaped connector 2.

[0045] The localized outer steel plate 12 has a length of t+50mm and a thickness of 0.5t; the localized transverse steel plate 23 has a length of t+50mm and a thickness of 0.5t.

[0046] In addition, the height of the flange structure 11 is not less than 0.2t, and the width is not less than 0.2t.

[0047] The thickness of the I-shaped connector 2 is t+2mm; after the I-shaped connector 2 is fully inserted into the U-shaped connector 1, the length of the part of the I-shaped connector 2 that is not submerged in the U-shaped connector 1 is not less than 3t.

[0048] The distance between any two adjacent horn-shaped openings is 500±20mm; the thickness of the rotating steel component 23 of the horn-shaped opening group is 0.5t, and the width is also 0.5t; the height and width of the limiting opening 25 are adapted to the rotating steel component 23.

[0049] A construction method for a vertical connection joint configuration of an underground composite structural wall includes the following steps:

[0050] Step 1: Prepare the I-shaped connector 2, place the lifting rod 21 on the side of the I-shaped connector 2, insert the rotating steel component 23 into the limiting hole 25 and insert the pin 24 into the tail of the rotating steel component 23; prepare the upper steel box 3, weld the prepared I-shaped connector 2 to the lower end of the upper steel box plate; prepare the lower steel box 4, weld the U-shaped connector 1 to the upper end of the lower steel box 4 plate;

[0051] Step 2: Lower the lower section of the integral steel box until its top is 0.5-1.0m above the ground;

[0052] Step 3: Fill the U-shaped connector 1 with grout 5, and use vibration or tapping to ensure that the grout is compacted;

[0053] Step 4: Before the grout initially sets, lift the upper section of the integral steel box with the I-shaped connector 2 and slowly insert it into the U-shaped connector 1;

[0054] Step 5: After the I-shaped connector 2 is inserted into the U-shaped connector 1 to a certain depth, the bottom of the lifting rod 21 of the I-shaped connector 2 touches the bottom of the groove of the U-shaped connector 1, and the tail of the rotating steel component 23 moves with the lifting rod 21 and rotates open to form a barbed structure.

[0055] Step 6: Before the grouting material has set, the first positioning hole 13 of the U-shaped connector 1 and the second positioning hole 27 of the I-shaped connector 2 are connected by positioning bolts 28 and the upper steel box is leveled with the help of steel shims 29.

[0056] Step 7: Grout material 5 reaches final setting, process completed.

[0057] In step 3, the filling height of grout 5 shall not be less than 4 / 5 of the depth of U-shaped connector 1, the 28-day compressive strength shall not be less than 30MPa, the initial setting time shall not be less than 1 hour, and the final setting time shall not be greater than 12 hours.

[0058] In step 4, the insertion speed of the I-shaped connector 2 into the U-shaped connector 1 shall not exceed 10 mm / s, and the vertical deviation shall not exceed 1 / 1000.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention 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 of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vertical connection joint configuration for an underground composite structural wall, the main body comprising several groups of steel boxes connected sequentially from top to bottom, the steel boxes being formed by assembling and welding steel plates, the upper and lower ends of the steel boxes being open, and the thickness of the steel plates of the steel boxes being t; any two adjacent upper and lower sections of the steel boxes are defined as the upper steel box (3) and the lower steel box (4), respectively. Its features are: The lower edge of the steel plate of the upper steel box (3) is connected with an I-shaped connector (2) to form an integral upper steel box; the upper edge of the steel plate of the lower steel box (4) is connected with a U-shaped connector (1) to form an integral lower steel box; the U-shaped connector (1) is filled with grout (5) so that the I-shaped connector (2) of the integral upper steel box is inserted into the U-shaped connector (1) of the integral lower steel box, and the grout (5) solidifies to achieve the vertical connection between the upper steel box (3) and the lower steel box (4); The U-shaped connector (1) has a net opening width of not less than 3t and a vertical height of not less than 12t; the inner wall of the U-shaped connector (1) is provided with a flange structure (11), and the number of flanges on any side wall is not less than 3 sets, and the flanges are provided along the entire length of the U-shaped connector (1); The lower part of the I-shaped connector (2) is inserted into the U-shaped connector (1). The lower part of the I-shaped connector (2) is provided with multiple sets of horn-shaped openings at intervals along the horizontal direction. The horn-shaped openings include multiple horn-shaped openings (22) at intervals in the vertical direction. The horn openings of any two adjacent horn-shaped openings face opposite directions. A lifting rod (21) is provided on the smaller side of the horn-shaped opening (22) in the horn-shaped opening group. A limiting opening (25) corresponding to the horn-shaped opening (22) is provided on the lifting rod (21). A rotating steel component (23) is inserted into the limiting opening (25). The head of the rotating steel component (23) extends outward from the larger opening of the horn-shaped opening (22). The bottom end of the lifting rod (21) extends slightly outward from the bottom end of the I-shaped connector (2). The head end of the rotating steel component (23) is in contact with the side wall of the I-shaped connector (2) in the initial state. When the lower part of the I-shaped connector (2) is inserted into the U-shaped connector (1) so that the lifting rod (21) contacts the bottom of the groove of the U-shaped connector (1), the lifting rod (21) lifts and rotates the rotating steel component (23) to form a hook structure. A partial extension steel plate (12) is provided on the U-shaped connector (1) at the corner of the lower steel box (4), and a first positioning hole (13) is opened on the partial extension steel plate (12); an I-shaped connector (2) at the corner of the upper steel box (3) is provided with a partial transverse steel plate (26) corresponding to the partial extension steel plate (12), and a second positioning hole (27) corresponding to the position of the first positioning hole (13) is opened on the partial transverse steel plate (26); The grouting material (5) is a high-strength cement-based grouting mixture or ultra-high performance concrete.

2. The vertical connection joint configuration of an underground composite structural wall according to claim 1, characterized in that, The tail of the rotating steel component (23) is provided with a pin (24) that cooperates with the limiting hole (25), so that the head of the rotating steel component (23) can swing up and down and form an anti-fall-off structure.

3. The vertical connection joint configuration of an underground composite structural wall according to claim 1, characterized in that, The first positioning opening (13) of the U-shaped connector (1) and the second positioning opening (27) of the I-shaped connector (2) are centered and connected by positioning bolts (28) and leveled by steel washers (29).

4. The construction method for a vertical connection joint configuration of an underground composite structural wall according to claim 1, characterized in that, The I-shaped connector (2) is provided with a limiting groove for accommodating the lifting rod (21), so that the outer side of the lifting rod (21) is flush with the side of the I-shaped connector (2).

5. A construction method for a vertical connection joint configuration of an underground composite structural wall, characterized in that, Includes the following steps: Step 1: Prepare the I-shaped connector (2), place the lifting rod (21) on the side of the I-shaped connector (2), insert the rotating steel component (23) into the limiting hole (25) and insert the pin (24) at the tail of the rotating steel component (23); prepare the upper steel box (3), weld the prepared I-shaped connector (2) to the lower end of the upper steel box plate; prepare the lower steel box (4), weld the U-shaped connector (1) to the upper end of the lower steel box (4) plate; Step 2: Lower the lower section of the integral steel box until its top is 0.5-1.0m above the ground; Step 3: Fill the U-shaped connector (1) with grout (5) and use vibration or tapping to ensure the grout is compacted; Step 4: Before the grout has initially set, lift the upper section of the integral steel box with the I-shaped connector (2) and slowly insert it into the U-shaped connector (1); Step 5: After the I-shaped connector (2) is inserted into the U-shaped connector (1) to a certain depth, the bottom of the lifting rod (21) of the I-shaped connector (2) touches the bottom of the groove of the U-shaped connector (1), and the tail of the rotating steel component (23) moves and rotates with the lifting rod (21) to form a barbed structure; Step 6: Before the grouting material has set, the first positioning hole (13) of the U-shaped connector (1) and the second positioning hole (27) of the I-shaped connector (2) are connected in the center by positioning bolts (28) and the upper steel box is leveled by steel shims (29). Step 7: Grouting material (5) finally sets, and the process is completed.

6. The construction method of the configuration according to claim 5, characterized in that: In step 3, the filling height of the grout (5) shall not be less than 4 / 5 of the depth of the U-shaped connector (1), the compressive strength after 28 days shall not be less than 30MPa, the initial setting time shall not be less than 1 hour, and the final setting time shall not be greater than 12 hours.

7. The construction method of the configuration according to claim 5, characterized in that: In step 4, the insertion speed of the I-shaped connector (2) into the U-shaped connector (1) should not exceed 10 mm / s, and the vertical deviation should not exceed 1 / 1000.

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