Configuration of a vertical connection joint of an underground composite structural wall

Abstract

The utility model discloses a kind of configurations of underground combined structure wall vertical connection joint, configuration includes several groups to sequentially connect steel box from top to bottom;Any two upper and lower adjacent steel box are defined as upper section steel box, lower section steel box respectively;The lower edge of the steel plate of upper section steel box is connected with I-shaped connecting piece;The upper edge of the steel plate of lower section steel box is connected with U-shaped connecting piece;Wherein U-shaped connecting piece is filled with grouting material;Local extension steel plate is equipped in the U-shaped connecting piece of lower section steel box corner, and local extension steel plate is provided with first positioning hole;I-shaped connecting piece of upper section steel box corner is equipped with the local transverse steel plate corresponding with local extension steel plate, and second positioning hole corresponding with the position of first positioning hole is opened on local transverse steel plate;The utility model is connected by specific vertical connection joint to carry out steel box combination ground connection wall vertical connection, improve the reliability of steel box combination ground connection wall vertical connection and reduce field welding workload, improve construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of underground engineering structure technology, specifically to a configuration of a vertical connection joint for underground composite structural walls, applicable to the vertical connection 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. Utility Model Content

[0003] The purpose of this utility model is to provide a configuration of a vertical connection joint for underground composite structure walls. 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 utility model is achieved through the following technical solution: the configuration of the vertical connection joint of the underground composite structure 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, the upper and lower ends of the steel boxes are open, and the thickness of the steel plate of the steel box is t; any two adjacent 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 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 12, 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; the I-shaped connector 2 has staggered grooves on both sides, and the grooves are arranged along the entire length of the I-shaped connector.

[0007] At the corner of the lower section steel box 4, the U-shaped connector 1 is provided with a partially extended steel plate 13, and the partially extended steel plate 13 has a first positioning hole 14; at the corner of the upper section steel box 3, the I-shaped connector 2 is provided with a partially transverse steel plate 21 corresponding to the partially extended steel plate 13, and a second positioning hole 22 corresponding to the position of the first positioning hole 14 is provided on the partially transverse steel plate 21.

[0008] The grouting material 5 is a high-strength cement-based grouting mixture or ultra-high performance concrete.

[0009] The beneficial effects of this utility model are as follows:

[0010] This utility model proposes a configuration for a vertical connection joint of an underground composite structural wall, which utilizes a specific configuration of vertical joint and grouting material for connection. Its advantages are as follows:

[0011] 1. The nested butt joint structure of U-shaped and I-shaped connection joints allows the load to be evenly transferred through the entire joint cross section, effectively eliminating the stress concentration phenomenon of traditional welded joints and greatly improving the reliability of steel box combined diaphragm wall joints.

[0012] 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;

[0013] 3. By setting flanges on the inner wall of U-shaped connectors and grooves on I-shaped connectors, the interlocking effect of vertical connectors is increased, significantly increasing the contact area of ​​the connectors, making the load transfer more uniform and stable, and further improving the overall load-bearing capacity and pull-out resistance of the connectors;

[0014] 4. Using grouting material to achieve joint connection reduces the amount of on-site welding work, greatly simplifies the construction process and shortens the construction period. Attached Figure Description

[0015] Figure 1 This is a top view of the steel box body;

[0016] Figure 2 for Figure 1 Sectional view at point AA;

[0017] Figure 3 for Figure 1 Sectional view at point BB;

[0018] Figure 4 for Figure 2 A magnified view of a section at point 1;

[0019] Figure 5 This is a sectional view of the I-shaped connector;

[0020] Figure 6 This is a sectional view of the U-shaped connector.

[0021] Labeling explanation: 1-U-shaped connector, 12-flange structure, 13-partially extended steel plate, 14-first positioning opening, 2-I-shaped connector, 21-partially transverse steel plate, 22-second positioning opening, 23-positioning bolt, 24-steel washer, 3-upper steel box, 4-lower steel box, 5-grouting material. Detailed Implementation

[0022] like Figure 1-6 As shown: A configuration of a vertical connection joint 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.

[0023] 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;

[0024] 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 12, 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. The I-shaped connector 2 is provided with staggered grooves on both sides, and the grooves are set along the entire length of the I-shaped connector.

[0025] At the corner of the lower section steel box 4, the U-shaped connector 1 is provided with a partially extended steel plate 13, and the partially extended steel plate 13 has a first positioning hole 14; at the corner of the upper section steel box 3, the I-shaped connector 2 is provided with a partially transverse steel plate 21 corresponding to the partially extended steel plate 13, and a second positioning hole 22 corresponding to the position of the first positioning hole 14 is provided on the partially transverse steel plate 21.

[0026] The grouting material 5 is a high-strength cement-based grouting mixture or ultra-high performance concrete.

[0027] The core of this invention lies in the fact that during the downward movement of the I-shaped connector 2, a mating structure similar to male and female grooves is formed, which is then used in conjunction with grouting material to achieve vertical connection of the steel box. The flange structure and grooves mainly allow the grouting material to better engage with the U-shaped connector 1.

[0028] It should be noted that the U-shaped connector 1 includes a vertical steel plate 11, a sloping steel plate, and a connecting steel plate. The sloping steel plate is connected to the bottom of the vertical steel plate 11. Two mirror-symmetrical vertical steel plates 11 and sloping steel plates are connected at the bottom of the sloping steel plate to form a U-shaped component with a U-shaped cross-section. The bottom of the U-shaped component is connected to the connecting steel plate to form the U-shaped connector 1. The flange structure 12 is provided on the inner side wall of the vertical steel plate 11.

[0029] Furthermore, the first positioning hole 14 of the U-shaped connector 1 and the second positioning hole 22 of the I-shaped connector 2 are centered and connected by positioning bolts 23, and the upper steel box 3 is leveled by steel shims 24. This is used to adjust the verticality of the steel box body.

[0030] In addition, appropriate limits were also made on the dimensions of each structure. For example, the length of the local extension steel plate 15 is t+50mm and the thickness is 0.5t; the length of the local transverse steel plate 23 is t+50mm and the thickness is 0.5t. In addition, the height of the flange structure 14 is not less than 0.2t and the width is not less than 0.2t.

[0031] After the I-shaped connector 2 is fully inserted into the U-shaped connector 1, the part of the I-shaped connector 21 that is not submerged in the U-shaped connector 1 has a length of not less than 3t. The grooves on both sides of the I-shaped connector 2 are staggered by 0.5t, with a groove depth of 0.2mm and a groove width of 0.2mm.

[0032] This utility model discloses a construction method for a vertical connection joint configuration of an underground composite structural wall, comprising the following steps:

[0033] Step 1: Prepare the upper section steel box 3, and weld the I-shaped connector 2 to the lower end of the steel plate of the upper section steel box; prepare the lower section steel box 4, and weld the U-shaped connector 1 to the upper end of the steel plate of the lower section steel box 4.

[0034] Step 2: Lower the lower section of the integral steel box until its top is 0.5m-1m above the ground;

[0035] Step 3: Fill the U-shaped connector 1 with grout 5, and use vibration or tapping to ensure that the grout is compacted;

[0036] Step 4: Before the grout has initially set, lift the upper section of the integral steel box with the I-shaped connector 2, align the I-shaped connector 2 with the opening of the U-shaped connector 1 and insert it;

[0037] Step 5: After the I-shaped connector 2 is inserted into the U-shaped connector 1 to a certain depth and before the grouting material has set, the positioning hole 16 of the U-shaped connector 1 and the positioning hole 24 of the I-shaped connector 2 are aligned and connected by positioning bolts 25 and leveled by steel shims 26.

[0038] Step 6: Grout material 5 reaches final setting, process complete.

[0039] 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.

[0040] 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.

[0041] 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 of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A configuration of a vertical connection joint 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 U-shaped connector (1) has a flange structure (12) on its inner wall, 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); the I-shaped connector (2) has staggered grooves on both sides, and the grooves are arranged along the entire length of the I-shaped connector; A U-shaped connector (1) at the corner of the lower steel box (4) is provided with a partial extended steel plate (13), and a first positioning opening (14) is opened on the partial extended steel plate (13); an I-shaped connector (2) at the corner of the upper steel box (3) is provided with a partial transverse steel plate (21) corresponding to the partial extended steel plate (13), and a second positioning opening (22) corresponding to the position of the first positioning opening (14) is opened on the partial transverse steel plate (21); The grouting material (5) is a high-strength cement-based grouting mixture or ultra-high performance concrete.

2. The configuration of the vertical connection joint of the underground composite structural wall according to claim 1, characterized in that, The first positioning opening (14) of the U-shaped connector (1) and the second positioning opening (22) of the I-shaped connector (2) are connected in the center by positioning bolts (23) and the upper steel box (3) is leveled by steel shims (24).

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