I-shaped steel row connecting plug and steel bar assembly for I-shaped underground diaphragm wall

Abstract

The utility model relates to an I-shaped steel row inserting connector and a steel bar assembly for an I-shaped underground diaphragm wall. The I-shaped steel row inserting connector is provided with I-shaped steel, each wing plate of the I-shaped steel is provided with reinforcing meshes extending out of the two transverse sides, the reinforcing meshes are rectangular, the longitudinal size of the reinforcing meshes is smaller than that of the I-shaped steel, and the reinforcing meshes are located in the longitudinal middle of the I-shaped steel and arranged on the two wing plates of the I-shaped steel. The slurry stopping sheet at least extends out from one side of the wing plate; the reinforcing steel bar assembly comprises an extension socket connector and a T-shaped reinforcing steel bar cage, the I-shaped steel extension socket connector is adopted as the extension socket connector, and the T-shaped reinforcing steel bar cage comprises a main reinforcing steel bar cage body arranged in a main wall body on the corresponding side of the I-shaped underground diaphragm wall and an extension socket reinforcing steel bar cage body arranged in a middle partition wall of the I-shaped underground diaphragm wall. The extension socket reinforcement cage is provided with an insertion part used for being inserted into the extension socket connector. The construction operation such as grooving and pouring of the I-shaped underground diaphragm wall is facilitated, the construction efficiency is improved, and the engineering quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the row plug connector and reinforcing bar assembly suitable for I -shaped underground continuous wall. BACKGROUND

[0002] The existing underground continuous wall (e.g., a scour protection wall) is mostly a one-dimensional structure or an L-shaped structure, and there is no intersection of multiple wall bodies in the wall body. The connection between adjacent steel cages can meet the strength requirements of the wall body by using connection pipes, cross steel plate joints, I-shaped steel joints, and reinforced concrete prefabricated joints. For example, Chinese patent document CN115821901A discloses a construction method of a high-strength underground continuous wall body, which includes placing a first steel cage in a predetermined area of a construction site; installing a joint box to the end of the first steel cage; the joint box has an isolation chamber, and the end of the first steel cage extends into the isolation chamber; a pouring space is formed between the middle space of the first steel cage and the joint box; fluid-state concrete is injected into the pouring space; after the concrete solidifies, the joint box is removed; the end of the first steel cage is exposed outside the concrete; a second steel cage is placed in the predetermined area; a space formed between the middle part of the second steel cage and the formed concrete forms a second pouring space; fluid-state concrete is injected into the second pouring space; and after the concrete solidifies, a complete wall body is formed. The connection between the two times of solidified and formed concrete can greatly improve the structural strength of the concrete wall on both sides, so that it can withstand large pressure and shear force in all directions. Chinese patent document CN108035337A discloses a joint for underground continuous wall and a construction method of underground continuous wall. The joint is composed of a U-shaped steel plate and a one-dimensional steel plate, and one end of the one-dimensional steel plate is connected with the bottom of the U-shaped steel plate along the symmetric axis direction. The construction method of the underground continuous wall is to arrange the joint at the joint of two continuous walls, and the joint is placed horizontally in the continuous wall. The one-dimensional end of the joint is welded to one side of the steel cage, and the other side is convex. The convex end of the steel cage of the rear wall is embedded into the U-shaped groove of the joint of the front wall. The joint combines the characteristics of the one-dimensional steel plate joint and the I-shaped steel joint in terms of water permeation resistance and waterproofness. One end of the joint is welded to the steel cage to maintain the integrity, and the other end embeds the steel cage into the U-shaped groove to increase the contact area and the folding point, thereby strengthening the waterproof effect. The construction method of the continuous wall is simple and easy to operate, has good waterproof effect, and has relatively low cost. Chinese patent document CN118563758A discloses a steel structure for pouring underground continuous wall, which includes a plurality of first steel cages and a plurality of second steel cages. A second steel cage is arranged between adjacent two first steel cages. A joint plate is arranged between the first steel cage and the second steel cage. The joint plate is arc-shaped and has sealing strips on opposite sides. The center of the side of the joint plate away from the second steel cage is fixedly connected to the first steel cage. A joint pipe is attached to the side of the joint plate away from the adjacent first steel cage. One end of the joint pipe inserted into the groove segment is in a circular truncated cone shape to force the arc-shaped ends of the joint plate to move away from each other. This enables the concrete slurry poured into the groove segment to obtain sufficient connection strength between the soil layer and the guide wall during the solidification process, and also reduces the impact of the pulling out of the joint pipe. These existing technologies have their own characteristics and are suitable for their respective occasions, but still have certain limitations.For example, in some cases, two rows of diaphragm walls are required to be arranged side by side, and a plurality of reinforced concrete tie plates (partition walls) are arranged between the two rows of diaphragm walls to improve the overall strength and stability. Based on the needs of on-site construction, the steel reinforcement cage used is a T-shaped steel reinforcement cage, and the inner ends (row insertion ends) of the two T-shaped steel reinforcement cages are butt-jointed in the middle of the partition wall. The main reinforcement at the joint position needs to meet the requirement of 35d overlap. For example, in the case of a 25mm diameter third-class steel reinforcement, the overlap length should be not less than 875mm. If the overlap length does not meet the requirement, the overall engineering quality and wall stability will be affected. Since the existing diaphragm wall steel reinforcement cage connection method cannot achieve such main reinforcement overlap, it is necessary to develop a steel reinforcement cage joint suitable for such wall, and based on the developed steel reinforcement cage joint, to construct a corresponding steel reinforcement cage connection structure and a corresponding construction method. Content of the utility model

[0003] The utility model aims to provide a H-shaped steel row insertion joint and a H-shaped underground continuous wall steel reinforcement assembly using the row insertion joint to meet the construction needs of the H-shaped underground continuous wall.

[0004] The technical scheme of the utility model is: a H-shaped steel row insertion joint is provided with a H-shaped steel (or H-shaped steel), and a steel reinforcement mesh is arranged on each side of the transverse direction (wing plate / H-shaped steel width direction) of each wing plate of the H-shaped steel. The steel reinforcement mesh is rectangular and extends out from the corresponding side of the wing plate in the transverse direction. The longitudinal dimension (H-shaped steel extension direction / H-shaped steel length direction) of the steel reinforcement mesh is smaller than the longitudinal dimension of the H-shaped steel and is located in the middle of the longitudinal direction of the H-shaped steel. In use, the H-shaped steel is arranged vertically, the width direction is along the length direction of the wall and is parallel to the wall surface, and the end portions of the steel reinforcement cages (T-shaped steel reinforcement cage row insertion steel reinforcement cages) on both sides are inserted between the two wing plates on the corresponding side of the H-shaped steel, and the steel reinforcement meshes extending out of the two wing plates are respectively overlapped on the outside of the steel reinforcement cages connected to the corresponding side, so that the main reinforcement overlap required for connection is achieved.

[0005] Further, the steel reinforcement mesh is provided with a plurality of transverse reinforcements (transverse steel reinforcements) which are distributed in the longitudinal direction and are located in the same plane.

[0006] Further, the steel reinforcement mesh can be provided with or can not be provided with longitudinal reinforcements which are cross-connected with the transverse reinforcements to form a mesh structure.

[0007] Further, in the case where the steel reinforcement mesh is not provided with longitudinal reinforcements which are cross-connected with the transverse reinforcements to form a mesh structure, one or more longitudinal or oblique (not parallel to the longitudinal and transverse directions) steel reinforcements can be arranged to fixedly connect each transverse reinforcement into a whole to facilitate on-site operation.

[0008] Preferably, the specifications and spacing of the transverse reinforcements on the steel reinforcement mesh are consistent with those of the transverse reinforcements on the row insertion steel reinforcement cages of the T-shaped steel reinforcement cage.

[0009] Preferably, the inner ends of the reinforcement mesh (e.g. the inner ends of each cross bar) are welded on the outer side of the corresponding flange.

[0010] Preferably, the two flanges of the I-beam are each provided with a stopper plate (or stopper sheet) extending (transversely extending) from at least one side (transverse side) of the flange, which can also extend from both sides to facilitate on-site operation.

[0011] Further, the stopper plate is rectangular and should have moderate flexibility to adhere to the groove wall under the pressure of the injected concrete.

[0012] For example, the stopper plate can be a rectangular thin iron sheet.

[0013] The connecting part (position / region connected on the I-beam) of the stopper plate is located on the outer side of the corresponding flange (the outer side of the outer side), and the outer side is provided with a pressing bar (reinforcing bar for pressing the stopper plate) for pressing the stopper plate on the outer side of the flange, and the pressing bar is fixedly connected (e.g. welded) on the outer side of the flange. For example, the welding part can be divided into two longitudinal sides of the stopper plate.

[0014] Further, the inner ends (connection ends with the flange) of the two reinforcement meshes arranged on the same flange are spaced apart, and the pressing bar is located between the two reinforcement meshes on the same side and in the same plane as the longitudinal bars or transverse diameter on the reinforcement mesh to avoid interfering with the construction work due to outward protrusion.

[0015] The steel reinforcement assembly for the I-shaped underground continuous wall comprises a row plug connector and a reinforcement cage, the row plug connector adopts any one of the I-beam row plug connectors disclosed in the utility model, and the reinforcement cage adopts a T-shaped reinforcement cage.

[0016] Further, the main reinforcement cage and the row plug reinforcement cage are both rectangular cage-shaped, and the row plug reinforcement cage and the main reinforcement cage in the same T-shaped reinforcement cage are integrally prepared.

[0017] Preferably, the row plug reinforcement cage of the T-shaped reinforcement cage is provided with a plug-in part for plugging into the row plug connector (between the two flanges of the corresponding side of the I-beam and the two reinforcement meshes extending from the two flanges, respectively), the width of the plug-in part is smaller than the width of the main part of the row plug reinforcement cage, and a transition section with gradually decreasing width is arranged between the main part and the plug-in part of the row plug reinforcement cage.

[0018] Preferably, among the two ends of the transverse direction (the transverse direction of the main cage) of the main cage of the T-shaped reinforcement cage, one is a concave end, and the other is a convex end, the concave end is a facade concave shape (the concave shape throughout the facade of the end), and the convex end is a facade convex shape (the convex shape throughout the facade of the end). During construction, the main cages of the T-shaped reinforcement cages in the same main wall have the same structure, and the adjacent ends of the adjacent two main cages are a concave end (first constructed) and a convex end (later constructed), which are connected to each other to form a flexible connection between the main cages.

[0019] Preferably, the facade concave shape and the facade convex shape are both in a folded surface shape with edges in the middle, and the angles can be equal or similar to realize the socket type soft connection of the two ends of the adjacent main cages.

[0020] The use mode (the construction mode of the corresponding I-shaped ground continuous wall) of the utility model can be as follows: for any I-shaped wall unit in the I-shaped ground continuous wall, the unit groove section is divided into two T-shaped groove sections of first opening and closure, the first opening groove section is excavated first, after the groove section is formed, the T-shaped reinforcement cage and the row and plug joint are hoisted and placed into the groove section, the row and plug end (the end of the row and plug reinforcement cage) of the T-shaped reinforcement cage is inserted between the two wing plates of the corresponding side of the I-shaped steel of the row and plug joint, the joint box is hoisted and placed into the groove section outside the row and plug joint (away from the side of the T-shaped reinforcement cage), the inner end of the joint box (towards the I-shaped steel web plate end) is inserted between the two wing plates of the corresponding side of the I-shaped steel of the row and plug joint and abuts against the web plate (or web plate) of the I-shaped steel, the joint pipe is hoisted and placed into the groove section outside the concave end of the main cage of the T-shaped reinforcement cage, the inner side of the joint pipe (towards the main cage side) is located in the facade concave shape, the groove gap outside the outer end of the joint box is filled, the groove gap outside the outer side of the joint pipe is filled, and concrete is poured to complete the construction of the first opening groove section, the closure groove section is excavated, after the groove section is formed, the joint box is pulled out, the T-shaped reinforcement cage is hoisted and placed into the groove section, the joint pipe is hoisted and placed into the groove section outside the concave end of the main cage of the T-shaped reinforcement cage, the inner side of the joint pipe (towards the main cage side) is located in the facade concave shape, the groove gap outside the outer side of the joint pipe is filled, and concrete is poured.

[0021] In the case where the row and plug joint has a stop piece on only one side (one transverse side), the side faces the T-shaped reinforcement cage of the first opening groove section.

[0022] Before hoisting the T-shaped reinforcement cage, if it involves the connection with the completed groove section of the same main wall, the joint pipe on the adjacent side of the completed groove section (if any) is pulled out.

[0023] The groove should be cleaned according to actual needs.

[0024] The mud should be injected, circulated and supplemented according to actual needs.

[0025] The guide wall should be set according to actual needs.

[0026] The utility model discloses the beneficial effect is: because adopt the vertical I -steel as the main part of row and insert joint, and set up the steel mesh sheet that extends to both sides respectively on two wing plates, can realize the connection between the row and insert end of both sides T type steel reinforcement cage and the row and insert joint through socket connection mode, the steel mesh sheet that extends on the joint is overlapped on the outside of corresponding side steel reinforcement cage, satisfies the main reinforcement overlap length requirement, realizes reliable connection between steel reinforcement cage and joint, because the outside of at least one side steel mesh sheet on the row and insert joint is provided with the stop slice, and the side of the row and insert joint with the stop slice is towards the steel reinforcement cage in the first opening groove section, when pouring, the stop slice is pushed to the groove wall by the concrete of injection, and the corresponding flow channel of concrete is blocked, effectively avoids the flow phenomenon, guarantees construction quality, because adopts T type steel reinforcement cage, need not carry out the connection of steel reinforcement cage in the wall body intersection part of I -shaped ground continuous wall, not only facilitates construction operation, and guarantees the strength and reliability of steel connection between the partition wall and main wall body, greatly facilitates the channeling and pouring etc. Construction operation of I -shaped ground continuous wall, help to improve construction efficiency, guarantee engineering quality. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the overhead schematic view of the row and insert joint of the utility model relates to;

[0028] Figure 2 It is the overhead schematic view of T type steel reinforcement cage of the utility model relates to;

[0029] Figure 3 It is the three -dimensional schematic view of the connection between the steel assembly of the utility model relates to;

[0030] Figure 4 It is the front view schematic view of the connection between the steel assembly of the utility model relates to;

[0031] Figure 5 It is the side view schematic view of the connection between the steel assembly of the utility model relates to;

[0032] Figure 6 It is the overhead schematic view of I -shaped ground continuous wall of the utility model relates to.

[0033] Marked in the drawing: 11. main wall body;12. partition wall;20. row and insert joint;22. I -steel waist plate;23. I -steel wing plate;25. the steel mesh sheet for overlapping on the row and insert joint;27. stop slice;28. stop slice fixed steel;30. T type steel reinforcement cage;31. main body steel reinforcement cage;32. truss;33. concave end;34. convex end;36. row and insert steel reinforcement cage;37. insert part. DETAILED DESCRIPTION

[0034] See Figures 1-6The utility model relates to the I-shaped (or called H-shaped) anti-scour wall or other similar underground continuous wall of riverway and other occasions, and the I-shaped underground continuous wall is provided with two parallel main wall bodies 11, and a plurality of concrete tie plates 12 perpendicular to the main wall body are arranged between the two main wall bodies, which can be called a partition wall. The vertical dimension of the partition wall can be obviously smaller than the vertical dimension of the main wall body, and usually corresponds to the middle upper part or upper part of the main wall body in the vertical direction. The two ends of the partition wall are respectively connected to the main wall body of the corresponding side as a whole, and at least a part (a section in the vertical direction) of the partition wall is internally provided with steel bars. For example, in one example, the partition wall is a reinforced concrete structure at a distance of 11.5 m-14.5 m from the ground, and the remaining part is a plain concrete structure.

[0035] Due to the influence of site and geological conditions, it is difficult to implement the I-shaped groove section trenching and I-shaped steel cage hoisting in the field. The groove of one I-shaped wall unit is divided into two T-shaped groove sections, and the steel cage is also arranged in a T-shaped manner. One T-shaped groove section (which can be called a first opening groove section) is constructed first, and then another T-shaped groove section (which can be called a closing groove section) is constructed. The row insertion steel cage of the two T-shaped steel cages is connected through a row insertion joint 20 to form the required I-shaped structure.

[0036] In the T-shaped steel cage 30, the part located in the main wall body corresponds to a large rectangular steel cage, which can be called a main steel cage (main steel cage of the T-shaped steel cage) 31. The part located in the partition wall (half of the partition wall) corresponds to a small rectangular steel cage, which can be called a row insertion steel cage (row insertion steel cage of the T-shaped steel cage) 36. The end of the row insertion steel cage (the outer end in the horizontal direction) can be called a row insertion end (row insertion end of the T-shaped steel cage). The main steel cage and the row insertion steel cage in the T-shaped steel cage are integrally prepared. The main reinforcement in the row insertion steel cage perpendicular to the main steel cage (main wall body) extends into the main steel cage (which can extend to the outer side of the main steel cage) and is connected (for example, welded) with the main reinforcement in the main steel cage.

[0037] The row insertion ends of the two T-shaped steel cages connected in the I-shaped structure are respectively inserted into the corresponding side socket of the row insertion joint (between the two flange plates of the I-shaped steel and the steel mesh sheet outside the two flange plates), and the row insertion joint adopts an I-shaped steel (or H-shaped steel) row insertion joint. The rectangular steel mesh sheet 25 for lapping with the row insertion steel cage of the corresponding T-shaped steel cage is welded on both sides of the two flange plates 23 of the I-shaped steel. After the row insertion end is inserted into the row insertion joint, the two steel mesh sheets on the corresponding side of the row insertion joint are respectively lapped on both sides of the row insertion steel cage.

[0038] Manufacture of I-shaped steel row insertion joint

[0039] The I-beam in the row-insert joint is set vertically during use. Steel mesh is welded on the outer side of each wing plate, extending from both sides in the width direction (corresponding to the horizontal direction of the wall surface). The steel mesh is usually formed by the intersection of several horizontal and vertical steel bars. It can also be formed by several horizontal steel bars distributed vertically, without vertical steel bars connected to form a mesh structure. One or more vertical steel bars (or inclined steel bars) can be welded to connect the horizontal steel bars into a whole, facilitating the work. The steel bars and distribution method on the steel mesh can be consistent with those on the steel mesh in the row-insert steel cage, and the vertical position of the steel mesh on the row-insert joint can be adapted to the vertical position of the row-insert steel cage in the T-shaped steel cage to achieve the required overlap. The length of the steel mesh (the size in the length direction of the wall) can be appropriately set according to the overlap length requirement to meet the overlap requirement. In one example, the steel mesh is made of Ф25 steel bars, the length of the steel mesh is 870 mm, the width (vertical size) is 660 mm, and the height of the I-beam is 15.5 m.

[0040] To prevent the flow of concrete during pouring, a stopper sheet (or stopper plate) 27 is provided on the row-insert joint. For example, a 0.2 mm thick, 1000 mm wide thin iron sheet is laid on the outer side of each wing plate of the I-beam and the steel mesh, and a fixed steel bar (pressing bar) 28 with a diameter of 10 mm is used to compact and fix the iron sheet on the outer side of the wing plate. The upper and lower ends of the pressing bar can be welded to the wing plate.

[0041] A joint box is prepared to match the row-insert joint. For the first slot section, the joint box is hung on the other side of the row-insert joint to resist the pressure of the concrete on the row-insert joint and ensure the stability of the row-insert joint during pouring. The joint box is a box body (cylindrical) that is adapted to the socket of the row-insert joint. During use, the joint box is inserted into the socket (between the two wing plates and the steel mesh connected to the two wing plates) on the corresponding side of the row-insert joint. The inner end of the joint box abuts against the web plate 22 of the I-beam, and the outer side (away from the row-insert joint side) of the joint box is located outside the socket of the row-insert joint. The width (size in the width direction of the wall) of the joint box is greater than the width of the main body of the joint box and is approximately equal to the slot width. After being hung in place, the gap (slot gap) on the back side of the joint box is filled with sand and gravel to support the joint box and prevent it from moving or tilting.

[0042] After the slot is formed in the closed slot section, the joint box is pulled out so that the row-insert end of the T-shaped steel cage of the closed slot section can be inserted into the socket on that side of the row-insert joint.

[0043] Manufacture of T-shaped steel cage

[0044] In the prior art, the main reinforcement connection of the T-shaped reinforcement cage can adopt a mechanical connection method. The spacing between the main reinforcements should be greater than 1000 mm, and the number of joints in the same connection area should not be more than 50% of the total number; the longitudinal reinforcement and the transverse reinforcement are connected by electric welding during the processing of the reinforcement cage. A truss 32 is arranged in the reinforcement cage, the truss reinforcement adopts single-sided welding, the length is not less than 10d, the joint positions are staggered, the percentage of welded joints in the same connection section should not be greater than 50%, the intersection of the longitudinal and transverse truss reinforcements needs to be spot welded, the intersections within the range of 0.5 m from the four sides of the reinforcement cage need to be fully spot welded, the overlap and joint inspection should meet the requirements of the reinforced concrete specification. The reinforcement is ensured to be flat and clean without oil stains, 50% of the internal intersections are spot welded, and 100% of the intersections at the upper and lower 1 m of the truss of the reinforcement cage and the lifting point of the reinforcement cage need to be spot welded. This way of production can well ensure the overall flatness of the reinforcement cage and does not affect the lifting.

[0045] The width of the main reinforcement cage and the row-insert reinforcement cage of the T-shaped reinforcement cage is designed according to the width requirement of the main wall and the partition wall. The insertion part (the part near the row-insert end) 37 of the row-insert reinforcement cage is used to insert the socket of the row-insert joint (the space between the two wing plates on the same side and the steel mesh / horizontal reinforcement on the two wing plates), and the width of the insertion part is smaller than the width of the main part of the row-insert reinforcement cage, so as to adapt to the socket requirement. Two horizontal reverse bends can be arranged on the transverse reinforcement to realize the width change between the main part and the insertion part of the row-insert reinforcement cage.

[0046] The connection between the reinforcement cages in the main wall (the main reinforcement cage in the T-shaped reinforcement cage) adopts a concave-convex flexible joint. One end of the main reinforcement cage is arranged in a concave shape, and the other end is arranged in a convex shape. During construction, a joint pipe is placed outside the concave end 33 of the main reinforcement cage of the T-shaped reinforcement cage, and the joint pipe is pulled out after the adjacent slot section is formed, so as to allow the convex end 34 of the main reinforcement cage of the T-shaped reinforcement of the adjacent slot section to be inserted, and the flexible connection of the two main reinforcement cages is realized through the convex-concave cooperation.

[0047] The net protection layer of the reinforcement cage main reinforcement can be set to 70 mm or other thickness specified in the specification, and the horizontal reinforcement end should also leave a certain gap from the joint box and the concrete joint surface. In order to ensure the thickness of the protection layer, a plurality of steel pads are arranged on the horizontal reinforcement, the center distance between the steel pads is 3 m, and each face in each row should not be less than 2 blocks. The pads are made of 4 mm thick flat steel, and other suitable ways can also be used to arrange the steel pads.

[0048] Hoisting of the reinforcement cage (T-shaped reinforcement cage) and the row-insert joint

[0049] In order to ensure that the reinforcement cage has a certain rigidity and prevent deformation during lifting, two reverse U-shaped reinforcing bars can be arranged at the lifting point position, one lifting point and one fork lever point. The two ends of the reinforcing bars should be firmly welded with the longitudinal reinforcement.

[0050] The reinforcement cage is hoisted in one piece. When the reinforcement cage is being processed, the lifting points are set according to the weight and size of the reinforcement cage and the lifting method, and the hoisting is strictly carried out according to the hoisting scheme to ensure safety during lifting.

[0051] If it is the first groove section, the row plug connector should be hoisted and placed at the same time.

[0052] If it is a closed groove section, the row plug connector should be pulled out first.

[0053] When the reinforcement cage enters the groove, the center of the lifting point must be aligned with the center of the groove section, and attention should be paid to avoid swinging of the lifting arm or other influences to cause lateral swinging of the reinforcement cage, so as to avoid collapse of the lateral wall.

[0054] After the reinforcement cage is placed in the groove, check whether the top elevation meets the design requirements, and then fix it on the guide wall.

[0055] If the reinforcement cage cannot be smoothly inserted into the groove, it should be hoisted out again. After the cause is found and the problem is solved, it will be hoisted and placed again, and if necessary, the groove will be repaired. The reinforcement cage should not be forcibly inserted into the foundation groove in the form of free fall, otherwise it will cause deformation of the reinforcement cage or collapse of the groove wall, resulting in a large amount of sediment at the bottom of the groove.

[0056] The reinforcement cage is placed into the groove by using one main hoist / crane (for example, a 100-ton crawler crane) and one auxiliary hoist (for example, a 60-ton crawler crane). After the main and auxiliary cranes vertically lift the reinforcement cage off the ground, the auxiliary hook is removed, the groove section is aligned, and the reinforcement cage is slowly lowered into the groove wall. When the top surface of the guide wall is reached, a steel pole is passed through the top of the reinforcement cage and placed on the top surface of the guide wall. The main hook is transferred to the lifting bar, the reinforcement cage is lifted to the design elevation, and finally the steel pole is used to hold the reinforcement cage and placed on the top surface of the guide wall.

[0057] For the first groove section, after the reinforcement cage and the row plug connector are hoisted and placed, the connector box is hoisted and placed on the other side of the row plug connector, the connector pipe is hoisted and placed outside the concave end of the main reinforcement cage, and the gap between the connector box and the connector pipe is backfilled with gravel to avoid / block the lateral pressure generated during concrete pouring from moving the connector box, the connector pipe or the reinforcement cage. The particle size of the gravel can be 10-15 cm.

[0058] For the closed groove section, after the reinforcement cage is hoisted and placed, the connector pipe is hoisted and placed outside the concave end of the main reinforcement cage, and the gap between the connector pipe and the groove is backfilled with gravel to avoid / block the lateral pressure generated during concrete pouring from moving the connector box, the connector pipe or the reinforcement cage. The particle size of the gravel can be 10-15 cm.

[0059] In one example, the 6m first open amplitude (double I-steel) reinforcement cage weighs 9.5t, multiple lifting points are set, the first one is set at the top end of the reinforcement cage 1.5m downward, 2 lifting points are set above and below, and the main hoist is responsible for lifting; the second one is set 8m downward from the first one, 2 lifting points are set on the upper layer, the third one is set 3.0m downward from the second one, 2 lifting points are set on the upper part, the fourth one is set 8m downward from the third one, 2 lifting points are set on the upper part, the fifth one is set 5.0m downward from the fourth one, 2 lifting points are set on the upper part, and the fourth and fifth ones are responsible for lifting by the vice hoist.

[0060] In one example, the first main lifting ring position sets a " ] " shaped support bar, a total of 4 are welded with the longitudinal main reinforcement. The main lifting ring adopts a "U" shaped reinforcement cage, each lifting point and lifting ring adopts a Φ25 round steel, which is welded between the two main reinforcements, and the welding length is not less than 10d on one side or 5d on both sides, the welding is full and has no cracks, the bending shape is regular, the elevations of the same row of lifting rings are basically the same, and there should be no large differences. The second to fourth main lifting rings adopt Φ25 round steel hot bending into a " few " shape, and the two main reinforcements at the main lifting ring position are double-sided welded at the intersection with the distributed reinforcement. The lifting ring and the truss reinforcement are fully welded, the welding length should not be less than 10d, the effective thickness of the welding should not be less than 0.3 times the diameter of the main reinforcement, and the welding width should not be less than 0.8 times the diameter of the main reinforcement. The intersection position of the horizontal distributed reinforcement within 1m above and below the lifting point should be double-sided spot welded. The main reinforcement is spot welded on both sides of the transverse truss reinforcement.

[0061] Butt joint of T-shaped reinforcement cage: two T-shaped reinforcement cages corresponding to the two sides of the I-shaped wall are respectively called reinforcement cage A and reinforcement cage B. First, excavate unit slot section A (which can be called first opening slot section) of reinforcement cage A, hoist and place reinforcement cage A and row insertion joint together to the set position in unit slot section A. The slot length corresponding to the partition wall in unit slot section A should adapt to the placement of reinforcement cage A (row insertion reinforcement cage of reinforcement cage A) and row insertion joint. Insert the row insertion end of reinforcement cage A into the corresponding side socket of row insertion joint, hoist and place joint box to the other side of row insertion joint, insert it into the other side socket of row insertion joint, fill the gap on the outer side (far from the other side of row insertion reinforcement cage of reinforcement cage A), then implement concrete pouring of slot section A. After pouring is completed, excavate unit slot section B (which can be called closed slot section) of reinforcement cage B, pull out joint box, hoist and place reinforcement cage B into slot section B, insert the row insertion end of reinforcement cage B into the corresponding side socket of row insertion joint, thereby realizing the connection of row insertion reinforcement cages of reinforcement cage A and reinforcement cage B through row insertion joint, forming the built-in reinforcement of partition wall, setting joint pipe and backfilling the gap, then implementing concrete pouring of slot section B, and completing the construction of I-shaped wall.

[0062] Other matters of reinforcement cage processing and setting:

[0063] Reinforcement cage is made according to the reinforcement drawing of diaphragm wall (for example, impact prevention wall) and the division of unit slot section;

[0064] The main reinforcement of the wall body is connected by mechanical connection method, which is executed according to the General Technical Specification for Steel Bar Mechanical Connection (JGJ107-2016). The spacing between the main reinforcement joints is greater than 1000mm, and the number of joints in the same connection area should not be more than 50% of the total number;

[0065] If the wall body requires pre-embedded parts, the elevation error of the pre-embedded parts should not be greater than 10mm;

[0066] The longitudinal main reinforcement at the lower end of the steel reinforcement cage should be bent inward to prevent the reinforcement from scratching the slot wall during lifting, but the degree of inward bending should not affect the insertion of the pouring conduit for pouring concrete;

[0067] When making the steel reinforcement cage, the position of the pouring conduit for pouring concrete should be determined in advance. Since this part of the space needs to be connected up and down, it can be reinforced by adding hoop reinforcement and connecting reinforcement around it according to actual needs;

[0068] To prevent the reinforcement from being stuck in the conduit, the longitudinal main reinforcement should be placed on the inside, and the horizontal reinforcement should be placed on the outside.

[0069] The net protection layer of the main reinforcement of the steel reinforcement cage is 70mm, and a certain gap should be left between the end of the horizontal reinforcement and the joint box and the concrete joint surface. To ensure the thickness of the protection layer, steel pads are placed on the horizontal reinforcement, with a center spacing of 3m, not less than 2 blocks per face per row, and the pads are made of 4mm thick flat steel.

[0070] For wall bodies with embedded pre-embedded parts (such as stress meters, inclinometers, water pressure gauges and other test elements), positioning is required, protection work is done well, and the survival rate of each test element is guaranteed.

[0071] To prevent concrete from flowing around during pouring, a stop plate is used, which is a 0.2mm thick, 1000mm wide thin iron sheet placed on both sides of the I-beam near the reinforcement, and a diameter of 10mm is used to press and fix it on the I-beam.

[0072] The construction process of the I-shaped wall body (the first opening slot section) mainly includes:

[0073] T-shaped slot grooving

[0074] The trenching construction mainly adopts GB80S trencher (underground continuous wall hydraulic grab) to trench, and the unit trench section is T-shaped trench. Before the trenching construction, the slurry is firstly injected into the guide wall, and the hydraulic grab is positioned in the trench section to be constructed. When the trenching, the teeth of the fully opened hydraulic grab are aligned with the edge line of the trench section, and directly grab to the bottom of the trench. The interval (jump) construction is adopted between the unit trench sections. The construction sequence in the unit trench section is the end first and the middle later. The slurry is supplemented into the trench in time while the trenching is excavated. After the trenching reaches the design elevation, the machine is moved to enter the bottom cleaning work. The verticality should be controlled during the trench section construction, the position of the grab is controlled through the guide trench, and the inclination of the grab is adjusted in time according to the computer display of the hydraulic trencher.

[0075] Setting of reinforcement cage, row plug joint and joint box

[0076] For the first trench section, the T-shaped reinforcement cage and row plug joint are hoisted into the trench, and then the joint box is hoisted.

[0077] In order to ensure that the reinforcement cage has a certain rigidity and prevent deformation during hoisting, longitudinal truss bars are arranged on the reinforcement cage, and two anti-U-shaped reinforcing bars are arranged at the hoisting point position, one hoisting point and one fork lever point. The two ends of the reinforcing bars should be firmly welded with the longitudinal bars.

[0078] The reinforcement cage and row plug joint are hoisted integrally at one time. When the reinforcement cage is processed, the hoisting point position is set according to the weight and size of the reinforcement cage and the hoisting mode, and the hoisting is strictly carried out according to the hoisting scheme to ensure the safety during hoisting.

[0079] When the reinforcement cage and row plug joint enter the trench, the center of the hoisting point must be aligned with the center of the trench section, and the hoisting arm should not swing or be affected by other factors to cause the reinforcement cage to swing horizontally, so as to avoid causing the horizontal wall to collapse.

[0080] After the reinforcement cage and row plug joint are put into the trench, it is checked whether the top elevation meets the design requirements, and then it is fixed on the guide wall.

[0081] The method of placing the reinforcement cage into the trench is as follows: one main crane / hoist (for example, 100-ton crawler crane) and one auxiliary crane / hoist (for example, 60-ton crawler crane) are adopted. After the reinforcement cage is vertically lifted off the ground by the main and auxiliary hoists, the auxiliary hook is removed. The row plug joint is directly hoisted by the 100-ton crawler crane. Align the trench section position, slowly lower into the trench wall, when reaching the top surface of the guide wall, pass the steel pole through the top of the reinforcement cage, rest on the top surface of the guide wall, transfer the main hook to the hoisting bar, hoist the reinforcement cage to the design elevation, and finally rest the reinforcement cage on the top surface of the guide wall with the steel pole.

[0082] After the reinforcement cage and the joint box are lowered, the joint box is lowered along the I-shaped steel to the bottom of the impact protection wall, and the outside (equivalent to the other side of the reinforcement cage) is backfilled with gravel between the wall to resist the lateral pressure to the joint when the concrete is poured, so that the reinforcement cage is prevented from moving. The particle size of the gravel is 10-15 cm.

[0083] Concrete pouring

[0084] The concrete of the main wall (for example, the impact protection wall) part is poured first, and when the partition wall guide pipe is embedded in the concrete liquid surface 0.5 m-1 m, the concrete of the transverse partition wall and the main wall is synchronously poured.

[0085] The concrete pouring should be started within 4 hours after the bottom cleaning and mortar replacement are completed. The derrick is firmly erected, the guide pipe is arranged in the clamping groove in the central hole of the derrick, the top end of the guide pipe is placed in the storage hopper, the first pouring amount of the concrete should ensure that the lower end of the guide pipe is embedded in the concrete, and the embedding depth of the guide pipe is not less than 2 m. The pouring should be continuously carried out, the height difference between any two points on the top surface of the concrete on the two sides is not greater than 50 cm, and the rising speed of the concrete surface is controlled to be 3 m / h-5 m / h; the insertion depth of the lower end of the guide pipe into the concrete should be controlled to be 2-6 m. The pouring depth is measured in time by using a measuring rope, the guide pipe is lifted in time along with the pouring, the guide pipe is pulled out when the pouring is completed, and the pouring is completed.

[0086] The concrete should be continuously poured, and cannot be interrupted for a long time. Generally, interruption of 5-10 min is allowed, and the longest interruption is only allowed for 20-30 min, so that the uniformity of the concrete is ensured. After the concrete is mixed, the pouring should be completed within 1.5 h.

[0087] The joint pipe should be prevented from flowing around during the pouring of the concrete. The joint pipe is pulled out in combination with the pouring of the concrete, and is pulled out about 4-5 h after the pouring of the concrete is started. Then the joint pipe is pulled out every 30 min, and the amplitude is not greater than 50-100 mm. When the pouring of the concrete is completed, that is, the concrete reaches the final setting, the joint pipe is pulled out.

[0088] After the first groove section is completed, the closed groove section construction is implemented, and the specific steps and modes are basically the same as those of the first opening construction. The joint box of the joint pipe is pulled out, and corresponding cleaning is carried out.

[0089] The various preferred and optional technical means disclosed in the utility model can be combined at will to form different specific embodiments, except that the specific embodiments are particularly described or one preferred or optional technical means is further limited by another technical means.

Claims

1. A H-steel row splicing joint, provided with H-steel, characterized in that Each of the flanges of the I-shaped steel is provided with a steel mesh, which is rectangular and extends transversely from the corresponding side of the flange, and the longitudinal dimension of the steel mesh is smaller than the longitudinal dimension of the I-shaped steel and is located in the middle of the I-shaped steel in the longitudinal direction.

2. The I-beam array connector of claim 1, wherein The steel mesh is provided with a plurality of transverse bars, which are spaced apart in the longitudinal direction and located in the same plane.

3. The I-beam array connector of claim 2, wherein The steel mesh is provided with or not provided with longitudinal bars intersecting with the transverse bars to form a mesh structure, and in the case where the steel mesh is not provided with longitudinal bars intersecting with the transverse bars to form a mesh structure, one or more longitudinal or oblique steel bars are arranged to fixedly connect the transverse bars into a whole.

4. A H-Section bar spigot joint as claimed in any one of claims 1 to 3, characterised in that The I-shaped steel is provided with a stop piece on each of the flanges, and the stop piece extends from at least one side of the flange.

5. The I-beam array connector of claim 4, wherein The connecting portion of the stop piece is located on the outer side of the corresponding flange, and the outer side of the connecting portion of the stop piece is provided with a pressing bar for pressing the stop piece against the outer side of the flange, and the pressing bar is fixedly connected to the outer side of the flange.

6. The I-beam array connector of claim 5, wherein The inner ends of the two steel meshes arranged on the same flange are spaced apart, and the pressing bar is located between the two steel meshes on the same side.

7. Reinforcement assembly for a I-shaped underground diaphragm wall, characterized in that The utility model provides a row of I-shaped steel row connectors, a T-shaped steel cage and a method for manufacturing the T-shaped steel cage. The utility model provides a row of I-shaped steel row connectors, a T-shaped steel cage and a method for manufacturing the T-shaped steel cage. The utility model provides a row of I-shaped steel row connectors, a T-shaped steel cage and a method for manufacturing the T-shaped steel cage.

8. The rebar assembly of claim 7, wherein The utility model provides a row of I-shaped steel row connectors, a T-shaped steel cage and a method for manufacturing the T-shaped steel cage.

9. The rebar assembly of claim 7, wherein The utility model provides a row of I-shaped steel row connectors, a T-shaped steel cage and a method for manufacturing the T-shaped steel cage.

10. A reinforcement assembly as claimed in any one of claims 7 to 9, wherein ​

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