General large-thrust joint box for diaphragm wall and its construction method

Abstract

The present invention relates to a general large-thrust connector box for diaphragm walls, which includes a top-section connector box, a standard-section connector box, and a bottom-section connector box. Vertically, an entire connector box is assembled by one top-section connector box, multiple standard connector boxes, and one bottom connector box. During construction, two entire connector boxes are used symmetrically. Each single-section connector box has a closed structure, and four sets of top-release devices are arranged inside to accommodate diaphragm walls of different widths by adding or reducing nylon shoe plates on both sides of the connector box and then lowering them into the trench together. The present invention can adapt to diaphragm wall trenches of different widths by adding or reducing nylon shoe plates. At the same time, it also has good versatility for two types of joint forms, namely cross-shaped steel plate joints and H-shaped steel joints, can be recycled, has a high utilization rate, saves construction costs, and has good economic characteristics.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm wall construction, and particularly to a general large-thrust joint box for diaphragm walls and its construction method. Background Technique

[0002] In the construction of diaphragm wall joints, according to different working conditions, there are traditional ordinary lock pipe joints, cross steel plate joints, H-shaped steel joints, GXJ rubber joints, etc. H-shaped steel joints and cross steel plate joints have good water-stop effects and are the most common diaphragm wall joint forms at present. During actual construction, as the depth of the diaphragm wall becomes deeper and deeper, conventional reaction boxes cannot be used. The main reason is that after the diaphragm wall above 50m in depth is poured, the lateral force on the reaction box is very large, causing deformation and making it difficult to extract. To solve this problem, methods such as backfilling sandbags at the bottom of the trench are mostly adopted, which easily cause problems such as turbulent flow after pouring, resulting in insufficient anti-seepage performance of the diaphragm wall and causing quality problems of the diaphragm wall. The joint box must be able to withstand the large lateral force during the concrete pouring process, and at the same time ensure straightness, with sufficient stiffness and strength. Therefore, the joint box adopts a steel structure form, which increases the steel consumption, but is rarely reused, and the construction cost is relatively high; it occupies and pollutes the construction site during storage, and the economy is poor.

[0003] Therefore, it is envisaged to have a general large-thrust joint box for diaphragm walls, which can not only ensure its stiffness, strength and straightness, be easily extracted during the extraction process, not damage the joint, ensure the anti-seepage performance of the joint, but also adapt to two joint processes of cross steel plates and H-shaped steel, and can be universal for diaphragm walls of different widths, and can be reused, greatly improving the utilization rate of the joint box. Summary of the Invention

[0004] The purpose of the present invention is to provide a general large-thrust joint box for diaphragm walls and its construction method to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A general large-thrust joint box for diaphragm walls includes a top joint box, a standard joint box, and a bottom joint box. Vertically, one top joint box, multiple standard joint boxes, and one bottom joint box are assembled into a whole joint box. During construction, two whole joint boxes are used symmetrically; a single joint box is a closed structure, and four sets of top release devices are arranged inside to increase or decrease the nylon boot plates on both sides of the joint box according to the width of the diaphragm wall and then sink them into the trench section together.

[0007] Further, one end of the standard joint box is provided with a male head of the joint box segment, and the other end is provided with a female head of the joint box segment. During assembly, the female head of the upper joint box is sleeved into the male head of the lower joint box and fixed with a connecting pin shaft.

[0008] Further, the lower part of the bottom joint box adopts a pointed structure with a one-way valve. The pointed end is convenient for inserting into the bottom of the groove, and the one-way valve is used to discharge a small amount of infiltrated mud when pulling out the joint box.

[0009] Further, the top-pulling device includes an oil cylinder seat, two oil cylinders and a large flat shoe plate. The oil cylinder seat is welded inside the joint box body; the cylinder barrels of the two oil cylinders are fixed in the oil cylinder seat and provided with an oil cylinder seat flange gasket.

[0010] Further, the piston head of the oil cylinder adopts a ball head form. The two ball heads are installed on a large flat shoe plate to cope with the situation where the piston rod is subjected to a lateral force during the operation of the oil cylinder due to the uneven wall surface, resulting in damage to the oil cylinder.

[0011] Further, the end face of the large flat shoe plate and the opening of the box body are sealed by a large flat shoe plate rubber seal ring to prevent concrete from pouring into the joint box.

[0012] Further, nylon shoe plate connection holes are provided on both sides of the joint box. When the diameter needs to be enlarged, the nylon shoe plates are placed on both sides of the joint box with countersunk head screws. When the diameter does not need to be enlarged, the connection holes are blocked with countersunk head screws to achieve the tightness and versatility of the joint box.

[0013] A construction method for a general-purpose large-thrust joint box of a diaphragm wall uses a general-purpose large-thrust joint box of a diaphragm wall, including the following steps:

[0014] (1) After the groove section is excavated, lower a steel reinforcement cage with a cross-shaped steel plate joint or an H-shaped steel joint.

[0015] (2) According to the width of the diaphragm wall, decide whether to install nylon shoe plates on both sides of the joint box.

[0016] (3) Lower the bottom joint box behind the joint of the diaphragm wall. If it is a cross-shaped steel plate joint, the two bottom joint boxes are respectively placed on both sides of the longitudinal water-stop steel plate of the cross-shaped steel plate. If it is an H-shaped steel joint, the two bottom joint boxes are assembled together and lowered synchronously.

[0017] (4) Connect the standard joint box and the bottom joint box by female and male heads. The female head of the upper joint box is sleeved onto the male head of the lower joint box, and a connecting pin shaft is inserted and fixed. Repeat the above steps until the whole joint box is inserted to the bottom of the groove.

[0018] (5) Backfill the back of the joint box with gravel or clay and compact it.

[0019] (6) Pour concrete, and excavate the groove section behind the joint box after the concrete begins to set.

[0020] (7) After the concrete reaches a certain strength, gradually start the top-pulling device inside the joint box from top to bottom, so that the joint box gradually detaches from the concrete wall.

[0021] (8) The top-pulling devices of the joint box sections that have detached from the wall retract the oil cylinders in sequence to reset the large-plane shoe plates. After the joint box has completely detached from the wall, lift the joint box.

[0022] (9) Clean the attachments on the back of the diaphragm wall joint and perform bottom cleaning to ensure the quality of the continuous wall.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. Through the technical solution of the present invention, for diaphragm wall groove sections of the same width, the designed size of this joint box body can be applicable to the sinking spaces of two joint processes, namely H-shaped steel joints and cross steel plate joints; for diaphragm wall groove sections of different widths, this joint box can also be adapted by increasing or decreasing nylon shoe plates. It has good versatility, can be recycled, has a high utilization rate, saves construction costs, and has good economy.

[0025] 2. Each top-pulling device of the present invention is internally provided with two oil cylinders. Using the large thrust of the double oil cylinders for top-pulling can more easily, conveniently, and effectively peel off the joint box. At the same time, the top-pulling device uses a ball joint connection between the oil cylinder and the large-plane shoe plate, effectively protecting the oil cylinder and preventing the piston rod from being subjected to lateral force during the operation of the oil cylinder due to uneven wall surface, which may cause damage to the oil cylinder.

[0026] 3. The present invention can be fully inserted to the bottom of the groove in the depth direction of the groove section without filling sandbags at the bottom. Moreover, through the male-female head positioning connection of the joint box body, the stiffness and straightness of the joint box are ensured, effectively blocking the seepage of water in the diaphragm wall.

[0027] 4. The overall structure of the present invention is light in weight and good in sealing performance. The top-pulling device adopts a double-stage seal of a large-plane shoe plate sealing ring and an oil cylinder seat flange gasket. During extraction, no mud will be attached inside. Even if there is a slight mud leakage, the one-way valve of the bottom joint box can ensure that the mud flows back into the groove through the one-way valve during the extraction of the joint box, without causing mud waste and pollution, being friendly to the construction environment and having good sociality. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the standard joint box of the embodiment of the present invention;

[0029] Figure 2 It is Figure 1 the left sectional view of

[0030] Figure 3Schematic diagram of the bottom joint box structure of the embodiment of the present invention;

[0031] Figure 4 Schematic diagram of the male and female head connection structure of the embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the top ejection device structure of the embodiment of the present invention;

[0033] Figure 6 Schematic diagram of the box body diameter expansion structure of the embodiment of the present invention;

[0034] Figure 7 Schematic diagram of the diameter expansion structure at the connection of the male and female heads of the embodiment of the present invention;

[0035] Figure 8 Schematic diagram of the construction state of the cross joint process of the embodiment of the present invention;

[0036] Figure 9 Schematic diagram of the construction state of the H-shaped steel joint process of the embodiment of the present invention;

[0037] Figure 10 Schematic diagram of the construction state of the diaphragm wall with a wider width of the embodiment of the present invention;

[0038] In the figure: 1. Joint box body; 2. Top ejection device; 3. Male head of the joint box segment; 4. Female head of the joint box segment; 5. Connecting pin shaft; 6. Check valve; 7. Cylinder seat; 8. Cylinder; 9. Large flat shoe plate; 10. Cylinder seat flange gasket; 11. Large flat shoe plate rubber sealing ring; 12. Nylon shoe plate. Specific implementation manners

[0039] The present invention will be further described below in conjunction with the drawings and embodiments.

[0040] As Figures 1 to 7 shown, a general large-thrust joint box for diaphragm walls is assembled into a whole in the vertical direction by multiple joint box segments. Nylon shoe plates on both sides of the joint box are added or reduced to cope with diaphragm walls of different widths and are sunk into the groove section together. During construction, two joint boxes are used symmetrically.

[0041] As Figure 1 , 2, 3 shown, the joint box segment is a closed structure and is divided into a top joint box, a standard joint box, and a bottom joint box. Each segment includes a joint box body 1 and a top ejection device 2. Four groups of top ejection devices 2 are arranged inside a single joint box body 1.

[0042] As Figure 1, as shown in Figures 2 and 4, the standard joint box has a male head (protruding head) 3 at one end and a female head (recessed head) 4 at the other end of the joint box segment. During assembly, the female head 4 of the upper joint box is sleeved onto the male head 3 of the lower joint box and fixed with a connecting pin shaft 5. The assembly of the female and male heads is positioned at both ends to ensure the straightness of the joint box and the bending resistance of the joint box part.

[0043] As Figure 3 shown, the bottom joint box has a structure with a pointed head with a one-way valve 6 at the bottom. The pointed head facilitates insertion into the bottom of the groove. The one-way valve 6 mainly functions to discharge a small amount of infiltrated mud when pulling out the joint box.

[0044] As Figure 5 shown, the top-pulling device 2 includes an oil cylinder seat 7, two oil cylinders 8, and a large flat shoe plate 9. The oil cylinder seat 7 is welded inside the joint box body 1. Two upper and lower oil cylinders 8 are arranged inside a single top-pulling device 2. The oil cylinder barrel is fixed in the oil cylinder seat 7 and an oil cylinder seat flange gasket 10 is provided. The piston head of the oil cylinder is in the form of a ball head. The two ball heads are installed on a large flat shoe plate 9 to cope with the situation where the piston rod is subjected to a lateral force during the operation of the oil cylinder due to the uneven wall surface, resulting in damage to the oil cylinder. For the large flat shoe plate 9, its end face is sealed with a large flat shoe plate rubber sealing ring 11 at the opening of the box body to prevent concrete from entering the joint box during pouring. Nylon shoe plate connection holes are provided on both sides of the joint box. As Figure 6 , as shown in Figure 7, when diameter expansion is required, the nylon shoe plate 12 is placed against both sides of the joint box with countersunk screws. When diameter expansion is not required, the connection holes are blocked with countersunk screws to achieve the airtightness and versatility of the joint box.

[0045] As Figures 8 to 10 shown, a construction method for a general-purpose large-thrust joint box for diaphragm walls includes the following steps:

[0046] (1) After the groove section is excavated, lower the steel reinforcement cage with a cross-shaped steel plate joint or an H-shaped steel joint.

[0047] (2) According to the width of the diaphragm wall, decide whether to install the nylon shoe plate 12 on both sides of the joint box.

[0048] (3) Lower the bottom joint box behind the joint of the diaphragm wall. If it is a cross-shaped steel plate joint, the two bottom joint boxes are respectively placed on both sides of the longitudinal water-stop steel plate of the cross-shaped steel plate. If it is an H-shaped steel joint, the two bottom joint boxes are assembled together and lowered synchronously.

[0049] (4) Connect the standard joint box and the bottom joint box through the female and male heads. The female head 4 of the upper joint box is sleeved onto the male head 3 of the lower joint box and the connecting pin shaft 5 is inserted and fixed. Repeat the above steps until the joint box is inserted to the bottom of the groove as a whole.

[0050] (5) Backfill the back of the joint box with gravel or clay tightly.

[0051] (6) Pour concrete, and excavate the groove section behind the connector box after the concrete begins to set.

[0052] (7) After the concrete reaches a certain strength, gradually start the top-release device 2 in the connector box from top to bottom to gradually separate the connector box from the concrete wall.

[0053] (8) The top-release devices 2 of the connector box segments separated from the wall retract the oil cylinders 8 in sequence to reset the large-plane shoe plates 9. After the connector box is completely separated from the wall, lift the connector box.

[0054] (9) Clean the attachments on the back of the diaphragm wall joint and perform bottom cleaning to ensure the quality of the diaphragm wall.

Claims

1. A general large-thrust joint box for diaphragm walls, characterized in that: It includes a top joint box, standard joint boxes, and a bottom joint box. Vertically, one top joint box, multiple standard joint boxes, and one bottom joint box are assembled into a complete joint box. During construction, two complete joint boxes are used symmetrically. The single-section joint box is of a closed structure, and four groups of top release devices are arranged inside to increase or decrease the nylon boot plates on both sides of the joint box according to the width of the diaphragm wall and then sink them into the groove section together. Nylon boot plate connection holes are provided on both sides of the joint box. When diameter expansion is required, the nylon boot plates are placed against both sides of the joint box with countersunk screws. When diameter expansion is not required, the connection holes are plugged with countersunk screws, thus achieving the airtightness and versatility of the joint box.

2. The universal large-thrust joint box for diaphragm wall according to claim 1, wherein: One end of the standard joint box is provided with a male head of the joint box section, and the other end is provided with a female head of the joint box section. During assembly, the female head of the upper joint box is sleeved into the male head of the lower joint box and fixed with a connecting pin shaft.

3. The universal large-thrust connector box for diaphragm wall according to claim 1, characterized in that: The lower part of the bottom joint box adopts a pointed structure with a one-way valve. The pointed shape facilitates insertion into the bottom of the groove, and the one-way valve is used to discharge a small amount of infiltrated slurry when the joint box is pulled out.

4. The universal large-thrust connector box for diaphragm walls according to claim 1, characterized in that: The top release device includes an oil cylinder seat, two oil cylinders, and a large flat boot plate. The oil cylinder seat is welded inside the joint box body; the cylinder barrels of the two oil cylinders are fixed in the oil cylinder seat and an oil cylinder seat flange gasket is provided.

5. The universal large-thrust joint box for diaphragm wall according to claim 4, wherein: The piston head of the oil cylinder adopts a ball head form. The two ball heads are installed on a large flat boot plate to cope with the situation where the piston rod of the oil cylinder is subjected to a lateral force during the operation of the oil cylinder due to the uneven wall surface, resulting in damage to the oil cylinder.

6. The universal large-thrust connector box for diaphragm wall according to claim 5, wherein: The end face of the large flat boot plate and the opening of the box body are sealed by a large flat boot plate rubber sealing ring to prevent concrete from pouring into the joint box during concrete pouring.

7. A construction method of a general large-thrust connector box for diaphragm walls, using the general large-thrust connector box for diaphragm walls according to any one of claims 1-6, characterized in that: It includes the following steps: (1) After the groove section excavation is completed, sink a steel reinforcement cage with a cross steel plate joint or an H-shaped steel joint. (2) According to the width of the diaphragm wall, decide whether to install nylon boot plates on both sides of the joint box. (3) Sink the bottom joint box behind the joint of the diaphragm wall. If it is a cross steel plate joint, the two bottom joint boxes are respectively placed on both sides of the longitudinal water stop steel plate of the cross steel plate. If it is an H-shaped steel joint, the two bottom joint boxes are assembled together and then lowered synchronously. (4) Connect the standard joint box and the bottom joint box by female and male heads and pins. The female head of the upper joint box is sleeved into the male head of the lower joint box, and the connecting pin shaft is inserted and fixed. Repeat the above steps until the whole joint box is inserted to the bottom of the groove. (5) Backfill the back of the joint box with gravel or clay and compact it. (6) Pour concrete. After the concrete begins to set, excavate the groove section behind the joint box. (7) After the concrete reaches a certain strength, gradually start the top release devices inside the joint box from top to bottom to gradually separate the joint box from the concrete wall. (8) The top release devices of the joint box sections separated from the wall retract the oil cylinders in turn to reset the large flat boot plates. After the joint box is completely separated from the wall, lift the joint box. (9) Clean the attachments on the back of the diaphragm wall joint and carry out bottom cleaning to ensure the quality of the diaphragm wall.

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