A combined sleeve milling joint device and its construction method

Abstract

This invention relates to a combined milling joint device, comprising a joint device and auxiliary devices. The joint device sequentially includes a guide layer, an intermediate waterproof layer, and an isolation layer. The inner side of the intermediate waterproof layer is bonded to the guide layer. The isolation layer is non-fixedly attached to the outer side of the intermediate waterproof layer. The guide layer is used to conformally fix to the side of the reinforcing cage. The auxiliary devices are located on both sides of the reinforcing cage and cover the milling area, with a gap greater than zero between the milling area and the joint device. The auxiliary devices have a connecting structure, which is connected to the isolation layer to form a whole. This invention improves the impermeability of underground connecting walls, enhances the flatness of the walls, and the zigzag shape of the guide layer is beneficial for the shear resistance of the joint.

Description

Technical Field

[0001] This invention relates to a combined sleeve milling joint device and its construction method, belonging to the field of underground continuous wall construction technology. Background Technology

[0002] Although the underground diaphragm wall is called a "continuous wall", in actual construction, it is constructed by excavating trenches and pouring concrete in sections. Joints need to be set at one or both ends of the trench section that are in contact with the soil layer to avoid direct contact between the concrete and the soil and to ensure that the joints have a certain water-stopping ability.

[0003] Currently, when the trench wall penetrates into harder soil layers or has a large trench depth, and when there are high requirements for environmental protection, milling joints are commonly used. This technology is a construction process based on a twin-wheel milling machine. The rotating milling wheels of the twin-wheel milling machine use alloy teeth on the milling wheels to mill the concrete joint surface of the first-stage trench section into a sawtooth shape, which is similar to the roughening effect commonly used in the construction joint of new and old concrete. This allows the concrete of the second-stage trench section poured later to form a good interlock at the joint with the concrete of the first-stage trench section.

[0004] Compared to other joints (such as interlocking pipe joints and H-beam joints), milling sleeve joints do not require specialized connectors or special sealing measures to form a relatively continuous and dense wall, exhibiting better overall integrity. However, milling sleeve joints are essentially flexible joints, especially for non-circular foundation pits. Once the foundation pit deforms, water leakage is prone to occur at the joint location, requiring the additional installation of a separate water-stop curtain, increasing project costs.

[0005] In addition, each trench section is relatively narrow (e.g., 2.8m) and has a large number of joints. When trenching, adjacent trench sections are prone to unevenness in the direction perpendicular to the ground wall, similar to a "misalignment" phenomenon, which affects the quality of trenching. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by proposing a combined milling joint device and its construction method that can enhance the flatness and impermeability of the ground wall.

[0007] The present invention adopts the following technical solution:

[0008] A combined milling joint device includes a joint device A and an auxiliary device B. The joint device A sequentially includes a guide layer 1, an intermediate waterproof layer 2, and an isolation layer 3. The inner side of the intermediate waterproof layer 2 is bonded to the guide layer 1. The isolation layer 3 is non-fixedly attached to the outer side of the intermediate waterproof layer 2. The guide layer 1 is used to conformally fix to the side of the reinforcing cage. The auxiliary device B is located on both sides of the reinforcing cage and covers the milling area. The gap between the milling area and the joint device A is greater than zero. The auxiliary device B has a connecting structure, which is connected to the isolation layer 3 to form an integral whole.

[0009] Preferably, the planar shape of the guide layer 1, the intermediate waterproof layer 2, the isolation layer 3, and the side of the reinforcing cage is a polygonal shape.

[0010] Furthermore, the planar shape of the guide layer 1, the intermediate waterproof layer 2, the isolation layer 3, and the side of the reinforcing cage is V-shaped.

[0011] Preferably, the guide layer 1 is welded and fixed to the reinforcing cage.

[0012] Preferably, the guide layer 1 is made of a rigid material.

[0013] Furthermore, the guide layer 1 is a steel plate.

[0014] Preferably, the guide layer 1, the intermediate waterproof layer 2, and the isolation layer 3 are all at the same depth as the underground connecting wall.

[0015] Preferably, the material of the intermediate waterproof layer 2 is a water-impermeable material that expands upon contact with water.

[0016] Preferably, the material of the isolation layer 3 is a waterproof rigid or tough material.

[0017] Preferably, the connection structure consists of several separate tendons or bamboo skewers, and the material rigidity does not affect milling.

[0018] Preferably, the auxiliary device B has a grouting hole on its upper part.

[0019] A construction method for the combined sleeve milling joint device described in any one of the above claims includes the following steps:

[0020] S1. Proceed in sequence: construction preparation, surveying and setting out, guide wall construction, trench excavation, joint treatment, hole cleaning, hole cleaning and grout replacement;

[0021] S2, hoisting the steel cage and the combined milling joint device;

[0022] S3. Pour concrete, and at the same time pour low-dosage cement mortar into the milled area through the grouting hole.

[0023] S4. Milling is performed in the milling area. The auxiliary device and the isolation layer 3 are peeled off together. After the milling area is cleaned, the second-stage groove section is formed.

[0024] The beneficial effects of this invention are as follows:

[0025] 1) The joint device is equipped with an intermediate waterproof layer of water-stopping material, which can improve the water-stopping performance of the milling joint and enhance the impermeability of the underground connecting wall.

[0026] 2) The joint device is equipped with an irregularly shaped guide layer, which can help control the verticality of the trench section in the later stage, enhance the flatness of the ground wall, and the guide layer is in the shape of a zigzag line, which is beneficial to the shear resistance of the joint.

[0027] 3) The outermost layer of the joint device is equipped with an isolation layer. The isolation layer is integrated with the connection structure of the auxiliary device and is attached to the middle waterproof layer but not fixed. When milling is carried out in the milling area, the auxiliary device and the isolation layer are peeled off together, which can improve the flatness of the underground connection wall. Attached Figure Description

[0028] Figure 1 This is a plan view of the combined sleeve milling joint device of the present invention.

[0029] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0030] Figure 3 This is a schematic diagram of construction step S1 of the present invention.

[0031] Figure 4 This is a schematic diagram of construction step S2 of the present invention.

[0032] Figure 5 This is a schematic diagram of construction step S3 of the present invention.

[0033] Figure 6 This is a schematic diagram of construction step S4 of the present invention.

[0034] In the diagram, 1. guide layer, 2. intermediate waterproof layer, 3. isolation layer, 4. connection structure, 5. grouting hole; A. joint device, B. auxiliary device, C. milling area. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] See Figure 1-2 This modular joint device can be connected to a conventional reinforcing cage by welding.

[0037] See Figure 1-2 The combined joint device includes an irregularly shaped joint device A and an auxiliary device B. The auxiliary device B covers the milling area C of the joint; the joint device A is adjacent to the auxiliary device B and located on the side closer to the pre-grooved section, and the joint device A is strictly prohibited from encroaching on the milling area C.

[0038] The joint device A consists of three layers: an inner layer, a middle layer, and an outer layer. The auxiliary device includes a grouting hole 5 and a connecting structure 4. The outer layer of the joint device A is connected to the connecting structure of the auxiliary device B.

[0039] See Figure 1-2 The inner layer of the joint device A is the layer closest to the first constructed trench section, which is the guide layer 1; the middle layer is the waterproof layer 2; and the outer layer is the layer closest to the milling area (or the later constructed trench section), which is the isolation layer 3.

[0040] The function of the guide layer 1 in joint device A is to guide the verticality of the trench section after construction, reducing the possibility of unevenness of the ground wall in the vertical direction. The planar shape of the guide layer 1 is a polygonal line, which can be "V" shaped; its depth is the same as that of the ground wall. The constituent materials of the guide layer should have high rigidity and can be steel plates.

[0041] The function of intermediate layer 2 is to provide waterproofing and improve the water-stopping performance of the joint. Intermediate layer 2 has the same planar shape as the guide layer, the same depth as the floor wall, and should be effectively bonded to guide layer 1. The constituent materials of intermediate layer 2 should have strong water impermeability and can be water-swellable rubber.

[0042] The function of the isolation layer 3 is to prevent the intermediate layer 2 from connecting with other materials 4 in the milling area. The planar shape of the isolation layer 3 is the same as that of the guide layer 1, the depth is the same as that of the ground wall, and it is adjacent to the intermediate layer 2 but not bonded to it. The intermediate layer 2 should be connected to the connection structure 4 of the auxiliary device B, forming a whole. The constituent material of the isolation layer 3 should have a certain strength and water impermeability, and can be sheet metal.

[0043] See Figure 2 The function of the connecting structure 4 of the auxiliary device B is to ensure that the auxiliary device and the isolation layer can be connected as a whole, so that the auxiliary device and the isolation layer in the milling area can be quickly peeled off during the subsequent milling of the groove section. The connecting structure 4 can be several separate tendons or bamboo sticks, and the material rigidity should be small so as not to affect the milling of the gears of the washing machine.

[0044] See Figure 1-2 The function of grouting hole 5 is to grout the area where the auxiliary device is located (milling area C). The material to be poured only needs to have a certain strength and can be low-volume cement mortar.

[0045] During the actual construction, please follow these steps:

[0046] S1. Construction preparation → Surveying and setting out → Guide wall construction → Trench excavation → Joint treatment → Hole cleaning → Hole cleaning and slurry replacement.

[0047] S2, the steel cage hoist and the combined milling joint device of the present invention;

[0048] S3. Pour concrete, and at the same time pour low-dosage cement mortar into the milled area through the grouting hole.

[0049] S4. Milling of the joint area, peeling off of the auxiliary device and the isolation layer, and cleaning of the milled area followed by the formation of the second-stage groove.

[0050] The above are preferred embodiments of the present invention. Those skilled in the art can make various modifications or improvements based on these embodiments. Without departing from the overall concept of the present invention, such modifications or improvements should fall within the scope of protection claimed by the present invention.

Claims

1. A combined sleeve milling joint device, characterized in that: It includes a connector (A) and an auxiliary device (B); The joint device (A) includes a guide layer (1), an intermediate waterproof layer (2), and an isolation layer (3) in sequence; the inner side of the intermediate waterproof layer (2) is bonded to the guide layer (1); the isolation layer (3) is non-fixedly attached to the outer side of the intermediate waterproof layer (2); the guide layer (1) is used to be fixed to the side of the reinforcing cage in a conformal manner; The auxiliary device (B) is located on both sides of the reinforcing cage and covers the milling area. The gap between the milling area and the joint device (A) is greater than zero. The auxiliary device (B) has a connecting structure, which is connected to the isolation layer (3) to form an integral whole. The guide layer (1) is welded and fixed to the reinforcing cage; the guide layer (1) is a steel plate; The intermediate waterproof layer (2) is made of a water-impermeable, water-swellable material; The material of the isolation layer (3) is an impermeable rigid or tough material; The connection structure consists of several separate tendons or bamboo sticks, and the material rigidity does not affect milling. The auxiliary device (B) is provided with a grouting hole on its upper part.

2. The combined sleeve milling joint device as described in claim 1, characterized in that: The planar shape of the guide layer (1), the intermediate waterproof layer (2), the isolation layer (3), and the side of the steel cage is a polygonal shape.

3. The combined sleeve milling joint device as described in claim 2, characterized in that: The planar shape of the guide layer (1), the intermediate waterproof layer (2), the isolation layer (3), and the side of the steel cage is V-shaped.

4. The combined sleeve milling joint device as described in claim 1, characterized in that: The guide layer (1), intermediate waterproof layer (2), and isolation layer (3) are all at the same depth as the underground connecting wall.

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