Rigid-flexible combined template type joint device for underground diaphragm wall and construction method

Abstract

The invention discloses an underground diaphragm wall rigid-flexible combined formwork type connector device and a construction method, and the underground diaphragm wall rigid-flexible combined formwork type connector device comprises a rigid connector body and a high-strength flexible capsule body which is connected to the side edge of the rigid connector body and can be inflated and retracted; an existing connector device is improved, a rigid-flexible combination device of a steel structure rigid connector pipe body with a super-hydrophobic non-stick coating and a flexible high-strength fiber capsule is adopted to serve as a circular connector formwork in the underground diaphragm wall pouring process, the flushing pressure in the capsule is controlled in the pouring process, and after pouring is completed and top concrete is initially set, the flexible high-strength fiber capsule is formed. Controlling the shrinkage high-strength capsule to cling to the joint pipe, and then sequentially pulling out the joint pipe joints; according to the method, the pouring speed of the underground diaphragm wall is not limited, the pouring quality can be better guaranteed, the process is simple and easy to control, and the process guarantee degree is high.

Description

Technical Field

[0001] This invention relates to the fields of engineering technology such as water conservancy and hydropower, transportation and ports, and municipal engineering, and more specifically to a rigid-flexible combined formwork joint device and construction method for underground continuous wall. Background Technology

[0002] Diaphragm walls are an important technology for underground seepage prevention in hydropower projects and deep foundation pits in cities. Diaphragm walls are constructed in units, and there are various joint types for the joints of diaphragm wall units. Among them, the circular joint pull-out method uses the slipform principle to construct a semi-circular joint, which increases the seepage diameter of the joint and saves concrete and is therefore widely used.

[0003] With the increasing design depth of underground continuous walls, especially anti-seepage walls in major river hydropower projects in China, the drawbacks of the current circular joint pipe pulling method have become apparent. The main problem is that the volume of concrete being poured is getting larger and larger. In order to meet the design requirements of concrete, admixtures such as fly ash are added, and the initial setting time of concrete exceeds 9 hours. In addition, there are certain restrictions on the burial depth of pipe pulling. The pulling speed of the joint pipe must be coordinated and matched with the pouring speed of the concrete slurry. The limited pouring speed makes the pouring time of each unit longer and longer, which correspondingly increases the risk of pipe sticking to the concrete. Summary of the Invention

[0004] In view of this, the present invention provides a rigid-flexible combined formwork joint device and construction method for underground continuous wall, aiming to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A rigid-flexible template-type joint device for underground continuous wall includes a rigid joint body and a high-strength flexible capsule body that can be inflated and retracted and connected to the side of the rigid joint body.

[0006] Preferably, there are two high-strength flexible capsules, and the two high-strength flexible capsules are symmetrically bonded to the side of the rigid joint body.

[0007] Preferably, the rigid joint body is a hollow structure, and the rigid joint body includes an arc-shaped plate and two connecting plates that are connected to the arc-shaped plate and are symmetrically arranged with each other. The two connecting plates are respectively connected to the two high-strength flexible capsule bodies.

[0008] Preferably, the high-strength flexible capsule body includes a flexible capsule component and a rigid perforated tube that penetrates the flexible capsule component and communicates with the interior of the flexible capsule component.

[0009] Preferably, it also includes a support body, which is fixedly connected inside the rigid joint body. Both ends of the longitudinal support member of the support body protrude from the side of the rigid joint body to form a pull-out force-bearing port.

[0010] Preferably, rubber baffles are fixedly connected to both ends of the longitudinal support member.

[0011] Preferably, multiple hydraulic lifting ports are provided at intervals on both ends of the longitudinal support member.

[0012] Preferably, the outer surface of the arc-shaped plate and both end faces of the longitudinal support are coated with a hydrophobic nano-coating.

[0013] This invention provides a construction method for a rigid-flexible combined formwork joint device for underground diaphragm walls, comprising the following steps: S1. After cleaning and replacing the grout in the underground continuous wall, the connection of the rigid-flexible joint device of the upper and lower sections of the underground continuous wall is completed, and the airtightness of the flexible capsule is quickly tested. At the same time, the rubber diaphragm is bonded between the upper and lower flexible capsules, and the rigid-flexible joint device of the underground continuous wall is installed in sections. S2. After the rigid-flexible joint device for the underground continuous wall is installed to the bottom of the hole, water is gradually filled into the flexible capsule through the rigid perforated pipe from the hole opening. S3. A concrete pouring guide pipe is installed below. During the concrete pouring process, the internal pressure of the flexible capsule is adjusted to balance the lateral pressure of the mud and the flowing concrete on the outside. S4. After the concrete is poured to the top and has initially set, a water pumping pipe is installed under the rigid perforated pipe to pump out the water from the flexible capsule, thereby achieving the retraction of the flexible capsule. S5. The rigid-flexible formwork joint device of the underground continuous wall is pulled out in sections by the joint pipe pulling device to realize the demolding of the rigid-flexible formwork joint device of the underground continuous wall and the concrete of the continuous wall. After the excavation, clearing and pouring of the adjacent underground continuous wall trench section is completed, the semi-circular joint of the underground continuous wall unit is constructed.

[0014] Preferably, the connection method of the rigid-flexible combined template joint device for the upper and lower sections of the underground continuous wall is as follows: the upper and lower rigid joint bodies are adapted by a concave-convex structure and fastened by multiple tapered bolts; the ends of the rigid joint bodies are provided with fixing plates, and the flexible capsule components are fixed by the fixing plates; the upper and lower ends of the rigid perforated pipes are provided with perforated pipe sealing and fixing ends, and the upper and lower rigid perforated pipes are connected in series with a quick connector to achieve joint sealing.

[0015] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a rigid-flexible combined formwork joint device and construction method for underground continuous wall, which has the following beneficial effects: This invention improves upon existing joint devices by employing a rigid steel joint pipe with a super-hydrophobic, non-stick coating and a flexible, high-strength fiber capsule as a combined rigid-flexible device for the diaphragm wall casting process. During casting, the internal water pressure of the capsule is controlled. After the top concrete has initially set, the shrinkage of the high-strength capsule is controlled to adhere tightly to the joint pipe, and then the joint pipe sections are sequentially pulled out. This method does not limit the casting speed of the diaphragm wall, better ensures casting quality, and is simple, easy to control, and offers high process assurance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 The attached figure is a schematic diagram of the overall structure of the rigid-flexible combined template joint device for underground continuous wall provided by the present invention. Figure 2 The attached figure is a schematic diagram of the hydraulic lifting port structure provided by the present invention; in: 1. Rigid joint body; 2. High-strength flexible capsule body; 3. Arc plate; 4. Connecting plate; 5. Flexible capsule component; 6. Rigid perforated tube; 7. Support body; 8. Longitudinal support component; 9. Pulling force port; 10. Rubber baffle; 11. Hydraulic pull-out port; 12. Hydrophobic nano-coating. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] See Figure 1-2 This invention discloses a rigid-flexible joint device for underground continuous wall, comprising a rigid joint body 1 and a high-strength flexible capsule body 2 connected to the side of the rigid joint body 1, which can be inflated and retracted; the number of high-strength flexible capsule bodies 2 is two, and the two high-strength flexible capsule bodies 2 are symmetrically bonded to the side of the rigid joint body 1.

[0020] In this embodiment, the rigid joint body 1 is a hollow structure. The rigid joint body 1 includes an arc-shaped plate 3 and two connecting plates 4 that are connected to the arc-shaped plate 3 and are symmetrically arranged with each other. The two connecting plates 4 are respectively connected to two high-strength flexible capsule bodies 2.

[0021] The rigid joint body 1 is a hollow steel structure. The concrete side of the underground continuous wall unit is an arc plate 3, which is semi-circular or approximately semi-circular. The other side is a connecting plate 4. The two connecting plates 4 are symmetrically arranged to form a front-to-back symmetrical triangular structure. The middle of the rigid joint body 1 is a lifting support body 7, which realizes the lateral formwork support function and the structural function of lifting up and down. The two connecting plates 4 are respectively bonded or riveted to the two high-strength flexible capsule bodies 2.

[0022] To further optimize the above technical solution, the high-strength flexible capsule body 2 includes a flexible capsule component 5 and a rigid perforated tube 6 that penetrates the flexible capsule component 5 and communicates with the interior of the flexible capsule component 5.

[0023] The flexible capsule 5 is slightly longer than the single-section rigid connector 1. The rigid perforated tube 6 runs through the middle of the flexible capsule 5. The upper and lower ends of the rigid perforated tube 6 are provided with perforated tube sealing and fixing ends. The rigid perforated tube 6 has multiple through holes on the tube body inside the flexible capsule 5. When filling with water, it is filled into the flexible capsule 5 through the through holes.

[0024] To further optimize the above technical solution, a support body 7 is also included. The support body 7 is fixedly connected inside the rigid joint body 1. Both ends of the longitudinal support member 8 of the support body 7 protrude from the side of the rigid joint body 1, forming a lifting force port 9. The support body 7 realizes the function of lateral template support and the structural function of vertical lifting. The support body 7 includes multiple transverse support members and longitudinal support members 8. Both ends of the longitudinal support member 8 protrude from the side of the rigid joint body 1, forming a lifting force port 9, which, in conjunction with the corresponding hydraulic lifting machine, realizes the lifting of the joint device. Multiple hydraulic lifting ports 11 are provided at equal intervals on both ends of the longitudinal support member 8, which are used as the force points for the hydraulic lifting device's locking key.

[0025] To further optimize the above technical solution, rubber baffles 10 are fixedly connected to both ends of the longitudinal support member 8. Rubber baffles 10 are riveted to both ends of the longitudinal support member 8 near the flexible capsule member 5 to restrict the flow of concrete around the flexible capsule member 5 after it is inflated.

[0026] To further optimize the above technical solution, multiple hydraulic lifting ports 11 are provided at intervals on both ends of the longitudinal support member 8.

[0027] To further optimize the above technical solution, the outer surface of the arc plate 3 and both ends of the longitudinal support member 8 are coated with a hydrophobic nano-coating 12.

[0028] This invention provides a construction method for a rigid-flexible combined formwork joint device for underground diaphragm walls, comprising the following steps: S1. After cleaning and replacing the grout in the underground continuous wall, the connection of the rigid-flexible joint device of the upper and lower sections of the underground continuous wall is completed, and the air tightness of the flexible capsule 5 is quickly tested. At the same time, the rubber diaphragm is bonded between the upper and lower flexible capsule 5 sections, and the rigid-flexible joint device of the underground continuous wall is installed in sections. S2. After the rigid-flexible joint device of the underground continuous wall is installed at the bottom of the hole, water is gradually filled into the flexible capsule 5 through the rigid perforated pipe 6 from the hole opening, so that the water pressure balances the mud pressure on the capsule.

[0029] S3. A concrete pouring guide pipe is installed below. During the concrete pouring process, the internal pressure of the flexible capsule 5 is adjusted to balance the lateral pressure of the mud and flowing concrete on the outside. The internal pressure of the flexible capsule 5 is adjusted by a water pressure pump to achieve a rough balance of forces between the flexible capsule 5, the poured concrete, and the upper mud, so as to avoid large movement of the joint device.

[0030] S4. After the concrete is poured to the top and has initially set, a water pumping pipe is installed under the rigid flower pipe 6 to pump out the water from the flexible capsule 5, thereby achieving the retraction of the flexible capsule 5. S5. The rigid-flexible formwork joint device of the underground continuous wall is pulled out in sections by the joint pipe pulling device to realize the demolding of the rigid-flexible formwork joint device of the underground continuous wall and the concrete of the continuous wall. After the excavation, clearing and pouring of the adjacent underground continuous wall trench section is completed, the semi-circular joint of the underground continuous wall unit is constructed.

[0031] Before construction begins, based on the depth and thickness of the diaphragm wall, a rigid-flexible combined template joint device for the diaphragm wall is fabricated in the factory, along with a corresponding hydraulic lifting machine and power hydraulic station for pulling out the wall.

[0032] At the bottom of the lowest section of the rigid-flexible joint device for the diaphragm wall, an expansion capsule is attached. The rigid perforated pipe 6 is connected to the expansion capsule. Water is filled into the expansion capsule to make it expand, which facilitates the lifting and demolding of the rigid-flexible joint device for the diaphragm wall.

[0033] In step S1, an adhesive rubber diaphragm is provided between the upper and lower flexible capsule components 5 to cover the flexible capsule component 5, preventing concrete from flowing around and entering the connection part.

[0034] In this embodiment, the connection method of the rigid-flexible joint device of the upper and lower sections of the underground continuous wall is as follows: the upper and lower rigid joint bodies 1 are adapted by the concave and convex structure and fastened by multiple tapered bolts; the end of the rigid joint body 1 is provided with a fixing plate, and the flexible capsule 5 is fixed by the fixing plate; the upper and lower ends of the rigid perforated tube 6 are provided with perforated tube sealing and fixing ends, and the upper and lower sections of rigid perforated tube 6 are connected in series with a quick connector to achieve joint sealing.

[0035] In step S3, the pressure inside the flexible capsule 5 is adjusted. The principle of capsule pressure control is that the lateral pressure of the joint pipe at the lowest point of the concrete flow state in the slot is balanced with the capsule pressure on the other side. Based on the above principle, the control pressure of capsule flushing can be calculated and precisely controlled by a small pressure water pump during the pouring process.

[0036] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rigid-flexible combined formwork joint device for underground continuous wall, characterized in that, It includes a rigid connector body and a high-strength, flexible capsule body that can be inflated and retracted and connected to the side of the rigid connector body.

2. The rigid-flexible combined formwork joint device for underground continuous wall according to claim 1, characterized in that, The number of high-strength flexible capsules is two, and the two high-strength flexible capsules are symmetrically bonded to the side of the rigid joint body.

3. The rigid-flexible combined formwork joint device for underground continuous wall according to claim 2, characterized in that, The rigid joint body is a hollow structure. The rigid joint body includes an arc-shaped plate and two connecting plates that are connected to the arc-shaped plate and are symmetrically arranged with each other. The two connecting plates are respectively connected to the two high-strength flexible capsule bodies.

4. The rigid-flexible combined formwork joint device for underground continuous wall according to claim 1, characterized in that, The high-strength flexible capsule body includes a flexible capsule component and a rigid perforated tube that penetrates the flexible capsule component and communicates with the interior of the flexible capsule component.

5. A rigid-flexible combined formwork joint device for underground continuous wall according to claim 3, characterized in that, It also includes a support body, which is fixedly connected inside the rigid joint body. Both ends of the longitudinal support member of the support body protrude from the side of the rigid joint body to form a pull-out force-bearing port.

6. A rigid-flexible combined formwork joint device for underground diaphragm walls according to claim 5, characterized in that, Both ends of the longitudinal support are fixedly connected with rubber baffles.

7. A rigid-flexible combined formwork joint device for underground continuous wall according to claim 5, characterized in that, Multiple hydraulic lifting ports are spaced apart on both ends of the longitudinal support member.

8. A rigid-flexible combined formwork joint device for underground continuous wall according to claim 5, characterized in that, The outer surface of the arc-shaped plate and both end faces of the longitudinal support are coated with a hydrophobic nano-coating.

9. A construction method for a rigid-flexible combined formwork joint device for underground continuous wall, characterized in that, Includes the following steps: S1. After cleaning and replacing the grout in the underground continuous wall, the connection of the rigid-flexible joint device of the upper and lower sections of the underground continuous wall is completed, and the airtightness of the flexible capsule is quickly tested. At the same time, the rubber diaphragm is bonded between the upper and lower flexible capsules, and the rigid-flexible joint device of the underground continuous wall is installed in sections. S2. After the rigid-flexible joint device for the underground continuous wall is installed to the bottom of the hole, water is gradually filled into the flexible capsule through the rigid perforated pipe from the hole opening. S3. A concrete pouring guide pipe is installed below. During the concrete pouring process, the internal pressure of the flexible capsule is adjusted to balance the lateral pressure of the mud and the flowing concrete on the outside. S4. After the concrete is poured to the top and has initially set, a water pumping pipe is installed under the rigid perforated pipe to pump out the water from the flexible capsule, thereby achieving the retraction of the flexible capsule. S5. The rigid-flexible formwork joint device of the underground continuous wall is pulled out in sections by the joint pipe pulling device to realize the demolding of the rigid-flexible formwork joint device of the underground continuous wall and the concrete of the continuous wall. After the excavation, clearing and pouring of the adjacent underground continuous wall trench section is completed, the semi-circular joint of the underground continuous wall unit is constructed.

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