A device and construction method for making a continuous caisson joint structure

Abstract

The present application relates to a kind of device and construction method for the manufacture of continuous caisson joint structure, adopt groove type water stop steel sheet, concave groove device, concave groove device is used to make well wall reserved concave groove, with the well wall main reinforcement of caisson and well wall reserved steel bar connector or dowel welding firm, and with caisson formwork composition whole, withstand the pressure when pouring concrete, groove type water stop steel sheet and water-swelling rubber strip combination setting in caisson reserved recess, play the role of retaining and sealing water stop, concave groove device is placed in joint reinforcement cage, and the pouring of joint cast-in-place concrete is poured.This application can play the role of connection and water stop by using the joint composed of groove type water stop steel sheet, water-swelling rubber strip, well wall reserved steel bar connector or dowel, concave groove device for making well wall reserved concave groove, joint reinforcement cage and joint cast-in-place concrete.This application can realize the rapid manufacture of continuous caisson joint, and has good water stop effect.

Description

Technical Field

[0001] This invention relates to a continuous caisson connection structure in the construction of large underground caisson structures, and more particularly to a device and construction method for fabricating continuous caisson joint structures. Background Technology

[0002] In recent years, the construction of large-scale underground structures has become increasingly common, such as large subway stations and large basement structures. Furthermore, the depth of these underground structures is increasing. Construction often utilizes caisson structures, but in the case of large-scale underground structures, a single caisson is often insufficient, requiring multiple consecutive caissons that are then connected and combined to form the underground structure. During construction, joints serve both connecting and waterproofing functions, and they also determine the quality of the project; therefore, the reliability of the joints is extremely important. Summary of the Invention

[0003] This invention proposes an apparatus and construction method for fabricating continuous caisson joint structures to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution of the present invention is: a device for fabricating a continuous caisson joint structure, comprising a grooved water-stop steel plate and a concave groove device. The concave groove device is used to create a pre-reserved concave groove in the caisson wall, which is welded firmly to the main reinforcement bars and pre-reserved reinforcement connectors or insert bars of the caisson wall, and forms an integral part with the caisson template to withstand the pressure during concrete pouring. The grooved water-stop steel plate is combined with a water-swellable rubber strip and set in the pre-reserved groove of the caisson to play the role of retaining soil and sealing water. The joint reinforcement cage is placed in the concave groove device, and the joint cast-in-place concrete is poured.

[0005] Furthermore, the web and flange of the grooved waterstop steel plate are made of steel with the same thickness and strength, and the thickness of the steel plate is determined according to the depth of the caisson sinking.

[0006] Furthermore, the concave groove device is made of steel, and the thickness and size of the steel plate are determined according to the depth of the caisson sinking and the pressure during concrete pouring.

[0007] A construction method for a continuous caisson joint structure, employing an apparatus for fabricating the continuous caisson joint structure, includes the following steps:

[0008] 1) Caisson construction, including pre-reserved concave grooves, rebar connectors or inserts, and pre-embedded steel components in the caisson wall;

[0009] 2) Fabrication of pre-reserved concave grooves in well walls: The pre-reserved concave grooves in well walls are fabricated using a steel concave groove device. The steel concave groove device is fixed by welding short steel bars to the main structural reinforcement. After the steel concave groove device is installed and fixed, concrete is poured, and water-stop rubber strips are installed in the pre-reserved concave grooves.

[0010] 3) Caisson construction: The caisson is a concrete caisson. The spacing between adjacent caissons should take into account the tilt and deviation during the sinking of the caisson. To prevent soil or other debris from entering the concave groove during the sinking process, steel core blocks can be filled into the groove and removed after sinking is completed.

[0011] 4) Construction of trough-shaped waterstop steel plate: The trough-shaped waterstop steel plate is made of prefabricated trough-shaped steel plate, or the steel plate is welded on site and then inserted into the reserved slot. The verticality must be ensured when inserting the trough-shaped waterstop steel plate.

[0012] 5) Excavate the soil between the caissons, insert the grooved water-stop steel plate, and then excavate the soil between the adjacent caissons. When excavating the soil, avoid damaging the caisson body.

[0013] 6) Erect the working platform and formwork, and weld steel pipes through the pre-embedded steel components on the adjacent well walls to support the working platform and steel formwork;

[0014] 7) Tie and lower the reinforcing cage and connect it with the reserved reinforcing bar connector or reserved dowel bar;

[0015] 8) After the steel reinforcement is tied, lowered, and connected, the steel formwork is erected and the joint concrete is poured.

[0016] 9) After the joint is completed and the concrete strength reaches the design requirements, the adjacent well walls are then removed to make the continuous caissons into a large caisson structure.

[0017] The beneficial effects of this invention are:

[0018] This invention employs a joint consisting of a grooved water-stopping steel plate, a water-swellable rubber strip, a pre-reserved steel bar connector or insert for the well wall, a concave groove device for creating a pre-reserved concave groove in the well wall, a joint steel cage, and a cast-in-place concrete joint, which can serve as a connection and water-stopping mechanism.

[0019] The connecting joint of the present invention can reliably connect two caissons into a whole and has a good water-stopping effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the continuous caisson joint structure of the present invention;

[0021] Figure 2 This is a detailed structural diagram of the device for fabricating continuous caisson joint structures according to the present invention;

[0022] Figure 3 This is a schematic diagram of the continuous caisson assembly structure of the present invention;

[0023] Figure 4 This is a detailed drawing of the grooved waterstop steel plate of the present invention;

[0024] Figure 5 This is a detailed drawing of the concave groove of the present invention;

[0025] Figure 6 This is a detailed drawing of the working platform and steel formwork support of the present invention;

[0026] Figure 7 This is a layout diagram of the pre-reserved steel components (working platform) in the well wall according to the present invention;

[0027] Figure 8 This is an installation diagram of the concave groove device for making pre-reserved concave grooves in well walls according to the present invention;

[0028] In the diagram: 1—groove-shaped water-stop steel plate; 2—water-swellable rubber strip; 3—concave groove device for making pre-reserved concave grooves in the well wall; 4—reserved steel bar connector or dowel bar in the well wall; 5—joint steel bar cage; 6—joint cast-in-place concrete; 7—caisson wall; 8—pre-reserved steel components; 9—working platform; 10—steel pipe support; 11—steel formwork; 12—welded short steel bars; 13—main reinforcement bars of the well wall; 14—stirrups and other steel bars. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 8 As shown, an apparatus for fabricating a continuous caisson joint structure includes a grooved water-stop steel plate 1, a water-swellable rubber strip 2, a pre-reserved steel bar connector or insert 4 for the well wall, a concave groove device for fabricating a pre-reserved concave groove in the well wall 3, a joint steel bar cage 5, and a cast-in-place concrete joint 6.

[0031] The concave groove device 3, used to create the pre-reserved concave groove in the well wall, is firmly welded to the main reinforcing bars 13 and the pre-reserved reinforcing bar connectors or dowel bars 4 of the well wall, and forms an integral part with the well formwork to withstand the pressure during concrete pouring. The grooved water-stop steel plate 1, combined with the water-swellable rubber strip 2, is installed in the pre-reserved groove of the well to serve as a retaining wall and a water-stopping seal. The joint reinforcing cage 5 is placed inside the concave groove device 3, and the joint cast-in-place concrete 6 is poured.

[0032] Preferably, the web and flange of the channel-shaped waterstop steel plate are made of steel with the same thickness and strength. The thickness of the steel plate should be determined according to the depth of the caisson sinking. The thickness should be 10mm to 20mm, and the length module of a single section should be 6m, 9m, or 12m.

[0033] Preferably, the concave groove device used to make the pre-reserved concave groove in the well wall is made of steel. The thickness and size of the steel plate should be determined according to the depth of the caisson sinking and the pressure when pouring concrete. The thickness of the steel plate should be 5mm to 10mm, the width of the groove should be 50mm to 150mm, the depth of the groove should be 150mm, and the width of the flanges on both sides of the groove should be 100mm to 200mm.

[0034] A construction method for a joint structure used in continuous caisson connection includes the following steps:

[0035] 1) Caisson construction. The caisson wall needs to have pre-reserved concave grooves, rebar connectors or dowel bars, and pre-embedded steel components. For adjacent caissons, the reinforcement of the caisson wall constructed later can be appropriately reduced.

[0036] 2) Fabrication of the pre-reserved concave groove in the well wall. The pre-reserved concave groove in the well wall is fabricated using a steel concave groove device. The steel concave groove device is fixed to the main structural reinforcement by welding short steel bars. After the steel concave groove device is installed and fixed, concrete is poured. Water-stop rubber strips are then installed inside the pre-reserved concave groove.

[0037] 3) Caisson construction. The caissons are concrete caissons, and the spacing between adjacent caissons should take into account the tilt and deviation during caisson sinking. To prevent soil or other debris from entering the concave trench during the caisson sinking process, long strip steel plates can be filled into the trench and removed after sinking is completed.

[0038] 4) Construction of the channel-shaped waterstop steel plate. The waterstop steel plate can be a prefabricated channel-shaped steel plate, or it can be inserted into a reserved slot after being welded on site. The verticality of the channel-shaped waterstop steel plate must be ensured when it is inserted.

[0039] 5) Soil removal between caissons. After the water-stop steel plate is inserted, the soil between adjacent caissons is removed. When removing the soil, care should be taken to avoid damaging the caisson body.

[0040] 6) Erect the working platform and formwork. Weld steel pipes to the pre-embedded steel components on the adjacent well walls to support the working platform and steel formwork.

[0041] 7) Tie and lower the steel cage and connect it with the reserved steel bar connector or reserved reinforcing bar.

[0042] 8) Pouring concrete. After the reinforcing bars are tied, lowered, and connected, steel formwork is erected and joint concrete is poured.

[0043] 9) After the joint is completed (the concrete strength must meet the design requirements), the adjacent well walls are then cut off to make the continuous caissons a large caisson structure.

Claims

1. A construction method for a continuous caisson joint structure, using a device for making a continuous caisson joint structure, the device comprising a groove-type water-stop steel plate, a concave groove device for making a caisson wall reserved concave groove, firmly welded with the caisson wall main reinforcement and caisson wall reserved steel bar adapter or dowel, and integrated with the caisson formwork to bear the pressure when pouring concrete, the groove-type water-stop steel plate is combined with a water-swelling rubber strip in the caisson reserved groove to play the role of soil retaining and sealing water stop, the concave groove device places a joint reinforcement cage and pours joint cast-in-place concrete, characterized in that, The method comprises the following steps: (1) caisson manufacturing, caisson wall reserved concave groove, steel bar connector or reinforcing bar, embedded steel member; (2) caisson wall reserved concave groove manufacturing, caisson wall reserved concave groove is manufactured through steel concave groove device, steel concave groove device is fixed through welding of short steel bars and structural main reinforcement, after completion of installation and fixation of the steel concave groove device, concrete is poured, and a water stop rubber strip is installed in the reserved concave groove; (3) caisson construction, the caisson is a concrete caisson, the interval distance between adjacent caissons should consider the inclination and deviation during sinking of the caisson, in order to prevent soil or other sundries from entering the concave groove during sinking of the caisson, steel core blocks are filled in the groove, and the steel core blocks are extracted after completion of sinking; (4) groove type water stop steel plate construction, the groove type water stop steel plate is a prefabricated steel plate with a groove, or is inserted into the reserved slot after welding of the steel plate on site, the groove type water stop steel plate needs to be ensured vertical when being inserted; (5) soil excavation between caissons, the soil between adjacent caissons is excavated after insertion of the groove type water stop steel plate, the caisson body should be avoided to be damaged when the soil is excavated; (6) erection of operation platform and formwork, steel pipes are welded through embedded steel members on adjacent caisson walls, as support of the operation platform and steel formwork; (7) binding and lowering of steel reinforcement cage and connection with the reserved steel bar connector or reserved reinforcing bar; (8) pouring of concrete, after completion of steel reinforcement binding, lowering and connection, the steel formwork is supported and joint concrete is poured; (9) after completion of the joint, the concrete strength reaches the design requirement, the adjacent caisson walls are cut off, so that the continuous caissons become a large caisson structure.

2. The method for construction of a continuous caisson joint structure according to claim 1, characterized by: The web plate and the flange plate of the groove type water stop steel plate adopt the same thickness and the same strength steel, and the thickness of the steel plate is determined according to the sinking depth of the caisson.

3. The method for construction of a continuous caisson joint structure according to claim 1, characterized in that: The concave groove device is made of steel, and the thickness and size of the steel plate are determined according to the sinking depth of the caisson and the pressure during pouring of the concrete.

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