CN216712992U - Prefabricated-cast-in-place underground continuous wall structure based on BIM technology - Google Patents

Abstract

The utility model discloses a prefabricated-cast-in-situ underground continuous wall structure based on BIM technology, comprising a prefabricated wall and a cast-in-situ concrete wall; the prefabricated wall and the cast-in-place concrete wall are overlapped with each other in sequence to form a continuous wall; The walls of the cast-in-place concrete walls are respectively provided with steel supports for underground lateral reinforcement; the tops of the prefabricated walls and the cast-in-place concrete walls are capped with continuous reinforced concrete crown beams. The underground diaphragm wall structure combines the advantages of the cast-in-situ diaphragm wall and the prefabricated diaphragm wall to solve the problem of the long construction period of the cast-in-place diaphragm wall for the foundation pit support of the tunnel engineering in the transportation field, the concrete flow around the joint, and the stability of the groove wall. Insufficient and too many prefabricated underground diaphragm wall joints, poor waterproof and impermeability and other problems.

Description

A prefabricated-cast-in-place underground diaphragm wall structure based on BIM technology

technical field

The utility model belongs to the field of traffic infrastructure, in particular to a prefabricated-cast-in-place underground continuous wall structure based on BIM technology.

Background technique

Building Information Modeling (BIM) is a new tool for transportation engineering, architectural engineering and civil engineering. The core of BIM is to establish a virtual three-dimensional model and use digital technology to provide a complete component model information database consistent with the actual situation for this model. BIM technology can digitize the entire process of construction, management and operation of transportation infrastructure. In the context of transportation informatization, BIM technology is an important means to realize the digital transformation and intelligent upgrade of transportation infrastructure.

In recent years, the application of underground diaphragm walls in the support of complex and low-quality tunnel foundation pits has become more and more extensive, and various construction methods have also been widely developed, becoming an important technical means for the construction of transportation infrastructure projects. At present, most of the underground diaphragm walls are still using the cast-in-place construction technology, which has problems such as long construction period, large impact on the surrounding environment, and insufficient stability of the groove wall. As the concept of prefabrication and assembly is introduced into the construction technology of the underground diaphragm wall, once the prefabricated underground diaphragm wall comes out, it has a great construction advantage, improves the quality of the wall, shortens the construction time on site, and reduces the phenomenon of concrete bypass. At the same time, due to the limitation of hoisting and transportation capacity of prefabricated underground diaphragm walls, the length and width of each wall should not be too large, which will lead to excessive use of joints, and it is also prone to quality problems in terms of waterproof and impermeability. . Therefore, how to use a new type of underground diaphragm wall structure that takes into account the advantages of the first two types of underground diaphragm walls to support tunnel engineering foundation pits under relatively complex geological conditions is a technical problem that needs to be solved urgently.

Utility model content

The technical problem to be solved by the utility model is to provide a new type of underground continuous wall structure in view of the deficiencies of the existing technology, which can combine the advantages of the cast-in-place underground continuous wall and the prefabricated underground continuous wall to solve the foundation pit support of the tunnel engineering in the traffic field. The construction period of the cast-in-place diaphragm wall is long, the concrete flow around the joint, the lack of stability of the groove wall, the excessive joints of the prefabricated diaphragm wall, and the poor waterproof and impermeability.

In order to achieve the above object, the technical scheme adopted by the present utility model is as follows:

A prefabricated-in-situ continuous wall structure based on BIM technology, including prefabricated walls and in-situ concrete walls; the prefabricated walls and the in-situ concrete walls are overlapped with each other in sequence to form a continuous wall; The walls are respectively provided with steel supports for underground lateral reinforcement; the tops of prefabricated walls and cast-in-place concrete walls are capped with continuous reinforced concrete crown beams.

Specifically, the prefabricated wall adopts a box-shaped structure, and the cross-section is a double-box cross-section with notches on both sides, and the notch on both sides is spliced with the cast-in-place concrete wall.

Specifically, the prefabricated wall is formed by splicing two or more prefabricated walls up and down; the upper and lower ends of each wall are respectively provided with connection joints, and the upper and lower walls are spliced and fixed through the connection joints.

Preferably, the connecting joints include erection bars, distribution bars and longitudinal stress bars; the erection bars enclose a rectangular box structure, and the distribution bars are located at the four corners of the erection bars to form notches on both sides , and the stressed tendons are distributed on the erecting tendons and the distribution tendons along the longitudinal direction.

Preferably, the connection joints of the upper and lower prefabricated walls are connected by flanged joints and fixed by high-strength bolts.

Further, the connection joints at the top of the prefabricated wall are also prefabricated with hanging points, and the prefabricated wall is moved into the ground by fixing the hanging points by a crane to complete the installation.

Specifically, the cast-in-place concrete wall adopts a straight-line steel cage skeleton, which is formed by pouring concrete after hoisting the steel cage skeleton to both sides of the underground prefabricated wall; a set of steel cage hanging points are provided on the steel cage skeleton.

Preferably, the steel cage hanging point includes a steel plate with a hanging hole at the top, and the steel plate is welded and fixed to the main reinforcement of the steel cage; two anchor bars are fixed on both sides of the steel plate by a set of studs; the anchor bars are Hook-shaped, respectively used to hook the steel cage frame.

Beneficial effects:

The utility model is a new construction technology based on the cast-in-place-prefabricated underground continuous wall construction technology based on the BIM technology, and combines the advantages of the cast-in-place underground continuous wall and the prefabricated underground continuous wall. The use of prefabricated underground diaphragm wall sections can achieve the purpose of improving construction efficiency, reducing construction period, and improving wall quality; in the prefabrication of prefabricated underground diaphragm walls, structural embedded parts can be accurately embedded to improve construction accuracy; prefabricated underground continuous walls The two ends of the wall are provided with notches, and the notches can be fully utilized during the construction of the cast-in-place underground continuous wall. Compared with the construction method in which the cast-in-place joints of the prefabricated diaphragm walls are placed next to each other, the construction method of the cast-in-place-prefabricated diaphragm walls adopts the construction method of the cast-in-place diaphragm walls between the wall joints of the adjacent prefabricated diaphragm walls at both ends. The existence of the cast-in-situ underground continuous wall can increase the integrity of the ground connecting wall and improve the overall structural performance of the ground connecting wall, and the structural performance of the cast-in-place reinforced concrete at the structural connection is better. Using BIM technology to model the cast-in-place-prefabricated diaphragm wall structure with high precision, it has the function of efficient visualization, which is convenient for zero-based workers to quickly understand the diaphragm wall structure and improve work efficiency.

Description of drawings

The present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the above-mentioned and/or other aspects of the present utility model will become clearer.

Figure 1 is a schematic diagram of the overall structure of the prefabricated-cast-in-situ underground diaphragm wall.

Figure 2 is a splicing structure diagram of a prefabricated wall and a cast-in-place concrete wall.

Figure 3 is a schematic structural diagram of the prefabricated wall splicing up and down.

Figure 4 is a schematic diagram of the reinforcement structure of the connecting joint.

Figure 5 is a schematic diagram of the connection of the connection joint.

Figure 6 is a schematic diagram of the structure of the steel cage hanging point.

Wherein, each reference sign represents:

1 prefabricated wall; 11 connecting joints; 111 stand bars; 112 distribution bars; 113 longitudinal reinforcement bars; 12 notches; 13 high-strength bolts; 14 lifting points; 2 cast-in-place concrete walls; studs; 24 anchor bars; 3 steel bracing; 4 reinforced concrete crown beams.

Detailed ways

The present invention can be better understood according to the following examples.

The structures, proportions, sizes, etc. shown in the accompanying drawings in the description are only used to cooperate with the contents disclosed in the description for the understanding and reading of those who are familiar with the technology, and are not used to limit the conditions for the implementation of the present invention. Therefore, Without technical substantive significance, any modification of structure, change of proportional relationship or adjustment of size should still fall within the scope disclosed in the present utility model without affecting the effect that the utility model can produce and the purpose that can be achieved. within the scope of the technical content. At the same time, terms such as "upper", "lower", "front", "back", "middle", etc. quoted in this specification are only for the convenience of description and clarity, and are not used to limit the implementation of the present invention. The change or adjustment of the scope and its relative relationship shall also be regarded as the applicable scope of the present invention without substantially changing the technical content.

As shown in Figure 1, the prefabricated-cast-in-situ diaphragm wall structure based on BIM technology adopts a new process of alternating between prefabricated diaphragm walls and cast-in-place diaphragm walls. The walls on both sides of the section respectively contain 2 pieces), the prefabricated underground diaphragm wall is 21.2m deep, 2.4m wide, 0.76m thick and 800mm wide. It includes a prefabricated wall 1 and a cast-in-place concrete wall 2; the prefabricated wall 1 and the cast-in-place concrete wall 2 are overlapped with each other at intervals to form a continuous wall. In order to ensure the stability of the wall in the embodiment and make the bearing capacity meet the requirements, the wall surfaces of the prefabricated wall 1 and the cast-in-place concrete wall 2 are respectively provided with steel supports 3 for underground lateral reinforcement. The tops of prefabricated walls 1 and cast-in-place concrete walls 2 are capped with continuous reinforced concrete crown beams 4.

As shown in FIG. 2 , the prefabricated wall 1 adopts a box-shaped structure, and the cross-section is a double-box cross-section with notches 12 on both sides.

As shown in Figure 3, the prefabricated wall 1 is composed of two or more prefabricated walls spliced up and down, the upper section is 12m long, the lower section is 9.2m long, 2.4m wide, and 0.76m thick; the upper and lower ends of each section of the wall are respectively provided with The connecting joint 11 is used to splicing and fixing the upper and lower sections of the wall through the connecting joint 11 .

As shown in FIG. 4 , the connecting joint 11 includes erecting ribs 111 , distribution ribs 112 and longitudinal stress ribs 113 ; the erecting ribs 111 enclose a rectangular box structure, and the distribution ribs 112 are located at the four corners of the erecting ribs 111 . For forming the notches 12 on both sides, the stressed ribs 113 are longitudinally distributed on the erecting ribs 111 and the distribution ribs 112 .

As shown in FIG. 5 , the connection joints 11 of the upper and lower prefabricated walls are connected by flanged joints and fixed by high-strength bolts 13 .

As shown in FIG. 3 , the connecting joint 11 at the top of the prefabricated wall is also prefabricated with a hoisting point 14 , and the hoisting point 14 is fixed by a crane to move the prefabricated wall into the ground to complete the installation. The prefabricated underground diaphragm wall is hoisted by double machines and returned straight in the air. The hoisting sequence is: first hoist the 9.2m lower section of the prefabricated underground diaphragm wall, and then hoist the 12m section of the prefabricated underground diaphragm wall. After the lower section of the underground diaphragm wall is placed in the groove, it is temporarily fixed on the temporary fixing bracket erected on the ground of the groove. Then, according to the above hoisting construction operation, hoist the upper 12m wall section. After the upper section wall section and the lower section wall section are accurately aligned, install high-strength bolts to connect the upper and lower section joints. Release the temporary fixation, put the whole prefabricated underground diaphragm wall into the slot, and then fix it. The prefabricated underground continuous wall and the lower sub-sections are connected by flanged joints and high-strength bolts, and a total of 24 joints are arranged on both sides.

The cast-in-place concrete wall 2 adopts a straight-line steel cage skeleton, with a length of 20.55m and a width of 6m. After the reinforced cage frame is hoisted to both sides of the underground prefabricated wall 1, concrete is poured to form. The reinforcement cage is provided with two horizontal hoisting points, 4 vertical hoisting points, 2 main hoisting points and 2 auxiliary hoisting points. A set of steel cage hanging points are arranged on the steel cage skeleton.

As shown in FIG. 6 , the lifting point of the steel cage includes a steel plate 22 with a lifting hole at the top, and the steel plate 22 is welded and fixed with the main reinforcement 21 of the steel cage; two anchor bars are fixed on both sides of the steel plate 22 through a set of studs 24 24; the anchor bars 24 are hook-shaped and are respectively used to hook the reinforcement cage frame.

During the hoisting process of the reinforcement cage, in addition to the reasonable setting of the lifting points, the reinforcement cage still needs to be reinforced in a targeted manner, mainly including the vertical and horizontal truss bars in the ordinary reinforcement cage, the diagonal reinforcement in the L-shaped reinforcement cage and the location of the lifting point. reinforcement. The main purpose of arranging the reinforcement is to increase the rigidity and strength of the steel cage when it is hoisted, so as to minimize the deformation during the hoisting process. Corresponding reinforcement treatment should also be carried out on the position of the lifting point of the steel cage to prevent the lifting point from being de-welded due to the local stress concentration caused by the change of the force direction during the lifting process.

After the hoisting of the steel cage is completed, the concrete pouring of the cast-in-place section begins. The cement concrete used for the cast-in-place underground diaphragm wall in this example is C35 grade. After the tank cleaning is completed and the mud is checked and qualified, the cement concrete will be poured within 4 hours.

When pouring the cement concrete, all the recovered mud in the tank section is drawn back to the mud pool. After sedimentation and treatment, those that meet the requirements will continue to be used, and those that do not meet the requirements will be discarded according to regulations.

The present utility model provides a thought and method for a prefabricated-cast-in-place underground diaphragm wall structure based on BIM technology. There are many specific methods and approaches for realizing the technical solution. The above are only the preferred embodiments of the present utility model. It should be pointed out that , for those skilled in the art, under the premise of not departing from the principle of the present utility model, several improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model. All components not specified in this embodiment can be implemented by existing technologies.

Claims (8)

1. A prefabricated-cast-in-situ diaphragm wall structure based on BIM technology, characterized in that it comprises a prefabricated wall (1) and a cast-in-place concrete wall (2); the prefabricated wall (1) and the cast-in-place concrete wall (2) ) are overlapped with each other at intervals to form a continuous wall; the wall surfaces of the prefabricated wall (1) and the cast-in-place concrete wall (2) are respectively provided with steel supports (3) for underground lateral reinforcement; the prefabricated wall (1) and the cast-in-place concrete wall (2) The top is capped with a continuous reinforced concrete crown beam (4). 2. The prefabricated-cast-in-place underground diaphragm wall structure based on BIM technology according to claim 1, wherein the prefabricated wall (1) adopts a box-shaped structure, and the cross-section is a double-box cross-section with notches on both sides. (12), splicing with the cast-in-place concrete wall (2) through the notches (12) on both sides. 3. The prefabricated-cast-in-place underground diaphragm wall structure based on BIM technology according to claim 2, wherein the prefabricated wall (1) is formed by splicing two or more prefabricated walls up and down; The upper and lower ends of the wall are respectively provided with connecting joints (11), and the upper and lower sections of the wall are spliced and fixed through the connecting joints (11). 4. The prefabricated-cast-in-place underground diaphragm wall structure based on BIM technology according to claim 3, wherein the connecting joint (11) comprises erection bars (111) and distribution bars (112) and longitudinal stress Ribs (113); the erection ribs (111) enclose a rectangular box structure, the distribution ribs (112) are located at the four corners of the erection ribs (111), and are used to form notches (12) on both sides, the The stressed ribs (113) are longitudinally distributed on the erecting ribs (111) and the distribution ribs (112). 5. The prefabricated-cast-in-place underground diaphragm wall structure based on BIM technology according to claim 3, characterized in that the connection joints (11) of the upper and lower prefabricated walls are connected by flanged joints, and high-strength Bolt (13) to fix it. 6. The prefabricated-cast-in-place underground diaphragm wall structure based on BIM technology according to claim 3, wherein the connecting joint (11) at the top of the prefabricated wall body is also prefabricated with a hoisting point (14), which is passed through a hoist. The fixed lifting point (14) moves the prefabricated wall into the ground to complete the installation. 7. The prefabricated-cast-in-situ underground diaphragm wall structure based on BIM technology according to claim 1, wherein the cast-in-place concrete wall (2) adopts an in-line steel cage frame, and the steel cage frame is hoisted to the ground After the two sides of the prefabricated wall (1), the concrete is poured to form; the steel cage skeleton is provided with a group of steel cage hanging points. 8. The prefabricated-cast-in-place underground diaphragm wall structure based on BIM technology according to claim 7, characterized in that, the steel cage hanging point comprises a steel plate (22) with a hanging hole at the top, and the steel plate (22) It is fixed by welding with the main reinforcement (21) of the reinforcement cage; on both sides of the steel plate (22), two anchor reinforcements (24) are fixed by a set of studs (23); Hook the steel cage frame.

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