Hole wall supporting device of pile foundation pit hole

Abstract

The utility model discloses a hole wall supporting device of a pile foundation pit hole, which comprises a plurality of arc-shaped prefabricated wall protecting plates, a plurality of fixing holes penetrating along the thickness direction of the prefabricated wall protecting plates are arranged on the prefabricated wall protecting plates, and combed joint structures are arranged on two sides of the prefabricated wall protecting plates along the arc length direction of the prefabricated wall protecting plates; the multiple prefabricated wall protecting plates are arranged at intervals in the circumferential direction. The cast-in-place concrete connecting units are arranged between the two adjacent prefabricated wall protecting plates; and the fixing pieces penetrate through the fixing holes to fix the prefabricated wall protecting plates. The hole wall supporting device adopts a structure combining partial prefabrication and partial cast-in-place, and compared with a whole cast-in-place structure, the number of cast-in-place parts is small, and the hardening time needing to be waited is short; compared with a whole prefabricated structure, the prefabricated wall protecting plates are connected through the cast-in-place concrete connecting units, the problem that splicing cannot be achieved due to blocking of soil and gravel can be avoided, and meanwhile the structural integrity of the hole wall supporting device can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pile foundation construction, in particular to a hole wall supporting device of pile foundation pit. BACKGROUND

[0002] When constructing the pile foundation of a large building such as a bridge, construction personnel need to excavate a pit that is several meters or even tens of meters deep below the ground surface. In order to ensure the stability of these pits during excavation and prevent safety hazards such as collapse or mud blockage, a supporting device must be installed on the sidewall of the pile foundation pit for support. During construction, a segmented construction method is usually used, which involves excavating a pit to a certain depth, then installing a supporting device, and continuing to excavate downward until the desired depth is reached after the support is stable. Subsequently, reinforced concrete is poured into these pits to form a solid pile foundation.

[0003] Currently, the supporting device for a pile foundation pit is mainly divided into two types: cast-in-place and prefabricated. The cast-in-place supporting device forms a retaining wall structure by pouring concrete on site in the pit. After the concrete hardens, the next segment of the pit is excavated. However, this method requires waiting for the concrete to harden, resulting in a longer construction period and the need for improvement in efficiency.

[0004] The prefabricated supporting device uses pre-made reinforced concrete slabs for splicing to form a retaining wall structure. For example, the prior art CN213926295U uses this prefabricated construction method. This method effectively avoids the time waiting for the concrete to harden, however, in actual operation, due to the narrow working space in the pit and the presence of a large amount of dirt, gravel and other impurities, these impurities often get stuck between two prefabricated concrete slabs, making the splicing process difficult. This not only increases the difficulty of construction, but also may cause splicing errors or delays, thereby affecting the progress and quality of the entire project. In addition, the structural strength of the splicing position is insufficient, making the overall prefabricated supporting device weak.

[0005] In view of the above deficiencies of the prior art, it is necessary to improve the supporting device for a pile foundation pit to improve construction efficiency and quality and ensure the safe and smooth progress of the project. UTILITY MODEL CONTENTS

[0006] Therefore, the utility model provides a hole wall supporting device of pile foundation pit, which aims to optimize the construction efficiency and structural stability of the hole wall supporting device.

[0007] The utility model provides a scheme, which comprises:

[0008] A hole wall supporting device of pile foundation pit, comprising:

[0009] A plurality of prefabricated retaining wall plates, the prefabricated retaining wall plates are arc-shaped, a plurality of fixing holes penetrating through the thickness direction of the prefabricated retaining wall plates are arranged on the prefabricated retaining wall plates, and a zigzag structure is arranged on both sides of the arc length direction of the prefabricated retaining wall plates; and the plurality of prefabricated retaining wall plates are arranged in a circumferential direction.

[0010] A cast-in-place concrete connecting unit is arranged between two adjacent prefabricated retaining wall plates.

[0011] A fixing member is arranged to pass through the fixing hole to fix the prefabricated retaining wall plate.

[0012] As a further optional solution, the inner wall surface of the prefabricated retaining wall plate is arranged to be inclined, and the prefabricated retaining wall plate has a structure that the upper part has a larger thickness and the lower part has a smaller thickness.

[0013] As a further optional solution, the angle between the inner wall surface of the prefabricated retaining wall plate and the horizontal plane is 80°-85°.

[0014] As a further optional solution, the zigzag structure is provided with a vertical connecting hole.

[0015] As a further optional solution, the prefabricated retaining wall plate is provided with three pieces.

[0016] As a further optional solution, the prefabricated retaining wall plate is a reinforced concrete structure made of UHPC.

[0017] Compared with the prior art, the hole wall supporting device of the pile foundation pit has at least the following beneficial effects:

[0018] The hole wall supporting device of the pile foundation pit adopts a structure of partial prefabrication combined with partial cast-in-place, and compared with a totally cast-in-place structure, the cast-in-place part is smaller, the hardening time to be waited for is shorter, and the construction efficiency is higher; compared with a totally prefabricated structure, the prefabricated retaining wall plates are connected by the cast-in-place concrete connecting unit, the problem that the connection cannot be achieved due to the obstruction of soil and gravel can be avoided, the connection stability between the plurality of prefabricated retaining wall plates can be improved, and the structural integrity of the hole wall supporting device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of a hole wall supporting device of a pile foundation pit according to an embodiment of the present application;

[0020] Figure 2 is a structural schematic view of a prefabricated retaining wall plate according to an embodiment of the present application;

[0021] Figure 3 is a schematic view of the positional relationship of a plurality of prefabricated retaining wall plates according to an embodiment of the present application;

[0022] Figure 4 is Figure 2 is a schematic view of a cross section of a prefabricated retaining wall plate A-A in the middle;

[0023] Figure 5 is one of the construction process schematic diagrams of the hole wall supporting device of the pile foundation pit hole according to an embodiment of the utility model;

[0024] Figure 6 is the second construction process schematic diagram of the hole wall supporting device of the pile foundation pit hole according to an embodiment of the utility model;

[0025] Figure 7 is the third construction process schematic diagram of the hole wall supporting device of the pile foundation pit hole according to an embodiment of the utility model;

[0026] Figure 8 is the fourth construction process schematic diagram of the hole wall supporting device of the pile foundation pit hole according to an embodiment of the utility model;

[0027] In the figure: 100, pile foundation;

[0028] 1, prefabricated retaining wall plate; 11, fixing hole; 12, zigzag structure; 121, connecting hole;

[0029] 2, cast-in-place concrete connecting unit. DETAILED DESCRIPTION

[0030] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.

[0031] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0032] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] In the present utility model, unless otherwise expressly provided and limited, the first feature is "on" or "under" the second feature, which can be direct contact of the first and second features, or indirect contact of the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0034] Reference Figures 1-3 An embodiment of the present utility model shows a hole wall supporting device for pile foundation pit, including a plurality of prefabricated retaining wall plates 1, cast-in-place concrete connecting units 2 and fixing pieces (not shown), the prefabricated retaining wall plate 1 is arc-shaped, a plurality of fixed holes 11 are formed in the prefabricated retaining wall plate 1 and penetrate along the thickness direction thereof, and a herringbone structure 12 is arranged on both sides of the arc length direction of the prefabricated retaining wall plate 1; a plurality of prefabricated retaining wall plates 1 are arranged in a circumferential direction; the cast-in-place concrete connecting unit 2 is arranged between two adjacent prefabricated retaining wall plates 1; and the fixing piece passes through the fixed hole 11 to fix the prefabricated retaining wall plate 1.

[0035] The herringbone structure 12 can enhance the connection strength between the prefabricated retaining wall plate 1 and the cast-in-place concrete connecting unit 2 through the staggered arrangement thereof. After the cast-in-place concrete connecting unit 2 is poured and hardened, the herringbone structure 12 can ensure that a plurality of prefabricated retaining wall plates 1 form a firm whole, thereby improving the stability and durability of the whole structure. Due to the presence of the herringbone structure 12, the splicing between two prefabricated retaining wall plates 1 is more firm, and due to the arrangement of the cast-in-place concrete connecting unit 2, the splicing difficulty caused by the interference of soil and gravel is reduced, and the probability of construction delay and error is reduced.

[0036] Therefore, the hole wall supporting device for pile foundation pit adopts a structure of partially prefabricated and partially cast-in-place, the cast-in-place part is less than that of the whole cast-in-place structure, the hardening time to be waited for is shorter, and the construction efficiency is higher; compared with the whole prefabricated structure, the prefabricated retaining wall plates 1 are connected by the cast-in-place concrete connecting unit 2, which can avoid the problem of being unable to splice due to the obstruction of soil and gravel, improve the connection stability between a plurality of prefabricated retaining wall plates 1, and improve the structural integrity of the hole wall supporting device.

[0037] In the above scheme, the fixing piece can be a rod such as an anchor rod, which passes through the fixed hole 11 of the prefabricated retaining wall plate 1 and is inserted into the hole wall, so as to fix the prefabricated retaining wall plate 1 on the hole wall.

[0038] The prefabricated retaining wall plate 1 is a reinforced concrete structure made of UHPC.

[0039] In some embodiments, as shown in Figure 2 and Figure 3 , the Mahaya structure 12 is provided with a vertical through connecting hole 121. Among them, after arranging a plurality of prefabricated retaining wall plates 1, a formwork is arranged between adjacent prefabricated retaining wall plates 1, and then reinforced concrete is poured to form the cast-in-place concrete connecting unit 2; during pouring, the concrete will enter the connecting hole 121, so that the cross-linking between the cast-in-place concrete connecting unit 2 and the prefabricated retaining wall plate 1 is stronger, further improving the connection stability of the cast-in-place concrete connecting unit 2 and the prefabricated retaining wall plate 1.

[0040] In some embodiments, the inner wall surface of the prefabricated retaining wall plate 1 is inclined, and the prefabricated retaining wall plate 1 has a structure that the upper part is thicker and the lower part is thinner. Specifically, as shown in Figure 4 , the angle between the inner wall surface of the prefabricated retaining wall plate 1 and the horizontal plane is K, and K is 80°-85°.

[0041] Specifically, during construction, the segmented construction method is used, as shown in Figure 5 , a first pit is excavated first, and then the above-mentioned hole wall support device is arranged in the first pit. When arranging, a plurality of prefabricated retaining wall plates 1 are arranged in the first pit according to Figure 3 the distribution mode, then the prefabricated retaining wall plates 1 are fixed on the hole wall by using the fixing member, and then the cast-in-place concrete connecting unit 2 is formed by pouring, and after the cast-in-place concrete connecting unit 2 hardens, as shown in Figure 6 , a second pit is excavated, and after the second pit is excavated, a plurality of prefabricated retaining wall plates 1 are hoisted into the second pit, as shown in Figure 7 , the above-mentioned hole wall support device is formed in the second pit according to the above-mentioned arrangement mode, and the process is repeated until the pit is excavated to the preset depth; finally, the pile foundation 100 is formed by pouring, as shown in Figure 8 , due to the inclined arrangement of the inner wall surface of the prefabricated retaining wall plate 1, the bonding force between the pile foundation 100 and the hole wall support device is larger, and the pile foundation 100 is more stable.

[0042] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0043] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, which should be considered as the protection scope of the present application.

Claims

1. A device for supporting the walls of a pile foundation pit, characterised in that, The invention provides a pile foundation pit wall support device, comprising: a plurality of prefabricated wall panels, which are arc-shaped, and are provided with a plurality of fixing holes penetrating through the thickness direction of the prefabricated wall panels, and are provided with a herringbone structure on both sides along the arc length direction of the prefabricated wall panels; the plurality of prefabricated wall panels are arranged in a circumferential direction at intervals; a cast-in-place concrete connecting unit, which is arranged between two adjacent prefabricated wall panels; a fixing member, which penetrates through the fixing holes to fix the prefabricated wall panels.

2. The pile foundation pit wall support device according to claim 1, wherein: the inner wall surface of the prefabricated wall panel is arranged in an inclined manner, and the prefabricated wall panel has a structure in which the upper part is thicker and the lower part is thinner.

3. The pile foundation pit wall support device according to claim 2, wherein: the included angle between the inner wall surface of the prefabricated wall panel and the horizontal plane is 80°-85°.

4. The pile foundation pit wall support device according to claim 1 or 2, wherein: the herringbone structure is provided with a vertical connecting hole.

5. The pile foundation pit wall support device according to claim 1, wherein: the prefabricated wall panel is provided with three pieces.

6. The pile foundation pit wall support device according to claim 1, wherein: the prefabricated wall panel is a reinforced concrete structure made of UHPC.

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