Supporting structure of arch-shaped supporting foundation pit

Abstract

The utility model discloses a supporting structure of an arch-shaped supporting foundation pit, which comprises a downwards excavated underground continuous wall body, a concrete straight support, a steel upright post, an upright post pile, an arch-shaped supporting beam and a steel support, one section of the steel upright post is arranged in the upright post pile, and the other end of the steel upright post is connected with the concrete straight support; arch-shaped supporting beams are arranged on the two sides of the steel stand columns, and embedded bolt holes are formed in the arch-shaped supporting beams; a steel support is arranged on the arch back face of the arch-shaped supporting beam, one end of the steel support is connected with the arch-shaped supporting beam, and the other end of the steel support is connected with the underground continuous wall. The segmented arched supporting beam assembly structures are mutually offset, middle horizontal soil pressure is transmitted to the segmented arched supporting beam assembly structures through the steel supports to be mutually offset, upward pulling force received by the arched supporting beams is transmitted to the stand column piles through the steel stand columns to be offset through soil friction force, and stability of the foundation pit is guaranteed; when a foundation pit supporting system is completely formed, most of core soil in the foundation pit is reserved, and deformation of the foundation pit is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to subway foundation pit technical field especially is related to a support structure of arch support foundation pit. BACKGROUND

[0002] In the subway foundation pit construction, in order to guarantee the conventional steel support construction, steel support needs to be constructed after excavation, the core soil in the middle of foundation pit cannot be preserved, and under the condition that the lower force steel support is long, the stability of steel support is poor, under the condition that the soil quality of foundation pit is poor, the overall deformation of foundation pit is easily caused, the stability of support system is poor, thereby the safety of foundation pit is affected. UTILITY MODEL CONTENTS

[0003] In order to solve the problems in the background art, the utility model provides a support structure of arch support foundation pit.

[0004] The utility model adopts the following technical scheme:

[0005] A support structure of arch support foundation pit, characterized by comprising the underground continuous wall body of excavation, concrete straight support, steel column, column pile, arch support beam and steel support, one end of the steel column is arranged in the column pile, and the other end is connected with the concrete straight support, the arch support beam is arranged on the both sides of the steel column, the arch support beam is internally provided with embedded bolt holes, the steel support is arranged on the back of the arch support beam, one end of the steel support is connected with the arch support beam, and the other end is connected with the underground continuous wall body.

[0006] Further, the arch support beam connected with the steel support is internally provided with embedded arc-shaped steel plates, and the underground continuous wall body connected with the steel support is internally provided with embedded steel plates.

[0007] Further, the arch support beam is composed of a plurality of segmented arch support beams, the plurality of segmented arch support beams are internally provided with bolt holes, and the plurality of segmented arch support beams are connected through bolts, the arch support beam is an about 120° arch structure, and a plurality of the prefabricated arc-shaped concrete blocks are connected through the bolt connection system.

[0008] Further, the arch support beam and the steel column are filled with expanded concrete at the joint, and the arch support beam and the column pile are connected and fixed through the expanded concrete.

[0009] Further, the arch support beam and the steel support are provided with inclined support supports at the joint, the steel support and the underground continuous wall body are provided with steel inclined supports at the joint, the steel support and the arch support and the underground continuous wall are connected through the embedded steel plates, and the arch support beam and the underground continuous wall are fixed through the expanded concrete.

[0010] An arch support foundation pit supporting structure, the earth pressure of the underground diaphragm wall, the lowest horizontal earth pressure is counteracted by a plurality of segmented arch support beam assembly structures, the middle horizontal earth pressure is transmitted to the plurality of segmented arch support beam assembly structures by steel supports and counteracted, the uplift force received by the arch support beam is transmitted to the column pile by the steel column through the soil friction force, and the formation of the system ensures the stability of the foundation pit, while the foundation pit supporting system is completely formed, most of the core soil in the foundation pit is reserved, and the deformation of the foundation pit is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 A kind of arch support foundation pit supporting system and construction method section schematic view provided by the utility model;

[0012] Figure 2 A kind of arch support foundation pit supporting system and construction method excavation step 1 schematic view provided by the utility model;

[0013] Figure 3 A kind of arch support foundation pit supporting system and construction method excavation step 2 schematic view provided by the utility model;

[0014] Figure 4 A kind of arch support foundation pit supporting system and construction method excavation step 3 schematic view provided by the utility model;

[0015] Figure 5 A kind of arch support foundation pit supporting system and construction method excavation step 4 schematic view provided by the utility model;

[0016] Figure 6 A kind of arch support foundation pit supporting system and construction method excavation step 5 schematic view provided by the utility model;

[0017] Figure 7 A kind of arch support foundation pit supporting system and construction method first arch support beam 6 and column 3 connection detail drawing provided by the utility model.

[0018] Figure 8 A kind of arch support foundation pit supporting system and construction method arch support beam connection detail drawing provided by the utility model.

[0019] Figure 9 A kind of arch support foundation pit supporting system and construction method secondary arch support beam 7,8 and steel support 5 connection detail drawing provided by the utility model.

[0020] Figure 10 A kind of arch support foundation pit supporting system and construction method underground diaphragm wall 1 and steel support 5 connection detail drawing provided by the utility model.

[0021] The serial numbers marked in the figure represent, in turn: 1 - underground continuous wall body; 2 - concrete straight support; 3 - steel column; 4 - column pile; 5 - steel support; 6 - arched support beam; 7 - second arched support beam; 8 - third arched support beam; 9 - final block arched support beam; 11 - embedded steel plate; 12 - expanded concrete; 13 - steel inclined support; 51 - inclined support support; 62 - embedded bolt hole; 63 - M30 bolt system; 71 - embedded arc-shaped steel plate DETAILED DESCRIPTION

[0022] The utility model will be explained further in detail below in combination with the drawings and specific embodiments.

[0023] With reference to the drawings,

[0024] An arched support foundation pit support structure, comprising a dug underground continuous wall body 1, a concrete straight support 2, a steel column 3, a column pile 4, an arched support beam 6 and a steel support 5, the steel column 3 is arranged in the column pile 4 at one end, and the other end is connected with the concrete straight support 2; the steel column 3 is provided with the arched support beam 6 on both sides, and the arched support beam 6 is internally provided with an embedded bolt hole 62; the arched support beam 6 is provided with the steel support 5 on the back of the arch, one end of the steel support 5 is connected with the arched support beam 6, and the other end is connected with the underground continuous wall body 1.

[0025] The arched support beam 6 connected with the steel support 5 is internally provided with an embedded arc-shaped steel plate 71, and the underground continuous wall body 1 connected with the steel support 5 is internally provided with an embedded steel plate 11.

[0026] The arched support beam 6 is composed of a plurality of segmented arched support beams, the plurality of segmented arched support beams are internally provided with embedded bolt holes 62, and the plurality of segmented arched support beams are connected through a bolt system 63. The arched support beam is an about 120° arched structure, and is connected through a plurality of the prefabricated arc-shaped concrete blocks through a bolt connection system.

[0027] The arched support beam 6 and the steel column 3 are filled with expanded concrete 12 at the joint. The arched support beam 6 and the column pile 4 are connected and fixed through the expanded concrete 12

[0028] The arched support beam 6 is provided with an inclined support support 51 at the connection with the steel support 5, and the steel support 5 is provided with a steel inclined support 13 at the connection with the underground continuous wall body 1. The steel support 5 is connected at the connection with the arched support beam 6 and the underground continuous wall body 1 through the embedded steel plate 11. The arched support beam 6 is fixed at the connection with the underground continuous wall body 1 through the expanded concrete 12.

[0029] An arch support foundation pit support structure, the earth pressure of the underground continuous wall, the lowest horizontal earth pressure is offset by the segmented arch support beam assembly structure, the middle horizontal earth pressure is transmitted to the segmented arch support beam assembly structure by the steel support, the uplift force received by the arch support beam is transmitted to the column pile by the steel column through the soil friction force, the formation of the above system ensures the stability of the foundation pit, while the foundation pit support system is formed, most of the core soil in the foundation pit is reserved, and the deformation of the foundation pit is reduced.

[0030] The specific construction steps are as follows:

[0031] S1: first excavate the trench underground continuous wall 1, lower the ground wall steel reinforcement cage, set the embedded steel plate 11 in the ground wall steel reinforcement cage, and pour the underground continuous wall 1 into a whole by the embedded steel plate 11, construct the column pile 4, and put in the steel column 3;

[0032] S2: construct the first block arch support beam 6 and the second block arch support beam 7 of the prefabricated concrete structure according to the size specification of the foundation pit, and reserve the connecting bolt hole 62 according to the connection requirement, so as to facilitate the installation of the connecting bolt system 63;

[0033] S3: excavate the foundation pit to the elevation of the concrete straight support 2, pour the concrete straight support 2, and anchor into the steel column 3, as shown in Figure 2 ;

[0034] S4: after the concrete straight support 2 reaches the design strength, continue to excavate the foundation pit to the elevation of the first block arch support beam 6, assemble the two first block arch support beams 6 by using the connecting bolt system 63, and fill the expanded concrete 12, as shown in Figure 3 ;

[0035] S5: continue to excavate the foundation pit to the elevation of the second block arch support beam 7, assemble the first block arch support beam 6 and the second block arch support beam 7 by using the connecting bolt system 63, and set the steel support 5 at the predetermined height, as shown in Figure 4 ;

[0036] S6: continue to excavate the foundation pit to the elevation of the second block arch support beam 8, assemble the second block arch support beams 7 and 8 in turn by using the connecting bolt system 63, and set the steel support 5 at the predetermined height, as shown in Figure 5 ;

[0037] S7: continue to excavate the foundation pit to the elevation of the last block arch support beam 9, assemble the second block arch support beams 7 and the last block arch support beam 9 in turn by using the connecting bolt system 63, and fill the expanded concrete 12 at the joint with the underground continuous wall 1, as shown in Figure 6 ;

[0038] S8: excavate the foundation pit, as shown in Figure 1 , with the structure back to the construction, the support system is removed in turn, and the recycling work of the support system is completed.

[0039] It should be noted that the above only describes the preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An arching support structure for supporting a foundation pit, characterized by, The underground continuous wall includes a dug underground continuous wall, a concrete straight support, a steel column, a column pile, an arch-shaped support beam and a steel support, one end of the steel column is arranged in the column pile, and the other end is connected with the concrete straight support, two sides of the steel column are provided with the arch-shaped support beams, the arch-shaped support beams are internally provided with embedded bolt holes, the arch-shaped support beams are provided with the steel supports on the arch back surfaces, one end of the steel supports is connected with the arch-shaped support beams, and the other end is connected with the underground continuous wall.

2. A retaining structure for a foundation trench supported by arches according to claim 1, wherein The arch-shaped support beams connected with the steel supports are internally provided with embedded arc-shaped steel plates, and the underground continuous wall connected with the steel supports is internally provided with an embedded steel plate.

3. A retaining structure for a foundation pit supported by an arch, according to claim 1, wherein The arch-shaped support beam is composed of a plurality of segmented arch-shaped support beams, the plurality of segmented arch-shaped support beams are internally provided with bolt holes, and the plurality of segmented arch-shaped support beams are connected through bolts.

4. A retaining structure for a foundation trench supported by an arch according to claim 1 or 3, wherein The arch-shaped support beam and the steel column are filled with expanded concrete at the joint.

5. A retaining structure for a foundation pit supported by arches according to claim 2, wherein The arch-shaped support beam is provided with an inclined support seat at the connection position of the steel support, and the steel support is provided with a steel inclined support at the connection position of the underground continuous wall.

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