Foundation pit excavation method based on the soil at the bottom of existing buildings

Abstract

The present invention discloses a foundation pit excavation method based on the soil at the bottom of an existing building, which includes the steps of: using a first excavator to excavate an earth-taking pit outside the existing building and between two rows of vertical piles; using a second excavator to excavate at the bottom of the existing building to form a first earth pit and a first earth pile; arranging a first support plate between the two rows of vertical piles corresponding to the earth-taking pit, so that the first support plate covers the top of the transverse support beam, and the first end of the first support plate extends above the first earth pile and the second end extends above the earth-taking pit; using a third excavator to transfer the first earth pile to the top of the first end of the first support plate to form a second earth pile; using a bulldozer to push the second earth pile along the first support plate into the earth-taking pit to form a third earth pile; using the first excavator to transfer the third earth pile to the ground, thereby improving the earth excavation and transportation efficiency through the present application.

Description

Technical Field

[0001] The invention relates to the technical field of underground foundation pit excavation, and in particular to a foundation pit excavation method based on the soil at the bottom of an existing building. Background Art

[0002] With the development of society, the country pays more and more attention to the protection of historical buildings. When it is necessary to build a basement under a protected building, the previous plan of demolishing the protected building and rebuilding it after the basement construction is completed is no longer feasible. Instead, it is necessary to raise the top of the protected building to a certain elevation, then excavate the foundation pit below it and build the basement. During the excavation of the foundation pit, due to the influence of the protected building, the earth under the protected building needs to be transported horizontally to the outer soil taking point. Due to the long transportation distance and the dense arrangement of the underpinning piles and column piles under the protected building, the excavation efficiency will be greatly reduced.

[0003] In the traditional practice, multiple crawler excavators are arranged at the bottom of the foundation pit, and multiple crawler excavators use relays to transport the soil at the bottom of the foundation pit horizontally to the bottom of the excavation port. This method is inefficient; the excavators relay the soil many times, and the soil with a certain moisture content changes from the initial plastic state to a fluid plastic state after repeated overturning, making it difficult to transport; the excavator relay soiling requires a large number of excavators to be set up in the foundation pit, and a large number of excavators will emit a large amount of exhaust gas in the foundation pit. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a foundation pit excavation method based on the existing building bottom soil, thereby improving the excavation efficiency.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a foundation pit excavation method based on the soil at the bottom of an existing building, wherein a transverse support beam is pre-buried in the original foundation pit at the bottom of the existing building, and the excavation method comprises the following steps:

[0006] S1: Excavate the surface soil as a whole to the plane where the transverse support beam is located;

[0007] S2: using the first excavator to dig a soil pit outside the existing building and between two rows of vertical piles;

[0008] S3: using a second excavator to dig at the bottom of the existing building and between two rows of vertical piles corresponding to the borrow pit toward the borrow pit to form a first soil pit and a first soil pile;

[0009] S4: a first support plate is arranged between two rows of vertical piles corresponding to the borrow pit, so that the first support plate is covered on the top of the transverse support beam, and a first end of the first support plate extends above the first soil pile, and a second end extends above the borrow pit;

[0010] S5: Use the third excavator to transfer the first soil heap to the top of the first end of the first support plate to form a second soil heap;

[0011] S6: Use a bulldozer to push the second soil heap along the first support plate into the soil excavation pit to form a third soil heap;

[0012] S7: Use the first excavator to transfer the third soil heap to the ground.

[0013] A further improvement of the foundation pit excavation method based on the soil body at the bottom of the existing building of the present invention lies in that when performing step S3, the first soil pit changes with the excavation process of the second excavator, and the first soil heap is always located at one end of the first soil pit far from the soil excavation pit.

[0014] A further improvement of the foundation pit excavation method based on the soil body at the bottom of the existing building of the present invention lies in that there are multiple transverse support beams arranged vertically;

[0015] When performing step S3, layer by layer excavate the first soil pit based on the vertical distribution of the transverse support beams, and perform steps S4 to S7 during the process of excavating each layer of the first soil pit.

[0016] A further improvement of the foundation pit excavation method based on the soil body at the bottom of the existing building of the present invention lies in that the first excavator is a long-arm excavator, and the depth of the soil excavation pit is always not less than the depth of the first soil pit.

[0017] A further improvement of the foundation pit excavation method based on the soil body at the bottom of the existing building of the present invention lies in that when performing step S7, use a transport vehicle to transfer the soil on the ground.

[0018] A further improvement of the foundation pit excavation method based on the soil body at the bottom of the existing building of the present invention lies in that as the first soil pit is excavated layer by layer, use a crane to hoist the bulldozer to the top of each layer of the first support plate.

[0019] Compared with the prior art, the advantages of the present invention are as follows

[0020] 1. Reduce the use of excavators, reduce costs, and meet the requirements of green construction.

[0021] 2. By setting up support plates to provide a fast way for the bulldozer to transport soil, the transportation efficiency is improved. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of excavating the earthwork at the bottom of the support plate according to the foundation pit excavation method based on the existing building bottom soil of the present invention.

[0024] Figure 2 It is a schematic diagram of the first soil pile transfer of the foundation pit excavation method based on the existing building bottom soil of the present invention.

[0025] Figure 3 It is a schematic diagram of the second soil transfer of the foundation pit excavation method based on the existing building bottom soil of the present invention.

[0026] Figure 4 It is a schematic diagram of soil transfer in a soil excavation pit according to the present invention based on the foundation pit excavation method of the existing building bottom soil.

[0027] In the figure: 1. existing building; 2. transverse support beam; 3. first support plate; 4. first earth pile; 5. second excavator; 6. third excavator; 7. second earth pile; 8. third earth pile; 9. bulldozer; 10. first excavator; 11. transport vehicle. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0029] The foundation pit excavation method based on the bottom soil of an existing building of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] See also Figures 1 to 4 Based on the foundation pit excavation method of the existing building bottom soil, a transverse support beam 2 is pre-buried in the original foundation pit at the bottom of the existing building 1. The excavation method includes the following steps:

[0031] S1: Excavate the surface soil as a whole to the plane where the transverse support beam 2 is located;

[0032] Specifically, the surface soil is excavated downward as a whole using a conventional excavation method until the plane where the first transverse support beam 2 is located is reached.

[0033] S2: using the first excavator 10 to dig a soil pit outside the existing building 1 and between two rows of vertical piles;

[0034] S3: using a second excavator 5 to dig at the bottom of the existing building 1 and between two rows of vertical piles corresponding to the borrow pit toward the borrow pit to form a first soil pit and a first soil pile 4;

[0035] S4: Set a first support plate 3 between two rows of vertical piles corresponding to the soil borrowing pit, such that the first support plate 3 covers the top of the transverse support beam 2, and the first end of the first support plate 3 extends above the first soil heap 4, and the second end extends above the soil borrowing pit;

[0036] S5: Use the third excavator 6 to transfer the first soil heap 4 to the top of the first end of the first support plate 3 to form a second soil heap 7;

[0037] Specifically, the third excavator 6 is located in the plane where the transverse support beam 2 is located, on the side relatively close to the first end of the first support plate 3 and on the relatively outer side of the first soil pit.

[0038] S6: Use the bulldozer 9 to push the second soil heap 7 along the first support plate 3 into the soil borrowing pit to form a third soil heap 8;

[0039] S7: Use the first excavator 10 to transfer the third soil heap 8 to the ground.

[0040] By using the bulldozer 9 to transfer the soil mass to the soil borrowing pit to replace the traditional relay transfer by multiple excavators, the efficiency is improved, and at the same time, the use of excavators is reduced, saving costs.

[0041] Specifically, the first support plate 3 is a steel trestle board, and the support stability is enhanced by setting the steel trestle board.

[0042] Preferably, when performing step S3, the first soil pit changes with the excavation process of the second excavator 5, and the first soil heap 4 is always located at one end of the first soil pit far from the soil borrowing pit.

[0043] Specifically, the first soil pit expands from the first end of the first support plate 3 towards the second end of the first support plate 3.

[0044] Preferably, multiple transverse support beams 2 are arranged vertically;

[0045] When performing step S3, the first soil pit is excavated layer by layer based on the vertical distribution of the transverse support beam 2, and steps S4 to S7 are performed during the excavation of each layer of the first soil pit.

[0046] Preferably, the first excavator 10 is a long-arm excavator, and the depth of the soil borrowing pit is always not less than the depth of the first soil pit.

[0047] By setting the long-arm excavator, it is convenient to vertically excavate the soil borrowing pit and transfer the third soil heap 8 continuously along with the progress of the construction.

[0048] Specifically, when the designed position of the soil excavation pit is far from the ground surface, a second support plate is erected on top of the first transverse support beam 2 and at the top of the soil excavation pit, and the long-arm excavator is placed on the second support plate for excavating the soil excavation pit.

[0049] Preferably, when performing step S7, a transport vehicle 11 is used to transfer the ground soil.

[0050] Specifically, the second support plate is extended to the ground surface and forms a slope for the long-arm excavator and the transport vehicle 11 to pass through.

[0051] Specifically, before the overall excavation of the surface soil layer, the transport route of the transport vehicle 11 at the construction site is pre-designed to improve the transport efficiency.

[0052] Preferably, as the first soil pit is excavated layer by layer, a crane is used to hoist the bulldozer 9 to the top of each layer of the first support plate 3.

[0053] Specifically, after the excavation reaches the designed elevation, a crane is used to transfer the second excavator 5, the third excavator 6, and the bulldozer 9 to the ground surface.

[0054] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have any technical substance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0055] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not used to limit the present invention. Any person skilled in the art, without departing from the technical solution of the present invention, can make some changes or modifications to equivalent embodiments by using the technical content disclosed above. However, as long as it does not depart from the technical content of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for excavating a foundation pit based on the soil at the bottom of an existing building, wherein a transverse support beam is pre-buried in the original foundation pit at the bottom of the existing building, characterized in that: The excavation method includes the steps of: S1: Excavate the surface soil mass as a whole to the plane where the transverse support beam is located; S2: Use the first excavator to excavate an earth pit between two rows of vertical piles outside the existing building; S3: Use the second excavator to excavate in the bottom of the existing building and between two rows of vertical piles corresponding to the earth pit in the direction towards the earth pit to form a first earth pit and a first earth heap; S4: Set a first support plate between two rows of vertical piles corresponding to the earth pit, so that the first support plate covers the top of the transverse support beam, and the first end of the first support plate extends above the first earth heap, and the second end extends above the earth pit; S5: Use the third excavator to transfer the first earth heap to the top of the first end of the first support plate to form a second earth heap; S6: Use the bulldozer to push the second earth heap along the first support plate into the earth pit to form a third earth heap; S7: Use the first excavator to transfer the third earth heap to the ground.

2. The foundation pit excavation method based on the soil at the bottom of the existing building according to claim 1, characterized in that, When performing step S3, the first earth pit changes with the excavation process of the second excavator, and the first earth heap is always located at the end of the first earth pit far from the earth pit.

3. The foundation pit excavation method based on the soil at the bottom of the existing building according to claim 1, characterized in that, There are multiple transverse support beams arranged vertically; When performing step S3, layer by layer excavate the first earth pit based on the vertical distribution of the transverse support beam, and perform steps S4 to S7 during the process of excavating each layer of the first earth pit.

4. The foundation pit excavation method based on the soil at the bottom of the existing building according to claim 1, characterized in that, The first excavator is a long-arm excavator, and the depth of the earth pit is always not less than the depth of the first earth pit.

5. The foundation pit excavation method based on the soil at the bottom of the existing building according to claim 1, characterized in that, When performing step S7, use a transport vehicle to transfer the ground soil.

6. The foundation pit excavation method based on the soil body at the bottom of the existing building according to claim 3, characterized in that As the first earth pit is excavated layer by layer, use a crane to hoist the bulldozer to the top of each layer of the first support plate.

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