CN116254846A

CN116254846A - Foundation pit excavation method based on existing building bottom soil body

Info

Publication number: CN116254846A
Application number: CN202310162219.0A
Authority: CN
Inventors: 龚达; 张琨; 金国栋; 杨帆; 黄喆皓; 熊浩; 张洁; 宋秀雷; 吴光辉; 郭苁蓉
Original assignee: China Construction Eighth Engineering Division Co Ltd
Current assignee: China Construction Eighth Engineering Division Co Ltd
Priority date: 2023-02-24
Filing date: 2023-02-24
Publication date: 2023-06-13

Abstract

The invention discloses a foundation pit excavation method based on the soil body at the bottom of an existing building, which comprises the following steps: digging a soil taking pit between two rows of vertical piles at the periphery of an existing building by using a first digging machine; digging the bottom of the existing building by using a second digging machine and forming a first soil pit and a first soil pile; a first supporting plate is arranged between two rows of vertical piles corresponding to the soil taking pit, the top of the transverse supporting beam is covered by the first supporting plate, the first end of the first supporting plate extends to the upper part of the first soil pile, and the second end of the first supporting plate extends to the upper part of the soil taking pit; transferring the first soil pile to the top of the first end of the first supporting plate by using a third excavator and forming a second soil pile; pushing the second soil pile into the soil taking pit along the first supporting plate by utilizing a bulldozer and forming a third soil pile; utilize first dig the machine will the third soil heap shifts to ground, has improved earth excavation transport efficiency through this application.

Description

Foundation pit excavation method based on existing building bottom soil body

Technical Field

The invention relates to the technical field of underground foundation pit excavation, in particular to a foundation pit excavation method based on the existing building bottom soil body.

Background

With the development of society, countries pay more and more attention to the protection of historical buildings, when a basement needs to be built below the protection building, the protection building is removed, and the scheme of reconstruction after the basement construction is completed is not feasible. But the protection building is lifted to a certain elevation by underpinning, and then a foundation pit is excavated below the protection building, and a basement is built. During excavation of the foundation pit, due to the influence of the protected building, earthwork below the protected building needs to be horizontally dumped to peripheral soil sampling points. Because the transport distance is longer, the underpinning piles and the upright post piles below the protection building are densely distributed, the soil outlet efficiency can be greatly reduced.

In the traditional method, a plurality of crawler-type excavators are arranged at the bottom of a foundation pit, and the crawler-type excavators adopt a relay mode to horizontally transport earthwork at the bottom of the foundation pit to the position below a soil outlet. This approach is inefficient; the soil body with a certain water content is turned over repeatedly from an initial plastic state to become fluid plastic, so that the soil body is difficult to transport; the relay soil dumping of the excavator is realized by arranging a large number of excavators in the foundation pit, and a large number of excavators can discharge a large amount of waste gas in the foundation pit.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a foundation pit excavation method based on the existing building bottom soil body, so that the excavation efficiency is improved.

In order to achieve the above purpose, the invention adopts the following technical scheme: the foundation pit excavation method based on the soil body at the bottom of the existing building comprises the following steps of:

s1: excavating the whole surface soil body to the plane of the transverse supporting beam;

s2: digging a soil taking pit between two rows of vertical piles at the periphery of an existing building by using a first digging machine;

s3: digging a first soil pit and a first soil pile by using a second digging machine at the bottom of an existing building and between two rows of vertical piles corresponding to the soil pit towards the soil pit;

s4: a first supporting plate is arranged between two rows of vertical piles corresponding to the soil taking pit, the top of the transverse supporting beam is covered by the first supporting plate, the first end of the first supporting plate extends to the upper part of the first soil pile, and the second end of the first supporting plate extends to the upper part of the soil taking pit;

s5: transferring the first soil pile to the top of the first end of the first supporting plate by using a third excavator and forming a second soil pile;

s6: pushing the second soil pile into the soil taking pit along the first supporting plate by utilizing a bulldozer and forming a third soil pile;

s7: and transferring the third soil pile to the ground by using the first digging machine.

The foundation pit excavation method based on the existing building bottom soil body is further improved in that when the step S3 is executed, the first soil pit changes along with the excavation process of the second excavator, and the first soil pile is always located at one end, far away from the soil taking pit, of the first soil pit.

The foundation pit excavation method based on the existing building bottom soil body is further improved in that a plurality of transverse supporting beams are vertically arranged;

and when the step S3 is executed, excavating the first soil pits layer by taking the vertical distribution of the transverse supporting beams as a reference, and executing the steps S4 to S7 in the process of excavating each layer of the first soil pits.

The foundation pit excavation method based on the existing building bottom soil body is further improved in that the first excavator is a long-arm excavator, and the depth of the soil taking pit is not smaller than that of the first soil pit all the time.

The foundation pit excavation method based on the existing building bottom soil body is further improved in that the ground soil body is transferred by utilizing a transport vehicle when the step S7 is executed.

The foundation pit excavation method based on the existing building bottom soil body is further improved in that as the first soil pit is excavated layer by layer, the bulldozer is hoisted to the top of each layer of the first supporting plate by using the crane.

Compared with the prior art, the invention has the advantages that,

1. the use of the excavator is reduced, the cost is reduced, and the requirements of green construction are met.

2. The bulldozer can quickly transport earthwork by arranging the supporting plate, so that the transportation efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of bottom earth excavation of a support plate based on a foundation pit excavation method of an existing building bottom soil body.

Fig. 2 is a schematic diagram of a first pile transfer according to the foundation pit excavation method based on the existing building bottom soil.

Fig. 3 is a second soil mass transfer schematic diagram of the foundation pit excavation method based on the existing building bottom soil mass.

Fig. 4 is a schematic diagram of earth transfer in a pit based on the foundation pit excavation method of the existing building bottom soil.

In the figure: 1. existing buildings; 2. a transverse support beam; 3. a first support plate; 4. a first soil heap; 5. a second excavator; 6. a third digger; 7. a second soil heap; 8. a third soil heap; 9. a bulldozer; 10. a first excavator; 11. and (5) a transport vehicle.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.

The foundation pit excavation method based on the existing building bottom soil body is further described in detail below with reference to the accompanying drawings and the specific embodiments.

Referring to fig. 1 to 4, a foundation pit excavation method based on the soil body at the bottom of an existing building, wherein a transverse supporting beam 2 is pre-embedded in an original foundation pit at the bottom of the existing building 1, the excavation method comprises the following steps:

s1: excavating the whole surface soil body to the plane of the transverse supporting beam 2;

specifically, the surface soil body is excavated downwards as a whole by adopting a traditional excavating method until the first transverse supporting beam 2 is positioned on the plane,

s2: digging a soil pit around the existing building 1 and between two rows of vertical piles by using a first digging machine 10;

s3: digging and forming a first soil pit and a first soil pile 4 by using a second digging machine 5 at the bottom of the existing building 1 and between two rows of vertical piles corresponding to the soil pit towards the soil pit;

s4: a first supporting plate 3 is arranged between two rows of vertical piles corresponding to the soil taking pit, the first supporting plate 3 is covered on the top of the transverse supporting beam 2, the first end of the first supporting plate 3 extends to the upper part of the first soil pile 4, and the second end extends to the upper part of the soil taking pit;

s5: transferring the first soil mass 4 to the top of the first end of the first support plate 3 using a third digger 6 and forming a second soil mass 7;

specifically, the third excavator 6 is located on the plane of the cross support beam 2, on a side relatively close to the first end of the first support plate 3 and on an opposite outer side of the first pit.

S6: pushing the second pile 7 along the first support plate 3 into the pit by means of a bulldozer 9 and forming a third pile 8;

s7: the third pile 8 is transferred to the ground using the first excavator 10.

The soil body is transferred to the soil pit by utilizing the bulldozer 9 to replace the traditional relay type transfer of the multiple digers, so that the efficiency is improved, the investment of the digers is reduced, and the cost is saved.

Specifically, this first backup pad 3 is steel landing gear board, has strengthened supporting stability through setting up this steel landing gear board.

Preferably, in executing step S3, the first pit changes with the excavation process of the second excavator 5, and the first pile 4 is always located at an end of the first pit away from the pit.

Specifically, the first pit is expanded from the first end of the first support plate 3 toward the second end of the first support plate 3.

Preferably, the transverse supporting beams 2 are vertically provided with a plurality of channels;

and when the step S3 is executed, excavating the first soil pits layer by taking the vertical distribution of the transverse supporting beams 2 as a reference, and executing the steps S4 to S7 in the process of excavating each layer of the first soil pits.

Preferably, the first excavator 10 is a long arm excavator, and the depth of the pit is not less than the depth of the first pit all the time.

By arranging the long-arm excavator, the soil pit is conveniently excavated vertically all the time along with development of the construction progress and the third soil pile 8 is transferred.

Specifically, when the design position of the pit is far from the ground, a second support plate is supported on the top of the first transverse support beam 2 and on the top of the pit, and the long-arm excavator is arranged on the second support plate to excavate the pit.

Preferably, in the execution of step S7, the ground soil is transferred by means of the transport vehicle 11.

Specifically, the second support plate is extended to the ground and formed with a slope through which the long-arm digger and the transporting carriage 11 pass.

Specifically, before the whole surface soil body is excavated, the transportation route of the transportation vehicle 11 on the construction site is designed in advance, so that the transportation efficiency is improved.

Preferably, as the first pit is excavated layer by layer, the bulldozer 9 is lifted to the top of each layer of the first supporting plate 3 using a crane.

Specifically, after excavation to the designed elevation, the second excavator 5, the third excavator 6, and the bulldozer 9 are transferred to the ground by using an crane.

It should be noted that, the structures, proportions, sizes and the like shown in the drawings attached to the present specification are used for understanding and reading only in conjunction with the disclosure of the present specification, and are not intended to limit the applicable limitations of the present invention, so that any modification of the structures, variation of proportions or adjustment of sizes of the structures, proportions and the like should not be construed as essential to the present invention, and should still fall within the scope of the disclosure of the present invention without affecting the efficacy and achievement of the present invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.

The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.

Claims

1. The foundation pit excavation method based on the soil body at the bottom of the existing building is characterized by comprising the following steps of:

2. The method of excavation of a foundation pit based on existing building bottom soil according to claim 1, wherein the first pit is changed with the excavation process of the second excavator when step S3 is performed, and the first pile is always located at an end of the first pit away from the pit.

3. The foundation pit excavation method based on the existing building bottom soil body as claimed in claim 1, wherein the transverse supporting beams are vertically provided with a plurality of channels;

4. The foundation pit excavation method based on the existing building bottom soil body according to claim 1, wherein the first excavator is a long-arm excavator, and the depth of the soil pit is not smaller than the depth of the first soil pit all the time.

5. The method for excavation of foundation pit based on existing building bottom soil according to claim 1, wherein the ground soil is transferred by means of a carrier vehicle when step S7 is performed.

6. A foundation pit excavation method based on existing building bottom soil as claimed in claim 3, wherein the bulldozer is hoisted to the top of each layer of the first support plate by means of a crane as the first pit is excavated layer by layer.