CN111622228A

CN111622228A - Excavation method for stone in foundation pit

Info

Publication number: CN111622228A
Application number: CN202010329441.1A
Authority: CN
Inventors: 范晓亮; 关平
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-09-04

Abstract

The invention discloses a method for excavating stones in a foundation pit, which comprises the steps of firstly positioning and paying off, drilling holes at the crossed positions of cutting lines by adopting a water drill static force, cutting the holes to the bottom of an earth-rock square from top to bottom along the cutting lines, arranging a diamond wire saw in the drilled holes to horizontally cut the bottom of the earth-rock square, finally separating stones from the existing bedrock, implanting a lifting hook at the four corners of the stones for lifting, and lifting and transporting the stones one by one; when the method is used for construction under the conditions of rock geology, bottom or adjacent existing buildings, equipment and the like, the whole construction process is static cutting, and the horizontal back-cut technology based on the diamond wire saw has no influence on the existing buildings, equipment and the like, so that the safety of the adjacent buildings and equipment is ensured.

Description

Excavation method for stone in foundation pit

Technical Field

The invention belongs to the technical field of engineering construction, and particularly relates to a method for excavating stone in a foundation pit.

Background

In the existing engineering construction, the technology of cutting the earthwork mainly adopts a rock cutting machine to vertically cut the earthwork, and horizontal chiseling is carried out after the cutting is finished, so that vibration can be caused, and the existing buildings, equipment and the like are affected.

Under the conditions that the strength of the stone is high, and a business railway or a subway is arranged at the bottom or beside the stone or is close to a building or a structure, the mechanical chiseling or blasting process and other processes cannot be adopted, so that great difficulty is brought to the excavation of the stone in the rock geological foundation pit.

Disclosure of Invention

The purpose of this patent is to overcome prior art's not enough, provides the higher interior stone excavation method of foundation ditch of construction security to satisfy the vibrations control requirement of foundation ditch stone excavation.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for excavating stone in a foundation pit comprises the following steps

(1) Positioning and paying off: carrying out paying-off construction by a professional measurement engineer by using a total station, carrying out paying-off typesetting on the foundation pit to be excavated according to the typesetting size, and carrying out measurement paying-off bottom crossing;

(2) and (3) water drilling static drilling: drilling and cutting are carried out in a mode of hydrostatic drilling according to the intersection position of the positioned pay-off corner and the end part of the cutting line at the cutting line;

(3) the concrete cutting machine vertically cuts the earthwork: cutting the earthwork from the upper part to the lower part along the cutting line by using a concrete cutting machine to the bottom of the earthwork;

(4) installing and debugging the diamond wire saw: placing the diamond wire saw in the drilled hole, adjusting the direction and the machine placing position of the diamond wire saw, and preparing to cut the earth and stone squares of the foundation pit;

(5) the diamond wire saw horizontally cuts the earth and stone: horizontally cutting the bottom of the earth and stone by using a diamond wire saw, and finally separating stones from the existing bedrock;

(6) implanting a steel bar lifting hook: after cutting, implanting 4 steel bar lifting hooks at four corners of each stone block to be cut for lifting points during lifting construction to prepare for lifting;

(7) hoisting construction: and directly hoisting the cut stone blocks to an area which does not influence the construction by adopting a 25t truck crane for centralized stacking.

Wherein, the earthwork is typeset according to the size of 0.5x0.5x0.8m in the step (3).

Wherein, the lifting hook adopts C25 steel bar.

The invention has the technical effects that: according to the method, the holes are drilled in the crossed positions of cutting lines by using a water drill static force, then the holes are cut vertically, then the holes are cut to the bottom of an earth and stone square along the cutting lines from top to bottom, then a diamond wire saw is used for horizontal cutting, the stone square is cut into blocks and then hoisted and transported outwards one by one, the whole construction process is static force cutting, existing buildings, equipment and the like are not affected, and the safety of the adjacent buildings and equipment is guaranteed.

Drawings

FIG. 1 is a schematic diagram of step (2) of the process of the present invention;

FIG. 2 is a schematic diagram of step (3) of the process of the present invention;

FIG. 3 is a schematic diagram of step (5) of the method of the present invention;

fig. 4 is a schematic view of the cut earthwork of the present invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

The invention discloses a method for excavating stone in a foundation pit, which comprises the following steps

(1) And (6) positioning and paying off.

And (3) performing paying-off construction by using a total station by a professional measurement engineer, performing paying-off typesetting on the foundation pit to be excavated according to the typesetting size, and performing measurement paying-off bottom crossing before construction.

(2) And (5) performing water drilling static force drilling.

And (3) drilling and cutting by adopting a mode of hydrostatic drilling at the intersection position of the cutting line and the corner positioned and paid off, as shown in figure 1.

(3) The concrete cutting machine vertically cuts the earthwork.

The earthwork is typeset according to the size of 0.5x0.5x0.8m, and is cut from the upper part to the lower part along a cutting line by using a concrete cutter to the bottom of the earthwork as shown in fig. 2.

(4) And (5) installing and debugging the diamond wire saw.

Placing the diamond wire saw in the drilled hole, adjusting the direction and the machine placing position of the diamond wire saw, and preparing to cut the earth and stone squares of the foundation pit;

(5) the diamond wire saw cuts the earth and stone horizontally.

The diamond wire saw (diamond chain wire saw) was used to horizontally cut the earth and rock square bottom, finally separating the rock from the existing bedrock, as shown in fig. 3.

(6) And implanting a steel bar hook.

After the cutting is finished, 4C 25 steel bar hooks are implanted into four corners of each stone block to be cut for hoisting points during hoisting construction, and the stone block is ready to be hoisted, as shown in figure 4.

(7) And (5) hoisting construction.

And directly hoisting the cut stone blocks to an area which does not influence the construction by adopting a 25t truck crane for centralized stacking.

According to the excavation method, aiming at the places with higher construction safety, the water drill static force is adopted to drill holes at the crossed positions of the cutting lines, then the holes are vertically cut, then the holes are cut to the bottom of an earth-rock square along the cutting lines from top to bottom, and then the diamond wire saw is adopted to horizontally cut, so that the existing equipment is not influenced, and the construction is safe.

The geology of the Chongqing North station is sandstone, the rock strength is hard and can reach about 40Mpa, and according to the conversion structure scheme, the minimum distance between the bottom of the conversion arched beam and the tunnel between the track traffic ten-line areas is only 2.5m, so that a static cutting mode is adopted in the excavation process of the earthwork of the foundation pit, and the influence of the excavation of the earthwork on the tunnel between the track traffic ten-line areas at the bottom is controlled.

And (3) cutting earth and stone excavation of the foundation pit by adopting a diamond wire saw, typesetting and cutting the earth and stone according to the size of 0.5X0.5 according to the earth absorption and the loading capacity of a soil-blocking transport vehicle, and separating and hoisting after the earth and stone are cut into the size of 0.5X0.8m in blocks.

The method comprises the steps of cutting an earthwork by using a concrete cutting machine, drilling by using a rhinestone, ensuring the bottom of the earthwork after a diamond chain can be cut, finally performing horizontal cutting from the bottom of the cut earthwork by using a diamond chain rope saw, finally separating stones from existing bedrocks, and finally planting bars by using a truck crane for hoisting.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method for excavating stone in a foundation pit is characterized by comprising the following steps: comprises the following steps

(1) Positioning pay-off

Carrying out paying-off and typesetting on the foundation pit to be excavated by using a total station, and paying off and bottom-crossing;

(2) static drilling of water drill

Drilling holes at the crossed positions of the cutting lines by adopting a water drilling static force mode according to the positioning pay-off;

(3) concrete cutting machine for vertically cutting earthwork

Cutting to the bottom of the earthwork along a cutting line by using a concrete cutting machine;

(4) installation and debugging of diamond wire saw

(5) diamond wire saw horizontal cutting earth and stone square

Horizontally cutting the bottom of the earth and stone by using a diamond wire saw, and finally separating stones from the existing bedrock;

(6) implanted steel bar lifting hook

Implanting steel bar lifting hooks at four corners of the stone block as lifting points for lifting construction;

(7) hoisting construction

And directly hoisting the cut stone blocks to an area which does not influence the construction by using a truck crane for centralized stacking.

2. The method for excavating the stone in the foundation pit according to claim 1, wherein in the step (3), the stone is typeset according to the size of 0.5 x0.5x0.8m.

3. The excavation method for the stone in the foundation pit as claimed in claim 1, wherein the lifting hook is made of C25 steel bars.