DE112021000151T5 - Method of supporting the construction pit in the geological condition of the soil layer mixed with stone blocks - Google Patents

Abstract

A method for supporting the excavation under the geological condition of the soil layer mixed with boulders, comprising the steps of: S1: geological exploration to find the position of the boulders on the excavation path of the excavation; S2: Measure and position the boundary of the excavation; S3: the boring machine cuts the stone blocks along the boundary of the excavation support; after the drilling machine has first drilled several large holes in the soil layer above the stone blocks, the protective pipes are respectively inserted into the many large holes, and then small holes are drilled in the stone blocks through the protective pipes, and then hydraulic splitting machines are inserted into the small holes inserted to split the stone blocks to form a crack by the hydraulic splitting machines; S4: Excavating the surface soil, installing the steel purlin and driving the sheet steel pile; wherein the support structure comprises a plurality of plug-in plates and a connecting plate, and clamping grooves corresponding to the plug-in plates are provided on both sides of the connecting plate. The present invention solves the problem that under the geological condition of the existing soil layer mixed with stone blocks, the excavation supports cannot penetrate the stone blocks, and multiple work surfaces can be started at the same time, saving construction time and causing no environmental pollution.

Description

TECHNICAL AREA

The present invention relates to a method of supporting the excavation under the geological condition of the soil layer mixed with stone blocks.

STATE OF THE ART

Various types of excavation support structures are widely used in the construction process of excavating new excavation pits, and there are forms such as I-beam pile support, Larssen steel sheet steel pile support, cement mixed pile support. Under the geological conditions where there are many large stone blocks in the soil layer, the pile head of 1-girder, Larssen pile or mixed cement pile cannot pierce the stone blocks, these support structures cannot be used directly, only blast the stone blocks or break, after over-excavation and replacement filling, the support piles are driven in, then reverse trenching is carried out, which not only causes a sharp increase in project investment and lengthens the construction period, but also easily causes safety accidents and affects surrounding roads or houses.

CONTENT OF THE PRESENT INVENTION

In view of the above problems, the present invention provides a method for supporting excavation under the geological condition of the boulder-mixed soil layer to solve the problems that under the geological condition of the existing boulder-mixed soil layer the Excavation support cannot pierce the stone blocks, but only blast or break the stone blocks, after over-excavation and replacement filling, the support piles are driven in, and then reverse trenching is carried out, causing a sharp increase in project investment, lengthening the construction period, and affecting surrounding roads or houses.

• ein Verfahren zur Unterstützung der Baugrube unter der geologischen Bedingung der mit Steinblöcken gemischten Bodenschicht, umfassend die folgenden Schritte:
  • S1: geologische Erkundung, um die Position der Steinblöcke auf dem Ausgrabungsweg der Baugrube;
  • S2: Messen und Positionieren der Grenze der Baugrube;
  • S3: die Bohrmaschine bearbeitet die Steinblöcke entlang der Grenze der Baugrubenstütze;
  • S4: Ausheben des Oberflächenbodens, Installieren der Stahlpfette und Eintreiben des Stahlblechpfahls nach dem Anordnen der Stützkonstruktion in dem Bohrloch.

In order to solve the above technical problems, the present invention uses a following technical solution:

• a method of supporting the construction pit under the geological condition of the soil layer mixed with stone blocks, comprising the following steps:
  • S1: geological survey to determine the position of the stone blocks on the excavation path of the excavation pit;
  • S2: Measure and position the boundary of the excavation;
  • S3: the boring machine cuts the stone blocks along the boundary of the excavation support;
  • S4: Excavating the surface soil, installing the steel purlin and driving the sheet steel pile after placing the support structure in the borehole.

When the above-mentioned step S3 is executed, the borehole is required to go through the stone blocks.

The support structure comprises a protective tube passing through the borehole, an I-bar being placed in the protective tube, and the space between the I-bar and the protective tube being filled with cement grouts.

In executing the above-mentioned step S3, after the boring machine first bores a plurality of large holes in the soil layer above the stone blocks, the protective pipes are respectively inserted into the many large holes, and then small holes are drilled in the stone blocks through the protective pipes, and then hydraulic splitters are inserted into the small holes to split the stone blocks to form a crack by the hydraulic splitters.

The supporting structure includes a plurality of mortice plates and a connecting plate, with clamping grooves corresponding to the mortice plates provided on the two sides of the joint plate, and after the hydraulic splitting machines split the stone blocks to form a crack, the ram first inserted the respective mortice plates into the crack between two adjacent protection tubes, and then disassembling the hydraulic splitting machines and the protection tubes to insert the connection plate into the gap between the insertion plates.

1. 1. die Projektkosten sind niedrig und die Bauzeit ist kurz; mit diesem Verfahren zur Unterstützung der Baugrube werden die Projektkosten um mindestens 40% im Vergleich zum Prozess mit Überaushub, Ersetzungsfüllung und Rückwärts-Grabenaushub reduziert, und gleichzeitig können mehrere Arbeitsflächen begonnen werden, was die Bauzeit einspart und keine Umweltverschmutzung verursacht;
2. 2. geringen Platzbedarf, starke Anpassungsfähigkeit an das umliegende Gelände und hohe Sicherheit; es ist im Wesentlichen nicht durch das umliegende Gelände und die Gebäude eingeschränkt, und der Aushub wird erst durchgeführt, nachdem die Baugrubenstütze abgeschlossen war, wodurch eine gute Sicherheit erzielt wird, und die umliegenden Straßen und Gebäude werden nicht beeinträchtigt;
3. 3. nachdem die Stützkonstruktion herausgezogen wurde, kann die Technologie des Recyclings realisiert werden, was die Nutzungsrate von Ressourcen verbessert und den Verbrauch von Einwegmaterialien so weit wie möglich verringert;
4. 4. für den Abstand der Stützkonstruktionen können eine strukturelle Berechnung und Anpassung entsprechend der Tiefe der Baugrube durchgeführt werden, wodurch einen gute Anpassungsfähigkeit erzielt wird.

The present invention has the following advantages:

1. 1. The project cost is low and the construction period is short; with this excavation support method, the project cost is reduced by at least 40% compared to the process of over-excavation, replacement filling and reverse trenching, and multiple work surfaces can be started at the same time, saving construction time and causing no environmental pollution;
2. 2. small footprint, strong adaptability to the surrounding terrain, and high security; it is basically not restricted by the surrounding terrain and buildings, and the excavation is carried out only after the excavation support is completed, thereby achieving good safety, and the surrounding roads and buildings are not affected;
3. 3. after the supporting structure is pulled out, the technology of recycling can be realized, which improves the utilization rate of resources and reduces the consumption of disposable materials as much as possible;
4. 4. For the spacing of the supporting structures, structural calculation and adjustment can be made according to the depth of the excavation, achieving good adaptability.

character list

• 1 zeigt ein schematisches Strukturdiagramm in einer Draufsicht des ersten Ausführungsbeispiels;
• 2 zeigt ein schematisches Strukturdiagramm in einer Vorderansicht des ersten Ausführungsbeispiels;
• 3 zeigt ein schematisches Strukturdiagramm in einer Draufsicht des zweiten Ausführungsbeispiels;
• 4 zeigt eine schematische Vorderansicht der Teilschnittstruktur des zweiten Ausführungsbeispiels;
• 5 zeigt ein schematisches Strukturdiagramm in einer Teilschnittansicht des zweiten Ausführungsbeispiels;
• 6 zeigt ein schematisches Strukturdiagramm in teilweiser Draufsicht des zweiten Ausführungsbeispiels.

The present invention is explained in more detail below in connection with figures:

• 1 Fig. 12 is a schematic structural diagram in a plan view of the first embodiment;
• 2 Fig. 12 shows a schematic structural diagram in a front view of the first embodiment;
• 3 Fig. 12 is a schematic structural diagram in a plan view of the second embodiment;
• 4 Fig. 14 is a schematic front view of the partially sectional structure of the second embodiment;
• 5 Fig. 12 shows a schematic structural diagram in a partial sectional view of the second embodiment;
• 6 12 is a schematic structure diagram in partial plan view of the second embodiment.

reference list

1

sheet steel pole

2

protective tube

3

I steel

4

steel purlin

5

stone block

6

connection plate

7

plug-in plate

8th

Hydraulic splitting machine

DETAILED DESCRIPTION

• S1: geologische Erkundung, um die Position der Steinblöcke 5 auf dem Ausgrabungsweg der Baugrube;
• S2: Messen der Grenze der Baugrube und Positionieren durch Linien;
• S3: die Bohrmaschine bearbeitet die Steinblöcke 5 entlang der Grenze der Baugrubenstütze;
• S4: Ausheben des Oberflächenbodens, Installieren der Stahlpfette 4 und Eintreiben des Stahlblechpfahls 1 nach dem Anordnen der Stützkonstruktion in dem Bohrloch.

A method of supporting the construction pit under the geological condition of the soil layer mixed with stone blocks, comprising the following steps:

• S1: geological exploration to determine the position of the stone blocks 5 on the excavation path of the excavation pit;
• S2: measuring the boundary of the excavation and positioning by lines;
• S3: the boring machine machines the stone blocks 5 along the boundary of the excavation support;
• S4: Excavating the surface soil, installing the steel purlin 4 and driving the sheet steel pile 1 after placing the support structure in the borehole.

Two types of support structures are explained in more detail below:

Example 1

If the thickness of the stone blocks 5 is less than Im, a supporting structure made of the PE protective tube 2 and the I-steel 3 can be used, as in 1 and 2 shown, in the implementation, the stone block 5 is pierced by the drilling machine, then lubricating oil is smeared on the inner wall of the protective tube 2, and the protective tube is inserted into the borehole, the I-steel 3 is placed in the borehole, and the space between the I-steel 3 and the protective pipe 2 will be filled with cement slurry, after the cement slurry has hardened, earth or stone of about 50cm will be excavated on the surface of the soil layer, then the steel purlin 4 will be installed and the steel plate pile 1 will be driven in, after excavation of the excavation will be done the PE protective tube 2 and the I-steel 3 pulled out by a ram and reused.

Example 2

When the thickness of the stone blocks 5 is greater than Im and the drilling machine is relatively difficult to drill the stone blocks 5, a supporting structure composed of a plurality of insert plates 7, a connecting plate 6 and a steel protection tube 2 can be used, as in FIG 5 and 6 shown, in the implementation, the drilling machine first drills several large holes in the soil layer above the stone blocks, then the steel protection pipes 2 are inserted into the large holes, then small holes are drilled on the stone blocks 5, then hydraulic splitting machines are inserted into the small holes are inserted to split the stone blocks 2 to form a crack with a width of 2-3cm through the multiple hydraulic splitting machines 8, through the ram, first the respective insert plates 7 are inserted into the crack between two adjacent protective tubes 2, then the hydraulic splitting machines 8 and protective pipes 2 dismantled, and the connecting plate 6 is inserted into the crack between the insert plates 7, requiring the two sides of the insert plate 7 to be in the clamping grooves of the connecting plate 6, the stone blocks 5 and the soil layer 7 clamp the insert plates 7, then the steel plate pile 1 is driven through the ram and the steel purlin 4 is installed to complete the installation of the surrounding supports of the excavation.

Claims (5)

A method for supporting the excavation under the geological condition of the soil layer mixed with boulders, characterized in that it comprises the following steps: S1: geological exploration to determine the position of the boulders (5) on the excavation path of the excavation; S2: Measure and position the boundary of the excavation; S3: the boring machine machines the stone blocks (5) along the boundary of the excavation support; S4: Excavating the surface soil, installing the steel purlin (4) and driving the sheet steel pile (1) after placing the support structure in the borehole. Method of supporting the excavation pit in the geological condition of the soil layer mixed with stone blocks claim 1 , characterized in that when the above-mentioned step S3 is carried out, the borehole is required to pass through the stone blocks (5). Method of supporting the excavation pit in the geological condition of the soil layer mixed with stone blocks claim 2 , characterized in that the support structure comprises a protective tube (2) passing through the borehole, in which protective tube (2) an I-steel (3) is arranged, and the space between the I-steel (3) and the protective tube (2) is filled with cement slurry. Method of supporting the excavation pit in the geological condition of the soil layer mixed with stone blocks claim 1 , characterized in that when carrying out the above-mentioned step S3, after the drilling machine has first drilled a plurality of large holes in the soil layer above the stone blocks (5), the protective pipes (2) are inserted into the plurality of large holes, respectively, and then through the Protection pipes (2) are drilled through small holes in the stone blocks (5), and then hydraulic splitters (8) are inserted into the small holes to split the stone blocks (5) by the hydraulic splitters (8) to form a crack . Method of supporting the excavation pit in the geological condition of the soil layer mixed with stone blocks claim 4 , characterized in that the support structure comprises a plurality of insert plates (7) and a connecting plate (6), on the two sides of the connecting plate (6) being provided clamping grooves corresponding to the insert plates (7), and wherein after the hydraulic splitting machines ( 8) Splitting the stone blocks (5) to form a crack, the ram first inserts the respective insert plates (7) into the crack between two adjacent protective tubes (2), and then dismantles the hydraulic splitting machines (8) and the protective tubes (2). to insert the connecting plate (6) into the gap between the insert plates (7).

Images