CN112144545A

CN112144545A - Cantilever combined type foundation pit supporting mechanism and combined construction method

Info

Publication number: CN112144545A
Application number: CN202011165102.0A
Authority: CN
Inventors: 胡家平; 胡家旭; 刘代林
Original assignee: Shanghai Baolitong Foundation Engineering Co ltd
Current assignee: Shanghai Baolitong Foundation Engineering Co ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2020-12-29

Abstract

The invention discloses a cantilever combined type foundation pit supporting mechanism and a combined construction method, wherein the mechanism comprises a plurality of groups of vertical supporting piles and inclined supporting piles which are matched for use, wherein one pile side wall slot is formed in two opposite side walls of each vertical supporting pile in a staggered mode, the two staggered pile side walls are communicated, and the inclined supporting piles are matched to penetrate through the two pile side wall slots in an inclined mode; two beam crowns are arranged on the top ends of the multiple groups of vertical supporting piles and the oblique supporting piles in parallel, and a plurality of connecting beams are arranged between the two beam crowns in parallel to fix the vertical supporting piles and the oblique supporting piles. Through the combination of the vertical supporting piles and the oblique supporting piles, an integral stress system is formed, and no additional support is required to be arranged; the slant fender pile is all buried inside the soil body, so the earthwork excavation is comparatively convenient, and the vertical fender pile can adopt cantilever excavation.

Description

Cantilever combined type foundation pit supporting mechanism and combined construction method

Technical Field

The invention belongs to the field of building construction, and particularly relates to a cantilever combined type foundation pit supporting mechanism and a combined construction method.

Background

In the construction of the pile by the conventional SMW (soil Mixing wall) method, no additional connection exists between the H-shaped steel and the crown beam, and when the crown beam is subjected to a large vertical jacking force, the H-shaped steel can be separated from the crown beam.

When carrying out foundation ditch support system construction, conventional fender pile need set up horizontal brace or diagonal bracing, can cause the rise of cost like this on the one hand, and on the other hand, the existence of support can lead to the fact the hindrance to the earthwork excavation and the underground structure construction in later stage, slows down the construction progress.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a cantilever combined type foundation pit supporting mechanism and a combined construction method, namely, a combined type structure is provided, and the cantilever of the foundation pit is excavated by combining and assembling support piles to form a whole, so that the problems are solved.

The purpose of the invention is realized by adopting the following technical scheme:

a cantilever combined type foundation pit supporting mechanism comprises a plurality of groups of vertical supporting piles and inclined supporting piles which are matched for use, wherein a pile side wall slot is formed in two opposite side walls of each vertical supporting pile in a staggered mode, the two staggered pile side walls are communicated with each other, and the inclined supporting piles are matched and obliquely inserted into the two pile side wall slots; the top ends of the vertical supporting piles and the inclined supporting piles are parallelly provided with two beam crowns, and a plurality of connecting beams are parallelly arranged between the two beam crowns to fix the vertical supporting piles and the inclined supporting piles.

Preferably, a bottom sealing steel plate for plugging is arranged at the bottom of the vertical support pile.

Preferably, a breakable baffle is arranged on the opening groove of the side wall of the pile.

Preferably, the vertical support piles are hollow square steel.

Preferably, the oblique supporting piles are made of square steel or round steel.

The combined construction method of the supporting mechanism comprises the following steps: s1, driving vertical support piles, and driving a proper number of vertical support piles according to the position of the foundation pit; s2, driving the oblique supporting pile at a matched angle and distance according to the driven vertical supporting pile, and ensuring that the oblique supporting pile obliquely penetrates through the vertical supporting pile after being slotted through the side wall of the pile; s3, fixing the supporting piles, and filling micro-expansion concrete from the top of the vertical supporting pile to the inside so as to fix the vertical supporting pile and the inclined supporting pile into a whole; and S4, after the construction of a row of supporting piles is finished, pouring crown beams of reinforced concrete on the tops of the vertical supporting piles and the inclined supporting piles, and connecting the two crown beams together through connecting beams to finish the construction of the supporting mechanism.

Compared with the prior art, the invention has the beneficial effects that: can conveniently strut system construction and earthwork excavation through this scheme: 1, forming an integral stress system by combining vertical support piles and oblique support piles without arranging additional supports; 2, because the slant fender pile is whole to be buried inside the soil body, therefore the earthwork excavation is comparatively convenient, and vertical fender pile can adopt the cantilever excavation.

Drawings

Fig. 1 and 2 are schematic views of a vertical support pile;

FIG. 3 is a schematic view of a combination of vertical support piles and diagonal support piles;

FIG. 4 is a schematic view of the overall assembly of the support mechanism;

fig. 5 is a schematic application scenario section of the supporting mechanism.

In the figure: 1. vertically supporting piles; 2. grooving the side wall of the pile; 3. a baffle plate; 4. a bottom sealing steel plate; 5. obliquely supporting piles; 6. a crown beam; 7. and (5) connecting the beams.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

A cantilever combined type foundation pit supporting mechanism is disclosed, and referring to fig. 1-5, the mechanism comprises a plurality of groups of vertical supporting piles 1 and inclined supporting piles 5 which are matched for use, wherein one pile side wall slot 2 is formed in two opposite side walls of each vertical supporting pile 1 in a staggered mode, the two staggered pile side wall slots 2 are communicated, and the inclined supporting piles 5 are inserted into the two pile side wall slots 2 in a matched and inclined mode; the top ends of the vertical supporting piles 1 and the oblique supporting piles 5 are parallelly provided with two beam crowns 6, and a plurality of connecting beams 7 are parallelly arranged between the two beam crowns 6 to fix the vertical supporting piles 1 and the oblique supporting piles 5.

And a bottom sealing steel plate 4 for plugging is arranged at the bottom of the vertical support pile 1.

And a breakable baffle 3 is arranged on the pile side wall slot 2.

The vertical supporting piles 1 are made of hollow square steel.

The oblique supporting piles 5 are made of square steel or round steel.

Specifically, the side walls at two ends of the vertical supporting pile 1 are grooved to form pile side wall grooves 2 which are relatively staggered and run through, and the vertical supporting pile can be used for inserting the oblique supporting pile 5. Vertical fender pile 1 is squeezed into earlier during the construction, in order to avoid this in-process soil body to get into, sets up baffle 3 at the lateral wall both ends and seals, and the material of baffle 3 can adopt hard board or plastic slab, pastes on the lateral wall of vertical fender pile 1 to adopt back cover steel sheet 4 to carry out the back cover in the bottom. After the vertical supporting piles 1 are driven into the soil, the inclined supporting piles 5 are driven into the soil from one side at a certain angle, the inclined supporting piles 5 penetrate through the baffle 3 and then penetrate through the vertical supporting piles 1, and then the vertical supporting piles 1 are filled with micro-expansion concrete, so that the vertical supporting piles 1 and the inclined supporting piles 5 form a whole. After the construction of a row of supporting piles is finished, reinforced concrete crown beams 6 are poured on the tops of the supporting piles, and then the front crown beams and the rear crown beams 6 are connected together through connecting beams 7. Thus, the combined supporting structure is constructed, and cantilever excavation can be carried out on foundation pit engineering.

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 of ordinary skill in the art that: 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. The utility model provides a cantilever combination formula excavation supporting mechanism which characterized in that: the mechanism comprises a plurality of groups of vertical supporting piles (1) and inclined supporting piles (5) which are matched for use, wherein one pile side wall slot (2) is formed in two opposite side walls of each vertical supporting pile (1) in a staggered mode, the two staggered pile side wall slots (2) are communicated, and the inclined supporting piles (5) are inserted into the two pile side wall slots (2) in a matched, penetrating and inclined mode; the top parallel of the top of vertical supporting piles (1) and the top parallel of slant supporting piles (5) are provided with two beam crowns (6), and two parallel between the beam crowns (6) are provided with a plurality of connecting beams (7) to fix the vertical supporting piles (1) and the slant supporting piles (5).

2. The cantilever combined type foundation pit supporting mechanism according to claim 1, wherein: and a bottom sealing steel plate (4) for plugging is arranged at the bottom of the vertical support pile (1).

3. The cantilever combined type foundation pit supporting mechanism according to claim 1, wherein: and a breakable baffle (3) is arranged on the pile side wall slot (2).

4. The cantilever combined type foundation pit supporting mechanism according to claim 1, wherein: the vertical supporting piles (1) are made of hollow square steel.

5. The cantilever combined type foundation pit supporting mechanism according to claim 1, wherein: the oblique supporting piles (5) are made of square steel or round steel.

6. A method of assembling a retaining and protecting structure according to any one of claims 1 to 5, the method including:

s1, driving vertical supporting piles (1), and driving a proper number of vertical supporting piles (1) according to the position of the foundation pit;

s2, driving the oblique supporting pile (5) obliquely according to the driven vertical supporting pile (1) at a matched angle and distance, and ensuring that the oblique supporting pile (5) obliquely penetrates through the vertical supporting pile (1) after passing through the pile side wall slot (2);

s3, fixing the supporting piles, and filling micro-expansion concrete from the top of the vertical supporting pile (1) to the inside so as to fix the vertical supporting pile (1) and the oblique supporting pile (5) into a whole;

and S4, after the construction of a row of supporting piles is finished, pouring reinforced concrete crown beams (6) on the tops of the vertical supporting piles (1) and the inclined supporting piles (5), and then connecting the two crown beams (6) together through connecting beams (7) to finish the construction of the supporting mechanism.