CN113846653A

CN113846653A - Prefabricated test block back pressure foundation pit support system and construction method

Info

Publication number: CN113846653A
Application number: CN202111363853.8A
Authority: CN
Inventors: 周治国; 孙晓立; 杨军; 胡良军; 夏红兵; 杜永潇; 李亚峰; 李皓; 董耀俊; 古爱媚; 杨丹; 来静
Original assignee: Guangdong Yueneng Engineering Management Co ltd; Guangzhou Municipal Engineering Testing Co
Current assignee: Guangdong Yueneng Engineering Management Co ltd; Guangzhou Municipal Engineering Testing Co
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2021-12-28

Abstract

The invention provides a supporting system of a prefabricated test block back pressure foundation pit and a construction method thereof, wherein the supporting system comprises the following steps: the system comprises a plurality of supporting piles, a plurality of prefabricated test blocks, a plurality of soil remaining areas and a concrete bottom plate; the supporting piles are distributed along the circumferential direction of the foundation pit; the concrete bottom plate is positioned at the bottom of the foundation pit and has a distance with the support piles; the prefabricated test blocks and the soil remaining area are located between the support piles and the concrete bottom plate and are alternately arranged at intervals along the circumferential direction of the foundation pit. According to the prefabricated test block back-pressure foundation pit supporting system, the plurality of supporting piles, the plurality of prefabricated test blocks, the plurality of soil remaining areas and the concrete bottom plate are arranged, so that back pressure can be formed on a foundation pit by means of the prefabricated test blocks, the foundation pit collapse is avoided, and a sufficient supporting effect is provided for the foundation pit; meanwhile, the prefabricated test block back pressure foundation pit supporting system is simple in structure, low in manufacturing cost and short in construction period.

Description

Prefabricated test block back-pressure foundation pit supporting system and construction method

Technical Field

The invention relates to the technical field of building construction, in particular to a prefabricated test block back-pressure foundation pit supporting system and a construction method.

Background

During the construction of the foundation pit, in order to retain soil and stop water so as to ensure the safety of the surrounding environment of the foundation pit, the foundation pit needs to be protected by means of a plurality of supporting systems; however, the existing supporting system has the problems of high manufacturing cost, long construction period, limited supporting and protecting effects on the foundation pit, easiness in foundation pit collapse and the like.

Disclosure of Invention

To achieve the above and other related objects, the present invention provides a prefabricated test block back pressure foundation pit supporting system, comprising: the system comprises a plurality of supporting piles, a plurality of prefabricated test blocks, a plurality of soil remaining areas and a concrete bottom plate; the supporting piles are distributed along the circumferential direction of the foundation pit; the concrete bottom plate is positioned at the bottom of the foundation pit and has a distance with the support piles; the prefabricated test blocks and the soil remaining area are located between the support piles and the concrete bottom plate and are alternately arranged at intervals along the circumferential direction of the foundation pit.

Optionally, the pre-fabricated test block is stepped.

Optionally, the precast test block is a precast concrete block.

Optionally, the support piles are concrete piles. .

Optionally, reinforced soil is filled between adjacent support piles.

Optionally, the top surface of the soil retention area is an inclined surface.

The invention also provides a construction method based on the prefabricated test block back-pressure foundation pit supporting system, which comprises the following steps:

constructing the supporting pile;

placing the slope and digging to the bottom of the pit to form a foundation pit with a soil slope;

forming the concrete bottom plate at the bottom of the foundation pit;

excavating the soil slopes at intervals to form the soil remaining areas, and forming first excavation pits between the adjacent soil remaining areas;

filling prefabricated test blocks in the first excavation to form back pressure;

excavating and removing the soil remaining area to form a second excavation pit, and forming a first concrete plate in the second excavation pit;

and hoisting the precast test block to form a third pit, and forming a second concrete plate in the third pit.

Optionally, the depth of the foundation pit is less than 6 meters.

Optionally, the depth of the foundation pit is 6 meters to 10 meters, and the construction of the support pile further comprises: and (6) slope relief is carried out.

As mentioned above, the prefabricated test block back-pressure foundation pit supporting system and the construction method have the following beneficial effects: according to the prefabricated test block back-pressure foundation pit supporting system, the plurality of supporting piles, the plurality of prefabricated test blocks, the plurality of soil remaining areas and the concrete bottom plate are arranged, so that back pressure can be formed on a foundation pit by means of the prefabricated test blocks, the foundation pit collapse is avoided, and a sufficient supporting effect is provided for the foundation pit; meanwhile, the prefabricated test block back pressure foundation pit supporting system is simple in structure, low in manufacturing cost and short in construction period.

Drawings

Fig. 1 is a schematic top view of a prefabricated test block back-pressure foundation pit supporting system in a foundation pit with a depth of less than 6m in the first embodiment of the invention.

Fig. 2 is a cross-sectional view taken along a line a-a of fig. 1 according to the present invention.

Fig. 3 is a cross-sectional view taken along the line B-B in fig. 1 according to the present invention.

Fig. 4 is a schematic top view of the prefabricated test block back-pressure foundation pit supporting system in a foundation pit with a depth of 6-10 m in the first embodiment of the invention.

Fig. 5 is a cross-sectional view taken along the line C-C of fig. 4 in accordance with the present invention.

Fig. 6 is a cross-sectional view taken along the direction D-D in fig. 4 according to the present invention.

Fig. 7 is a flowchart of a construction method according to a second embodiment of the present invention.

Element number description:

1. the method comprises the following steps of supporting piles, 2, soil remaining areas, 3, concrete bottom plates, 4 and prefabricated test blocks.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.

The existing support system has the problems of high manufacturing cost, long construction period, limited support protection effect on the foundation pit, easiness in foundation pit collapse and the like.

Example one

Referring to fig. 1 to 6, the present invention provides a prefabricated test block back-pressure foundation pit supporting system, which includes: the system comprises a plurality of supporting piles 1, a plurality of prefabricated test blocks 4, a plurality of soil remaining areas 2 and a concrete bottom plate 3; a plurality of the support piles 1 are distributed along the circumferential direction of a foundation pit (not shown); the concrete bottom plate 3 is positioned at the bottom of the foundation pit and has a distance with the support piles 1; the precast test blocks 4 and the soil remaining area 2 are located between the support piles 1 and the concrete bottom plate 3 and are alternately arranged at intervals along the circumferential direction of the foundation pit.

According to the prefabricated test block back-pressure foundation pit supporting system, the plurality of supporting piles 1, the plurality of prefabricated test blocks 4, the plurality of soil remaining areas 2 and the concrete bottom plate 3 are arranged, so that back pressure can be formed on a foundation pit by means of the prefabricated test blocks 4, the foundation pit is prevented from collapsing, and a sufficient supporting effect is provided for the foundation pit; meanwhile, the prefabricated test block back pressure foundation pit supporting system is simple in structure, low in manufacturing cost and short in construction period.

In one example, as shown in fig. 1 to 3, the prefabricated block back-pressure foundation pit supporting system can be located in a foundation pit with a depth of less than 6m, and the pile top of the supporting pile 1 is flush with the ground.

In another example, as shown in fig. 4 to 6, the prefabricated block back-pressure foundation pit supporting system can be located in a foundation pit with a depth of 6m to 10m, and the pile top of the supporting pile 1 is lower than the ground.

As an example, as shown in fig. 3 and 6, the pre-test block 4 is stepped; specifically, the thickness of the precast block 4 may be reduced from the edge of the foundation pit to the bottom of the foundation pit in a stepped manner.

More specifically, the precast test blocks 4 are in a ladder shape, in this embodiment, the precast test blocks 4 are stacked in a ladder shape, that is, multiple layers of precast concrete blocks are stacked to form a ladder shape, one side close to the support pile 1 is stacked with three layers of precast concrete blocks, two layers of precast concrete blocks are stacked in sequence, and one layer of precast concrete block is laid.

As an example, the precast block 4 may be a precast concrete block.

As an example, the support pile 1 may be a concrete pile.

As an example, reinforced soil is filled between adjacent ones of the support piles 1.

As shown in fig. 2 and 5, the top surface of the soil retention area 2 is an inclined surface.

Specifically, in the present embodiment, the inclined surface of the top surface of the soil retention area 2 extends from the ground surface to the bottom surface of the foundation pit.

Example two

Referring to fig. 7 in conjunction with fig. 1 to 6, this embodiment further provides a construction method based on the prefabricated test block back-pressure foundation pit supporting system in the first embodiment, where the construction method includes the following steps:

s1: constructing the supporting pile 1;

s2: placing the slope and digging to the bottom of the pit to form a foundation pit with a soil slope;

s3: forming the concrete bottom plate 3 at the bottom of the foundation pit;

s4: excavating the soil slopes at intervals to form the soil remaining areas 2, and forming first excavation pits between the adjacent soil remaining areas 2;

s5: filling the prefabricated test block 4 in the first excavation to form back pressure;

s6: excavating and removing the soil remaining area 2 to form a second excavation, and forming a first concrete plate in the second excavation;

s7: and (4) hoisting the precast test block 4 to form a third pit, and forming a second concrete plate in the third pit.

As an example, as shown in fig. 1 to 3, the depth of the foundation pit is less than 6 meters.

Specifically, the depth of the foundation pit can be 3 meters, 4 meters or 5 meters, and the like.

As an example, as shown in fig. 4 to 6, the depth of the foundation pit is 6 meters to 10 meters, and before the constructing of the support piles, the method further includes: and (6) slope relief is carried out.

Specifically, as shown in fig. 5, the depth of the foundation pit may be 7 meters, 8 meters, or 9 meters, and the like, and the slope is set before the foundation pit is excavated.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. the support system of a prefabricated test block back pressure foundation pit, is characterized in that, comprises: a plurality of support piles, a plurality of prefabricated test blocks, a plurality of soil retention areas and a concrete base plate; a plurality of the described support piles distributed along the circumference of the foundation pit; the concrete bottom plate is located at the bottom of the foundation pit and has a distance from the support pile; the prefabricated test block and the soil retention area are located between the support pile and the support pile between the concrete bottom plates and alternately spaced along the circumference of the foundation pit.

2 . The prefabricated test block back pressure foundation pit support system according to claim 1 , wherein the prefabricated test block is stepped. 3 .

3 . The prefabricated test block back pressure foundation pit support system according to claim 1 , wherein the prefabricated test block is a prefabricated concrete block. 4 .

4 . The prefabricated test block back pressure foundation pit support system according to claim 1 , wherein the support piles are concrete piles. 5 .

5 . The prefabricated test block back pressure foundation pit support system according to claim 1 , wherein the adjacent support piles are filled with reinforced soil. 6 .

6 . The prefabricated test block back pressure foundation pit support system according to claim 1 , wherein the top surface of the soil retention area is an inclined surface. 7 .

7. A construction method based on the prefabricated test block back pressure foundation pit support system according to any one of claims 1 to 6, comprising the steps:

constructing the supporting piles;

The foundation pit with soil slope is formed by grading and digging to the bottom of the pit;

forming the concrete floor at the bottom of the foundation pit;

excavating the soil slope at intervals to form the soil retaining area, and forming a first excavation pit between adjacent soil retaining areas;

Filling the prefabricated test block in the first dig pit to form a back pressure;

excavating and removing the soil retention area to form a second excavation pit, and forming a first concrete slab in the second excavation pit;

The prefabricated test block is hoisted away to form a third excavation pit, and a second concrete slab is formed in the third excavation pit.

8. The construction method according to claim 7, wherein the depth of the foundation pit is less than 6 meters.

9 . The construction method according to claim 7 , wherein the depth of the foundation pit is 6 meters to 10 meters, and before the construction of the supporting piles, the method further comprises: grading. 10 .