CN216041201U

CN216041201U - Earlier prop and dig double-deck diagonal bracing foundation ditch enclosure system afterwards

Info

Publication number: CN216041201U
Application number: CN202122146580.3U
Authority: CN
Inventors: 周玉石; 谢晓东; 谢益飞; 张群; 周磊; 刘泽海; 张亚风
Original assignee: Shanghai Chengdi Rock Soil Design Co ltd; Shanghai Chengdixiangjiang Data Technology Co ltd; Chengdi Construction Group Co ltd
Current assignee: Shanghai Teyu Technology Co ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2022-03-15
Anticipated expiration: 2031-09-07

Abstract

The utility model relates to a supporting-first-excavation double-layer inclined supporting foundation pit supporting system which comprises a vertical waterproof curtain and an inclined supporting structure, wherein the vertical waterproof curtain comprises a row of cement soil mixing piles, H-shaped sheet piles are inserted in the row of cement soil mixing piles, the H-shaped sheet piles are precast piles, the inclined supporting structure comprises an upper inclined pile and a lower inclined pile, the inclined piles are precast piles, and the inclined piles and the vertical waterproof curtain are connected through ring beams. The utility model greatly shortens the construction period, reduces the construction cost, has simple structure and large excavation space, and is particularly suitable for the deep foundation pit support of a two-storey basement.

Description

Earlier prop and dig double-deck diagonal bracing foundation ditch enclosure system afterwards

Technical Field

The utility model belongs to the technical field of foundation pit engineering, and particularly relates to a support-first-excavation double-layer inclined support foundation pit support system.

Background

The existing support type of the foundation pit of the two-layer basement is mainly composed of row piles and two supports, the horizontal support can be generally in the form of a reinforced concrete inner support or a steel support (a steel pipe support, an H-shaped steel support, a prestressed fish-belly sill inner support and the like), the lower part of the support is provided with stand columns which are different in support, the number of the stand columns is large or small, so that the construction operation surface of the foundation pit is narrow, the excavation of earthwork in the pit is difficult, the total construction period is seriously influenced, and the removal of the horizontal support is also a factor influencing the construction progress after the underground structure is constructed to a support replacement position; in addition, the horizontal support and the upright post pile have higher manufacturing cost. In summary, no economical, safe, energy-saving, environment-friendly and fast-construction enclosure mode exists in the foundation pit of the two-layer basement, and the utility model provides a possibility based on the aim.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a support-and-excavation double-layer inclined support foundation pit support system according to the defects of the prior art, the support-and-excavation double-layer inclined support foundation pit support system has the advantages of economy, safety, energy conservation, environmental protection, quick construction and the like, and the construction space in a foundation pit cannot be reduced, so that the construction period of the foundation pit is shortened while the construction cost is saved.

The utility model is realized by the following technical modes:

1. the utility model provides an earlier prop later and dig double-deck diagonal bracing foundation ditch enclosure system, enclosure system include vertical stagnant water curtain and slant supporting construction, vertical stagnant water curtain include one row of cement mixing pile, its interpolation H type sheet pile, H type sheet pile be the precast pile, slant supporting construction be upper and lower twice batter pile, the batter pile be the precast pile, adopt the collar tie beam to be connected between batter pile and the vertical stagnant water curtain.

2. The pile top of the batter pile is arranged in the ring beam.

3. The oblique angle of the oblique pile can be adjusted within 15-50 degrees.

4. The upper and lower layers of inclined piles are arranged in a staggered mode, and the distance between the upper and lower layers of inclined piles is 3-7 m.

5. The inclined pile is pressed in through an inclined pile pressing machine.

6. The construction method of the enclosure system comprises the following steps:

1) leveling a construction site, and releasing a real sample according to a construction drawing;

2) constructing a row of vertical cement-soil mixing piles and internally-inserted H-shaped plate piles;

3) obliquely pressing two oblique piles in the pile by using an oblique pile pressing machine;

4) excavating earth to a construction operation surface of the ring beam, and pouring the ring beam between the top of the upper layer of the inclined piles and the vertical waterproof curtain to enable the inclined piles and the vertical waterproof curtain to form a whole;

5) after the ring beam concrete reaches the design strength, excavating earthwork layer by layer to the next layer of inclined pile ring beam construction operation surface;

6) repeating the step 4), excavating earthwork in layers to the bottom of the foundation pit, and pouring a reinforcement cushion layer;

7) then constructing a ground warehouse structure (to +/-0.000);

8) constructing an outer wall of an underground structure for waterproofing, backfilling a gap between the outer wall and a containment to an inclined strut position, firstly cutting inclined piles between the outer wall and a waterproof curtain, and then cutting inclined piles in an underground chamber;

9) and after the oblique piles are cut off, continuously backfilling the earth to the ground.

Compared with the prior art, the utility model provides a construction method of a recyclable foundation pit support system with support before excavation, which has the following advantages:

1. the upper layer support of the foundation pit does not have any support and anchor cable, the excavation space is large, the excavation speed of the foundation pit is high, and a larger construction space is provided for other underground construction operations;

2. the H-shaped sheet pile and the inclined pile belong to prefabricated components, so that the strength is high, the mass production and the standardized production are realized, and the cost is low;

3. simple structure, the efficiency of construction is high.

Drawings

FIG. 1 is a schematic view of a double-layer inclined support foundation pit support system formed by firstly supporting and then excavating

1-ring beam 2-inclined pile 3-cement soil mixing pile 4-H type sheet pile 5-reinforcing bar cushion layer

Detailed Description

The utility model is described in detail with reference to the figures and the specific embodiments. The embodiments are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given below. The present invention is intended to be protected by the structural forms of the present invention itself, but the scope of the present invention is not limited to the following examples.

Examples

As shown in fig. 1, a prop earlier and dig double-deck diagonal bracing foundation ditch enclosure system afterwards, enclosure system include vertical waterproof curtain and slant supporting construction, vertical waterproof curtain include one row of cement mixing pile 3, its interpolation H template pile 4, slant supporting construction be upper and lower twice batter pile 2, the batter pile be the precast pile, adopt collar tie 1 to be connected between batter pile and the vertical waterproof curtain.

The utility model relates to a construction method for a support-first and excavation-later double-layer inclined support foundation pit support system, which comprises the following steps:

2) constructing a row of vertical cement mixing piles 3 and an inserted H-shaped plate pile 4;

3) obliquely pressing two oblique piles 2 into the pile by using an oblique pile press;

4) excavating earth to the construction operation surface of the ring beam 1, pouring the ring beam 1 between the top of the upper layer of inclined piles 2 and the vertical waterproof curtain, and enabling the inclined piles 2 and the vertical waterproof curtain to form a whole;

5) after the concrete of the ring beam 1 reaches the design strength, excavating earthwork layer by layer to the next layer of inclined piles 2 and constructing the operation surface of the ring beam 1;

6) repeating the step 4), excavating earthwork in layers to the bottom of the foundation pit, and pouring a reinforcement cushion layer 5;

7) then constructing a ground warehouse structure (to +/-0.000);

8) constructing an outer wall of an underground structure for waterproofing, backfilling a gap between the outer wall and a containment to an inclined strut position, firstly cutting an inclined pile 2 between the outer wall and a waterproof curtain, and then cutting an inclined pile 2 in an underground chamber;

9) and after the inclined piles 2 are cut off, earth is continuously backfilled to the ground.

Claims

2. The system of claim 1, wherein the batter pile is supported and then dug within a collar beam.

3. The foundation pit support system with the double-layer diagonal bracing structure, according to claim 1, wherein the diagonal angle of the diagonal piles can be adjusted within 15-50 °.

4. The foundation pit support system with the double-layer diagonal bracing structure, according to claim 1, is characterized in that the upper and lower inclined piles are arranged in a staggered manner, and the distance between the upper and lower inclined piles is 3-7 m.

5. The system of claim 1, wherein the slanted pile is pressed into the foundation pit by an oblique pile press.