CN217438953U - Impervious composite construction is strutted to strong permeable bed ground foundation ditch - Google Patents

Abstract

The utility model discloses a strong permeable bed foundation pit supporting prevention of seepage composite construction, double round mill cement impervious wall including the rectangle, the I-steel has been inserted at the double round mill cement impervious wall intermediate separation, mill cement impervious wall top at the double round around the double round, and the circle roof beam has been constructed on the double round mills cement impervious wall inner wall, the inboard of the circle roof beam at double round mill cement impervious wall top will surpass the double round and mill cement impervious wall inboard, it has vertical tie-beam to construct between each circle roof beam adjacent from top to bottom, and along its length direction equidistant horizontal braces of having arranged on every circle roof beam. The composite support structure is stable, can effectively support the foundation pit of the foundation with the strong permeable layer, and ensures the safety of the construction process of excavating the foundation pit and the underground structure.

Description

Impervious composite construction is strutted to strong permeable bed ground foundation ditch

Technical Field

The utility model belongs to the technical field of the excavation supporting, concretely relates to impervious composite construction is strutted to strong permeable bed ground foundation.

Background

The foundation pit supporting structure system generally comprises two parts, namely a soil retaining structure and a precipitation and water stopping system. Pile and wall type supporting structures often adopt steel sheet piles, reinforced concrete sheet piles, column-column type cast-in-place piles, underground continuous walls and the like. According to the soil condition and the size of the foundation pit, the foundation pit can be designed to be cantilever type, inner support type or anchor type. The gravity type supporting structure mostly adopts a cement soil mixing pile retaining wall, a soil nailing wall and the like. When the supporting structure can not play the role of water stop, a water stop curtain can be arranged or precipitation outside the pit is adopted at the same time so as to achieve the purpose of controlling underground water, so that the foundation pit earthwork engineering can be excavated under the dry operation condition.

Although the sheet pile type supporting structure can be suitable for various stratums, the pile and wall type supporting structures adopted in the highly permeable stratums have very high process requirements, and the construction effect of the seepage-proofing and water-stopping curtain needs to be enhanced, so that the construction cost is increased sharply. The underground continuous wall supporting system can be used for a foundation pit supporting structure of a strongly permeable stratum, but the construction cost is very high for a foundation pit of which the supporting structure is only temporarily supported, and the construction investment is not favorably controlled. Cement-soil mixing pile retaining wall, high-pressure rotary jet grouting pile retaining wall and other gravity retaining walls. The wall body mainly bears pressure, generally does not bear pulling force, and when the soil property condition is relatively poor, the excavation depth of the foundation pit should not be too large, and the foundation pit is suitable for small foundation pit engineering. When the soil quality condition is better, the cement-soil stirring process is limited in use.

The technology of double-wheel milling deep mixing wall is a novel construction method, and double-wheel milling deep mixing equipment comprises two types: the guide rod type double-wheel milling deep layer stirring equipment can achieve a cutting and stirring depth of 45m, and the suspension type double-wheel milling deep layer stirring equipment can achieve a cutting and stirring depth of 65 m.

The double-wheel milling deep-layer stirring impervious wall is formed by combining the technical characteristics of a hydraulic double-wheel slot milling machine and the traditional deep-layer stirring, and in the processes of tunneling grouting, air supply, milling, cutting and stirring, the two milling wheels oppositely rotate to mill a stratum; meanwhile, downward propelling force is applied through the Kaiser square guide rod, and downward tunneling and cutting are carried out. In the process, high-pressure gas and slurry are respectively injected into the groove through a gas supply and grouting system until the required design depth is reached. And then, the two milling wheels rotate oppositely in opposite directions, the milling wheels are lifted upwards slowly through the Kai's square guide rod, gas and curing liquid are respectively injected into the groove through a gas supply and grouting pipeline system and are mixed with the foundation soil in the groove, and therefore an impermeable body formed by the foundation soil, a curing agent, water, an additive and the like is formed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of prior art, provide a seepage prevention composite construction is strutted to strong permeable bed ground foundation ditch.

The utility model discloses a realize through following technical scheme:

a foundation pit supporting anti-seepage composite structure of a strong permeable stratum comprises a rectangular double-wheel milling cement soil impervious wall, I-shaped steel is inserted into the middle of the double-wheel milling cement soil impervious wall at intervals, ring beams are constructed on the top of the double-wheel milling cement soil impervious wall and the inner wall of the double-wheel milling cement soil impervious wall around the double-wheel milling cement soil impervious wall, the interval between the upper ring beam and the lower ring beam is 5-6m, the inner side of the ring beam at the top of the double-wheel milling cement soil impervious wall is required to exceed the inner side of the double-wheel milling cement soil impervious wall, vertical connecting beams are constructed between the upper ring beam and the lower ring beam which are adjacent, and horizontal supports are arranged on each ring beam at equal intervals along the length direction of the ring beam.

In the technical scheme, the top of the I-shaped steel is required to exceed the ring beam at the top of the double-wheel milling cement-soil impervious wall.

In the technical scheme, two ends of each horizontal support are respectively connected to two opposite long-edge beam bodies of the ring beam, so that the supporting effect is achieved.

In the technical scheme, a foundation pit floor is built at the bottom of the double-wheel milling cemented soil impervious wall, and a vertical supporting beam is built between the foundation pit floor and the last ring beam on the foundation pit floor.

In the technical scheme, the ring beam constructed on the inner wall of the double-wheel milling cement-soil impervious wall is a reinforced concrete beam, and the reinforcing steel bars of the ring beam are driven into the double-wheel milling cement-soil impervious wall, so that the connection strength between the ring beam and the inner wall of the double-wheel milling cement-soil impervious wall is increased.

In the technical scheme, the vertical connecting beam is tightly attached to the inner wall of the double-wheel milling cement-soil impervious wall, the vertical connecting beam is made of reinforced concrete, and the reinforcing steel bars of the vertical connecting beam are driven into the double-wheel milling cement-soil impervious wall.

In the technical scheme, the vertical supporting beam is tightly attached to the inner wall of the double-wheel milling cement-soil impervious wall, the vertical supporting beam is made of reinforced concrete, and reinforcing steel bars of the vertical supporting beam are driven into the double-wheel milling cement-soil impervious wall.

In the technical scheme, the horizontal supports are made of reinforced concrete or steel pipes, and the distance between every two adjacent horizontal supports on the same horizontal plane is preferably 8-10 m.

In the technical scheme, the number of the ring beams on the inner wall of the cement-soil diaphragm wall is 3-5 by double-wheel milling, and the distance along the depth direction is 5-6 m.

Compared with the prior art, the utility model, have following advantage and beneficial effect:

the utility model discloses constructed multichannel collar tie beam on double round mills soil cement cut-off wall basis, set up vertical connection and a supporting beam between each collar tie beam to along its length direction equidistant horizontal braces that arranges on every collar tie beam. The composite support structure is stable, can effectively support the foundation pit of the foundation with the strong permeable layer, and ensures the safety of the construction process of excavating the foundation pit and the underground structure.

The cutter of the double-wheel milling head is made of alloy materials and diamonds, a proper cutter can be selected according to different geological stratum conditions, the double-wheel milling head can dig a soil layer, a sand layer, a gravel layer and a weathered rock layer, and the field adaptability is strong.

A double-wheel milling deep stirring and I-steel composite vertical supporting structure belongs to a semi-rigid supporting structure, is applicable to various stratums and cannot be damaged by brittle fracture.

I-shaped steel in the double-wheel milling deep stirring and I-shaped steel composite vertical supporting structure can be recycled after the construction of an underground structure is finished, so that the engineering investment is saved, and the double-wheel milling deep stirring and I-shaped steel composite vertical supporting structure is a low-carbon environment-friendly foundation pit supporting structure.

Drawings

Fig. 1 is a top view of a foundation pit supporting impermeable composite structure of a highly permeable stratum.

Fig. 2 is a sectional view of the permeable and strongly permeable layer foundation pit supporting impermeable composite structure shown in fig. 1 in the direction of a.

Fig. 3 is a B-direction sectional view of the impermeable composite structure of the foundation pit support of the highly permeable foundation shown in fig. 1.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical field person understand the solution of the present invention better, the technical solution of the present invention is further described below with reference to the specific embodiments.

Referring to attached drawings 1-3, a strong permeable stratum foundation pit supporting anti-seepage composite structure is characterized in that a rectangular double-wheel milling cement soil anti-seepage wall 1 is constructed on a foundation pit site to be excavated, the depth of the double-wheel milling cement soil anti-seepage wall 1 is equal to that of a foundation pit, I-shaped steel 2 is inserted into the double-wheel milling cement soil anti-seepage wall at intervals, ring beams 3.1-3.4 are constructed on the top of the double-wheel milling cement soil anti-seepage wall and the inner wall of the double-wheel milling cement soil anti-seepage wall around the double-wheel milling cement soil anti-seepage wall, the interval between the upper and lower adjacent ring beams is 5-6m, the inner side of the ring beam at the top of the double-wheel milling cement soil anti-seepage wall needs to exceed the inner side of the double-wheel milling cement soil anti-seepage wall, vertical connecting beams 5.1-5.3 are constructed between the upper and lower adjacent ring beams, and horizontal supports 4.1-4.4 are arranged on each ring beam at equal intervals along the length direction; in addition, a foundation pit floor 6 is built at the bottom of the double-wheel milling cemented soil impervious wall, and a vertical supporting beam 5.4 is built between the foundation pit floor and the last ring beam on the foundation pit floor.

The construction method of the impermeable composite structure for foundation pit support of the highly permeable layer foundation of the utility model is explained below by taking a certain building site stratum as an example. The ground layer of a certain building site comprises sand, pebble gravel, fully weathered rock, strongly weathered rock, stroke rock, breezy rock and unsprung rock from top to bottom, the underground water level is 3m below the ground, the building requirements are that the excavation depth of a foundation pit is 20m, the foundation pit is rectangular, and the size of the foundation pit is 200m x 20 m.

The construction method of the impermeable composite structure for the foundation pit support of the highly permeable layer foundation comprises the following specific steps:

step one, leveling a building structure field, and removing earth surface vegetation and building rubbish.

And step two, positioning double-wheel milling equipment, and testing piles according to the soil property of the stratum to determine construction parameters such as cement mixing amount, stirring speed and the like.

Thirdly, dividing the double-wheel milling cement soil impervious wall into a plurality of groove sections according to the shape and the size of a foundation pit to be excavated (the foundation pit in the embodiment is rectangular, and the size is 200m x 20m), numbering the groove sections 1,2,3,4 and 5 … … in sequence, and adopting a reciprocating construction process, namely constructing the groove sections 1, 3 and 5 first, and then constructing the groove sections … … 2, 4 and 6, wherein the interval time between the sequence I and the sequence II is less than or equal to 12 h; the length of each groove section is 2800mm, and the lap joint length is not less than 300 mm; the wall body of the double-wheel milling cemented soil impervious wall is 100cm in thickness, and the depth of the wall body is 1m when the wall body enters the strongly weathered rock.

And step four, after the construction of each double-wheel milling cemented soil impervious wall groove section is finished, vertically inserting two I-beams 2 with the length of 23m into the double-wheel milling cemented soil impervious wall, preferably inserting two I-beams into each double-wheel milling cemented soil impervious wall groove section, wherein the interval between the two I-beams is 1250mm, and coating a lubricant or a plastic film on the surfaces of the I-beams.

After all the double-wheel milling cemented soil impervious walls and the I-beams are constructed, pouring and constructing a first ring beam 3.1 at the top of the double-wheel milling cemented soil impervious wall around the constructed rectangular double-wheel milling cemented soil impervious wall 1, wherein the top of the I-beams 2 exceeds the first ring beam; the first ring beam 3.1 is made of reinforced concrete, the cross section is rectangular, the size of the cross section is 80cm in height and 120cm in width, namely, the inner side of the first ring beam 3.1 exceeds the inner side of the double-wheel milling cement-soil impervious wall 1 by 20 cm.

And step six, after the cement-soil impervious wall and the first ring beam are milled in the double-wheel mode, arranging a first layer of horizontal supports 4.1 on the rectangular first ring beam 3.1 at equal intervals along the length direction of the rectangular first ring beam, wherein the distance between every two adjacent horizontal supports is preferably 10m, each horizontal support is horizontally arranged between two opposite long-edge beam bodies of the rectangular first ring beam, namely two ends of each horizontal support are respectively connected to the two opposite long-edge beam bodies of the rectangular first ring beam, and a supporting effect is achieved.

And seventhly, excavating a foundation pit after the first layer of horizontal support is constructed.

Step eight, when the foundation pit is excavated to the depth of 5m, constructing a second ring beam 3.2 on the inner wall of the double-wheel milling cemented soil impervious wall at the position of 5m by surrounding the rectangular double-wheel milling cemented soil impervious wall 1, wherein the second ring beam 3.2 is a reinforced concrete beam, the reinforcing steel bars are driven into the double-wheel milling cement-soil impervious wall, so that the connection strength between the second ring beam 3.2 and the inner wall of the double-wheel milling cement-soil impervious wall is increased, and in addition, in order to prevent the second ring beam 3.2 from falling off, a vertical connecting beam 5.1 is also required to be constructed between the second ring beam 3.2 and the part of the first ring beam 3.1, which exceeds the inner side of the double-wheel milling cement impervious wall, a second ring beam 3.2 is hung through the vertical connecting beams, the cross section size of each vertical connecting beam is 30cm to 20cm, the number of the vertical connecting beams is multiple, the vertical connecting beams are arranged at intervals of 10m, the vertical connecting beams are tightly attached to the inner wall of the double-wheel milling cement-soil impervious wall, and preferably, reinforcing steel bars of the vertical connecting beams are also driven into the double-wheel milling cement-soil impervious wall; a second layer of horizontal supports 4.2 is then arranged on the second ring beam 3.2 at equal intervals along its length.

Step nine, when the foundation pit is excavated to the depth of 10m, a third ring beam 3.3 is constructed on the inner wall of the double-wheel milling cemented soil impervious wall around the rectangular double-wheel milling cemented soil impervious wall 1 at the position of 10m, the third ring beam 3.3 is a reinforced concrete beam, and reinforcing steel of the third ring beam is driven into the double-wheel milling cemented soil impervious wall, so that the connection strength between the third ring beam 3.3 and the inner wall of the double-wheel milling cemented soil impervious wall is increased, and in addition, in order to prevent the third ring beam 3.3 from falling off, a vertical connecting beam 5.2 is also required to be constructed between the third ring beam 3.3 and the second ring beam 3.2; a third layer of horizontal supports 4.3 is then arranged on the third ring beam 3.3 at equal intervals along its length.

Step ten, when the foundation pit is excavated to the depth of 15m, a fourth ring beam 3.4 is constructed on the inner wall of the double-wheel milling cement-soil impervious wall at the position of 10m around the rectangular double-wheel milling cement-soil impervious wall 1, the fourth ring beam 3.4 is a reinforced concrete beam, and reinforcing steel of the fourth ring beam is driven into the double-wheel milling cement-soil impervious wall, so that the connection strength between the fourth ring beam 3.4 and the inner wall of the double-wheel milling cement-soil impervious wall is increased, and in addition, in order to prevent the fourth ring beam 3.4 from falling off, a vertical connecting beam 5.3 is also required to be constructed between the fourth ring beam 3.4 and the third ring beam 3.3; a fourth layer of horizontal supports 4.4 is then arranged on the fourth ring beam 3.4 at equal intervals along its length.

Step eleven, excavating to the bottom of a foundation pit, pouring a foundation pit floor 6, and constructing a vertical supporting beam 5.4 between the foundation pit floor 6 and a fourth ring beam 3.4 (the vertical supporting beam is tightly attached to the inner wall of the double-wheel milling cement-soil impervious wall, preferably, reinforcing steel bars of the vertical supporting beam are also driven into the double-wheel milling cement-soil impervious wall); and then basement construction is carried out.

And step twelve, dismantling each layer of horizontal support from bottom to top step by step according to the construction progress of the underground structure.

And step thirteen, after the underground structure is constructed, the I-beams are pulled out one by using the jacks, and the I-beams can be recycled.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.

Claims (9)

1. The utility model provides a strong permeable bed foundation pit support prevention of seepage composite construction which characterized in that: the method comprises a rectangular double-wheel milling cement soil impervious wall, I-shaped steel is inserted into the double-wheel milling cement soil impervious wall at intervals, ring beams are constructed on the top of the double-wheel milling cement soil impervious wall and the inner wall of the double-wheel milling cement soil impervious wall around the double-wheel milling cement soil impervious wall, the interval between every two adjacent ring beams is 5-6m, the inner side of the ring beam at the top of the double-wheel milling cement soil impervious wall is required to exceed the inner side of the double-wheel milling cement soil impervious wall, vertical connecting beams are constructed between every two adjacent ring beams, and horizontal supports are arranged on each ring beam at equal intervals along the length direction of the ring beam.

2. The permeable stratum foundation pit supporting prevention of seepage composite construction of claim 1, characterized in that: the top of the I-shaped steel is required to exceed the ring beam on the top of the double-wheel milling cement-soil impervious wall.

3. The permeable stratum foundation pit supporting prevention of seepage composite construction of claim 1, characterized in that: two ends of each horizontal support are respectively connected to two opposite long-edge beam bodies of the ring beam.

4. The permeable stratum foundation pit supporting prevention of seepage composite construction of claim 1, characterized in that: a foundation pit floor is built at the bottom of the double-wheel milling cemented soil diaphragm wall, and a vertical supporting beam is built between the foundation pit floor and the last ring beam on the foundation pit floor.

5. The permeable stratum foundation pit supporting prevention of seepage composite construction of claim 1, characterized in that: and the ring beam constructed on the inner wall of the double-wheel milling cement-soil impervious wall is a reinforced concrete beam, and the reinforcing steel bars of the ring beam are driven into the double-wheel milling cement-soil impervious wall.

6. The permeable stratum foundation pit supporting prevention of seepage composite construction of claim 1, characterized in that: the vertical connecting beam is tightly attached to the inner wall of the double-wheel milling cement soil impervious wall, the vertical connecting beam is made of reinforced concrete, and reinforcing steel bars of the vertical connecting beam are to be driven into the double-wheel milling cement soil impervious wall.

7. The permeable stratum foundation pit supporting prevention of seepage composite construction of claim 4 characterized in that: the vertical supporting beam is tightly attached to the inner wall of the double-wheel milling cemented soil impervious wall, the vertical supporting beam is made of reinforced concrete, and reinforcing steel bars of the vertical supporting beam are required to be driven into the double-wheel milling cemented soil impervious wall.

8. The permeable stratum foundation pit supporting prevention of seepage composite construction of claim 1, characterized in that: the horizontal supports are made of reinforced concrete or steel pipes, and the distance between every two adjacent horizontal supports on the same horizontal plane is 8-10 m.

9. The permeable stratum foundation pit supporting prevention of seepage composite construction of claim 1, characterized in that: the number of the ring beams on the inner wall of the double-wheel milling cement-soil impervious wall is 3-5, and the distance along the depth direction is 5-6 m.

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