CN114197482A - Water-stopping and supporting integrated foundation pit retaining structure and construction method - Google Patents

Abstract

The invention relates to a water-stopping and supporting integrated foundation pit retaining structure and a construction method, which are used for being arranged at the junction of a foundation pit and the ground, wherein the foundation pit is concavely arranged under the ground and comprises a plurality of straight piles, a plurality of inclined piles and a top beam; it is a plurality of the vertical pile is followed the marginal hoop interval distribution of foundation ditch and ground juncture, it is a plurality of the lower extreme of vertical pile is vertical to be inserted subaerially, just the level of vertical pile lower extreme is less than the level of foundation ditch diapire, it is a plurality of the level of vertical pile upper end is between the level of foundation ditch diapire and the level of ground, just the underground on ground is located arbitrary adjacent two be connected with the water-stop curtain that vertical direction set up between the vertical pile. The vertical piles and the inclined piles are integrated through the top beams, the supporting cost of the foundation pit is reduced, the vertical piles and the inclined piles are locally combined, the stability and the supporting strength of the retaining structure are improved, and the construction is convenient and rapid.

Description

Water-stopping and supporting integrated foundation pit retaining structure and construction method

Technical Field

The invention relates to the field of building construction, in particular to a water-stopping and supporting integrated foundation pit retaining structure and a construction method.

Background

The waterproof curtain refers to a concept, is the general name of a series of water stops at the periphery of an engineering main body, is used for preventing or reducing continuous water stop bodies adopted by underground water flowing into a foundation pit from the side wall of the foundation pit and the bottom of the foundation pit, and is divided into 3 parts by the enclosure of the foundation pit, wherein the first part is a retaining pile part which mainly plays the role of a retaining wall, the form of the retaining pile can be a reinforced concrete cast-in-place pile or other forms of piles, and a certain gap is formed between the piles, but the retaining wall can be realized; the second part is a waterproof curtain part which is used for solidifying soil behind the retaining wall and blocking water layer communication inside and outside the foundation pit, and the waterproof curtain part can be in a cement soil mixing pile or compaction grouting form; the third part is a support, and the underground continuous wall is another form of foundation pit enclosure and is mainly used for deep and large foundation pits.

And be two mutually independent systems at traditional foundation ditch retaining structure and supporting construction, do not utilize each other, its supporting construction is unstable, and the construction is inconvenient, and is comparatively loaded down with trivial details.

Disclosure of Invention

In summary, in order to overcome the defects in the prior art, the invention provides a water-stopping and supporting integrated foundation pit retaining structure and a construction method.

The technical scheme for solving the technical problems is as follows: a water-stop support integrated foundation pit retaining structure and a construction method are used for being arranged at the junction of a foundation pit and the ground, the foundation pit is concavely arranged under the ground and comprises a plurality of vertical piles, a plurality of inclined piles and a top beam; the plurality of vertical piles are distributed at intervals along the circumferential direction of the edge of the junction of the foundation pit and the ground, the lower ends of the plurality of vertical piles are vertically inserted into the ground, the horizontal height of the lower ends of the vertical piles is lower than that of the bottom wall of the foundation pit, the horizontal height of the upper ends of the plurality of vertical piles is between that of the bottom wall of the foundation pit and that of the ground, a water-stop curtain arranged in the vertical direction is connected between any two adjacent vertical piles in the ground, and the upper end and the lower end of each water-stop curtain are flush with the upper end and the lower end of the two vertical piles on the two sides of the water-stop curtain; the top beam is buried under the ground, and the upper end of each straight pile is fixedly connected with the top beam; a plurality of batter pile and a plurality of the vertical pile one-to-one, every the batter pile slant inserts the underground on ground and is close to the correspondence the vertical pile, and every the upper end of batter pile is close to the correspondence the upper end of vertical pile, and with the back timber is connected fixedly.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the depth of the vertical piles embedded below the bottom of the foundation pit is 1/2-1/3 of the total length.

Furthermore, the inclined included angle between the inclined piles and the horizontal plane is 50-70 degrees.

The beneficial effect of adopting the further scheme is that: the strength of the retaining and supporting of the vertical piles and the inclined piles can be ensured by matching 1/2-1/3 with the total depth below the bottom of the foundation pit and the inclined angle of the inclined piles with the horizontal plane of 50-70 degrees.

Further, the waterproof curtain is planar or cambered, and when the waterproof curtain is cambered, the cambered opening of the waterproof curtain faces the foundation pit.

The beneficial effect of adopting the further scheme is that: the water-stopping effect of the water-stopping curtain can be improved by the water-stopping curtain being in the arc surface shape.

Further, the vertical piles and the inclined piles are ribbed high-pressure jet grouting piles, and the waterproof curtain is a high-pressure jet grouting pile occlusion continuous wall.

Further, the vertical piles and the inclined piles are steel sheet piles, and the waterproof curtain is a steel sheet occlusion continuous wall.

Further, the vertical piles and the inclined piles are cement mixing piles, and the waterproof curtain is a cement mixing pile occlusion continuous wall.

The beneficial effect of adopting the further scheme is that: can select different construction pile bodies according to actual construction conditions, like ribbed high pressure jet grouting pile, steel sheet pile or cement stirring stake, improve its practicality.

Further, the method comprises the following steps:

the method comprises the following steps: vertically inserting a plurality of vertical piles into the ground, wherein the plurality of vertical piles are circumferentially distributed on the ground at intervals, and the upper ends of the plurality of vertical piles are flush with the horizontal plane of the ground;

step two: digging an annular groove on the ground along the distribution track of the plurality of the straight piles, wherein the upper end of each straight pile is positioned in the annular groove;

step three: vertically and downwards inserting one water-stopping curtain into an annular groove between any two adjacent vertical piles, wherein two sides of the water-stopping curtain are fixedly connected with the corresponding vertical piles respectively;

step four: inserting the inclined piles into the ground obliquely above each straight pile, wherein the upper end of each inclined pile is positioned in the annular groove and close to the upper end of the corresponding straight pile;

step five: placing a steel reinforcement cage in the annular groove, pouring concrete to form a top beam, and connecting the upper ends of the plurality of straight piles with the upper ends of the plurality of inclined piles by the top beam;

step six: and digging a foundation pit in a corresponding area of the ground in the annular groove ring, wherein one side of the plurality of the vertical piles close to the inside of the foundation pit is exposed outside.

The beneficial effect of adopting the further scheme is that: the vertical piles and the inclined piles are rigidly connected by the top beams to form a triangular structure system, the triangular structures are arranged at intervals, and the triangular structures are connected into a whole by the waterproof curtain, so that the stability and the supporting strength of the support are greatly improved.

The invention has the beneficial effects that: the vertical piles and the inclined piles are integrated through the top beams, the foundation pit supporting cost is reduced, the vertical piles and the inclined piles are combined locally, the stability and the supporting strength of the supporting and retaining structure are greatly improved, the construction is convenient and rapid, the reliability of the supporting and retaining structure system is improved, and the supporting and retaining structure is convenient to popularize and apply.

Drawings

FIG. 1 is a top view of a retaining structure of the present invention;

fig. 2 is a side view structural diagram of the retaining structure of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a vertical pile; 2. oblique piles; 3. a top beam; 4. a waterproof curtain; 5. a foundation pit; 6. and (4) the ground.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1-2, a water-stop support integrated foundation pit retaining structure and a construction method thereof are used for being arranged at the junction of a foundation pit 5 and the ground 6, wherein the foundation pit 5 is concavely arranged below the ground 6 and comprises a plurality of vertical piles 1, a plurality of inclined piles 2 and a top beam 3; the waterproof curtain comprises a plurality of vertical piles 1, a plurality of waterproof curtains 4 and a plurality of waterproof curtains, wherein the vertical piles 1 are distributed along the edge ring direction of the junction of a foundation pit 5 and the ground 6 at intervals, the lower ends of the vertical piles 1 are vertically inserted below the ground 6, the horizontal height of the lower ends of the vertical piles 1 is lower than that of the bottom wall of the foundation pit 5, the horizontal height of the upper ends of the vertical piles 1 is between that of the bottom wall of the foundation pit 5 and that of the ground 6, the waterproof curtain 4 arranged in the vertical direction is connected between any two adjacent vertical piles 1 underground of the ground 6, and the upper end and the lower end of each waterproof curtain 4 are flush with the upper end and the lower end of the two vertical piles 1 on the two sides of each waterproof curtain 4; the top beam 3 is buried under the ground 6, and the upper end of each vertical pile 1 is fixedly connected with the top beam 3; a plurality of batter piles 2 and a plurality of vertical piles 1 one-to-one correspond, and every batter pile 2 slant inserts the underground of ground 6 and is close to corresponding vertical pile 1, and the upper end of every batter pile 2 is close to the upper end of corresponding vertical pile 1 to be connected fixedly with back timber 3.

Wherein, the depth of the vertical pile 1 embedded below the bottom of the foundation pit 5 is 1/2-1/3 of the total length. The vertical piles 1 are embedded below the bottom of the foundation pit 5 to 1/2-1/3 with the total length, so that the supporting strength of the vertical piles 1 can be ensured.

Wherein, the inclined included angle between the inclined pile 2 and the horizontal plane is 50-70 degrees. The supporting strength of the inclined pile 2 can be ensured by matching the inclined pile 2 with the horizontal plane at an inclined included angle of 50-70 degrees.

Wherein, the waterproof curtain 4 is plane or cambered surface shape, and when the waterproof curtain 4 is cambered surface shape, the cambered opening faces the foundation pit 5. The water stopping effect of the water stopping curtain 4 can be improved by the water stopping curtain 4 being in the cambered surface shape.

Preferably, in this embodiment, the vertical piles 1 and the inclined piles 2 are both ribbed high-pressure jet grouting piles, and the waterproof curtain 4 is a high-pressure jet grouting pile occlusive continuous wall.

Preferably, in this embodiment, the vertical piles 1 and the inclined piles 2 are steel sheet piles, and the waterproof curtain 4 is a steel sheet occlusive continuous wall.

Preferably, in this embodiment, the vertical piles 1 and the inclined piles 2 are cement mixing piles, and the waterproof curtain 4 is a cement mixing pile occlusive continuous wall. Can select different construction pile bodies according to the actual conditions of construction, like ribbed high pressure jet grouting pile, steel sheet pile or cement stirring stake, improve its practicality.

A construction method of a water-stop support and protection integrated foundation pit retaining structure comprises the following steps:

the method comprises the following steps: vertically inserting a plurality of vertical piles 1 into the ground 6, wherein the plurality of vertical piles 1 are circumferentially distributed on the ground 6 at intervals, and the upper ends of the plurality of vertical piles are flush with the horizontal plane of the ground 6;

step two: digging an annular groove on the ground 6 along the distribution track of a plurality of vertical piles 1, wherein the upper end of each vertical pile 1 is positioned in the annular groove;

step three: vertically and downwards inserting a waterproof curtain 4 into an annular groove between any two adjacent vertical piles 1, wherein two sides of the waterproof curtain 4 are fixedly connected with the corresponding vertical piles 1 respectively;

step four: inserting inclined piles 2 obliquely towards the ground 6 above each straight pile 1, wherein the upper end of each inclined pile 2 is positioned in the annular groove and close to the upper end of the corresponding straight pile 1;

step five: placing a steel reinforcement cage in the annular groove, pouring concrete to form a top beam 3, and connecting the upper ends of the plurality of straight piles with the upper ends of the plurality of inclined piles by the top beam;

step six: and digging a foundation pit 5 in a corresponding area of the ground 6 in the annular groove ring, wherein one side of the plurality of vertical piles 1, which is close to the inside of the foundation pit 5, is exposed outside.

When the vertical piles 1 and the inclined piles 2 are ribbed high-pressure jet grouting piles, reinforcing steel bars in the upper ends of the ribbed high-pressure jet grouting piles in the annular grooves can be knocked out, reinforcing cages are placed in the annular grooves, concrete is poured to form the top beam 3, the vertical piles 1, the inclined piles 2 and the top beam 3 are connected into a whole, and the supporting strength of the retaining structure is improved.

When the vertical piles 1 and the inclined piles 2 are steel sheet piles, the upper ends of the steel sheet piles in the annular grooves are welded by profile steels or connected by bolts to form rigid joints, then steel reinforcement cages are placed in the annular grooves, concrete is poured to form the top beams 3, and therefore the vertical piles 1, the inclined piles 2 and the top beams 3 are connected into a whole.

When the vertical piles 1 and the inclined piles 2 are cement mixing piles, the upper ends of the cement mixing piles in the annular grooves are knocked off, reinforcement cages are placed in the annular grooves, and concrete is poured to form the top beams 3.

According to the invention, the top beam 3 is integrated with the vertical piles 1 and the inclined piles 2, so that the supporting cost of the foundation pit is reduced, the combination of the vertical piles 1 and the inclined piles 2 is locally adopted, the stability and the supporting strength of the retaining structure are greatly improved, the construction is convenient and rapid, and the problem that the retaining structure and the supporting structure of the traditional device are two mutually independent systems and are not mutually utilized is solved.

Preferably, in this embodiment, the upper and lower ends of the waterproof curtain 4 are flush with the upper and lower ends of the two vertical piles 1 at both sides thereof.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. A water-stop support integrated foundation pit retaining structure is arranged at the junction of a foundation pit (5) and the ground (6), and the foundation pit (5) is concavely arranged below the ground (6), and is characterized by comprising a plurality of straight piles (1), a plurality of inclined piles (2) and a top beam (3);

the waterproof curtain comprises a plurality of vertical piles (1), a plurality of waterproof curtains (4) and a waterproof curtain, wherein the vertical piles (1) are distributed at intervals along the circumferential direction of the junction of the foundation pit (5) and the ground (6), the lower ends of the vertical piles (1) are vertically inserted below the ground (6), the horizontal height of the lower ends of the vertical piles (1) is lower than that of the bottom wall of the foundation pit (5), the horizontal height of the upper ends of the vertical piles (1) is between that of the bottom wall of the foundation pit (5) and that of the ground (6), the underground position of the ground (6) between any two adjacent vertical piles (1) is connected with the waterproof curtain (4) arranged in the vertical direction, and the upper end and the lower end of each waterproof curtain (4) are flush with the upper end and the lower end of the two vertical piles (1) on the two sides of the waterproof curtain (4);

the top beam (3) is buried under the ground (6), and the upper end of each vertical pile (1) is fixedly connected with the top beam (3);

a plurality of batter pile (2) and a plurality of vertical pile (1) one-to-one, every batter pile (2) slant inserts the underground of ground (6) and is close to the correspondence vertical pile (1), and every the upper end of batter pile (2) is close to the correspondence the upper end of vertical pile (1), and with back timber (3) are connected fixedly.

2. A water-stop support integrated foundation pit retaining structure according to claim 1, wherein the depth of the vertical pile (1) embedded below the bottom of the foundation pit (5) is 1/2-1/3 of the total length.

3. A water-stop support integrated foundation pit retaining structure according to claim 2, wherein the inclined angle between the inclined pile (2) and the horizontal plane is 50-70 °.

4. A water-stop supporting integrated foundation pit retaining structure according to claim 3, wherein the water-stop curtain (4) is planar or cambered, and when the water-stop curtain (4) is cambered, the cambered opening of the water-stop curtain faces the foundation pit (5).

5. A water-stop support integrated foundation pit retaining structure according to claim 4, wherein the vertical piles (1) and the inclined piles (2) are ribbed high-pressure jet grouting piles, and the water-stop curtain (4) is a high-pressure jet grouting pile occlusion continuous wall.

6. A water-stop support integrated foundation pit retaining structure according to claim 4, wherein the vertical piles (1) and the inclined piles (2) are steel sheet piles, and the water-stop curtain (4) is a steel sheet occlusion continuous wall.

7. A water-stop support integrated foundation pit retaining structure according to claim 4, wherein the vertical piles (1) and the inclined piles (2) are cement mixing piles, and the water-stop curtain (4) is a cement mixing pile occlusion continuous wall.

8. A construction method of the water stop support integrated foundation pit retaining structure as claimed in any one of claims 1 to 7, characterized by comprising the following steps:

the method comprises the following steps: vertically inserting a plurality of vertical piles (1) into the ground (6), wherein the plurality of vertical piles (1) are circumferentially distributed on the ground (6) at intervals, and the upper ends of the plurality of vertical piles are flush with the horizontal plane of the ground (6);

step two: digging an annular groove on the ground (6) along the distribution track of the plurality of the straight piles (1), wherein the upper end of each straight pile (1) is positioned in the annular groove;

step three: vertically and downwards inserting one waterproof curtain (4) into an annular groove between any two adjacent straight piles (1), wherein two sides of the waterproof curtain (4) are fixedly connected with the corresponding straight piles (1) respectively;

step four: inserting the inclined piles (2) obliquely towards the ground (6) above each straight pile (1), wherein the upper end of each inclined pile (2) is positioned in the annular groove and close to the upper end of the corresponding straight pile (1);

step five: placing a steel reinforcement cage in the annular groove, pouring concrete to form a top beam (3), and connecting the upper ends of the plurality of straight piles with the upper ends of the plurality of inclined piles by the top beam;

step six: and digging a foundation pit (5) in a corresponding area of the ground (6) in the annular groove ring, wherein one side of the plurality of vertical piles (1) close to the inside of the foundation pit (5) is exposed outside.

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