CN110565669B

CN110565669B - Well pit water-intercepting and soil-retaining construction method

Info

Publication number: CN110565669B
Application number: CN201910864825.0A
Authority: CN
Inventors: 代旭升; 徐小明; 阚义森
Original assignee: BEIJING CHONGJIAN ENGINEERING CO LTD
Current assignee: BEIJING CHONGJIAN ENGINEERING CO LTD
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2022-02-18
Anticipated expiration: 2039-09-12
Also published as: CN110565669A

Abstract

The invention relates to the technical field of building construction, in particular to a well pit water-intercepting and soil-retaining construction method. The method comprises the following steps: measuring and determining a well pit side line; determining the lengths of the steel pipe and the steel plate according to the length of the sideline; burying a steel pipe and a steel plate at the determined corner of the well pit, wherein the length of the steel plate and the bottom of the steel pipe entering a water-resisting layer is more than or equal to a preset length; excavating earth in an area surrounded by the steel pipe and the steel plate; carrying out underground structure construction; and (5) dismantling the steel plate and the steel pipe. According to the well pit water-intercepting and soil-retaining construction method provided by the invention, the structure of the steel pipe and the steel plate is adopted, so that the water and soil loss of the side slope in the construction process can be prevented, and the construction period is saved. Because the construction is carried out by adopting the mode of earth excavation and downward pressing of the steel pipe and the steel plate, the labor of construction personnel is reduced, the repeated bottom cleaning work caused by unstable side slope can be prevented, the construction period is effectively shortened, the construction cost is saved, and the construction is safer and more reliable.

Description

Well pit water-intercepting and soil-retaining construction method

Technical Field

The invention relates to the technical field of building construction, in particular to a well pit water-intercepting and soil-retaining construction method.

Background

At present to in elevartor shaft, sump pit, tower crane foundation construction, because the underground part soil property major part that it is located belongs to unfavorable geological conditions such as fine sand, silt, silty clay or collapsible loess, consequently can the emergence in the basic construction process because piping, infiltration, the bank protection local that the quicksand caused collapses the scheduling problem unavoidably. At present, measures such as small steel pipes, wood templates or earth-retaining sandbags are usually adopted to reinforce the side slope, but the construction method usually consumes a large amount of manpower, material resources and financial resources, prolongs the construction period and has poor construction effect.

Therefore, a construction method for intercepting water and retaining soil in a pit is needed to solve the above technical problems.

Disclosure of Invention

The invention aims to provide a construction method for intercepting and retaining water in a well pit, which can shorten the construction period and save the construction cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

the well pit water interception and soil retaining construction method comprises the following steps:

measuring and determining a well pit side line;

determining the lengths of the steel pipe and the steel plate according to the length of the sideline;

burying a steel pipe and a steel plate at the determined corner of the well pit, wherein the length of the steel plate and the bottom of the steel pipe entering a water-resisting layer is more than or equal to a preset length;

excavating earth in an area surrounded by the steel pipe and the steel plate;

carrying out underground structure construction;

and (5) dismantling the steel plate and the steel pipe.

As a preferable technical scheme of the construction method for intercepting and retaining water of the well pit, when the ground layer is a silt layer, the vacuum dewatering perforated pipe is buried in the area enclosed by the steel pipe and the steel plate for dewatering before the earth is excavated.

As a preferable technical scheme of the construction method for intercepting and retaining water of the well pit, the steel plate is connected with the steel pipe in an inserting manner.

As a preferable technical scheme of the construction method for intercepting and retaining water of the well pit, three steel pipes are arranged at the corners of the well pit.

As an optimal technical scheme of the well pit water-intercepting and soil-retaining construction method, two steel pipes are arranged between the adjacent steel plates on the same side, the adjacent steel pipes are connected in a welding mode, and the lengths of the adjacent steel pipes are different.

As a preferable technical scheme of the construction method for intercepting and retaining water of the well pit, the steel plate and the steel pipe are pressed into the well pit to be dug through a hook machine.

As an optimal technical scheme of the well pit water interception and soil retaining construction method, the steel plate and the steel pipe are dismantled through a tower crane or a hook machine.

As a preferable technical scheme of the construction method for intercepting and retaining water of the well pit, each steel plate is provided with a lifting hole.

As a preferable technical scheme of the construction method for intercepting and retaining water in the pit, each steel pipe is provided with a dismantling hole, and the same steel bar is inserted into the dismantling holes of the steel pipes which are arranged oppositely.

As a preferable technical scheme of the construction method for intercepting and retaining water of the well pit, the dismantling hole is an elliptical hole.

The invention has the beneficial effects that:

according to the well pit water-intercepting and soil-retaining construction method provided by the invention, the structure of the steel pipe and the steel plate is adopted, so that the water and soil loss of the side slope in the construction process can be prevented, and the construction period is saved. Because the construction is carried out by adopting the mode of pressing the steel pipe and the steel plate, the labor of constructors can be reduced, the repeated bottom cleaning work caused by unstable side slope can be avoided, the construction period can be effectively shortened, the construction cost can be saved, and the construction is safer and more reliable.

Drawings

FIG. 1 is a schematic structural view of a steel pipe and a steel plate according to an embodiment of the present invention during operation;

FIG. 2 is a schematic view showing another structure of a steel pipe and a steel plate according to an embodiment of the present invention during operation;

FIG. 3 is a cross-sectional view of FIG. 2;

FIG. 4 is a schematic diagram of construction of a tower crane structure provided by the embodiment of the invention;

FIG. 5 is a schematic structural diagram of the operation of the steel pipe and the steel plate in the tower crane pit according to the embodiment of the present invention.

In the figure:

1. a steel pipe; 11. wedging; 2. a steel plate; 21. hoisting holes; 3. reinforcing steel bars; 4. a water barrier layer; 5. a vacuum dewatering floral tube; 6. a hoisting ring; 7. connecting sheets; 8. a foundation; 9. a tower crane structure.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment provides a well pit water-intercepting and soil-retaining construction method which can reduce labor cost, improve construction efficiency and shorten construction period.

s1, measuring and determining a well pit side line;

the pit is according to different use scenes, and its length and width are all inequality, and its main application crouches the part under elevator shaft, sump pit or tower crane foundation etc. consequently, the measurement is confirmed the pit sideline and then can be made constructor carry out follow-up steel pipe 1 and steel sheet 2's lectotype as required. The length and width of the pit are larger than those of the underground structure to be constructed, for example, when the pit is a foundation pit of the elevator shaft, the distance between the pit and the edge of the elevator shaft is 1.2 m.

S2, determining the lengths of the steel pipe 1 and the steel plate 2 according to the sideline length;

wherein, the steel pipe 1 can be directly obtained by cutting scaffold pipes, the scaffold pipes can be easily obtained and have turnover, the construction cost is saved, and the steel plate 2 needs to be purchased and welded.

S3, pressing and burying the steel pipe 1 and the steel plate 2 at the determined corner of the well pit, wherein the length of the steel plate 2 and the bottom of the steel pipe 1 entering a water-resisting layer is more than or equal to a preset length;

when the basic cushion layer of the well pit is silt, the steel pipe 1 and the steel plate 2 can sink under the action of pressure; when the basic cushion layer of the well pit is made of other soil, the steel pipe 1 and the steel plate 2 can be pressed downwards to achieve the sinking purpose.

S4, excavating earth in the area enclosed by the steel pipe 1 and the steel plate 2;

s5, carrying out underground structure construction;

and S6, removing the steel plate 2 and the steel pipe 1.

The well pit water-intercepting and soil-retaining construction method provided in the embodiment adopts the structure of the steel pipe 1 and the steel plate 2, can prevent water and soil loss of the side slope in the construction process, and saves the construction period. Because the construction is carried out by adopting the mode of pressing the steel pipe 1 and the steel plate 2, the labor of constructors for lowering water and preventing multiple bottom cleaning work caused by unstable side slopes can be reduced, the construction period is effectively shortened, the construction cost is saved, and the construction is safer and more reliable.

As shown in fig. 1-3, before the earth is excavated, vacuum precipitation floral tube 5 is buried in the area surrounded by steel tube 1 and steel plate 2 for precipitation, when the ground layer is silt layer, the excavation ground layer is disturbed, the water and sand gushing easily occur, the operation collapse is easily caused, therefore, vacuum precipitation floral tube 5 is needed to be used for precipitation of the ground layer, especially, the precipitation can be successfully carried out when the underground river is met, and water flow can be intensively discharged, thereby ensuring the construction safety. Meanwhile, the length of the steel plate 2 and the bottom of the steel pipe 1 entering the waterproof layer 4 is larger than 200 mm.

In the embedded steel pipes 1, three steel pipes 1 are provided at the corners of the pit, and the pipe center axes of the three steel pipes 1 form a triangle, so that the steel pipes 1 at the corners can be stabilized, and the collapse probability can be reduced. Of course, two steel pipes 1 may be provided (see fig. 2). Simultaneously,

steel sheet

2 and 1 plug-in connection of steel pipe, the one end that steel sheet 2 stretched into in the steel pipe 1 has still welded connecting plate 7, prevents that steel sheet 2 from deviating from in the steel pipe 1, when the installation, welds connecting plate 7 and steel sheet 2 earlier, then penetrates steel pipe 1 with steel sheet 2 from the bottom of steel pipe 1 or top in, connecting plate 7 can prevent to break away from between steel pipe 1 and the steel sheet 2, guarantees the two firm in connection. The steel pipe 1 is provided with the wedge 11, so that the steel plate 2 can conveniently penetrate into the wedge, the steel plate 2 and the steel pipe 1 can be ensured to move downwards, and collapse caused by one lag of the steel plate 2 and the steel pipe 1 is prevented. Meanwhile, the steel plate 2 is inserted into the wedge opening of the steel pipe 1, so that the overall effect can be improved, the steel plate is more stable, and the soil pressure resistance is stronger. Wherein the thickness of the steel plate 2 in this embodiment is 8mm, the diameter of the steel pipe is 48mm, and the wall thickness is 3.5 mm.

Preferably, two steel pipes 1 are arranged between the adjacent steel plates 2 on the same side, and the two adjacent steel pipes 1 are welded and connected in a full-welded mode. This kind of setting mode can make steel pipe 1 block the pressure of outside soil layer, prevents that the soil layer from collapsing in excavating the in-process, can also do benefit to the stagnant water in addition and prevent the quicksand, and in addition, adjacent steel pipe 1 welded connection also is for increasing steel pipe 1's compressive capacity. Further, when stratum soil is hard, the steel plate 2 and the steel pipe 1 are pressed into the pit to be dug through a hooking machine. Meanwhile, the steel plate 2 and the steel pipe 1 are dismantled through a tower crane or a hook machine.

Preferably, each steel plate 2 is provided with a hanging hole 21 in the present embodiment. The hook machine or the tower crane is directly matched with the lifting hole 21 to pull out the steel plate 2 from the pit, so that the purpose of removing the steel plate 2 is realized. In addition, each steel pipe 1 is provided with a dismantling hole, the same steel bar 3 is inserted into the dismantling holes of the steel pipes 1 which are oppositely arranged, and the diameter of the steel bar 3 is 18 mm. Before dismantling, the steel bars 3 need to be installed in two oppositely arranged dismantling holes, and then the steel pipe 1 is pulled out through a hook machine or a tower crane. Because there is the displacement deviation between the relative steel pipe 1, in order to guarantee that the serious problem of toppling over on one side can not appear in the in-process of demolising, in this embodiment, demolish the hole and be oval-shaped hole, the minor axis in oval-shaped hole is 20 mm. The lengths of the adjacent steel pipes 1 are different, so that the reinforcing steel bars 3 can be easily penetrated and integrally pulled out. When the dismounting hole on one steel pipe 1 is relatively low, the steel bars 3 can be properly adjusted, and all the steel pipes 1 are ensured to be pulled out simultaneously.

Taking a tower crane foundation pit as an example, as shown in fig. 4, a foundation 8 is firstly tamped above the water-resisting layer 4, and then a tower crane structure 9 is built. When steel plate 2 and steel pipe 1 need to be demolishd, as shown in fig. 5, connect through wire rope with rings 6 through colluding the machine, rings set up on reinforcing bar 3, collude the machine and carry and draw reinforcing bar 3, can directly demolish steel pipe 1 from the foundation ditch.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A well pit water interception and soil retaining construction method is characterized by comprising the following steps:

measuring and determining a well pit side line;

determining the lengths of the steel pipe (1) and the steel plate (2) according to the sideline length;

burying the steel pipe (1) and the steel plate (2) at the determined corner of the well pit, wherein the length of the steel plate (2) and the bottom of the steel pipe (1) entering the waterproof layer (4) is more than or equal to a preset length;

excavating earth in an area surrounded by the steel pipe (1) and the steel plate (2);

carrying out underground structure construction;

dismantling the steel plate (2) and the steel pipe (1);

the steel plate (2) and the steel pipe (1) are dismantled through a tower crane or a hook machine;

each steel pipe (1) is provided with a dismantling hole, and the same steel bar (3) is inserted into the dismantling holes of the steel pipes (1) which are arranged oppositely;

a wedge opening (11) is formed in the steel pipe (1), the steel plate (2) can penetrate into the steel pipe (1) through the wedge opening (11), and the steel plate (2) can move downwards together with the steel pipe (1);

the steel plate (2) is connected with the steel pipe (1) in an inserting manner;

two steel pipes (1) are arranged between the adjacent steel plates (2) on the same side, the adjacent steel pipes (1) are connected in a welding mode, and the lengths of the adjacent steel pipes (1) are different.

2. A well pit water-intercepting soil-retaining construction method according to claim 1, wherein when the ground is a silt layer, the vacuum water-lowering perforated pipe (5) is buried in an area surrounded by the steel pipe (1) and the steel plate (2) for lowering water before the earth is excavated.

3. A pit water-intercepting soil-retaining construction method according to claim 1, wherein three steel pipes (1) are provided at the corners of the pit.

4. The well pit water interception and soil retention construction method according to claim 1, wherein the steel plate (2) and the steel pipe (1) are pressed into the well pit to be excavated by a hook machine.

5. A pit water-intercepting soil-retaining construction method according to claim 1, wherein each of the steel plates (2) is provided with a hanging hole (21).

6. A pit water-intercepting soil-retaining construction method according to claim 1, wherein the demolition hole is an elliptical hole.