Soil mixing wall (SMW) construction method pile foundation pit supporting structure

Abstract

An SMW construction method pile foundation pit supporting structure comprises a vertically-arranged fender post, the fender post comprises a plurality of cement mixing piles and a plurality of H-shaped steel, the cement mixing piles are fixedly installed along the side wall of a foundation pit at equal intervals, the H-shaped steel is arranged in the cement mixing piles, and first pulling assisting structures are fixedly connected to the upper ends of the sides, close to the foundation pit, of the H-shaped steel in a bolted mode; the upper ends of the sides, away from the foundation pit, of the multiple pieces of H-shaped steel are fixedly provided with second pulling assisting structures in a bolted mode, the tops of the multiple first pulling assisting structures are provided with first fixing parts, the tops of the multiple second pulling assisting structures are provided with second fixing parts, and the shapes of the first pulling assisting structures and the shapes of the second pulling assisting structures are attached to the surfaces of the H-shaped steel. By means of the pulling assisting structure, the contact area of the H-shaped steel and the cement mixing pile can be smaller, the situation that the H-shaped steel inclines or cannot be pulled out is avoided during pulling out, the consumed time is shorter, and the cost is lower.

Description

TECHNICAL FIELD

[0001] The utility model relates to construction technical field, especially a kind of SMW method pile foundation pit supporting structure. BACKGROUND

[0002] SMW method pile, also known as steel cement mixing pile wall, that is, using triaxial mixing pile drill to cut soil in original stratum, while low-pressure injection of cement slurry is carried out in front end of drill, and cut soil is fully mixed to form high water-resisting cement soil column type retaining wall, before cement slurry hardens, a kind of underground engineering construction technology of inserting H-shaped steel, SMW method pile has very broad application prospect, and has been affirmed by Shanghai civil engineering circle.

[0003] And after underground main structure is completed to reach design strength and backfill, H-shaped steel needs to be pulled out and recycled, special fixture and jack are used to pull out, and beam is used as counter beam, H-shaped steel is repeatedly jacked up to recycle, H-shaped steel is always lifted by crane during pulling-out process, after jack is jacked up to certain height, 25 tons crane is used to lift H-shaped steel and stack in specified site, and H-shaped steel is batched and concentrated to transport out site.In this process, H-shaped steel may be inclined or unable to be pulled out due to various problems, even if it can be pulled out normally by jack, it is slow and low in efficiency. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of SMW method pile foundation pit supporting structure to solve the problems existing in the prior art.

[0005] The above technical purpose of the utility model is realized by the following technical scheme:

[0006] A kind of SMW method pile foundation pit supporting structure, including the fender pile of vertical setting, the fender pile includes multiple cement mixing piles and multiple H-shaped steels, the multiple cement mixing piles are fixedly installed along the side wall of foundation pit at equal intervals, and H-shaped steel is arranged in the multiple cement mixing piles;

[0007] The top of the wider side of the multiple H-shaped steels is provided with a first threaded hole, a second threaded hole is arranged below the first threaded hole at intervals, a first pull-out assisting structure is fixedly bolted to the upper end of one side of the multiple H-shaped steels close to foundation pit, a second pull-out assisting structure is fixedly bolted to the upper end of one side of the multiple H-shaped steels away from foundation pit, the top of multiple first pull-out assisting structures is provided with a first fixed part, the top of multiple second pull-out assisting structures is provided with a second fixed part, and the shape of the first pull-out assisting structure and the second pull-out assisting structure is matched with the surface of H-shaped steel.

[0008] By adopting the technical scheme, in addition to setting the H-shaped steel in each cement mixing pile, according to different geographical environments of the construction site, the H-shaped steel can be set by inserting one every other one or by inserting one every two, one feature of the H-shaped steel is that it can be reused, which is one of the reasons why the SWM pile engineering cost is low, and after the H-shaped steel is inserted, it is necessary to ensure that the H-shaped steel can be pulled out from the cement mixing pile after the cement mixing pile is formed, therefore, the tensile strength of the H-shaped steel is calculated before construction, and a drag reduction agent is applied to the surface of the H-shaped steel, and by adding an additional pulling structure to the upper end of the H-shaped steel, more than half of the H-shaped steel is not in direct contact with the cement mixing pile, but is in contact with the pulling structure which is smoother, smoother and has relatively low resistance, the shape of the pulling structure is almost the same as that of the H-shaped steel, the first pulling structure is the left half of the H plus the front half of the middle horizontal bar, and the second pulling structure is the right half of the H plus the rear structure of the middle horizontal bar, before the H-shaped steel is inserted, the pulling structure and the H-shaped steel are bolted through a plurality of threaded holes, the connection between the two is located at the top end of the H-shaped steel, and the pulling structure does not completely cover the H-shaped steel, but only covers half or two-thirds of it, after complete insertion, the connection position is still exposed, when the cement mixing pile is formed and the H-shaped steel needs to be pulled out, the tool ends the bolted connection between the pulling structure and the H-shaped steel, and the H-shaped steel is quickly pulled out from the pulling structure, at this time, the friction between the H-shaped steel and the cement mixing pile is only half or one-third of the original, the force consumed during the pulling process is significantly reduced, and the pulling speed is faster, which can more quickly complete the pulling task of the multiple H-shaped steels in the enclosure pile, greatly reducing the pulling time and effectively improving the work efficiency, and the pulling structure obtains additional space after the H-shaped steel is pulled out, that is, the position originally occupied by the H-shaped steel, and the side of the pulling structure in contact with the cement mixing pile is also coated with a drag reduction agent, therefore, it is much more convenient to pull out the pulling structure than to directly pull out the H-shaped steel, and the pulling structure can be reused subsequently, and the cost is also controllable.

[0009] In further embodiments, the bottom of the plurality of H-shaped steels is provided with an obtuse inverted acute structure, one side of the plurality of H-shaped steels is provided with a plurality of inclination sensors from top to bottom at intervals, the other side of the plurality of H-shaped steels is provided with a plurality of displacement sensors from top to bottom at intervals, the first pulling structure and the second pulling structure are both provided with accommodating grooves for accommodating the sensors on the H-shaped steels.

[0010] By adopting the technical scheme, if the sensor is arranged inside the H-shaped steel, the structural strength and tensile strength of the H-shaped steel can be affected, and if the sensor is arranged at a place directly rubbing against the cement mixing pile, the sensor can be damaged, therefore, after cooperating with the pulling assisting structure, the sensor is arranged on the surface of the H-shaped steel and is protected by the accommodating groove on the pulling assisting structure, and does not directly collide with or rub against the pulling assisting structure or the cement mixing pile, and once the H-shaped steel is tilted or displaced due to improper mud liquid proportioning or uneven stirring, the displacement sensor and the inclination sensor on the H-shaped steel can timely output error information to the receiving end through the wireless output module, so that the H-shaped steel and the cement mixing pile with problems can be adjusted in time, the safety and implementability of the whole project are evaluated, and since the H-shaped steel and the pulling assisting structure are repeatedly used, the cost of the added sensor can be effectively reduced.

[0011] In a further embodiment, the first pulling assisting structure and the second pulling assisting structure are provided with a drag reduction agent on the side in contact with the H-shaped steel.

[0012] By adopting the technical scheme, the drag reduction agent can further reduce the friction between the pulling assisting structure and the H-shaped steel, so that the H-shaped steel is pulled out more easily and quickly, and the requirement for the tensile strength of the H-shaped steel is further reduced.

[0013] In a further embodiment, the bottom of the first pulling assisting structure and the bottom of the second pulling assisting structure are provided with an acute angle blunt structure.

[0014] By adopting the technical scheme, the acute angle blunt structure is mainly arranged on one side of the H-shaped steel, which can help the pulling assisting structure to better penetrate into the concrete mixing pile, and since the upper end is bolted and fixed to the H-shaped steel, a certain adhesion is maintained, and too much concrete cannot penetrate into the gap, and a small part of the penetrated concrete can be dispersed due to the lifting of the hydraulic jack, and since the drag reduction agent is applied to the layer opposite to the pulling assisting structure and the H-shaped steel, even if a part of the concrete is stirred between the two, the friction will not be significantly increased.

[0015] In a further embodiment, a lifting ring is welded at the middle position of the top of the first fixing part and the second fixing part.

[0016] By adopting the technical scheme, the lifting ring can facilitate the removal of the pulling assisting structure after the H-shaped steel is pulled out, and can also cooperate with the limiting device to ensure the positions of each other.

[0017] In further embodiments, one end of the limiting device is clamped on the lifting ring of the first fixed part, and the other end of the limiting device is clamped on the lifting ring of the second fixed part.

[0018] By adopting the technical scheme, the limiting device can fix the first and second pulling assisting structures, so that the two pulling assisting structures can be directly lifted by a lifting machine or other tools.

[0019] In summary, the utility model has the following beneficial effects:

[0020] 1. By the setting of the pulling assisting structure, the pulling assisting structure and the H-shaped steel can be bolted through the plurality of threaded holes before being inserted into the H-shaped steel, the connection position of the two is located at the top end of the H-shaped steel, and the pulling assisting structure does not completely cover the H-shaped steel, but only covers half or two-thirds of the H-shaped steel, after complete insertion, the connection position is still exposed, when the cement mixing pile is formed, the bolted connection of the pulling assisting structure and the H-shaped steel is disconnected by a tool, and the H-shaped steel is quickly pulled out of the pulling assisting structure, at this time, the friction between the H-shaped steel and the cement mixing pile is only half or one-third of the original, the force consumed in the pulling-out process is significantly reduced, and the pulling-out speed is faster, the pulling-out task of the plurality of H-shaped steels in the enclosure pile can be completed more quickly, the pulling-out time is greatly reduced, and the working efficiency is improved.

[0021] 2. By the setting of the inclination sensor and the displacement sensor, once the H-shaped steel is inclined or displaced due to improper mud liquid ratio or uneven stirring, the displacement sensor and the inclination sensor on the H-shaped steel can timely output the error information to the receiving end through the wireless output module, so that the H-shaped steel and the cement mixing pile with problems can be adjusted in time, the safety and implementability of the whole project are evaluated, and the engineering quality is effectively improved.

[0022] 3. By the setting of the lifting ring and the limiting device, the lifting ring can conveniently remove the pulling assisting structure after the H-shaped steel is pulled out, and the position of the lifting ring and the limiting device can be ensured by cooperation, the limiting device can fix the first and second pulling assisting structures, so that the two pulling assisting structures can be directly lifted by a lifting machine or other tools. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a whole schematic view of the SMW method pile foundation pit supporting structure of the utility model;

[0024] Figure 2 is a schematic view of the SMW method pile foundation pit supporting structure of the utility model, which is used for reflecting the connection relationship between the H-shaped steel and the pulling assisting structure;

[0025] Figure 3 is a structure diagram for embodying the assisting structure in the SMW method pile foundation pit supporting structure.

[0026] In the figure, 1, the enclosure pile; 11, cement mixing pile; 12, H-shaped steel; 2, the first assisting structure; 3, the second assisting structure; 4, the lifting ring; 5, the limiting device. DETAILED DESCRIPTION

[0027] The utility model will be further described in detail below in combination with the drawings.

[0028] Wherein, same parts are indicated by same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom surface" and "top surface", "inner" and "outer" refer to the direction towards or away from the specific part geometry. In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited. Figure 1

[0029] Example 1:

[0030] As Figures 1-3 ​As shown, a SMW method pile foundation pit supporting structure, including a vertical setting of the enclosure pile 1, enclosure pile 1 including a plurality of cement mixing pile 11 and a plurality of H-shaped steel 12, a plurality of cement mixing pile 11 along the side wall of the foundation pit fixed installation, a plurality of cement mixing pile 11 all are provided with H-shaped steel 12, a plurality of H-shaped steel 12 close to the upper end of the side of the foundation pit all are bolted and fixed with the first pull assist structure 2, a plurality of H-shaped steel 12 away from the upper end of the side of the foundation pit all are bolted and fixed with the second pull assist structure 3, the top of a plurality of first pull assist structure 2 all are provided with first fixed part, the top of a plurality of second pull assist structure 3 all are provided with second fixed part, the shape of first pull assist structure 2 and second pull assist structure 3 all are consistent with the surface of H-shaped steel 12, the top of first fixed part and second fixed part all are welded with lifting ring 4, one end of the lifting ring 4 of first fixed part is connected with the one end of limiting device 5, the limiting device 5 can be composed of two rods, the two rods are connected by thread, and the other end away from the connecting end is provided with a limiting part, which is used to avoid the left and right sliding of limiting device 5 on the lifting ring 4, the other end of the lifting ring 4 of second fixed part is connected with the other end of limiting device 5, the shape of first pull assist structure 2 is consistent with the surface of H-shaped steel 12, the side of first pull assist structure 2 and second pull assist structure 3 in contact with H-shaped steel 12 all are provided with drag reduction agent, the side of H-shaped steel 12 in contact with first pull assist structure 2 and the side of H-shaped steel 12 in contact with second pull assist structure 3 all are provided with drag reduction agent, the bottom of first pull assist structure 2 and the bottom of second pull assist structure 3 all are provided with acute angle blunt structure, by setting first pull assist structure 2 and second pull assist structure 3 on the outside of H-shaped steel 12, and coating drag reduction agent on the surface between first pull assist structure 2 and second pull assist structure 3 and H-shaped steel 12, H-shaped steel 12 can be quickly pulled out of cement mixing pile 11, when installing, the top of pull assist structure and H-shaped steel 12 is connected by bolt, the bottom of pull assist structure is also provided with acute angle blunt structure, which can reduce resistance, in addition to the bolt connection of the top and the quality of the pull assist structure itself, it can enter cement mixing pile 11 in the case of close to H-shaped steel 12, and when pulling out, most of H-shaped steel 12 is in contact with the more smooth pull assist structure coated with drag reduction agent, only the weight of H-shaped steel 12 needs to be considered when pulling up, without consuming extra force due to the roughness of cement mixing pile 11 itself, so that the hydraulic jack can be more labor-saving, the requirement for the tensile strength of H-shaped steel 12 is lower, the pulling out of H-shaped steel 12 can be accelerated, the time and labor cost of engineering consumption is reduced, and the construction efficiency is effectively improved.

[0031] As Figures 1-3As shown, the bottom of the plurality of H-shaped steels 12 is provided with an obtuse inverted acute structure, one side of the plurality of H-shaped steels 12 is provided with a plurality of inclination sensors from top to bottom at intervals, the other side of the plurality of H-shaped steels 12 is provided with a plurality of displacement sensors from top to bottom at intervals, the first and second pulling assisting structures 2 and 3 are both provided with accommodating grooves for accommodating the sensors on the H-shaped steel 12, through the arrangement of the inclination sensors and the displacement sensors, the sensors can be protected through the accommodating grooves on the pulling assisting structures, so as not to affect the service life of the sensors during the pulling process of the H-shaped steel 12, and after the arrangement of the sensors, the state of the H-shaped steel 12 can be sensed, whether the inclination or the position offset is generated, if the inclination or the position offset is generated, the sensor can inform the construction party through the remote communication module, so that the construction party can timely adjust, so as to avoid more serious losses in the future.

[0032] In the embodiments disclosed in the present application, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense. For example, "connecting" can be fixedly connected, or detachably connected, or integrally connected. "Connecting" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the embodiments disclosed in the present application can be understood according to the specific circumstances.

[0033] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, as long as the modifications are within the scope of the claims of the present application.

Claims

1. A SMW method pile foundation pit support structure comprising a vertically arranged retaining pile (1), characterized in that: The enclosure pile (1) comprises a plurality of cement mixing piles (11) and a plurality of H-shaped steels (12), the plurality of cement mixing piles (11) are fixedly installed along the sidewall of the foundation pit at equal intervals, and the plurality of H-shaped steels (12) are arranged in the plurality of cement mixing piles (11); The upper end of the plurality of H-shaped steels (12) close to one side of the foundation pit is bolted and fixed with a first pulling assisting structure (2), the upper end of the plurality of H-shaped steels (12) away from one side of the foundation pit is bolted and fixed with a second pulling assisting structure (3), the top of the plurality of first pulling assisting structures (2) is provided with a first fixing part, the top of the plurality of second pulling assisting structures (3) is provided with a second fixing part, and the shapes of the first pulling assisting structure (2) and the second pulling assisting structure (3) are matched with the surface of the H-shaped steel (12).

2. A SMW construction pile foundation pit supporting structure according to claim 1, characterized in that: The bottom of the plurality of H-shaped steels (12) is provided with an obtuse inverted acute structure, one side of the plurality of H-shaped steels (12) is provided with a plurality of inclination sensors at intervals from top to bottom, the other side of the plurality of H-shaped steels (12) is provided with a plurality of displacement sensors at intervals from top to bottom, and the first pulling assisting structure (2) and the second pulling assisting structure (3) are provided with accommodating grooves, which are used for accommodating the sensors on the H-shaped steel (12).

3. The SMW construction pile foundation pit support structure according to claim 1, characterized in that: The side of the first pulling assisting structure (2) and the second pulling assisting structure (3) in contact with the H-shaped steel (12) is provided with a drag-reducing agent, and the side of the H-shaped steel (12) in contact with the first pulling assisting structure (2) and the side of the H-shaped steel (12) in contact with the second pulling assisting structure (3) are provided with a drag-reducing agent.

4. A SMW construction pile foundation pit supporting structure according to claim 3, characterized in that: The bottom of the first pulling assisting structure (2) and the bottom of the second pulling assisting structure (3) are provided with an acute inverted obtuse structure.

5. The SMW construction pile foundation pit support structure according to claim 1, characterized in that: The top of the first fixing part and the top of the second fixing part are welded with a lifting ring (4) at the middle position.

6. A SMW construction pile foundation pit support structure according to claim 5, characterized in that: One end of the limiting device (5) is clamped on the lifting ring (4) of the first fixing part, and the other end of the limiting device (5) is clamped on the lifting ring (4) of the second fixing part.

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