CN111778964B - Foundation pit hollow support pile, construction method thereof and foundation pit support structure - Google Patents

Abstract

The invention provides a foundation pit hollow support pile, a construction method thereof, and a foundation pit support structure. The foundation pit hollow support pile comprises: a prefabricated pile body, the prefabricated pile body has an inner cavity that penetrates up and down; , centrally installed in the inner cavity; and the fixing material filled between the inclinometer tube and the inner cavity, including alternately arranged sand layers and mortar layers, the thickness of the sand layer is greater than that of the mortar The thickness of the layer, the mortar layer is consolidated to form a force transmission plate connecting the inclinometer pipe and the prefabricated pile body. The invention solves the problems of complicated and high cost in site construction of traditional cast-in-place pile supporting piles and inner supports in the form of foundation pit supporting.

Description

Foundation pit hollow supporting pile and its construction method and foundation pit supporting structure

technical field

The invention relates to the technical field of building construction, in particular to a foundation pit hollow supporting pile, a construction method thereof, and a foundation pit supporting structure.

Background technique

With the continuous development of urban construction, the scale of large-scale infrastructure construction is getting bigger and bigger, the foundation design depth is getting deeper and deeper, and the foundation pit support situation is more complicated. Generally, the support of deep foundation pit is mostly the support form of grading + cast-in-place pile + internal support combined structure. The on-site construction of cast-in-place piles and inner supports in the form of traditional foundation pit support is laborious and costly.

SUMMARY OF THE INVENTION

In order to overcome the defects existing in the prior art, a foundation pit hollow supporting pile and its construction method and a foundation pit supporting structure are now provided, so as to solve the problems of the traditional foundation pit supporting form of the cast-in-place pile supporting pile and the inner support. On-site construction is troublesome and costly.

In order to achieve the above purpose, a foundation pit hollow support pile is provided, including:

a prefabricated pile body, the prefabricated pile body has an inner cavity that penetrates up and down;

an inclinometer tube centrally mounted in the lumen; and

The fixing material filled between the inclinometer tube and the inner cavity includes alternately arranged sand layers and mortar layers, the thickness of the sand layers is greater than the thickness of the mortar layers, and the mortar layers are consolidated to form a connection The inclinometer tube and the force transmission plate of the prefabricated pile body.

Further, the thickness of the sand layer is 3 to 5 times the thickness of the mortar layer.

Further, the thickness of the mortar layer is 0.3m.

Further, the bottom layer of the fixing material is the sand layer.

Further, the prefabricated pile body is a rectangular hollow pile.

The invention provides a construction method of a foundation pit hollow support pile, comprising the following steps:

Buried prefabricated piles;

Centrally install the inclinometer tube in the inner cavity of the prefabricated pile body;

Between the inclinometer tube and the inner cavity of the prefabricated pile body, the sand layer and the mortar layer of the fixing material are alternately filled, so that the mortar layer is consolidated to form a transmission connecting the inclinometer tube and the prefabricated pile body. force board.

The invention provides a foundation pit support structure, which is composed of a foundation pit hollow support pile, a solid cast-in-place support pile and a jetted anchor cable. The foundation pit hollow support pile and the solid cast-in-place support pile are alternately arranged in Around the foundation pit, each of the foundation pit hollow support piles and the solid cast-in-place support piles are respectively connected with the jetting anchor cable, and the jetting anchor cable is embedded in the foundation of the foundation pit.

The beneficial effect of the invention is that the foundation pit hollow support pile of the invention adopts the prefabricated pile body instead of the cast-in-place support pile, which can save on-site construction time and reduce the construction cost, and the inclination pipe is fixed by the mortar layer and the sand layer of the fixing material It is installed in the inner cavity of the prefabricated pile body. The main body of the fixing material is filled with sand to avoid increasing the strength and lateral stiffness of the prefabricated pile body, so as to accurately monitor the soil deformation at the upper part of the foundation pit through the inclinometer tube to ensure the inclination measurement. The monitoring is accurate and effective.

Description of drawings

FIG. 1 is a schematic structural diagram of a foundation pit hollow support pile according to an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a prefabricated pile body according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of the state of the inclinometer tube installed in the inner cavity according to the embodiment of the present invention.

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

Fig. 1 is a schematic structural diagram of a foundation pit hollow support pile according to an embodiment of the present invention; Fig. 2 is a structural schematic diagram of a prefabricated pile body according to an embodiment of the present invention; Status diagram.

Referring to FIGS. 1 to 3 , the present invention provides a foundation pit hollow support pile, comprising: a prefabricated pile body 1 , an inclinometer tube 2 and a fixing material 3 .

Wherein, the prefabricated pile body 1 has an inner cavity 10 that penetrates vertically. The inclinometer tube 2 is centrally installed in the inner cavity 10. The fixing material 3 is filled between the inclinometer tube 2 and the inner cavity 10 of the prefabricated pile body.

Specifically, the fixing material 3 includes a sand layer 31 and a mortar layer 32 . The sand layers 31 and the mortar layers 32 are filled in layers between the inclinometer tube 2 and the inner cavity 10 of the prefabricated pile body, and the sand layers 31 and the mortar layers 32 are alternately arranged.

The thickness of the sand layer 31 is greater than the thickness of the mortar layer 32 . The mortar layer 32 forms a solid force transmission plate connected between the inclinometer pipe 2 and the prefabricated pile body 1 after consolidation.

The foundation pit hollow supporting pile of the present invention adopts the prefabricated pile body instead of the cast-in-place supporting pile, which can save construction time and reduce the construction cost. In the cavity, the main body of the fixing material is filled with sand layer to avoid increasing the strength and lateral stiffness of the prefabricated pile body, so as to accurately monitor the soil deformation in the upper part of the foundation pit through the inclinometer pipe, and ensure the accurate and effective inclinometer monitoring.

As a preferred embodiment, the thickness of the sand layer 31 is 3 to 5 times the thickness of the mortar layer 32 .

Specifically, in this embodiment, the thickness of the mortar layer 32 is 0.3 m. The thickness of the sand layer is 1m to 1.5m. The sand layer is the river sand layer formed by pouring river sand into the prefabricated pile body.

The sand layer and the mortar layer, starting from the bottom end of the prefabricated pile body, are alternately filled between the inner cavity of the prefabricated pile body and the inclinometer pipe and to the cavity opening at the top of the prefabricated pile body, and the filling is dense.

In this embodiment, the bottom layer of the fixing material 3 is a sand layer 31 . Through the method of filling sand and cement mortar alternately between the inclinometer tube and the inner cavity of the prefabricated pile body, without increasing the stiffness and strength of the hollow prefabricated pile body, the inclinometer tube and the hollow prefabricated pile body can be effectively connected. Connect, measure the inclination deformation of the prefabricated pile body accurately to the greatest extent, so as to accurately grasp the deformation of the upper soil body of the foundation pit.

In this embodiment, the prefabricated pile body 1 is a rectangular hollow pile. The cross section of the prefabricated pile body is rectangular.

The invention provides a construction method of a foundation pit hollow support pile, comprising the following steps:

S1: The prefabricated pile body 1 is embedded.

S2: Centeringly install the inclinometer tube 2 in the inner cavity 10 in the prefabricated pile body 1 .

S3: Fill the sand layer 31 and the mortar layer 32 of the fixing material 3 alternately between the inclinometer tube 2 and the inner cavity 10 of the prefabricated pile body 1, so that the mortar layer 32 is consolidated to form a connection between the inclinometer tube 2 and the prefabricated pile body 1. Power transmission board.

The invention provides a foundation pit supporting structure. The foundation pit supporting structure is composed of a foundation pit hollow supporting pile, a solid cast-in-place supporting pile and a jetting anchor cable. Among them, foundation pit hollow support piles and solid cast-in-place support piles are alternately arranged around the edge of the foundation pit. Each foundation pit hollow supporting pile and each solid cast-in-place supporting pile are respectively connected with jetting anchor cables. The jetted anchor cable is buried in the foundation of the foundation pit.

The invention provides a foundation pit supporting structure which adopts the combination form of prefabricated foundation pit hollow supporting piles, solid cast-in-place supporting piles and rotary jetting anchor cables, avoids the use of internal supports, saves construction time and construction cost on the project site, and at the same time , using the foundation pit hollow support pile to effectively install the inclinometer tube to accurately and accurately measure the inclination deformation of the prefabricated pile body of the foundation pit hollow support pile, so as to accurately grasp the deformation of the upper soil body of the foundation pit.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not intended to limit the present invention. The limited conditions that can be implemented have no technical significance, and any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the present invention without affecting the effect and the purpose that can be achieved. It is within the scope that the technical content disclosed in the present invention can cover. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and clarity, and are not used to limit this specification. The implementable scope of the invention, and the change or adjustment of the relative relationship thereof, shall also be regarded as the implementable scope of the present invention without substantially changing the technical content.

The present invention has been described in detail above with reference to the embodiments of the accompanying drawings, and those skilled in the art can make various modifications to the present invention according to the above description. Therefore, some details in the embodiments should not be construed to limit the present invention, and the present invention will be protected by the scope defined by the appended claims.

Claims (4)

1. The utility model provides a hollow fender pile of foundation ditch which characterized in that includes:

the prefabricated pile body is provided with an inner cavity which is communicated up and down;

the inclinometer tube is arranged in the inner cavity in a centering way; and

the fixing material filled between the inclinometer pipe and the inner cavity comprises a sand layer and a mortar layer which are alternately arranged, the thickness of the sand layer is greater than that of the mortar layer, and the mortar layer is solidified to form a force transmission plate for connecting the inclinometer pipe and the precast pile body;

the thickness of the sand layer is 3-5 times of that of the mortar layer;

the thickness of the mortar layer is 0.3 m;

the bottom layer of the fixing material is the sand layer.

2. The foundation pit hollow support pile according to claim 1, wherein the precast pile body is a rectangular hollow pile.

3. A construction method of a hollow foundation pit supporting pile according to any one of claims 1-2, characterized by comprising the following steps:

embedding a prefabricated pile body;

an inclinometer pipe is arranged in the inner cavity of the precast pile body in a centering way;

and alternately filling a sand layer and a mortar layer of a fixing material between the inclinometer pipe and the inner cavity of the precast pile body, so that the mortar layer is solidified to form a force transmission plate for connecting the inclinometer pipe and the precast pile body.

4. A foundation pit supporting structure, characterized by comprising the hollow foundation pit supporting piles, the solid cast-in-place supporting piles and the jet grouting anchor cables according to any one of claims 1 to 2, wherein the hollow foundation pit supporting piles and the solid cast-in-place supporting piles are alternately arranged around a foundation pit, each of the hollow foundation pit supporting piles and the solid cast-in-place supporting piles is respectively connected with the jet grouting anchor cables, and the jet grouting anchor cables are buried in the foundation of the foundation pit.

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