CN113529812B - Construction method for hoisting and positioning sound measurement pipe of foundation pit reverse construction method cast-in-place pile - Google Patents

Abstract

The invention relates to the technical field of foundation pit cast-in-place piles, and discloses a construction method for hoisting and positioning a sounding pipe of a cast-in-place pile of a foundation pit reverse construction method, which comprises the following construction steps: 1) Digging a pile hole in a rotary mode; 2) The main reinforcement of the reinforcement cage is fixed with a bottom sounding pipe, and the reinforcement cage is suspended and is put into the pile hole; 3) The extension steel bar is connected with an extension sound measuring tube, the extension steel bar is fixedly connected with the main bar, and the extension sound measuring tube is fixedly connected and communicated with the bottom sound measuring tube; 4) Lowering the reinforcement cage to the bottom of the pile hole, and exposing the top of the elongated sounding pipe above the pile hole; 5) Pouring concrete into the pile hole to form a poured pile section at the lower part of the pile hole; through linking together with the steel reinforcement cage, go into bottom sounding pipe earlier, recycle extension reinforcing bar and main muscle be connected, connect extension sounding pipe on bottom sounding pipe, realize fast that sounding pipe leads to the length to arrange to bury underground, reduce the reinforcing bar use amount, reduce construction cost, improve sounding pipe extension installation effectiveness, practice thrift the cost.

Description

Construction method for hoisting and positioning sound measurement pipe of foundation pit reverse construction method cast-in-place pile

Technical Field

The invention relates to the technical field of cast-in-place piles, in particular to a construction method for hoisting and positioning an acoustic pipe of a cast-in-place pile in a foundation pit reverse construction method.

Background

Major diameter bored concrete pile adopts the ultrasonic wave method to detect pile shaft integrality usually, and when the bored concrete pile carried out ultrasonic testing, the sounding pipe was that ultrasonic probe got into the inside passageway of pile shaft, through being connected the ligature of sounding pipe and steel reinforcement cage, with the sounding pipe pre-buried in the concrete of pile shaft, during the construction, must the quality of strict control buried the sounding pipe underground to ensure that follow-up bored concrete pile shaft quality testing goes on smoothly.

With the rapid development of urban construction, the scale of foundation pit engineering is developed towards large area and large depth, the requirements of construction period progress, resource saving and the like are increasingly strict, and deep and large foundation pits are often constructed by a reverse construction method to accelerate the engineering progress. The reverse construction method requires that before excavation of a foundation pit, a foundation pit supporting structure is firstly constructed on the ground, cast-in-place pile construction is carried out, a steel structure column in butt joint with the cast-in-place pile is installed, then a first floor is constructed, and a support, the cast-in-place pile and the steel structure column are connected into a whole through the first floor and serve as a supporting structure for bearing the self weight and construction load of an upper structure during construction. In the reverse construction method, the cast-in-place pile is detected on the ground before the floor slab is excavated.

The Shenzhen urban rail transit No. 13 line 13101-1 standard Shenzhen gulf-mouth shore station main body building envelope engineering, the excavation depth of the foundation pit is 21m, the project design adopts reverse construction method construction, the pile foundation is in the form of a cast-in-place pile below the bottom of the foundation pit, and the excavation range of the basement of the foundation pit is a steel pipe structural column; according to design requirements, after pile foundation construction is completed, detection is needed, and after the detection is qualified, a foundation pit can be excavated.

Therefore, ultrasonic testing needs to be carried out on the pile foundation on the ground, and as the length of the pile hollow hole section is about 21m, namely, the sounding pipe is installed to the ground by lengthening from the cage bottom of the cast-in-place pile reinforcement cage, higher technical requirements are put forward on installation and positioning of the lengthened sounding pipe of the hollow pile section.

Among the prior art, to the sounding pipe installation of deep hole section, steel reinforcement cage owner muscle quantity often through reducing the bored concrete pile, carry out the empty stake section of steel reinforcement cage and lengthen with the mode of simple and easy pair of cage, will lengthen sounding pipe ligature on the vice main muscle of vice steel reinforcement cage, hang and put vice steel reinforcement cage to butt joint position and accomplish and lengthen sounding pipe location to appointed elevation position department, however, in actual construction application, need consume more reinforcing bar, the preparation of vice steel reinforcement cage also needs extra more manual work of cost and time, it is extravagant great.

Disclosure of Invention

The invention aims to provide a hoisting and positioning construction method for a sound measuring pipe of a foundation pit reverse construction method cast-in-place pile, and aims to solve the problems of high cost and low efficiency in sound measuring pipe lengthening construction in the prior art.

The invention discloses a construction method for hoisting and positioning a sound measurement pipe of a foundation pit reverse cast-in-place pile, which comprises the following construction steps:

1) Digging a pile hole to a set elevation by the ground in a rotary mode, wherein a pile casing is arranged in the pile hole in a descending mode, and the top of the pile casing extends to the ground;

2) Manufacturing a reinforcement cage, wherein a bottom sounding pipe is fixed on the inner side of a main reinforcement of the reinforcement cage, and the bottom sounding pipe extends along the axial direction of the main reinforcement; the steel reinforcement cage is suspended and is put into the pile hole, and the top of the bottom sounding pipe is exposed on the ground;

3) Hoisting the extension steel bar to the position above the steel bar cage, wherein the extension steel bar is connected with an extension sounding pipe which extends along the axial direction of the extension steel bar; fixedly connecting the extension steel bars with the main bars, fixedly connecting and communicating the extension sounding pipes with the bottom sounding pipe, wherein the length of the connected bottom sounding pipe is greater than the depth of the pile hole;

4) The reinforcement cage is placed to the bottom of the pile hole, the top of the elongated sounding pipe is exposed above the pile hole, and the elongated reinforcement and the pile casing are kept relatively fixed;

5) And pouring concrete into the pile hole to form a poured pile section at the lower part of the pile hole.

Further, in the construction step 2), the bottom and the top of the bottom sounding pipe are closed.

Furthermore, the bottom of the bottom sounding pipe is located above the bottom of the main rib, and the top of the bottom sounding pipe is located below the top of the main rib.

Further, in the construction step 2), in the process of putting the reinforcement cage into the pile hole, a transverse rod penetrates through the upper part of the reinforcement cage, the transverse rod penetrates through the stirrups of the reinforcement cage, the transverse rod stretches across the top of the pile casing, and the reinforcement cage is hung in the pile hole.

Further, in the construction step 3), a temporary hook is arranged at the lower part of the elongated steel bar, the temporary hook extends upwards and is inserted into the bottom of the elongated sounding pipe to temporarily fix the elongated sounding pipe, a plurality of iron wire rings are hooped between the elongated sounding pipe and the elongated steel bar and are arranged at intervals along the axial direction of the elongated steel bar;

and after the extension steel bars and the main bars are fixed, the extension sounding pipe is moved upwards to disconnect the bottom of the extension sounding pipe from the temporary hook, and the bottom of the extension sounding pipe is fixedly butted and communicated with the top of the bottom sounding pipe.

Further, a conversion hook is welded on the lengthened steel bar, the conversion hook extends upwards and is positioned above the temporary hook; the stretching device is characterized in that a stretching rope striding over the conversion hook is arranged, the lengthening sounding pipe is provided with a lifting position, the lifting position is located below the conversion hook, one end of the stretching rope is connected with the lifting position of the lengthening sounding pipe, the other end of the stretching rope is pulled downwards, the lengthening sounding pipe moves upwards relative to the lengthening reinforcing steel bar, and the bottom of the lengthening sounding pipe is separated from the temporary hook.

Furthermore, a lifting hook is arranged at the lifting position of the elongated sounding pipe, the lifting hook extends downwards, and one end of the pull rope spans the conversion hook and is connected to the lifting hook.

Furthermore, a lifting lug is arranged at the upper part of the lengthened steel bar, and in the construction step 3), the lengthened steel bar is lifted above the steel bar cage by using a crane to be connected with the lifting lug of the lengthened steel bar.

Furthermore, the upper part of the lengthened steel bar is connected with a hanging joint, the hanging joint and the lifting lug are arranged at the same height, and the hanging joint and the lifting lug are oppositely arranged by taking the lengthened steel bar as a symmetrical shaft; in the step 4), after the reinforcement cage is placed to the bottom of the pile hole, the hanging joint is hung at the top of the pile casing, the top of the lengthened reinforcement is temporarily fixed, and a gap is reserved between the lengthened sounding pipe and the pile casing.

Furthermore, the reinforcement cage is provided with a plurality of main ribs, and the plurality of main ribs are correspondingly connected with the plurality of bottom sounding pipes; in the construction step 3), a plurality of elongated steel bars and a steel cage are arranged, each elongated steel bar is connected with the elongated sounding pipe, the steel cage is horizontally arranged and connected with a crane, the plurality of elongated steel bars are connected with the steel cage through lower steel wires, and the plurality of elongated steel bars are arranged in a surrounding manner;

the crane lifts a plurality of the extension reinforcing steel bars to the upper part of the reinforcing cage through lifting the steel cage frame, the extension reinforcing steel bars are respectively connected with a plurality of main reinforcing steel bars, and the extension sounding pipes are respectively connected and communicated with a plurality of bottom sounding pipes correspondingly.

Compared with the prior art, the construction method for hoisting and positioning the sounding pipe of the foundation pit reverse construction method cast-in-place pile comprises the steps of connecting the sounding pipe with the steel reinforcement cage, firstly putting the sounding pipe at the bottom into the steel reinforcement cage, then connecting the lengthened steel reinforcement with the main reinforcement, and connecting the lengthened sounding pipe on the sounding pipe at the bottom, so that the full-length arrangement and burying of the sounding pipe can be quickly realized, the verticality requirement of downward installation of the steel reinforcement cage is effectively met, the use amount of the steel reinforcement is reduced, the construction cost is reduced, the lengthening installation efficiency of the sounding pipe is improved, and the cost is saved.

Drawings

FIG. 1 is a schematic flow chart of a construction method for hoisting and positioning an acoustic pipe of a foundation pit reverse cast-in-place pile provided by the invention;

FIG. 2 is a schematic front view of a reinforcement cage disposed in a pile hole and an elongated sounding pipe according to the present invention;

FIG. 3 is a schematic front view of an elongated sounding pipe hoisted by a crane according to the present invention and butted with a bottom sounding pipe;

FIG. 4 is an enlarged partial schematic view of FIG. 3;

FIG. 5 is a schematic perspective view of a steel cage according to the present invention;

fig. 6 is a schematic front view of the connection between the elongated acoustic pipe and the elongated steel bar according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Referring to fig. 1-6, preferred embodiments of the present invention are shown.

The construction method for hoisting and positioning the sound measurement pipe of the foundation pit reverse cast-in-place pile is characterized by comprising the following construction steps:

1) Digging a pile hole 100 to a set elevation by rotary excavating from the ground, inserting a pile casing into the pile hole 100, extending the top of the pile casing to the ground, and supporting the pile hole 100 by the pile casing;

2) Manufacturing a reinforcement cage 101, wherein a bottom sounding pipe 202 is fixed on the inner side of a main reinforcement of the reinforcement cage 101, and the bottom sounding pipe 202 extends along the axial direction of the main reinforcement; the reinforcement cage 101 is suspended and is put into the pile hole 100, and the top of the bottom sounding pipe 202 is exposed on the ground;

3) Hoisting the elongated steel bar 203 to the position above the steel bar cage 101, wherein the elongated steel bar 203 is connected with an elongated sounding pipe 201, and the elongated sounding pipe 201 extends along the axial direction of the elongated steel bar 203; fixedly connecting the lengthened steel bars 203 with the main bars, fixedly connecting and communicating the lengthened sounding pipe 201 with the bottom sounding pipe 202, wherein the length of the connected lengthened sounding pipe 202 and the lengthened sounding pipe 201 is greater than the depth of the pile hole 100; thus, the bottom sounding pipe 202 is communicated with the elongated sounding pipe 201 and is arranged along the axial extension of the pile hole 100 to form a complete sounding pipe;

4) The reinforcement cage 101 is lowered to the bottom of the pile hole 100, the top of the elongated sounding pipe 201 is exposed above the pile hole 100, and the elongated reinforcement 203 and the pile casing are kept relatively fixed;

5) And pouring concrete into the pile hole 100 to form a poured pile section at the lower part of the pile hole 100.

According to the foundation pit reverse construction method cast-in-place pile sounding pipe hoisting and positioning construction method, the bottom sounding pipe 202 is firstly put into the foundation pit reverse construction method through being connected with the steel reinforcement cage 101, the extension steel bars 203 are then connected with the main steel bars, the extension sounding pipe 201 is connected to the bottom sounding pipe 202, the through-length arrangement and burying of the sounding pipe can be rapidly achieved, the verticality requirement of downward installation of the steel reinforcement cage 101 is effectively met, the using amount of the steel bars is reduced, the construction cost is reduced, the sounding pipe extension installation efficiency is improved, and the cost is saved.

In the construction step 1), in the rotary drilling process, a soil layer section is drilled by adopting a rotary drilling bucket, and a rock layer section is replaced by a cutting tooth barrel drill until the drilling hole is formed to the designed rock-entering depth; meanwhile, the slag dragging operation is carried out for multiple times of circulating construction, and the drilling efficiency is ensured. During drilling and pore forming, high-quality slurry is adopted to protect the wall, and the wall of the pore is always kept stable. And after the final hole is drilled, performing pile bottom hole cleaning operation by adopting a rotary excavating slag salvaging drilling bucket, and if more drilling slag is found in the drill bit, repeatedly salvaging slag and cleaning the hole for many times until the drilling slag at the bottom of the hole is thoroughly cleaned.

In the construction step 2), the reinforcement cage 101 is processed and manufactured according to the length of the cast-in-place pile to be formed, and the bottom sounding pipe 202 is installed according to the design requirement. Before the bottom acoustic pipe 202 is installed, the sealing ring at the bell and spigot end of the bottom acoustic pipe 202 is confirmed to be intact, and no burrs exist inside and outside the insertion end, so that the sealing ring is prevented from being cut when the intubation tube is installed, and the airtightness of the tube body is not influenced.

In the construction step 2), the bottom and the top of the bottom sounding pipe 202 are closed. The bottom sounding pipe 202 is bound and fixed on the inner side of the main rib, the distance between the fixing points is generally not more than 2m, and the fixing points are arranged at the bottom end of the bottom sounding pipe 202 and the joint part.

The bottom of the bottom sounding pipe 202 is sealed to prevent slurry leakage, and after the bottom sounding pipe 202 is installed in full length, the top of the bottom sounding pipe 202 is sealed to prevent the pore channel from being blocked due to impurities falling in.

In the process of putting the reinforcement cage 101 into the pile hole 100, the special lifting hook is adopted for multi-point lifting and placing, and temporary protection measures are adopted, so that the whole reinforcement cage 101 is kept in a stable state in the lifting process, the hole position is aligned when the orifice of the reinforcement cage 101 is lifted, the lifting is straight and stable, and the pile hole 100 is slowly put into the pile hole.

The bottom of the bottom sounding pipe 202 is located above the bottom of the main rib, and the top of the bottom sounding pipe 202 is located below the top of the main rib. Like this, steel reinforcement cage 101 is placed behind the bottom in stake hole 100, avoids the bottom of bottom sounding pipe 202 and the direct butt in bottom of stake hole 100, and secondly, avoids the top of main muscle to cross at the top of bottom sounding pipe 202 to at the in-process of allocation and transportation steel reinforcement cage 101, cause the collision damage to the top or the bottom of bottom sounding pipe 202.

In the construction step 2), in the process of putting the reinforcement cage 101 into the pile hole 100, when the top of the reinforcement cage 101 is close to the hole opening, a transverse rod penetrates through the upper part of the reinforcement cage 101, the transverse rod penetrates between stirrups of the reinforcement cage 101, the transverse rod stretches across the top of the pile casing to hang the reinforcement cage 101 in the pile hole 100, and the top of the reinforcement cage 101 is exposed, so that the lengthening installation of the sounding pipe 201 in a subsequent hollow hole section is facilitated.

In the construction step 3), a temporary hook 206 is arranged at the lower part of the elongated steel bar 203, the temporary hook 206 extends upwards, the temporary hook 206 is inserted into the bottom of the elongated sound measuring tube 201 to temporarily fix the elongated sound measuring tube 201, a plurality of iron wire rings are hooped between the elongated sound measuring tube 201 and the elongated steel bar 203 and are arranged at intervals along the axial direction of the elongated steel bar 203, and the iron wire rings can limit the relative radial movement between the elongated sound measuring tube 201 and the elongated steel bar 203, but do not limit the relative axial movement between the elongated sound measuring tube 201 and the elongated steel bar 203, that is, the elongated sound measuring tube 201 can move up and down axially relative to the elongated steel bar 203 under the limitation of the iron wire rings.

Through temporary hook 206, extension sounding pipe 201 can be fixed on extension reinforcing bar 203 temporarily relatively, and it can restrict extension sounding pipe 201 and move down.

After the elongated steel bar 203 and the main bar are fixed, the elongated sound measurement tube 201 is moved upwards, the bottom of the elongated sound measurement tube 201 is disconnected from the temporary hook 206, then the temporary hook 206 is cut off, at the moment, the elongated sound measurement tube 201 can move up and down relative to the elongated steel bar 203, and the bottom of the elongated sound measurement tube 201 is fixedly butted and communicated with the top of the bottom sound measurement tube 202.

Welding a conversion hook 207 on the elongated steel bar 203, wherein the conversion hook 207 extends upwards, and the conversion hook 207 is positioned above the temporary hook 206; a pull rope 210 striding over the conversion hook 207 is provided, the elongated sound tube 201 is provided with a pulling position, the pulling position is positioned below the conversion hook 207, one end of the pull rope 210 is connected with the pulling position of the elongated sound tube 201, the other end of the pull rope 210 is pulled downwards, the elongated sound tube 201 moves upwards relative to the elongated steel bar 203, and the bottom of the elongated sound tube 201 is separated from the temporary hook 206.

In this way, after the elongated steel bar 203 is lifted and lowered to the upper side of the steel bar cage 101, one end of the pulling rope 210 is connected to the lifting position of the elongated sound tube 201, the pulling rope 210 crosses over the conversion hook 207, at this time, the other end of the pulling rope 210 is pulled downward, and the whole elongated sound tube 201 moves upward by the lifting of the pulling rope 210 until the elongated sound tube 201 is disconnected from the temporary hook 206.

After the elongated sound measuring tube 201 is disconnected from the temporary hook 206, the bottom of the elongated sound measuring tube 201 is deviated from the temporary hook 206, the temporary hook 206 is cut off, and the other end of the pull rope 210 is slowly released, at this time, under the action of gravity of the elongated sound measuring tube 201, the bottom of the elongated sound measuring tube 201 slowly moves downwards until the bottom of the elongated sound measuring tube 201 reaches the top of the bottom sound measuring tube 202, so that the elongated sound measuring tube 201 is butted with the bottom sound measuring tube 202.

The pulling position of the elongated sound tube 201 is provided with a pulling hook 208, the pulling hook 208 extends downwards, and one end of a pulling rope 210 spans over the conversion hook 207 and then is connected to the pulling hook 208. Thus, one end of the pull rope 210 is connected to the pulling position of the elongated sounding pipe 201.

In this embodiment, the conversion hook 207 and the temporary hook 206 are respectively disposed on two sides of the elongated steel bar 203 and are disposed away from each other, so in the construction step 3), one end of the pull rope 210 is connected to the pulling position of the elongated sounding pipe 201, and the other end of the pull rope 210 bypasses the elongated sounding pipe 201 and then crosses the conversion hook 207, so that in the process of pulling the pull rope 210 downward or slowly releasing the pull rope 210, because the pull rope 210 bypasses the outer periphery of the elongated sounding pipe 201 between the pulling hook 208 and the conversion hook 207, the friction force between the pull rope 210 and the elongated sounding pipe 201 can be increased, the pulling force for pulling the pull rope 210 is reduced, and in the process of slowly releasing the pull rope 210, the phenomenon that the elongated sounding pipe 201 instantaneously moves downward too much can not occur.

In this embodiment, the periphery of the sounding pipe is provided with three positioning protrusions 209, the three positioning protrusions 209 are arranged between the lifting hook 208 and the conversion hook 207, the three positioning protrusions 209 are sequentially arranged at intervals along the axial direction of the elongated sounding pipe 201, and a winding positioning channel is formed between the adjacent positioning protrusions 209.

Like this, when stay cord 210 twines and connects long sounding pipe 201, stay cord 210 walks around two winding location passageways that three location arch 209 formed according to the preface from bottom to top to, can twine the location to the middle part of stay cord 210, avoid the pulling of stay cord 210 or the in-process that slowly relaxs, the phenomenon that the position misplaced appears in stay cord 210.

After the bottom sounding pipe 202 and the extension sounding pipe 201 are butted, in order to enhance the firm connection between the extension sounding pipe 201 and the extension reinforcing steel bar 203, a welding fixing hook and an iron wire binding are added, so that the follow-up integral hoisting together with the reinforcing cage 101 is ensured to be stably carried out.

The two ends of the fixed hook are respectively welded and fixed with the lengthening acoustic pipe 201 and the lengthening steel bar 203 correspondingly, and the middle part of the fixed hook is arranged between the lengthening acoustic pipe 201 and the lengthening steel bar 203 and is arched upwards and arranged in a bending way.

The upper part of the extension steel bar 203 is provided with a lifting lug 204, and in the construction step 3), the lifting lug 204 of the extension steel bar 203 is connected with a crane 300, so that the extension steel bar 203 is lifted above the reinforcement cage 101.

The upper part of the lengthened steel bar 203 is connected with a hanging joint 205, the hanging joint 205 and the lifting lug 204 are arranged at the same height, and the hanging joint 205 and the lifting lug 204 are oppositely arranged by taking the lengthened steel bar 203 as a symmetrical axis; in the construction step 4), after the lower part of the reinforcement cage 101 reaches the bottom of the pile hole 100, the hanging joint 205 is hung at the top of the pile casing, the top of the lengthened reinforcement 203 is temporarily fixed, and a gap is formed between the lengthened sounding pipe 201 and the pile casing.

After the bottom sounding pipe 202 and the elongated sounding pipe 201 are connected in a butt joint mode, a complete sounding pipe is formed, clear water is injected into an orifice of the elongated sounding pipe 201, after the complete sounding pipe is filled with water, the elongated sounding pipe 201 and the reinforcement cage 101 are integrally hung to the position of the pile hole 100 through a crane, and the hanging connector 205 is hung on the pile casing.

In the construction step 5), the length of the piping is determined on site according to the depth of the pile hole 100, the concrete pouring guide pipe is slowly put down, the verticality control during the putting of the guide pipe is noticed, and the phenomenon that the bottom sounding pipe 202 and the lengthened sounding pipe 201 are damaged due to the fact that the guide pipe is inclined or greatly shaken is avoided.

Before concrete is poured, sediment at the bottom of the hole is measured, secondary hole cleaning is carried out, and protection on the bottom sounding pipe 202 and the lengthened sounding pipe 201 is paid attention to during hole cleaning. The concrete pouring adopts an underwater guide pipe back-jacking pouring method, the pouring mode can adopt a discharge port of a concrete tank truck to directly discharge materials according to field conditions, or adopts pouring bucket crane pouring, and the slow operation is noticed during the steps of disassembling and lifting the pipes, so as to ensure that the bottom acoustic pipe 202 and the extension acoustic pipe 201 are effectively protected.

After the pile body concrete is poured, the pile casing is pulled out, the whole process is slowly operated, the pulling verticality is guaranteed, and the phenomenon that the bottom sounding pipe 202 and the extension sounding pipe 201 are broken due to collision when the pile casing is pulled out is avoided.

The reinforcement cage 101 has a plurality of main reinforcements, and the plurality of main reinforcements are correspondingly connected with a plurality of bottom sounding pipes 202; in construction step 3), a plurality of extension bars 203 and a steel cage 500 are provided, each extension bar 203 is connected with the extension sounding pipe 201, the steel cage 500 is horizontally arranged and is connected with the crane 300 through an upper steel wire 401, the plurality of extension bars 203 are connected with the steel cage 500 through a lower steel wire 402, and the plurality of extension bars 203 are arranged in a surrounding manner.

The crane 300 lifts the plurality of elongated steel bars 203 to the upper side of the steel bar cage 101 through the lifting steel cage frame 500, the plurality of elongated steel bars 203 are respectively connected with the plurality of main bars, and the plurality of elongated sounding pipes 201 are respectively connected and communicated with the plurality of bottom sounding pipes 202 correspondingly.

Like this, utilize steel cage 500 can once only lift by crane a plurality of extension reinforcing bars 203 simultaneously and correspond a plurality of extension sounding pipes 201, like this, can realize a plurality of extension sounding pipes 201 correspond with the butt joint operation between a plurality of bottom sounding pipes 202.

In this embodiment, the steel cage 500 includes a ring plate 501 surrounding the ring shape, the ring plate 501 is disposed longitudinally, the ring plate 501 surrounds to form a surrounding area, the ring plate 501 is provided with a plurality of upper connecting holes 502, the upper steel wires 401 are connected to the upper connecting holes 502, and after the upper ends of the upper steel wires 401 are collected, the upper steel wires are connected to the crane 300, so that the crane 300 can lift the steel cage.

The annular plate 501 is provided with a plurality of lower connecting holes 503, the lower connecting holes 503 are connected with lower steel wires 402, and the lower connecting holes 503 are connected with the lengthening steel bars 203 through the lower steel wires 402, so that the plurality of lengthening steel bars 203 can be connected to the steel cage 500, and after the crane 300 lifts the steel cage 500 through the upper steel wires 401, the plurality of lengthening steel bars 203 are lifted together.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (2)

1. The construction method for hoisting and positioning the sound measurement pipe of the cast-in-place pile of the foundation pit by the reverse construction method is characterized by comprising the following construction steps of:

1) Digging a pile hole to a set elevation by the ground in a rotary mode, wherein a pile casing is arranged in the pile hole in a descending mode, and the top of the pile casing extends to the ground;

2) Manufacturing a reinforcement cage, wherein a bottom sounding pipe is fixed on the inner side of a main rib of the reinforcement cage, and the bottom sounding pipe extends along the axial direction of the main rib; the reinforcement cage is suspended and lowered into the pile hole, and the top of the bottom sounding pipe is exposed on the ground;

3) Hoisting the elongated steel bar to the position above the steel bar cage, wherein the elongated steel bar is connected with an elongated sounding pipe which extends along the axial direction of the elongated steel bar; fixedly connecting the extension reinforcing steel bars with the main reinforcing steel bars, fixedly connecting and communicating the extension sounding pipes with the bottom sounding pipe, wherein the length of the bottom sounding pipe after being connected with the extension sounding pipe is larger than the depth of the pile hole;

4) The reinforcement cage is placed to the bottom of the pile hole, the top of the elongated sounding pipe is exposed above the pile hole, and the elongated reinforcement and the pile casing are kept relatively fixed;

5) Pouring concrete into the pile hole to form a poured pile section at the lower part of the pile hole;

in the construction step 2), the bottom and the top of the bottom sounding pipe are sealed;

in the construction step 2), in the process of putting a reinforcement cage into a pile hole, a transverse rod penetrates through the upper part of the reinforcement cage, the transverse rod penetrates through hoops of the reinforcement cage, the transverse rod stretches across the top of a pile casing, and the reinforcement cage is hung in the pile hole;

in the construction step 3), a temporary hook is arranged at the lower part of the elongated steel bar, the temporary hook extends upwards and is inserted into the bottom of the elongated sounding pipe to temporarily fix the elongated sounding pipe, a plurality of iron wire rings are hooped between the elongated sounding pipe and the elongated steel bar and are arranged at intervals along the axial direction of the elongated steel bar;

after the elongated steel bars and the main bars are fixed, the elongated sounding pipe is moved upwards, so that the bottom of the elongated sounding pipe is disconnected from the temporary hook, and the bottom of the elongated sounding pipe is fixedly butted and communicated with the top of the bottom sounding pipe;

welding a conversion hook on the elongated steel bar, wherein the conversion hook extends upwards and is positioned above the temporary hook; a pull rope striding over the conversion hook is arranged, the lengthening sound measuring tube is provided with a lifting position, the lifting position is positioned below the conversion hook, one end of the pull rope is connected with the lifting position of the lengthening sound measuring tube, the other end of the pull rope is pulled downwards, the lengthening sound measuring tube moves upwards relative to the lengthening steel bar, and the bottom of the lengthening sound measuring tube is separated from the temporary hook;

a lifting hook is arranged at the lifting position of the elongated sound measuring tube, the lifting hook extends downwards, and one end of the pull rope spans the conversion hook and is connected to the lifting hook;

the conversion hook and the temporary hook are respectively arranged on two sides of the elongated steel bar and are arranged in a manner of deviating from each other;

the periphery of the sounding pipe is provided with three positioning bulges, the three positioning bulges are arranged between the lifting hook and the conversion hook, the three positioning bulges are sequentially arranged at intervals along the axial direction of the elongated sounding pipe, and a winding positioning channel is formed between the adjacent positioning bulges;

lifting lugs are arranged at the upper parts of the lengthened steel bars, and in the construction step 3), the lengthened steel bars are lifted above the steel bar cage by connecting a crane with the lifting lugs of the lengthened steel bars;

the upper part of the lengthened steel bar is connected with a hanging joint, the hanging joint and the lifting lug are arranged at the same height, and the hanging joint and the lifting lug are oppositely arranged by taking the lengthened steel bar as a symmetrical shaft; in the step 4), after the reinforcement cage is lowered to the bottom of the pile hole, the hanging joint is hung at the top of the pile casing, the top of the lengthened reinforcement is temporarily fixed, and a gap is reserved between the lengthened sounding pipe and the pile casing;

the steel bar cage is provided with a plurality of main bars, and the plurality of main bars are correspondingly connected with a plurality of bottom sounding pipes; in the construction step 3), a plurality of elongated steel bars and a steel cage are arranged, each elongated steel bar is connected with the elongated sounding pipe, the steel cage is horizontally arranged and connected with a crane, the plurality of elongated steel bars are connected with the steel cage through lower steel wires, and the plurality of elongated steel bars are arranged in a surrounding manner;

the crane lifts a plurality of the extension reinforcing steel bars to the upper part of the reinforcing cage through lifting the steel cage frame, the extension reinforcing steel bars are respectively connected with a plurality of main reinforcing steel bars, and the extension sounding pipes are respectively connected and communicated with a plurality of bottom sounding pipes correspondingly.

2. The foundation pit reverse construction method cast-in-place pile sounding pipe hoisting and positioning construction method according to claim 1, wherein the bottom of the bottom sounding pipe is located above the bottom of the main rib, and the top of the bottom sounding pipe is located below the top of the main rib.

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