CN113174941A

CN113174941A - Follow-up casing suitable for sandy gravel stratum and construction method thereof

Info

Publication number: CN113174941A
Application number: CN202110633015.1A
Authority: CN
Inventors: 冉景军; 马玲玲
Original assignee: Guangxi Guilin Jinqiao Foundation Engineering Co ltd
Current assignee: Guangxi Guilin Jinqiao Foundation Engineering Co ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2021-07-27

Abstract

The invention relates to the technical field of rotary excavating machines, in particular to a follow-up casing suitable for a sandy gravel stratum and a construction method thereof; the follow-up pile casing comprises at least one follow-up pile casing body, wherein a first butt joint and a second butt joint are respectively arranged at two ends of the follow-up pile casing body, the first butt joint and the second butt joint are arranged to enable the two follow-up pile casing bodies to be connected, a clamping block is arranged on the second butt joint, a clamping groove matched with the clamping block is formed in the inner surface of the first butt joint, and a spiral wall is arranged on the outer surface of the follow-up pile casing body; according to the invention, the spiral wall is arranged on the outer surface of the follow-up pile casing, so that the follow-up pile casing can more easily go deep into a sandy gravel stratum, and meanwhile, the repeated follow-up pile casing is pulled out in time in the construction process, so that the engineering construction cost is saved.

Description

Follow-up casing suitable for sandy gravel stratum and construction method thereof

Technical Field

The invention relates to the technical field of rotary excavating machines, in particular to a follow-up casing suitable for a sandy gravel stratum and a construction method thereof.

Background

A protect a section of thick bamboo entirely for construction of sand cobble ground, it is arranged in impacting the stake work progress, because sand cobble layer thickness is thicker, impact stake construction frictional resistance is great, when protecting a section of thick bamboo and sand cobble basis frictional force completely and reach certain size, when hydraulic vibration hammer can not continue to press in protecting a section of thick bamboo entirely, can lead to in the construction to protect a follow-up of a section of thick bamboo entirely often can not target in place along with the construction progress like this, again because the cohesive force ratio of sand cobble is less, protect a section of thick bamboo in all in time in case can't follow-up, the pressure of assaulting the formation often causes the hole of collapsing very easily, thereby lead to the sticking of drill and burying the hammer, bring very big difficulty for the construction progress.

Disclosure of Invention

The invention aims to provide a follow-up casing suitable for a sandy gravel stratum and a construction method thereof, so as to solve the technical problems in the background technology.

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

the utility model provides a follow-up protects a section of thick bamboo suitable for sandy cobble stratum, includes that at least one section of thick bamboo body is followed up and is protected, follow-up protects a body both ends and is first butt joint and second butt joint respectively, the setting up of first butt joint and second butt joint can make two sections follow up and protect a body to meet, be provided with the fixture block on the second butt joint, be provided with on the first butt joint internal surface with fixture block assorted draw-in groove, be provided with the spiral wall on following up and protecting a body surface.

Specifically, the second is to fixedly being provided with spacing bridge on the joint, the fixture block slides under the spacing bridge, spacing bridge both sides wall is seted up the first locking hole of central axis on the collinear, fixture block one end is provided with the second locking hole, adopt the round pin axle to wear to establish spacing bridge and fixture block when first locking hole corresponds with the second locking hole and fix.

Preferably, a first L-shaped limiting block and a second L-shaped limiting block are fixedly arranged on the inner surface of the first butt joint, and a clamping groove is formed in a space between the first L-shaped limiting block and the second L-shaped limiting block.

Preferably, the width of the spiral wall is 20cm, the thickness of the spiral wall is 30mm, and the spiral angle of the spiral wall is 30-40 degrees.

Furthermore, the follow-up protective cylinder body is made of a Q235 manganese steel plate with the thickness of 10mm by rolling with a plate rolling machine.

The invention discloses a follow-up casing construction method suitable for a sandy gravel stratum, which comprises the following steps of:

during construction, firstly, the outer pile casing with the inner diameter larger than that of the follow-up pile casing body is conveyed to a position six meters below a stratum through vibration of a hydraulic hammer, and the outer pile casing cannot be constructed in a follow-up mode;

then, a first section of follow-up casing is sent to the position below a sandy gravel foundation which cannot be followed by an outer casing under the vibration of a hydraulic hammer, and the first section of follow-up casing takes slag and drills the slag into three meters;

then, a second section of follow-up protecting cylinder, a third section of follow-up protecting cylinder and a fourth section of follow-up protecting cylinder sequentially take slag and respectively drill for three meters, and the four sections of follow-up protecting cylinders are enabled to take slag and drill for twelve meters;

and finally, after the four sections of follow-up casing can not drill sand and pebbles, arranging a reinforcement cage and a lower guide pipe, pouring concrete, and vibrating by using a hydraulic hammer to take out the four sections of follow-up casing.

Further, the outer protective sleeve is at least six meters in length, the inner diameter is 1500mm, the inner diameter of the four sections of follow-up protective sleeves is 1000mm, and each section of follow-up protective sleeve is at least three meters in length.

Further, hoisting the steel reinforcement cage into the hole by using a crane, then installing a guide pipe, checking whether the thickness of sediment at the bottom of the hole does not meet the requirement, performing secondary hole cleaning, and filling concrete after meeting the requirement.

Further, when the follow-up pile casing is taken out, the follow-up pile casing is firstly pulled up by 0.5 meter by a hydraulic hammer, concrete is continuously poured to a position which is two meters to six meters higher than the bottom end of the outer pile casing, then the follow-up pile casing is pulled up to enable the bottom end of the follow-up pile casing to be level with the bottom end of the outer pile casing, the outer pile casing is pulled out, and finally the concrete pouring of the residual pile foundation is completed.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the spiral wall is arranged on the outer surface of the follow-up pile casing, so that the follow-up pile casing can more easily go deep into a sandy gravel stratum, and meanwhile, the repeated follow-up pile casing is pulled out in time in the construction process, so that the engineering construction cost is saved; according to the effect of using in a certain building site, the building site adopts a full-rotation construction method to carry out budget according to the existing scheme, the construction unit price is 2300 yuan per meter, and 9200 ten thousand yuan is consumed according to the total project measurement of 40000 meters; by adopting the follow-up pile casing and the construction method, the construction unit price is 800 yuan per meter, only 3200 ten thousand yuan is spent according to the total engineering measurement of 40000 meters, and the cost of 6000 ten thousand is saved.

Drawings

FIG. 1 is a schematic structural view of a follow-up casing suitable for a sandy gravel stratum according to the invention;

fig. 2 is a schematic structural view of a limit bridge and a fixture block according to the present invention.

In the figure: 1. follow-up protects a section of thick bamboo body, 2, first butt joint, 3, second butt joint, 4, fixture block, 5, draw-in groove, 6, spiral wall, 7, spacing bridge, 71, first locking hole, 72, second locking hole, 21, first L type stopper, 22, second L type stopper.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution:

the invention provides a follow-up pile casing suitable for a sandy gravel stratum, which comprises at least one section of follow-up pile casing body 1, wherein a first pair of joints 2 and a second pair of joints 3 are respectively arranged at two ends of the follow-up pile casing body, the first pair of joints 2 and the second pair of joints 3 are arranged to enable the two sections of follow-up pile casing body 1 to be connected, a clamping block 4 is arranged on the second pair of joints 3, a clamping groove 5 matched with the clamping block 4 is arranged on the inner surface of the first pair of joints 2, and a spiral wall 6 is arranged on the outer surface of the follow-up pile casing body 1. In actual construction, when one section of follow-up pile casing is connected with another section, the first pair of joints 2 of the first section of follow-up pile casing is connected with a rotary excavating machine (not shown), the tail ends of the second pair of joints 3 are connected with a cutting tool (not shown), after the section of follow-up pile casing extends into a sand and gravel stratum for one section, the second pair of joints of the second section of follow-up pile casing is connected with the first pair of joints of the first section, when the joint is connected, clamping blocks on the second pair of joints are connected with clamping grooves on the first pair of joints in a clamping mode, then the first pair of joints of the second section of follow-up pile casing is connected with the rotary excavating machine, so that the rotary excavating machine drives the second section of follow-up pile casing to rotate and simultaneously drives the first section of follow-up pile casing to rotate, and the third section of follow-up pile casing and the fourth section of follow-up pile casing are. Because the spiral wall is arranged on the outer surface of the follow-up pile casing, the rotary drilling machine drives the follow-up pile casing to drill into the sandy gravel stratum like a ground drill, and the rotary drilling machine can more easily drive the follow-up pile casing to rotate into the sandy gravel stratum.

In order to better connect each section of follow-up protective casing, the disconnection between two sections of follow-up protective casings due to vibration in the drilling process is avoided, therefore, the second butt joint 3 is fixedly provided with the limiting bridge 7, the fixture block 4 slides under the limiting bridge 7, the two side walls of the limiting bridge 7 are provided with first locking holes 71 with the central axes on the same straight line, one end of the fixture block 4 is provided with a second locking hole 72, and the first locking holes 71 and the second locking holes 72 are fixed by adopting a pin shaft to penetrate through the limiting bridge 7 and the fixture block 4 when corresponding. Because the fixture block 4 is fixedly connected with the limiting bridge 7, and the dead weight of the lower section of the protective sleeve is added, the fixture block cannot be separated from the clamping groove.

As a preferred embodiment of the present invention, a first L-shaped limiting block 21 and a second L-shaped limiting block 22 are fixedly disposed on an inner surface of the first butt joint, and a slot 5 is formed in a space between the first L-shaped limiting block 21 and the second L-shaped limiting block 22, since the latch 4 is connected to the slot 5 to drive the following casing to rotate, the section of the following casing with the slot obtains a greater rotating force. In order to make it easier for the drill to drill a sandy gravel layer when the follow-up casing rotates, the spiral angle of the spiral wall provided on the outer surface of the follow-up casing is set to 30 ° to 40 °, the width of the spiral wall is 20cm (i.e., the distance between the end of the spiral wall and the body of the follow-up casing), and the thickness is 30 mm. The follow-up protective cylinder body is made of a Q235 manganese steel plate with the thickness of 10mm by rolling with a plate rolling machine.

The application example is as follows:

taking the integral moving project of Guilin medical college as an example, the project stratum is located on the mountain road of the overlapped color area in Guilin city, the straight line distance is 1 kilometer away from the side of the dribble river, the project belongs to the original dribble river bed, the geological condition is a full cobble stratum, the grain size is different from 0.5 to 30 centimeters, the underground water level is the dribble water level, the water inflow is large, and the cobble stratum has no structural force.

The method comprises the steps of firstly, conveying an outer protective barrel with the inner diameter of 1500mm and the length of 6 meters below a stratum under vibration of a hydraulic hammer, wherein the outer protective barrel cannot be constructed in a follow-up mode, then forming an inner protective barrel with the length of 12 meters by four sections of follow-up protective barrels with the length of 3 meters under the vibration hammer, and the purpose is to adopt a large vibration hammer to follow up the protective barrel with manganese steel to break pebbles encountered in the process of descending the protective barrel. After the protective cylinder is in place, a crane is used for hoisting the steel reinforcement cage into the hole, then the guide pipe is installed, secondary hole cleaning is carried out when the thickness of sediments at the bottom of the hole is not in accordance with the requirement, and concrete can be poured after the sediment thickness is in accordance with the requirement. When the follow-up pile casing is taken out, the follow-up pile casing is firstly pulled up by 0.5 meter by a hydraulic hammer, concrete is continuously poured to a position which is two meters to six meters higher than the bottom end of the outer pile casing, then the follow-up pile casing is pulled up to enable the bottom end of the follow-up pile casing to be level with the bottom end of the outer pile casing, the outer pile casing is pulled out, and finally the concrete pouring of the residual pile foundation is completed. The project adopts a full-rotation construction method to carry out budget calculation according to the prior scheme, the construction unit price is 2300 yuan per meter, and 9200 ten thousand yuan is consumed according to the total project measurement of 40000 meters; by adopting the follow-up pile casing and the construction method, the construction unit price is 800 yuan per meter, only 3200 ten thousand yuan is spent according to the total engineering measurement of 40000 meters, and the cost of 6000 ten thousand is saved.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a follow-up protects a section of thick bamboo suitable for sandy cobble stratum which characterized in that: including an at least section of thick bamboo body (1) of protecting of following, follow-up protects a body (1) both ends and is first butt joint (2) and second butt joint (3) respectively, the setting up of first butt joint (2) and second butt joint (3) can make two sections follow-up and protect a body (1) to meet, be provided with fixture block (4) on second butt joint (3), be provided with on first butt joint (2) internal surface with fixture block (4) assorted draw-in groove (5), be provided with spiral wall (6) on following a body (1) surface of protecting.

2. A follow-up casing suitable for use in a sandy and pebble formation as claimed in claim 1, wherein: fixed spacing bridge (7) of being provided with on second butt joint (3), fixture block (4) slide under spacing bridge (7), first locking hole (71) of central axis on same straight line are seted up to spacing bridge (7) both sides wall, fixture block (4) one end is provided with second locking hole (72), adopt the round pin axle to wear to establish when first locking hole (71) and second locking hole (72) correspond to fix spacing bridge (7) and fixture block (4).

3. A follow-up casing suitable for use in a sandy and pebble formation as claimed in claim 1, wherein: a first L-shaped limiting block (21) and a second L-shaped limiting block (22) are fixedly arranged on the inner surface of the first butt joint (2), and a clamping groove (5) is formed in the space between the first L-shaped limiting block (21) and the second L-shaped limiting block (22).

4. A follow-up casing suitable for use in a sandy and pebble formation as claimed in claim 1, wherein: the width of the spiral wall (6) is 20cm, the thickness of the spiral wall is 30mm, and the spiral angle of the spiral wall (6) is 30-40 degrees.

5. A follow-up casing suitable for use in a sandy and pebble formation as claimed in claim 1, wherein: the follow-up pile casing body (1) is made of a Q235 manganese steel plate with the thickness of 10mm by rolling with a plate rolling machine.

6. A follow-up casing construction method suitable for a sandy gravel stratum is characterized by comprising the following steps of: the method comprises the following steps:

7. The follow-up casing construction method suitable for the sandy gravel stratum as claimed in claim 6, wherein: the outer protective casing length is six meters at least, and the internal diameter is 1500mm, four sections follow-up protective casing internal diameter is 1000mm, and every section length is three meters at least.

8. The follow-up casing construction method suitable for the sandy gravel stratum as claimed in claim 6, wherein: hoisting the steel reinforcement cage hole by a crane, then installing a guide pipe, checking that the thickness of sediment at the bottom of the hole does not meet the requirement, performing secondary hole cleaning, and filling concrete after meeting the requirement.

9. The follow-up casing construction method suitable for the sandy gravel stratum as claimed in claim 6, wherein: when the follow-up pile casing is taken out, the follow-up pile casing is firstly pulled up by 0.5 meter by a hydraulic hammer, concrete is continuously poured to a position which is two meters to six meters higher than the bottom end of the outer pile casing, then the follow-up pile casing is pulled up to enable the bottom end of the follow-up pile casing to be level with the bottom end of the outer pile casing, the outer pile casing is pulled out, and finally the concrete pouring of the residual pile foundation is completed.