CN111677022A - A device for detecting the thickness of the sediment before the cast-in-place pile is formed - Google Patents

Abstract

The invention discloses a slag thickness detection device before a cast-in-place pile is formed, which comprises a connecting rod, a first threaded disk, a second threaded disk and a torsion mechanism. , The drill bits are connected in sequence from top to bottom, the first threaded disk and the second threaded disk are both sleeved on the connecting rod, four pins are inserted in an array on the first threaded disk, and a scale is also vertically arranged on the first threaded disk The indicator board and the torsion mechanism include a torsion column, a dial and a positioning column, the dial and the torsion column are sequentially sleeved on the positioning column, and the dial, the torsion column and the positioning column are connected by a limiter. Each component of the device is light in weight and is an assembled component, which is easy to carry; the component has strong stability during the measurement process, which can reduce measurement errors; the component has high sensitivity and can accurately distinguish whether the drill bit crosses the sediment layer into the holding force layer.

Description

A device for detecting the thickness of the sediment before the cast-in-place pile is formed

technical field

The invention belongs to the technical field of construction of cast-in-place piles for building foundations of construction projects, and particularly relates to a device for detecting the thickness of sediment before the cast-in-place piles are formed into piles.

Background technique

In the past ten years, with the development of the construction industry, there are more and more super high-rise buildings in our country, and when the super high-rise buildings appear in places with poor soil quality, pile foundations need to be used. Relatively large, among which cast-in-place piles are widely used. Compared with other piles such as prefabricated piles, the biggest disadvantage of cast-in-place piles is that the sediment at the bottom of the hole cannot be completely removed. If the sediment at the bottom of the hole is too thick, there will be quality problems such as insufficient bearing capacity, excessive pile position deviation, and excessive pile hole inclination. Problems are often fatal because after piling up, it will be difficult to meet design requirements and difficult to remedy. Therefore, it can be known that the sediment is the main factor affecting the bearing capacity of the pile foundation. Too thick sediment will lead to a maximum loss of more than 80% in end resistance and more than 70% in lateral resistance. Therefore, the thickness of sediment must be strictly controlled. Foundation Technical Specifications (JGJ94-2008) stipulates: Before pouring concrete, the thickness of the sediment at the bottom of the hole should not be greater than 50mm for end-bearing piles; it should not be greater than 100mm for friction-type piles; greater than 200mm. In order to measure the accurate sediment thickness to ensure that the pile can meet the design requirements as much as possible, it is necessary to use a sediment thickness detection device to measure the sediment thickness.

At present, the methods of measuring the thickness of sediment are mainly divided into heavy hammer method, ultrasonic method and sampling box detection method. The heavy hammer (generally ≥1 kg) used in the hammer measurement method should not be too large in size. Using the same hanging hammer and the same hanging method, sink the ball into the mud in the hole, lower it slowly, and judge the position of the top surface of the sediment by the operator's hand feel. When the hammer ball reaches the top surface of the sediment, record the position in time The length Hc of the measuring rope is then compared with the drilling depth Hz, and the difference ΔH between the two values is the thickness of the sediment. This method is more intuitive and convenient to detect the sediment thickness at the bottom of the hole, but in the specific operation, the influence of human factors is large, and the measurement accuracy is poor, so this method is generally not used in large and important projects. The ultrasonic method uses sound wave conversion to measure the thickness of the sediment, and the measurement results are relatively accurate, but the cost of using ultrasonic instruments is too high, which is not suitable for large-scale use. The sampling box detection method is to hang the sampling box to the bottom of the hole after the hole is cleaned, and measure the thickness of the slag deposited in the box before the concrete is poured. This method is troublesome to operate on-site, and the uncertainty factors are large, resulting in low measurement accuracy.

SUMMARY OF THE INVENTION

The present invention proposes a device for detecting the thickness of the slag before the cast-in-place pile is formed, so as to solve the problems raised in the above-mentioned background art. The technical scheme of the present invention is realized as follows:

A device for detecting the thickness of sediment before the cast-in-place pile is formed, comprising a connecting rod, a first threaded disk, a second threaded disk and a torsion mechanism, the connecting rod includes a polished rod, a threaded rod and a drill bit, the torsion mechanism, the threaded rod, the polished rod , The drill bits are screwed in sequence from top to bottom, the first threaded disk and the second threaded disk are both sleeved on the connecting rod, and the first threaded disk is threaded on the threaded rod, and the first threaded disk is threaded on the threaded rod. Two threaded discs are threadedly connected to the drill bit, four pins are inserted in an array on the first threaded disc, and a scale indicator plate is also vertically arranged on the first threaded disc. The torsion mechanism includes a torsion column, a scale The dial and the positioning column, the dial and the torsion column are sequentially sleeved on the positioning column, the dial is located between the torsion column and the positioning column, the torsion column is screwed on the positioning column by bolts, the The dial is connected with the torsion column and the positioning column through the limiter.

In the device for detecting the thickness of slag before the cast-in-place pile is formed of the present invention, the limiting member includes a first steel ball, a second steel ball and a first spring, the outer ring of the positioning column is in the shape of a stepped column, the dial, the torsion column They are all sleeved on the small diameter column of the positioning column, the bottom array of the torsion column is provided with four rectangular grooves, the upper end surface of the positioning column is provided with four steel ball grooves, and the first steel ball is pressed against the first spring. is placed in the rectangular groove, and the second steel ball is placed in the steel ball groove.

In the device for detecting the thickness of the slag before the cast-in-place pile is formed, the upper end surface of the dial is provided with four first arc steel ball grooves corresponding to the rectangular grooves, and the lower end surface is provided with four second steel ball grooves corresponding to the steel ball grooves. Curved steel ball groove.

In the device for detecting the thickness of the slag before the cast-in-place pile is formed, the first threaded disc is provided with a bump, and the bump is provided with a scale indicating plate slot and an elastic member installation groove, and the two elastic members are installed Slots are symmetrically arranged on both sides of the scale indicator board slot, the scale indicator board is clamped in the scale indicator board slot by an elastic pressure piece, the elastic pressure piece is placed in the elastic pressure piece installation slot, and the elastic pressure piece It includes a pressure plate and a second spring, two ends of the second spring are respectively fixedly connected to the first threaded plate and the pressure plate, and the scale indicating plate is sandwiched between the two pressure plates.

In the device for detecting the thickness of the slag before the cast-in-place pile of the present invention is formed, the number of the polished rods is more than one.

In the device for detecting the thickness of the slag before the cast-in-place pile is formed, the scale indicator plate stands beside the scale plate, the scale indicator plate is provided with a vertical scale on the side near the scale plate, and the scale indicator plate is provided with Circumferential scale.

In the device for detecting the thickness of the slag before the cast-in-place pile is formed of the present invention, two symmetrical torsion bars are arranged on the side of the torsion column.

In the device for detecting the thickness of the slag before the cast-in-place pile is formed, the threaded rod is provided with a large thread, and the lower end of the drill bit is provided with a small thread.

Implementing the device for detecting the thickness of slag before the cast-in-place pile of the present invention has the following beneficial effects:

(1) The components of the device are light in weight and are assembled components, which are easy to carry; the component has strong stability during the measurement process, which can reduce measurement errors; the component has high sensitivity and can accurately distinguish whether the drill bit crosses the sediment layer into the holding layer.

(2) The cooperative use of the first threaded disk and the pin provides effective support for the entire device, which is convenient for the torsion mechanism to exert force, and the thickness of the sediment layer can be obtained according to the moving distance of the first threaded disk on the threaded rod;

(3) The setting of the second threaded disk can sense the sediment to be settled before the measurement, and isolate the drill bit above the sediment layer. Accurate measurement of sediment layer thickness;

(4) The setting of the torsion mechanism can increase the sensitivity of the device, and can quickly judge whether the drill bit is in contact with the bearing layer, so as to achieve the purpose of accurately measuring the thickness of the sediment layer;

(5) The setting of the bumps and the elastic pressure piece makes the scale indicator plate can be easily installed on the first threaded plate, and can flexibly adjust the up and down position, and adjust the scale indicator according to the position of the first threaded plate during measurement. The upper and lower positions of the plate make a certain integer scale line or zero scale line of the scale indicator plate align with the top surface of the dial, which is convenient to read the accurate downward displacement of the connecting rod 1, so as to obtain the accurate sediment layer depth.

Description of drawings

Fig. 1 is the working schematic diagram of the sediment thickness detection device before the cast-in-place pile of the present invention;

Fig. 2 is the sectional view of the sediment thickness detection device before the cast-in-place pile of the present invention is formed;

Fig. 3 is the sectional view of the torsion mechanism of the present invention;

FIG. 4 is a schematic structural diagram of another direction of the connection between the first threaded disc and the scale indicator plate of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in Figures 1 to 4, a device for detecting the thickness of slag before the cast-in-place pile is formed includes a connecting rod 1, a first threaded disk 2, a second threaded disk 3 and a torsion mechanism 4. The connecting rod 1 includes a polished rod 11, a thread Rod 12 and drill bit 13, the bottom of drill bit 13 is in the shape of a cross cone, and the torsion mechanism 4, threaded rod 12, polished rod 11, and drill bit 13 are connected in sequence from top to bottom. A plurality of polished rods can be spliced to meet the requirements of the pile depth. The first threaded disk 2 and the second threaded disk 3 are both sleeved on the connecting rod 1. The threaded rod 12 is provided with a large thread, and the lower end of the drill bit 13 is provided with a small thread. A threaded disk 2 is threadedly connected to the threaded rod 12, the second threaded disk 3 is threadedly connected to the drill bit 13, the first threaded disk 2 is inserted with four pins 5 in an array, and the first threaded disk 2 is also vertically provided with a scale The indicator plate 7, the scale indicator plate 7 stands beside the scale plate 42, the scale indicator plate 7 is provided with a vertical scale on the side near the scale plate 42, the scale plate 42 is provided with a circumferential scale, and the torsion mechanism 4 includes a torsion column 41, a scale plate 42 and the positioning column 43, two symmetrical torsion bars 412 are arranged on the side of the torsion column 41, the dial 42 and the torsion column 41 are sequentially sleeved on the positioning column 43, and the dial 42 is located between the torsion column 41 and the positioning column 43. 41 is screwed on the positioning column 43 by the bolt 6, and the dial 42 is connected with the torsion column 41 and the positioning column 43 by the limiting member 44. The cooperative use of the first threaded disk 2 and the pin 5 provides effective support for the entire device, which is convenient for the torsion mechanism 4 to exert force, and the thickness of the sediment layer can be obtained according to the moving distance of the first threaded disk 2 on the threaded rod 12; the second The setting of the threaded disk 3 can sense the slag to be deposited before the measurement, and isolate the drill bit 13 above the sediment layer, and before the measurement, the bottom of the second threaded disk 3 and the bottom of the drill bit 13 are on the same level, that is, close to the sediment, which is convenient for the sediment Accurate measurement of layer thickness; the setting of the torsion mechanism 4 can increase the sensitivity of the device, and can quickly determine whether the drill bit 13 is in contact with the bearing layer, so as to achieve the purpose of accurately measuring the thickness of the sediment layer.

The limiter 44 includes a first steel ball 441, a second steel ball 442 and a first spring 443. The outer ring of the positioning column 43 is in the shape of a stepped column. The dial 42 and the torsion column 41 are all sleeved on the small diameter column of the positioning column 43. The bottom array of 41 is provided with four rectangular grooves 411, the upper end face of the positioning column 43 is provided with four steel ball grooves 431, the first steel ball 441 and the first spring 443 are pressed into the rectangular groove 411, and the second steel ball 442 is placed in the steel ball groove In 431 , the upper end surface of the dial 42 is provided with four first arc-shaped steel ball grooves corresponding to the rectangular grooves 411 , and the lower end surface is provided with four second arc-shaped steel ball grooves corresponding to the steel ball grooves 431 . The rotation of the torsion bar 412 can not only drive the connecting rod 1 to rotate forward and enter the sediment layer, but also due to the different magnitude of the applied torsion force, the rotation arc of the dial 42 will be different, and the reading scale increase degree will also be different, so it can also pass the dial. The degree of increase of the 42 scale is used to judge whether the connecting rod 1 enters the force-holding layer from the sediment layer. When it contacts the force-holding layer, the torsion force exerted on the torsion bar 412 increases rapidly, and the reading pointed by the scale indicator plate 7 also increases rapidly.

The first threaded disc 2 is provided with a convex block, and the convex block is provided with a scale indicating board slot 21 and an elastic pressing piece mounting slot 22. The two elastic pressing piece mounting slots 22 are symmetrically arranged on both sides of the scale indicating board slot 21, and the scale indicates The plate 7 is clamped in the scale indicator board slot 21 by the elastic pressing member 8, and the elastic pressing member 8 is placed in the elastic pressing member installation groove 22. The elastic pressing member 8 includes a pressing plate 81 and a second spring 82, and the two ends of the second spring 82 are fixedly connected respectively. The first threaded disc 2 and the pressing plate 81, the scale indicating plate 7 is sandwiched between the two pressing plates 81, and the zero scale of the scale indicating plate 7 is at the uppermost end. The arrangement of the convex block and the elastic pressing piece 8 enables the scale indicator plate 7 to be easily installed on the first threaded disk 2, and can flexibly adjust the up and down position, and adjust the scale according to the position of the first threaded disk 2 during measurement. The upper and lower positions of the indicator plate 7 are such that a certain integer scale line or zero scale line of the scale indicator plate 7 is aligned with the top surface of the dial 42, which is convenient to read the accurate displacement of the downward movement of the connecting rod 1, so as to obtain accurate sediment layer depth.

When measuring, it is necessary to rotate the torsion mechanism 4 to twist the first spring to drive the connecting rod 1 to rotate, so that the rod slowly enters the sediment layer. Every 1 cm of the connecting rod 1 entering the sediment layer can be read on the reading plate of the torsion mechanism 4. What is the force. Because the resistance of the connecting rod 1 in the sediment layer and the force-bearing layer is different, when it is measured that the connecting rod 1 goes deep into 1 cm at a certain time, the force used by the connecting rod 1 increases significantly in the reading disk, which means that the end of the connecting rod 1 And across the sediment layer into the holding layer. In this way, the descending displacement of the connecting rod 1 can be accurately measured, and the connecting rod 1 represents the thickness of the sediment layer.

After the cast-in-place pile is formed into a hole, the connecting rod 1 is spliced together, and then passes through the first threaded disk 2 and the second threaded disk 3 in sequence, and finally a torsion mechanism 4 is installed above the connecting rod 1, and then the device is slowly put into the hole. , until the second threaded disc 3 is in contact with the upper surface of the sediment layer, and the first threaded disc 2 is in contact with the foundation surface, then use the pin 5 to nail the first threaded disc 2 to the foundation surface, and adjust the scale indicator plate 7 up and down to make the scale indication A certain integer scale line of the plate 7 is aligned with the top surface of the dial 42, and the reading A is recorded, and the torque mechanism 4 is started to be applied to make the connecting rod 1 slowly enter the sediment layer. Corresponding readings, until the connecting rod 1 penetrates 1 cm at a certain moment, the reading of the reading plate increases significantly compared with the previous one, which means that the end of the rod begins to enter the holding layer at this time, stop applying force, and read the scale indicator plate again. 7 Reading B, the difference between reading AB is the thickness of the sediment layer that needs to be measured.

Examples are only examples, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. A device for detecting the thickness of slag before a cast-in-place pile is formed into a pile, characterized in that it comprises a connecting rod (1), a first threaded disk (2), a second threaded disk (3) and a torsion mechanism (4), the connection The rod (1) includes a polished rod (11), a threaded rod (12) and a drill bit (13), and the torsion mechanism (4), threaded rod (12), polished rod (11), and drill bit (13) are threaded in sequence from top to bottom The first threaded disk (2) and the second threaded disk (3) are both sleeved on the connecting rod (1), and the first threaded disk (2) is threadedly connected to the threaded rod ( 12), the second threaded disc (3) is threadedly connected to the drill bit (13), and four pins (5) are inserted in an array on the first threaded disc (2). A scale indicator plate (7) is also vertically arranged on the disc (2), and the torsion mechanism (4) includes a torsion column (41), a dial (42) and a positioning column (43). The dial (42), The torsion column (41) is successively sleeved on the positioning column (43), the dial (42) is located between the torsion column (41) and the positioning column (43), and the torsion column (41) passes through the bolt (6). ) is screwed on the positioning column (43), and the dial (42) is connected with the torsion column (41) and the positioning column (43) through a limiting member (44). 2 . The device for detecting the thickness of slag before the cast-in-place pile is formed into a pile according to claim 1 , wherein the limiting member ( 44 ) comprises a first steel ball ( 441 ), a second steel ball ( 442 ) and a first spring ( 2 . 3 . 443), the outer ring of the positioning column (43) is in the shape of a stepped column, the dial (42) and the twist column (41) are all sleeved on the small diameter column of the positioning column (43), and the twist column ( 41) Four rectangular grooves (411) are arranged on the bottom array, and four steel ball grooves (431) are arranged on the upper end face of the positioning column (43). The first steel balls (441) are pressed against the first springs (443). The second steel ball (442) is placed in the rectangular groove (411), and the second steel ball (442) is placed in the steel ball groove (431). 3. The device for detecting the thickness of slag before the cast-in-place pile is formed into a pile according to claim 2, wherein the upper end surface of the dial (42) is provided with four first arc steel ball grooves corresponding to the rectangular grooves (411). , and the lower end surface is provided with four second arc-shaped steel ball grooves corresponding to the steel ball grooves (431). 4. The device for detecting the thickness of the slag before the cast-in-place pile is formed into a pile according to claim 1, wherein a protrusion is provided on the first threaded disk (2), and a scale indicator board slot is provided in the protrusion. (21) and an elastic pressure piece installation groove (22), the two elastic pressure piece installation grooves (22) are symmetrically arranged on both sides of the scale indicating plate slot (21), and the scale indicating plate (7) passes through the elastic pressure piece (8). ) is clamped in the slot (21) of the scale indicator plate, the elastic pressing member (8) is placed in the elastic pressing member mounting groove (22), and the elastic pressing member (8) includes a pressing plate (81) and a second spring (82), the two ends of the second spring (82) are respectively fixedly connected to the first threaded disk (2) and the pressure plate (81), and the scale indicator plate (7) is sandwiched between the two pressure plates (81). 5 . The device for detecting the thickness of slag before the cast-in-place pile is formed into a pile according to claim 1 , wherein the number of the polished rods ( 11 ) is more than one. 6 . 6. The device for detecting the thickness of slag before cast-in-place piles are formed into piles according to claim 1, wherein the scale indicating plate (7) stands beside the scale plate (42), and the scale indicating plate (7) ) The side near the dial (42) is provided with a vertical scale, and the dial (42) is provided with a circumferential scale. 7 . The device for detecting the thickness of slag before the cast-in-place pile is formed into a pile according to claim 1 , wherein two symmetrical torsion bars ( 412 ) are provided on the side of the torsion column ( 41 ). 8 . 8. The device for detecting the thickness of slag before cast-in-place piles are formed into piles according to claim 1, wherein the threaded rod (12) is provided with a large thread, and the lower end of the drill bit (13) is provided with a small thread.

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