CN215572593U - Device for measuring thickness of sediment at bottom of cast-in-situ bored pile hole - Google Patents
Device for measuring thickness of sediment at bottom of cast-in-situ bored pile hole Download PDFInfo
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- CN215572593U CN215572593U CN202121420878.2U CN202121420878U CN215572593U CN 215572593 U CN215572593 U CN 215572593U CN 202121420878 U CN202121420878 U CN 202121420878U CN 215572593 U CN215572593 U CN 215572593U
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Abstract
The utility model provides a device for measuring the thickness of sediment at the bottom of a hole of a cast-in-situ bored pile, which comprises a base, a probe, a magnetic ring, a drop hammer and a traction rope, wherein the upper part of the probe is connected with the traction rope, the traction rope passes through the drop hammer with the hole, the lower part of the probe passes through the base, the magnetic ring is movably sleeved on the probe, the base comprises a limiting groove, a bottom plate and a guide rail, the limiting groove is arranged on the inner side of the guide rail, and the guide rail is fixedly connected to the upper side of the bottom plate; during measurement, the magnetic ring is reset, the base and the probe are slowly lowered onto the pile bottom sediment, the drop hammer falls to the bottom of the hole along the traction rope after the drop hammer is released and impacts the probe, the magnetic ring is pushed to a certain position by relative sliding of the base and the probe, the measuring device is recovered, and the reading corresponding to the lower edge of the magnetic ring is the thickness of the pile bottom sediment.
Description
Technical Field
The utility model relates to the technical field of pile foundation construction, in particular to a device for measuring the thickness of sediment at the bottom of a bored pile hole.
Background
The cast-in-situ bored pile is widely applied to building foundation engineering due to the characteristics of low construction noise, small vibration influence, high single-pile bearing capacity, wide application range, low cost and the like, the control of the thickness of the sediment at the bottom of the pile in the construction of the cast-in-situ bored pile is vital, and the regulation in the technical Specification of building pile foundations (JGJ 94-2008): drilling to the designed depth, wherein the thickness of sediment at the bottom of the hole is required to meet the following regulation before concrete is poured, and 1) the thickness of the sediment at the bottom of the hole is not more than 50 mm; 2) for friction type piles, the thickness should not be larger than 100 mm; 3) and for the pile resisting pulling and horizontal force, the thickness should not be larger than 200 mm.
The conventional measuring method for the thickness of the pile bottom sediment mainly comprises a probe cake measuring method and a static sounding method. The method for measuring the pin and the cake is characterized in that a measuring pin is firstly put down to measure the depth of a hole bottom, then the depth of the measuring cake is measured as the depth of the top surface of sediment, the difference of the two data is the thickness of the sediment, the measuring pin is two steel bars with the diameter of phi 25, the length of the measuring pin is about 20cm, a small handle is welded on the measuring pin, then the measuring pin is put down to the hole bottom through a thin steel wire rope, the measuring cake is a steel plate with the thickness of about 1cm and the diameter of about 12cm, a hole with the diameter of about 5cm is formed in the center of the steel plate, an equilateral triangle cone formed by three steel bars with the height of about 15cm is welded on the steel plate, a small ring is also welded above the cone to serve as the handle, and then the measuring pin is put down to the hole bottom through the thin steel wire rope. The pin measuring and cake measuring method has a simple processing technology, is widely applied to pile foundation construction, but has large measurement error due to inconsistent measurement points of two times, needs to measure the pin and the cake twice each time, and is quite time-consuming and labor-consuming. The static sounding method is characterized in that a set of static sounding rod with a support is placed to the bottom of a hole, the support is opened and clamped at the bottom of the hole, the static sounding rod starts to perform downward static pressure after a stepping motor is started, the pressure of a hole bottom probe is read through sensing, and the thickness of sediment at the bottom of the hole is obtained according to the change of the obtained pressure value. According to the background information, the existing pile bottom sediment thickness measuring method has certain limitation, is difficult to adapt to the high-speed development infrastructure industry in China, and urgently needs to develop a pile bottom sediment thickness detecting device and method which are convenient to operate, accurate in measurement and low in price.
Disclosure of Invention
The utility model aims to overcome the existing defects and provide a device for measuring the thickness of the sediment at the hole bottom of a cast-in-situ bored pile, aims to conveniently and quickly measure the thickness of the sediment at the pile bottom in pile foundation construction, has the advantages of high precision, convenience and quickness in measurement, low cost, strong adaptability, easiness in popularization and the like, and can effectively solve the problems in the background technology.
In order to achieve the purpose, the utility model specifically adopts the following technical scheme:
a device for measuring the thickness of sediment at the bottom of a bored pile hole comprises a base, a probe, a magnetic ring, a drop hammer and a traction rope; the base comprises a limiting groove, a bottom plate and a guide rail, the guide rail is vertically fixed on the bottom plate, and a hollow pore channel in the guide rail and a central hole of the bottom plate form a guide channel penetrating through the whole base; the limiting groove is formed at the bottom of the guide channel, so that a stepped surface is formed inside the guide channel; the probe comprises a probe guide rod, a probe head and a probe cap, the probe guide rod penetrates through the guide channel, the probe guide rod and the guide channel form a sliding pair limited by the inner wall of the guide rail, the probe head and the probe cap are respectively arranged at the bottom end and the top end of the probe guide rod, the diameter of the end part of the probe head is larger than that of the probe guide rod, and the probe head can be matched with the stepped surface to limit the probe head to further slide in when sliding along the guide channel; the top of the probe cap is connected with a traction rope, and the traction rope passes through a drop hammer with a hole; the probe is made of ferromagnetic materials, the magnetic ring is sleeved on the probe guide rod extending out of the top of the guide rail, the outer diameter of the magnetic ring is larger than the diameter of the hollow pore passage, and the magnetic ring and the probe guide rod can be kept relatively fixed through magnetic attraction under the condition that the magnetic ring is free from external force except gravity.
As a preferred technical scheme of the utility model: the base material is non-ferromagnetic material, and is one of aluminum, copper and stainless steel.
As a preferred technical scheme of the utility model: the diameter of the bottom plate in the base is 15-20 cm, the thickness is 3-6 mm, and the length of the guide rail is 6-10 cm.
As a preferred technical scheme of the utility model: the height of the magnetic ring is 10-20 mm.
As a preferred technical scheme of the utility model: the falling weight is made of one of stainless steel or copper, and the weight of the falling weight is controlled to be 500-1000 g.
As a preferred technical scheme of the utility model: the drop weight is one of spherical, cylindrical and spindle-shaped.
As a preferred technical scheme of the utility model: the probe guide rod is cylindrical, the diameter of the probe guide rod is 8-15 mm, the length of the probe guide rod is 300mm, the diameter of the end portion of the probe head is 2mm larger than that of the probe guide rod, and the diameter of the probe cap is 30-50 mm.
As a preferred technical scheme of the utility model: and the probe guide rod is provided with scale marks.
As a preferred technical scheme of the utility model: the probe head is connected with the probe guide rod through threads, so that the probe head is replaceable.
As a preferred technical scheme of the utility model: the hauling cable is a steel wire rope with a plastic protective layer.
Compared with the prior art, the utility model has the beneficial effects that:
1: the utility model carries out measurement through a mechanical device, has clear measurement principle and convenient and quick measurement, and greatly improves the efficiency of measuring the thickness of the sediment at the bottom of the pile;
2: the measuring device is simple to operate, low in cost, free of power-on and data acquisition and easy to popularize and popularize in pile foundation construction;
3: the measuring device has high measuring precision, and can quickly perform repeated measurement on the same hole bottom for multiple times to obtain an average value, so that the measuring result is more representative;
4: according to the utility model, the appropriate probe head can be replaced according to different soil layer conditions, so that the reality and accuracy of data are ensured.
Drawings
FIG. 1 is a schematic structural diagram of a device for measuring the thickness of sediment at the bottom of a bored pile according to the present invention;
fig. 2 is a three-dimensional perspective view of the device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile.
In the figure: the device comprises a base 1, a 101 limit groove, a 102 bottom plate, a 103 guide rail, a 2 probe, a 201 probe guide rail, a 202 probe head, a 203 probe cap, 204 scale marks, a 3 magnetic ring, a 4 drop hammer, a 5 traction rope, 6 pile bottom sediment and a 7-holding soil layer.
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 and 2, the present invention provides a device for measuring a thickness of a sediment at a bottom of a bored pile hole, which mainly includes a base 1, a probe 2, a magnetic ring 3, a drop hammer 4 and a pulling rope 5. Wherein, the upper portion of probe 2 is connected with haulage rope 5, and haulage rope 5 passes drop 4 with the hole, and base 1 is passed through to probe 2 lower part, and magnetic ring 3 activity cup joints on probe 2. The specific structure and actuation of the various components are described below.
The base 1 comprises a limiting groove 101, a bottom plate 102 and a guide rail 103, wherein the bottom plate 102 is a circular flat plate, and a central hole is formed in the center. The guide rail 103 is a hollow cylindrical section and is vertically fixed on the bottom plate 102, and a hollow hole channel inside the guide rail 103 and a central hole of the bottom plate 102 form a guide channel penetrating through the whole base 1. The purpose of the guide channel is to provide a mounting location for the probe 2. The limiting groove 101 is arranged at the bottom of the guide channel, and the diameter of the limiting groove is enlarged from the bottom of the guide channel, so that a step surface is formed inside the guide channel, and the diameter of the channel below the step surface is larger than that of the channel above the step surface.
The probe 2 comprises a probe guide rod 201, a probe head 202 and a probe cap 203, the probe guide rod 201 is a section of rigid cylinder, the probe guide rod 201 is inserted into the guide channel and penetrates through the guide channel, the diameter of the probe guide rod 201 is slightly smaller than that of a hollow pore channel in the guide rail 103, so that the probe guide rod 201 and the guide channel can form a sliding pair limited by the inner wall of the guide rail 103, and the probe guide rod 201 can slide up and down in the guide channel but cannot move horizontally based on the sliding pair. The probe head 202 and the probe cap 203 are respectively arranged at the bottom end and the top end of the probe guide rod 201. At the bottom of the probe tip 202 is a tip that can be inserted into the earth. The probe cap 203 is a horizontally fixed circular flat plate that serves as a contact surface for the top of the probe 2 to receive the impact of the drop weight 4. The probe cap 203 should be larger in diameter than the rail 103 so that the probe 2 does not slide down off the base 1. Meanwhile, in order to prevent the probe 2 from slipping upwards from the base 1, the diameter of the end part of the probe head 202 is larger than that of the probe guide rod 201, but the diameter of the end part of the probe head 202 is smaller than that of the limiting groove 101, so that the probe head 202 can be matched with the stepped surface to limit the probe head 202 from further slipping in when sliding upwards along the guide channel.
In addition, the impact force of the probe 2 inserted into the soil layer is applied by the drop hammer 4, so that the drop hammer 4 can apply the impact force along the axial direction of the probe 2, a traction rope 5 can be connected to the top of the probe cap 203, a through hole is formed in the middle of the drop hammer 4, the traction rope 5 penetrates through the drop hammer 4 with the hole when the drop hammer is used, then the drop hammer 4 is kept at the hole top of the bored pile and releases the drop hammer 4, the drop hammer 4 falls onto the probe cap 203 along the traction rope 5, and the probe 2 can penetrate through the base 1 and be inserted into the soil layer downwards in the process.
The magnetic ring 3 is used for recording the depth of the probe 2 inserted into the soil layer, the magnetic ring 3 is made of ferromagnetic materials, the magnetic ring 3 can be sleeved on the probe guide rod 201 extending out of the top of the guide rail 103, and the outer diameter of the magnetic ring 3 is larger than the diameter of a hollow pore passage of the guide rail 103, so that the magnetic ring 3 cannot enter the pore passage in the guide rail 103. The magnetic ring 3 can be kept relatively fixed with the probe guide rod 201 through magnetic attraction in a state of not receiving external force except gravity.
The method for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile by using the device is described in detail below, and comprises the following steps:
s1: lowering base 1 and probe 2: preparing a section of hauling rope 5 with the length larger than the length according to the length of the bored pile, wherein one end of the hauling rope 5 is fixed on the probe cap 203, the other end of the hauling rope 5 is fixed on a support of a bored pile orifice, the base 1 can fall to the bottom of the probe 2 under the action of gravity, and then the magnetic ring 3 is pushed by hand to align with the top of the base 1, and the step can also be called as data zeroing of the measuring device; then slowly lowering the base 1 and the probe 2 to the position above the pile bottom sediment 6 of the drilled pile, and always keeping the drop hammer 4 positioned at the hole top of the drilled pile in the lowering process;
s2: releasing the drop weight 4: when the drop hammer 4 is lowered to the bottom of the hole and the traction rope 5 is kept in a slightly tensioned state, the traction rope 5 is adjusted to be in the plumb direction, the drop hammer 4 is released, the drop hammer 4 falls to the bottom of the hole along the traction rope 5 and impacts the probe cap 203, the probe 2 pierces downwards under the impact force of the drop hammer 4, the probe 202 penetrates through the soft pile bottom sediment 6 and then reaches the bearing soil layer 7 of the compact pile end to stop, and at the moment, the magnetic ring 3 is pushed upwards to a certain position due to the relative sliding between the base 1 and the probe 2;
s3: recover drop 4 and read: the pulling rope 5 is pulled upwards, then the base 1 falls to the bottom of the probe 2 under the action of gravity, the magnetic ring 3 is firmly absorbed on the probe 2, the pulling rope 5 is recovered to the ground, and at the moment, the corresponding reading at the bottom of the magnetic ring 3 is the thickness of the pile bottom sediment.
In the device, the specific material selection and the size parameters of each part can be adjusted according to actual conditions. The preferred mode provided by the utility model is as follows:
non-ferromagnetic material is chooseed for use to the base material, and for one of them kind of aluminium, copper and stainless steel, avoid on the one hand to lead to rustting in the time soaking time overlength in aqueous, on the other hand guarantees that the magnetic ring does not produce magnetic attraction with the base when sliding on the probe rod, and the bottom plate diameter of base is 15 ~ 20cm, and thickness is 3 ~ 6mm, and the guide rail length of base is 6 ~ 10 cm.
The magnetic ring is made of high-density magnetic materials, so that sufficient magnetic attraction force is guaranteed between the magnetic ring and the probe guide rod, the magnetic ring can be firmly attracted to the probe guide rod in the probe lifting process, and the height of the magnetic ring is 10-20 mm.
The drop hammer is made of stainless and high-density materials, stainless steel or copper, the weight of the drop hammer is controlled to be 500-1000 g, and the drop hammer is in one of a spherical shape, a cylindrical shape and a spindle shape.
The diameter of the probe guide rod is 8-15 mm, the length of the probe guide rod is 300mm, scale marks are arranged on the probe guide rod, a sediment thickness value can be conveniently read after the probe is lifted, the diameter of the end part of a probe head of the probe is 2mm larger than that of the probe guide rod, and the diameter of a probe cap of the probe is 30-50 mm.
The probe is a replaceable probe, when the holding soil layer is a hard soil layer such as bedrock or gravel layer, a conical probe can be selected, and when the holding soil layer is a non-hard soil layer such as clay or silt layer, a round probe can be selected, so that the accuracy of measurement is ensured.
The hauling cable is a steel wire rope with a plastic protective layer, so that the steel wire rope is prevented from rusting in use.
The specific implementation of the above-described device will be described below by means of several embodiments, the structure of the device being as described above, differing only in the dimensional parameters and materials.
Example 1:
the embodiment provides a device for measuring the thickness of sediment at the bottom of a hole of a cast-in-situ bored pile, which comprises a base 1, a probe 2, a magnetic ring 3, a drop hammer 4 and a traction rope 5, and the basic structure is shown in fig. 1 and 2. The base 1 is made of a non-ferromagnetic material, wherein the non-ferromagnetic material is one of aluminum, copper and stainless steel, the diameter of a bottom plate 102 of the base 1 is 15cm, the thickness of the bottom plate is 1mm, and the length of a guide rail 103 of the base 1 is 6 cm. The magnetic ring 3 is made of high-density magnetic materials, and the height of the magnetic ring 3 is 10 mm. The drop hammer 4 is made of stainless and high-density materials, stainless steel or copper is selected, the weight of the drop hammer 4 is controlled to be 500g, and the drop hammer 4 is in one of a spherical shape, a cylindrical shape and a spindle shape. The diameter of the probe guide rod 201 is 8mm, the length of the probe guide rod is 300mm, the probe guide rod 201 is provided with scale marks 204, the diameter of the end part of the probe 202 is 2mm larger than that of the probe guide rod 201, and the diameter of the probe cap 203 is 30 mm. The probe tip 202 is a replaceable tip. The hauling cable 5 is a steel wire rope with a plastic protective layer.
Example 2:
the embodiment provides a device for measuring the thickness of sediment at the bottom of a hole of a cast-in-situ bored pile, which comprises a base 1, a probe 2, a magnetic ring 3, a drop hammer 4 and a traction rope 5, and the basic structure is shown in fig. 1 and 2. The base 1 is made of a non-ferromagnetic material, one of aluminum, copper and stainless steel, the diameter of a bottom plate 102 of the base 1 is 17cm, the thickness of the bottom plate is 4mm, and the length of a guide rail 103 of the base 1 is 8 cm. The magnetic ring 3 is made of high-density magnetic materials, and the height of the magnetic ring 3 is 15 mm. The drop hammer 4 is made of stainless and high-density materials, stainless steel or copper is selected, the weight of the drop hammer 4 is controlled to be 700g, and the drop hammer 4 is in one of a spherical shape, a cylindrical shape and a spindle shape. The diameter of the probe guide rod 201 is 10mm, the length of the probe guide rod is 300mm, the probe guide rod 201 is provided with scale marks 204, the diameter of the end part of the probe 202 is 2mm larger than that of the probe guide rod 201, and the diameter of the probe cap 203 is 40 mm. The probe tip 202 is a replaceable tip. The hauling cable 5 is a steel wire rope with a plastic protective layer.
Example 3:
the embodiment provides a device for measuring the thickness of sediment at the bottom of a hole of a cast-in-situ bored pile, which comprises a base 1, a probe 2, a magnetic ring 3, a drop hammer 4 and a traction rope 5, and the basic structure is shown in fig. 1 and 2. The base 1 is made of a non-ferromagnetic material, one of aluminum, copper and stainless steel, the diameter of a bottom plate 102 of the base 1 is 18cm, the thickness of the bottom plate is 5mm, and the length of a guide rail 103 of the base 1 is 9 cm. The magnetic ring 3 is made of high-density magnetic materials, and the height of the magnetic ring 3 is 18 mm. The drop hammer 4 is made of stainless and high-density materials such as stainless steel or copper, the weight of the drop hammer 4 is controlled to be 850g, and the drop hammer 4 is in one of a spherical shape, a cylindrical shape and a spindle shape. The diameter of the probe guide rod 201 is 13mm, the length of the probe guide rod is 300mm, the probe guide rod 201 is provided with scale marks 204, the diameter of the end part of the probe 202 is 2mm larger than that of the probe guide rod 201, and the diameter of the probe cap 203 is 45 mm. The probe tip 202 is a replaceable tip. The hauling cable 5 is a steel wire rope with a plastic protective layer.
Example 4:
the embodiment provides a device for measuring the thickness of sediment at the bottom of a hole of a cast-in-situ bored pile, which comprises a base 1, a probe 2, a magnetic ring 3, a drop hammer 4 and a traction rope 5, and the basic structure is shown in fig. 1 and 2. The base 1 is made of non-ferromagnetic material, one of aluminum, copper and stainless steel, the diameter of the bottom plate 102 of the base 1 is 20cm, the thickness of the bottom plate is 6mm, and the length of the guide rail 103 of the base 1 is 10 cm. The magnetic ring 3 is made of high-density magnetic materials, and the height of the magnetic ring 3 is 20 mm. The drop hammer 4 is made of stainless and high-density materials, stainless steel or copper is adopted, the weight of the drop hammer 4 is controlled to be 1000g, and the drop hammer 4 is in one of a spherical shape, a cylindrical shape and a spindle shape. The diameter of the probe guide rod 201 is 15mm, the length of the probe guide rod is 300mm, the probe guide rod 201 is provided with scale marks 204, the diameter of the end part of the probe 202 is 2mm larger than that of the probe guide rod 201, and the diameter of the probe cap 203 is 50 mm. The probe tip 202 is a replaceable tip. The hauling cable 5 is a steel wire rope with a plastic protective layer.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a measure device of drilling bored concrete pile hole bottom sediment thickness which characterized in that: comprises a base (1), a probe (2), a magnetic ring (3), a drop hammer (4) and a traction rope (5); the base (1) comprises a limiting groove (101), a bottom plate (102) and a guide rail (103), the guide rail (103) is vertically fixed on the bottom plate (102), and a hollow pore passage in the guide rail (103) and a central hole of the bottom plate (102) form a guide channel penetrating through the whole base (1); the limiting groove (101) is formed in the bottom of the guide channel, so that a step surface is formed in the guide channel; the probe (2) comprises a probe guide rod (201), a probe head (202) and a probe cap (203), the probe guide rod (201) penetrates through the guide channel, the probe guide rod and the guide channel form a sliding pair limited by the inner wall of the guide rail (103), the probe head (202) and the probe cap (203) are respectively arranged at the bottom end and the top end of the probe guide rod (201), the diameter of the end part of the probe head (202) is larger than that of the probe guide rod (201), and the probe head (202) can be matched with the stepped surface to limit the probe head (202) to further slide in when sliding along the guide channel; the top of the probe cap (203) is connected with a traction rope (5), and the traction rope (5) passes through a drop hammer (4) with a hole; the probe (2) is made of ferromagnetic materials, the magnetic ring (3) is sleeved on the probe guide rod (201) extending out of the top of the guide rail (103), the outer diameter of the magnetic ring is larger than the diameter of the hollow pore passage, and the magnetic ring (3) can be kept relatively fixed with the probe guide rod (201) through magnetic attraction under the condition that the magnetic ring is free from external force except gravity.
2. The device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile according to claim 1, wherein: the base (1) is made of a non-ferromagnetic material, and is made of one of aluminum, copper and stainless steel.
3. The device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile according to claim 1, wherein: the diameter of a middle bottom plate (102) of the base (1) is 15-20 cm, the thickness of the middle bottom plate is 3-6 mm, and the length of the guide rail (103) is 6-10 cm.
4. The device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile according to claim 1, wherein: the height of the magnetic ring (3) is 10-20 mm.
5. The device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile according to claim 1, wherein: the drop hammer (4) is made of one of stainless steel or copper, and the weight of the drop hammer (4) is controlled to be 500-1000 g.
6. The device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile according to claim 1, wherein: the drop hammer (4) is one of spherical, cylindrical and spindle-shaped.
7. The device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile according to claim 1, wherein: the probe guide rod (201) is cylindrical, the diameter of the probe guide rod is 8-15 mm, the length of the probe guide rod is 300mm, the diameter of the end part of the probe (202) is 2mm larger than that of the probe guide rod (201), and the diameter of the probe cap (203) is 30-50 mm.
8. The device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile according to claim 1, wherein: and the probe guide rod (201) is provided with scale marks (204).
9. The device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile according to claim 1, wherein: the probe head (202) is connected with the probe guide rod (201) through threads, so that the probe head (202) can be replaced.
10. The device for measuring the thickness of the sediment at the bottom of the hole of the cast-in-situ bored pile according to claim 1, wherein: the hauling cable (5) is a steel wire rope with a plastic protective layer.
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| CN202121420878.2U CN215572593U (en) | 2021-06-24 | 2021-06-24 | Device for measuring thickness of sediment at bottom of cast-in-situ bored pile hole |
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| CN202121420878.2U CN215572593U (en) | 2021-06-24 | 2021-06-24 | Device for measuring thickness of sediment at bottom of cast-in-situ bored pile hole |
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