CN212275421U - Concrete mixture hardness determination instrument for slip form construction - Google Patents
Concrete mixture hardness determination instrument for slip form construction Download PDFInfo
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- CN212275421U CN212275421U CN202021292830.3U CN202021292830U CN212275421U CN 212275421 U CN212275421 U CN 212275421U CN 202021292830 U CN202021292830 U CN 202021292830U CN 212275421 U CN212275421 U CN 212275421U
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Abstract
The utility model discloses a slip form construction concrete mixture hardness determination instrument, which comprises a base and a static pressure rod, wherein the lower part of the base is provided with a hole extending to the lower end surface, and the upper part of the base is provided with a through hole for the static pressure rod to pass through; the static pressure rod penetrates through the through hole and the hole; the static pressure rod in the hole is connected with an adjusting nut plate with the position capable of being adjusted up and down, and a prepressing spring is sleeved on the static pressure rod between the adjusting nut plate and the top of the hole; a groove is formed in the part, extending out of the through hole, of the upper part of the static pressure rod along the circumferential direction; the clamping tenon is inserted into the groove of the static pressure rod in an inserting and pulling way; when the tenon is clamped in the groove of the static pressure rod, the lower end face of the static pressure rod and the lower end face of the base are on the same plane. The utility model discloses a measure the degree of depth in concrete hydrostatic pressure hole and look for the hardness of current concrete with concrete intensity, concrete deformation and static pressure parameter contrast table, can avoid leading to influencing the appearance quality of skidding lift efficiency and concrete panel because of personnel experience is not enough.
Description
Technical Field
The utility model relates to a hardness detection device of concrete, concretely relates to slip form construction concrete mixture hardness judges appearance.
Background
And (3) slip form construction: the slip form is also called a sliding formwork, and is a general name of a construction method of a cast-in-place concrete structure which takes a slip form jack, an electric hoist and the like as lifting power and drives a formwork (or a sliding frame) to slide along the surface of concrete (or the formwork) for molding.
The method has the advantages that 1, the sliding mould is not provided with a horizontal construction joint, the construction continuity is good, the construction process is a 'soft demoulding' construction process, the number of times of construction joint treatment in the process is few, and the work load of roughening and washing the construction joint is greatly reduced. 2. The construction progress is fast, the daily average sliding progress is about 2-4m, the daily average progress of other process construction is 1-2m, the construction progress is greatly accelerated, and the construction period is shortened by 2-3 times. 3. The slip form is of a closed structure type, the slip form is fixed by adopting a climbing rod and a hydraulic jack, after the working plate is formed, the working surface is wide, auxiliary materials are consumed less, and materials such as the pull rod, the base plate and the temporary embedded part are all saved. 4. The concrete surface flatness is high, the workload of concrete surface treatment is small, and the treatment can be carried out in time. 5. The slip form construction operation is carried out on fixed, confined work dish, and the in-process only upwards wholly climbs, and the operation workman all operates on work platform, and the security is high, and in-process template and work platform do not all carry out the dismouting, and the safe risk is little. 6. The construction period is short, and the mounting and dismounting time of the template is shortened; a winch is adopted to vertically lift in the concrete pouring process, so that the transportation time is shortened; the auxiliary construction time in the whole construction process is greatly shortened, and the pier column forming speed is accelerated. 7. The cost is relatively low, the investment of the template is low, concrete conveying pump machines and tools are saved, various auxiliary materials are saved, the influence of weather is small, and construction can be carried out at night and in rainy days; the construction period is shortened, and the management cost is reduced.
The defect is that 1, the overall appearance quality is poor. The slip form is a 'soft demoulding' process, and the surface finish of concrete is poor. 2. The slip form construction needs parallel construction in the aspects of processes of reinforcing steel bar manufacturing and installation, concrete pouring, template sliding lifting and the like, the requirements of the construction quality and the progress on the aspects of early strength of concrete, the quality of operators, construction machines, mixing and transporting capacity of concrete, a standby power supply and the like are high, special machines and tools need to be configured, personnel need to be matched on site for 24 hours, and the parallel input amount is concentrated. 3. The slip form construction is suitable for pier shapes with equal sections and two short surfaces, and can not be implemented for four-surface shrinkage and cylindrical piers.
Concrete is one of the most important civil engineering materials of the present generation. The artificial stone is prepared by a cementing material, granular aggregate (also called aggregate), water, an additive and an admixture which are added if necessary according to a certain proportion, and is formed by uniformly stirring, compacting, forming, curing and hardening. The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. These characteristics make it very widely used, not only in various civil engineering, that is shipbuilding, machinery industry, ocean development, geothermal engineering, etc., but also concrete is an important material. The strength is the most important mechanical property of the hardened concrete, and refers to the capability of the concrete to resist stress such as compression, tension, bending, shearing and the like. The water cement ratio, the variety and the dosage of cement, the variety and the dosage of aggregate, stirring, forming and curing all directly influence the strength of concrete. The concrete is divided into 19 grades according to standard compressive strength (the cubic compressive strength which is measured by a standard test method and has 95% guarantee rate by taking a cube with the side length of 150mm as a standard test piece and curing for 28 days under standard curing conditions) called as a mark, wherein the grades are divided into C10, C15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75, C80, C85, C90, C95 and C100. The tensile strength of the concrete is only 1/10-1/20 of the compressive strength of the concrete. The improvement of the ratio of tensile strength to compressive strength of concrete is an important aspect of concrete modification.
However, in the building structure, the hardness of the concrete is particularly important, and the firmness of the building structure can be ensured only by ensuring the hardness of the concrete, so that the service life of the building structure is prolonged. Therefore, the hardness of the concrete needs to be tested before the concrete is used. When rock-fill dam panel and shaft concrete construction, adopt the slip form construction usually, because the slip form construction has stronger requirement to the early hardness of concrete, after concrete is put in storage and is vibrated closely, concrete mixture hardness reaches to what degree can promote or when promote, all rely on technical staff's experience to judge, press concrete mixture surface by technical staff usually with the finger, press the pit that produces according to the finger and combine whether the hardness of concrete mixture accords with the slip form condition in the past experience. When the experience of technical personnel is insufficient, whether the hardness of the concrete mixture meets the requirements of the slip form or not can not be accurately judged, so that the sliding efficiency and the appearance quality of the concrete panel are influenced. The concrete mixture belongs to the plastic state before the initial set, can't use concrete strength monitoring instruments such as resiliometer to measure, consequently need equipment or instrument that can the rapid judgement concrete mixture hardness in the slip form construction urgently.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a slip form construction concrete mixture hardness judges appearance for judge the hardness before concrete mixture initial set, thereby improve slip form efficiency of construction.
For solving the technical problem, the utility model discloses the technical scheme who adopts does: a concrete mixture hardness judging instrument for slip form construction comprises a base and a static pressure rod, wherein the lower part of the base is provided with a hole extending to the end surface of the lower part, the upper part of the base is provided with a through hole for the static pressure rod to pass through, and the through hole is communicated with the hole and is coaxially arranged; the static pressure rod penetrates through the through hole and the hole; the static pressure rod in the hole is connected with an adjusting nut plate with the position capable of being adjusted up and down, and a prepressing spring is sleeved on the static pressure rod between the adjusting nut plate and the top of the hole; a groove is formed in the part, extending out of the through hole, of the upper part of the static pressure rod along the circumferential direction; the clamping tenon is inserted into the groove of the static pressure rod in an inserting and pulling way; when the tenon is clamped in the groove of the static pressure rod, the lower end face of the static pressure rod and the lower end face of the base are on the same plane.
As a further technical solution of the above solution, the base includes a lower base and an upper base, the upper base is detachably connected to an upper portion of the lower base; the lower part of the upper base is provided with a hole extending to the end surface of the lower part, and the upper part of the upper base is provided with a through hole for the static pressure rod to pass through; holes extending to the end face are formed in the upper portion and the lower portion of the lower base, a guide plate is arranged between the upper portion hole and the lower portion hole, and a through hole for the static pressure rod to penetrate through is formed in the guide plate; the adjusting nut plate and the pre-pressing spring are positioned in a pore channel formed by a hole in the upper part of the lower base and a hole in the lower part of the upper base.
As a further technical solution of the above solution, the static pressure lever includes a static pressure upper lever and a static pressure lower lever, the static pressure upper lever is detachably connected to an upper portion of the static pressure lower lever; the static pressure upper rod penetrates through the upper base, the groove is formed in the static pressure upper rod, and the static pressure lower rod penetrates through the lower base; and the outer surface of the lower part of the static pressure upper rod or the outer surface of the upper part of the static pressure lower rod is provided with an external thread and is connected with the adjusting nut plate.
As a further technical solution of the above solution, the latch is rotatably connected to the top surface of the base.
As a further technical scheme of the above scheme, the device further comprises a limit bolt, wherein the limit bolt is connected in a threaded hole preset on the top surface of the base; the clamping tenon is arc-shaped; one end of the clamping tenon is rotatably connected with the limiting bolt.
As a further technical scheme of the scheme, the device further comprises a return spring, one end of the return spring is fixedly connected, and the other end of the return spring is connected with one side, away from the static pressure rod, of the clamping tenon.
As a further technical scheme of the above scheme, the part of the upper part of the static pressure rod, which extends out of the through hole of the base, is provided with scales; and a pointer pointing to the scale is fixed on the base.
As a further technical scheme of the scheme, the bottom of the base horizontally extends to the periphery to form a bottom plate.
As a further technical scheme of the scheme, the lower end face of the static pressure rod is connected with a spherical static pressure head.
As a further technical scheme of the scheme, the top of the static pressure lever is connected with a pull ring.
Compared with the prior art, the utility model, following advantage and beneficial effect have: the elastic force of the pre-pressing spring is adjusted by utilizing the adjusting nut plate, so that the elastic force of the pre-pressing spring meets the hardness test requirement of the concrete mixture; pressing the pre-pressing spring and the static pressure rod in place, and locking the position of the static pressure rod by using a tenon; the utility model is placed on the surface of the tested concrete mixture, the tenon is released, and after the static pressure of the static pressure rod is stabilized, the descending height of the static pressure rod or the depth of the static pressure pit is measured; then draw into the hardness look-up table as the reference in combination with the depth of the concrete mixture static pressure pit, the intensity of the concrete, the concrete deformation, the static pressure parameter, when subsequently using the utility model discloses carry out the hardness judgement, survey the descending height of static pressure pole, or behind the depth of static pressure pit, look up above-mentioned hardness look-up table in contrast, can learn the hardness of the concrete mixture that awaits measuring; through the utility model discloses can avoid leading to influencing the appearance quality of smooth lift efficiency and concrete panel because personnel experience is not enough.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic top view of the present invention.
Fig. 3 is a sectional view in the direction B-B in fig. 2.
Fig. 4 is a sectional view in the direction of a-a in fig. 2.
Fig. 5 is a sectional view in the direction of C-C in fig. 3.
Fig. 6 is a schematic structural view of the upper static pressure upper rod of the present invention.
Fig. 7 is a schematic structural view of the upper static pressure lower rod of the present invention.
The explanation of each reference number in the figure is: the device comprises a base plate 1, a lower base 2, an upper base 3, a locking bolt 4, a top cover 5, a connecting bolt 6, a limiting bolt 7, a handle 8, a static pressure upper rod 9, a pointer 10, a locking bolt 11, a tenon 12, a pre-pressing spring 13, an adjusting nut plate 14, a static pressure lower rod 15 and a reset spring 16.
Detailed Description
The following detailed description of the present invention will be provided in order to further understand the concept of the present invention, the technical problems, the technical features constituting the technical solutions, and the technical effects brought by the technical features of the present invention, which are described in the following with reference to the accompanying drawings. However, the description of the embodiments is illustrative and not intended to limit the present invention.
Whether satisfy slip form lifting condition for can in time judge at slip form concrete placement in-process, the utility model discloses characteristic before according to concrete mixture initial set has designed a concrete mixture hardness and has judged the appearance, and the leading principle is concrete when area of contact is a timing, and its plastic deformation when receiving external force is linear relation with the power of exerting.
The judging instrument comprises a base and a static pressure rod, wherein the lower part of the base is provided with a hole extending to the end surface of the lower part, the upper part of the base is provided with a through hole for the static pressure rod to pass through, and the through hole is communicated with the hole and coaxially arranged; the static pressure rod passes through the through hole and the hole. The static pressure rod in the hole is connected with an adjusting nut plate 14 with the position capable of being adjusted up and down, and a pre-pressing spring 13 is sleeved on the static pressure rod between the adjusting nut plate 14 and the top of the hole. A groove is formed in the part, extending out of the through hole, of the upper part of the static pressure rod along the circumferential direction; the clamping tenon 12 is clamped in the groove of the static pressure lever in an inserting and pulling way; when the tenon 12 is clamped in the groove of the static pressure lever, the lower end face of the static pressure lever and the lower end face of the base are in the same plane.
Because the utility model adopts the pre-pressing spring 13 to provide elasticity, the elasticity of the pre-pressing spring 13 has certain requirements, if the elasticity of the pre-pressing spring 13 is too small, a pit can not be extruded on the surface of the concrete mixture, and thus the hardness detection can not be completed; if the elasticity of pre-compaction spring 13 is too big, will extrude very dark pit in concrete mixture's surface, cause concrete mixture to cave in, extrude bad concrete mixture even, lead to the measuring result inaccurate. Meanwhile, concrete mixtures with different mixing ratios have different hardness requirements according with slip form conditions, and the hardness of the concrete mixtures needs to be accurately measured by correspondingly adjusting the elastic force of the pre-pressing spring 13. Therefore, the utility model discloses the equipment back that finishes, intensity (generally being 0.5 MP) that has when looking into concrete mixture initial set according to job site's air humidity, temperature isoparametric before the use, according to the position of its numerical value adjustment adjusting nut dish 14, adjust the elasticity of pre-compaction spring 13 to suitable scope. Draw the position of static depression bar locking in the recess of static depression bar to the trip 12 card income, will assemble and finish the utility model discloses a lower part terminal surface of base and the surface of the concrete mixture of preparing the test fully contact, at this moment, the lower part terminal surface of static pressure pole also just with the surface contact of concrete mixture. After the inspection is finished, the tenon 12 is pulled out, and the static pressure rod statically presses the surface of the concrete mixture to be tested under the action of the elastic force of the pre-pressing spring 13. And measuring the descending height of the static pressure rod or the depth of the static pressure pit, and recording the height or the depth into a table. Meanwhile, technicians press the surface of the concrete mixture by fingers, judge whether the hardness of the concrete mixture meets the requirement according to experience, and record the depth of the pits pressed by the fingers into a table. Through the contrast the utility model discloses a record data that record data and technician's finger pressed combines the degree of depth, the intensity of concrete, concrete deformation, the static pressure parameter in concrete mixture static pressure hole to draw into the hardness contrast table as the reference, follow-up use the utility model discloses when carrying out the hardness judgement, survey the descending height of static pressure pole, or behind the degree of depth in static pressure hole, contrast the above-mentioned hardness contrast table of inquiry, can learn the hardness of the concrete mixture that awaits measuring.
The base includes base 2 and last base 3 down, and the upper portion of base 2 is equipped with the external screw thread down, and the lower part of going up base 3 is equipped with the internal thread, goes up base 3 and base 2 down and passes through screw thread detachably and connect. The lower part of the upper base 3 is provided with a hole extending to the end surface of the lower part, and the upper part of the upper base 3 is provided with a through hole for the static pressure rod to pass through. The upper portion and the lower part of lower base 2 all set up the hole that extends to the terminal surface, have the deflector between upper portion hole and the lower part hole, set up the through-hole that supplies the static pressure pole to pass on the deflector. The adjusting nut plate 14 and the pre-pressing spring 13 are positioned in a pore channel formed by a hole at the upper part of the lower base 2 and a hole at the lower part of the upper base 3. Because the perpendicularity between the static pressure rod and the surface of the concrete mixture to be measured is higher, the measurement precision is higher, and therefore through holes for the static pressure rod to pass through are formed in the upper base 3 and the lower base 2 respectively, the upper portion and the lower portion of the static pressure rod can be limited simultaneously, the static pressure rod cannot shake or shift in the up-and-down movement process, and the perpendicularity between the static pressure rod and the surface of the concrete mixture to be measured can be guaranteed. The bottom of lower base 2 extends away to level all around and forms bottom plate 1, and bottom plate 1 makes the utility model discloses with the area of contact grow on the surface of the concrete mixture that awaits measuring, more do benefit to the straightness that hangs down between the surface of guaranteeing static pressure pole and the concrete mixture that awaits measuring.
The static pressure rod comprises a static pressure upper rod 9 and a static pressure lower rod 15, an internal thread hole is processed at the bottom of the static pressure upper rod 9, a thread column is arranged at the upper part of the static pressure lower rod 15, and the static pressure upper rod 9 and the static pressure lower rod 15 are detachably connected through threads. The static pressure upper rod 9 penetrates through the upper base 3, the groove is formed in the static pressure upper rod 9, and the static pressure lower rod 15 penetrates through the lower base 2. The outer surface of the lower part of the static upper rod 9 or the outer surface of the upper part of the static lower rod 15 is provided with an external thread and is connected with the adjusting nut plate 14. The static pressure rod is split into the static pressure upper rod 9 and the static pressure lower rod 15, and the whole device is assembled conveniently. And the height of the adjusting nut plate 14 can be adjusted at will according to the requirement by adjusting the adjusting nut plate 14 by using the screw thread, so that the elastic force of the pre-pressing spring 13 can be adjusted to a proper range. The lower end face of the static pressure lower rod 15 is connected with a spherical static pressure head, the spherical static pressure head can simulate the pressing effect of the end face of a finger, so that the contact with a concrete mixture is more natural, and the behavior of pressing the concrete mixture by the finger is more similar to that of a technician, so that the technician can conveniently judge the concrete mixture by comparing the past experience; meanwhile, the spherical static pressure head is more beneficial to the extrusion of concrete mixtures, the stress is more uniform, and the measurement precision can be improved. The diameter of the spherical static head may be smaller than, equal to, or larger than the diameter of the static pressure lower bar 15. The top of the static pressure upper rod 9 is connected with a pull ring, and the pull ring is convenient for pulling the whole static pressure rod.
The latch 12 may be used alone or hinged to the top surface of the upper base 3. The clamping tenon is connected to a threaded hole preset in the top surface of the upper base 3 through a limiting bolt 7, one end of the clamping tenon 12 is rotatably connected with the limiting bolt 7, and the clamping tenon 12 can be prevented from being lost due to independent use. The tenon 12 can be in a long strip shape, preferably in an arc shape, and an arc-shaped gap of the tenon is just clamped in a groove of the static pressure rod, so that the occupied space of the tenon 12 on the top surface of the upper base 3 can be reduced.
The static pressure bar is characterized by further comprising a return spring 16, one end of the return spring 16 is fixedly connected to the top surface of the upper base 3, and the other end of the return spring 16 is connected with one side, away from the static pressure bar, of the tenon 12. The return spring 16 provides a return force to the latch 12 so that the latch 12 is more easily latched into the recess of the stationary platen. A top cover 5 can be connected to the top of the upper base 3 through a connecting bolt 6, the top cover 5 is provided with a cavity for accommodating the trip 12 and the return spring 16, and the fixed end of the return spring 16 can be connected to the inner wall of the cavity of the top cover 5.
The part of the upper part of the static upper rod 9 extending out of the through hole of the base is provided with scales; and a pointer 10 pointing to the scale is fixed on the upper base 3. Or the pointer 10 is fixed on the top of the top cover 5 by a locking bolt 11.
A handle 8 is hinged on the upper part of the upper base 3 through a locking bolt 4 so as to be convenient for taking and carrying the whole instrument.
Use the utility model discloses can eliminate concrete mixture hardness effectively and judge the inaccurate defect that relies on constructor's experience and lead to completely, whether the hardness that concrete mixture can be accurately judged to this instrument high-efficiently satisfies the slipform lifting conditions, can greatly improve slipform efficiency of construction, reduce because of concrete mixture hardness judges the circumstances such as the slipform come-up or appearance quality difference that inaccurate and cause, have very strong practicality, can show increase economic benefits.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a slip form construction concrete mixture hardness judges appearance which characterized in that: the static pressure rod fixing device comprises a base and a static pressure rod, wherein the lower part of the base is provided with a hole extending to the end surface of the lower part, the upper part of the base is provided with a through hole for the static pressure rod to pass through, and the through hole is communicated with the hole and coaxially arranged; the static pressure rod penetrates through the through hole and the hole; the static pressure rod in the hole is connected with an adjusting nut plate (14) with the position capable of being adjusted up and down, and a pre-pressing spring (13) is sleeved on the static pressure rod between the adjusting nut plate (14) and the top of the hole; a groove is formed in the part, extending out of the through hole, of the upper part of the static pressure rod along the circumferential direction; the clamping device also comprises a clamping tenon (12), wherein the clamping tenon (12) can be clamped into the groove of the static pressure lever in an inserting and pulling manner; when the tenon (12) is clamped in the groove of the static pressure lever, the lower end face of the static pressure lever and the lower end face of the base are in the same plane.
2. The slipform construction concrete mixture hardness determinator of claim 1, characterized in that: the base comprises a lower base (2) and an upper base (3), and the upper base (3) is detachably connected to the upper part of the lower base (2); the lower part of the upper base (3) is provided with a hole extending to the end surface of the lower part, and the upper part of the upper base (3) is provided with a through hole for the static pressure rod to pass through; holes extending to the end face are formed in the upper portion and the lower portion of the lower base (2), a guide plate is arranged between the upper portion hole and the lower portion hole, and a through hole for the static pressure rod to penetrate through is formed in the guide plate; the adjusting nut plate (14) and the pre-pressing spring (13) are positioned in a pore channel formed by a hole in the upper part of the lower base (2) and a hole in the lower part of the upper base (3).
3. The slipform construction concrete mixture hardness determinator of claim 2, characterized in that: the static pressure rod comprises a static pressure upper rod (9) and a static pressure lower rod (15), and the static pressure upper rod (9) is detachably connected to the upper part of the static pressure lower rod (15); the static upper rod (9) penetrates through the upper base (3), the groove is formed in the static upper rod (9), and the static lower rod (15) penetrates through the lower base (2); and the outer surface of the lower part of the static pressure upper rod (9) or the outer surface of the upper part of the static pressure lower rod (15) is provided with an external thread and is connected with the adjusting nut plate (14).
4. The slipform construction concrete mixture hardness determinator of claim 1, characterized in that: the latch (12) is rotatably connected to the top surface of the base.
5. The slipform construction concrete mixture hardness determinator of claim 4, characterized in that: the device also comprises a limiting bolt (7), wherein the limiting bolt (7) is connected in a threaded hole which is preset on the top surface of the base; the clamping tenon (12) is arc-shaped; one end of the tenon (12) is rotatably connected with the limiting bolt (7).
6. The slipform construction concrete mixture hardness determinator of claim 4 or 5, characterized in that: the static pressure bar is characterized by further comprising a return spring (16), one end of the return spring (16) is fixedly connected, and the other end of the return spring (16) is connected with one side, far away from the static pressure bar, of the tenon (12).
7. The slipform construction concrete mixture hardness determinator of claim 1, characterized in that: scales are arranged on the part of the upper part of the static pressure rod, which extends out of the through hole of the base; and a pointer (10) pointing to the scale is fixed on the base.
8. The slipform construction concrete mixture hardness determinator of claim 1, characterized in that: the bottom of the base extends out to the level all around and forms bottom plate (1).
9. The slipform construction concrete mixture hardness determinator of claim 1, characterized in that: the lower end surface of the static pressure rod is connected with a spherical static pressure head.
10. The slipform construction concrete mixture hardness determinator of claim 1, characterized in that: the top of the static pressure lever is connected with a pull ring.
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| CN202021292830.3U CN212275421U (en) | 2020-07-06 | 2020-07-06 | Concrete mixture hardness determination instrument for slip form construction |
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| CN111751202A (en) * | 2020-07-06 | 2020-10-09 | 中国水利水电第五工程局有限公司 | Concrete mixture hardness determination instrument for slip form construction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111751202A (en) * | 2020-07-06 | 2020-10-09 | 中国水利水电第五工程局有限公司 | Concrete mixture hardness determination instrument for slip form construction |
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