Post-grouting device with double-layer load box

Abstract

The utility model discloses a double-layer load box post-grouting device which comprises a test pile, an upper reinforcement cage, a middle reinforcement cage and a lower reinforcement cage are arranged in the test pile, an upper-layer load box is connected between the upper reinforcement cage and the middle reinforcement cage, and a lower-layer load box is connected between the middle reinforcement cage and the lower reinforcement cage. The grouting system comprises grouting equipment, a grouting pipeline, an upper grouting device and a lower grouting device, the upper grouting device is connected with the upper-layer load box, the lower grouting device is connected with the lower-layer load box, the grouting pipeline comprises a first pipe section, a second pipe section and a third pipe section which are connected through a three-way joint, and the first pipe section, the second pipe section and the third pipe section are connected through a three-way joint. The first pipe section is connected with the grouting equipment, the second pipe section is connected with the lower grouting device, the third pipe section is connected with the upper grouting device, and a check valve is arranged on the third pipe section.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of building engineering, in particular to a double -deck load box rear grouting device. BACKGROUND

[0002] Pile foundation is an important underground structure in building, and the self-balancing test pile method can utilize the internal counterforce of the pile foundation, that is, the load box is buried at the internal balance point of the pile body, the side friction of the upper pile section, the weight and the side friction of the lower pile section and the pile end resistance are balanced to load, and the bearing capacity of the pile is converted according to the test result through the conversion method.

[0003] After the self-balancing test, the load box position will be displaced due to the displacement of the upper and lower pile sections, the load box cannot be restored to the original displacement after pressure relief, and there will be a gap in the load box position, forming a broken pile state, therefore, how to handle the load box after loading is completed is an important factor to determine whether the test pile can be used as an engineering pile, and the commonly used handling method in engineering is post-grouting treatment. UTILITY MODEL CONTENTS

[0004] The utility model discloses a double -deck load box rear grouting device, to solve the problem of the existing post -grouting mode in the pile foundation construction in many grouting pipes.

[0005] A double -deck load box rear grouting device, including test pile pipe, the test pile pipe is provided with upper reinforcement cage, middle reinforcement cage and lower reinforcement cage, the upper reinforcement cage is connected with the upper layer load box between the middle reinforcement cage, and the middle reinforcement cage is connected with the lower layer load box between the lower reinforcement cage.

[0006] Grouting system, the grouting system includes grouting equipment, grouting pipeline, upper grouting device and lower grouting device, the upper grouting device is connected with the upper layer load box, the lower grouting device is connected with the lower layer load box, the grouting pipeline includes the first pipe section, the second pipe section and the third pipe section connected through the tee joint, the first pipe section is connected with the grouting equipment, the second pipe section is connected with the lower grouting device, the third pipe section is connected with the upper grouting device, and the third pipe section is provided with check valve.

[0007] Preferably, the upper load box comprises a first upper steel plate and a first lower steel plate, a jack is arranged between the first upper steel plate and the first lower steel plate, the upper grouting device is arranged on the first lower steel plate, an upper grouting pipe interface is arranged on the upper grouting device, and the upper grouting pipe interface is connected with the third pipe section.

[0008] Preferably, the upper load box further comprises an inner steel ring and an outer steel ring, a connecting plate is connected between the inner steel ring and the outer steel ring, the jack is connected to the connecting plate, the inner steel ring and the outer steel ring are connected to the first upper steel plate and the first lower steel plate, and the inner steel ring and the outer steel ring on the first upper steel plate are connected with the inner steel ring and the outer steel ring on the first lower steel plate through connecting steel bars.

[0009] Preferably, the outer steel ring on the first lower steel plate is connected with a displacement pipe and a displacement protection pipe.

[0010] Preferably, the lower load box comprises a second upper steel plate and a second lower steel plate, a jack is arranged between the second upper steel plate and the second lower steel plate, the lower grouting device is arranged on the second upper steel plate, a lower grouting pipe interface is arranged on the upper grouting device, and the lower grouting pipe interface is connected with the second pipe section.

[0011] Preferably, the lower load box further comprises an inner steel ring and an outer steel ring, a connecting plate is connected between the inner steel ring and the outer steel ring, the jack is connected to the connecting plate, the inner steel ring and the outer steel ring are connected to the second upper steel plate and the second lower steel plate, and the inner steel ring and the outer steel ring on the second upper steel plate are connected with the inner steel ring and the outer steel ring on the second lower steel plate through connecting steel bars.

[0012] Preferably, the outer steel ring on the second upper steel plate is connected with a displacement pipe and a displacement protection pipe.

[0013] Preferably, the upper grouting device and the lower grouting device each comprise a ring-shaped grouting pipe, a plurality of grouting device bodies are arranged on the ring-shaped grouting pipe, and a one-way rubber plug is arranged on each grouting device body.

[0014] Preferably, a data acquisition system is further arranged in the test pile pipe, and the data acquisition system comprises a steel bar meter, a displacement sensor, and a pressure sensor.

[0015] Compared with the existing double-layer load box, the rear grouting mode of the double-layer load box in the utility model is that the concrete slurry is firstly passed through the first pipe section and the second pipe section of the grouting pipe and is grouted into the lower load box, when the grouting of the lower load box is completed, the slurry reaches the upper load box through the third pipe section of the grouting pipe due to the pressure, the upper load box is grouted, the check valve can prevent the slurry at the position of the upper load box from flowing back, the rear grouting mode is to grout the load box from bottom to top, the grouting is carried out according to the principle of 'first bottom, then upper, first slow, then fast, and gradual pressurization in stages', the cumbersome of using the grouting pipes for the upper and lower load boxes is avoided, the influence of the grouting pipe on the pile foundation is reduced, the installation process is simplified, and the success rate of grouting is improved, the grouting from the bottom of the upper load box can make the grouting more full and the grouting effect better, and the ultimate bearing capacity of the pile foundation can be greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. In all the drawings, similar elements or parts are generally identified by similar reference signs. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0017] Figure 1 is a schematic diagram of the double-layer load box combined rear grouting device provided by the utility model;

[0018] Figure 2 is a load box plan view of the double-layer load box combined grouting provided by the utility model;

[0019] Figure 3 is a sectional view of the upper load box provided by the utility model;

[0020] Figure 4 is a sectional view of the lower load box provided by the utility model;

[0021] MAIN DRAWING MARK EXPLANATION:

[0022] 1-upper load box, 2-lower load box, 3-grouting equipment, 41-upper grouting device, 42-lower grouting device, 40-annular grouting pipe, 410-upper grouting pipe interface, 420-lower grouting pipe interface, 5-check valve, 6-grouting pipe, 61-first pipe section, 62-second pipe section, 63-third pipe section, 11-first upper steel plate, 12-first lower steel plate, 14-jack, 140-oil inlet, 17-first inner steel ring, 18-first outer steel ring, 19-first connecting plate, 20-displacement pipe, 201-displacement protection pipe, 21-second upper steel plate, 22-second lower steel plate, 7-reinforcement meter. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0024] In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inner", "outer", "inner side", "outer side" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0025] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, and above, below, within, etc. are understood as including the number. If the terms "first", "second", "third" are described, they are only for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0026] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "setting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The embodiments of the present application will be described below according to the overall structure of the present application.

[0027] Referring to Figure 1 A double-layer load box back grouting device, comprising a test pile, wherein an upper steel reinforcement cage, a middle steel reinforcement cage and a lower steel reinforcement cage are arranged in the test pile, an upper load box 1 is connected between the upper steel reinforcement cage and the middle steel reinforcement cage, and a lower load box 2 is connected between the middle steel reinforcement cage and the lower steel reinforcement cage.

[0028] The grouting system comprises a grouting device 3, a grouting pipe 6, an upper grouting device 41 and a lower grouting device 42, the upper grouting device 41 is connected with the upper load box 1, the lower grouting device 42 is connected with the lower load box 2, the grouting pipe 6 comprises a first pipe section 61, a second pipe section 62 and a third pipe section 63 connected by a tee joint, the first pipe section 61 is connected with the grouting device 3, the second pipe section 62 is connected with the lower grouting device 42, the third pipe section 63 is connected with the upper grouting device 41, and a check valve 5 is arranged on the third pipe section 63.

[0029] The first grouting pipe 4 is used for injecting concrete into the test pile pipe, so that the upper reinforcement cage, the upper load box 1, the middle reinforcement cage, the lower load box 2, the lower reinforcement cage and the concrete located in the test pile pipe jointly form a test pile, and the grouting pipe 6, the upper grouting device 41 and the lower grouting device 42 are also poured in the test pile. The upper load box 1 and the lower load box 2 are used for self-balancing test of the test pile, and the grouting pipe 6 is used for post-grouting at positions of the upper load box 1 and the lower load box 2 after the self-balancing test of the test pile.

[0030] After the test pile pipe is poured with concrete to obtain the test pile, the test pile is subjected to a double-layer load box test. In the test, the lower load box is first loaded, and the loading is stopped when the ultimate bearing capacity of the lower pile is reached. At this time, the pressure of the lower load box is closed, the upper load box is loaded, and the loading is stopped when the ultimate bearing capacity of the middle pile is reached. The lower pile and the middle pile are connected as a whole, and the loading is stopped when the upper pile is damaged. The ultimate bearing capacities of the upper, middle and lower piles are obtained respectively. At this time, the upper and lower load boxes are closed, and the pile is restored to the original position under the action of elasticity.

[0031] The above is the self-balancing test of the double-layer load box. After the self-balancing test, the upper load box 1 and the lower load box 2 are unloaded, and there is a gap at the positions of the load boxes. At this time, the grouting pipe 6 is used for post-grouting at the positions of the upper load box 1 and the lower load box 2, so that the test pile can continue to be used as an engineering pile. The grouting pipe 6 comprises a first pipe section 61, a second pipe section 62 and a third pipe section 63. The first pipe section 61 is directly connected with the grouting device 3. The tee joint is arranged above the lower load box 2 and below the upper load box 1. The second pipe section 62 is connected with the lower grouting device 42 on the lower load box 2. The third pipe section 63 is connected with the tee joint and then connected with the upper grouting device 41 on the upper load box 1.

[0032] In the post-grouting process, the concrete slurry is first injected through the first pipe section 61 and the second pipe section 62 of the grouting pipe 6 and through the second pipe section 62 and the lower grouting device 42 to the lower load box 2, and when the grouting of the lower load box 2 is completed, the slurry reaches the upper grouting device 41 of the upper load box 1 due to the pressure, and the upper load box 1 is grouted, and the check valve 5 can prevent the slurry at the position of the upper load box 1 from flowing back. The post-grouting method is to grout the load box from bottom to top, and the grouting is carried out according to the principles of "first bottom, then upper, first slow, then fast, and staged gradual pressure increase", and the broken pile generated in the self-balancing test is repaired. At the same time, when grouting, the slurry flows to the side of the pile while the load box is in position, which can greatly improve the ultimate bearing capacity of the test pile, reduce the number of pipes for post-grouting, and further reduce the number of pipelines in the test pile. The device is simple and efficient, and can be applied to post-grouting of most self-balancing tests, and the grouting is full and the effect is good.

[0033] Referring to Figure 1 , Figure 2 and Figure 3 , the upper load box 1 includes a first upper steel plate 11 and a first lower steel plate 12, a jack 14 is arranged between the first upper steel plate 11 and the first lower steel plate 13, the upper grouting device 41 is arranged on the first lower steel plate 11, an upper grouting pipe interface 410 is arranged on the upper grouting device 41, and the upper grouting pipe interface 410 is connected with the third pipe section 63.

[0034] Referring to Figure 2 and Figure 3 , wherein the upper grouting device 41 includes an annular grouting pipe 40, a plurality of grouting device bodies are arranged on the annular grouting pipe 40, each grouting device body is provided with a jet port, a one-way rubber plug is arranged on each jet port, the annular grouting pipe 40 is provided with the upper grouting pipe interface 410, the upper grouting pipe interface 410 is connected with the third pipe section 63 of the grouting pipe 6, the annular grouting pipe 40 is arranged on the first lower steel plate 11 and located outside the first lower steel plate 12, and the first upper steel plate 11 and the first lower steel plate 12 are circular steel plates.

[0035] Wherein, the jack 14 is provided with an oil inlet, the jack is operated through the oil inlet to complete the loading test of the load box, and the jet port of the upper grouting device 41 is used to spray concrete slurry. For the upper load box 1, the upper grouting device 41 is arranged at the position of the first lower steel plate 12 and located outside the first lower steel plate 12.

[0036] Referring to Figure 1 , Figure 2 and Figure 3The upper load box 1 further comprises a first inner steel ring 17 and a first outer steel ring 18, and a first connecting plate 19 is connected between the first inner steel ring 17 and the first outer steel ring 18, the jack 14 is connected to the first connecting plate 19, the first inner steel ring 17 and the first outer steel ring 18 are connected to the first upper steel plate 11 and the first lower steel plate 12, and the first inner steel ring 17 and the first outer steel ring 18 on the first upper steel plate 11 are connected to the first inner steel ring 17 and the first outer steel ring 18 on the first lower steel plate 12 through connecting steel bars.

[0037] The first inner steel ring 17 and the first outer steel ring 18 are connected to the first upper steel plate 11 of the upper load box 1, and the first outer steel ring 18 is arranged outside the first inner steel ring 17, and the first inner steel ring 17 and the first outer steel ring 18 are connected to the first lower steel plate 12, and the first outer steel ring 18 on the first lower steel plate 12 is arranged outside the first inner steel ring 17.

[0038] Referring to Figure 2 The first outer steel ring 18 on the first lower steel plate 11 is connected with a displacement pipe 20 and a displacement protection pipe 201.

[0039] Referring to Figure 1 , Figure 2 and Figure 4 The lower load box 2 comprises a second upper steel plate 21 and a second lower steel plate 22, and a jack 14 is arranged between the second upper steel plate 21 and the second lower steel plate 22, the lower grouting device 42 is arranged on the second upper steel plate 21, the upper grouting device 41 is provided with a lower grouting pipe interface 420, and the lower grouting pipe interface 420 is connected with the second pipe section 62.

[0040] Referring to Figure 2 and Figure 3 The lower grouting device 42 comprises an annular grouting pipe 40, a plurality of grouting device bodies are arranged on the annular grouting pipe 40, a one-way rubber plug is arranged on each grouting device body, a lower grouting pipe interface is arranged on the annular grouting pipe, the lower grouting pipe interface is connected with a third pipe section of a grouting pipe, and the annular grouting pipe 40 is arranged on the second upper steel plate 21 and located outside the second upper steel plate 21.

[0041] Referring to Figure 1 , Figure 2 and Figure 4The lower load box 2 further comprises a second inner steel ring and a second outer steel ring, and a second connecting plate is connected between the second inner steel ring and the second outer steel ring, and the jack 14 of the lower load box 2 is connected to the second connecting plate, and the second inner steel ring and the second outer steel ring are connected to the second upper steel plate 21 and the second lower steel plate 22, and the second inner steel ring and the second outer steel ring on the second upper steel plate 21 are connected to the second inner steel ring and the second outer steel ring on the second lower steel plate 22 through connecting steel bars.

[0042] Referring to Figure 1 , Figure 2 and Figure 4 , the second outer steel ring on the second upper steel plate 21 is connected to a displacement tube and a displacement protection tube. The connection relationship between the steel rings, jacks, connecting plates and steel plates in the lower load box 2 is consistent with the connection relationship between the steel rings, jacks, connecting plates and steel plates in the structure of the upper load box 1.

[0043] Referring to Figure 1 Figure 2 , the test pile is further provided with a data acquisition system, and the data acquisition system comprises a steel bar meter 7, a displacement sensor and a pressure sensor. The data acquisition system is used for data acquisition during the test process.

[0044] The embodiment also provides a method for post-grouting, and the post-grouting device is used in the specific implementation process. In the specific implementation process, a specially designed load box for double-layer load box grouting is installed in the steel reinforcement cage in advance, the binding and fixing of the grouting pipe are performed on the inner side of the steel reinforcement cage, and the load box and the grouting pipe are firmly connected by a street. The grouting pipe is connected to the upper part of the lower load box from the pressure grouting equipment, a tee joint is arranged between the upper and lower load boxes, the two ends of the tee joint are connected to the lower load box and the upper load box respectively, the upper grouting pipe is connected to the bottom of the upper load box, grouting is performed from the bottom to the top, a check valve is arranged near the joint to prevent the backflow of the grouting liquid of the upper load box, and then concrete is poured to complete the test pile and the double-layer load box test.

[0045] After the completion of the double-layer load box test, before the post-grouting, check whether the grouting pipe is unobstructed, water is passed into the grouting pipe, whether there is leakage, the pipe is unobstructed, the rubber plug can be normally opened, and the pressure is normal. After everything is normal, connect the grouting equipment to the grouting pipe, prepare the cement slurry according to the design water-cement ratio, set the grouting pressure, and perform grouting according to the principle of "first bottom, then up, first slow, then fast, and gradual pressure increase in stages". Monitor the grouting pressure, generally controlled between 0.5MP-2.0MPa, to avoid slurry escaping along the pile body cracks. Open the grouting instrument, so that the slurry reaches the lower load box first. The lower load box is connected to the grouting pipe from the upper part, and the slurry reaches the grouting pipe inside the load box, which is uniformly sprayed from the grouting device due to the pressure. After the lower load box is filled with slurry, the slurry reaches the upper load box due to the pressure, and the slurry is sprayed from the bottom of the upper load box, filling the upper load box from bottom to top. Adjust the grouting amount according to the slurry absorption amount, pressure change and other parameters to avoid excess or deficiency. After reaching the reference grouting amount, the grouting can be stopped.

[0046] After grouting is completed, the slurry is cured and maintained for 24-48 hours to ensure that the slurry is fully solidified. During this period, the settlement of the ground and surrounding structure is checked regularly to ensure safety.

[0047] In summary, the load box used in the post-grouting device is a standard load box designed uniformly, and the grouting pipe is installed on the load box, without the need for separate design and installation of the grouting pipe. It can be applied to most engineering test scenarios, and the standardized design can reduce production costs and improve the success rate of grouting. The use of interconnected grouting pipes in the upper and lower load box grouting process avoids the complexity of using separate grouting pipes for the upper and lower load boxes, reduces the impact of the grouting pipe on the pile foundation, simplifies the installation process, and improves the success rate of grouting. Grouting from the bottom of the upper load box can make the grouting more full and the grouting effect better, which can greatly improve the ultimate bearing capacity of the pile foundation.

[0048] The foregoing description of the specific exemplary embodiments of the present application is for the purpose of illustrating and describing, rather than limiting the application, and it will be apparent to those of ordinary skill in the art that many changes and modifications can be made to the embodiments with the foregoing teaching, notwithstanding what can be suggested above and although only a few of the exemplary embodiments of the present application have been described. Although the embodiments of the present application have been described, the specific embodiments are merely illustrative of the present application and are not intended to limit the present application, and the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner, and the exemplary embodiments are selected and described for the purpose of explaining the specific principles of the present application and its practical application, so that those skilled in the art can make modifications, replacements, variations and various different selections and changes to the embodiments without creative contribution after reading the specification, as long as they are within the scope of the claims of the present application.

Claims

1. A double-layer load box post-grouting device comprising a test pile, characterized in that, The test pile is internally provided with an upper steel reinforcement cage, a middle steel reinforcement cage and a lower steel reinforcement cage, an upper load box is connected between the upper steel reinforcement cage and the middle steel reinforcement cage, and a lower load box is connected between the middle steel reinforcement cage and the lower steel reinforcement cage. A grouting system comprises a grouting device, a grouting pipeline, an upper grouting device and a lower grouting device, the upper grouting device is connected with the upper load box, the lower grouting device is connected with the lower load box, the grouting pipeline comprises a first pipe section, a second pipe section and a third pipe section connected by a tee joint, the first pipe section is connected with the grouting device, the second pipe section is connected with the lower grouting device, the third pipe section is connected with the upper grouting device, and a check valve is arranged on the third pipe section.

2. The double-layer load box post-grouting device according to claim 1, characterized in that, The upper load box comprises a first upper steel plate and a first lower steel plate, a jack is arranged between the first upper steel plate and the first lower steel plate, the upper grouting device is arranged on the first lower steel plate, an upper grouting pipe interface is arranged on the upper grouting device, and the upper grouting pipe interface is connected with the third pipe section.

3. The double-layer load box post-grouting device according to claim 2, characterized in that, The upper load box further comprises an inner steel ring and an outer steel ring, a connecting plate is connected between the inner steel ring and the outer steel ring, the jack is connected to the connecting plate, the inner steel ring and the outer steel ring are connected to the first upper steel plate and the first lower steel plate, and the inner steel ring and the outer steel ring on the first upper steel plate are connected with the inner steel ring and the outer steel ring on the first lower steel plate through connecting steel bars.

4. The double-layer load box post-grouting device according to claim 3, characterized in that, The outer steel ring on the first lower steel plate is connected with a displacement pipe and a displacement protection pipe.

5. The double-layer load box post-grouting device according to claim 1, characterized in that, The lower load box comprises a second upper steel plate and a second lower steel plate, a jack is arranged between the second upper steel plate and the second lower steel plate, the lower grouting device is arranged on the second upper steel plate, a lower grouting pipe interface is arranged on the upper grouting device, and the lower grouting pipe interface is connected with the second pipe section.

6. The double-layer load box post-grouting device according to claim 5, characterized in that, The lower load box further comprises an inner steel ring and an outer steel ring, a connecting plate is connected between the inner steel ring and the outer steel ring, the jack is connected to the connecting plate, the inner steel ring and the outer steel ring are connected to the second upper steel plate and the second lower steel plate, and the inner steel ring and the outer steel ring on the second upper steel plate are connected with the inner steel ring and the outer steel ring on the second lower steel plate through connecting steel bars.

7. The double-layer load box post-grouting device according to claim 6, characterized in that, The outer steel ring on the second upper steel plate is connected with a displacement pipe and a displacement protection pipe.

8. The dual-layer load box post-grouting device according to claim 1, characterized in that, The upper grouting device and the lower grouting device each comprise an annular grouting pipe, a plurality of grouting device bodies are arranged on the annular grouting pipe, and a one-way rubber plug is arranged on each grouting device body.

9. The double-layer load box post-grouting device according to claim 1, characterized in that, The test pile is further provided with a data acquisition system, and the data acquisition system comprises a steel bar meter, a displacement sensor and a pressure sensor.

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