A construction engineering cast-in-place pile foundation static load experiment device

Abstract

The utility model discloses a kind of construction engineering bored pile base static load experimental devices, including the static load detection mechanism placed in foundation pit;The static load detection mechanism includes the upper loading platform and the lower loading platform of interval arrangement, and a plurality of support deviation-preventing structures are arranged between the upper loading platform and the lower loading platform;The support deviation-preventing structure includes support steel, and further include a plurality of deviation-preventing pull rods, and the deviation-preventing pull rod is tensioned to the upper loading platform, support steel and the lower loading platform;The support steel includes the support portion of both sides arrangement, and support portion is supported between the upper loading platform and the lower loading platform, and further include the connecting portion integrally formed between support portion, and deviation-preventing pull rod is penetrated from connecting portion;Further include the hydraulic upper top structure of installation in the upper loading platform top position, and hydraulic upper top structure is used for upper top test weight block.The above structure realizes to measure the static load of bored pile with stable, safe, efficient mode.

Description

Technical Field

[0001] This utility model belongs to the field of static load testing technology for pile foundations, and particularly relates to a static load testing device for cast-in-place pile foundations in building engineering. Background Technology

[0002] During building construction, foundations require the installation of cast-in-place piles on the ground. These piles serve as the support structure for the subsequent building structure, bearing the primary pressure from the ground. Therefore, after the cast-in-place piles are installed, their bearing capacity needs to be tested.

[0003] The specific testing method is as follows: In existing technology, a steel plate is placed in a pre-excavated foundation pit. After processing, the pile head of the cast-in-place pile is kept flush with the bottom of the pit. The steel plate is then supported on the pit and on top of the pile head. A hydraulic cylinder is installed on the steel plate, with a counterweight, usually a heavy block of concrete, on top of the cylinder. The construction quality of the cast-in-place pile is evaluated by detecting the descent speed of the pile head and the foundation pit.

[0004] However, in actual operation, when the hydraulic cylinder pushes upwards, the steel plate is prone to deformation and displacement within the pit due to the offset force (the center of gravity of the counterweight is misaligned with the axis of the hydraulic cylinder, mainly because it is difficult to accurately control the overall center of gravity position of the counterweight when stacking it). This results in low accuracy of the test data. Moreover, this offset and displacement pose a very high risk to the experiment, especially in cases of severe offset, where the counterweight may collapse.

[0005] Therefore, adopting a detection device with high structural stability and high safety can not only improve detection accuracy but also improve detection safety, which is of great significance to the actual detection process. Utility Model Content

[0006] Based on the above background, the purpose of this utility model is to provide a static load test device for cast-in-place pile foundations in building engineering.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A static load testing device for cast-in-place pile foundations in building engineering includes a static load testing mechanism placed in a foundation pit; the static load testing mechanism includes an upper platform and a lower platform arranged at intervals, and a plurality of support anti-deviation structures are arranged between the upper platform and the lower platform; the support anti-deviation structure includes support steel and a plurality of anti-deviation tie rods, the anti-deviation tie rods tautly holding the upper platform, support steel and lower platform together; The supporting steel includes supporting parts on both sides, which are supported between the upper platform and the lower platform. It also includes a connecting part integrally formed between the supporting parts, and an anti-deviation tie rod passes through the connecting part. It also includes a hydraulic lifting structure installed at the top of the upper platform, which is used to lift the test weight.

[0008] Preferably, the longitudinal cross-sectional shape of the support is I-shaped.

[0009] Preferably, the anti-deviation tie rod includes a screw section, and the top of the screw section is integrally formed with a screw head;

[0010] The top of the upper platform is provided with an inner recessed groove that mates with the screw head, and the screw head is limited within the inner recessed groove.

[0011] Preferably, the hydraulic lifting structure includes a jack bracket fixedly installed at the top of the upper platform, and a jack is provided inside the jack bracket.

[0012] Preferably, the jack support includes a support base fixedly installed at the top of the upper platform, and the top of the support base is integrally formed with a support cylinder for limiting and installing the jack.

[0013] Preferably, the hydraulic lifting structure further includes an upper support steel frame structure fixedly installed at the jacking end position; The jack's jacking end is fixedly equipped with a mounting base, which can be detachably installed at the bottom of the upper support steel frame structure.

[0014] Preferably, the upper support steel frame structure includes a frame-shaped steel beam located at the center, and several protruding convex arms are integrally formed on both sides of the frame-shaped steel beam; The test weight is supported between the convex arms.

[0015] Preferably, a plurality of anti-displacement structures are installed between the outer walls of the loading platform and the downloading platform; the anti-displacement structures prevent the static load detection mechanism from moving within the pit.

[0016] Preferably, the anti-deviation structure includes steel sleeves that are welded and fixed to the outer walls of the upper platform and the lower platform, respectively; The steel sleeve is equipped with an anti-displacement steel plate, and the bottom of the anti-displacement steel plate is anchored in the foundation pit.

[0017] This utility model has the following beneficial effects: 1. A support anti-deviation structure is horizontally and parallel to the width of the upper and lower platforms, and the support anti-deviation structure includes support steel. The support steel includes support parts on both sides, which support the upper and lower platforms, and also includes a connecting part integrally formed between the support parts.

[0018] It also includes several anti-deviation tie rods (laid along the length of the connection), which tighten the upper platform, support steel and lower platform.

[0019] Therefore, in the above structure, the parallel support steels distributed left and right, along with the anti-deviation tie rods distributed front and back on each support steel, form a mesh-like reinforced tension structure, thereby tightening the upper platform, support steels, and lower platform into a unified reinforced structure. This structure increases the compressive strength of the entire static load testing mechanism and reduces defects such as misalignment and displacement.

[0020] 2. The anti-deviation structure includes steel sleeves welded and fixed to the outer walls of the upper and lower platforms respectively. An anti-deviation steel plate is installed inside the steel sleeve to limit deviation, maintaining a certain distance between the anti-deviation steel plate and the steel sleeve (the cross-section of the anti-deviation steel plate is smaller than the size of the sleeve's opening). Under normal circumstances, because the upper and lower platforms descend vertically, a gap is maintained between the anti-deviation steel plate and the steel sleeve. However, if a slight deviation occurs, after the inspection, the anti-deviation steel plate will tilt from a vertical position under pressure. At this point, the operator needs to readjust the center of gravity of the counterweight system and re-inspect (therefore, in this case, the anti-deviation steel plate serves as a suggestive indicator).

[0021] Furthermore, the anti-displacement steel plate also serves to prevent the loading and unloading platforms from shifting too drastically. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the static load detection mechanism in an embodiment of the present invention; Figure 3 This is a schematic diagram of the supporting anti-deviation structure in an embodiment of this utility model; Figure 4 This is a schematic diagram of the jack support structure in an embodiment of this utility model; Figure 5 This is a schematic diagram of the anti-deviation structure supported on the upper and lower load plates in an embodiment of the present invention; Figure 6 This is a schematic diagram of the anti-deviation tie rod penetrating the anti-deviation structure in an embodiment of this utility model.

[0024] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0028] Example 1: like Figure 1-6 As shown, a static load testing device for cast-in-place pile foundations in building engineering includes a static load testing mechanism 2 placed inside a foundation pit 1. Specifically, during the testing process, operators first need to open a foundation pit 1 at the pile head location of the cast-in-place pile, and then process the pile head to ensure that the pile head is flush with the bottom of the foundation pit 1.

[0029] The experimental setup was then placed into pit 1.

[0030] Specifically, the static load testing mechanism 2 includes an upper loading platform 21 and a lower loading platform 22 arranged at intervals. The lower loading platform 22 is placed on top of the pile head and keeps the pile head exactly at the geometric center of the lower loading platform 22.

[0031] In order to increase the compressive strength of the entire static load testing mechanism 2 and reduce the defects of misalignment and displacement, several support anti-misalignment structures are provided between the loading platform 21 and the unloading platform 22.

[0032] Specifically, the anti-deviation support structure serves as both a support for the steel structure frame and a means to tighten the upper platform 21 and the lower platform 22 into a unified structure for reinforcement.

[0033] Specifically, the anti-deviation support structure is arranged horizontally and parallel to the width direction of the upper platform 21 and the lower platform 22, and the anti-deviation support structure includes a support steel 27. The support steel 27 includes support parts 271 arranged on both sides (the longitudinal cross-sectional shape of the support parts is I-shaped), the support parts 271 are supported between the upper platform 21 and the lower platform 22, and also includes a connecting part 272 integrally formed between the support parts.

[0034] It also includes several anti-deviation tie rods 29 (arranged along the length of the connecting part), which tighten the upper platform 21, the support steel 27 and the lower platform 22.

[0035] Therefore, in the above structure, the support steels 27 distributed in parallel on the left and right sides and the anti-deviation tie rods 29 distributed in front and behind on each support steel 27 form a mesh-like reinforced tension structure, so as to tighten the upper platform 21, support steels 27 and lower platform 22 into an integrated reinforced structure (while if a thick steel plate is used, the weight will be very large, and it will be difficult to transport it to the construction site).

[0036] Specifically, the anti-deviation tie rod 29 includes a screw section, and the top of the screw section is integrally formed with a screw head. In order to prevent the screw head from protruding from the top surface of the upper platform 21, the top of the upper platform 21 is provided with an inner recessed groove that mates with the screw head, and the screw head is limited in the inner recessed groove.

[0037] During operation, the screw is inserted through the inner recessed groove and then through the through hole on the connecting part until it passes through the through hole on the download platform 22, after which the nut is tightened. At this point, the screw head is stopped and tightened in the inner recessed groove.

[0038] Example 2: like Figure 1-6 As shown, based on the structure of Embodiment 1, this embodiment also includes a hydraulic lifting structure installed at the top of the upper platform 21. The hydraulic lifting structure is used to lift the test weight.

[0039] Specifically, the hydraulic lifting structure includes a jack bracket 251 fixedly installed at the top of the static load testing mechanism 2, and a jack 26 is installed inside the jack bracket 251. The jack 26 is a conventional hydraulic jack for static load testing disclosed in the prior art.

[0040] The jack support 251 includes a support base (fastened by bolts) fixedly installed at the top of the static load testing mechanism 2, and the top of the support base is integrally formed with a support cylinder for limiting the installation of the jack.

[0041] At the same time, similar to the existing jacks, during the operation of the jack, the oil inlet pipe and the oil outlet pipe pass through the through hole opened on the support cylinder (not shown in the figure) and are connected to the oil tank.

[0042] Meanwhile, the hydraulic lifting structure also includes an upper support steel frame structure fixedly installed at the jacking end position; specifically, a mounting base 261 is fixedly installed at the jacking end position, and the mounting base 261 is detachably installed at the bottom of the upper support steel frame structure by bolts.

[0043] The upper supporting steel frame structure includes a frame-shaped steel beam 28 located at the center (the frame-shaped steel beam 28 has multiple weight-reducing holes), and several protruding convex arms 281 integrally formed on the left and right sides of the frame-shaped steel beam 28; the test weight is supported between the convex arms 281 (the test weight is a concrete-cast counterweight in strip shape). The convex arms 281 are thickened and reinforced steel rods.

[0044] During the test, the operator first uses a crane to lift the counterweight 4 onto the frame steel beam 28. The test counterweight 4 is stacked from left to right (first a layer of counterweight 4 is placed horizontally side by side, then a layer is laid vertically, and so on to reach the test weight).

[0045] At this point, the test weights are stacked on top of the frame steel beam 28. To increase stability, pads are placed around the top of the pit 1, supporting the bottom of the convex arm, as is done in the existing manner.

[0046] During the test, the jack lifted the frame steel beam 28 and the test weight.

[0047] Example 3: like Figure 1-6 As shown, in this embodiment, based on the structure of embodiment 2, during the test, the pressure-bearing structure formed by the static load testing mechanism 2, the supporting steel 27, and the download platform 22 is pressed down onto the pile head and the foundation pit 1, and the test data is obtained as the pile head and foundation pit 1 descend.

[0048] Therefore, in actual operation, the same as the existing detection method is used. A sensor 3 for detecting displacement, such as a displacement sensor, is installed on the static load detection mechanism 2 to detect the height of the drop of the static load detection mechanism 2, and then the magnitude of the drop of the pile head is determined.

[0049] Example 4: like Figure 1-6 As shown, based on the structure of embodiment 3, this embodiment requires that the pressure-bearing structure formed by the static load testing mechanism 2 and the download platform 22 be kept vertically descending during the testing process to avoid displacement within the pit 1. Therefore, two anti-displacement structures are installed on the front and rear side walls and the left and right side walls of the static load testing mechanism 2 and the download platform 22 respectively to prevent the static load testing mechanism 2 and the download platform 22 from sliding relative to the pit 1 (once the center of gravity of the weight block is off-center, it is easy to shift under the action of the offset force).

[0050] Specifically, the anti-deviation structure includes a steel sleeve 23 that is welded and fixed to the outer wall of the static load testing mechanism 2 and the download platform 22 respectively; the steel sleeve 23 is limited by an anti-deviation steel plate 24, and a certain distance is maintained between the anti-deviation steel plate 24 and the steel sleeve 23 (the cross section of the anti-deviation steel plate 24 is smaller than the size of the sleeve hole of the steel sleeve 23).

[0051] Meanwhile, the bottom of the anti-displacement steel plate 24 is anchored in the foundation pit 1.

[0052] Under normal circumstances, because the static load testing mechanism 2 and the download platform 22 descend vertically, the anti-displacement steel plate 24 and the steel sleeve 23 still maintain a gap. However, once there is a slight displacement, after the test is completed, the anti-displacement steel plate 24 will be tilted from a vertical position under compression. At this time, the operator needs to readjust the center of gravity of the counterweight system and retest (therefore, at this time, the anti-displacement steel plate 24 plays a suggestive and indicative role).

[0053] Furthermore, the anti-displacement steel plate 24 also serves to prevent the static load testing mechanism 2 and the download platform 22 from shifting too drastically.

[0054] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A static load test device for a cast-in-place pile foundation of a construction project, characterized in that, The system includes a static load testing mechanism placed inside the foundation pit; the static load testing mechanism includes an upper loading platform and a lower loading platform arranged at intervals, and a number of support and anti-deviation structures are arranged between the upper loading platform and the lower loading platform; the support and anti-deviation structures include support steel and a number of anti-deviation tie rods, which tighten the upper loading platform, support steel and lower loading platform. The supporting steel includes supporting parts on both sides, which are supported between the upper platform and the lower platform. It also includes a connecting part integrally formed between the supporting parts, and an anti-deviation tie rod passes through the connecting part. It also includes a hydraulic lifting structure installed at the top of the upper platform, which is used to lift the test weight.

2. The building engineering cast pile foundation static load test device according to claim 1, characterized in that, The longitudinal cross-sectional shape of the support is I-shaped.

3. The building engineering cast pile foundation static load test device according to claim 1, characterized in that, The anti-deviation tie rod includes a screw part, and the top of the screw part is integrally formed with a screw head; The top of the upper platform is provided with an inner recessed groove that mates with the screw head, and the screw head is limited within the inner recessed groove.

4. The building engineering cast pile foundation static load test device according to claim 1, characterized in that, The hydraulic lifting structure includes a jack bracket fixedly installed at the top of the upper platform, and a jack is installed inside the jack bracket.

5. The building engineering cast pile foundation static load test device according to claim 4, characterized in that, The jack support includes a support base that is fixedly installed on the top of the upper platform, and the top of the support base is integrally formed with a support cylinder for limiting and installing the jack.

6. The building engineering cast pile foundation static load test device according to claim 4, characterized in that, The hydraulic lifting structure also includes an upper support steel frame structure that is fixedly installed at the jacking end position; The jack's jacking end is fixedly equipped with a mounting base, which can be detachably installed at the bottom of the upper support steel frame structure.

7. The static load test device for cast-in-place pile foundations in building engineering according to claim 6, characterized in that, The upper support steel frame structure includes a frame-shaped steel beam located at the center, and several protruding convex arms are integrally formed on both sides of the frame-shaped steel beam. The test weight is supported between the convex arms.

8. The static load test device for cast-in-place pile foundations in building engineering according to claim 1, characterized in that, Several anti-offset structures are installed between the outer walls of the loading platform and the download platform; the anti-offset structures prevent the static load detection mechanism from moving within the pit.

9. The building engineering cast pile foundation static load test device according to claim 8, characterized in that, The anti-deviation structure includes steel sleeves that are welded and fixed to the outer walls of the upper platform and the lower platform, respectively. The steel sleeve is equipped with an anti-displacement steel plate, and the bottom of the anti-displacement steel plate is anchored in the foundation pit.

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